Equalization processing method of energy storage battery and related device thereof

Abstract

The invention relates to an equalization processing method for an energy storage battery and a related device thereof, and the method comprises the steps: obtaining a voltage value of each single battery in the energy storage battery after the charging of the energy storage battery is completed, and determining a highest voltage value in the single batteries, and the energy storage battery comprises a plurality of single batteries; if the maximum voltage of all the single batteries in the energy storage battery is greater than a first preset voltage, comparing the voltage of each single battery with a plurality of different preset voltages, and determining single batteries to be equalized; calculating a first difference value between the voltage of each single battery to be equalized and a third preset voltage, and determining an equalization capacity value of each single battery to be equalized according to the first difference value; and performing equalization processing on the to-be-equalized battery monomers according to the equalization capacity value of each to-be-equalized battery monomer. According to the scheme provided by the invention, the state of each battery monomer in the energy storage battery can be kept consistent, the safety of the energy storage battery is enhanced, and the service life of the energy storage battery is effectively prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage batteries, and in particular to an energy storage battery equalization processing method and related devices. Background Art

[0002] The energy storage battery system has many battery clusters and a large number of cells. After charging, it is easy for the voltages of each cell to be inconsistent, which is not conducive to the long-term cycle charge and discharge of the battery.

[0003] Since the energy storage battery system uses a large number of cells and there are certain differences in the self-discharge of the factory cells during assembly and actual use, the commonly used balancing judgment method has limited ability to solve the cell consistency problem of the energy storage system. In particular, it is impossible to well define the relationship between the BMS's balancing capability and the BMS balancing time requirement, resulting in the inability to maintain consistent status of each cell. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a balancing processing method for an energy storage battery and a related device thereof, which can make the state of each battery cell in the energy storage battery consistent, enhance the safety of the energy storage battery, and effectively extend the service life of the energy storage battery.

[0005] The first aspect of the present application provides a method for equalizing an energy storage battery, comprising obtaining a voltage value of each battery cell in the energy storage battery after charging of the energy storage battery is completed, and determining a maximum voltage value among the battery cells, wherein the energy storage battery comprises a plurality of battery cells;

[0006] If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cells to be balanced, the plurality of different preset voltages include the first preset voltage, the second preset voltage and the third preset voltage, the second preset voltage, the first preset voltage and the third preset voltage decrease in sequence, and the number of the battery cells to be balanced is less than or equal to 25% of the number of all battery cells in the energy storage battery;

[0007] Calculating a first difference between the highest voltage of each battery cell to be balanced and the third preset voltage, and determining a balancing capacity value of each battery cell to be balanced according to the first difference;

[0008] According to the balanced capacity value of each of the battery cells to be balanced, the battery cells to be balanced are balanced.

[0009] In combination with the first aspect, in a possible implementation of the first aspect, if the maximum voltage of all battery cells in the energy storage battery is greater than a first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cell to be balanced, including: if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the battery cell having a maximum voltage greater than the second preset voltage is determined as the first battery cell to be balanced; and the balancing processing of the battery cells to be balanced includes: if the number of the first battery cells to be balanced is greater than 10% of the number of all battery cells in the energy storage battery, balancing processing is performed on the first battery cells to be balanced.

[0010] In combination with the first aspect, in a possible implementation of the first aspect, if the maximum voltage of all battery cells in the energy storage battery is greater than a first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cell to be balanced, including: if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the battery cell having a maximum voltage greater than the first preset voltage is determined as a second battery cell to be balanced; and the balancing processing of the battery cells to be balanced includes: if the number of the second battery cells to be balanced is greater than 20% of the number of all battery cells in the energy storage battery, balancing processing is performed on the second battery cells to be balanced.

[0011] In combination with the first aspect, in a possible implementation of the first aspect, if the maximum voltage of all battery cells in the energy storage battery is greater than a first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cell to be balanced, including if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, determining the battery cell having a maximum voltage greater than the third preset voltage as the third battery cell to be balanced; and balancing the battery cells to be balanced includes: balancing the third battery cell to be balanced.

