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    • 专利摘要:
    apparatus and method for improving secondary battery safety the present invention is for the provision of an apparatus and a method for improving the safety of a secondary battery. the apparatus for improving the safety of a secondary battery according to the present invention comprises a sensor part comprising a first sensor which is affixed to the surface of a secondary battery cell for detecting a movement of the cell, and a second sensor which is affixed to the interior of a secondary battery housing for detecting movement of the secondary battery housing for detecting movement of the housing; a piece of memory for storing a critical value for a difference between a first measured value obtained from the first sensor and a second measured value obtained from the second sensor; and a control part for calculating a difference value between the first measured value and the second measured value and comparing the calculated difference value with the critical value stored in the memory part for stopping the cell operation, when the calculated difference value is greater than the critical value. according to the present invention, it is possible to accurately detect an impact applied to the packaging of a secondary battery and stop the use of the secondary battery, when an impact is applied, thereby improving its safety, as well as reporting a fact like that to a user, for protection.
    公开号:BR112014001433B1
    申请号:R112014001433-7
    申请日:2012-08-06
    公开日:2020-07-14
    发明作者:Ho-Sang KWON；Jae- Chan Lee
    申请人:Lg Chem, Ltd；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    The present invention relates to an apparatus and a method for improving the safety of a secondary battery, and, more specifically, to an apparatus and a method for improving the safety of a secondary battery by detecting an external impact applied to a secondary battery packaging by detecting an external impact applied to a secondary battery packaging to avoid a hazard, such as an internal short circuit.
    This application claims priority for Korean Patent Application No. 10-2011-0084085 filed in the Republic of Korea on August 23, 2001 and for Korean Patent Application No. 10-2012-0085411 filed in the Republic of Korea on 3 August 2012, whose exhibits are incorporated here as a reference. PREVIOUS TECHNIQUE
    With the increase in the development and use of mobile devices, electric vehicles, hybrid vehicles, power storage devices, uninterrupted power supplies and the like, the importance of a secondary battery as a primary power source is growing. Therefore, much research has been carried out on a secondary battery satisfying various demands.
    Generally, prismatic or pouch-shaped secondary batteries are heavily demanded in terms of format, and, in terms of material, lithium-based secondary batteries are mainly used, due to their high energy density and high discharge capacity per unit of charge. time.
    In researching a secondary battery like this, improving its safety is an important aspect. Secondary lithium batteries are heated due to an internal short circuit, overload or excessive discharge, which can lead to the decomposition of an electrolyte and thermal operation, causing the pressure inside the batteries to quickly increase, thereby resulting in the batteries inevitably exploding.
    The internal short circuit causing the secondary battery to explode is generated for several reasons, including the secondary battery falling and an external impact applied there. Conventionally, the secondary battery consists of at least one unit cell, a battery management unit (BMU) and a storage housing surrounding them. Each unit cell and the BMU are connected via an electrode wire. On the electrode wire, a plurality of electrode flaps connected to each unit cell are welded. The electrode tabs extend from a thin aluminum or copper plate or are attached to it, and exhibit a very low mechanical resistance, due to their inherent characteristic.
    By the way, if the secondary battery falls or is subjected to an external impact, the unit cells sealed in the housing may move. In this case, an impact energy can focus on a connecting part between the unit cell and the BMU. Impact energy can accumulate in one connection part having poor mechanical strength among many connection parts of the secondary battery and cause the electrode flap to explode. The explosion of the electrode flap can generate an internal short circuit to cause a safety accident, such as the explosion of the secondary battery. Therefore, it is necessary to detect an external impact to protect the secondary battery.
    For this, Korean Patent No. 10-0739080 discloses an acceleration sensor equipped on a vehicle for the detection of an external impact applied to the vehicle. In this patent, when the acceleration sensor detects an impact level higher than a critical value, a large impact is considered to be applied to a secondary battery, which for the use of the secondary battery.
    However, since this previous technique only considers the acceleration variation in a vehicle, there is a limit to the control of using a secondary battery or stopping it. For example, if an impact level above a critical value is detected by an acceleration sensor, but the impact is applied to the secondary battery at a level that does not short out the battery, or, conversely, if a level of impact below a critical value is detected by an acceleration sensor, but the impact is greatly applied to the secondary battery at a level causing it to short-circuit, it will be difficult to properly protect the secondary battery. Therefore, a system for detecting an impact applied to the secondary battery only depending on the acceleration variation has low accuracy and, therefore, fails to sufficiently protect the secondary battery from external impact. EXPOSURE Technical problem
    The present invention is designed to solve the problems of the prior art, and therefore it is an objective of the present invention to provide an apparatus and a method for improving the safety of a secondary battery from an extraordinary impact by more accurately detecting an impact applied to the secondary battery. Technical Solution
    In order to achieve the aforementioned objective, in accordance with an aspect of the present invention, an apparatus is provided for improving the safety of a secondary battery, comprising: a sensor part comprising a first sensor which is affixed to the surface of a secondary battery cell for detecting movement of the cell, and a second sensor which is affixed to the interior of a secondary battery housing for detecting movement of the housing; a memory portion for storing a critical value for a difference between a first measured value obtained from the first sensor and a second measured value obtained from the second sensor; and a control part for calculating a difference value between the first measured value and the second measured value and for comparing the calculated difference value with the critical value stored in the memory part for stopping the cell operation, when the calculated difference value is greater than the critical value.
