• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 优先权
    • 专利摘要:
    The method for determining a health status indicator (SOH) of a lithium battery of the invention comprises a step (E3) of delay during a relaxation phase of the battery voltage after a discharge phase , or of charging, of the battery, a step (E4) of measuring a battery voltage after relaxation at a time tn end of delay, and a step (E5) of calculating the status indicator of health of the battery at time tn from the voltage after relaxation (OCVtn) measured at time tn and a voltage after relaxation of the battery (OCVto) measured at the beginning of battery life.
    公开号:FR3041764A1
    申请号:FR1559007
    申请日:2015-09-24
    公开日:2017-03-31
    发明作者:Akram Eddahech
    申请人:Commissariat a lEnergie Atomique CEA；Commissariat a lEnergie Atomique et aux Energies Alternatives CEA；
    IPC主号:
    专利说明:

    Title: Method and device for determining a health status indicator of a lithium battery
    TECHNICAL FIELD OF THE INVENTION The invention relates to a method for determining a health status indicator of a lithium battery, in particular a lithium-ion battery, and an associated device. It also relates to a control system of a lithium battery incorporating such a device and a motor vehicle or hybrid and a nomadic device equipped with this control system. State of the art
    Lithium batteries or accumulators, in particular lithium-ion, lithium-ion-polymer or lithium-metal-polymer batteries, are widely used in the automotive field for the supply of electric or hybrid motor vehicles and in the field of electronics nomadic. As they age, the performance of these batteries deteriorates, which results in a decrease in their capacity and an increase in their resistance. This results in a loss of battery life and a decrease in its life. Aging occurs over time, even if the battery is left at rest. The state of health of a battery is generally represented by an indicator called "SOH" (of the English "State Of Health") expressed in percentage, a new battery having a SOH of 100%. The monitoring of the SOH of a battery over time makes it possible to optimize the use of the battery and to guard against possible malfunctions. This makes it possible, in particular, to determine when a battery initially used for a first application can be changed from a frame of use to be used in a second application or simply to be replaced by a new battery to avoid any malfunction. For example, a battery can be used, as a first application, to power an electric or hybrid vehicle and then be used, in second application, to supply auxiliaries of power plants or stations or substations of the electrical networks. Other examples of second-life uses are presented in the document "Study of the second life of batteries of electric and plug-in hybrid vehicles", ADEME report, 2011.
    A first standard method for estimating the SOH of a battery is to perform a full charge of the battery and then a complete discharge while measuring the amount of ampere-hours discharged to obtain the capacity of the battery. Such a method is time consuming. In addition, it is difficult to implement during normal use of the battery, during the life of it. It is more of a diagnostic or maintenance method than a monitoring method.
    A second known method for estimating the SOH of a battery uses electrochemical impedance spectroscopy. This requires taking the battery out of its operating environment and having appropriate instrumentation and means for monitoring parameters of an impedance model. Such a method is complex to implement and expensive. It does not know the capacity of the battery. In addition, it can not be embedded in a battery control system or BMS (Battery Management System). Other known methods for estimating the SOH of a battery are based on artificial intelligence techniques such as neural networks or fuzzy logic, or on the identification of parameters of a model, for example by filtering of Kalman. These methods use complex algorithms that require large processing and computation resources.
    The present invention improves the situation.
    OBJECT OF THE INVENTION To this end, the invention relates to a method for determining a health status indicator of a lithium battery, characterized in that it comprises a delay step during a relaxation phase of the voltage of the battery after a discharge phase, or charge, of the battery, a step of measuring a battery voltage after relaxation at a time tn end of delay, and a step of calculating the indicator state of health of the battery at time tn from the voltage after relaxation measured at time tn and a voltage after relaxation of the battery measured early in the life of the battery.
    The determination of the state of health of a lithium battery according to the invention offers multiple advantages: it is simple to implement, reliable and accurate and can be executed during normal use of the battery, for example during its use in an electric or hybrid vehicle or in a nomadic device. It does not induce further aging of the battery.
