WO2020216185A1 - 电池组均衡控制方法、装置、设备和介质 - Google Patents

电池组均衡控制方法、装置、设备和介质 Download PDF

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WO2020216185A1
WO2020216185A1 PCT/CN2020/085656 CN2020085656W WO2020216185A1 WO 2020216185 A1 WO2020216185 A1 WO 2020216185A1 CN 2020085656 W CN2020085656 W CN 2020085656W WO 2020216185 A1 WO2020216185 A1 WO 2020216185A1
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Prior art keywords
soc
voltage
cell
ocv curve
interval
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PCT/CN2020/085656
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English (en)
French (fr)
Inventor
李世超
杜明树
汤慎之
阮见
卢艳华
张伟
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宁德时代新能源科技股份有限公司
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Priority to EP20794365.5A priority Critical patent/EP3787146B1/en
Publication of WO2020216185A1 publication Critical patent/WO2020216185A1/zh
Priority to US17/106,239 priority patent/US11108247B2/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048Detection of remaining charge capacity or state of charge [SOC]

Definitions

  • This application relates to the field of new energy, and in particular to a method, device, equipment and medium for balancing control of a battery pack.
  • the capacity of the battery pack is not only limited by the cell with the smallest capacity, but also Because of this inconsistency, it will not be able to fully play. In order to increase the usable capacity of the battery pack, the battery pack can be balanced.
  • the balancing information of the cells in the battery pack is based on the open circuit voltage (OCV) of each cell and the battery pack.
  • OCV open circuit voltage
  • the SOC-OCV curve determines the SOC difference of each cell, and then determines the SOC difference of each cell.
  • the hysteresis effect refers to the inconsistency between the charging OCV and the discharging OCV of the cells, which makes it impossible to accurately estimate the SOC difference, and thus makes it impossible to accurately obtain the balance information of the cells.
  • the embodiments of the present application provide a method, device, device, and medium for controlling the balance of a battery pack, so as to achieve accurate acquisition of the balance information of the battery cell with the hysteresis effect.
  • a battery pack balance control method including:
  • the preset voltage interval is determined based on the hysteresis interval, and the hysteresis interval is the OCV interval corresponding to the part where the charging SOC-OCV curve and the discharging SOC-OCV curve do not overlap.
  • the preset voltage interval includes a first voltage subinterval and a second voltage subinterval; wherein,
  • the voltage value in the first voltage subinterval is greater than or equal to the upper limit of the hysteresis interval, and the voltage value in the second voltage subinterval is less than or equal to the lower limit of the hysteresis interval.
  • selecting a target SOC-OCV curve from the stored charge state SOC-open circuit voltage OCV curve and discharge SOC-OCV curve of the battery pack includes:
  • the target SOC-OCV curve is the charging SOC-OCV curve
  • the target SOC-OCV curve is the discharge SOC-OCV curve.
  • the target SOC-OCV curve is the charging SOC-OCV curve, including:
  • the target SOC-OCV curve is the charging SOC -OCV curve
  • the first voltage is greater than or equal to the remaining voltages among the voltages of the multiple cells.
  • the target SOC-OCV curve is a discharge SOC-OCV curve, including:
  • the target SOC-OCV curve is the discharge SOC-OCV curve
  • the second voltage is less than or equal to the remaining voltages among the voltages of the multiple cells.
  • the target SOC-OCV curve is the charge SOC-OCV curve
  • the target SOC is the charge SOC
  • the reference SOC is the first charge SOC
  • the first charge SOC is less than or equal to the remaining charge SOCs of the multiple cells Charge SOC
  • calculate the SOC difference between the target SOC of the cell and the reference SOC including:
  • the difference of the charge SOC of the cell minus the first charge SOC is taken as the SOC difference of the cell.
  • the target SOC-OCV curve is the discharge SOC-OCV curve
  • the target SOC is the discharge SOC
  • the reference SOC is the first discharge SOC
  • the first discharge SOC is less than or equal to the remaining discharge SOCs of the multiple cells Discharge SOC
  • calculate the SOC difference between the target SOC of the cell and the reference SOC including:
  • the difference of the discharge SOC of the cell minus the first discharge SOC is taken as the SOC difference of the cell.
  • calculating the equilibrium time of each cell based on the SOC difference of each cell includes:
  • the equilibrium time of each cell is obtained according to the difference in capacity of each cell and the obtained equilibrium current.
  • a battery pack balance control device including:
  • the voltage acquisition module is used to acquire the voltage of each cell among the multiple cells of the battery pack;
  • the target curve selection module is used to obtain the stored charge state SOC of the battery pack based on the voltage within the preset voltage interval if there is a voltage within the preset voltage interval among the voltages of the multiple cells -Select a target SOC-OCV curve from the open circuit voltage OCV curve and the discharge SOC-OCV curve;
  • SOC acquisition module used to obtain the target SOC of each cell based on the target SOC-OCV curve and the voltage of each cell;
  • the SOC difference calculation module is used to calculate the SOC difference between the target SOC and the reference SOC for each battery cell
  • Balance time calculation module used to calculate the balance time of each cell based on the SOC difference of each cell
  • the preset voltage interval is determined based on the hysteresis interval, and the hysteresis interval is the OCV interval corresponding to the part where the charging SOC-OCV curve and the discharging SOC-OCV curve do not overlap.
  • a battery pack balancing control device including: a processor and a memory storing computer program instructions;
  • the battery pack balance control method as provided in the embodiment of the present application is implemented.
  • a computer storage medium is provided, and computer program instructions are stored on the computer storage medium.
  • the computer program instructions are executed by a processor, the battery pack balance control method as provided in the embodiments of the present application is implemented.
  • the target SOC-OCV curve for balancing can be determined based on the voltage within the preset voltage interval, so as to achieve the target SOC-OCV curve and each The voltage of each cell, accurately calculates the equilibrium time of the cell with hysteresis.
  • FIG. 1 is a schematic flowchart of a method for controlling balance of a battery pack provided by some embodiments of the application;
  • FIG. 2 is a schematic diagram of charging SOC-OCV curve and discharging SOC-OCV curve provided by some embodiments of the application;
  • FIG. 3 is a schematic flowchart of a battery pack balance control method provided by other embodiments of the application.
  • FIG. 4 is a schematic structural diagram of a battery pack balance control device provided by an embodiment of the application.
  • Fig. 5 is a schematic structural diagram of a battery pack balancing control device according to an embodiment of the present application.
  • Fig. 1 shows a schematic flow chart of a method for controlling the balance of a battery pack according to an embodiment of the present application.
