• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    It is a method for managing a state of charge (SOC) of a battery (50) connected to power a power distribution network (55), the method comprising the following steps: - estimating ( 100) a value range of said state of charge of the battery minimizing the state of aging of the battery, - charging or discharging the battery to reach an optimum value of state of charge within said range of value, In addition, the method comprises the following preliminary step (120): - detecting an unused state of the battery during which the battery is neither charged nor discharged.
    公开号:FR3016737A1
    申请号:FR1450420
    申请日:2014-01-20
    公开日:2015-07-24
    发明作者:Yann Chazal；Do-Hieu Trinh；Philippe Toussaint；Mathieu Umlawski
    申请人:Renault SAS；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The invention relates to a method for managing a state of charge of a connected battery for powering a power distribution network. This invention can be applied regardless of the type of battery and extends non-exclusively to vehicles. In particular, the invention finds a particularly advantageous application for managing the state of charge of a plurality of connected batteries for powering a power distribution network, so as to maximize their residual capacity.
    [0002] STATE OF THE ART In the field, there are known methods for managing a state of charge of a connected battery for powering a power distribution network. These methods include the steps of: estimating a range of value of said state of charge of the battery minimizing the state of aging of the battery, charging or discharging the battery to reach a state of charge value within said value range . Such an example is disclosed in US2012 / 0249048 which discloses a solution in which the state of aging of the battery is limited by operating the batteries, both at the load and the discharge, in a range of values of the state of the battery. load between two values.
    [0003] It has been found that the invention described in US2012 / 0249048 has the disadvantage of not taking into account all the elements necessary to minimize the state of aging of the battery. Is disclosed a fixed value range, which is not optimal, to minimize the aging state of the battery. For example, during a long period of non-use of the battery, the battery may remain at a suboptimal state of charge, in the sense that there are other state of charge values that would degrade the battery less. OBJECT OF THE INVENTION In this context, the problem posed here is to optimize the management of the state of charge of a battery.
    [0004] In particular, it is a question of minimizing the calendar degradation of the battery. It also aims at optimizing the choice of the ranges of value of the state of charge of the battery by taking into account the operating state of the battery; in particular, the present invention aims to take into account the operating state of the battery, such as charging, discharging, or periods of non-use of the battery (periods during which the battery is neither charged nor discharged but can self-download). It also aims at optimizing the ranges of value of the state of charge of the battery according to the operating temperature of the battery and / or the ambient temperature to minimize the state of aging of the battery. To this end, the invention particularly relates to a method of managing a state of charge of a connected battery for powering a power distribution network. The method includes a step of estimating a value range of said state of charge minimizing the state of aging of the battery. It also comprises a step of charging or discharging the battery to reach an optimal state of charge value within said value range. The method according to the invention is characterized in that it advantageously comprises a preliminary step of detecting a state of non-use of the battery during which the battery is neither charged nor discharged. This solution overcomes the aforementioned problems. In particular, the detection of the state of non-use of the battery makes it possible to place the battery under favorable conditions minimizing its state of aging when the battery is not used.
    [0005] In one embodiment, during the preliminary step, the expiration of a predetermined period during which the battery is in the idle state is detected. In one embodiment, the value range of said state of charge of the battery is defined by a first minimum value and a second maximum value that vary according to a temperature related to the battery. In one embodiment, the temperature attached to the battery is an operating temperature of the battery. In one embodiment, the temperature associated with the battery is an ambient temperature of an enclosure in which the battery is installed. In one embodiment, a step is provided for estimating the temperature related to the battery from said ambient temperature and battery operation information.
    [0006] In one embodiment, for an operating temperature range of the battery between 10 ° C and 25 ° C: the first value is equal to 10%, and the second value is equal to 70%. In one embodiment, for an operating temperature of the battery substantially equal to 45 ° C: the first value is equal to 50%, and the second value is equal to 70%.