    In a particular embodiment of the invention, the health status indicator is calculated by the following relationship:
    where SOH (tn) is the health status indicator of the battery at time tn, OCVtn represents the voltage of the battery after relaxation measured at time tn, OCVto represents the battery voltage after relaxation at the beginning of battery life, B represents a coefficient of degradation of the battery.
    Advantageously, the steps of delaying and measuring the voltage after relaxation of the battery are implemented after a discharge, or a complete charge of the battery. The determination of the state of health of the battery is reliable and accurate when measuring the voltage after relaxation following a
    complete discharge or at a complete charge at a well-defined current regime which is preferably greater than C / 2. However, the discharge (or charge) could be only partial, preferably less than 50% (respectively greater than 50%).
    Advantageously, said discharging or charging phase of the battery is carried out at a predetermined temperature of the battery, in particular a temperature below 45 ° C, preferably between 15 ° C and 50 ° C.
    In a particular embodiment, the method comprises a step of detecting said phase of discharging, or charging, the battery during use of said battery of supplying a load. The state of health of the battery is thus determined during use of the battery, connected to a charging element such as an electric vehicle or hybrid electric vehicle or a nomadic device.
    Advantageously, the delaying step has a duration adapted so that the voltage after relaxation reaches at the time of end of delay a value between Ue-5itiv and Ue + 5itiv, Ue representing an equilibrium value of the tension after complete relaxation.
    Advantageously, the duration of the delay step is greater than or equal to 10 minutes, in particular greater than or equal to 20 minutes, in particular still greater than or equal to 30 minutes.
    In a particular embodiment of the invention, the method comprises the implementation, at the beginning of the life of said battery, of a delay step during a relaxation phase of the battery voltage after a discharge phase. , or charge, the battery, and a step of measuring a voltage after relaxation of the battery at a time to end of delay.
    The "early life" of the battery may be characterized by an SOH greater than or equal to 98%. Generally, this is when the battery capacity is greater than or equal to its nominal value.
    Preferably, the duration of the delaying step preceding the measurement of the voltage after relaxation at the start of life time t0 is identical to the duration of the delaying step preceding the measurement of the voltage after relaxation at the start of life. moment tn
    More preferably, the discharge phase, or charge, of the battery preceding the measurement of the voltage after relaxation at time t0 of the beginning of life is carried out at the same determined temperature as that at which the phase is carried out. discharging, or charging, the battery preceding the measurement of the voltage after relaxation at time tn.
    Thus, the conditions of battery temperature and / or delay time are the same for the measurement of the voltage after relaxation at the beginning of life and for the measurement of the voltage after relaxation at any time during the life of the battery .
    In a particular embodiment of the invention, the coefficient B is determined during a configuration step implemented on a control battery of the same technology as said battery, during which a value of coefficient B adapted to obtain a curve of evolution of the indicator SOH of the control battery according to a number of cycles of charge and discharge, by the relation
    .B, which is adjusted to a reference curve of evolution of the indicator SOH of the control battery according to a number of charge and discharge cycles.
    Advantageously, the control battery is aged by applying charging and discharging cycles and, during aging of the battery
    control, the tension is measured after relaxation of the control battery, at a time t0 of the beginning of the life of the control battery and at different times tn during the lifetime of the control battery, in order to obtain the voltage after relaxation OCVto of early life and different tensions after relaxation OCVtnen course of life.
    Advantageously, the charging and discharging cycles of the control battery are carried out under the same temperature conditions and using the same charging and discharging currents as for carrying out the charging and discharging cycles carried out in order to obtain the curve. reference of evolution of the indicator SOH of the control battery.