    In accordance with another aspect of the present invention, a method is provided for improving the safety of a secondary battery, comprising: (a) storing a critical value for a difference between a first measurement value obtained from a first sensor and a second measurement value obtained from a second sensor in a memory part, the first sensor being affixed to the surface of a secondary battery cell to detect cell movement, and the second sensor being affixed to the inside a secondary battery housing for detecting movement of the housing; (b) storing the first measured value obtained from the first sensor; (c) storing the second measured value obtained from the second sensor; (d) calculating a difference value between the first measured value and the second measured value; and (e) stopping the operation of the cell, when the calculated difference value is greater than the critical value stored in the memory part. Advantageous Effects
    According to one aspect of the present invention, it is possible to accurately detect an impact applied to a secondary battery.
    According to another aspect of the present invention, when a secondary battery is subjected to an impact, it is possible to stop using the secondary battery to improve its safety.
    According to another aspect of the present invention, when a secondary battery is subjected to an impact, it is possible to report this fact to a user for protection and induction of repair of the secondary battery at an appropriate time. DESCRIPTION OF THE DRAWINGS
    The associated drawings illustrate a preferred embodiment of the present invention and, in conjunction with the foregoing, serve to provide an additional understanding of the technical spirit of the present invention. However, the present invention is not to be construed as being limited to the drawings.
    Figure 1 is a block diagram showing schematically the configuration of an apparatus for improving the safety of a secondary battery according to an embodiment of the present invention.
    Figure 2 shows the configuration of a conventional geomagnetic sensor.
    Figure 3 shows magnetic lines of force generated in a core, when a current flows in an excitation coil.
    Figure 4 shows an electromotive force generated in each coil of the x and y axes by magnetic lines of force generated in a core.
    Figure 5 shows the state of geomagnetic sensors before an impact is applied there, the geomagnetic sensors being independently affixed, each, to the cell surface of a secondary battery and to the interior of its housing.
    Figure 6 shows the state of geomagnetic sensors, after an impact is applied there, the geomagnetic sensors being independently affixed, each, to the cell surface of a secondary battery and to the interior of its housing.
    Figure 7 is a conceptual diagram showing schematically the configuration of a pendulum acceleration sensor.
    Figure 8 is a conceptual diagram showing schematically the configuration of a vibration acceleration sensor.
    Figure 9 is a perspective view showing a bimorph piezoelectric element which is an example of an inertial acceleration sensor.
    Figure 10 is a cross-sectional view of a longitudinal acceleration sensor using the bimorphic piezoelectric element of figure 9.
    Figure 11 shows the state of acceleration sensors before an impact is applied there, the acceleration sensors being independently affixed, each, to the cell surface of a secondary battery and to the interior of its housing.
    Figure 12 shows the state of the acceleration sensors after an impact is applied there, the acceleration sensors being independently affixed, each, to the cell surface of a secondary battery and to the interior of its storage housing.
    Figure 13 illustrates a front view and a side view of a vibrating gyrosensor to explain its operation.
    Figure 14 shows the state of gyrosensors before an impact is applied there, the acceleration sensors being independently affixed, each, to the cell surface of a secondary battery and to the interior of its housing.
    Figure 15 shows the state of gyrosensors after an impact is applied there, the acceleration sensors being independently affixed, each, to the cell surface of a secondary battery and to the interior of its housing.
    Figure 16 is a flow chart showing the procedures of a method for improving the safety of a secondary battery according to an embodiment of the present invention. BEST MODE
    From this point on, the preferred embodiments of the present invention will be described in detail with reference to the associated drawings. Before describing, it should be understood that the terms used in the specification and in the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to the technical aspects of the present invention based on the principle that the inventor is allowed to define terms appropriately for the best explanation. Therefore, the description proposed here is only a preferable example for the purpose of illustration only, not intended to limit the scope of the exhibition, so it should be understood that other equivalents and modifications could be made, without deviating from the spirit and scope of the exhibition.
    Figure 1 is a block diagram showing schematically the configuration of an apparatus for improving the safety of a secondary battery according to an embodiment of the present invention.
    With reference to figure 1, the apparatus for improving the safety of a secondary battery according to the present invention comprises a sensor part 130, a control part 140 and a memory part 150. As shown in figure 1, a cell 110 A secondary battery comprises at least one unit cell and is not limited to its type. For example, the secondary battery cell 110 may be a lithium ion battery, a lithium metal battery, a lithium polymer battery, a nickel-cadmium battery, a nickel-hydrogen battery, a nickel battery -zinc or a lead storage battery. In addition, the secondary battery cell 100 includes any cell that can be easily applied by a person having common knowledge in the art.
    Secondary battery cell 100 is selectively connected to a charge or charger for discharging or charging. The charge is not particularly limited to its type, but examples of it may include a video camera, a mobile phone, a portable electronics, such as a portable PC, a PMP and an MP3 player, an electric vehicle engine or a hybrid vehicle, and a DC-DC converter.
