Energy storage battery active balancing method, device, electronic equipment and storage medium

Abstract

The present application provides an active equalization method, device, electronic device and storage medium for energy storage batteries. The method includes: establishing a judgment matrix for active equalization based on the current state of the ith battery cell; determining the memory correction factor of the ith battery cell based on the judgment matrix; wherein the memory correction factor includes the terminal voltage, state of charge, terminal voltage change rate, state of charge change rate, average value of terminal voltage change rate and average value of state of charge change rate; using the memory correction factor, comprehensively evaluating the state of the ith battery cell and actively equalizing it. The present application can more accurately describe the current state of the battery, avoiding misjudgment in active equalization due to SOC estimation error.

Description

Technical Field

[0001] The present application relates to the technical field of equalization circuits, and in particular to an active equalization method, device, electronic device and storage medium for energy storage batteries. Background Art

[0002] The design of the balancing circuit usually takes into account the energy conversion efficiency and balancing accuracy, as well as the anti-interference ability. In practical applications, the balancing circuit may also need to consider the safety and service life of the battery, as well as the characteristic differences of different types of batteries (such as lithium batteries).

[0003] In the active battery balancing strategy, the terminal voltage of the battery cell is detected to determine whether the cell needs to be charged or discharged. The essence of active balancing is to discharge the battery cell with a larger remaining power and charge the battery cell with a smaller remaining power. The evaluation index of the remaining power should be the battery's state of charge (SOC) rather than the terminal voltage. According to the SOC-terminal voltage curve, the two are not linearly related, so balancing control by detecting the terminal voltage is not accurate. However, there is a certain error in SOC estimation, and the reliability of balancing control by predicting SOC is also low. Summary of the invention

[0004] The embodiments of the present application provide a method, device, electronic device and storage medium for active balancing of energy storage batteries to solve the problem of low reliability of active balancing control of batteries.

[0005] In a first aspect, an embodiment of the present application provides an active balancing method for an energy storage battery, comprising:

[0006] According to the current state of the i-th battery cell, a judgment matrix for active balancing is established;

[0007] Determine the memory correction factor of the i-th battery cell according to the judgment matrix; wherein the memory correction factor includes the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the average value of the terminal voltage change rate and the average value of the state of charge change rate;

[0008] The memory correction factor is used to comprehensively evaluate the state of the i-th single battery and actively balance it.

[0009] In a possible implementation, the judgment matrix is ​​a matrix with m rows and 6 columns, wherein m is the number of detections of each battery cell in one detection cycle.

[0010] In a possible implementation, the memory correction factor is used to comprehensively evaluate the state of the i-th single cell, specifically including:

[0011] Respectively determining the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the maximum and minimum values ​​of the average value of the terminal voltage change rate, the maximum and minimum values ​​of the average value of the state of charge change rate, the average value of the terminal voltage, and the average value of the state of charge;

[0012] According to the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the maximum and minimum values ​​of the average value of the terminal voltage change rate, the maximum and minimum values ​​of the average value of the state of charge change rate, the average value of the terminal voltage, and the average value of the state of charge, respectively determine the terminal voltage function, the state of charge function, the terminal voltage change rate function, the state of charge change rate function, the terminal voltage change rate average value function, and the state of charge change rate average value function of the i-th single battery under the k-th detection result;

[0013] Substituting the terminal voltage function, the state of charge function, the terminal voltage change rate function, the state of charge change rate function, the terminal voltage change rate average function and the state of charge change rate average function into a comprehensive evaluation function to obtain a comprehensive evaluation function value;

[0014] A comprehensive evaluation is performed on the state of the i-th single cell according to the comprehensive evaluation function value.

[0015] In a possible implementation, the value of the terminal voltage function includes 1, 0.5, 0, -0.5, -1, the value of the terminal voltage change rate function includes -1, 1, 0, and the value of the terminal voltage change rate average function includes -1, 1, 0.