[0012] In combination with the first aspect, in a possible implementation of the first aspect, the calculating a first difference between the maximum voltage of each battery cell to be balanced and the third preset voltage, and determining the equalization capacity value of each battery cell to be balanced according to the first difference, includes: calculating the first difference between the maximum voltage of each battery cell to be balanced and the third preset voltage; if the first difference is greater than 200mv, determining the equalization capacity value of each battery cell to be balanced to be 1% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 150mv, determining the equalization capacity value of each battery cell to be balanced to be 0.8% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 100mv, determining the equalization capacity value of each battery cell to be balanced to be 0.6% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 50mv, determining the equalization capacity value of each battery cell to be balanced to be 0.2% of the rated capacity of the battery cell to be balanced.

[0013] In combination with the first aspect, in a possible implementation of the first aspect, according to the balanced capacity value of each battery cell to be balanced, the battery cell to be balanced is balanced: according to the balanced capacity value of each battery cell to be balanced, the balanced time of each battery cell to be balanced is calculated; according to the balanced time, the battery cell to be balanced is balanced; wherein the balanced time of the battery cell to be balanced is calculated according to the following formula:

[0014] T=23.5*C

[0015] Wherein, T is the balancing time, and C is the balancing capacity value.

[0016] In combination with the first aspect, in a possible implementation manner of the first aspect, the first preset voltage is 3.45V, the second preset voltage is 3.5V, and the third preset voltage is 3.4V.

[0017] A second aspect of the present application provides an energy storage battery equalization processing device, comprising an acquisition module, for acquiring a voltage value of each battery cell in the energy storage battery after the energy storage battery is charged, and determining a maximum voltage value among the battery cells, wherein the energy storage battery comprises a plurality of battery cells;

[0018] a determination module, configured to compare the voltage of each battery cell with a plurality of different preset voltages to determine the battery cells to be balanced if the maximum voltage of all battery cells in the energy storage battery is greater than a first preset voltage, wherein the plurality of different preset voltages include the first preset voltage, a second preset voltage, and a third preset voltage, wherein the second preset voltage, the first preset voltage, and the third preset voltage decrease in sequence, and the number of the battery cells to be balanced is less than or equal to 25% of the number of all battery cells in the energy storage battery;

[0019] A calculation module, configured to calculate a first difference between the highest voltage of each battery cell to be balanced and the third preset voltage, and determine a balanced capacity value of each battery cell to be balanced according to the first difference;

[0020] The processing module is used to perform balancing processing on the battery cells to be balanced according to the balancing capacity value of each battery cell to be balanced.

[0021] In combination with the second aspect, in a possible implementation of the second aspect, the determination module is further configured to, if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, determine the battery cell having a maximum voltage greater than the second preset voltage as the first battery cell to be balanced, and if the number of the first battery cells to be balanced is greater than 10% of the number of all battery cells in the energy storage battery, perform balancing on the first battery cells to be balanced.

[0022] In combination with the second aspect, in a possible implementation of the second aspect, the determination module is further used to, if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, determine the battery cell with a maximum voltage greater than the first preset voltage as the second battery cell to be balanced; if the number of the second battery cells to be balanced is greater than 20% of the number of all battery cells in the energy storage battery, perform balancing on the second battery cells to be balanced.

[0023] In conjunction with the second aspect, in a possible implementation of the second aspect, the determining module is further configured to:

[0024] In combination with the second aspect, in a possible implementation of the second aspect, if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the battery cell whose maximum voltage is greater than the third preset voltage is determined as a third battery cell to be balanced; and the third battery cell to be balanced is balanced.

[0025] In combination with the second aspect, in a possible implementation manner of the second aspect, the calculation module is further used to calculate a first difference between the highest voltage of each of the battery cells to be balanced and the third preset voltage; if the first difference is greater than 200mv, the equalization capacity value of each of the battery cells to be balanced is determined to be 1% of the rated capacity of the battery cells to be balanced; if the first difference is greater than 150mv, the equalization capacity value of each of the battery cells to be balanced is determined to be 0.8% of the rated capacity of the battery cells to be balanced; if the first difference is greater than 100mv, the equalization capacity value of each of the battery cells to be balanced is determined to be 0.6% of the rated capacity of the battery cells to be balanced; if the first difference is greater than 50mv, the equalization capacity value of each of the battery cells to be balanced is determined to be 0.2% of the rated capacity of the battery cells to be balanced.