  • the method for controlling the balance of a battery pack provided by an embodiment of the present application includes the following steps:
  • S120 If there is a voltage within a preset voltage interval among the voltages of the plurality of battery cells, based on the voltage within the preset voltage interval, from the stored charge state SOC-open circuit voltage OCV curve of the battery pack Select a target SOC-OCV curve from the discharge SOC-OCV curve.
  • S130 Obtain the target SOC of each cell based on the target SOC-OCV curve and the voltage of each cell.
  • S140 For each cell, calculate the SOC difference between the target SOC and the reference SOC of the cell.
  • the charging SOC-OCV curve is the charging SOC-OCV curve of the battery pack during the charging process.
  • the discharge SOC-OCV curve is the discharge SOC-OCV curve of the battery pack during the discharge process.
  • the voltage of each cell in the battery pack involved in the embodiment of the present application is the open circuit voltage of each cell.
  • the open circuit voltage of the cell refers to the voltage of the cell in the open state, that is, the voltage difference between the two ends of the cell when no current flows in the cell.
  • the preset voltage interval is determined based on the hysteresis interval.
  • the hysteresis interval is the OCV interval corresponding to the part where the charging SOC-OCV curve and the discharging SOC-OCV curve do not overlap.
  • the OCV interval of the battery cell is divided into a hysteretic OCV interval and a non-hysteretic OCV interval.
  • Figure 2 shows the charging SOC-OCV curve and the discharging SOC-OCV curve of the battery cell.
  • the horizontal axis is the SOC of the cell
  • the vertical axis is the open circuit voltage of the cell.
  • the solid line is the charge SOC-OCV curve of the battery cell
  • the dashed line is the discharge SOC-OCV curve of the battery cell.
  • the hysteresis interval has an upper limit and a lower limit.
  • the upper limit of the hysteresis interval is the upper limit voltage A in Fig. 2
  • the lower limit of the hysteresis interval is the lower limit voltage B in Fig. 2.
  • the non-hysteresis interval is the OCV interval corresponding to the part where the charge SOC-OCV curve and the discharge SOC-OCV curve overlap.
  • the preset voltage interval includes a first voltage sub-interval and a second voltage sub-interval.
  • the voltage value in the first voltage sub-interval is greater than or equal to the upper limit of the hysteresis interval.
  • the first voltage sub-interval is [A, A'], and A'is the upper limit of the cell voltage usage interval.
  • the voltage value in the second voltage sub-interval is less than or equal to the lower limit of the hysteresis interval.
  • the second voltage sub-interval is [B', B], and B'is the lower limit of the cell voltage usage interval.
  • A'and B' are both preset voltage values.
  • the preset voltage interval includes a non-hysteresis interval, an upper limit voltage A of the hysteresis interval, and a lower limit voltage B of the hysteresis interval.
  • the target SOC-OCV curve for battery pack balancing can be determined from the charge SOC-OCV curve and the discharge SOC-OCV curve, so as to achieve The SOC-OCV curve accurately calculates the equilibrium time of cells with hysteresis.
  • step S120 if at least one of the voltages within the preset voltage interval is within the first voltage subinterval, the target SOC-OCV curve is the charging SOC-OCV curve. That is to say, in the voltage of all the cells, as long as there is a voltage greater than or equal to the upper limit of the hysteresis interval, the equilibrium information of each cell in the battery pack is calculated according to the charging SOC-OCV curve.
  • the first voltage among the voltages of the multiple cells is greater than or equal to the upper limit value, it is determined that at least one of the voltages within the preset voltage interval is within the first voltage subinterval. Wherein, the first voltage is greater than or equal to the remaining voltages among the voltages of the multiple cells. That is, the first voltage is the highest voltage among the voltages of all the cells.
  • step S120 if all the voltages within the preset voltage interval are within the second voltage sub-interval, the target SOC-OCV curve is the discharge SOC-OCV curve.
  • the battery pack is calculated according to the discharge SOC-OCV curve Balance information for each cell.
  • the second voltage among the voltages of the multiple cells is less than or equal to the lower limit, it is determined that all voltages within the preset voltage interval are equal Located within the second voltage sub-interval.
  • the second voltage is less than or equal to the remaining voltages among the voltages of the plurality of battery cells. In other words, the second voltage is the lowest voltage among the voltages of all the cells.
  • the target SOC-OCV curve is the charge SOC-OCV curve
  • the target SOC is the charge SOC
  • the reference SOC is the first charge SOC
  • the first charge SOC is less than or equal to the charge SOC of the multiple cells The remaining charge SOC in the.
  • the reference SOC is the lowest charging SOC among the charging SOCs of the plurality of battery cells.
  • the first charging SOC is the lowest charging SOC among the charging SOCs of all battery cells. Then in step S140, for each cell, the difference of the charge SOC of the cell minus the first charge SOC is taken as the SOC difference of the cell.
  • the target SOC-OCV curve is the discharge SOC-OCV curve
  • the target SOC is the discharge SOC
  • the reference SOC is the first discharge SOC
  • the first discharge SOC is less than or equal to the discharge SOC of a plurality of cells The remaining discharge SOC. That is, the first discharge SOC is the lowest discharge SOC among the discharge SOCs of the plurality of cells. As a specific example, the first discharge SOC is the lowest discharge SOC among the discharge SOCs of all the cells.
  • step S140 for each cell, the difference of the discharge SOC of the cell minus the discharge SOC corresponding to the second voltage among the voltages of the plurality of cell voltages is taken as the SOC difference of the cell.
  • FIG. 3 shows a flowchart of a method for controlling the balance of a battery pack provided by an exemplary embodiment in an embodiment of the present application.
  • first determine whether the battery pack is in an open circuit state As an example, by judging whether there is current flowing in the battery pack, it can be judged whether the battery pack is in an open circuit state. For example, if the current in the battery pack is zero, it is determined that the battery pack is in an open circuit state. If the battery pack is not in an open circuit state, it is judged again whether the battery pack is in an open circuit state every preset time period T1.
  • the open circuit voltage of each cell is obtained after the preset time period T2. Obtaining the open circuit voltage of each cell after the preset time period T2 is to obtain the stable open circuit voltage of each cell.
  • the open circuit voltage of each cell can be obtained from the cell management unit.
  • the cell management unit is used to collect the open circuit voltage of each cell.
  • the highest voltage is greater than or equal to the upper limit voltage of the hysteresis interval, it means that there is at least one voltage in the first voltage sub-interval among the voltages of all the cells, and the target SOC-OCV curve is determined to be the charging SOC-OCV curve .
  • the charging SOC corresponding to the open circuit voltage of each cell can be obtained.
  • SOC1Chrg, SOC2Chrg, SOC3Chrg, and SOC4Chrg are respectively the open circuit voltage Voltage1, open circuit voltage2, open circuit voltage Voltage3, and open circuit voltage Voltage4 corresponding to the charging SOC.
