A method and device for equalizing the amount of electricity in an energy storage battery

Abstract

The present invention provides a method and device for equalizing the quantity of energy storage batteries. Different equalizing strategies can be selected according to the charging state of the battery to ensure that the equalizing operation can be effectively performed under different charging states, thereby enhancing the ability of the battery management system to cope with different working conditions. The method and device include the following steps: collecting the voltage and the charging and discharging current of the battery cell; judging whether it is in the charging process, and if so, calculating the equalizing voltage difference and the equalizing threshold value to determine the battery cell that needs to be equalized; judging whether the collected maximum battery cell voltage reaches the full mark or whether there is a large current charging, and if so, performing equalization based on the voltage difference; otherwise, for the battery cells whose voltage is greater than the equalizing threshold value, respectively searching the voltage ampere-hour data table to obtain the ampere-hour corresponding to the battery cell voltage, and converting the equalization time for each battery cell based on the ampere-hour and the equalization execution capability; and performing passive equalization discharge on each battery cell according to the obtained equalization time.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a method and device for equalizing the amount of electricity used in energy storage batteries. Background Art

[0002] Battery pack balancing refers to monitoring the voltage differences of each battery cell during the operation of the battery pack and adjusting the voltage of the battery cell in real time to keep it consistent. This balancing method can effectively extend the service life of the battery pack and improve its performance and safety.

[0003] In the prior art, voltage difference-based equalization is usually used. The battery management system (BMS) monitors the voltage of each cell in the battery pack in real time and calculates the voltage difference between each cell and the average voltage of the battery pack. The larger the voltage difference, the greater the voltage difference between the cell and other cells, and more equalization operations are required.

[0004] Based on the size of the voltage difference, the BMS will determine the balancing strategy for each cell. Usually, cells with larger voltage differences will be prioritized for balancing. Balancing strategies can be divided into:

[0005] Passive balancing: The excess charge is consumed through resistance to reduce the cell voltage.

[0006] Active balancing: Transferring charge from cells with higher voltage to cells with lower voltage by transferring energy.

[0007] However, when some cells in the battery pack are fully charged, the voltage of all fully charged cells will usually approach or reach their maximum voltage value. In this case, the voltage difference-based balancing method will not be able to be effectively executed, and the system will stop charging based on safety. The voltage of all cells will drop back and fail to reach the balancing condition. The actual cell voltage imbalance found before full charging will not be able to be balanced. Summary of the invention

[0008] In view of the above problems, the present invention provides a method and device for energy storage battery power balancing, which can select different balancing strategies according to the charging state of the battery, ensure that the balancing operation can be effectively performed under different charging states, and enhance the ability of the battery management system to cope with different working conditions.

[0009] The technical solution is as follows: a method for equalizing the amount of electricity used in an energy storage battery, comprising the following steps:

[0010] Collect the voltage and charge and discharge current of all battery cells respectively;

[0011] Determine whether it is in the charging process, if so, calculate the equalization voltage difference, calculate the equalization threshold value based on the equalization voltage difference and the minimum voltage of the battery, and determine the battery cell that needs to be equalized according to the equalization threshold value;

[0012] Determine whether the maximum cell voltage collected has reached the full mark or whether there is high current charging. If it has not reached the full mark and / or there is high current charging, balance is performed based on the voltage difference.

[0013] If the full charge mark is reached and / or there is no high current charging, then for the cells whose voltage is greater than the equalization threshold, the voltage ampere-hour data table is searched respectively to obtain the ampere-hour corresponding to the cell voltage, wherein the voltage ampere-hour data table is obtained based on the voltage-capacity curve of the cell;

[0014] Calculate the balancing time for each cell based on the ampere-hours and balancing execution capability;

[0015] According to the obtained balancing time, each battery cell is passively balanced and discharged.

[0016] Furthermore, the method further comprises the following steps: before the equalization time ends, always maintaining the passive equalization discharge.

[0017] Furthermore, the balanced pressure difference is calculated according to the following formula:

[0018] Balanced voltage difference = 10mV + Vp*I

[0019] Where I is the charging current and Vp is the voltage difference coefficient set according to the battery cell specifications.