[0026] In combination with the second aspect, in a possible implementation manner of the second aspect, the processing module is further used to calculate the balancing time of each battery cell to be balanced according to the balancing capacity value of each battery cell to be balanced;

[0027] Performing equalization processing on the battery cells to be equalized according to the equalization time;

[0028] The balancing time of the battery cells to be balanced is calculated according to the following formula:

[0029] T=23.5*C

[0030] Wherein, T is the balancing time, and C is the balancing capacity value.

[0031] A third aspect of the present application provides an electronic device, including:

[0032] Processor; and

[0033] The memory stores executable codes thereon, and when the executable codes are executed by the processor, the processor is caused to execute the method as described above.

[0034] A fourth aspect of the present application provides a computer-readable storage medium having executable code stored thereon. When the executable code is executed by a processor of an electronic device, the processor is caused to execute the method as described above.

[0035] The technical solution provided by this application may have the following beneficial effects:

[0036] The energy storage battery equalization processing method and related device of the present application include obtaining the voltage value of each battery cell in the energy storage battery after the energy storage battery is charged, and determining the highest voltage value among the battery cells, wherein the energy storage battery includes multiple battery cells; if the maximum voltage of all the battery cells in the energy storage battery is greater than a first preset voltage, then comparing the voltage of each battery cell with a plurality of different preset voltages to determine the battery cells to be equalized, wherein the plurality of different preset voltages include a first preset voltage, a second preset voltage, and a third preset voltage, wherein the second preset voltage, the first preset voltage, and the third preset voltage decrease in sequence, and the number of the battery cells to be equalized is less than or equal to 25% of the number of all the battery cells in the energy storage battery; calculating a first difference between the highest voltage of each of the battery cells to be equalized and the third preset voltage, and determining the equalization capacity value of each battery cell to be equalized according to the first difference; and performing equalization processing on the battery cells to be equalized according to the equalization capacity value of each battery cell to be equalized, so that the state of each battery cell in the energy storage battery can be kept consistent, the safety of the energy storage battery is enhanced, and the service life of the energy storage battery is effectively extended.

[0037] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0039] Figure 1 It is a flow chart of a method for equalizing an energy storage battery according to an embodiment of the present application;

[0040] Figure 2 It is a structural schematic diagram of an energy storage battery equalization processing device shown in an embodiment of the present application;

[0041] Figure 3 It is a schematic diagram of the structure of an electronic device shown in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0043] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "a", "an" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0044] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0045] In the related art, the energy storage battery system has many battery clusters and a large number of cells. After charging, it is easy for the voltages of the cells to be inconsistent, which is not conducive to the long-term cycle charge and discharge of the battery. Since the energy storage battery system uses a large number of cells, and there are certain self-discharge differences between the factory cells during assembly and actual use, the commonly used equalization judgment method has limited ability to solve the problem of cell consistency in the energy storage system, especially it is impossible to well define the relationship between the equalization ability of the BMS and the BMS equalization time requirement, resulting in the inability to keep the status of each cell consistent, especially the phenomenon that the voltage difference gradually increases with the difference in self-discharge rate.

[0046] In view of the above problems, an embodiment of the present application provides a method for balancing an energy storage battery, which can keep the state of each battery cell in the energy storage battery consistent, enhance the safety of the energy storage battery, and effectively extend the service life of the energy storage battery.

[0047] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0048] Figure 1 It is a flow chart of a method for equalizing an energy storage battery according to an embodiment of the present application.

[0049] See also Figure 1 , a method for equalizing an energy storage battery, comprising:

[0050] S110: Obtaining the voltage value of each battery cell in the energy storage battery after the energy storage battery is charged, and determining the highest voltage value among the battery cells, wherein the energy storage battery includes a plurality of battery cells.

[0051] Specifically, a battery cell is a battery core, and an energy storage battery includes multiple battery cells. The voltage value of each battery cell can be collected by a voltage sensor. The voltage sensor can collect the voltage of the battery cell in real time. After the energy storage battery is charged, the voltage value of each battery cell collected by the voltage sensor can be read. The voltage sensor can be a Hall voltage sensor, an analog output voltage sensor, a digital output voltage sensor, etc., and the embodiment of the present invention does not limit this.