[0016] In a possible implementation, the state of charge function value includes 1, 0.5, 0, -0.5, -1, the state of charge change rate function value includes -1, 1, 0, and the state of charge change rate average function value includes -1, 1, 0.

[0017] In a possible implementation, the comprehensive evaluation function is positively correlated with the terminal voltage function, the state of charge function, the terminal voltage change rate function, the state of charge change rate function, the terminal voltage change rate average function and the state of charge change rate average function.

[0018] In a possible implementation, the comprehensive evaluation of the state of the i-th single cell is performed according to the comprehensive evaluation function value, specifically:

[0019] evaluating whether the i-th single battery needs to be discharged, and if so, controlling the active balancing power electronic converter to discharge it;

[0020] If discharge is not required, it is determined whether the ith single cell needs to be charged. If charging is required, the active balancing power electronic converter is controlled to charge it. If charging is not required, this round of active balancing ends.

[0021] In a second aspect, an embodiment of the present application provides an active balancing device for an energy storage battery, comprising:

[0022] A judgment matrix establishment module is used to establish an active balancing judgment matrix according to the current state of the i-th battery cell;

[0023] A correction factor determination module, used to determine the memory correction factor of the i-th battery cell according to the judgment matrix; wherein the memory correction factor includes the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the average value of the terminal voltage change rate and the average value of the state of charge change rate;

[0024] The active balancing module is used to use the memory correction factor to comprehensively evaluate the state of the i-th single battery and actively balance it.

[0025] In a third aspect, an embodiment of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method described in the first aspect or any possible implementation of the first aspect are implemented.

[0026] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the steps of the method described in the first aspect or any possible implementation method of the first aspect.

[0027] The embodiment of the present application provides an active equalization method, device, electronic device and storage medium for energy storage batteries. By using the SOC change rate of a single cell as a memory correction factor, combined with battery terminal voltage, battery SOC and other parameters, a judgment matrix for active equalization is established. The corresponding memory correction factor is obtained according to the judgment matrix, and the current state of the single cell is comprehensively evaluated. The battery cells that meet the discharge requirements in the comprehensive evaluation are discharged, and the battery cells that meet the charging requirements are charged. The misjudgment in active equalization caused by SOC estimation error is avoided, thereby increasing the reliability of predicting SOC for equalization control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 This is a flowchart of an implementation method of an active equalization method for energy storage batteries provided in an embodiment of the present application;

[0030] Figure 2 It is a structural schematic diagram of an active equalization device for energy storage batteries provided in one embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0032] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0033] The terms "first", "second", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present application described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0034] Unless otherwise specified, the term "plurality" means two or more. The character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B. The term "and / or" is a description of the association relationship between objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B.

[0035] The words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include the plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variants "comprises" and / or including (comprising) refer to the existence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or these groups. In the absence of more restrictions, the elements defined by the statement "including one..." do not exclude the existence of other identical elements in the process, method or device including the elements.

[0036] In this application, each embodiment may focus on the differences from other embodiments, and the same or similar parts between the embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts may refer to the description of the method part.

[0037] In order to make the purpose, technical solutions and advantages of the present application clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0038] Figure 1 is a flowchart of an implementation method of an energy storage battery active balancing method provided in an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0039] S101 . Establish an active balancing judgment matrix according to the current state of the i-th battery cell.

[0040] Specifically, the judgment matrix is ​​a matrix of m rows and 6 columns, wherein m is the number of detections of each battery cell in a detection cycle. The 6 columns are memory correction factors such as terminal voltage, state of charge, terminal voltage change rate, state of charge change rate, average value of terminal voltage change rate and average value of state of charge change rate.

[0041] The judgment matrix for active balancing is mainly used to judge the current state of the battery cell. Its expression is as follows:

[0042]

[0043] In formula (1), i represents the i-th battery cell. For n battery cells, there are n judgment matrices: k represents the kth detection result under digital control, u and SOC represent the terminal voltage and SOC of the battery cell respectively, du / dt (i.e. ) and dSOC / dt (i.e. ) represent the change rate of the terminal voltage and SOC of the battery cell respectively. Assuming that one detection cycle requires m detections, then and They represent the average values ​​of the battery cell terminal voltage and SOC change rate respectively.