[0020] Furthermore, the balance threshold is calculated according to the following formula:

[0021] Balance threshold = minV + balance pressure difference

[0022] Among them, minV is the minimum voltage of all cells collected;

[0023] For the calculated equalization threshold, it is determined whether the equalization threshold is less than the threshold value. If the equalization threshold is less than the threshold value, the equalization threshold is set to the threshold value; otherwise, the equalization threshold is kept to be the original value obtained by calculation.

[0024] Furthermore, when balancing is performed based on the pressure difference, the balancing methods adopted include active balancing and passive balancing.

[0025] Furthermore, the equilibrium time is obtained by the following formula:

[0026] Balance time = ampere-time difference / average balance current

[0027] Among them, the average balancing current is determined by the balancing execution capability of the battery, and the ampere-hour difference is the difference between the ampere-hour corresponding to the cell voltage and the ampere-hour corresponding to the balancing threshold.

[0028] Furthermore, for the obtained balancing time, it is determined whether 0<balancing time≤12 is satisfied, in hours. If the balancing time is less than 0, balancing is not performed. If the balancing time is greater than 12 hours, balancing is performed based on 12 hours.

[0029] Furthermore, after collecting the voltages of all the cells of the battery, the following steps are performed:

[0030] Collect temperature information of the balancing module;

[0031] Determine whether the temperature of the balancing module exceeds the safety threshold. If so, stop balancing; otherwise, determine whether to start balancing based on the collected battery cell voltage.

[0032] A power balancing device for an energy storage battery comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, the power balancing method for an energy storage battery as described above is implemented.

[0033] A computer-readable storage medium stores a program thereon, characterized in that when the program is executed by a processor, the method for equalizing the amount of electricity used in an energy storage battery as described above is implemented.

[0034] A computer program product comprises a computer program / instruction, wherein the computer program / instruction implements the steps of the above method when executed by a processor.

[0035] The method for equalizing the electric quantity of an energy storage battery of the present invention calculates an equalizing threshold value based on an equalizing voltage difference and a minimum voltage of the battery, determines a battery cell that needs to be equalized according to the equalizing threshold value, searches a voltage ampere-hour data table through the equalizing threshold value, obtains the ampere-hour corresponding to the battery cell voltage, converts the equalizing time for each battery cell based on the voltage-ampere-hour and the equalizing execution capability, and then performs delayed equalization based on the equalizing time. The method of the present invention breaks through the limitations of the traditional equalization method based on the voltage difference, performs delayed equalization on the battery cell when the battery is fully charged and / or only charged with current, and improves the problem that the voltage difference between the battery cells is difficult to adjust after the battery pack is fully charged; in the present invention, by setting the equalization time separately, the independent management of each battery cell is realized, and the problem of over-discharge that may occur in the traditional method is avoided. By accurately controlling the equalization between the battery cells, the performance degradation caused by overcharging or undercharging of individual battery cells is reduced, and the service life of the entire battery pack is extended.

[0036] By adopting the method of the present invention, different balancing strategies can be selected according to the charging state of the battery. By performing balancing based on pressure difference or delayed balancing based on balancing time, it is ensured that balancing operations can be effectively performed under different charging states, thereby enhancing the ability of the battery management system to cope with different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the steps of a method for equalizing the electric quantity of an energy storage battery in one embodiment;

[0038] Figure 2 is a schematic diagram of steps of a method for equalizing electric power of an energy storage battery in another embodiment;

[0039] Figure 3 is a schematic diagram of specific steps of step 6B in another embodiment;

[0040] Figure 4 FIG. 1 is a diagram showing the internal structure of a power equalization device for an energy storage battery in one embodiment. DETAILED DESCRIPTION

[0041] See Figure 1 , a method for equalizing the amount of electricity used in an energy storage battery of the present invention comprises the following steps:

[0042] Step 1: Collect the voltage and charge and discharge current of all battery cells respectively;

[0043] Step 2: Determine whether it is in the charging process. If so, calculate the equalization voltage difference, calculate the equalization threshold based on the equalization voltage difference and the minimum voltage of the battery, and determine the battery cell that needs to be equalized according to the equalization threshold;

