Battery module voltage difference analysis method, electronic equipment and storage medium

Abstract

The invention discloses a battery module voltage difference analysis method, electronic equipment and a storage medium. The analysis method comprises the following steps: acquiring a self-discharge current of a preset abnormal battery cell, and determining a calculated capacity difference between the preset abnormal battery cell and a preset conventional battery cell after each test cycle according to the self-discharge current; determining a calculated capacity difference-voltage difference relation curve according to the calculated capacity difference after each test cycle and the voltage difference between the preset conventional battery cell and the preset abnormal battery cell; determining the actual capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle according to the charging and discharging curve of the preset conventional battery cell and the preset abnormal battery cell; determining an actual capacity difference-pressure difference curve according to the actual capacity difference and the pressure difference of each test cycle; and according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, determining the reason of the pressure difference of the battery module. According to the invention, whether the voltage difference of the battery module is caused by the abnormal voltage drop of the preset abnormal battery cell in unit time can be accurately judged.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery module pressure difference analysis method, electronic equipment and storage medium. Background Art

[0002] In the prior art, when a battery module pressure difference is abnormal, the cause of failure is usually confirmed by starting with the faulty module with a large pressure difference, and then disassembling the battery cell through conventional fault analysis methods such as capacity, DC internal resistance, disassembly and self-discharge analysis. However, only by disassembling the battery cell, it is difficult to have sufficient evidence to prove whether the root cause of the failure is caused by an abnormal voltage drop of the battery cell within a unit time, that is, an abnormal K value of the battery cell. Summary of the invention

[0003] The present invention provides a battery module pressure difference analysis method, electronic equipment and storage medium to accurately determine whether the battery module pressure difference is caused by an abnormal voltage drop of a preset abnormal battery cell per unit time.

[0004] According to one aspect of the present invention, a battery module pressure difference analysis method is provided, and the battery module pressure difference analysis method comprises:

[0005] Obtain the self-discharge current of the preset abnormal battery cell in the battery module, and determine the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the self-discharge current; wherein the voltage difference between the preset abnormal battery cell and the preset normal battery cell in the battery module is the largest, the preset abnormal battery cell is a battery cell whose voltage drop per unit time is outside the preset range, and the preset normal battery cell is a battery cell whose voltage drop per unit time is within the preset range;

[0006] Determine a calculated capacity difference-pressure difference relationship curve of the preset abnormal cell according to the calculated capacity difference between the preset abnormal cell and the preset normal cell after each test cycle, and the pressure difference between the preset normal cell and the preset abnormal cell;

[0007] Determine the actual capacity difference between the preset abnormal cell and the preset normal cell after each test cycle according to the preset charge and discharge curve of the normal cell and the preset charge and discharge curve of the abnormal cell;

[0008] Determine an actual capacity difference-pressure difference curve of a preset abnormal cell according to the actual capacity difference of each test cycle and the pressure difference between a preset normal cell and a preset abnormal cell;

[0009] Determine the cause of the battery module pressure difference based on the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve.

[0010] Further, the calculated capacity difference includes a charge calculated capacity difference and a discharge calculated capacity difference;

[0011] The calculated capacity difference-pressure difference relationship curve includes a charging calculated capacity difference-pressure difference relationship curve and a discharging calculated capacity difference-pressure difference relationship curve;

[0012] The actual capacity difference includes the actual capacity difference of charging and the actual capacity difference of discharging;

[0013] The actual capacity difference-pressure difference curve includes a charging actual capacity difference-pressure difference curve and a discharging actual capacity difference-pressure difference curve;

[0014] According to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, determine the cause of the battery module pressure difference, including:

[0015] Compare the discharge calculated capacity difference-pressure difference curve with the discharge actual capacity difference-pressure difference curve, and compare the charge calculated capacity difference-pressure difference curve with the charge actual capacity difference-pressure difference curve to determine the cause of the battery module pressure difference.

[0016] Further, determining the actual capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the preset charge and discharge curve of the normal battery cell and the preset charge and discharge curve of the abnormal battery cell includes:

[0017] Determine the difference in actual discharge capacity between the preset abnormal cell and the preset normal cell after each test cycle according to the discharge curve of the preset abnormal cell and the discharge curve of the preset normal cell;

[0018] The actual charging capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined according to the charging curve of the preset abnormal battery cell and the charging curve of the preset normal battery cell.

[0019] Furthermore, the self-discharge current of the preset abnormal battery cell in the battery module is obtained, and the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined according to the self-discharge current, including:

[0020] Obtaining a self-discharge current of a preset abnormal battery cell in the battery module, and determining a first capacity difference between the preset abnormal battery cell and the preset normal battery cell in each test cycle according to the self-discharge current;

[0021] The calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined according to the first capacity difference in each test cycle and the sum of the first capacity difference in each test cycle before the test cycle.