    Said reference curve of evolution of the SOH indicator can be obtained by a method of measuring capacitances discharged following complete charges of battery. The invention also relates to a device for determining a health status indicator of a lithium battery, characterized in that it comprises a timing module during a phase of relaxation of the battery voltage after a phase for discharging, or charging, the battery, a module for measuring a battery voltage after relaxation at a time tn for the end of the delay, and a module for calculating the health indicator of the battery at time tn from the voltage after relaxation measured at time tn and from a voltage after relaxation of the battery measured at the beginning of battery life.
    The device advantageously comprises all or part of the following additional features: the calculation module is arranged to calculate the health status indicator is by the following relation:
    where SOH (tn) is the health status indicator of the battery at time tn, OCVtn represents the voltage of the battery after relaxation measured at time tn, OCVto represents the battery voltage after relaxation at the beginning of battery life, B represents a coefficient of degradation of the battery. the device comprises a module for detecting said phase of discharging, or charging, the battery during use of said battery of feeding a load; said detection module is adapted to detect that said discharge phase, or charge phase, is carried out at a determined temperature of the battery, in particular a temperature below 45 ° C., preferably between 15 ° C. and 50 ° C. . The invention also relates to a control system of a lithium battery incorporating the device as defined above. The invention also relates to an electric or hybrid motor vehicle, comprising a lithium battery and a battery control system as defined above. The invention finally relates to a nomadic device, comprising a lithium battery and a battery control system as defined above.
    Brief description of the drawings The invention will be better understood with the aid of the following description of a particular embodiment of the method for determining a health status indicator of a lithium battery and an associated device, according to the invention, with reference to the appended drawings in which: FIG. 1 represents curves of evolution of the voltage of a battery, in this case a lithium-ion battery, as a function of time, during a complete discharge and during a relaxation phase following this discharge, for different SOH of the battery; FIG. 2 represents a flowchart of the steps of the method for determining a health status indicator of a lithium battery according to a particular embodiment of the invention; FIG. 3 represents two evolution curves of the SOH of a control battery as a function of a number of charge / discharge cycles respectively obtained by a standard method for determining the SOH and by the method of FIG. 2, at a battery temperature of 25 ° C; two SOH evolution curves of a control battery as a function of a number of charge / discharge cycles, respectively obtained by a standard SOH determination method and by the method of FIG. 2, at a battery temperature 45 ° C; FIG. 4 represents a functional block diagram of a device for determining a health status indicator of a lithium battery according to one particular embodiment of the invention, for the implementation of the method of FIG. 2.
    DETAILED DESCRIPTION OF PARTICULAR EMBODIMENTS OF THE INVENTION
    The method of the invention aims to determine a representative parameter or an indicator of the state of health of a lithium battery 1, in this case the "SOH" (of the English "State Of Health"). The SOH of a battery is expressed as a percentage. It is 100% when the battery is in new condition and decreases with aging of the battery.
    The battery 1 is intended to electrically power a load 2. By the term "charge" is meant an element intended to consume the electrical energy supplied by the battery 1. The load 2 is for example an electric motor of a vehicle electric or hybrid car or a mobile device (mobile phone, tablet, or other). The method is here implemented during normal use of the battery, that is to say while the battery 1 is connected to the load 2 and supplies it with electrical energy. It could however be implemented outside the normal use of the battery, for example during a diagnosis.
    A BMS 3 (Battery Management System), or battery control system, is intended to control the battery 1 and monitor the state of different elements of the battery 1. The BMS 3 includes a device 4 determining the SOH of the battery 1, intended to implement the method of determining the SOH of the battery 1 of the invention.
    With reference to FIG. 2, the method for determining the SOH of the battery 1 according to a particular embodiment of the invention will now be described.
    The method comprises a first discharge detection step E2, here a complete discharge, of the battery 1 at a predefined temperature of the battery 1, called the reference temperature Tref, with an accuracy of ± ΔΓ = ± 3 ° C. The full discharge at the detected temperature Tref occurs here during normal use of the battery 1 connected to the associated load 2. The temperature Tref is here equal to 25 ° C. The temperature Tref could be different from 25 ° C., advantageously lower than 45 ° C., advantageously still between 15 ° C. and 50 ° C.