    The sensor part 130 comprises a first sensor 132 and a second sensor 134. The first sensor 132 is affixed to the surface of the secondary battery cell 110 to detect movement of the secondary battery cell 110. The second sensor 134 is affixed to the inside a secondary battery housing 120 for detecting movement of the housing 120. Thus, the first sensor 132 and the second sensor 134 are affixed to the surface of the secondary battery cell 110 and to the interior of the housing secondary battery 120, respectively, for the purpose of detecting the individual movement of the secondary battery cell 110 and the secondary battery housing 120. From this point, for convenience of explanation, a measurement value obtained from the first sensor 132 is called a first measured value, and a measured value obtained from the second sensor 134 is a second me value dition. The first and second measurement values are periodically measured and stored during charging or discharging the secondary battery, but the present invention is not limited to this.
    The memory part 150 stores a critical value for a difference between the first measured value obtained from the first sensor 132 and the second measured value obtained from the second sensor 134. The critical value refers to a reference value for determining whether a movement detected in the sensor part 130, i.e., an impact applied to the secondary battery 100, is a level which can cause a safety problem. The critical value can be determined, depending on various specifications of the secondary battery, including the material of a flap used in the secondary battery cell 100, the size and structure of the secondary battery cell 100, and the material and structure of the battery housing. secondary battery packaging 120, as well as the usage environment of secondary battery 100. In other words, the critical value is determined by the manufacturer of a secondary battery, and although the same secondary battery 100 is used, the critical value can be optionally set to a lower or higher numerical value.
    The memory portion 150 can be a volume storage medium, for example, semiconductor devices known to be capable of writing or removing data, such as RAM, ROM, EEPROM and flash memory, and a hard disk, but the present invention is not limited to this.
    Control part 140 calculates a difference value between the first measured value and the second measured value. The difference value refers to a difference between the first measured value and the second measured value, and is expressed by the following equation (I):
    Difference = | first measured value - second measured value | (I)
    In the present invention, when an impact is applied to the secondary battery 100, the occurrence of a safety problem is determined, depending on a relative difference between each movement of the secondary battery cell 110 and the secondary battery housing 120. Thus , the difference value is calculated as the absolute value of a difference between the measured values. That is, the difference value means a relative extent of impact transmitted to the first sensor 132 and the second sensor 134.
    Also, control part 140 compares the calculated difference value with the critical value to check whether an impact applied to the secondary battery 100 is greater than the predetermined critical value. When the difference value is not greater than the critical value, the impact applied to the secondary battery 100 is greater than the predetermined critical value. When the difference value is not greater than the critical value, the impact applied to the secondary battery 100 is considered weak, or, if a strong impact is applied, it will not be sufficient to cause the secondary battery cell to deform or rupture 110. When the difference value is greater than the critical value, the secondary battery cell 110 is considered to be moving in the secondary battery housing 120 by an impact applied to the secondary battery 100, from that of the secondary cell. secondary battery 110 may be deformed or ruptured.
    In addition, when the calculated difference value is greater than the critical value, the control part 140 cuts off a power switch 160 of the secondary battery cell 110 to stop charging or discharging the secondary battery. That is, when checking for the occurrence of a safety problem, the control part 140 for the use of the secondary battery, thereby preventing safety accidents, such as an explosion.
    According to an embodiment of the present invention, the first sensor 132 and the second sensor 134 of the sensor part 130 are a geomagnetic sensor, which detects the Earth's magnetic fields to find the direction of an object. From this point on, a principle for detecting an impact applied to the secondary battery 100 by means of the geomagnetic sensor will be explained.
    Figure 2 shows the configuration of a conventional geomagnetic sensor.
    With reference to figure 2, the geomagnetic sensor comprises a core 200 which is a permalloy magnetic body in the shape of a ring, an excitation coil 210 wound around the vicinity of the core 200, and the coil X 220 and the coil Y 230 which are detection coils. The coil X 220 and coil Y 230 are orthogonal to each other in a diametrical direction of the core 200 and independently wound.
    Figure 3 shows magnetic lines of force generated in the core 200, when a current flows in the excitation coil 210.
    With reference to figure 3, when an excitation occurs by an alternating current which flows in the excitation coil 210, the magnetic lines of force are generated in the direction of an arrow inside the core 200. The core 200 cannot have a magnetic pole due to to its ring shape.
    Figure 4 shows an electromotive force generated in each coil of the X 220 axis and the Y axis 230 by magnetic lines of the force generated in the core 200.
    With reference to figure 4, although the electromotive force is generated on the x 220 axis and on the y 230 axis depending on the variation of a magnetic flux, the magnetic lines of force travel in each device among ('!. ■ and @, and in each of @ and (4), so that there is no output on the x 220 axis and on the y 230 axis. At this moment, when an external magnetic field is applied to the geomagnetic sensor, an output is generated on the x 220 axis and in the y-axis 230. For example, if an external magnetic field is applied in a direction parallel to the y-230 axis, the maximum voltage will be generated in the x 220 axis, while if an external magnetic field is applied in a 45 ° direction with the axis y 230, half of the peak voltage will be generated in each of the x 220 axis and the y 230 axis. That is, the external magnetic field becomes a geomagnetic field, and the direction of the geomagnetic sensor based on the geomagnetic field can be detected by a difference between voltages generated in each one between the x 220 axis and the y axis 230.
    Figures 5 and 6 are conceptual views showing a method for detecting an impact applied to the secondary battery 100 by the use of two geomagnetic sensors.