[0022] Further, determining a first capacity difference between a preset abnormal battery cell and a preset normal battery cell in each test cycle according to the self-discharge current includes:

[0023] Determine the charge capacity difference based on the self-discharge current and the charge time in each test cycle;

[0024] Determine a first static capacity difference according to the self-discharge current and the first static time in each test cycle; wherein the first static time is the time interval between the end of the charging test and the start of the discharging test in each test cycle;

[0025] Determine the discharge capacity difference based on the self-discharge current and the discharge time in each test cycle;

[0026] Determine the second static capacity difference according to the self-discharge current and the second static time in each test cycle; wherein the second static time is the time interval after the end of the discharge test in each test cycle and before the start of the charging test in the next test cycle;

[0027] The first capacity difference is determined based on the charge capacity difference, the first rest capacity difference, the discharge capacity difference, and the second rest capacity difference.

[0028] Further, determining the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the first capacity difference in each test cycle and the sum of the first capacity difference in each test cycle before the test cycle includes:

[0029] Determine the charge calculation capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the charge capacity difference and the first rest capacity difference in each test cycle, and the sum of the charge capacity difference in each test cycle before the test cycle and the sum of the first rest capacity difference in each test cycle;

[0030] The discharge calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined based on the discharge capacity difference and the second resting capacity difference in each test cycle, as well as the sum of the discharge capacity difference in each test cycle before the test cycle and the sum of the second resting capacity difference in each test cycle; wherein the calculated capacity difference includes the charge calculated capacity difference and the discharge calculated capacity difference.

[0031] Further, according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, the cause of the battery module pressure difference is determined, and then it also includes:

[0032] Determine the voltage drop ratio between the self-discharge current and the voltage drop of the preset abnormal battery cell per unit time;

[0033] According to the voltage drop proportional relationship, the corresponding relationship between the self-discharge current and the calculated capacity, and the calculated capacity difference-pressure difference relationship curve, the corresponding relationship between the voltage drop of the preset abnormal battery cell per unit time and the pressure difference in the calculated capacity difference-pressure difference relationship curve is determined.

[0034] Furthermore, the self-discharge current of the preset abnormal battery cell in the battery module is obtained, including:

[0035] The self-discharge current of the preset abnormal cell in the battery module is determined according to the preset placement time, the capacity of the preset abnormal cell at the initial moment, and the capacity of the preset abnormal cell after being placed for the preset placement time.

[0036] Furthermore, the abnormal battery cell is preset as the battery cell with the largest voltage drop per unit time in the battery module.

[0037] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0038] at least one processor; and

[0039] a memory communicatively connected to the at least one processor; wherein,

[0040] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the battery module pressure difference analysis method described in any embodiment of the present invention.

[0041] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the battery module pressure difference analysis method described in any embodiment of the present invention when executed.

[0042] The battery module pressure difference analysis method designed in the embodiment of the present invention obtains the self-discharge current of the preset abnormal battery cell in the battery module, determines the calculated capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle according to the self-discharge current, determines the calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell according to the calculated capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle, and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell, determines the actual capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle according to the charge and discharge curve of the preset conventional battery cell and the charge and discharge curve of the preset abnormal battery cell, determines the actual capacity difference-pressure difference curve of the preset abnormal battery cell according to the actual capacity difference of each test cycle and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell, determines the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, so as to accurately judge whether the battery module pressure difference is caused by the abnormal voltage drop of the preset abnormal battery cell per unit time.

[0043] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 is a flow chart of a battery module pressure difference analysis method provided according to an embodiment of the present invention;

[0046] Figure 2 is a flow chart of another battery module pressure difference analysis method provided according to an embodiment of the present invention;

[0047] Figure 3 is a flow chart of another method for determining a blast furnace permeability index provided according to an embodiment of the present invention;

[0048] Figure 4 A schematic diagram of the structure of an electronic device that can be used to implement an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention 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 data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] The embodiment of the present invention provides a battery module pressure difference analysis method. Figure 1 is a flow chart of a battery module pressure difference analysis method provided according to an embodiment of the present invention, referring to Figure 1 , the battery module pressure difference analysis method includes:

[0052] S110. Obtain the self-discharge current of the preset abnormal battery cell in the battery module, and determine the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle based on the self-discharge current; wherein, the voltage difference between the preset abnormal battery cell and the preset normal battery cell in the battery module is the largest, the preset abnormal battery cell is a battery cell whose voltage drop per unit time is outside a preset range, and the preset normal battery cell is a battery cell whose voltage drop per unit time is within a preset range.

[0053] Among them, each preset abnormal cell in the battery module can be selected for battery module pressure difference analysis, or only the preset abnormal cell with the largest voltage drop per unit time in the battery module can be selected for battery module pressure difference analysis, which is not limited in the embodiment of the present invention. And the preset range can be set according to actual conditions.

[0054] Specifically, the self-discharge current of the preset abnormal cell in the battery module can be determined according to the preset placement time, the capacity of the preset abnormal cell at the initial moment, and the capacity of the preset abnormal cell after being placed for the preset placement time, and the first capacity difference between the preset abnormal cell and the preset normal cell in each test cycle can be determined according to the self-discharge current, and the calculated capacity difference between the preset abnormal cell and the preset normal cell after each test cycle can be determined according to the sum of the first capacity difference in each test cycle and the first capacity difference in each test cycle before the test cycle. The calculated capacity difference includes the charging calculated capacity difference and the discharging calculated capacity difference.