    FIG. 1 shows different evolution curves of the voltage U of the battery (expressed in volts) as a function of time, during and after a complete discharge of the battery 1, for different states of health or SOH of the battery 1, in this case for the following SOH values: 100% (curve Co), 96.4% (curve Ci), 93.5% (curve C2), 86.5% (curve C3), 75, 1% (curve C4) and 57.1% (curve C5). These curves Co to C5 are determined at a temperature of the battery 1 equal to the reference temperature Tref. It can be seen in this FIG. 1 that the complete discharge of the battery 1 causes a drop in the voltage U of the battery 1 to a minimum value LUn, here equal to 3V. The complete discharge of the battery 1 is followed by a relaxation phase during which the voltage U increases until it reaches an equilibrium voltage Ue at which it stabilizes. For the sake of clarity, only some of the equilibrium voltages Ueo, Uei, .... Ues relating to the voltage curves C0 to C5 are indicated in FIG. 1. The complete relaxation of a battery until reaching the voltage d Ue balance is a phenomenon that can take several hours. However, as can be seen in FIG. 1, the voltage U of the battery reaches a value close to the equilibrium voltage Ue, between Ue-5itiV and Ue + 5itiV, rapidly after the start of the relaxation phase.
    Following step E2 of detecting a complete discharge of the battery 1, the method continues with a step E3 of delay or pause during the relaxation phase. This delay step E3 consists in waiting for the voltage U of the battery 1 to reach a value equal to or close to the equilibrium voltage Ue. The duration of the delay step E3 can be parameterized. It must be adapted so that a measured voltage after relaxation, denoted OCVtn, reaches at time tn end of delay a value between Ue-5itiv and Ue + 5itiv, Ue representing the value of the voltage of equilibrium after complete relaxation of the battery 1. By definition, the "voltage after relaxation" represents the voltage of the battery 1 at the end of the delay step E3, after at least partial relaxation of the battery 1 of sufficient duration so that the voltage of the battery 1 reaches a value equal to or close to the equilibrium voltage Ue, between Ue-5itiv and Ue + 5itiv. In the embodiment described here, the duration τ of the delay step E3 is equal to, or substantially equal to, 30 minutes. As a variant, the delay time τ could be greater than or equal to 10 minutes, preferably greater than or equal to 20 minutes. In any event, this delay time τ is fixed, that is to say always the same at each determination of the SOH of the battery 1. The delay step E3 is followed by a step E4 for measuring the voltage after relaxation OCVtn of the battery 1 at time tn end of delay, where n (integer greater than or equal to 1) indicates the order number of the determination of the SOH during the life of the battery 1.
    Alternatively, instead of detecting a complete discharge of the battery 1 during its normal use, it could be envisaged to command a complete discharge of the battery 1 specifically to then perform the delay steps E3 and relaxation voltage measurement E4.
    The method then comprises a step E5 of calculating the health state indicator SOH of the battery at time tn from the voltage after relaxation OCVtn measured at time tn and a voltage after relaxation OCVto of battery 1 measured at the beginning of battery life 1 at a moment to. The SOH of the battery 1 at the moment tn is calculated by the following relation: where
    - SOH (tn) is the health status indicator of the battery 1 at the moment tn, - OCVtn represents the voltage after relaxation of the battery 1 measured at time tn, - OCVto represents the voltage after relaxation of the battery 1 measured at the beginning of the life of the battery 1 at a time t0, - B represents a coefficient of degradation of the battery 1.
    The voltage after relaxation OCVtode early life of the battery 1 is measured during a first step of EO configuration or calibration. By the expression "early life of the battery" is meant to mean that the battery is in a new or almost new state, its SOH being equal to or substantially equal to 100%, advantageously greater than or equal to 98%.