[0044] Step 3: Determine whether the maximum cell voltage collected has reached the full charge mark or whether there is a large current charge;

[0045] Step 4A: If the full charge mark is not reached and / or there is a large current charge, equalization is performed based on the voltage difference;

[0046] Step 4B: If the full charge mark is reached and / or there is no high current charging, balance based on the balance time;

[0047] Wherein step 4B specifically comprises the following steps:

[0048] Step 4B-1: for the cells whose voltage is greater than the equalization threshold, respectively search the voltage ampere-hour data table to obtain the ampere-hour corresponding to the cell voltage, where the voltage ampere-hour data table is obtained based on the voltage-capacity curve of the cell;

[0049] Step 4B-2: Calculate the balancing time for each cell based on the ampere-hours and the balancing execution capability;

[0050] Step 4B-3: Perform passive balanced discharge on each battery cell according to the obtained balanced time.

[0051] In an embodiment, different balancing strategies can be selected according to the charging state of the battery. By performing balancing based on voltage difference or delayed balancing based on balancing time, it is ensured that balancing operations can be effectively performed under different charging states, thereby enhancing the ability of the battery management system to cope with different working conditions. By continuously performing passive balancing discharge, it is ensured that the voltage of the battery cell is effectively adjusted within the balancing time.

[0052] See Figure 2 In one embodiment, the method is performed as follows:

[0053] Step 1: Collect the voltage and charge and discharge current of all battery cells respectively;

[0054] Step 2: Collect temperature information of the balancing module;

[0055] Step 3: Determine whether the temperature of the balancing module exceeds the safety threshold. If so, stop balancing. Otherwise, determine whether to start balancing based on the collected cell voltage. Otherwise, end balancing.

[0056] Step 4: Determine whether it is in the charging process. If so, calculate the equalization voltage difference, calculate the equalization threshold based on the equalization voltage difference and the minimum voltage of the battery, and determine the battery cell that needs to be equalized according to the equalization threshold. Otherwise, end the equalization.

[0057] Step 5: Determine whether the maximum cell voltage collected has reached the full charge mark or whether there is a large current charge;

[0058] Step 6A: If the full charge mark is not reached and / or there is a large current charge, equalization is performed based on the voltage difference;

[0059] Step 6B: If the full charge mark is reached and / or there is no high current charging, perform balancing based on the balancing time.

[0060] See Figure 3 , wherein step 6B specifically includes the following steps:

[0061] Step 6B-1: for the cells whose voltage is greater than the equalization threshold, respectively search the voltage ampere-hour data table to obtain the ampere-hour corresponding to the cell voltage, where the voltage ampere-hour data table is obtained based on the voltage-capacity curve of the cell;

[0062] Step 6B-2: Calculate the balancing time for each cell based on the ampere-hours and the balancing execution capability;

[0063] Step 6B-3: Perform passive balanced discharge on each cell according to the obtained balanced time, and keep the passive balanced discharge before the balanced time ends.

[0064] The prior art usually only relies on voltage differences for balancing operations, but cannot be effectively performed after the battery is fully charged. In the embodiments, the temperature of the balancing module is monitored in real time to ensure that the balancing operation is performed within a safe temperature range. The balancing threshold is calculated based on the balancing voltage difference and the minimum voltage of the battery, and the battery cells that need to be balanced are determined according to the balancing threshold. The voltage ampere-hour data table is searched through the balancing threshold to obtain the ampere-hour corresponding to the battery cell voltage. The balancing time is converted for each battery cell based on the voltage-ampere-hour and the balancing execution capability, and then delayed balancing can be performed based on the balancing time. After the battery is fully charged, the balancing operation can still be performed based on the voltage and ampere-hour difference of the battery cell to ensure the balanced state of the battery pack.

[0065] Specifically in the embodiment, in step 1, it is necessary to collect the voltages and the charge and discharge currents of all the cells in the energy storage battery respectively, wherein the maximum voltage in the cell is recorded as maxV, and the minimum voltage in the cell is recorded as minV.

