Battery whole pack capacity test method, device and equipment and storage medium

Abstract

The invention relates to the technical field of battery detection. The invention provides a whole battery pack capacity testing method, device and equipment and a storage medium. The method comprises the following steps: acquiring the position of each battery cell in a whole battery pack, the maximum voltage of the whole battery pack at the charging end and the minimum voltage of the whole battery pack at the discharging end; determining the voltage difference of the whole battery pack according to the maximum voltage and the minimum voltage; and determining whether the capacity of the whole battery pack is abnormal or not according to the voltage difference of the whole battery pack and the position of each battery cell. According to the method, the battery cell position, the maximum voltage at the charging end and the minimum voltage at the discharging end are obtained, the voltage difference is calculated, and whether the capacity of the whole battery pack is abnormal or not is judged by combining the battery cell position information, so that potential problems in the whole battery pack can be found in advance, the test efficiency and accuracy are improved, and the test cost is reduced. And the safety and the reliability of the whole battery pack are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and specifically relates to a method, device, equipment and storage medium for testing the capacity of a whole battery pack. Background Art

[0002] With the rapid development of fields such as electric vehicles and energy storage, the whole battery pack, as the core component of electric vehicles and energy storage systems, its performance and safety directly determine the operating efficiency, reliability and service life of the entire system, so it has received extensive attention inside and outside the industry. In the field of electric vehicles, the capacity of the whole battery pack is a key indicator to measure its cruising range and power performance. A higher battery capacity means that the vehicle can travel a longer distance and reduce the number of charging times, thereby improving the user experience.

[0003] Currently, in order to ensure the reliable quality of the whole battery packs flowing into the market, strict capacity tests are carried out before shipment. The aim is to intercept those defective battery packs with performance defects by accurately measuring the charge and discharge capacity of the whole battery pack, and prevent them from entering the subsequent production and use links, so as to ensure the product quality and user safety of the entire industrial chain. However, the traditional capacity test method has the problem of low test efficiency, which prolongs the production cycle of the whole battery pack and increases the production cost and time cost of enterprises. Summary of the Invention

[0004] The present invention provides a method, device, equipment and storage medium for testing the capacity of a whole battery pack to solve the defect of low test efficiency in the prior art.

[0005] The present invention provides a method for testing the capacity of a whole battery pack, including:

[0006] Obtain the position of each battery cell in the whole battery pack, as well as the maximum voltage at the charging end and the minimum voltage at the discharging end of the whole battery pack;

[0007] Determine the pressure difference of the whole battery pack according to the maximum voltage and the minimum voltage;

[0008] Determine whether there is an abnormality in the capacity of the whole battery pack according to the pressure difference of the whole battery pack and the position of each battery cell.

[0009] According to the method for testing the capacity of a whole battery pack provided by the present invention, the determining whether there is an abnormality in the capacity of the whole battery pack according to the pressure difference of the whole battery pack and the position of each battery cell includes:

[0010] Determine the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage according to the position of each battery cell;

[0011] Determine whether the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are the same battery cell; in the case of the same battery cell, determine whether there is an abnormality in the overall battery pack capacity according to the pressure difference.

[0012] According to a method for testing the overall battery pack capacity provided by the present invention, in the case of the same battery cell, determining whether there is an abnormality in the overall battery pack capacity according to the pressure difference includes:

[0013] Determine whether the pressure difference is greater than a first threshold value. If it is greater than the first threshold value, there is an abnormality in the overall battery pack capacity.

[0014] According to a method for testing the overall battery pack capacity provided by the present invention, in the case where the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are not the same battery cell, determine whether the pressure difference is greater than a second threshold value; the second threshold value is greater than the first threshold value;

[0015] In the case of being greater than the second threshold value, there is an abnormality in the overall battery pack capacity.

[0016] According to a method for testing the overall battery pack capacity provided by the present invention, obtaining the maximum voltage at the charging end of the overall battery pack includes:

[0017] Determine whether the SOC value of the overall battery pack reaches 100%. In the case of reaching 100%, obtain the voltages of all battery cells in the overall battery pack;

[0018] Select the maximum voltage from the voltages of all the battery cells as the maximum voltage at the charging end.

[0019] According to a method for testing the overall battery pack capacity provided by the present invention, obtaining the minimum voltage at the discharging end of the overall battery pack includes:

[0020] Determine whether the SOC value of the overall battery pack reaches 0%. In the case of reaching 0%, obtain the voltages of all battery cells in the overall battery pack;

[0021] Select the minimum voltage from the voltages of all the battery cells as the minimum voltage at the discharging end.