  • the difference between the charge SOC of the cell minus the lowest charge SOC is used as the SOC difference of the cell.
  • the lowest voltage is greater than the lower limit of the hysteresis interval, it means that the voltages of all the cells are within the hysteresis interval, and the cells in the battery pack are not balanced, that is, they are not processed.
  • the target SOC-OCV curve is the discharge SOC-OCV curve.
  • SOC1DisChrg, SOC2DisChrg, and SOC4DisChrg are the discharge SOCs corresponding to the open circuit voltage Voltage1, the open circuit voltage Voltage2, the open circuit voltage Voltage3, and the open circuit voltage Voltage4, respectively.
  • the discharge SOC corresponding to the open circuit voltage Voltage1 is equal to the charge SOC corresponding to the open circuit voltage Voltage1. That is, SOC1DisChrg and SOC1Chrg are equal.
  • the open circuit voltage Voltage2, open circuit voltage Voltage3, and open circuit voltage Voltage4 are within the hysteresis interval. Therefore, the charge SOC and discharge SOC corresponding to each of the open circuit voltage Voltage2, open circuit voltage Voltage3, and open circuit voltage Voltage4 are not equal.
  • the difference of the discharge SOC of the cell minus the lowest discharge SOC is used as the SOC difference of the cell.
  • the equilibrium time of each cell is calculated based on the SOC difference of each cell.
  • the capacity difference of each cell is calculated based on the SOC difference and the nominal capacity of each cell. Specifically, the capacity difference of each cell is the product of the SOC difference of the cell and the nominal capacity.
  • the equalization time of each cell is obtained.
  • the equalizing current may be a preset current, or it may be calculated by other known methods, which will not be repeated here.
  • the equalization time of each cell is the capacity difference of the cell divided by the equalization current.
  • each cell After calculating the balance time of each cell, each cell can be balanced according to the balance time of each cell.
  • the balance time of the battery cell can be calculated multiple times according to the preset requirements and according to the method of S110-S150.
  • the balance time of the cell can be calculated according to the method of S110-S150 at regular intervals.
  • the reference SOC is the lowest charge SOC or the lowest discharge SOC.
  • the reference SOC used for calculating the equilibrium time of the cell may be different each time.
  • the specific value of the reference SOC is determined by the voltage of each cell, the charging SOC-OCV curve and the discharging SOC-OCV curve obtained each time.
  • the battery pack balancing control method provided by the embodiment of the present application determines the target SOC-OCV curve for balancing based on the hysteresis interval and the voltage outside the preset voltage interval. According to the target SOC-OCV curve and the open circuit voltage of each cell, the SOC difference of each cell can be accurately obtained, and then the equilibrium time of the cell with the hysteresis effect can be accurately obtained.
  • Fig. 4 shows a schematic structural diagram of a battery pack balancing control device provided according to an embodiment of the present application.
  • the battery pack balancing control device 400 includes:
  • the voltage obtaining module 410 is used to obtain the voltage of each cell among the multiple cells of the battery pack;
  • the target curve selection module 420 is configured to, if there is a voltage within a preset voltage interval among the voltages of a plurality of battery cells, based on the voltage within the preset voltage interval, from the stored charge state of the battery pack Choose a target SOC-OCV curve from SOC-open circuit voltage OCV curve and discharge SOC-OCV curve;
  • the SOC obtaining module 430 is used to obtain the target SOC of each cell based on the target SOC-OCV curve and the voltage of each cell;
  • the SOC difference calculation module 440 is configured to calculate, for each battery cell, the SOC difference between the target SOC and the reference SOC of the battery cell;
  • the balance time calculation module 450 is used to calculate the balance time of each cell based on the SOC difference of each cell;
  • the preset voltage interval is determined based on the hysteresis interval, and the hysteresis interval is the OCV interval corresponding to the part where the charging SOC-OCV curve and the discharging SOC-OCV curve do not overlap.
  • the preset voltage interval includes a first voltage sub-interval and a second voltage sub-interval;
  • the voltage value in the first voltage subinterval is greater than or equal to the upper limit of the hysteresis interval, and the voltage value in the second voltage subinterval is less than or equal to the lower limit of the hysteresis interval.
  • the target curve selection module 420 is specifically used for:
  • the target SOC-OCV curve is the charging SOC-OCV curve
  • the target SOC-OCV curve is the discharge SOC-OCV curve.
  • the target curve selection module 420 is also specifically configured to:
  • the target SOC-OCV curve is the charging SOC -OCV curve
  • the first voltage is greater than or equal to the remaining voltages among the voltages of the multiple cells.
  • the target curve selection module 420 is also specifically configured to:
  • the target SOC-OCV curve is the discharge SOC-OCV curve
  • the second voltage is less than or equal to the remaining voltages among the voltages of the multiple cells.
  • the target SOC-OCV curve is the charge SOC-OCV curve
  • the target SOC is the charge SOC
  • the reference SOC is the first charge SOC
  • the first charge SOC is less than or equal to the charge SOC of the multiple cells
  • the difference of the charge SOC of the cell minus the first charge SOC is taken as the SOC difference of the cell.
  • the target SOC-OCV curve is the discharge SOC-OCV curve
  • the target SOC is the discharge SOC
  • the reference voltage is the first discharge SOC
  • the first discharge SOC is less than or equal to the discharge SOC of multiple cells
  • the difference of the discharge SOC of the cell minus the first discharge SOC is taken as the SOC difference of the cell.
  • the equalization time calculation module 450 is specifically configured to:
  • the equilibrium time of each cell is obtained according to the difference in capacity of each cell and the obtained equilibrium current.
  • the battery pack balancing control device selects the target SOC-OCV curve for balancing based on the hysteresis interval and the voltage outside the preset voltage interval. According to the target SOC-OCV curve and the open circuit voltage of each cell, the SOC difference of each cell can be accurately obtained, and then the equilibrium time of the cell with the hysteresis effect can be accurately obtained.
  • FIG. 5 is a schematic diagram showing a hardware structure 500 of a battery pack balancing control device according to an embodiment of the application.
  • the battery pack balancing control device 500 in this embodiment includes: a processor 501, a memory 502, a communication interface 503, and a bus 510.
  • the processor 501, the memory 502, and the communication interface 503 are connected and connected via the bus 510. Complete mutual communication.
  • the aforementioned processor 501 may include a central processing unit (CPU), or a specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.
  • CPU central processing unit
  • ASIC specific integrated circuit
  • the memory 502 may include mass storage for data or instructions.
  • the memory 502 may include an HDD, a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these.
  • the storage 502 may include removable or non-removable (or fixed) media.
  • the memory 502 may be inside or outside the battery pack balance control device 500.