    The configuration step EO comprises the implementation, at the beginning of the life of said battery 1, of a delay step E01 during a relaxation phase of the voltage of the battery 1, subsequent to a phase E00 of complete discharge of the battery 1, and a step E02 measuring a voltage of the battery after relaxation at a time to end of delay. The step E00 of complete discharge of the battery 1 is here detected by the control system or BMS 3 of the battery 1, which triggers the execution of the timing steps E01 and measurement E02. Alternatively, one could control (and therefore force) a complete discharge of the battery 1, early in life thereof, and then implement the timing steps E01 and E02 measurement. The timing steps E01 and measurement E02 are similar to the timing steps E3 and measurement E4 as previously described, with the difference that they are implemented early in the life of the battery 1. In particular, the duration of delay of step E01 is equal to the duration τ of time delay of step E3. In addition, the temperature of the battery 1 during the complete discharge phase preceding the timing steps E01 and measurement E02 is equal to the temperature Tref with an accuracy of ± ΔΓ (with ΔΤ = 3 ° C) of the battery 1 during the complete discharge detected in step E2. In other words, the temperature conditions of the battery 1 and of the delay time τ relating to the measurement of OCVto are the same as those relating to the measurement of OCVtn.
    Alternatively, the voltage after relaxation OCVto early life of the battery 1 may be a data provided by the manufacturer of the battery 1.
    The degradation coefficient B of the battery 1 is determined during a second preliminary configuration or calibration step E1. This step E1 is implemented on a control battery of the same technology as the battery 1. By the expression "of the same technology" is meant to mean that the control battery and the monitored battery 1 have the new state of technical characteristics identical (identical batteries and / or same manufacturer and / or same capacity and / or of the same series and / or of the same reference). Step E1 comprises several substeps E10 to E13, described below.
    The first substep E10 is a step of obtaining evolution data of the SOH of the control battery as a function of the number of charging and discharging cycles of the control battery, at a given temperature of the control battery, here equal at the reference temperature (25 ° C), using a charging current of 1C and a discharge current of 1C. These SOH evolution data as a function of the number of charge / discharge cycles are determined by a measurement method of the SOH different from that of the invention, for example by measuring the discharged capacity (that is to say the number of amperes hours discharged) during a complete discharge after a full charge. They are represented in FIG. 3 by the so-called "reference" SOHref curve. These SOH evolution reference data as a function of the number of charge / discharge cycles are generally provided by the manufacturer of the control battery. They could of course be measured directly by aging the control battery. In this case, the next step E11 (described below) uses another identical control battery.
    Sub-step E11 is an aging step of the control battery, during which the control battery is aged in the same conditions as those just indicated with respect to the SOHref curve, that is to say in it. applying a succession of charge and discharge cycles at a given battery temperature (here equal to the reference temperature of 25 ° C), and using a charging current of 1C of a discharge current of 1C.
    During aging, several voltage measurements are made after relaxation of the control battery during a measurement substep E12. This substep E12 comprises, at a time to start of life of the control battery and at different times tn during the life of the control battery (that is to say during its aging), measurements of the voltage after relaxation of the control battery, after a complete discharge of the control battery then a time delay τ (similar to the previously described steps E2 and E3), in order to obtain the OCVto value and various voltage OCVtn values after relaxation of the control battery, at the beginning of life and at different times in the course of life.
    The measurement sub-step E12 is followed by an adjustment sub-step E13. During this adjustment sub-step E13, a value of the coefficient B is sought which makes it possible to obtain a second evolution curve of the SOH indicator, denoted SOHinv, as a function of a number of charge and discharge cycles. of the control battery, given by the relation
    100β and which is best adjusted to the first SOHref reference curve. The determined coefficient B corresponds to that for which the adjustment between the two SOH curves, ie SOHref and SOHinv, is optimal. This optimal adjustment can be defined for example by a mean squared error close to 0.9 to 1 between the two curves.