[0022] According to a method for testing the overall battery pack capacity provided by the present invention, the first threshold value is comprehensively determined according to the battery type and test conditions.

[0023] According to a method for testing the overall battery pack capacity provided by the present invention, in the case where the pressure difference is greater than the first threshold value, an alarm signal is issued.

[0024] The present invention also provides a battery pack capacity testing device, including: an acquisition unit, configured to acquire the position of each battery cell in the battery pack, as well as the maximum voltage at the charging end and the minimum voltage at the discharging end of the battery pack;

[0025] a determination unit, configured to determine the voltage difference of the battery pack according to the maximum voltage and the minimum voltage;

[0026] The determination unit is further configured to determine whether there is an abnormality in the battery pack capacity according to the voltage difference of the battery pack and the position of each battery cell.

[0027] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the battery pack capacity testing method as described in any one of the above.

[0028] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the battery pack capacity testing method as described in any one of the above.

[0029] The present invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the battery pack capacity testing method as described in any one of the above.

[0030] The battery pack capacity testing method, device, equipment, and storage medium provided by the present invention acquire the battery cell position, the maximum voltage at the charging end, and the minimum voltage at the discharging end, calculate the voltage difference, and then combine the battery cell position information to determine whether there is an abnormality in the battery pack capacity. This method helps to detect potential problems in the battery pack in advance, improve the testing efficiency and accuracy, and ensure the safety and reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flowchart of the battery pack capacity testing method provided by the present invention;

[0032] Figure 2 is a structural block diagram of a battery pack capacity testing device shown in an exemplary embodiment of the present invention;

[0033] Figure 3 is a structural block diagram of a battery pack capacity testing device shown in another exemplary embodiment of the present invention;

[0034] Figure 4 is a structural block diagram of a battery pack capacity testing device shown in still another exemplary embodiment of the present invention;

[0035] Figure 5It is a structural block diagram of a battery pack capacity test device shown in another exemplary embodiment of the present invention;

[0036] Figure 6 It is a schematic structural diagram of the electronic device provided by the present invention. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without any creative efforts shall fall within the protection scope of the present invention.

[0038] The battery pack capacity is one of the important indicators for measuring the performance of the battery pack, and the voltage difference is a key factor affecting the battery pack capacity and life. Currently, capacity charge and discharge tests are carried out before the battery pack is shipped. During the charge and discharge process, the voltage response of the battery cell is strongly related to its internal electrochemical state. When a certain single battery cell experiences capacity decline, its charge and discharge behaviors will exhibit the following characteristics: during the charging stage, due to the reduced capacity, this battery cell is more likely to reach the charging cut-off voltage, such as 3.65V, at the same current, resulting in the early termination of the overall charging; during the discharging stage, due to insufficient available capacity, this battery cell reaches the discharging cut-off voltage, such as 2.5V, earlier at the same current, resulting in the limited discharging capacity of the overall battery pack. This phenomenon is called "high charging and low discharging". If the battery cell with the property of high charging and low discharging is not removed, the actual available capacity of the entire battery pack will be lower than the nominal value, resulting in a significant attenuation of the battery life of the user side.

[0039] During the traditional capacity charge and discharge test, there is no monitoring of the voltage difference between the maximum single battery cell voltage and the minimum single battery cell voltage at the end of charging and discharging, and no control is carried out. When in the complete charge and discharge process, if the high charging and low discharging occur on the same single battery cell in the battery pack, the high charging and low discharging of this single string of battery cells are caused by the low capacity of this battery cell. If it flows into the market, the overall capacity of the vehicle battery is likely to be low. Therefore, the device needs to automatically determine the abnormality to intercept the shipment of such defective battery packs. The traditional capacity test only focuses on the overall capacity, ignores the voltage difference change between single battery cells, cannot comprehensively reflect the true state of the battery cells during the charge and discharge process of the battery pack, and cannot determine whether a single battery cell has a low capacity state, and cannot intercept before the battery pack is shipped, and finally flows into the market for the customers to perceive.

[0040] Figure 1 It is a flow chart of the battery pack capacity test method provided by the present invention, as Figure 1 shown, the method includes:

[0041] Step 101: Obtain the positions of each cell in the entire battery pack, as well as the maximum voltage at the charging end and the minimum voltage at the discharging end of the entire battery pack.