  • the memory 502 is a non-volatile solid state memory.
  • the memory 502 includes read-only memory (ROM).
  • the ROM can be mask-programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), electrically rewritable ROM (EAROM) or flash memory or A combination of two or more of these.
  • the communication interface 503 is mainly used to implement communication between various modules, devices, units and/or devices in the embodiments of the present application.
  • the bus 510 includes hardware, software, or both, and couples the components of the battery pack balancing control device 500 to each other.
  • the bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industry standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnect, industry standard architecture (ISA) Bus, unlimited bandwidth interconnect, low pin count (LPC) bus, memory bus, microchannel architecture (MCA) bus, peripheral component interconnect (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology Attachment (SATA) bus, Video Electronics Standards Association Local (VLB) bus or other suitable bus or a combination of two or more of these.
  • the bus 510 may include one or more buses.
  • the battery pack balancing control device 500 shown in FIG. 5 may be implemented as including: a processor 501, a memory 502, a communication interface 503, and a bus 510.
  • the processor 501, the memory 502, and the communication interface 503 are connected through the bus 510 and complete the mutual communication.
  • the memory 502 is used to store program code; the processor 501 runs a program corresponding to the executable program code by reading the executable program code stored in the memory 502, so as to execute the battery balance control in any embodiment of the present application Method, thereby realizing the battery pack balancing control method and device described in conjunction with FIGS. 1 to 3.
  • the embodiment of the present application also provides a computer storage medium on which computer program instructions are stored; when the computer program instructions are executed by a processor, the battery pack balance control method provided in the embodiments of the present application is implemented.
  • the functional blocks shown in the above structural block diagram can be implemented as hardware, software, firmware, or a combination thereof.
  • hardware When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, and so on.
  • ASIC application specific integrated circuit
  • the elements of this application are programs or code segments used to perform required tasks.
  • the program or code segment may be stored in a machine-readable medium, or transmitted on a transmission medium or communication link through a data signal carried in a carrier wave.
  • "Machine-readable medium" may include any medium that can store or transmit information.
  • machine-readable media examples include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and so on.
  • the code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

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Abstract

一种电池组均衡控制方法、装置、设备和介质。该方法包括:获取电池组的多个电芯中每个电芯的电压(S110);若在多个电芯的电压中存在位于预设电压区间之内的电压,则基于位于预设电压区间之内的电压,从存储的电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线(S120);基于目标SOC-OCV曲线以及每个电芯的电压,获取每个电芯的目标SOC(S130);对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异(S140);基于每个电芯的SOC差异计算每个电芯的均衡时间(S150);其中,预设电压区间基于滞回区间确定。上述方法能够精确得到存在滞回效应的电芯的均衡信息。