[0055] S120, determining a calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell according to the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle, and the pressure difference between the preset normal battery cell and the preset abnormal battery cell.

[0056] Specifically, the charging calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell can be determined according to the charging calculated capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle, and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell after each test cycle; at the same time, the discharge calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell can be determined according to the discharge calculated capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle, and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell after each test cycle.

[0057] S130, determining an actual capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the preset charge and discharge curve of the normal battery cell and the preset charge and discharge curve of the abnormal battery cell.

[0058] Specifically, the actual discharge capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle can be determined based on the discharge curve of the preset abnormal battery cell and the discharge curve of the preset normal battery cell, and the actual charging capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle can be determined based on the charging curve of the preset abnormal battery cell and the charging curve of the preset normal battery cell.

[0059] S140, determining an actual capacity difference-pressure difference curve of a preset abnormal battery cell according to the actual capacity difference of each test cycle and the pressure difference between the preset normal battery cell and the preset abnormal battery cell.

[0060] Specifically, the actual discharge capacity difference-pressure difference curve of the preset abnormal battery cell can be determined according to the actual discharge capacity difference of each test cycle and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell, and the actual charging capacity difference-pressure difference curve of the preset abnormal battery cell can be determined according to the actual charging capacity difference of each test cycle and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell.

[0061] S150 , determining the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve.

[0062] Specifically, the calculated capacity difference-pressure difference curve is compared with the actual capacity difference-pressure difference curve. If the calculated capacity difference-pressure difference curve has a high degree of overlap with the actual capacity difference-pressure difference curve, it is judged that the battery module pressure difference is caused by the abnormal voltage drop of the preset abnormal battery cell per unit time, that is, it is caused by the abnormal K value of the preset abnormal battery cell; if the calculated capacity difference-pressure difference curve has a low degree of overlap with the actual capacity difference-pressure difference curve, it is judged that the battery module pressure difference is not caused by the abnormal voltage drop of the preset abnormal battery cell per unit time.

[0063] The battery module pressure difference analysis method designed in the embodiment of the present invention obtains the self-discharge current of the preset abnormal battery cell in the battery module, determines the calculated capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle according to the self-discharge current, determines the calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell according to the calculated capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle, and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell, determines the actual capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle according to the charge and discharge curve of the preset conventional battery cell and the charge and discharge curve of the preset abnormal battery cell, determines the actual capacity difference-pressure difference curve of the preset abnormal battery cell according to the actual capacity difference of each test cycle and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell, determines the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, so as to accurately judge whether the battery module pressure difference is caused by the abnormal voltage drop of the preset abnormal battery cell per unit time.

[0064] Further, the calculated capacity difference includes a charge calculated capacity difference and a discharge calculated capacity difference;

[0065] The calculated capacity difference-pressure difference relationship curve includes a charging calculated capacity difference-pressure difference relationship curve and a discharging calculated capacity difference-pressure difference relationship curve;

[0066] The actual capacity difference includes the actual capacity difference of charging and the actual capacity difference of discharging;

[0067] The actual capacity difference-pressure difference curve includes a charging actual capacity difference-pressure difference curve and a discharging actual capacity difference-pressure difference curve;

[0068] According to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, determine the cause of the battery module pressure difference, including:

[0069] Compare the discharge calculated capacity difference-pressure difference curve with the discharge actual capacity difference-pressure difference curve, and compare the charge calculated capacity difference-pressure difference curve with the charge actual capacity difference-pressure difference curve to determine the cause of the battery module pressure difference.

[0070] Among them, the difference in charging calculated capacity can be understood as the self-consumption behavior during the charging process; the difference in discharge calculated capacity can be understood as the self-consumption behavior during the discharge process.

[0071] Specifically, compare the discharge calculated capacity difference-pressure difference curve with the discharge actual capacity difference-pressure difference curve, and compare the charge calculated capacity difference-pressure difference curve with the charge actual capacity difference-pressure difference curve. If the overlap between the discharge calculated capacity difference-pressure difference curve and the discharge actual capacity difference-pressure difference curve, and the charge calculated capacity difference-pressure difference curve and the charge actual capacity difference-pressure difference curve are both high, it is judged that the battery module pressure difference is caused by the abnormal voltage drop of the preset abnormal battery cell per unit time, that is, caused by the abnormal K value of the preset abnormal battery cell; if the overlap between the discharge calculated capacity difference-pressure difference curve and the discharge actual capacity difference-pressure difference curve, and / or the charge calculated capacity difference-pressure difference curve and the charge actual capacity difference-pressure difference curve is low, it is judged that the battery module pressure difference is not caused by the abnormal voltage drop of the preset abnormal battery cell per unit time.