[0042] Specifically, in the entire battery pack, each cell has its specific position. Obtaining the cell position information is crucial for accurately locating specific cells in subsequent analysis, which is essential for judging the overall state of the entire battery pack and the performance of individual cells.

[0043] During the charging process of the entire battery pack, as charging progresses, the voltages of each cell gradually increase. The maximum voltage at the charging end refers to the voltage value of the cell with the highest voltage in the entire battery pack at the end of charging. This data reflects the highest voltage level of the entire battery pack in the charging state. During the discharging process of the entire battery pack, the voltages of each cell gradually decrease. The minimum voltage at the discharging end refers to the voltage value of the cell with the lowest voltage in the entire battery pack at the end of discharging. This data reflects the lowest voltage level of the entire battery pack in the discharging state.

[0044] Step 102: Determine the voltage difference of the entire battery pack based on the maximum voltage and the minimum voltage.

[0045] Specifically, the voltage difference refers to the difference between the maximum voltage and the minimum voltage in the entire battery pack. By calculating the voltage difference, the voltage distribution of the cells in the entire battery pack and the voltage difference degree between cells can be understood. The magnitude of the voltage difference directly affects the performance and safety of the entire battery pack.

[0046] Step 103: Determine whether there is an abnormality in the capacity of the entire battery pack based on the voltage difference of the entire battery pack and the position of each cell.

[0047] Specifically, through voltage difference analysis and cell position positioning, it is possible to comprehensively judge whether there is an abnormality in the capacity of the entire battery pack. If the voltage difference is abnormal and the positions of specific cells are clear, it is very likely that the performance of these cells has declined, resulting in insufficient capacity or unbalanced performance of the entire battery pack.

[0048] The method provided in this application, by obtaining the positions of each cell in the entire battery pack and combining the maximum voltage at the charging end and the minimum voltage at the discharging end, can accurately calculate the voltage difference and locate the cells that may have problems. This precise positioning avoids the blindness that may exist in traditional testing methods, reduces unnecessary testing steps, improves testing efficiency, and thus shortens the production cycle of the entire battery pack.

[0049] Moreover, through voltage difference calculation and analysis, this application can comprehensively reflect the cell state of the entire battery pack during the charging and discharging processes. This comprehensive testing method can more accurately evaluate the performance and safety of the entire battery pack.

[0050] In summary, the method provided by this application reduces the production cost of enterprises and improves the overall quality of the battery pack by reducing unnecessary testing steps and shortening the production cycle.

[0051] Furthermore, the following introduces how to determine whether there is an abnormality in the battery pack capacity based on the pressure difference of the battery pack and the position of each battery cell, specifically including:

[0052] Based on the position of each battery cell, determine the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage; judge whether the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are the same battery cell; in the case of the same battery cell, determine whether there is an abnormality in the battery pack capacity according to the pressure difference.

[0053] Specifically, the embodiment of this application determines the battery cells corresponding to the maximum voltage at the charging end and the minimum voltage at the discharging end according to the position of each battery cell. By knowing which battery cell has the highest voltage during charging, it is judged whether these two battery cells are the same. If the battery cell with the highest voltage during charging and the battery cell with the lowest voltage during discharging are the same, it means that the capacity of this battery cell is low (i.e., a low-capacity battery cell), resulting in easy reaching of a high voltage during the charging process and a rapid drop to a low voltage during the discharging process. And the low capacity of this battery cell means that there is an abnormality in the battery pack capacity.

[0054] The method provided by the present invention can accurately locate the battery cell that may have problems by judging whether the battery cells corresponding to the maximum voltage and the minimum voltage are the same battery cell, so as to more accurately judge whether there is an abnormality in the battery pack capacity.

[0055] Furthermore, in the case where the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are the same battery cell, judge whether the pressure difference is greater than the first threshold. If it is greater than the first threshold, there is an abnormality in the battery pack capacity.

[0056] Specifically, the first threshold is a reasonable value set according to factors such as battery type and test conditions, and is used to judge whether the pressure difference is within an acceptable range. An excessive pressure difference usually means that there are battery cells with unbalanced performance in the battery pack. Especially when the highest charging voltage and the lowest discharging voltage appear on the same battery cell, it is more likely to indicate that there is a low-capacity problem with this battery cell, resulting in insufficient battery pack capacity or unstable performance.