    [0007] In one embodiment, for an operating temperature of the battery substantially equal to 55 ° C: the first value is equal to 50%, and the second value is equal to 70%. In one embodiment, the method includes the following preliminary steps: measuring the state of charge of a plurality of batteries, selecting a battery from said plurality of batteries.
    [0008] In one embodiment, an additional step makes it possible to determine the aging state of a battery by collecting information relating to physical quantities of the battery. A second object of the invention is also contemplated, in which a system for managing a state of charge of a battery comprises means for implementing the method according to any one of the preceding embodiments. Brief Description of the Figures Figure 1 shows an example architecture of the stationary storage system.
    [0009] FIG. 2 shows a diagram illustrating an exemplary management method according to the invention. Figure 3 shows a diagram illustrating another example of a management method according to the invention.
    [0010] FIG. 4 shows a curve representing the evolution of the degradation coefficient of the battery (ie its state of aging) as a function of the state of charge of the battery in a range of operating battery temperatures of between 10 ° C. and 25 ° C.
    [0011] FIG. 5 shows a curve representing the evolution of the degradation coefficient of the battery (ie its state of aging) as a function of the state of charge of the battery for a battery operating temperature substantially equal to 45 ° C. .
    [0012] FIG. 6 shows a curve representing the evolution of the degradation coefficient of the battery (i.e. its aging state) as a function of the state of charge of the battery for a battery operating temperature substantially equal to 55 ° C.
    [0013] DESCRIPTION OF EMBODIMENTS OF THE INVENTION Depending on its aging, the performance of the battery 50 may vary greatly during its use. A stationary storage system 56 controls this information. The main function of the stationary storage system 56 is to implement the management of the information on the state of each battery 50 constituting the plurality of batteries 50 in order to allow a use of the plurality of batteries 50 to the maximum of its energy capacities. by minimizing the state of aging of the battery 50.
    [0014] Conventionally, the stationary storage system is capable of collecting, in a step 20, information relating to physical quantities for determining the state of aging of a battery, of the following type (non-exhaustive list): the operating temperature in different battery points, - the current and the total voltage of the battery, - the voltage of each cell of the battery, - the state of charge of the battery, - the available energy remaining in discharge, the available power in discharge . As shown in FIG. 1, the stationary storage system 56 for the residual capacities of a plurality of batteries 50 comprises the following elements: a battery 50, a battery supervision system 51, a control system 52. stationary storage, - a charger 53, - an inverter 54. These elements form the stationary storage system 56. This stationary storage system 56 is connected to the AC network 55.
    [0015] The battery monitoring system 51 acquires physical quantities of the battery (temperature measurements, voltages of each cell, current, etc.). These physical quantities notably have the function of determining the state of aging of the battery 50. The system 51 for monitoring the battery 50 makes calculations from these measurements in order, for example, to determine: a minimum voltage of the cells Vcellmin; a first binary value indicating whether the charge is complete fEoc = 1 or fEoc = 0; a charging power PcHG, FivB or a discharge power PDCHG, HVB that the battery 50 can support without being damaged; a voltage VHVB and a current IFivE3 measured at the terminals of the battery 50; a quantity of EFivE3 energy available from the battery 50. The supervision system 51 of the battery 50 communicates the physical quantities for determining the state of aging of the battery 50 to the stationary storage control system 52. The battery monitoring system 51 makes it possible in particular to perform a step 70 of measuring the operating temperature of the battery 50. The stationary storage control system 52 is subject to certain energy constraints. For example, the stationary storage control system 52 may require charging the battery 50 during off-peak hours and discharging it during peak hours. As shown in FIG. 1, the stationary storage control system 52 establishes charge or discharge instructions as a function of the information it receives and its energy constraints. The setpoints are sent to the charger 53 or the inverter 54 to be realized: the battery 50 is charged or discharged. According to the invention, the method of managing a state of charge SOC of a battery 50 connected to power a power distribution network 55 comprises the following steps: detecting a state of inactivity of the battery during which the battery is neither charged nor discharged, estimating a value range of said state of charge of the battery minimizing the state of aging of the battery, charging or discharging the battery to reach an optimal state of charge value within said value range.