[0072] Further, determining the actual capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the preset charge and discharge curve of the normal battery cell and the preset charge and discharge curve of the abnormal battery cell includes:

[0073] Determine the difference in actual discharge capacity between the preset abnormal cell and the preset normal cell after each test cycle according to the discharge curve of the preset abnormal cell and the discharge curve of the preset normal cell;

[0074] The actual charging capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined according to the charging curve of the preset abnormal battery cell and the charging curve of the preset normal battery cell.

[0075] Specifically, when determining the actual discharge capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each discharge test cycle according to the discharge curve of the preset abnormal battery cell and the discharge curve of the preset conventional battery cell, since the voltage drop of the preset abnormal battery cell decreases faster per unit time, when the voltage drop of the preset abnormal battery cell is discharged to the minimum voltage drop, the voltage drop of the preset conventional battery cell has not yet been discharged to the minimum voltage drop, and has a certain deviation from the voltage drop of the preset abnormal battery cell, at this time, according to the voltage drop of the preset conventional battery cell and in combination with the discharge curve of the preset abnormal battery cell, the first battery cell capacity value corresponding to the voltage drop of the preset conventional battery cell at this moment can be found in the discharge curve of the preset abnormal battery cell, and the first battery cell capacity value can be compared with the voltage drop of the preset abnormal battery cell. The second battery cell capacity value corresponding to the lowest voltage drop is subtracted to determine the actual discharge capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each discharge test cycle. For example, if after a certain discharge test cycle, the voltage drop of the preset abnormal battery cell is 2.5V, and the voltage drop corresponding to the preset conventional battery cell is 3.0V, then the discharge curve of the preset abnormal battery cell can be combined to find the first battery cell capacity value corresponding to the voltage drop of 3.0V of the preset conventional battery cell in the discharge curve of the preset abnormal battery cell, and the first battery cell capacity value is subtracted from the second battery cell capacity value corresponding to the voltage drop of 2.5V of the preset abnormal battery cell to determine the actual discharge capacity difference between the preset abnormal battery cell and the preset conventional battery cell after the discharge test cycle.

[0076] When determining the actual charging capacity difference between the preset abnormal cell and the preset conventional cell after each test cycle according to the charging curve of the preset abnormal cell and the charging curve of the preset conventional cell, since there is a certain deviation between the voltage drop of the preset abnormal cell and the voltage drop of the preset conventional cell after the discharge test, when the voltage drop of the preset conventional cell is charged to the maximum voltage drop, the voltage drop of the preset abnormal cell has not yet been charged to the maximum voltage drop, and there is a certain deviation from the voltage drop of the preset conventional cell. At this time, according to the voltage drop of the preset abnormal cell and the charging curve of the preset conventional cell, the third cell capacity value corresponding to the voltage drop of the preset abnormal cell at this moment can be found in the charging curve of the preset conventional cell, and the maximum voltage drop of the preset conventional cell can be calculated. The corresponding fourth battery cell capacity value is subtracted from the third battery cell capacity value to determine the actual charging capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each charging test cycle. For example, if after a certain charging test cycle, the voltage drop of the preset abnormal battery cell is 4.1V, and the corresponding voltage drop of the preset conventional battery cell is 4.2V, then the charging curve of the preset conventional battery cell can be combined to find the third battery cell capacity value corresponding to the voltage drop of 4.1 of the preset abnormal battery cell at this moment in the charging curve of the preset conventional battery cell, and the fourth battery cell capacity value corresponding to the maximum voltage drop of 4.2 of the preset conventional battery cell is subtracted from the third battery cell capacity value to determine the charge and discharge capacity difference between the preset abnormal battery cell and the preset conventional battery cell after the charging test cycle.

[0077] The present embodiment is based on the above embodiment and optimizes the above embodiment by optimizing the step of "preset self-discharge current of abnormal cells in the module, and determine the calculated capacity difference between the preset abnormal cells and the preset normal cells after each test cycle according to the self-discharge current" to "obtain the self-discharge current of abnormal cells in the battery module, and determine the first capacity difference between the preset abnormal cells and the preset normal cells in each test cycle according to the self-discharge current; determine the calculated capacity difference between the preset abnormal cells and the preset normal cells after each test cycle according to the first capacity difference in each test cycle and the sum of the first capacity difference in each test cycle before the test cycle". Figure 2 is a flow chart of another battery module pressure difference analysis method provided according to an embodiment of the present invention, referring to Figure 2 , the optimized battery module pressure difference analysis method includes:

[0078] S211, obtaining a self-discharge current of a preset abnormal battery cell in the battery module, and determining a first capacity difference between the preset abnormal battery cell and the preset normal battery cell in each test cycle according to the self-discharge current.

[0079] Specifically, the charging capacity difference is determined according to the self-discharge current and the charging time in each test cycle, the first resting capacity difference is determined according to the self-discharge current and the first resting time in each test cycle, wherein the first resting time is the time interval between the end of the charging test and the start of the discharge test in each test cycle, the discharge capacity difference is determined according to the self-discharge current and the discharge time in each test cycle, the second resting capacity difference is determined according to the self-discharge current and the second resting time in each test cycle, wherein the second resting time is the time interval between the end of the discharge test in each test cycle and the start of the charging test in the next test cycle, and the first capacity difference is determined according to the charging capacity difference, the first resting capacity difference, the discharge capacity difference, and the second resting capacity difference.