[0052] S120: If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cells to be balanced, the plurality of different preset voltages include a first preset voltage, a second preset voltage and a third preset voltage, the second preset voltage, the first preset voltage and the third preset voltage decrease in sequence, and the number of battery cells to be balanced is less than or equal to 25% of the number of all battery cells in the energy storage battery.

[0053] Specifically, if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, it can be preliminarily determined that there are battery cells that need to be balanced in the energy storage battery, and the voltage of each battery cell is compared with multiple different preset voltages, and the battery cell to be balanced is determined according to the comparison result. On the basis of ensuring that the battery cell to be balanced can be accurately located, the complexity of the comparison process can be reduced and the balancing efficiency can be improved.

[0054] Specifically, according to different first preset voltages, second preset voltages and third preset voltages, the battery cells to be balanced can be determined according to different judgment rules. When determining the balanced battery cells, it can be ensured that the number of battery cells to be balanced is less than or equal to 25% of the number of all battery cells in the energy storage battery, thereby avoiding excessively large battery cells to be balanced, reducing the pressure of the balancing process, and improving the balancing efficiency.

[0055] In a possible implementation, if the maximum voltage of all battery cells in the energy storage battery is greater than a first preset voltage, a battery cell having a maximum voltage greater than a second preset voltage is determined as a first battery cell to be balanced; and the battery cells to be balanced are balanced, including: if the number of the first battery cells to be balanced is greater than 10% of the number of all battery cells in the energy storage battery, the first battery cells to be balanced are balanced.

[0056] Specifically, after the energy storage battery is charged, if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, it can be preliminarily determined that there are battery cells that need to be balanced in the energy storage battery, and the maximum voltage of each battery cell is compared with the second preset voltage. If it is greater than the second preset voltage, the battery cell greater than the second preset voltage is used as the first battery cell to be balanced. After all the first battery cells to be balanced are determined, if the number of the first battery cells to be balanced is greater than 10% of the number of all battery cells in the energy storage battery, the first battery cells to be balanced are balanced, which can better locate the battery cells to be balanced and improve the efficiency of the balancing process.

[0057] In a possible implementation, if the maximum voltage of all battery cells in the energy storage battery is greater than a first preset voltage, the battery cell whose maximum voltage is greater than the first preset voltage is determined as a second battery cell to be balanced; and the battery cells to be balanced are balanced, including: if the number of the second battery cells to be balanced is greater than 20% of the number of all battery cells in the energy storage battery, the second battery cells to be balanced are balanced.

[0058] Specifically, after the energy storage battery is charged, if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, it can be preliminarily determined that there are battery cells that need to be balanced in the energy storage battery, and the maximum voltage of each battery cell is compared with the first preset voltage. If it is greater than the first preset voltage, the battery cell greater than the first preset voltage is used as the second battery cell to be balanced. After all the second battery cells to be balanced are determined, if the number of the second battery cells to be balanced is greater than 20% of the number of all battery cells in the energy storage battery, the second battery cells to be balanced are balanced, which can better locate the battery cells to be balanced and improve the efficiency of the balancing process.

[0059] In a possible implementation, if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the battery cell with the maximum voltage greater than the third preset voltage is determined as the third battery cell to be balanced; and the third battery cell to be balanced is balanced.

[0060] Specifically, after the energy storage battery is charged, if the maximum voltage of all battery cells in the energy storage battery is greater than the third preset voltage, it can be preliminarily determined that there are battery cells that need to be balanced in the energy storage battery, and the maximum voltage of each battery cell is compared with the third preset voltage. If it is greater than the third preset voltage, the battery cell greater than the third preset voltage is used as the third battery cell to be balanced. After all the third battery cells to be balanced are determined, the third battery cells to be balanced are balanced, which can better locate the battery cells to be balanced and improve the efficiency of the balancing process.

[0061] In a possible implementation manner, the first preset voltage is 3.45V, the second preset voltage is 3.5V, and the third preset voltage is 3.4V.

[0062] S130: Calculate a first difference between the highest voltage of each battery cell to be balanced and a third preset voltage, and determine a balancing capacity value of each battery cell to be balanced according to the first difference.