    Figure 5 shows the state of geomagnetic sensors before an impact is applied there, the geomagnetic sensors being independently attached each to the surface of the secondary battery cell 110 and to the interior of the secondary battery housing 120.
    With reference to figure 5, each of the first sensor 132 and the second sensor 134 acts as a geomagnetic sensor and detects direction using a geomagnetic field. A direction (0J with respect to the geomagnetic field detected by the first sensor 132 corresponds to a first measured value, while a direction (02) with respect to the geomagnetic field detected by the second sensor 134 corresponds to a second measured value. If the impact is applied, a difference between measurement values obtained from two sensors is not greater than a critical value.
    Figure 6 shows the state of geomagnetic sensors after an impact strong enough to cause the deformation applied there, the geomagnetic sensors being independently affixed, each, to the surface of the secondary battery cell 110 and to the interior of the secondary battery housing 120.
    Referring to figure 6, the first sensor 132 and the second sensor 134 detect the change in position of the secondary battery cell 110 and the secondary battery housing 120, respectively, due to the strong impact. At this time, a direction (9i ') with respect to the geomagnetic field detected by the first sensor 132 corresponds to a first measurement value, while a direction (02') with respect to the geomagnetic field detected by the second sensor 134 corresponds to a second value of measurement. When an impact is weak, or a strong impact is applied, but causes very little movement of the secondary battery cell 110 and secondary battery housing 120, a difference between the first measured value and the second measured value is not greater than a critical value. However, when a strong impact is applied to cause the secondary battery cell 110 to move in the secondary battery housing 120, so that the secondary battery cell 110 can be deformed or broken, a difference between the first measured value and the second measured value is greater than a critical value. Therefore, when a difference between the first measured value and the second measured value is greater than a critical value, the control part 140 cuts off the power switch 160 from discharging the secondary battery 100.
    Although figures 5 and 6 illustrate a mode in which two geomagnetic sensors detect an impact on only one axis, an impact applied to the secondary battery 100 can be in a direction transverse to a plane, as well as a longitudinal and a vertical direction. Therefore, the first sensor 132 and the second sensor 134 are a geomagnetic sensor which detects two or more directions between two axes consisting of rolling, pitching and yaw angles.
    In the present invention, it is preferred that the inner axis of the first sensor 132 is consistent with the inner axis of the second sensor 134. With reference to figure 2, the geomagnetic sensor measures an angle that is formed by the coil X 220 and the bobbin Y 230 in together with a geomagnetic field. When the first sensor 132 and the second sensor 134 are attached so that the coil X 220 of the first sensor 132 has the same direction as that of the second sensor 134, while the coil Y 230 of the second sensor 134 has the same direction as that of the According to sensor 134, a difference value can be calculated more accurately.
    According to another aspect of the present invention, the first sensor and the second sensor can be an acceleration sensor, which detects the presence and extent of acceleration applied to an object.
    The acceleration sensor can be divided into an inertial, pendulum and vibration sensor, depending on a way of detecting the state of movement of an object.
    Figure 7 is a conceptual diagram showing schematically the configuration of a pendulum acceleration sensor.
    With reference to figure 7, a pendulum is supported by a pivot bearing having a friction. When an acceleration a is applied to the pendulum in any direction, the pendulum is moved in the opposite direction and a degree of displacement is measured by an automatic transformer. The automatic transformer extracts a voltage in proportion to the size of the acceleration, and the output voltage is used to determine the direction and extent of the acceleration.
    Figure 8 is a conceptual diagram showing schematically the configuration of a vibration acceleration sensor.
    With reference to figure 8, an optional mass m is supported on both sides by chains. When an acceleration a is applied to the mass m in any direction, a vibration occurs in the currents by traction of the currents. At this time, the frequencies of the currents are different from each other by the extent of acceleration, in which the frequencies of the currents, fl and f2 are measured, each, to determine the extent of acceleration of a difference between them.
    The inertial acceleration sensor is used to measure an inertial acceleration based on a static system, which uses a force that arises from the acceleration that acts on a mass, that is, an inertial force. The inertial acceleration sensor is varied, depending on an inertia measurement method. For example, a piezoelectric element can be used as an example, which can be explained by its fundamental principle in conjunction with a method for detecting impact applied to the secondary battery 100 by using it below.
    Figure 9 is a perspective view showing a piezoelectric element which is an example of an inertial acceleration sensor.
    With reference to figure 9, a piezoelectric vibrator 300 comprises, as a piezoelectric element, a bimorphic piezoelectric element 310, which is formed by the adhesion of sheets made of a piezoelectric material, such as piezoelectric ceramic sheets 320, to each other. The term "piezoelectric element" which is used here refers to a substance having a 'piezoelectric effect' capable of generating a current when applying force to a piezoelectric body. The piezoelectric body can be made of lead zirconate titanate (PZT), barium titanate, a quartz plate, tartaric acid, ammonium dihydrogen phosphate or ethylenediamine tartrate. Each of the electrodes 340 is connected to main planes opposite to each piezoelectric ceramic sheet 320. In the center of the piezoelectric element 310, projections are formed linearly on the electrode 340.