[0057] The method provided by the present invention provides a quantitative standard for judging whether there is an abnormality in the battery pack capacity by setting a specific first threshold. This makes the judgment process more objective and accurate, reducing the influence of subjective factors. In addition, by simply comparing the pressure difference with the first threshold, it is possible to quickly judge whether there is an abnormality in the battery pack capacity, further improving the test efficiency.

[0058] Further, in the case where the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are not the same battery cell, determine whether the voltage difference is greater than a second threshold; the second threshold is greater than the first threshold; in the case where it is greater than the second threshold, there is an abnormality in the overall battery pack capacity.

[0059] Specifically, when the maximum voltage and the minimum voltage appear in different battery cells, this voltage difference may be caused by various factors, including the factor of inconsistent battery cell capacities. By setting a higher second threshold in this application, the voltage differences truly caused by abnormal battery cell capacities can be screened out more strictly, that is: when the voltage difference is greater than the second threshold, the capacities of the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are both abnormal. The lower first threshold is applicable to the case where the maximum and minimum voltages appear in the same battery cell. However, when there are voltage differences between different battery cells, using the same threshold may lead to false alarms.

[0060] The method provided by the present invention further improves the accuracy of the overall battery pack capacity detection by setting a higher second threshold to handle the situation where the maximum voltage and the minimum voltage appear in different battery cells.

[0061] Further, the first threshold provided by this application is determined comprehensively according to the battery type and test conditions.

[0062] Specifically, different types of batteries (such as lithium-ion batteries, lead-acid batteries, etc.) have different electrochemical characteristics and performance parameters. Therefore, when determining the first threshold, the influence of the battery type needs to be considered to ensure that the first threshold matches the actual performance of the battery. In addition, test conditions (such as temperature, humidity, charge and discharge rate, etc.) will also affect the performance of the battery. Under different test conditions, the voltage difference of the battery may be different. Therefore, when determining the first threshold, the influence of the test conditions also needs to be considered to ensure that the first threshold can maintain accuracy and reliability under different test conditions.

[0063] The method provided by this application can improve the accuracy of the test and reduce the possibility of misjudgment or missed judgment by comprehensively considering the battery type and test conditions when determining the first threshold. Moreover, since the first threshold is determined comprehensively according to the battery type and test conditions, the method provided by this application can adapt to different test scenarios and battery types and has a wider applicability.

[0064] In the embodiments of this application, the first threshold is dynamically adjusted according to the combination of the battery type and test conditions (temperature, rate, SOC range). The first threshold is determined according to the following formula:

[0065]

[0066] where, is the nominal voltage difference threshold; is the temperature compensation coefficient, is the magnification correction coefficient, is the SOC weight factor; is the risk multiplication coefficient, is the reference temperature, and T is the current test temperature.

[0067] The nominal differential pressure threshold has different values according to different battery types. For example: when the battery type is lithium iron phosphate type, the nominal differential pressure threshold can be within a set range; when the battery type is ternary type, the nominal differential pressure threshold is within another corresponding set range; when the battery type is lithium titanate, the nominal differential pressure threshold can be within other set ranges.

[0068] Furthermore, the following introduces how to obtain the maximum voltage at the charging end of the battery pack and how to obtain the minimum voltage at the discharging end of the battery pack:

[0069] Among them, obtaining the maximum voltage at the charging end of the battery pack includes: judging whether the SOC value of the battery pack reaches 100%, and if it reaches 100%, obtaining the voltages of all the battery cells in the battery pack; selecting the maximum voltage from the voltages of the battery cells as the maximum voltage at the charging end.

[0070] Obtaining the minimum voltage at the discharging end of the battery pack includes: judging whether the SOC value of the battery pack reaches 0%, and if it reaches 0%, obtaining the voltages of all the battery cells in the battery pack; selecting the minimum voltage from the voltages of the battery cells as the minimum voltage at the discharging end.

[0071] Specifically, the state of charge of the battery (State of Charge, hereinafter referred to as: SOC) represents the percentage of the remaining battery power in its rated capacity. This application first judges whether the SOC value of the battery pack reaches 100%, that is, whether the battery is fully charged. After confirming that the SOC value of the battery pack reaches 100%, then obtain the voltages of all the battery cells in the battery pack, so as to comprehensively understand the voltage distribution of the battery pack in the fully charged state, and thus more accurately judge the maximum voltage at the charging end, providing an important reference index for evaluating whether the capacity of the battery pack is abnormal. Similarly, after the SOC value of the battery pack reaches 0%, it means that the battery is in a fully discharged state. In the embodiments of the present invention, the capacity charge and discharge test adopts constant current charging, and the SOC value is calculated by the ampere-hour integration method + voltage end correction.