    The coefficient B thus determined for a control battery can be used to determine the SOH of all the batteries of the same technology as the control battery. For example, for LMO batteries, the B coefficient is 10.
    The coefficient B thus determined also makes it possible to determine the SOH at different temperatures of the battery 1 by the relation SOH (tn) = 100 -
    .B. In FIG. 3, with the coefficient B determined at a battery temperature of 25 ° C., a SOH curve, denoted SOHinv_45, is obtained at a battery temperature of 45 ° C., which is close to an SOH curve. reference SOHref_45 at the battery temperature (45 ° C), obtained for example by a method of measuring discharged capacities.
    The method which has just been described is implemented by the device 4 for determining the state of health or SOH of the battery, integrated in the control system or BMS 3 of the battery 1.
    The device 4 comprises: a module 40 for detecting a phase of complete discharge of the battery 1 at a determined temperature of the battery here equal to the reference temperature of 25 ° C., during a use of the battery consisting in supplying a charge; a delay module 41 during a relaxation phase of the voltage of the battery 1 subsequent to a detected complete discharge phase; a module 42 for measuring a voltage after relaxation OCVtn of the battery 1 at a time tn for the end of the delay; a module 43 for calculating the health status indicator of the battery, or SOH, at time tn, from the voltage after relaxation OCVtn measured at time tn and from a voltage after relaxation of OCVtn battery measured at the beginning of battery life 1. L0
    The modules 40, 41, 42, 43 are intended to control the execution of the steps E2, E3, E4 and E5 respectively.
    The modules 40, 41 and 42 are also intended to control the implementation of the configuration steps E00, E01 and E02 respectively.
    The device 4 further comprises a storage memory 44 in which the voltage after relaxation OCVto measured at the beginning of life of the battery 1 and the coefficient B are recorded.
    The device 4 is integrated in the battery control system or BMS 3. The invention therefore also relates to the battery control system 3 incorporating the device 4. The invention also relates to an electric or hybrid motor vehicle incorporating such a device. Finally, the invention relates to a nomadic device (for example mobile phone, tablet, etc.) integrating such a battery control system 3. The configuration or calibration step E1 intended to determine the coefficient B for batteries of a given technology from a control battery of this technology is implemented by means of test equipment which includes: - a device intended to apply charge and discharge cycles (complete ) the battery to age the battery, adapted to implement step E11; a device for measuring voltages after relaxation of the control battery, OCVtn, OCVto, at different times of end of delay t1 and tn, adapted to implement step E12; a processing device incorporating a software adjustment module, intended to implement the adjustment step E13 in order to determine a value of the coefficient B from the data relating to the reference curve SOHref and from the measurements OCVtn, OCVto .
    In the foregoing description, the timing steps during the relaxation phase and then measuring the voltage after relaxation are implemented after a complete discharge of the battery. As a variant, it could be envisaged to implement them after a partial discharge of the battery, up to a predefined charge state, preferably less than or equal to 50%, for example equal to 50% or 20%, or after a complete charge of the battery, or after a partial charge of the battery to a predefined charge state, preferably greater than or equal to 50%, for example equal to 50% or 80%.
    权利要求:
    Claims (21)
    [1" id="c-fr-0001]
    1. Method for determining a health status indicator (SOH) of a lithium battery (1), characterized in that it comprises a step (E3) of delay during a phase of relaxation of the voltage of the battery (1) after a discharge phase, or charging, of the battery (1), a step (E4) of measuring a battery voltage after relaxation at a time tn end of delay, and a step (E5) for calculating the health indicator of the battery at time tn from the voltage after relaxation (OCVtn) measured at time tn and a voltage after relaxation of the battery {OCVto ) measured at the beginning of the battery life (1).