    In order to effectively generate a flexible vibration (flexion vibration), it is preferable that the length of the piezoelectric vibrator is at least 3.5 times, more preferably 5 times greater than its width. The projections 330 are preferably formed near the center of the bimorphic piezoelectric element 310 in the longitudinal direction of the same and arranged symmetrically with respect to the center line in the transverse direction. When formed near the center of the piezoelectric vibrator 300 in the transverse direction, the number and arrangement of the linear projections 330 can be varied in two opposing main planes of the bimorphic piezoelectric element 310, but it is preferred to have the same number and arrangement in two opposite main planes.
    Figure 10 is a cross-sectional view of a longitudinal acceleration sensor using the bimorphic piezoelectric element of figure 9.
    With reference to figure 10, the bimorphic piezoelectric element 310 is inserted between a convex portion 350 which is formed inside the top of a package and an elastic support member 360 in the projections 330 formed in the bimorphic piezoelectric element 310 to be supported in the package ( Support). The elastic support member 360 applies constant pressure to the bimorphic piezoelectric element 310 to fully support the bimorphic piezoelectric element, which is supported in the central part. The pressure applied to the bimorphic piezoelectric element 310 is determined, depending on the degree of impact to be extracted, the resistance of the bimorphic piezoelectric element 310 and the sensitivity of the bimorphic piezoelectric element 310 to acceleration.
    When an acceleration having a vertical component is applied to the acceleration sensor shown in figure 10, a load is added to the central part of the bimorphic piezoelectric element 310, which is supported by the elastic support member 360, for distortion of the bimorphic piezoelectric element 310. The piezoelectric effect of the bimorphic piezoelectric element 310 is for generating a current in the distorted bimorphic piezoelectric element 310.
    The current generated in this way is extracted through electrodes 340. The amount of current to be generated is proportional to a degree of distortion, that is, the extent of acceleration extracted outside, and therefore the extent of acceleration can be measured from the amount of the chain.
    Figures 11 and 12 are conceptual views showing a method for detecting an impact applied to the secondary battery 100 by using two acceleration sensors.
    Figure 11 shows the state of acceleration sensors before an impact is applied there, the acceleration sensors being independently attached each to the surface of the secondary battery cell 110 and to the interior of the secondary battery housing 120.
    With reference to figure 11, each of the first sensor 132 and the second sensor 134 detects the acceleration variation. A voltage (VJ with respect to the acceleration extension detected by the first sensor 132 corresponds to a first measured value, while a voltage (V2) with respect to the acceleration extension detected by the second sensor 134 corresponds to a second measured value. , before an impact is applied, a difference between measured values obtained from two sensors is not greater than a critical value.
    Figure 12 shows the state of acceleration sensors after an impact strong enough to cause deformation or rupture of the secondary battery cell 110 to be applied there, each of the acceleration sensors being independently affixed to the surface of the secondary battery cell 110 and the interior of the secondary battery storage housing 120.
    Referring to figure 12, the first sensor 132 and the second sensor 134 detect the change in position of the secondary battery cell 110 and the secondary battery housing 120, respectively, due to a strong impact. At this time, an extension (Vi ') detected by the first sensor 132 corresponds to a first measured value, while an acceleration extension (V2 *) detected by the second sensor 134 corresponds to a second measured value. When an impact is weak, or a strong impact is applied, but causes very little movement of the secondary battery cell 110 and secondary battery housing 120, a difference between the first measured value and the second measured value is not greater than a critical value. However, when a strong impact is applied to cause movement of the secondary battery cell 110 in the secondary battery housing 120, so that the secondary battery cell 110 can be deformed or ruptured, a difference between the first measured value and the second measured value is greater than a critical value. Therefore, when a difference between the first measured value and the second measured value is greater than a critical value, the control part 140 cuts off the power switch 160 of the secondary battery 100 to stop charging or discharging the battery. secondary 100.
    According to another embodiment of the present invention, each of the first sensor 132 and the second sensor 134 can be a gyrosensor, which detects the variation of a moment by a rotating force in an airplane, a ship, a vehicle, a camcorder and the like. In accordance with the present invention, a method for detecting an impact applied to the secondary battery 100 will be explained below.
    Figure 13 illustrates a front view and a side view of a vibrating gyrosensor to explain its operation.
    The view (a) of figure 13 is for a front view of the vibrating gyrosensor, and the view (b) of figure 13 is a side view of it. Referring to figure 13, the vibrating gyrosensor comprises an oscillator 430. Oscillator 430 is placed on a concave-convex semicircular support 410 formed on a substrate 460. Oscillator 430 is a cylindrical vibrator which is a piezoelectric body that has an effect piezoelectric. A support member 410 is configured to accelerate the resonance mode of silicon nodes 420 to support oscillator 430 which vibrates. The support member 410 is electrically connected via an electrical wire 450 to an electrode 440 which is equipped on the side of the oscillator 430.
    The gyrosensor having a configuration like this generates vibration on the x or y axis in three dimensions consisting of the x, y and z axes, by applying a voltage to the electrode 440, which is connected to the support member 410. When a rotary angular speed is applied in a circumferential direction on the z axis, the Coriolis force is generated.
    The Coriolis force is a fictitious force used to explain an deflection of movement of an object, when it is seen in a rotating frame of reference, as an apparent force similar to a centrifugal force, and its extension is proportional to the speed of rotation. of an object and acts vertically in a direction of movement.