[0066] In step 2, temperature information of the balancing module is collected;

[0067] In step 3, it is determined whether the temperature of the balancing module exceeds the safety threshold. If so, the balancing is stopped; otherwise, it is determined whether to start the balancing according to the collected voltage of the battery cell. By real-time monitoring of the voltage and current of the battery cell and the temperature of the balancing module, the balancing strategy is dynamically adjusted to ensure that the balancing operation is performed within a safe range. The prior art generally lacks real-time monitoring and control of the temperature of the balancing module, which may cause safety problems caused by overheating. In the embodiment, by introducing temperature monitoring, the temperature change can be detected in real time. Once it is found that the temperature exceeds the safety threshold, the balancing operation is stopped, which effectively avoids the safety hazards caused by overheating. The value of the safety threshold can be set according to the actual situation;

[0068] Step 4: Determine whether it is in the charging process. If so, calculate the equalization voltage difference, calculate the equalization threshold based on the equalization voltage difference and the minimum voltage of the battery, and determine the battery cell that needs to be equalized according to the equalization threshold;

[0069] Among them, the balanced pressure difference is calculated according to the following formula:

[0070] Balanced voltage difference = 10mV + 5mV * I

[0071] Where, I is the charging current; 10mV is the minimum voltage difference that must be achieved, and 5mV*I takes into account that the charging current has different effects on the voltage of cells in different voltage platform areas. The larger the current, the greater the difference. The larger the cell voltage, the greater the difference. This is determined by the cell characteristics and the open circuit voltage curve.

[0072] The balance threshold is calculated according to the following formula:

[0073] Balance threshold = minV + balance pressure difference

[0074] Among them, minV is the minimum voltage of all cells collected;

[0075] In addition, for the calculated equalization threshold, it is determined whether the equalization threshold is less than 3350mV, where 3350 is the threshold set in the embodiment, and the threshold is determined according to the specifications of the battery cell. For an equalization threshold less than 3350mV, the equalization threshold is 3350mV, otherwise the equalization threshold is maintained at the original value obtained by calculation.

[0076] Step 5: Determine whether the maximum cell voltage collected has reached the full charge mark or whether there is a large current charge. Execute differently according to different situations:

[0077] Step 6A: If maxV does not reach the voltage value that the battery is deemed to be fully charged, i.e., the fully charged mark, or there is a large current charge, balancing can still be performed based on the voltage difference, including:

[0078] Passive balancing: For cells with large voltage differences, the BMS can consume excess charge by connecting a resistor until the cell voltage is close to the average voltage of the battery pack.

[0079] Active balancing: For cells with large voltage differences, the BMS will transfer charge from cells with higher voltage to cells with lower voltage through energy transfer circuits.

[0080] Step 6B-1: If maxV reaches the voltage value that the battery is deemed to be fully charged, i.e., the full mark, and the battery is charged at a low current, it is determined that the maxV battery cell is fully charged and should not be charged further. At this time, equalization based on the voltage difference is no longer appropriate, and a delayed equalization judgment can be made. Through the voltage imbalance, the voltage ampere-hour data table is searched respectively to obtain the ampere-hour corresponding to the battery cell voltage. The voltage ampere-hour data table is obtained based on the voltage-capacity curve of the battery cell;

[0081] Step 6B-2: The capacity difference is obtained by looking up the table, and then the equalization time required for each battery cell to eliminate this difference is converted according to the equalization capability of the hardware and software design of the battery system, as shown in the following formula:

[0082] Balance time = ampere-time difference / average balance current

[0083] The average balancing current is determined by the balancing execution capability of the battery. The ampere-hour difference is the difference between the ampere-hour corresponding to the cell voltage and the ampere-hour corresponding to the balancing threshold.

[0084] In the embodiment, for the obtained balancing time, it is determined whether 0<balancing time≤12 is satisfied, and the unit is hours. If the balancing time is less than 0, balancing is not performed. If the balancing time is greater than 12 hours, balancing is performed based on 12 hours.

[0085] Step 6B-3: Perform passive balanced discharge on each cell according to the obtained balanced time, and keep the passive balanced discharge before the balanced time ends.