[0044] S102, determining the memory correction factor of the ith battery cell according to the judgment matrix; wherein the memory correction factor includes the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the average terminal voltage change rate and the average state of charge change rate.

[0045] Specifically, according to The battery status can be accurately described as shown in Table 1 below:

[0046] Table 1 Battery status description

[0047]

[0048] S103, using the memory correction factor, comprehensively evaluate the state of the i-th single battery and actively balance it.

[0049] Specifically, step S103 includes:

[0050] S1031. Respectively determine the maximum and minimum values ​​of the terminal voltage, state of charge, terminal voltage change rate, state of charge change rate, average value of the terminal voltage change rate, maximum and minimum values ​​of the average value of the state of charge change rate, average value of the terminal voltage, and average value of the state of charge.

[0051] Among them, the terminal voltage change rate, the state of charge change rate, the average terminal voltage change rate and the average state of charge change rate are all memory correction factors. The memory correction factor is used to correct each sub-function in the comprehensive evaluation function to reduce the error of the comprehensive evaluation, so as to make an accurate comprehensive evaluation of the current state of the single battery. Obtain the maximum and minimum values ​​of the above memory correction factor, namely:

[0052]

[0053]

[0054] The average value of terminal voltage and the average value of the state of charge From the judgment matrix The first and second columns of are accumulated and averaged, that is:

[0055]

[0056] The maximum and minimum values ​​of terminal voltage and state of charge are:

[0057]

[0058]

[0059] S1032. Determine the terminal voltage function, state of charge function, terminal voltage change rate function, state of charge change rate function, terminal voltage change rate average value function, and state of charge change rate average value function of the i-th single cell in the k-th detection result based on the terminal voltage, state of charge, terminal voltage change rate, state of charge change rate, maximum and minimum values ​​of the terminal voltage change rate average value, maximum and minimum values ​​of the state of charge change rate average value, average value of the terminal voltage, and average value of the state of charge.

[0060] Specifically, the values ​​of the functions corresponding to the above six parameters satisfy the following conditions:

[0061] 1) Terminal voltage function f(u i|k ):

[0062] When f(u i|k ) is equal to u max When f(u i|k )=1;

[0063] When f(u i|k ) is greater than and is less than u max When f(u i|k )=0.5;

[0064] When f(u i|k )equal When f(u i|k )=0;

[0065] When f(u i|k ) is less than and greater than u min When f(u i|k )=-0.5;

[0066] When f(u i|k ) is equal to u min When f(u i|k )=-1.

[0067] In the formula, u max is the maximum value of the terminal voltage, u min is the minimum value of the terminal voltage.

[0068] 2) State of charge function f(SOC i|k ):

[0069] When f(SOC i|k ) is equal to SOC max When f(SOC i|k )=1;

[0070] When f(SOC i|k ) is greater than And less than SOC max When f(SOC i|k )=0.5;

[0071] When f(SOC i|k )equal When f(SOC i|k )=0;

[0072] When f(SOC i|k ) is less than And greater than SOC min When f(SOC i|k )=-0.5;

[0073] When f(SOC i|k ) is equal to SOC min :f(SOC i|k )=-1.

[0074] In the formula, SOC max is the maximum value of the state of charge, SOC min is the minimum value of the state of charge.

[0075] 3) Terminal voltage change rate function

[0076] when Equal to max hour,

[0077] when Equal to min hour,

[0078] In other cases,

[0079] In the formula, du max is the maximum value of the terminal voltage change rate, du min is the minimum value of the terminal voltage change rate.

[0080] 4) Charge state change rate function

[0081] when Equal to dSOC max hour,

[0082] when Equal to dSOC min hour,

[0083] In other cases,

[0084] Where, dSOC max is the maximum value of the state of charge change rate, dSOC min is the minimum value of the charge state change rate.