[0063] Specifically, the equalization capacity value of the battery cell to be balanced can be determined according to the first difference between the highest voltage of the battery cell to be balanced and the third preset voltage. The equalization capacity value can be a percentage of the rated capacity of the battery cell to be balanced. The battery cells can be balanced by adjusting the equalization capacity value.

[0064] In a possible implementation, a first difference between the highest voltage of each battery cell to be balanced and the third preset voltage is calculated; if the first difference is greater than 200mv, the balancing capacity value of each battery cell to be balanced is determined to be 1% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 150mv, the balancing capacity value of each battery cell to be balanced is determined to be 0.8% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 100mv, the balancing capacity value of each battery cell to be balanced is determined to be 0.6% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 50mv, the balancing capacity value of each battery cell to be balanced is determined to be 0.2% of the rated capacity of the battery cell to be balanced.

[0065] Specifically, the balancing capacity value can be set to 0.2%-1% of the rated capacity of the battery cell to be balanced. Balancing the battery cells within this range can better make each battery cell approach consistency and achieve consistency of the battery energy storage battery.

[0066] S140: performing a balancing process on the battery cells to be balanced according to the balancing capacity value of each battery cell to be balanced.

[0067] Specifically, after determining the battery cells to be balanced and the balanced capacity value of each battery cell to be balanced, the battery cells to be balanced can be balanced to better improve the consistency of each battery cell.

[0068] In a possible implementation, the balancing time of each battery cell to be balanced can be calculated according to the balancing capacity value of each battery cell to be balanced, and the battery cell to be balanced can be balanced according to the balancing time; wherein the balancing time of the battery cell to be balanced is calculated according to the following formula:

[0069] T=23.5*C

[0070] Among them, T is the balancing time and C is the balancing capacity value.

[0071] Specifically, the balancing capacity value may be the percentage of the rated capacity of the battery cell*the rated capacity of the battery cell to be balanced. For example, for the battery cell A that needs to be balanced, the balancing capacity value is 0.8% of the rated capacity of the battery cell to be balanced, and the rated capacity of the battery cell A is 100Ah. The balancing time required for the battery cell A is T=23.5*0.8%*100, T=18.8h, which means that the battery cell A needs 18.8h to complete the balancing process. Balancing each battery cell by the above formula can better reduce the balancing time, improve the balancing efficiency, and improve the consistency of each battery cell.

[0072] The energy storage battery equalization processing method of the present application includes obtaining the voltage value of each battery cell in the energy storage battery after the energy storage battery is charged, and determining the highest voltage value among the battery cells, wherein the energy storage battery includes multiple battery cells; if the maximum voltage of all the battery cells in the energy storage battery is greater than a first preset voltage, then comparing the voltage of each battery cell with a plurality of different preset voltages to determine the battery cells to be equalized, wherein the plurality of different preset voltages include a first preset voltage, a second preset voltage, and a third preset voltage, wherein the second preset voltage, the first preset voltage, and the third preset voltage decrease in sequence, and the number of the battery cells to be equalized is less than or equal to 25% of the number of all the battery cells in the energy storage battery; calculating a first difference between the highest voltage of each battery cell to be equalized and the third preset voltage, and determining the equalization capacity value of each battery cell to be equalized according to the first difference; and performing equalization processing on the battery cells to be equalized according to the equalization capacity value of each battery cell to be equalized, so that the state of each battery cell in the energy storage battery can be kept consistent, the safety of the energy storage battery is enhanced, and the service life of the energy storage battery is effectively extended.

[0073] Corresponding to the aforementioned application function implementation method embodiment, the present application also provides an energy storage battery balancing processing device, an electronic device and corresponding embodiments.

[0074] Figure 2 It is a structural schematic diagram of an energy storage battery equalization processing device 200 shown in an embodiment of the present application.

[0075] See also Figure 2 , a balancing processing device 200 for an energy storage battery, comprising:

[0076] The acquisition module 210 is used to acquire the voltage value of each battery cell in the energy storage battery after the energy storage battery is charged, and determine the highest voltage value among the battery cells. The energy storage battery includes multiple battery cells.