[0086] In the embodiment, an improved power balancing method is proposed, which is particularly suitable for the situation when the battery pack is fully charged. For each battery cell, a balancing voltage difference is set according to the charging current, and a balancing threshold is calculated based on the balancing voltage difference and the minimum voltage of the battery, the battery cell that needs to be balanced is determined, and the temperature of the balancing module is monitored in real time to ensure that the balancing operation is performed within a safe temperature range. If the safety threshold is exceeded, the balancing operation is stopped to avoid safety problems caused by overheating. During the charging process, a suitable balancing method is selected according to the battery cell voltage and current. For the situation where the battery cell is fully charged, the ampere-hour corresponding to the battery cell voltage is obtained by looking up the voltage ampere-time difference data table, and the balancing time is converted based on the ampere-time difference between the battery cell voltage and the balancing threshold and the balancing execution capability, and each battery cell is passively balanced and discharged, which solves the problem that the voltage difference between the battery cells is difficult to adjust in the fully charged state, and realizes more accurate battery cell balancing. By accurately controlling the balancing between the battery cells, the service life of the entire battery pack is extended. This method is not only applicable to the situation where the battery pack is fully charged, but also to dynamic balancing during the charging process. It has wide applicability and flexibility, ensuring that the battery pack can maintain a balanced state under different charging states, avoiding overcharging and over-discharging, and improving the safety of the battery pack.

[0087] The following is an example to illustrate how the method of the present invention is performed: There are currently three battery cell voltages. After sampling, the battery cell voltages are 3320mV, 3330mV, and 3440mV, respectively. The charging current is 0.5A, the minV is 3320mV, and the maxV is 3400mV.

[0088] According to the balanced voltage difference formula, it can be calculated that =10+5*0.5=12.5mV; the balanced threshold is 3320+10+5*0.5, which is equal to 3332.5mV. Since it is less than the threshold of 3350mV, the balanced threshold is 3350mV.

[0089] When maxV reaches the full charge mark voltage of 3440mV and only a small current is charged, the cell with the highest capacity is already full and cannot be charged continuously. The calculation of delay balancing begins and the delay balancing action is continuously executed.

[0090] Among them, the battery cells with voltages of 3320mV and 3330mV are unbalanced if they are lower than the balancing threshold. The delayed balancing time of the first two strings of battery cells is 0. The battery cell with a voltage of 3440mV obviously still needs passive balanced discharge to achieve balance with other battery cells.

[0091] Calculate the delay balancing time of the battery cell with a voltage of 3440mV, and the average balancing current of the BMS is 50mA;

[0092] According to the table, the ampere-hour of the equalization threshold of 3350mV is 420mAh, and the ampere-hour of 3440 is 30mAh. Therefore, 3440mV needs to be discharged 420-30=390mAh to equalize to 3350mV. The delayed equalization time of the voltage of 3440 is 390 / 50=7.8 hours, and the equalization discharge is carried out according to the equalization time of 7.8 hours.

[0093] In the subsequent balanced discharge process, regardless of entering the standby or discharge state, even if the voltage drops and fails to reach the balanced voltage range, the discharge balance will be maintained before the end of the 7.8-hour balanced time.

[0094] In an embodiment of the present invention, a power balancing device for an energy storage battery is also provided, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the power balancing method for an energy storage battery as described above when executing the computer program.

[0095] The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected by a bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for equalizing the power of an energy storage battery is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0096] The memory may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable read-only memory (EEPROM), etc. The memory is used to store programs, and the processor executes the programs after receiving the execution instruction.

[0097] The processor can be an integrated circuit chip with signal processing capabilities. The above-mentioned processor can be a general-purpose processor, including a central processing unit (Central Processing Unit, referred to as: CPU), a network processor (Network Processor, referred to as: NP), etc. The processor can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The various methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0098] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0099] In an embodiment of the present invention, a computer-readable storage medium is further provided, on which a program is stored, characterized in that when the program is executed by a processor, the power balancing method for an energy storage battery as described above is implemented.