    [0016] The preliminary step 120 including detecting an unused state of the battery during which the battery is neither charged nor discharged, can for example detect the expiration of a predetermined period during which the battery is in the state not in use. This preliminary step advantageously makes it possible to put the battery under conditions that minimize its calendar degradation. The state of non-use of a battery is a state in which the battery is particularly vulnerable, that is why charging or discharging the battery to reach a value within the range of value minimizing its state of aging makes it possible to preserve said battery . In the absence of active use, it is therefore appropriate to position as often as possible the battery 50 in a state of charge SOC limiting this degradation.
    [0017] In the case of active use (in a state of use), the battery 50 can typically be charged or discharged without taking into account said value range minimizing the aging state of the battery 50. instructing him to operate the storage system 56, the stationary storage control system 52 is free to decide on the charge level at which to position each battery 50.
    [0018] Furthermore, the invention also provides a method for managing a state of charge of a plurality of batteries connected together to power a grid 55 for distributing electrical energy, this method comprising a storage phase for storing in the plurality of batteries 50 of the energy coming from the network 55 and a destocking phase to restore the energy on the network 55. It is thus clear that the step 110 of charging the battery 50 corresponds to the storage phase to store in the plurality of batteries of the energy from the network 55 and the discharge of the battery 50 corresponds to the destocking phase to restore the energy on the network 55. Waiting for an instruction to operate the storage system 56 , the stationary storage control system 52 is free to decide on the level of charge to which to position each battery 50. Thus, when the state of charge management method of the plurality The battery unit is neither in the storage phase nor in the destocking phase, so the plurality of batteries 50 is considered to be in a state of inactivity, that is to say that the storage system 56 is not asked. Among the factors influencing the aging state of a battery 50, there is the temperature. In a context of use in a stationary storage system 56 comprising a plurality of batteries 50, these are conventionally located in narrow and closed enclosures, such as technical rooms. Consequently, the ambient temperature of an enclosure in which battery 50 is connected to power a power distribution network 55 varies according to parameters such as the geographical position of the enclosure concerned, the position of the enclosure within building etc. In addition, for the same chamber, the ambient temperature may vary over time depending on the sun exposure, seasons etc. Finally, the use of such a stationary storage system 56 will generate heat and affect the ambient temperature of the room. In view of the impact of the temperature on the aging state of a battery 50, step 120 including detecting the state of non-use of the battery is particularly advantageous because it makes it possible to update parameters that can serve to bring the battery 50 in the value range of the state of charge minimizing the aging state of the battery. In another embodiment, the value range comprises a first minimum value SOC1 and a second maximum value SOC2 which vary as a function of a temperature T linked to the battery 50, according to a relation SOC1 = fl (T), respectively SOC2 = f2 (T). This advantageously makes it possible to minimize the calendar degradation of the battery 50 impacting the aging state of the battery 50. The temperature associated with the battery may be an ambient temperature of an enclosure in which the battery 50 is installed or an operating temperature. drums. In one embodiment, a step 60 for measuring the ambient temperature of the enclosure in which the battery 50 is installed is thus provided. Alternatively, it is possible to perform a step 70 of measuring the operating temperature of the battery 50. In another embodiment of the invention, there is provided a step 80 for estimating the temperature T linked to the battery 50 from the ambient temperature and information about the operation of the battery.
    [0019] The step 65 including recording the information relating to the operation of the battery may for example correspond to a time interval during which the battery is neither charged nor discharged.