Description

电池组均衡控制方法、装置、设备和介质
相关申请的交叉引用
本申请要求享有于2019年04月24日提交的名称为“电池组均衡控制方法、装置、设备和介质”的中国专利申请201910335092.1的优先权,该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及新能源领域,尤其涉及一种电池组均衡控制方法、装置、设备和介质。
背景技术
由于电池包中每个电芯的自放电率、初始荷电状态(State of Charge,SOC)、容量等参数具有不一致性,因此电池包的容量除了受限于容量最小的电芯之外,还会因为该不一致性无法完全发挥。为了提升电池包的可用容量,可以对电池组进行均衡。
目前电池组中电芯的均衡信息,例如是否需要对电芯均衡以及需要对电芯均衡多长时间等均衡信息,是先根据各电芯的开路电压(Open circuit voltage,OCV)以及电池组的SOC-OCV曲线确定各电芯SOC差异,然后根据每个电芯的SOC差异确定的。
但是,由于部分电芯具有滞回效应,该滞回效应是指电芯的充电OCV和放电OCV不一致,因此造成无法准确估算SOC差异,进而导致无法精确得出电芯的均衡信息。
发明内容
本申请实施例提供一种电池组均衡控制方法、装置、设备和介质,实现了精确获取存在滞回效应的电芯的均衡信息。
根据本申请实施例的一方面,提供一种电池组均衡控制方法,包括:
获取电池组的多个电芯中每个电芯的电压;
若在多个电芯的电压中存在位于预设电压区间之内的电压,则基于位于预设电压区间之内的电压,从存储的电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线;
基于目标SOC-OCV曲线以及每个电芯的电压,获取每个电芯的目标SOC;
对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异;
基于每个电芯的SOC差异计算每个电芯的均衡时间;
其中,预设电压区间基于滞回区间确定,滞回区间为充电SOC-OCV曲线和放电SOC-OCV曲线不重合的部分所对应的OCV区间。
在一个实施例中,预设电压区间包括第一电压子区间和第二电压子区间;其中,
第一电压子区间内的电压值大于等于滞回区间的上限值,第二电压子区间内的电压值小于等于滞回区间的下限值。
在一个实施例中,基于位于预设电压区间之内的电压,从存储的电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线,包括:
若位于预设电压区间之内的电压中的至少一个位于第一电压子区间之内,则目标SOC-OCV曲线为充电SOC-OCV曲线;
若所有位于预设电压区间之内的电压均位于第二电压子区间之内,则目标SOC-OCV曲线为放电SOC-OCV曲线。
在一个实施例中,若位于预设电压区间之内的电压中的至少一个位于第一电压子区间之内,则目标SOC-OCV曲线为充电SOC-OCV曲线,包括:
若多个电芯的电压中的第一电压大于等于上限值,则确定位于预设电压区间之内的电压中的至少一个位于第一电压子区间之内,目标SOC-OCV曲线为充电SOC-OCV曲线;
其中,第一电压大于等于多个电芯的电压中的其余电压。
在一个实施例中,若所有位于预设电压区间之内的电压均位于第二电压子区间之内,则目标SOC-OCV曲线为放电SOC-OCV曲线,包括:
若每个电芯的电压均小于上限值,且多个电芯的电压中的第二电压小于等于下限值,则确定所有位于预设电压区间之内的电压均位于第二电压子区间之内,目标SOC-OCV曲线为放电SOC-OCV曲线;
其中,第二电压小于等于多个电芯的电压中的其余电压。
在一个实施例中,若目标SOC-OCV曲线为充电SOC-OCV曲线,则目标SOC为充电SOC,基准SOC为第一充电SOC,第一充电SOC小于等于多个电芯的充电SOC中的其余充电SOC;
其中,对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异,包括:
对于每个电芯,将该电芯的充电SOC减去第一充电SOC的差值作为该电芯的SOC差异。
在一个实施例中,若目标SOC-OCV曲线为放电SOC-OCV曲线,则目标SOC为放电SOC,基准SOC为第一放电SOC,第一放电SOC小于等于多个电芯的放电SOC中的其余放电SOC;
其中,对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异,包括:
对于每个电芯,将该电芯的放电SOC减去第一放电SOC的差值作为该电芯的SOC差异。
在一个实施例中,基于每个电芯的SOC差异计算每个电芯的均衡时间,包括:
基于每个电芯的SOC差异和标称容量,计算每个电芯的容量差异;
按照每个电芯的容量差异和获取的均衡电流得到每个电芯的均衡时间。
根据本申请实施例的另一方面,提供一种电池组均衡控制装置,包括:
电压获取模块,用于获取电池组的多个电芯中每个电芯的电压;
目标曲线选取模块,用于若在多个电芯的电压中存在位于预设电压区间之内的电压,则基于位于预设电压区间之内的电压,从存储的电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线;
SOC获取模块,用于基于目标SOC-OCV曲线以及每个电芯的电压,获取每个电芯的目标SOC;
SOC差异计算模块,用于对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异;
均衡时间计算模块,用于基于每个电芯的SOC差异计算每个电芯的均衡时间;
其中,预设电压区间基于滞回区间确定,滞回区间为充电SOC-OCV曲线和放电SOC-OCV曲线不重合的部分所对应的OCV区间。
根据本申请实施例的再一方面,提供一种电池组均衡控制设备,包括:处理器以及存储有计算机程序指令的存储器;
处理器执行计算机程序指令时实现如本申请实施例提供的电池组均衡控制方法。
根据本申请实施例的再一方面,提供一种计算机存储介质,计算机存储介质上存储有计算机程序指令,计算机程序指令被处理器执行时实现如本申请实施例提供的电池组均衡控制方法。
根据本申请实施例中的电池组均衡控制方法、装置、设备和介质,基于位于预设电压区间内的电压可以确定用于均衡的目标SOC-OCV曲线,从而实现根据目标SOC-OCV曲线和每个电芯的电压,精确计算具有滞回效应的电芯的均衡时间。
附图说明
下面将通过参考附图来描述本申请示例性实施例的特征、优点和技术效果。
图1为本申请一些实施例提供的电池组均衡控制方法的流程示意图;
图2为本申请一些实施例提供的充电SOC-OCV曲线和放电SOC- OCV曲线的示意图;
图3为本申请另一些实施例提供的电池组均衡控制方法的流程示意图;
图4为本申请实施例提供的电池组均衡控制装置的结构示意图;
图5为根据本申请实施例的电池组均衡控制设备的结构示意图。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理,但不能用来限制本申请的范围,即本申请不限于所描述的实施例。
需要说明的是,在本文中,诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来,而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下,由语句“包括……”限定的要素,并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
为了更好的理解本申请,下面将结合附图,详细描述根据本申请实施例的电池组均衡控制方法、装置、设备和介质,应注意,这些实施例并不是用来限制本申请公开的范围。
图1示出根据本申请实施例的电池组均衡控制方法的流程示意图。如图1所示,本申请实施例提供的电池组均衡控制方法包括以下步骤:
S110,获取电池组的多个电芯中每个电芯的电压。
S120,若在多个电芯的电压中存在位于预设电压区间之内的电压,则基于位于预设电压区间之内的电压,从存储的电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线。
S130,基于目标SOC-OCV曲线以及每个电芯的电压,获取每个电芯的目标SOC。
S140,对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异。
S150,基于每个电芯的SOC差异计算每个电芯的均衡时间。
在本申请的实施例中,充电SOC-OCV曲线为电池组在充电过程中的充电SOC-OCV曲线。放电SOC-OCV曲线为电池组在放电过程中的放电SOC-OCV曲线。
需要说明的是,本申请实施例涉及的电池组中每个电芯的电压均为每个电芯的开路电压。其中,电芯的开路电压是指电芯在开路状态下的电压,即为电芯中没有电流流过时电芯两端的压差。
在本申请的实施例中,预设电压区间基于滞回区间确定。滞回区间为充电SOC-OCV曲线和放电SOC-OCV曲线不重合的部分所对应的OCV区间。
下面结合具体示例说明滞回区间。在本申请的实施例中,将电芯的OCV区间划分为滞回OCV区间和非滞回OCV区间。图2中示出电芯的充电SOC-OCV曲线和放电SOC-OCV曲线。其中,横轴为电芯的SOC,纵轴为电芯的开路电压。实线为电芯的充电SOC-OCV曲线,虚线为电芯的放电SOC-OCV曲线。
如图2所示,滞回区间具有上限值和下限值。滞回区间的上限值即为图2中的上限电压A,滞回区间的下限值即为图2中的下限电压B。非滞回区间为充电SOC-OCV曲线和放电SOC-OCV曲线重合的部分所对应的OCV区间。
在本申请的实施例中,预设电压区间包括第一电压子区间和第二电压子区间。其中,第一电压子区间内的电压值大于等于滞回区间的上限值。也就是说,第一电压子区间为[A,A’],A’为电芯电压使用区间上限值。第二电压子区间内的电压值小于等于滞回区间的下限值。也就是说,第二电压子区间为[B’,B],B’为电芯电压使用区间下限值。其中,A’和B’均为预设的电压值。
换句话说,预设电压区间包括非滞回区间、滞回区间的上限电压A和滞回区间的下限电压B。
在本申请的实施例中,基于位于预设电压区间之内的电压,可以从充电SOC-OCV曲线和放电SOC-OCV曲线中确定用于电池组均衡的目标SOC-OCV曲线,从而实现根据目标SOC-OCV曲线准确地计算具有滞回效应的电芯的均衡时间。
在本申请的实施例中,在步骤S120中,若位于预设电压区间之内的电压中的至少一个位于第一电压子区间之内,则目标SOC-OCV曲线为充电SOC-OCV曲线。也就是说,在所有电芯的电压中,只要存在大于等于滞回区间上限值的电压,则按照充电SOC-OCV曲线计算电池组中每个电芯的均衡信息。
在一些具体示例中,若多个电芯的电压中的第一电压大于等于上限值,则确定位于预设电压区间之内的电压中的至少一个位于第一电压子区间之内。其中,第一电压大于等于多个电芯的电压中的其余电压。也就是说,第一电压是所有电芯的电压中的最高电压。
在步骤S120中,若所有位于预设电压区间之内的电压均位于第二电压子区间之内,则目标SOC-OCV曲线为放电SOC-OCV曲线。也就是说,在所有电芯的电压中,若不存在大于等于滞回区间上限值的电压,但存在小于等于滞回区间下限值的电压,则按照放电SOC-OCV曲线计算电池组中每个电芯的均衡信息。
在一些具体示例中,若每个电芯的电压均小于上限值,且多个电芯的电压中的第二电压小于等于下限值,则确定所有位于预设电压区间之内的电压均位于第二电压子区间之内。第二电压小于等于多个电芯的电压中的其余电压。也就是说,第二电压是所有电芯的电压中的最低电压。
在本申请的实施例中,若每个电芯的电压均小于滞回区间的上限值且大于滞回区间的上限值,则不对电池组进行均衡处理。
在本申请的一些实施例中,若目标SOC-OCV曲线为充电SOC-OCV曲线,则目标SOC为充电SOC,基准SOC为第一充电SOC,第一充电SOC小于等于多个电芯的充电SOC中的其余充电SOC。也就是说,基准 SOC为多个电芯的充电SOC中的最低充电SOC。作为一个具体示例,第一充电SOC为所有电芯的充电SOC中的最低充电SOC。则在步骤S140中,对于每个电芯,将该电芯的充电SOC减去第一充电SOC的差值作为该电芯的SOC差异。
在本申请的一些实施例中,目标SOC-OCV曲线为放电SOC-OCV曲线,则目标SOC为放电SOC,基准SOC为第一放电SOC,第一放电SOC小于等于多个电芯的放电SOC中的其余放电SOC。也就是说,第一放电SOC是多个电芯的放电SOC中的最低放电SOC。作为一个具体示例,第一放电SOC为所有电芯的放电SOC中的最低放电SOC。则在步骤S140中,对于每个电芯,将该电芯的放电SOC减去多个电芯的电压中的第二电压对应的放电SOC的差值作为该电芯的SOC差异。
下面将结合具体示例介绍如何基于目标SOC-OCV曲线确定电池组中每个电芯的均衡信息。
图3示出本申请实施例中示例性实施例提供的电池组均衡控制方法的流程图。如图3所示,首先判断电池组是否处于开路状态。作为一个示例,通过判断电池组中是否有电流流过,以判断电池组是否处于开路状态。比如,若电池组中的电流为零,则确定电池组处于开路状态。若电池组不处于开路状态,则每隔预设时间段T1再次判断电池组是否处于开路状态。
若确定电池组处于开路状态,则在预设时间段T2之后获取每个电芯的开路电压。在预设时间段T2之后再获取每个电芯的开路电压,是为了获取每个电芯的稳定开路电压。
在一些示例中,可以从电芯管理单元处获取每个电芯的开路电压。电芯管理单元用于采集每个电芯的开路电压。
当获取每个电芯的开路电压之后,首先确定在所有电芯的电压中的最高电压,然后判断最高电压是否大于等于滞回区间的上限电压。
(一)若最高电压大于等于滞回区间的上限电压,则代表在所有电芯的电压中存在至少一个位于第一电压子区间内的电压,则确定目标SOC-OCV曲线为充电SOC-OCV曲线。
当确定目标SOC-OCV曲线为充电SOC-OCV曲线之后,首先基于电池组的充电SOC-OCV曲线以及每个电芯的开路电压,可以得到每个电芯的开路电压对应的充电SOC。作为一个示例,参见图2,SOC1Chrg,SOC2Chrg,SOC3Chrg,SOC4Chrg分别为开路电压Voltage1,开路电压Voltage2,开路电压Voltage3,开路电压Voltage4对应的充电SOC。
对于每个电芯,将该电芯的充电SOC减去最低充电SOC的差值作为该电芯的SOC差异。
(二)若最高电压小于滞回区间的上限值,则判断在所有电芯的电压中的最低电压是否小于等于滞回区间的下限值。
若最低电压大于滞回区间的下限值,则代表所有电芯的电压均位于滞回区间之内,则不对电池组中的电芯进行均衡,即不处理。
若最低电压小于等于滞回区间的下限值,则目标SOC-OCV曲线为放电SOC-OCV曲线。
当确定目标SOC-OCV曲线为放电SOC-OCV曲线之后,首先基于放电SOC-OCV曲线以及每个电芯的电压,得到每个电芯的电压对应的放电SOC。作为一个示例,参见图2,SOC1DisChrg,SOC2DisChrg,SOC4DisChrg分别为开路电压Voltage1,开路电压Voltage2,开路电压Voltage3,开路电压Voltage4对应的放电SOC。
参见图2,由于开路电压Voltage1位于滞回区间之外,因此开路电压Voltage1对应的放电SOC与开路电压Voltage1对应的充电SOC相等。即SOC1DisChrg与SOC1Chrg相等。而开路电压Voltage2、开路电压Voltage3和开路电压Voltage4在滞回区间之内,因此开路电压Voltage2、开路电压Voltage3和开路电压Voltage4中的每个开路电压所对应的充电SOC和放电SOC均不相等。