[0100] Those skilled in the art will appreciate that the embodiments of the embodiments of the present invention may be provided as methods, computer devices, or computer program products. Therefore, the embodiments of the present invention may take the form of complete hardware embodiments, complete software embodiments, or embodiments combining software and hardware. Moreover, the embodiments of the present invention may take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0101] The embodiments of the present invention are described with reference to flowcharts and / or block diagrams of methods, computer devices, or computer program products according to the embodiments of the present invention. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate a device for implementing the functions specified in the flowcharts and / or.

[0102] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in the flowchart.

[0103] In an embodiment of the present invention, a computer program product is further provided, comprising a computer program / instruction, wherein the computer program / instruction implements the steps of the above method when executed by a processor.

[0104] In actual application, the above-mentioned computer program products include but are not limited to: smart phones, desktop computers, laptop computers, tablet computers, host computers and server platforms, etc., and are not specifically limited here.

[0105] The above is a detailed introduction to the application of the method, system, computer device, computer-readable storage medium, and computer program product for energy storage batteries provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for equalizing the amount of electricity used in an energy storage battery, characterized in that: The following steps are involved: Collect the voltage and charge and discharge current of all battery cells respectively; Determine whether it is in the charging process, if so, calculate the equalization voltage difference, calculate the equalization threshold value based on the equalization voltage difference and the minimum voltage of the battery, and determine the battery cell that needs to be equalized according to the equalization threshold value; Determine whether the maximum cell voltage collected has reached the full mark or whether there is high current charging. If it has not reached the full mark and / or there is high current charging, balance is performed based on the voltage difference. If the full charge mark is reached and / or there is no high current charging, then for the cells whose voltage is greater than the equalization threshold, the voltage ampere-hour data table is searched respectively to obtain the ampere-hour corresponding to the cell voltage, wherein the voltage ampere-hour data table is obtained based on the voltage-capacity curve of the cell; Calculate the balancing time for each cell based on the ampere-hours and balancing execution capability; According to the obtained balancing time, each battery cell is passively balanced and discharged.

2. A method for equalizing the amount of electricity used in an energy storage battery according to claim 1, characterized in that: The method also includes the following steps: before the equalization time ends, always maintaining the passive equalization discharge.

3. The method for equalizing the amount of electricity used in an energy storage battery according to claim 1, characterized in that: For the equalization pressure difference, it is calculated according to the following formula: Balanced voltage difference = 10mV + Vp*I Where I is the charging current and Vp is the voltage difference coefficient set according to the battery cell specifications.

4. A method for equalizing the amount of electricity used in an energy storage battery according to claim 3, characterized in that: The balance threshold is calculated according to the following formula: Balance threshold = minV + balance pressure difference Among them, minV is the minimum voltage of all cells collected; For the calculated equalization threshold, it is determined whether the equalization threshold is less than the threshold value. If the equalization threshold is less than the threshold value, the equalization threshold is set to the threshold value; otherwise, the equalization threshold is kept to be the original value obtained by calculation.

5. The method for equalizing the amount of electricity used in an energy storage battery according to claim 1, characterized in that: The equilibrium time is obtained by the following formula: Balance time = ampere-time difference / average balance current Among them, the average balancing current is determined by the balancing execution capability of the battery, and the ampere-hour difference is the difference between the ampere-hour corresponding to the cell voltage and the ampere-hour corresponding to the balancing threshold.

6. The method for equalizing the amount of electricity used in an energy storage battery according to claim 1, characterized in that: For the obtained balancing time, determine whether it satisfies 0<balancing time≤12, in hours. If the balancing time is less than 0, no balancing is performed. If the balancing time is greater than 12 hours, balancing is performed based on 12 hours.

7. The method for equalizing the amount of electricity used in an energy storage battery according to claim 1, characterized in that: After collecting the voltages of all cells of the battery, the following steps are performed: Collect temperature information of the balancing module; Determine whether the temperature of the balancing module exceeds the safety threshold. If so, stop balancing; otherwise, determine whether to start balancing based on the collected battery cell voltage.

8. A power equalization device for an energy storage battery, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the power balancing method for an energy storage battery as claimed in claim 1 is implemented.

9. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed by the processor, a power balancing method for an energy storage battery as claimed in claim 1 is implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to claim 1 are implemented.

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