[0080] S212, determining a calculated capacity difference between a preset abnormal battery cell and a preset normal battery cell after each test cycle according to the first capacity difference in each test cycle and the sum of the first capacity difference in each test cycle before the test cycle.

[0081] Specifically, the charging calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined according to the charging capacity difference and the first resting capacity difference in each test cycle, as well as the sum of the charging capacity difference in each test cycle before the test cycle and the sum of the first resting capacity difference in each test cycle; the discharge calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined according to the discharge capacity difference and the second resting capacity difference in each test cycle, as well as the sum of the discharge capacity difference in each test cycle before the test cycle and the sum of the second resting capacity difference in each test cycle; wherein the calculated capacity difference includes the charging calculated capacity difference and the discharging calculated capacity difference.

[0082] S220, determining a calculated capacity difference-pressure difference relationship curve of the abnormal cell according to the calculated capacity difference between the abnormal cell and the preset normal cell after each test cycle, and the pressure difference between the preset normal cell and the preset abnormal cell.

[0083] Specifically, this step has the same function as step S120 and will not be described in detail here.

[0084] S230, determining an actual capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the preset charge and discharge curve of the normal battery cell and the preset charge and discharge curve of the abnormal battery cell.

[0085] Specifically, this step has the same function as step S130 and will not be described in detail here.

[0086] S240 , determining an actual capacity difference-pressure difference curve of the abnormal battery cell according to the actual capacity difference of each test cycle and the pressure difference between the preset normal battery cell and the preset abnormal battery cell.

[0087] Specifically, this step has the same function as step S140 and will not be described in detail here.

[0088] S250 , determining the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve.

[0089] Specifically, this step has the same function as step S150, and will not be described in detail here.

[0090] The battery module pressure difference analysis method designed in the embodiment of the present invention obtains the self-discharge current of the preset abnormal battery cell in the battery module, determines the first capacity difference between the preset abnormal battery cell and the preset normal battery cell in each test cycle according to the self-discharge current, determines the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the first capacity difference in each test cycle and the sum of the first capacity difference in each test cycle before the test cycle, thereby making the calculation of the calculated capacity difference more accurate, and then determines the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell, as well as the preset normal battery cell and the preset abnormal battery cell. The calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell is determined according to the pressure difference. The actual capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle is determined according to the charge and discharge curve of the preset conventional battery cell and the charge and discharge curve of the preset abnormal battery cell. The actual capacity difference-pressure difference curve of the preset abnormal battery cell is determined according to the actual capacity difference of each test cycle and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell. The cause of the battery module pressure difference is determined according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, so as to further improve the accuracy of judging whether the battery module pressure difference is caused by the abnormal voltage drop of the preset abnormal battery cell per unit time.

[0091] Further, determining a first capacity difference between a preset abnormal battery cell and a preset normal battery cell in each test cycle according to the self-discharge current includes:

[0092] Determine the charge capacity difference based on the self-discharge current and the charge time in each test cycle;

[0093] Determine a first static capacity difference according to the self-discharge current and the first static time in each test cycle; wherein the first static time is the time interval between the end of the charging test and the start of the discharging test in each test cycle;

[0094] Determine the discharge capacity difference based on the self-discharge current and the discharge time in each test cycle;

[0095] Determine the second static capacity difference according to the self-discharge current and the second static time in each test cycle; wherein the second static time is the time interval after the end of the discharge test in each test cycle and before the start of the charging test in the next test cycle;

[0096] The first capacity difference is determined based on the charge capacity difference, the first rest capacity difference, the discharge capacity difference, and the second rest capacity difference.

[0097] Specifically, the self-discharge current is multiplied by the charging time in each test cycle to determine the charging capacity difference, that is, the additional capacity loss of the preset abnormal battery during the charging process. For example, the charging capacity difference △C1 = self-discharge current Is*charging time Tc. The self-discharge current is multiplied by the first resting time in each test cycle to determine the first resting capacity difference, that is, the additional capacity loss of the preset abnormal battery in the time interval from the end of the charging test to the start of the discharge test. For example, the first resting capacity difference △Cm = self-discharge current Is*first resting time Tm. The self-discharge current is multiplied by the discharge time in each test cycle to determine the discharge capacity difference, that is, the additional capacity loss of the preset abnormal battery during the discharge process. For example, the discharge capacity difference △C2 = self-discharge current Is*charging time Tf. The self-discharge current is multiplied by the second resting time in each test cycle to determine the second resting capacity difference, that is, the additional capacity loss of the preset abnormal battery in the time interval from the end of the discharge test to the start of the charging test of the next test cycle. For example, the second resting capacity difference △Cn = self-discharge current Is*second resting time Tn.