[0077] Specifically, a battery cell is a battery core, and an energy storage battery includes multiple battery cells. The voltage value of each battery cell can be collected by a voltage sensor. The voltage sensor can collect the voltage of the battery cell in real time. After the energy storage battery is charged, the voltage value of each battery cell collected by the voltage sensor can be read. The voltage sensor can be a Hall voltage sensor, an analog output voltage sensor, a digital output voltage sensor, etc., and the embodiment of the present invention does not limit this.

[0078] The determination module 220 is used to compare the voltage of each battery cell with a plurality of different preset voltages to determine the battery cells to be balanced if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the plurality of different preset voltages include a first preset voltage, a second preset voltage and a third preset voltage, the second preset voltage, the first preset voltage and the third preset voltage decrease in sequence, and the number of battery cells to be balanced is less than or equal to 25% of the number of all battery cells in the energy storage battery.

[0079] Specifically, if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, it can be preliminarily determined that there are battery cells that need to be balanced in the energy storage battery, and the voltage of each battery cell is compared with multiple different preset voltages, and the battery cell to be balanced is determined according to the comparison result. On the basis of ensuring that the battery cell to be balanced can be accurately located, the complexity of the comparison process can be reduced and the balancing efficiency can be improved.

[0080] In a possible implementation, the determination module 220 is further configured to determine a battery cell having a maximum voltage greater than a second preset voltage as a first battery cell to be balanced if the maximum voltage of all battery cells in the energy storage battery is greater than a first preset voltage; and perform balancing on the battery cells to be balanced, including: if the number of the first battery cells to be balanced is greater than 10% of the number of all battery cells in the energy storage battery, perform balancing on the first battery cells to be balanced.

[0081] In a possible implementation, the determination module 220 is further configured to determine a battery cell having a maximum voltage greater than the first preset voltage as a second battery cell to be balanced if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage; and perform balancing on the battery cells to be balanced, including: if the number of the second battery cells to be balanced is greater than 20% of the number of all battery cells in the energy storage battery, perform balancing on the second battery cells to be balanced.

[0082] In a possible implementation, the determination module 220 is further configured to determine a battery cell having a maximum voltage greater than a third preset voltage as a third battery cell to be balanced if the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage; and perform balancing on the third battery cell to be balanced.

[0083] The calculation module 230 is used to calculate a first difference between the highest voltage of each battery cell to be balanced and a third preset voltage, and determine a balanced capacity value of each battery cell to be balanced according to the first difference.

[0084] Specifically, the equalization capacity value of the battery cell to be balanced can be determined according to the first difference between the highest voltage of the battery cell to be balanced and the third preset voltage. The equalization capacity value can be a percentage of the rated capacity of the battery cell to be balanced. The battery cells can be balanced by adjusting the equalization capacity value.

[0085] In a possible implementation, the calculation module 230 is further used to calculate a first difference between the highest voltage of each battery cell to be balanced and the third preset voltage; if the first difference is greater than 200mv, the balancing capacity value of each battery cell to be balanced is determined to be 1% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 150mv, the balancing capacity value of each battery cell to be balanced is determined to be 0.8% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 100mv, the balancing capacity value of each battery cell to be balanced is determined to be 0.6% of the rated capacity of the battery cell to be balanced; if the first difference is greater than 50mv, the balancing capacity value of each battery cell to be balanced is determined to be 0.2% of the rated capacity of the battery cell to be balanced.

[0086] The processing module 240 is used to perform balancing processing on the battery cells to be balanced according to the balancing capacity value of each battery cell to be balanced.

[0087] Specifically, after determining the battery cells to be balanced and the balanced capacity value of each battery cell to be balanced, the battery cells to be balanced can be balanced to better improve the consistency of each battery cell.

[0088] In a possible implementation, the processing module 240 is further configured to calculate the balancing time of each battery cell to be balanced according to the balancing capacity value of each battery cell to be balanced, and perform balancing processing on the battery cell to be balanced according to the balancing time; wherein the balancing time of the battery cell to be balanced is calculated according to the following formula:

[0089] T=23.5*C

[0090] Among them, T is the balancing time and C is the balancing capacity value.