    Therefore, when a rotary angular velocity is applied, the Coriolis force is generated on the y axis, if the oscillator 430 vibrates on the x axis, while the Coriolis force is generated on the x axis, if the oscillator 430 vibrates on the axis. y. The generated force is detected at the electrode 440 of the cylindrical oscillator 430 and generates a voltage proportional to the Coriolis force. Therefore, it is possible to detect the variation of a direction of movement applied to oscillator 430, thereby determining a change in position.
    Figures 14 and 15 are conceptual views showing a method for detecting an impact applied to the secondary battery 100 by the use of two gyrosensors.
    Figure 14 shows the state of gyrosensors before an impact is applied there, each of the gyrosensors being independently affixed to the surface of the secondary battery cell 110 and to the interior of the secondary battery housing 120.
    With reference to figure 14, each of the first sensor 132 and the second sensor 134 detects the direction of a movement applied to oscillator 430. A voltage (Vi) with respect to the direction of movement detected by the first sensor 132 corresponds to a first value measurement, while a voltage (V2) with respect to the direction of movement detected by the second sensor 134 corresponds to a second measurement value. Therefore, before an impact is applied, a difference between measured values is not greater than a critical value.
    Figure 15 shows the state of gyrosensors after an impact strong enough to cause deformation or rupture of the secondary battery cell 110 to be applied there, each of the gyrosensors being independently affixed to the surface of the secondary battery cell 110 and to the interior of the secondary battery storage housing 120.
    Referring to figure 15, the first sensor 132 and the second sensor 134 detect the change in position of the secondary battery cell 110 and the secondary battery housing 120, respectively, due to a strong impact. At this time, an extension of a direction of movement (Vi ') detected by the first sensor 132 corresponds to a first measured value, while an extension of a direction of movement (V2 *) detected by the second sensor 134 corresponds to a second value of measurement. When an impact is weak, or a strong impact is applied, but causes very little movement of the secondary battery cell 110 and secondary battery housing 120, a difference between the first measured value and the second measured value is not greater than a critical value. However, when a strong impact is applied to cause movement of the secondary battery cell 110 in the secondary battery housing 120, so that the secondary battery cell 110 can be deformed or ruptured, a difference between the first measured value and the second measured value is greater than a critical value. Therefore, when a difference between the first measured value and the second measured value is greater than a critical value, the control part 140 cuts off the power switch 160 of the secondary battery 100 to stop charging or discharging the battery. secondary 100.
    The various sensors mentioned above are provided for the purpose of illustration only. Accordingly, it will be apparent to a person having common knowledge in the art that other various sensors can be used in the present invention.
    Preferably, the apparatus for improving the safety of a secondary battery according to the present invention further comprises a warning part to report a failure of the secondary battery to a user, when the calculated difference value is greater than the critical value.
    The warning part informs a user that an impact greater than a critical level is applied to the secondary battery 100, from which the user can stop using the secondary battery 100 or repair the battery.
    The warning part can be in the form of a lamp, an LED, a horn or a loudspeaker. For example, in the case of vehicles, a user can confirm a warning from a display to inform the status and driving information of the vehicles, if desired, together with a horn or a loudspeaker which is a acoustic warning, but the present invention is not limited to this.
    According to an embodiment of the present invention, the control part 140 can be a microprocessor. In this case, the components of the control part 140 can be implemented as a program module. The program module operates by program instructions via a computer and is written to a medium that can be read on a computer.
    The computer-readable medium may comprise a program instruction, a data file, a data structure or a combination thereof. The program instruction recorded in the middle can be designed and configured in particular for the present invention, or it can be known in a field of computer programming.
    The computer-readable recording medium comprises memory part 150. Also, the computer-readable recording medium comprises magnetic means, such as a hard disk, a floppy disk and a magnetic tape, optical means, such as CD-ROM and DVD, magnetic-optical media, such as an optical floppy disk and hardware devices, such as a ROM, RAM and flash memory, for the storage and execution of program instructions.
    Examples of the program instruction include a machine language code which is produced by a compiler, as well as a high level language code, which can be run by an interpreter via a computer.
    According to another embodiment of the present invention, the components of the control part 140 can be implanted as an electronic circuit module comprising a logic circuit. An example of the electronic circuit module may be an application-specific integrated circuit (ASIC), but the present invention is not limited to this.
    The control part 140 and the memory part 150 can be arranged inside the secondary battery pack, as shown in figure 1, but the present invention is not limited to this. The control part 140 and the memory part 150 can also be arranged outside the secondary battery pack, and, if necessary, the control part 140 or the memory part 150 can be disposed within the secondary battery pack. Thus, the control part 140 and the memory part 150 can be arranged inside or outside the secondary battery box, depending on the mode of implementation of the present invention.
    The apparatus for improving the safety of a secondary battery according to the present invention can be used in a battery conditioning drive unit in which the power is supplied from a secondary battery.
    For example, the apparatus of the present invention can be used in various power units equipped with a battery, such as vehicles using fossil fuel, electric vehicles, hybrid vehicles and electric bicycles.
    Also, the apparatus of the present invention can be used in various electronic products supplied with a drive voltage from a battery, for example, notebooks, mobile phones and personal multimedia regenerators, but the present invention is not limited to this.
    Furthermore, the apparatus for improving the safety of a secondary battery according to the present invention can be modularized as a PCB circuit or an application-specific integrated circuit (ASIC) to be used in a battery or a battery management unit .