[0098] Further, determining the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the first capacity difference in each test cycle and the sum of the first capacity difference in each test cycle before the test cycle includes:

[0099] Determine the charge calculation capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the charge capacity difference and the first rest capacity difference in each test cycle, and the sum of the charge capacity difference in each test cycle before the test cycle and the sum of the first rest capacity difference in each test cycle;

[0100] The discharge calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined based on the discharge capacity difference and the second resting capacity difference in each test cycle, as well as the sum of the discharge capacity difference in each test cycle before the test cycle and the sum of the second resting capacity difference in each test cycle; wherein the calculated capacity difference includes the charge calculated capacity difference and the discharge calculated capacity difference.

[0101] Specifically, the charging capacity difference and the first resting capacity difference in each test cycle, as well as the sum of the charging capacity difference in each test cycle before the test cycle and the sum of the first resting capacity difference in each test cycle are added to determine the charging calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle. For example, the charging calculated capacity difference ΔC 充 = The sum of the charge capacity differences in each test cycle before the test cycle △C 上一轮充电 + The sum of the differences in the first rest capacity in each test cycle before the test cycle △C 上一轮第一静置 + the charging capacity difference △C1 of this cycle + the first static capacity difference △Cm of this cycle.

[0102] The discharge capacity difference and the second rest capacity difference in each test cycle, as well as the sum of the discharge capacity difference in each test cycle before the test cycle and the sum of the second rest capacity difference in each test cycle are added to determine the discharge calculated capacity difference between the preset abnormal cell and the preset normal cell after each test cycle. For example, the discharge calculated capacity difference ΔC 放 = The sum of the discharge capacity differences in each test cycle before the test cycle △C 上一轮放电 + The sum of the second rest capacity differences in each test cycle before the test cycle △C 上一轮第二静置 + the discharge capacity difference of this cycle △C2 + the second static capacity difference of this cycle △Cn.

[0103] The present embodiment is based on the above embodiment and optimizes the above embodiment. After the step of "determining the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve", the step of "determining the voltage drop proportional relationship between the self-discharge current and the voltage drop of the preset abnormal battery cell per unit time; determining the corresponding relationship between the voltage drop of the abnormal battery cell per unit time and the pressure difference in the calculated capacity difference-pressure difference relationship curve according to the voltage drop proportional relationship, the corresponding relationship between the self-discharge current and the calculated capacity and the calculated capacity difference-pressure difference relationship curve" is added. Figure 3 is a flow chart of another method for determining a blast furnace permeability index according to an embodiment of the present invention, with reference to Figure 3 , the optimized method for determining the blast furnace permeability index includes:

[0104] S310. Obtain the self-discharge current of the preset abnormal battery cell in the battery module, and determine the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle based on the self-discharge current; wherein, the voltage difference between the preset abnormal battery cell and the preset normal battery cell in the battery module is the largest, the preset abnormal battery cell is a battery cell whose voltage drop per unit time is outside a preset range, and the preset normal battery cell is a battery cell whose voltage drop per unit time is within a preset range.

[0105] Specifically, this step has the same function as step S110 and will not be described in detail here.

[0106] S320, determining a calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell according to the calculated capacity difference between the abnormal battery cell and the preset normal battery cell after each test cycle, and the pressure difference between the preset normal battery cell and the preset abnormal battery cell.

[0107] Specifically, this step has the same function as step S120 and will not be described in detail here.

[0108] S330, determining an actual capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the preset charge and discharge curve of the normal battery cell and the preset charge and discharge curve of the abnormal battery cell.

[0109] Specifically, this step has the same function as step S130 and will not be described in detail here.

[0110] S340, determining an actual capacity difference-pressure difference curve of a preset abnormal battery cell according to the actual capacity difference of each test cycle and the pressure difference between the preset normal battery cell and the preset abnormal battery cell.

[0111] Specifically, this step has the same function as step S140 and will not be described in detail here.

[0112] S350 , determining the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve.

[0113] Specifically, this step has the same function as step S150, and will not be described in detail here.

[0114] S361, determining a voltage drop-current correspondence between a self-discharge current and a voltage drop of a preset abnormal battery cell per unit time.

[0115] Since the self-discharge current of the preset abnormal cell is determined according to the preset placement time, the capacity of the preset abnormal cell at the initial moment and the capacity of the preset abnormal cell after the preset placement time, that is, the self-discharge current of the preset abnormal cell Is=(C 放置 -C 初始 ) / T, and the voltage drop of the abnormal cell is preset per unit time, that is, K value = (V 放置 -V 初始 ) / T, that is, the self-discharge current of the preset abnormal battery cell and the voltage drop of the preset abnormal battery cell per unit time are in a one-to-one correspondence. Therefore, the voltage drop-current correspondence between the self-discharge current and the voltage drop of the preset abnormal battery cell per unit time can be determined.

[0116] S362, determining the corresponding relationship between the voltage drop of the preset abnormal battery cell per unit time and the pressure difference in the calculated capacity difference-pressure difference relationship curve according to the voltage drop proportional relationship, the corresponding relationship between the self-discharge current and the calculated capacity difference and the calculated capacity difference-pressure difference relationship curve.