[0091] The energy storage battery equalization processing device of the present application comprises the following steps: obtaining the voltage value of each battery cell in the energy storage battery after the energy storage battery is charged, and determining the highest voltage value among the battery cells, wherein the energy storage battery comprises a plurality of battery cells; if the maximum voltage of all the battery cells in the energy storage battery is greater than a first preset voltage, comparing the voltage of each battery cell with a plurality of different preset voltages to determine the battery cells to be equalized, wherein the plurality of different preset voltages comprise a first preset voltage, a second preset voltage and a third preset voltage, wherein the second preset voltage, the first preset voltage and the third preset voltage decrease in sequence, and the number of the battery cells to be equalized is less than or equal to 25% of the number of all the battery cells in the energy storage battery; calculating a first difference between the highest voltage of each battery cell to be equalized and the third preset voltage, and determining the equalization capacity value of each battery cell to be equalized according to the first difference; and performing equalization processing on the battery cells to be equalized according to the equalization capacity value of each battery cell to be equalized, so that the state of each battery cell in the energy storage battery can be kept consistent, the safety of the energy storage battery is enhanced, and the service life of the energy storage battery is effectively extended.

[0092] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated again here.

[0093] Figure 3 It is a schematic diagram of the structure of an electronic device shown in an embodiment of the present application.

[0094] See also Figure 3 , the electronic device 300 includes a memory 310 and a processor 320.

[0095] The processor 320 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0096] The memory 310 may include various types of storage units, such as system memory, read-only memory (ROM), and permanent storage devices. Among them, ROM can store static data or instructions required by the processor 320 or other modules of the computer. The permanent storage device may be a readable and writable storage device. The permanent storage device may be a non-volatile storage device that does not lose the stored instructions and data even after the computer is powered off. In some embodiments, the permanent storage device uses a large-capacity storage device (such as a magnetic or optical disk, flash memory) as a permanent storage device. In some other embodiments, the permanent storage device may be a removable storage device (such as a floppy disk, optical drive). The system memory may be a readable and writable storage device or a volatile readable and writable storage device, such as a dynamic random access memory. The system memory may store some or all instructions and data required by the processor at run time. In addition, the memory 310 may include any combination of computer-readable storage media, including various types of semiconductor storage chips (such as DRAM, SRAM, SDRAM, flash memory, programmable read-only memory), and disks and / or optical disks may also be used. In some embodiments, the memory 310 may include a readable and / or writable removable storage device, such as a laser disc (CD), a read-only digital versatile disc (such as a DVD-ROM, a double-layer DVD-ROM), a read-only Blu-ray disc, an ultra-density optical disc, a flash memory card (such as an SD card, a mini SD card, a Micro-SD card, etc.), a magnetic floppy disk, etc. Computer-readable storage media do not include carrier waves and transient electronic signals transmitted wirelessly or wired.

[0097] The memory 310 stores executable codes, and when the executable codes are processed by the processor 320 , the processor 320 can execute part or all of the methods described above.

[0098] In addition, the method according to the present application may also be implemented as a computer program or a computer program product, which includes computer program code instructions for executing some or all of the steps in the above method of the present application.

[0099] Alternatively, the present application can also be implemented as a computer-readable storage medium (or non-transitory machine-readable storage medium or machine-readable storage medium) on which executable code (or computer program or computer instruction code) is stored. When the executable code (or computer program or computer instruction code) is executed by a processor of an electronic device (or server, etc.), the processor executes part or all of the steps of the above-mentioned method according to the present application.

[0100] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for equalizing an energy storage battery, characterized in that: include: Obtaining the voltage value of each battery cell in the energy storage battery after the energy storage battery is charged, and determining the highest voltage value among the battery cells, wherein the energy storage battery includes a plurality of battery cells; If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cells to be balanced, the plurality of different preset voltages include the first preset voltage, the second preset voltage and the third preset voltage, the second preset voltage, the first preset voltage and the third preset voltage decrease in sequence, and the number of the battery cells to be balanced is less than or equal to 25% of the number of all battery cells in the energy storage battery; Calculating a first difference between the highest voltage of each battery cell to be balanced and the third preset voltage, and determining a balancing capacity value of each battery cell to be balanced according to the first difference; According to the balanced capacity value of each of the battery cells to be balanced, the battery cells to be balanced are balanced.