    [2" id="c-fr-0002]
    2. Method according to the preceding claim, characterized in that the health status indicator is calculated by the following relationship:

    where SOH (tn) is the health status indicator of the battery at time tn, OCVtn represents the voltage of the battery after relaxation measured at time tn, OCVto represents the battery voltage after relaxation at the beginning of battery life, B represents a coefficient of degradation of the battery.
    [3" id="c-fr-0003]
    3. Method according to one of the preceding claims, characterized in that the steps of delay (E3) and measurement (E4) of the voltage after relaxation of the battery are implemented after a discharge, or a charge, full of the battery (1).
    [4" id="c-fr-0004]
    4. Method according to one of the preceding claims, characterized in that said discharge phase, or charge, the battery (1) is carried out at a predetermined temperature of the battery, in particular a temperature below 45 ° C, preferably between 15 ° and 50 ° C.


    [5" id="c-fr-0005]
    5. Method according to one of the preceding claims, characterized in that it comprises a step of detecting said discharge phase, or charging, of the battery (1) during use of said battery of supplying a load.
    [6" id="c-fr-0006]
    6. Method according to one of the preceding claims, characterized in that the delay step (E3) has a duration adapted so that the voltage after relaxation reaches at the time of end of delay a value between Ue -5itiv and Ue + 5itiv, Ue representing an equilibrium value of the voltage after complete relaxation.
    [7" id="c-fr-0007]
    7. Method according to one of the preceding claims, characterized in that the duration of the delay step (E3) is greater than or equal to 10 minutes, in particular greater than or equal to 20 minutes, in particular still greater than or equal to 30 minutes .
    [8" id="c-fr-0008]
    8. Method according to the preceding claim, characterized in that it comprises the implementation, at the beginning of life of said battery, a timing step (E01) during a relaxation phase of the voltage of the battery after a phase (E00) for discharging, or charging, the battery, and a step (E02) for measuring a voltage after relaxation of the battery at a time to end of delay.
    [9" id="c-fr-0009]
    9. Method according to the preceding claim, characterized in that the duration of the delay step (E01) preceding the measurement (E02) of the voltage after relaxation at time to start of life is identical to the duration of the timing step (E3) preceding measurement (E4) of the voltage after relaxation at time tn.
    [10" id="c-fr-0010]
    10. Method according to one of claims 8 and 9, characterized in that the discharge phase (E00), or charge, of the battery (1) preceding the measurement of the voltage after relaxation at time to start of life is performed at the same determined temperature as that at which the discharge phase (E2), or charge, of the battery (1) preceding the measurement of the voltage after relaxation at time tn.
    [11" id="c-fr-0011]
    11. Method according to the preceding claim, characterized in that the coefficient B is determined during a configuration step (E1) implemented on a control battery of the same technology as said battery (1), during which a coefficient value B adapted to obtain an evolution curve of the indicator SOH of the control battery according to a number of charging and discharging cycles, by the relation

    B, which is adjusted (E13) to a reference curve of evolution of the indicator SOH of the control battery according to a number of charging and discharging cycles.
    [12" id="c-fr-0012]
    12. Process according to the preceding claim, characterized in that the control battery is aged by applying to it (E11) charge and discharge cycles and, during the aging of the control battery, (E12) measurements are carried out. of the voltage after relaxation of the control battery, at a time t0 of the beginning of life of the control battery and at different times during the lifetime of the control battery, in order to obtain the voltage after relaxation OCVto of beginning of life and different tensions after relaxation OCVtnen course of life.
    [13" id="c-fr-0013]
    13. Method according to one of claims 11 and 12, characterized in that the charge and discharge cycles of the control battery are performed under the same temperature conditions and using the same charging and discharging currents as for the execution of the charging and discharging cycles carried out in order to obtain the evolution reference curve of the indicator SOH of the control battery.
    [14" id="c-fr-0014]
    14. Method according to one of claims 11 to 13, characterized in that said reference curve of evolution of the SOH indicator is obtained by a capacitance measurement method discharged following complete battery charges.