[0085] 5) Average value function of terminal voltage change rate

[0086] when equal hour,

[0087] when equal hour,

[0088] In other cases,

[0089] In the formula, is the maximum value of the average value of the terminal voltage change rate, It is the minimum value of the average value of the terminal voltage change rate.

[0090] 6) Average value function of charge state change rate

[0091] when equal hour,

[0092] when equal hour,

[0093] In other cases,

[0094] In the formula, is the maximum value of the average value of the charge state change rate, It is the minimum value of the average value of the charge state change rate.

[0095] Above, the terminal voltage function f(u i|k ), corresponds to the terminal voltage value of the ith battery at the kth detection;

[0096] State of charge function f(SOC i|k ), corresponding to the charge of the ith battery at the kth detection;

[0097] Terminal voltage change rate function The terminal voltage change rate of the i-th battery at the k-th detection compared to the k-1-th detection;

[0098] State of Charge Change Rate Function The charge state change rate of the corresponding battery at the kth detection compared to the k-1th detection;

[0099] Terminal voltage change rate average function The terminal voltage change rate of the ith battery at the xth test compared to the x-1th test is divided by the test time, and the sum is taken to get the average value;

[0100] State of Charge Change Rate Average Function The charge state change rate of the ith battery at the xth detection compared to the x-1th detection is divided by the detection time, and the sum is taken to get the average value.

[0101] S1033, substituting the terminal voltage function, the state of charge function, the terminal voltage change rate function, the state of charge change rate function, the terminal voltage change rate average function and the state of charge change rate average function into the comprehensive evaluation function to obtain the comprehensive evaluation function value.

[0102] The comprehensive evaluation function is established as follows:

[0103]

[0104] In the formula, k1~k6 are weight coefficients of terminal voltage function, state of charge function, terminal voltage change rate function, state of charge change rate function, terminal voltage change rate average function and state of charge change rate average function, which can be all 1 and can be adjusted according to the actual project. The value of D can be calculated by formula (7). When D is greater than 0, the single cell is discharged; when D is less than 0, the single cell is charged, thereby realizing active balancing of the battery pack. Active balancing is based on the aging degree of the single cell. If the aging degree of a single cell is high, the corresponding weight coefficient can be increased, and if the aging degree is low, the weight coefficient can be reduced. It should be noted here that since the battery state is constantly changing, continuous judgment is required.

[0105] The embodiment of the present application uses the SOC change rate of the single battery as a memory correction factor, combined with battery terminal voltage, battery SOC and other parameters, to establish an active balancing judgment matrix, and comprehensively evaluates the current state of the single battery according to the memory correction factor obtained by the judgment matrix, discharges the battery cells that meet the discharge requirements, and charges the battery cells that meet the charging requirements. This avoids misjudgment in active balancing due to SOC estimation errors, thereby increasing the reliability of predicting SOC for balancing control.

[0106] In a possible implementation, step S103, based on the comprehensive evaluation function value, comprehensively evaluates the state of the i-th single cell, specifically:

[0107] Evaluate whether the i-th single cell needs to be discharged, and if necessary, control the active balancing power electronic converter to discharge it;

[0108] If discharge is not required, it is determined whether the i-th single cell needs to be charged. If charging is required, the active balancing power electronic converter is controlled to charge it. If charging is not required, this round of active balancing ends.

[0109] It should be understood that the order of execution of each step in the above embodiment does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The method of the present application can more accurately describe the current state of the battery, avoid misjudgment in active equalization due to SOC estimation error, and is independent of the power electronic topology of active equalization, and has universality.

[0110] The following is an embodiment of the device of the present application. For details not described in detail, please refer to the corresponding method embodiment described above.