    [0020] The first value SOC1 and the second value SOC2 may follow a step 90 during which the first value SOC1 and the second value SOC2 are calculated as a function of the operating temperature of the battery and the ambient temperature of an enclosure in which the battery 50 is connected to power a network 55 of energy distribution. Alternatively, the first value SOC1 and the second value SOC2 are calculated during step 90 solely as a function of the operating temperature of the battery. According to another alternative, the first value SOC1 and the second value SOC2 are calculated during step 90 as a function of the ambient temperature. In addition to the ambient temperature of the enclosure and the operating temperature of the battery, the type of battery 50 used (lithium-ion etc.) must also be taken into account. In fact, the batteries 50 constituting the plurality of batteries connected for a power distribution network 55 do not all have the same sensitivities at ambient temperature. The value ranges of the state of charge of each battery minimizing the state of aging may therefore be different. In FIG. 4, it has been found that when the average operating temperature of the battery 50 is between 10 ° C. and 25 ° C., the calendar deterioration coefficient, therefore the aging state of the battery 50, is influenced. by the state of charge SOC of the battery 50. In essence, the higher the state of charge SOC of the battery 50, the higher the degradation coefficient of the battery. On the other hand, as can be seen in FIG. 4, from 70% of the state of charge of the battery, the curve increases very rapidly to adopt an exponential curve type shape. In this context, in order to minimize the state of aging of the battery, it is necessary to remain at a relatively low state of charge of the battery. Thus, according to an advantageous arrangement, for an operating temperature range of the battery between 10 ° C and 25 ° C: the first value (SOC1) is equal to 10%, and the second value (SOC2) is equal to 70%. In FIG. 5, tests similar to those shown in FIG. 4 have been carried out, but for an average operating temperature of the battery 50 substantially equal to 45 ° C. In the same way as for the results shown in FIG. 4 for a temperature range of between 10 ° C. and 25 ° C., the degradation coefficient increases rapidly when the state of charge of the battery 50 exceeds 70%. In addition, there is a sharp increase in the degradation coefficient for a SOC charge state of the battery of between 20% and 40%. Thus, according to another advantageous arrangement, for an operating temperature of the battery substantially equal to 45 ° C: the first value (SOC1) is equal to 50%, and the second value (S0C2) is equal to 70% . Finally, in FIG. 6, for battery operating temperature conditions which are even more demanding, with an operating temperature of the battery substantially equal to 55 ° C., the curve of the calendar degradation coefficient has a similar shape, with a abrupt increase between 20% and 40% of the state of charge of the battery 50 and another increase when the state of charge of the battery 50 exceeds 70%. Thus, according to another advantageous arrangement, for an operating temperature of the battery substantially equal to 55 ° C: the first value (SOC1) is equal to 50%, and the second value (SOC2) is equal to 70% . Once the state of charge SOC of the battery 50 calculated according to the operating temperature of the battery and / or the ambient temperature of an enclosure in which the battery 50 is connected to supply a distribution network of energy, corresponding here to the step 90 shown in Figure 2, it is appropriate to translate this charge SOC state energy to identify the set to be applied to the energy storage system 56. For example, for a battery 50 having a capacity equal to 14KWh, we would obtain a target energy range of between 7kWh and 9.8KWh which minimizes the aging state of the battery 50. In an embodiment shown in FIG. 3, the management method may also comprise the following preliminary steps: a step 10 of measuring the state of charge SOC of a plurality of batteries 50, a step 30 of selecting a battery 50 One of said plurality of batteries 50. This embodiment is advantageous for a plurality of batteries connected together for powering an electrical network. The management method may also include a step 20 of collecting information relating to physical quantities to determine the aging state of a battery 50. This information can be used to discard a battery 50 if its performance is insufficient. In the context of a service, the minimum energy level guaranteed to the customer is E2nd, MIN- This minimum energy level guaranteed to the customer E2nd, MIN is established according to the operating temperatures at which the battery 50 is subjected. In practice, it will therefore be necessary to verify that the first value SOC1 which is lower than the second value SOC2 allows to provide an energy higher than Etna, MIN. If this is not the case, it is necessary to consider either modifying the behavior of the stationary storage control system 52 to guarantee the guaranteed minimum energy level Eud, NIN, for example, by charging the battery 50 more but remaining in the value range of the state of charge, or to change the battery 50 connected to the plurality of other batteries 50, for another battery 50 having a higher residual capacity. The stationary storage control system 52 performs most of the calculations of interest to us in the context of the present invention.