    [15" id="c-fr-0015]
    15. Device for determining a health status indicator of a lithium battery, characterized in that it comprises a timing module (41) during a relaxation phase of the battery voltage (1) after a discharge phase, or charge, of the battery (1), a module (42) for measuring a battery voltage after relaxation at a time tn end of delay, and a module (43) for calculating the health status indicator of the battery at time tn from the voltage after relaxation (OCVtn) measured at time tn and a voltage after relaxation of the battery (OCVto) measured at the beginning of life drums.
    [16" id="c-fr-0016]
    16. Device according to claim 15, characterized in that the calculation module (43) is arranged to calculate the health status indicator is by the following relationship:

    where SOH (tn) is the health status indicator of the battery at time tn, OCVtn represents the voltage of the battery after relaxation measured at time tn, OCVto represents the battery voltage after relaxation at the beginning of battery life, B represents a coefficient of degradation of the battery.
    [17" id="c-fr-0017]
    17. Device according to one of claims 15 and 16, characterized in that it comprises a module (40) for detecting said discharge phase, or charging, of the battery (1) during use of said battery consisting of to feed a load.
    [18" id="c-fr-0018]
    18. Device according to the preceding claim, characterized in that said detection module (40) is adapted to detect that said discharge phase, or charging, is carried out at a predetermined temperature of the battery, in particular a temperature below 45 ° C, preferably between 15 ° C and 50 ° C.


    [19" id="c-fr-0019]
    19. Control system of a lithium battery, characterized in that it integrates the device according to one of claims 15 to 18.
    [20" id="c-fr-0020]
    Electric or hybrid motor vehicle, comprising a lithium battery and a battery control system according to claim 19.
    [21" id="c-fr-0021]
    Portable device, comprising a lithium battery and a battery control system according to claim 19.
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    同族专利:
    公开号 | 公开日
    FR3041764B1|2017-11-24|
    WO2017050944A1|2017-03-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20120310565A1|2011-05-31|2012-12-06|Laszlo Redey|Apparatus and method for determining battery/cell's performance, age, and health|
    EP2568303A2|2011-09-12|2013-03-13|EaglePicher Technologies, LLC|Systems and methods for determining battery state-of-health|
    US10031186B2|2015-11-24|2018-07-24|Honeywell International Inc.|System for assuring safe operation of batteries|
    FR3074918B1|2017-12-08|2020-10-16|Commissariat Energie Atomique|PROCESS FOR DETERMINING THE STATE OF HEALTH OF A BATTERY AND DEVICE IMPLEMENTING THIS PROCEDURE|
    FR3087393B1|2018-10-23|2020-10-23|Psa Automobiles Sa|PROCESS FOR DETERMINING THE STATE OF AGING OF AN ELECTROCHEMICAL BATTERY|
    FR3087392B1|2018-10-23|2020-10-23|Psa Automobiles Sa|PROCESS FOR DETERMINING THE STATE OF CHARGE AND STATE OF AGING OF AN ELECTROCHEMICAL BATTERY AS A FUNCTION OF AN OPEN CIRCUIT VOLTAGE MAPPING|
    法律状态:
    2016-09-28| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-31| PLSC| Publication of the preliminary search report|Effective date: 20170331 |
    2017-09-29| PLFP| Fee payment|Year of fee payment: 3 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1559007A|FR3041764B1|2015-09-24|2015-09-24|METHOD AND DEVICE FOR DETERMINING A HEALTH STATUS INDICATOR OF A LITHIUM BATTERY|FR1559007A| FR3041764B1|2015-09-24|2015-09-24|METHOD AND DEVICE FOR DETERMINING A HEALTH STATUS INDICATOR OF A LITHIUM BATTERY|
    PCT/EP2016/072625| WO2017050944A1|2015-09-24|2016-09-23|Method and device for determining a state-of-health indicator for a lithium battery|
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