2. The method according to claim 1, characterized in that If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cell to be balanced, including: If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the battery cell having the maximum voltage greater than the second preset voltage is determined as the first battery cell to be balanced; The step of performing equalization processing on the battery cells to be equalized includes: If the number of the first battery cells to be balanced is greater than 10% of the number of all battery cells in the energy storage battery, the first battery cells to be balanced are balanced.

3. The method according to claim 2, characterized in that If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cell to be balanced, including: If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the battery cell having the maximum voltage greater than the first preset voltage is determined as the second battery cell to be balanced; The step of performing equalization processing on the battery cells to be equalized includes: If the number of the second battery cells to be balanced is greater than 20% of the number of all battery cells in the energy storage battery, the second battery cells to be balanced are balanced.

4. The method according to claim 3, characterized in that: If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, the voltage of each battery cell is compared with a plurality of different preset voltages to determine the battery cell to be balanced, including: If the maximum voltage of all battery cells in the energy storage battery is greater than the first preset voltage, a battery cell having a maximum voltage greater than the third preset voltage is determined as a third battery cell to be balanced; The step of performing equalization processing on the battery cells to be equalized includes: The third battery cell to be balanced is subjected to a balancing process.

5. The method according to claim 1, characterized in that The calculating a first difference between the highest voltage of each battery cell to be balanced and the third preset voltage, and determining a balanced capacity value of each battery cell to be balanced according to the first difference, comprises: Calculating a first difference between the highest voltage of each of the battery cells to be balanced and the third preset voltage; If the first difference is greater than 200mv, determining that the equalization capacity value of each battery cell to be balanced is 1% of the rated capacity of the battery cell to be balanced; If the first difference is greater than 150mv, then determining that the equalization capacity value of each battery cell to be balanced is 0.8% of the rated capacity of the battery cell to be balanced; If the first difference is greater than 100 mv, the equalization capacity value of each battery cell to be balanced is determined to be 0.6% of the rated capacity of the battery cell to be balanced; If the first difference is greater than 50 mv, the equalization capacity value of each battery cell to be equalized is determined to be 0.2% of the rated capacity of the battery cell to be equalized.

6. The method according to any one of claims 1 to 5, characterized in that: According to the balanced capacity value of each battery cell to be balanced, the battery cell to be balanced is balanced: Calculating the balancing time of each battery cell to be balanced according to the balancing capacity value of each battery cell to be balanced; Performing equalization processing on the battery cells to be equalized according to the equalization time; The balancing time of the battery cells to be balanced is calculated according to the following formula: T=23.5*C Wherein, T is the balancing time, and C is the balancing capacity value.

7. The method according to claim 1, characterized in that The first preset voltage is 3.45V, the second preset voltage is 3.5V, and the third preset voltage is 3.4V.

8. An energy storage battery equalization processing device, characterized in that: include: An acquisition module, used to acquire the voltage value of each battery cell in the energy storage battery after the energy storage battery is charged, and determine the highest voltage value among the battery cells, wherein the energy storage battery includes a plurality of battery cells; a determination module, configured to compare the voltage of each battery cell with a plurality of different preset voltages to determine the battery cells to be balanced if the maximum voltage of all battery cells in the energy storage battery is greater than a first preset voltage, wherein the plurality of different preset voltages include the first preset voltage, a second preset voltage, and a third preset voltage, wherein the second preset voltage, the first preset voltage, and the third preset voltage decrease in sequence, and the number of the battery cells to be balanced is less than or equal to 25% of the number of all battery cells in the energy storage battery; A calculation module, configured to calculate a first difference between the highest voltage of each battery cell to be balanced and the third preset voltage, and determine a balanced capacity value of each battery cell to be balanced according to the first difference; The processing module is used to perform balancing processing on the battery cells to be balanced according to the balancing capacity value of each battery cell to be balanced.

9. An electronic device, characterized in that: include: processor; as well as A memory having executable codes stored thereon, which, when executed by the processor, causes the processor to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: An executable code is stored thereon, and when the executable code is executed by a processor of an electronic device, the processor is caused to execute the method as claimed in any one of claims 1 to 7.

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