[0111] Figure 2 is a structural diagram of an active equalization device for energy storage batteries provided in one embodiment of the present application, such as Figure 2 For the sake of convenience, only the parts related to the embodiment of the present application are shown. Figure 2 As shown, the device comprises:

[0112] A judgment matrix establishment module 201 is used to establish an active balancing judgment matrix according to the current state of the i-th battery cell;

[0113] The correction factor determination module 202 is used to determine the memory correction factor of the i-th battery cell according to the judgment matrix; wherein the memory correction factor includes the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the average value of the terminal voltage change rate and the average value of the state of charge change rate;

[0114] The active balancing module 203 is used to use the memory correction factor to comprehensively evaluate the state of the i-th single battery and actively balance it.

[0115] The embodiment of the present application uses the SOC change rate of a single cell as a memory correction factor, combined with parameters such as the battery terminal voltage and the battery SOC, to establish a judgment matrix for active balancing. Based on each memory correction factor, a comprehensive evaluation is performed on the current state of the single cell, and the battery cells that meet the discharge requirements in the comprehensive evaluation are discharged, and the battery cells that meet the charging requirements are charged. This avoids misjudgment in active balancing due to SOC estimation errors, thereby increasing the reliability of balancing control by predicting SOC.

[0116] In a possible implementation, the active balancing module 203 is specifically configured to:

[0117] respectively determining the terminal voltage, state of charge, terminal voltage change rate, state of charge change rate, average value of the terminal voltage change rate, maximum and minimum values ​​of the average value of the state of charge change rate, and average values ​​of the terminal voltage and state of charge;

[0118] Determine the terminal voltage function, state of charge function, terminal voltage change rate function, state of charge change rate function, terminal voltage change rate average function, and state of charge change rate average function of the i-th single battery under the k-th detection result, respectively, based on the terminal voltage, state of charge, terminal voltage change rate, state of charge change rate, terminal voltage change rate average function, and state of charge change rate average function;

[0119] Substituting the terminal voltage function, the state of charge function, the terminal voltage change rate function, the state of charge change rate function, the terminal voltage change rate average function and the state of charge change rate average function into the comprehensive evaluation function to obtain the comprehensive evaluation function value;

[0120] According to the comprehensive evaluation function value, the state of the i-th single cell is comprehensively evaluated.

[0121] Figure 3 Schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Figure 3 As shown, the electronic device 3 of this embodiment includes: a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30. When the processor 30 executes the computer program 32, the steps in the above-mentioned embodiments of the active balancing method for energy storage batteries are implemented, such as Figure 1 Alternatively, when the processor 30 executes the computer program 32, the functions of each module / unit in the above-mentioned device embodiments are implemented, for example Figure 2 The functions of each module are shown.

[0122] Exemplarily, the computer program 32 may be divided into one or more modules / units, one or more modules / units are stored in the memory 31 and executed by the processor 30 to complete the present application. The one or more modules / units may be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program 32 in the electronic device 3. For example, the computer program 32 may be divided into Figure 2 The modules shown.

[0123] The electronic device 3 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The electronic device 3 may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will appreciate that Figure 3 It is only an example of the electronic device 3 and does not constitute a limitation of the electronic device 3. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0124] The processor 30 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 any conventional processor, etc.

[0125] The memory 31 may be an internal storage unit of the electronic device 3, such as a hard disk or memory of the electronic device 3. The memory 31 may also be an external storage device of the electronic device 3, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 3. Further, the memory 31 may also include both an internal storage unit of the electronic device 3 and an external storage device. The memory 31 is used to store computer programs and other programs and data required by the electronic device. The memory 31 may also be used to temporarily store data that has been output or is to be output.