    In accordance with another aspect of the present invention, the present invention further provides a method for improving the safety of a secondary battery, which is implemented by the apparatus mentioned above for improving the safety of a secondary battery, which will be explained below. For components or terms which are already specifically explained above, a repetitive explanation will be omitted.
    Figure 16 is a flow chart showing the procedures of a method for improving the safety of a secondary battery according to an embodiment of the present invention.
    First, in step S510, the control part 140 stores a critical value for a difference between a first measured value obtained from the first sensor 132 and a second measured value obtained from the second sensor 134 in the memory part 150, the first sensor being affixed to the surface of the secondary battery cell 110 for detecting a movement of the secondary battery cell 110, and the second sensor being affixed to the inside of the secondary battery housing 120 for detecting a movement secondary battery housing 120. Then, in step S520, control part 140 stores the first measured value obtained from the first sensor 132 in memory part 150. Then, in step S530, the control part 140 stores the second measured value obtained from the second sensor 134 in the memory part 150. The first and second measured values are periodically measured and stored during before charging or discharging the secondary battery, but the present invention is not limited to this. The first sensor 132 and the second sensor 134 can be any one selected from a geomagnetic sensor, an acceleration sensor (for example, an inertial, pendulum or vibration sensor) and a gyrosensor. Subsequently, in step S540, the control part 140 calculates a difference value between the first measured value and the second measured value. Then, in step S550, control part 140 determines whether the calculated difference value is greater than the critical value stored in memory part 150 or not. When the difference value is not greater than the critical value, an impact applied to the secondary battery 100 is considered weak or absent, thus returning to step S520 for the process of the next impact detection cycle. Conversely, when the difference value is greater than the critical value, a safety problem occurs due to an impact applied to the secondary battery 100, thereby progressing to step S560. In step S560, control part 140 determines that the secondary battery cell is highly likely to be deformed or ruptured by an impact applied to the secondary battery, and thus cuts a power switch 160 of the secondary battery cell 110 to stop charging or discharging the secondary battery.
    Preferably, in step S550, if the difference value is greater than the critical value, an additional step, that is, step S570, can be progressed through control part 140. That is, in step S570, the control part 140 visually or acoustically informs the user of the occurrence of a safety problem in the secondary battery.
    Thus, according to the present invention, it is possible to accurately detect an impact applied to the secondary battery. In addition, when an impact is applied to the secondary battery 100, the use of the secondary battery is stopped, to improve its safety. Furthermore, when an impact is applied to the secondary battery 100, a fact like this is reported to a user, thereby protecting the user and inducing the repair of the secondary battery at an appropriate time.
    By the way, each component for the apparatus for improving the safety of a secondary battery according to the present invention shown in figure 1 should be understood as a logically distinguished component, rather than a physically distinguished component.
    In other words, each component corresponds to a logically distinguished element for the realization of the spirit of the present invention, and should be understood as being included in the scope of the present invention, if it can perform its logical function, although it is separately implemented or integrated with another one. component, and components performing the same or similar functions are to be understood as being within the scope of the present invention, although their designations are different. INDUSTRIAL APPLICABILITY
    The present invention has been described in detail by specific modalities and drawings. However, it should be understood that the specific modalities and drawings are given by way of illustration only, and are not intended to limit the present invention, and thus the various changes and modifications can be made by those skilled in the art in the invention, the which also fall within the scope of the invention, as defined as the appended claims.
    权利要求:
    Claims (18)
    [0001]
    1. Apparatus for improving the safety of a secondary battery (100), characterized by the fact that it comprises: a secondary battery (100), and a housing (120) for the secondary battery (100), a sensor part (130) comprising a first sensor (132) which is affixed to the surface of a cell (110) of the secondary battery (100) for detecting movement of the cell (110), and a second sensor (134) which is attached to the inside the housing (120) of the secondary battery (100) for detecting a movement of the housing (120); a memory portion (150) for storing a critical value for a difference between a first measured value obtained from the first sensor (132) and a second measured value obtained from the second sensor (134); and a control part (140) for calculating a difference value between the first measured value and the second measured value and for comparing the calculated difference value with the critical value stored in the memory part (150) for stopping operation of the cell (110), when the calculated difference value is greater than the critical value, in which the control part (140) and the memory part (150) can be arranged inside or outside the secondary battery packaging , and when the calculated difference value is greater than the critical value, the control part (140) cuts off the cell power switch (110) of the secondary battery (100) to stop the charging or discharging of the secondary battery (100) ).
    [0002]
    2. Apparatus for improving the safety of a secondary battery, according to claim 1, characterized in that the first sensor (132) and the second sensor (134) are each geomagnetic sensor.
    [0003]
    3. Device for improving the safety of a secondary battery, according to claim 2, characterized in that the first sensor (132) and the second sensor (134) have at least one axis for measuring an angle formed with the line of geomagnetic field.
    [0004]
    4. Apparatus for improving the safety of a secondary battery, according to claim 2, characterized by the fact that the geomagnetic sensor comprises a core (200) which is a permalloy magnetic body in the shape of a ring, an excitation coil ( 210) wound around the core (200), and coil X (220) and coil Y (230) which are detection coils, where coil X (220) and coil Y (230) are orthogonal to each other in a diametrical direction of the core (200) and independently coiled, where the first sensor (132) and the second sensor (134) are attached so that the coil X (220) of the first sensor (132) has the same direction as that of the second sensor (134), while the Y coil (230) of the first sensor (132) has the same direction as that of the second sensor.