对于每个电芯,将该电芯的放电SOC减去最低放电SOC的差值作为该电芯的SOC差异。
在本申请的实施例中,当根据目标SOC-OCV曲线以及每个电芯的电压计算出每个电芯的SOC差异之后,基于每个电芯的SOC差异计算每个电芯的均衡时间。
在一些示例中,基于每个电芯的SOC差异和标称容量,计算每个电芯的容量差异。具体地,每个电芯的容量差异为该电芯的SOC差异与标称容量的乘积。
接着,按照每个电芯的容量差异和获取的均衡电流得到每个电芯的均衡时间。其中,均衡电流可以是预设的电流,也可以通过其他已知方式计算得到,在此不再赘述。作为一个示例,每个电芯的均衡时间为该电芯的容量差异除以均衡电流。
当计算出每个电芯的均衡时间后,可以按照每个电芯的均衡时间对每个电芯进行均衡。
在本申请的实施例中,可以根据预设需求,按照S110-S150的方法对电芯的均衡时间多次进行计算。比如,可以每隔固定的时间段按照S110-S150的方法对电芯的均衡时间进行计算。
需要说明的是,在一次均衡时间的计算中,基准SOC为最低充电SOC或最低放电SOC。
在一些示例中,每次计算电芯的均衡时间所利用的基准SOC可以不同。基准SOC的具体取值由每次获取的每个电芯的电压、充电SOC-OCV曲线以及放电SOC-OCV曲线确定。
本申请实施例提供的电池组均衡控制方法,通过基于滞回区间以及位于预设电压区间之外的电压,确定用于均衡的目标SOC-OCV曲线。根据目标SOC-OCV曲线以及每个电芯的开路电压可以精确地得出每个电芯的SOC差异,进而可以精确地得出存在滞回效应的电芯的均衡时间。
图4示出了根据本申请实施例提供的电池组均衡控制装置的结构示意图。如图4所示,电池组均衡控制装置400包括:
电压获取模块410,用于获取电池组的多个电芯中每个电芯的电压;
目标曲线选取模块420,用于若在多个电芯的电压中存在位于预设电压区间之内的电压,则基于位于预设电压区间之内的电压,从存储的电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线;
SOC获取模块430,用于基于目标SOC-OCV曲线以及每个电芯的电压,获取每个电芯的目标SOC;
SOC差异计算模块440,用于对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异;
均衡时间计算模块450,用于基于每个电芯的SOC差异计算每个电芯的均衡时间;
其中,预设电压区间基于滞回区间确定,滞回区间为充电SOC-OCV曲线和放电SOC-OCV曲线不重合的部分所对应的OCV区间。
在本申请的实施例中,预设电压区间包括第一电压子区间和第二电压子区间;其中,
第一电压子区间内的电压值大于等于滞回区间的上限值,第二电压子区间内的电压值小于等于滞回区间的下限值。
在本申请的实施例中,目标曲线选取模块420,具体用于:
若位于预设电压区间之内的电压中的至少一个位于第一电压子区间之内,则目标SOC-OCV曲线为充电SOC-OCV曲线;
若所有位于预设电压区间之内的电压均位于第二电压子区间之内,则目标SOC-OCV曲线为放电SOC-OCV曲线。
在本申请的实施例中,目标曲线选取模块420,还具体用于:
若多个电芯的电压中的第一电压大于等于上限值,则确定位于预设电压区间之内的电压中的至少一个位于第一电压子区间之内,目标SOC-OCV曲线为充电SOC-OCV曲线;
其中,第一电压大于等于多个电芯的电压中的其余电压。
在本申请的实施例中,目标曲线选取模块420,还具体用于:
若每个电芯的电压均小于上限值,且多个电芯的电压中的第二电压小于等于下限值,则确定所有位于预设电压区间之内的电压均位于第二电压子区间之内,目标SOC-OCV曲线为放电SOC-OCV曲线;
其中,第二电压小于等于多个电芯的电压中的其余电压。
在本申请的实施例中,若目标SOC-OCV曲线为充电SOC-OCV曲线,则目标SOC为充电SOC,基准SOC为第一充电SOC,第一充电SOC 小于等于多个电芯的充电SOC中的其余充电SOC,则SOC差异计算模块440具体用于:
对于每个电芯,将该电芯的充电SOC减去第一充电SOC的差值作为该电芯的SOC差异。
在本申请的实施例中,若目标SOC-OCV曲线为放电SOC-OCV曲线,则目标SOC为放电SOC,基准电压为第一放电SOC,第一放电SOC小于等于多个电芯的放电SOC中的其余放电SOC,则SOC差异计算模块440具体用于:
对于每个电芯,将该电芯的放电SOC减去第一放电SOC的差值作为该电芯的SOC差异。
在本申请的实施例中,均衡时间计算模块450具体用于:
基于每个电芯的SOC差异和标称容量,计算每个电芯的容量差异;
按照每个电芯的容量差异和获取的均衡电流得到每个电芯的均衡时间。
本申请实施例提供的电池组均衡控制装置,基于滞回区间以及位于预设电压区间之外的电压,选取了用于均衡的目标SOC-OCV曲线。根据目标SOC-OCV曲线以及每个电芯的开路电压可以精确地得出每个电芯的SOC差异,进而可以精确地得出存在滞回效应的电芯的均衡时间。
根据本申请实施例的电池组均衡控制装置的其他细节与以上结合图1-图3描述的根据本申请实施例的方法类似,在此不再赘述。
结合图1至图4描述的根据本申请实施例的电池组均衡控制方法和装置可以由电池组均衡控制设备来实现。图5是示出根据申请实施例的电池组均衡控制设备的硬件结构500示意图。
如图5所示,本实施例中的电池组均衡控制设备500包括:处理器501、存储器502、通信接口503和总线510,其中,处理器501、存储器502、通信接口503通过总线510连接并完成相互间的通信。
具体地,上述处理器501可以包括中央处理器(CPU),或者特定集成电路(ASIC),或者可以被配置成实施本申请实施例的一个或多个集成电路。
存储器502可以包括用于数据或指令的大容量存储器。举例来说而非限制,存储器502可包括HDD、软盘驱动器、闪存、光盘、磁光盘、磁带或通用串行总线(USB)驱动器或者两个或更多个以上这些的组合。在合适的情况下,存储器502可包括可移除或不可移除(或固定)的介质。在合适的情况下,存储器502可在电池组均衡控制设备500的内部或外部。在特定实施例中,存储器502是非易失性固态存储器。在特定实施例中,存储器502包括只读存储器(ROM)。在合适的情况下,该ROM可以是掩模编程的ROM、可编程ROM(PROM)、可擦除PROM(EPROM)、电可擦除PROM(EEPROM)、电可改写ROM(EAROM)或闪存或者两个或更多个以上这些的组合。
通信接口503,主要用于实现本申请实施例中各模块、装置、单元和/或设备之间的通信。
总线510包括硬件、软件或两者,将电池组均衡控制设备500的部件彼此耦接在一起。举例来说而非限制,总线可包括加速图形端口(AGP)或其他图形总线、增强工业标准架构(EISA)总线、前端总线(FSB)、超传输(HT)互连、工业标准架构(ISA)总线、无限带宽互连、低引脚数(LPC)总线、存储器总线、微信道架构(MCA)总线、外围组件互连(PCI)总线、PCI-Express(PCI-X)总线、串行高级技术附件(SATA)总线、视频电子标准协会局部(VLB)总线或其他合适的总线或者两个或更多个以上这些的组合。在合适的情况下,总线510可包括一个或多个总线。尽管本申请实施例描述和示出了特定的总线,但本申请考虑任何合适的总线或互连。
也就是说,图5所示的电池组均衡控制设备500可以被实现为包括:处理器501、存储器502、通信接口503和总线510。处理器501、存储器502和通信接口503通过总线510连接并完成相互间的通信。存储器502用于存储程序代码;处理器501通过读取存储器502中存储的可执行程序代码来运行与可执行程序代码对应的程序,以用于执行本申请任一实施例中的电池组均衡控制方法,从而实现结合图1至图3描述的电池组均衡控制方法和装置。
本申请实施例还提供一种计算机存储介质,该计算机存储介质上存储 有计算机程序指令;该计算机程序指令被处理器执行时实现本申请实施例提供的电池组均衡控制方法。