[0117] Specifically, since the calculated capacity difference is calculated based on the self-discharge current, the self-discharge current and the calculated capacity difference have a certain corresponding relationship. The self-discharge current and the voltage drop of the preset abnormal battery cell per unit time are in a one-to-one correspondence. Therefore, the corresponding relationship between the voltage drop of the preset abnormal battery cell per unit time and the calculated capacity difference can be determined. Finally, based on the corresponding relationship between the voltage drop of the preset abnormal battery cell per unit time and the calculated capacity difference and the calculated capacity difference-pressure difference relationship curve, the corresponding relationship between the voltage drop of the preset abnormal battery cell per unit time and the pressure difference in the calculated capacity difference-pressure difference relationship curve is determined, so that R&D personnel can determine the battery cell K value that meets the requirements based on the pressure difference requirements of the battery module, and then screen out the battery cells that meet the requirements.

[0118] The battery module pressure difference analysis method designed in the embodiment of the present invention obtains the self-discharge current of the preset abnormal battery cell in the battery module, determines the calculated capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle according to the self-discharge current, determines the calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell according to the calculated capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle, and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell, determines the actual capacity difference between the preset abnormal battery cell and the preset conventional battery cell after each test cycle according to the charge and discharge curve of the preset conventional battery cell and the charge and discharge curve of the preset abnormal battery cell, and determines the preset abnormal battery cell according to the actual capacity difference of each test cycle and the pressure difference between the preset conventional battery cell and the preset abnormal battery cell The actual capacity difference-pressure difference curve is used to determine the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, so as to accurately judge whether the battery module pressure difference is caused by the abnormal voltage drop of the preset abnormal battery cell per unit time. By determining the voltage drop proportional relationship between the self-discharge current and the voltage drop of the preset abnormal battery cell per unit time, according to the voltage drop proportional relationship, the corresponding relationship between the self-discharge current and the calculated capacity and the calculated capacity difference-pressure difference relationship curve, the corresponding relationship between the voltage drop of the preset abnormal battery cell per unit time and the pressure difference in the calculated capacity difference-pressure difference relationship curve is determined, so that the R&D personnel can determine the battery cell K value that meets the requirements according to the pressure difference requirements of the battery module, and then screen out the battery cells that meet the requirements.

[0119] Furthermore, the self-discharge current of the preset abnormal battery cell in the battery module is obtained, including:

[0120] The self-discharge current of the preset abnormal cell in the battery module is determined according to the preset placement time, the capacity of the preset abnormal cell at the initial moment, and the capacity of the preset abnormal cell after being placed for the preset placement time.

[0121] Specifically, the capacity of the preset abnormal cell after being placed for a preset time can be subtracted from the capacity of the preset abnormal cell at the initial time to obtain the capacity difference of the preset abnormal cell. The capacity difference of the preset abnormal cell can be divided by the preset placement time to determine the self-discharge current of the preset abnormal cell in the battery module. For example, if the preset placement time is T and the capacity of the preset abnormal cell at the initial time is C 初始 、The capacity C of the preset abnormal battery after being placed for a preset time 放置 , then the self-discharge current Is of the abnormal cell preset in the battery module is = (C 放置 -C 初始 ) / T, wherein the preset placement time can be set according to actual conditions, and the embodiment of the present invention is not limited to this.

[0122] Furthermore, the abnormal battery cell is preset as the battery cell with the largest voltage drop per unit time in the battery module.

[0123] Specifically, the calculated capacity difference-pressure difference relationship curve and the actual capacity difference-pressure difference curve can be determined based on the preset abnormal battery cell and the preset conventional battery cell, and the cause of the battery module pressure difference can be determined based on the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve. Since the calculated capacity difference between the preset abnormal battery cell with the largest voltage drop per unit time and the preset conventional battery cell in the battery module is the largest, the test results of the preset abnormal battery cell can cover the test results of other abnormal batteries in the battery module, simplifying the test process.

[0124] Figure 4 A schematic diagram of an electronic device that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0125] like Figure 4As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0126] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0127] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a battery module pressure difference analysis method.

[0128] In some embodiments, the battery module pressure difference analysis method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the battery module pressure difference analysis method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the battery module pressure difference analysis method in any other appropriate manner (e.g., by means of firmware).

[0129] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0130] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0131] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0132] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0133] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0134] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0135] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0136] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery module pressure difference analysis method, characterized in that: include: Obtain the self-discharge current of the preset abnormal battery cell in the battery module, and determine the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the self-discharge current; wherein, in the battery module, the voltage difference between the preset abnormal battery cell and the preset normal battery cell is the largest, the preset abnormal battery cell is a battery cell whose voltage drop per unit time is outside the preset range, and the preset normal battery cell is a battery cell whose voltage drop per unit time is within the preset range; Determine a calculated capacity difference-pressure difference relationship curve of the preset abnormal battery cell according to the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle, and the pressure difference between the preset normal battery cell and the preset abnormal battery cell; Determining the actual capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the charge and discharge curve of the preset normal battery cell and the charge and discharge curve of the preset abnormal battery cell; Determine an actual capacity difference-pressure difference curve of the preset abnormal battery cell according to the actual capacity difference of each test cycle and the pressure difference between the preset normal battery cell and the preset abnormal battery cell; The cause of the battery module pressure difference is determined according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve.