    [0005]
    5. Apparatus for improving the safety of a secondary battery, according to claim 1, characterized in that the first sensor (132) and the second sensor (134) are each acceleration sensor.
    [0006]
    6. Apparatus for improving the safety of a secondary battery, according to claim 5, characterized by the fact that the acceleration sensor is an inertial, pendulum or vibration sensor.
    [0007]
    7. Apparatus for improving the safety of a secondary battery, according to claim 6, characterized by the fact that the inertial acceleration sensor is a piezoelectric element.
    [0008]
    8. Apparatus for improving the safety of a secondary battery, according to claim 1, characterized in that the first sensor (132) and the second sensor (134) are each gyrosensor.
    [0009]
    9. Apparatus for improving the safety of a secondary battery, according to any one of claims 1 to 8, characterized by the fact that it still comprises a warning part to report a failure of the secondary battery (100) to a user, when the value difference calculated is greater than the critical value.
    [0010]
    10. Method for improving the safety of a secondary battery using an apparatus for improving the safety of a secondary battery (100), as defined in claim 1, characterized by the fact that it comprises: (a) the storage of a critical value for a difference between a first measured value obtained from a first sensor (132) and a second measured value obtained from a second sensor (134) in a memory part (150), the first sensor being affixed to the surface of a secondary battery cell for detecting a movement of the cell, and the second sensor being affixed to the inside of a housing (120) of the secondary battery for detecting a movement of the housing; (b) storing the first measured value obtained from the first sensor; (c) storing the second measured value obtained from the second sensor; (d) calculating a difference value between the first measured value and the second measured value; and (e) stopping the operation of the cell, when the calculated difference value is greater than the critical value stored in the memory part.
    [0011]
    11. Method for improving the safety of a secondary battery, according to claim 10, characterized in that the first sensor and the second sensor are each geomagnetic sensor.
    [0012]
    12. Method for improving the safety of a secondary battery, according to claim 11, characterized in that the first sensor and the second sensor have at least one axis for measuring an angle formed with the geomagnetic field line.
    [0013]
    13. Method for improving the safety of a secondary battery, according to claim 11, characterized in that the geomagnetic sensor comprises a core (200) which is a permalloy magnetic body in the shape of a ring, an excitation coil (210) wound along the vicinity of the core (200), and coil X (220) and coil Y (230) which are detection coils, wherein coil X (220) and coil Y (230) are orthogonal to each other in a diametrical direction of the core (200) and independently rolled up, in which the first sensor (132) and the second sensor (134) are attached so that the coil X (220) of the first sensor (132) has the same direction as that of the second sensor (134), while the coil Y (230) of the first sensor (132) has the same direction as that of the second sensor.
    [0014]
    14. Method for improving the safety of a secondary battery, according to claim 10, characterized in that the first sensor and the second sensor are each acceleration sensor.
    [0015]
    15. Method for improving the safety of a secondary battery, according to claim 14, characterized by the fact that the acceleration sensor is an inertial, pendulum or vibration sensor.
    [0016]
    16. Method for improving the safety of a secondary battery, according to claim 15, characterized by the fact that the inertial acceleration sensor is a piezoelectric element.
    [0017]
    17. Method for improving the safety of a secondary battery, according to claim 10, characterized in that the first sensor and the second sensor are each gyrosensor.
    [0018]
    18. Method for improving the safety of a secondary battery, according to any of claims 10 to 17, characterized by the fact that it still comprises a warning of a secondary battery failure to a user, when the calculated difference value is greater than that critical value.
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    同族专利:
    公开号 | 公开日
    WO2013027945A3|2013-05-10|
    KR101283486B1|2013-07-12|
    US9496543B2|2016-11-15|
    JP5954844B2|2016-07-20|
    EP2725651B1|2017-04-05|
    CN103733419A|2014-04-16|
    CN103733419B|2016-08-10|
    BR112014001433B8|2020-08-04|
    TW201329454A|2013-07-16|
    KR20130023073A|2013-03-07|
    TWI463139B|2014-12-01|
    US20130295419A1|2013-11-07|
    EP2725651A4|2015-03-04|
    JP2014529856A|2014-11-13|
    EP2725651A2|2014-04-30|
    WO2013027945A2|2013-02-28|
    BR112014001433A2|2017-02-21|
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    法律状态:
    2019-08-06| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-06-02| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-07-14| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 06/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    2020-08-04| B16C| Correction of notification of the grant|Free format text: REF. RPI 2584 DE 14/07/2020 QUANTO AO ENDERECO. |
    优先权:
    申请号 | 申请日 | 专利标题
    KR10-2011-0084085|2011-08-23|
    KR20110084085|2011-08-23|
    KR10-2012-0085411|2012-08-03|
    KR1020120085411A|KR101283486B1|2011-08-23|2012-08-03|Apparatus and method for enhancing of second battery safety|
    PCT/KR2012/006239|WO2013027945A2|2011-08-23|2012-08-06|Device for improving stability of secondary battery and method thereof|
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