[0072] The method provided by the present invention obtains the maximum voltage at the charging end by determining that the SOC value reaches 100%, and obtains the minimum voltage at the discharging end by determining that the SOC value reaches 0%, and uses them respectively as the maximum voltage at the charging end and the minimum voltage at the discharging end, ensuring the accuracy and reliability of the data, thereby further improving the efficiency and accuracy of the battery pack capacity judgment.

[0073] Further, when the pressure difference is greater than the first threshold, an alarm signal is issued.

[0074] The method provided by the present invention performs alarm by judging whether the pressure difference exceeds the first threshold, avoiding the phenomenon of overcharging and over-discharging of the battery. Moreover, through the alarm, abnormal battery packs can be intercepted from being shipped, avoiding the unevenness of the whole pack capacity caused by the low capacity of a single cell, and avoiding the low-capacity cell from being mixed into the whole pack, resulting in the "barrel effect" causing capacity diving. Thus, the cell screening link can be advanced from the test after packaging to before module assembly, reducing the rework cost caused by cell consistency.

[0075] Specifically, the capacity of the battery pack is determined by the cell with the lowest capacity (the short board). The low-capacity cell will cause the whole pack to reach the voltage limit (overcharging / over-discharging) in advance during the charge and discharge process, resulting in capacity diving. If the capacity test is carried out after the whole pack is assembled, if the abnormal capacity of the whole pack is found, the whole pack needs to be disassembled and traced back to the specific cell, resulting in high costs of module disassembly, rework, and re-assembly. However, through the alarm method of the present application, abnormal cells can be known in advance. Therefore, before module assembly, low-capacity cells can be directly screened out through testing, avoiding them from entering the whole pack assembly link. Thus, there is no need to disassemble the module due to the abnormal capacity of the whole pack, reducing the labor, equipment, and time costs.

[0076] Next, the battery pack capacity test device provided by the present invention will be described. The battery pack capacity test device described below can be mutually referred to the battery pack capacity test method described above.

[0077] Figure 2 is a structural block diagram of a battery pack capacity test device shown in an exemplary embodiment of the present invention, as Figure 2 shown, the device includes:

[0078] An acquisition unit 201, configured to acquire the position of each cell in the battery pack, as well as the maximum voltage at the charging end and the minimum voltage at the discharging end of the battery pack;

[0079] A determination unit 202, configured to determine the pressure difference of the battery pack according to the maximum voltage and the minimum voltage;

[0080] The determination unit 202 is further configured to determine whether there is an abnormality in the battery pack capacity according to the pressure difference of the battery pack and the position of each cell.

[0081] The battery pack capacity testing device provided by the present invention obtains the positions of each battery cell in the battery pack through an acquisition unit, calculates the pressure difference of the battery pack through a determination unit, and uses the determination unit to locate the battery cells that may have problems. This device avoids the blindness that may exist in traditional testing devices, improves the testing efficiency, not only shortens the production cycle of the battery pack, but also can more accurately evaluate the performance and safety of the battery pack.

[0082] Figure 3 It is a structural block diagram of a battery pack capacity testing device shown in another exemplary embodiment of the present invention. As Figure 3 shown, the device further includes: a judgment unit 203;

[0083] The determination unit 202 is further configured to determine the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage according to the position of each battery cell;

[0084] The judgment unit 203 is configured to judge whether the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are the same battery cell; according to the judgment result, use the determination unit 202 to determine whether there is an abnormality in the battery pack capacity.

[0085] The device provided by the present invention can accurately locate the battery cells that may have problems by using the judgment unit to judge whether the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are the same battery cell, so as to more accurately judge whether there is an abnormality in the battery pack capacity.

[0086] Based on Figure 3 this, the present invention further provides a battery pack capacity testing device. The judgment unit 203 of this device is further configured to judge whether the pressure difference is greater than a first threshold; the determination unit 202 of this device is further configured to determine whether there is an abnormality in the battery pack capacity according to the judgment result of the judgment unit 203; if it is greater than the first threshold, the determination unit 202 determines that there is an abnormality in the battery pack capacity.