2. The battery module pressure difference analysis method according to claim 1, characterized in that: The calculated capacity difference includes a charge calculated capacity difference and a discharge calculated capacity difference; The calculated capacity difference-pressure difference relationship curve includes a charging calculated capacity difference-pressure difference relationship curve and a discharging calculated capacity difference-pressure difference relationship curve; The actual capacity difference includes the actual capacity difference of charging and the actual capacity difference of discharging; The actual capacity difference-pressure difference curve includes a charging actual capacity difference-pressure difference curve and a discharging actual capacity difference-pressure difference curve; Determining the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve includes: Compare the discharge calculated capacity difference-pressure difference curve with the discharge actual capacity difference-pressure difference curve, and compare the charge calculated capacity difference-pressure difference curve with the charge actual capacity difference-pressure difference curve to determine the cause of the battery module pressure difference.

3. The battery module pressure difference analysis method according to claim 2, characterized in that: Determining the actual capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the charge and discharge curve of the preset normal battery cell and the charge and discharge curve of the preset abnormal battery cell includes: Determine the difference in actual discharge capacity between the preset abnormal cell and the preset normal cell after each test cycle according to the discharge curve of the preset abnormal cell and the discharge curve of the preset normal cell; The actual charging capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined according to the charging curve of the preset abnormal battery cell and the charging curve of the preset normal battery cell.

4. The battery module pressure difference analysis method according to claim 1, characterized in that: Obtaining a self-discharge current of a preset abnormal cell in the battery module, and determining a calculated capacity difference between the preset abnormal cell and a preset normal cell after each test cycle according to the self-discharge current, including: Acquire the self-discharge current of the preset abnormal battery cell in the battery module, and determine a first capacity difference between the preset abnormal battery cell and the preset normal battery cell in each test cycle according to the self-discharge current; The calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined according to the sum of the first capacity difference in each test cycle and the first capacity difference in each test cycle before the test cycle.

5. The battery module pressure difference analysis method according to claim 4, characterized in that: Determining a first capacity difference between the preset abnormal battery cell and the preset normal battery cell in each test cycle according to the self-discharge current includes: determining a charge capacity difference based on the self-discharge current and the charge time in each test cycle; Determine a first static capacity difference according to the self-discharge current and a first static time in each test cycle; wherein the first static time is a time interval between the end of the charging test and the start of the discharging test in each test cycle; determining a discharge capacity difference based on the self-discharge current and the discharge time in each test cycle; Determine a second static capacity difference according to the self-discharge current and the second static time in each test cycle; wherein the second static time is the time interval between the end of the discharge test in each test cycle and the start of the charging test in the next test cycle; The first capacity difference is determined based on the charge capacity difference, the first rest capacity difference, the discharge capacity difference, and the second rest capacity difference.

6. The battery module pressure difference analysis method according to claim 5, characterized in that: Determining the calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the sum of the first capacity difference in each test cycle and the first capacity difference in each test cycle before the test cycle, including: Determine the calculated charge capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle according to the charge capacity difference and the first rest capacity difference in each test cycle, and the sum of the charge capacity difference in each test cycle before the test cycle and the sum of the first rest capacity difference in each test cycle; The discharge calculated capacity difference between the preset abnormal battery cell and the preset normal battery cell after each test cycle is determined based on the discharge capacity difference and the second resting capacity difference in each test cycle, as well as the sum of the discharge capacity difference in each test cycle before the test cycle and the sum of the second resting capacity difference in each test cycle; wherein the calculated capacity difference includes the charge calculated capacity difference and the discharge calculated capacity difference.

7. The battery module pressure difference analysis method according to claim 1, characterized in that: Determining the cause of the battery module pressure difference according to the calculated capacity difference-pressure difference curve and the actual capacity difference-pressure difference curve, and then further comprising: Determine a voltage drop ratio relationship between the self-discharge current and the voltage drop of the preset abnormal battery cell per unit time; According to the voltage drop proportional relationship, the corresponding relationship between the self-discharge current and the calculated capacity, and the calculated capacity difference-pressure difference relationship curve, the corresponding relationship between the voltage drop of the preset abnormal battery cell per unit time and the pressure difference in the calculated capacity difference-pressure difference relationship curve is determined.

8. The battery module pressure difference analysis method according to claim 1, characterized in that: Get the self-discharge current of the preset abnormal cells in the battery module, including: The self-discharge current of the preset abnormal cell in the battery module is determined according to the preset placement time, the capacity of the preset abnormal cell at the initial moment, and the capacity of the preset abnormal cell after being placed for the preset placement time.

9. The battery module pressure difference analysis method according to claim 1, characterized in that: The preset abnormal battery cell is the battery cell with the largest voltage drop per unit time in the battery module.

10. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the battery module pressure difference analysis method described in any one of claims 1-9.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the battery module pressure difference analysis method according to any one of claims 1 to 9 when executed.

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