需要明确的是,本申请并不局限于上文所描述并在图中示出的特定配置和处理。为了简明起见,这里省略了对已知方法的详细描述。在上述实施例中,描述和示出了若干具体的步骤作为示例。但是,本申请的方法过程并不限于所描述和示出的具体步骤,本领域的技术人员可以在领会本申请的精神后,作出各种改变、修改和添加,或者改变步骤之间的顺序。
以上的结构框图中所示的功能块可以实现为硬件、软件、固件或者它们的组合。当以硬件方式实现时,其可以例如是电子电路、专用集成电路(ASIC)、适当的固件、插件、功能卡等等。当以软件方式实现时,本申请的元素是被用于执行所需任务的程序或者代码段。程序或者代码段可以存储在机器可读介质中,或者通过载波中携带的数据信号在传输介质或者通信链路上传送。“机器可读介质”可以包括能够存储或传输信息的任何介质。机器可读介质的例子包括电子电路、半导体存储器设备、ROM、闪存、可擦除ROM(EROM)、软盘、CD-ROM、光盘、硬盘、光纤介质、射频(RF)链路,等等。代码段可以经由诸如因特网、内联网等的计算机网络被下载。
还需要说明的是,本申请中提及的示例性实施例,基于一系列的步骤或者装置描述一些方法或系统。但是,本申请不局限于上述步骤的顺序,也就是说,可以按照实施例中提及的顺序执行步骤,也可以不同于实施例中的顺序,或者若干步骤同时执行。
以上,仅为本申请的具体实施方式,所属领域的技术人员可以清楚地了解到,为了描述的方便和简洁,上述描述的系统、模块和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。
虽然已经参考优选实施例对本申请进行了描述,但在不脱离本申请的范围的情况下,可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是,只要不存在结构冲突,各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例,而是包括落入权利要求的范围内的所有技术方案。

Claims (11)

  1. 一种电池组均衡控制方法,其中,所述方法包括:
    获取电池组的多个电芯中每个电芯的电压;
    若在所述多个电芯的电压中存在位于预设电压区间之内的电压,则基于位于所述预设电压区间之内的电压,从存储的所述电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线;
    基于所述目标SOC-OCV曲线以及每个电芯的电压,获取每个电芯的目标SOC;
    对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异;
    基于每个电芯的SOC差异计算每个电芯的均衡时间;
    其中,所述预设电压区间基于滞回区间确定,所述滞回区间为所述充电SOC-OCV曲线和所述放电SOC-OCV曲线不重合的部分所对应的OCV区间。
  2. 根据权利要求1所述的方法,其中,所述预设电压区间包括第一电压子区间和第二电压子区间;其中,
    所述第一电压子区间内的电压值大于等于所述滞回区间的上限值,所述第二电压子区间内的电压值小于等于所述滞回区间的下限值。
  3. 根据权利要求2所述的方法,其中,所述基于位于所述预设电压区间之内的电压,从存储的所述电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线,包括:
    若位于所述预设电压区间之内的电压中的至少一个位于所述第一电压子区间之内,则所述目标SOC-OCV曲线为所述充电SOC-OCV曲线;
    若所有位于所述预设电压区间之内的电压均位于所述第二电压子区间之内,则所述目标SOC-OCV曲线为所述放电SOC-OCV曲线。
  4. 根据权利要求3所述的方法,其中,所述若位于所述预设电压区间之内的电压中的至少一个位于所述第一电压子区间之内,则所述目标SOC-OCV曲线为所述充电SOC-OCV曲线,包括:
    若所述多个电芯的电压中的第一电压大于等于所述上限值,则确定位于所述预设电压区间之内的电压中的至少一个位于所述第一电压子区间之内,所述目标SOC-OCV曲线为所述充电SOC-OCV曲线;
    其中,所述第一电压大于等于所述多个电芯的电压中的其余电压。
  5. 根据权利要求3所述的方法,其中,所述若所有位于所述预设电压区间之内的电压均位于所述第二电压子区间之内,则所述目标SOC-OCV曲线为所述放电SOC-OCV曲线,包括:
    若每个电芯的电压均小于所述上限值,且所述多个电芯的电压中的第二电压小于等于所述下限值,则确定所有位于所述预设电压区间之内的电压均位于所述第二电压子区间之内,所述目标SOC-OCV曲线为所述放电SOC-OCV曲线;
    其中,所述第二电压小于等于所述多个电芯的电压中的其余电压。
  6. 根据权利要求1所述的方法,其中,若所述目标SOC-OCV曲线为所述充电SOC-OCV曲线,则所述目标SOC为充电SOC,所述基准SOC为第一充电SOC,所述第一充电SOC小于等于所述多个电芯的充电SOC中的其余充电SOC;
    其中,所述对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异,包括:
    对于每个电芯,将该电芯的充电SOC减去所述第一充电SOC的差值作为该电芯的SOC差异。
  7. 根据权利要求1所述的方法,其中,若所述目标SOC-OCV曲线为所述放电SOC-OCV曲线,则所述目标SOC为放电SOC,所述基准SOC为第一放电SOC,所述第一放电SOC小于等于所述多个电芯的放电SOC中的其余放电SOC;
    其中,所述对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异,包括:
    对于每个电芯,将该电芯的放电SOC减去所述第一放电SOC的差值作为该电芯的SOC差异。
  8. 根据权利要求1所述的方法,其中,所述基于每个电芯的SOC差异计算每个电芯的均衡时间,包括:
    基于每个电芯的SOC差异和标称容量,计算每个电芯的容量差异;
    按照每个电芯的容量差异和获取的均衡电流得到每个电芯的均衡时间。
  9. 一种电池组均衡控制装置,其中,所述装置包括:
    电压获取模块,用于获取电池组的多个电芯中每个电芯的电压;
    目标曲线选取模块,用于若在所述多个电芯的电压中存在位于预设电压区间之内的电压,则基于位于所述预设电压区间之内的电压,从存储的所述电池组的充电荷电状态SOC-开路电压OCV曲线和放电SOC-OCV曲线中选取一个目标SOC-OCV曲线;
    SOC获取模块,用于基于所述目标SOC-OCV曲线以及每个电芯的电压,获取每个电芯的目标SOC;
    SOC差异计算模块,用于对于每个电芯,计算该电芯的目标SOC与基准SOC之间的SOC差异;
    均衡时间计算模块,用于基于每个电芯的SOC差异计算每个电芯的均衡时间;
    其中,所述预设电压区间基于所述滞回区间确定,所述滞回区间为所述充电SOC-OCV曲线和所述放电SOC-OCV曲线不重合的部分所对应的OCV区间。
  10. 一种电池组均衡控制设备,其中,所述设备包括:处理器以及存储有计算机程序指令的存储器;
    所述处理器执行所述计算机程序指令时实现如权利要求1-8任意一项所述的电池组均衡控制方法。
  11. 一种计算机存储介质,其中,所述计算机存储介质上存储有计算机程序指令,所述计算机程序指令被处理器执行时实现如权利要求1-8任意一项所述的电池组均衡控制方法。
PCT/CN2020/085656 2019-04-24 2020-04-20 电池组均衡控制方法、装置、设备和介质 WO2020216185A1 (zh)

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