    权利要求:
    Claims (12)
    [0001]
    REVENDICATIONS1. A method of managing a state of charge (SOC) of a battery (50) connected to power a power distribution network (55), the method comprising the steps (100, 110) of: estimating (100) a range of value of said state of charge of the battery minimizing the state of aging of the battery, charging (110) or discharging the battery to reach an optimum value of state of charge within said value range, said method being characterized in that it comprises the following preliminary step (120): detecting an unused state of the battery during which the battery is neither charged nor discharged.
    [0002]
    2. A method of managing a state of charge (SOC) of a battery (50) according to claim 1, characterized in that during the preliminary step (120), the expiry of a predetermined period during which the battery is in the idle state is detected.
    [0003]
    A method of managing a state of charge (SOC) of a battery (50) according to any one of claims 1 or 2, characterized in that said value range comprises a first minimum value (SOC1) and a second maximum value (S0C2) which vary according to a temperature (T) linked to the battery.
    [0004]
    4. A method of managing a state of charge (SOC) of a battery (50) according to claim 3, characterized in that the temperature (T) connected to the battery is an operating temperature of the battery.
    [0005]
    5. A method of managing a state of charge (SOC) of a battery (50) according to claim 3, characterized in that the temperature (T) connected to the battery is an ambient temperature of an enclosure in which the battery is installed.
    [0006]
    6. A method of managing a state of charge (SOC) of a battery (50) according to claim 5, characterized in that it comprises a step (80): - estimate the temperature (T) related to the battery from said ambient temperature and information relating to the operation of the battery (50).
    [0007]
    7. A method of managing a state of charge (SOC) of a battery (50) according to claim 4, characterized in that for an operating temperature range of the battery between 10 ° C and 25 ° C: the first value (SOC1) is equal to 10%, and the second value (S0C2) is equal to 70%.
    [0008]
    8. A method for managing a state of charge (SOC) of a battery (50) according to claim 4, characterized in that for an operating temperature of the battery substantially equal to 45 ° C: - the first value ( SOC1) is equal to 50%, and, - the second value (S0C2) is equal to 70%. 30
    [0009]
    9. A method for managing a state of charge (SOC) of a battery (50) according to claim 4, characterized in that for an operating temperature of the battery substantially equal to 55 ° C: the first value (SOC1) is equal to 50%, and the second value (SOC2) is equal to 70%.
    [0010]
    10. A method of managing a state of charge (SOC) of a battery (50) according to any one of claims 1 to 9, characterized in that it comprises the following preliminary steps: measuring (10) the state of charge (SOC) of a plurality of batteries, selecting (30) said battery (50) from said plurality of batteries.
    [0011]
    11. A method of managing a state of charge (SOC) of a battery (50) according to any one of claims 1 to 10, characterized in that it further comprises an additional step of determining the state aging the battery (50) by collecting (20) information relating to physical quantities of the battery (50).
    [0012]
    12. System for managing a state of charge (SOC) of a battery (50) comprising means for implementing the method according to any one of the preceding claims.
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    CN106103180A|2016-11-09|
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    法律状态:
    2015-01-22| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-01-20| PLFP| Fee payment|Year of fee payment: 4 |
    2018-01-19| PLFP| Fee payment|Year of fee payment: 5 |
    2020-01-21| PLFP| Fee payment|Year of fee payment: 7 |
    2021-01-21| PLFP| Fee payment|Year of fee payment: 8 |
    2022-01-19| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
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    FR1450420A|FR3016737B1|2014-01-20|2014-01-20|PROCESS FOR MANAGING A STATE OF CHARGE OF A BATTERY|FR1450420A| FR3016737B1|2014-01-20|2014-01-20|PROCESS FOR MANAGING A STATE OF CHARGE OF A BATTERY|
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    EP15705630.0A| EP3096974A1|2014-01-20|2015-01-15|Method for managing a state of charge of a battery|
    US15/111,404| US20160332531A1|2014-01-20|2015-01-15|Method for managing a state of charge of a battery|
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