[0126] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0127] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0128] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0129] In the embodiments provided in the present application, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0130] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0131] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0132] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, the steps of the above-mentioned each energy storage battery active balancing method embodiment can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device that can carry computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0133] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An active equalization method for energy storage batteries, characterized in that: include: According to the current state of the i-th battery cell, an active balancing judgment matrix is ​​established; According to the judgment matrix, the memory correction factor of the i-th battery cell is determined; wherein the memory correction factor includes the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the average value of the terminal voltage change rate and the average value of the state of charge change rate; wherein the judgment matrix is ​​a matrix of m rows and 6 columns; m is the number of detections of each battery cell in a detection cycle; Using the memory correction factor, comprehensively evaluating the state of the i-th single battery and actively balancing it; The step of using the memory correction factor to comprehensively evaluate the state of the i-th single cell specifically includes: Respectively determining the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the maximum and minimum values ​​of the average value of the terminal voltage change rate, the maximum and minimum values ​​of the average value of the state of charge change rate, the average value of the terminal voltage, and the average value of the state of charge; According to the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the maximum and minimum values ​​of the average value of the terminal voltage change rate, the maximum and minimum values ​​of the average value of the state of charge change rate, the average value of the terminal voltage, and the average value of the state of charge, respectively determine the terminal voltage function, the state of charge function, the terminal voltage change rate function, the state of charge change rate function, the terminal voltage change rate average value function, and the state of charge change rate average value function of the i-th single battery under the k-th detection result; Substituting the terminal voltage function, the state of charge function, the terminal voltage change rate function, the state of charge change rate function, the terminal voltage change rate average function and the state of charge change rate average function into a comprehensive evaluation function to obtain a comprehensive evaluation function value; Performing a comprehensive evaluation on the state of the i-th single cell according to the comprehensive evaluation function value; The judgment matrix of the active balance is: Among them, i represents the i-th battery cell. For n battery cells, there are n judgment matrices , … , k represents the kth detection result under digital control, u and SOC represent the terminal voltage and SOC of the battery cell respectively, and They represent the change rate of the terminal voltage and SOC of the battery cell respectively. One detection cycle requires m detections. and Respectively represent the average values ​​of battery cell terminal voltage and SOC change rate; The comprehensive evaluation function is: Among them, k1~k6 are weight coefficients of the terminal voltage function, state of charge function, terminal voltage change rate function, state of charge change rate function, terminal voltage change rate average function and state of charge change rate average function respectively. When D is greater than 0, the single cell is discharged; when D is less than 0, the single cell is charged.

2. The active equalization method for energy storage batteries according to claim 1, characterized in that: The values ​​of the terminal voltage function include 1, 0.5, 0, -0.5, -1, the values ​​of the terminal voltage change rate function include -1, 1, 0, and the values ​​of the terminal voltage change rate average value function include -1, 1, 0.

3. The active equalization method for energy storage batteries according to claim 1, characterized in that: The state of charge function value includes 1, 0.5, 0, -0.5, -1, the state of charge change rate function value includes -1, 1, 0, and the state of charge change rate average value function value includes -1, 1, 0.

4. The active equalization method for energy storage batteries according to claim 1, characterized in that: The comprehensive evaluation function is positively correlated with the terminal voltage function, the state of charge function, the terminal voltage change rate function, the state of charge change rate function, the terminal voltage change rate average function and the state of charge change rate average function.

5. The active equalization method for energy storage batteries according to claim 1, characterized in that: The comprehensive evaluation of the state of the i-th single battery is performed according to the comprehensive evaluation function value, specifically: evaluating whether the i-th single battery needs to be discharged, and if so, controlling the active balancing power electronic converter to discharge it; If discharge is not required, it is determined whether the ith single cell needs to be charged. If charging is required, the active balancing power electronic converter is controlled to charge it. If charging is not required, this round of active balancing ends.

6. An active equalization device for an energy storage battery for executing the active equalization method for an energy storage battery according to any one of claims 1 to 5, characterized in that: include: A judgment matrix establishment module is used to establish an active balancing judgment matrix according to the current state of the i-th battery cell; A correction factor determination module, used to determine the memory correction factor of the i-th battery cell according to the judgment matrix; wherein the memory correction factor includes the terminal voltage, the state of charge, the terminal voltage change rate, the state of charge change rate, the average value of the terminal voltage change rate and the average value of the state of charge change rate; The active balancing module is used to use the memory correction factor to comprehensively evaluate the state of the i-th single battery and actively balance it.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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