[0087] The device provided by the present invention can quickly judge whether there is an abnormality in the battery pack capacity by using the judgment unit to judge whether the pressure difference is greater than the first threshold and comparing the pressure difference with the first threshold, effectively improving the testing efficiency.

[0088] Figure 4 It is a structural block diagram of a battery pack capacity testing device shown in another exemplary embodiment of the present invention. As Figure 4 shown, the device further includes: a selection unit 204;

[0089] The determination unit 203 is further configured to determine whether the SOC value of the entire battery pack reaches 100% or 0%. When it reaches 100%, the voltage of all the battery cells in the entire battery pack is obtained by the acquisition unit 201.

[0090] The selection unit 204 is configured to select the maximum voltage from the voltages of all the battery cells as the maximum voltage at the charging end; and select the minimum voltage from the voltages of all the battery cells as the minimum voltage at the discharging end.

[0091] The device provided by the present invention determines that the SOC value reaches 100% and 0% through the determination unit, and selects the maximum voltage at the charging end and the minimum voltage at the discharging end by using the selection unit, ensuring the accuracy and reliability of the data, and further improving the efficiency and accuracy of the determination of the capacity of the entire battery pack by the device.

[0092] Figure 5 It is a structural block diagram of a device for testing the capacity of an entire battery pack shown in another exemplary embodiment of the present invention. As Figure 5 shown, the device further includes: an alarm unit 205;

[0093] The alarm unit 205 is configured to determine whether to issue an alarm signal according to the determination result of the determination unit 203. When the determination result of the determination unit is that the pressure difference is greater than the first threshold, an alarm signal is issued through the alarm unit 205.

[0094] The device provided by the present invention alarms when the pressure difference exceeds the first threshold through the alarm unit, avoiding the phenomenon of overcharging and over-discharging of the battery, and effectively improving the integrity and stability of the device.

[0095] Figure 6 Illustrates a schematic diagram of the physical structure of an electronic device. As Figure 6 shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640. Among them, the processor 610, the communication interface 620, and the memory 630 complete mutual communication through the communication bus 640. The processor 610 can call the logical instructions in the memory 630 to execute the method for testing the capacity of the entire battery pack, and the method includes:

[0096] Obtain the position of each battery cell in the entire battery pack, as well as the maximum voltage at the charging end and the minimum voltage at the discharging end of the entire battery pack;

[0097] Determine the pressure difference of the entire battery pack according to the maximum voltage and the minimum voltage;

[0098] Determine whether there is an abnormality in the capacity of the entire battery pack according to the pressure difference of the entire battery pack and the position of each battery cell.

[0099] In addition, when the logical instructions in the above-mentioned memory 630 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods according to the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories, random access memories, magnetic disks, or optical discs that can store program codes.

[0100] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the battery pack capacity test method provided by the above-mentioned various methods. The method includes:

[0101] Obtain the position of each battery cell in the battery pack, as well as the maximum voltage at the charging end and the minimum voltage at the discharging end of the battery pack;

[0102] Determine the voltage difference of the battery pack according to the maximum voltage and the minimum voltage;

[0103] Determine whether there is an abnormality in the battery pack capacity according to the voltage difference of the battery pack and the position of each battery cell.

[0104] On yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the battery pack capacity test method provided by the above-mentioned various methods. The method includes:

[0105] Obtain the position of each battery cell in the battery pack, as well as the maximum voltage at the charging end and the minimum voltage at the discharging end of the battery pack;

[0106] Determine the voltage difference of the battery pack according to the maximum voltage and the minimum voltage;

[0107] Determine whether there is an abnormality in the battery pack capacity according to the voltage difference of the battery pack and the position of each battery cell.

[0108] The device embodiments described above are merely illustrative. 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 to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0109] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack capacity testing method, characterized in that: include: Obtain the position of each cell in the battery pack, as well as the maximum voltage of the battery pack at the end of charging and the minimum voltage of the battery pack at the end of discharging; Determining the voltage difference of the entire battery pack according to the maximum voltage and the minimum voltage; Determine, according to the position of each battery cell, the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage; Determine whether the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are the same battery cell; in the case of the same battery cell, determine whether there is an abnormality in the capacity of the entire battery pack based on the pressure difference.

2. The battery pack capacity testing method according to claim 1, characterized in that: In the case of the same battery cell, determining whether there is an abnormality in the battery pack capacity according to the voltage difference includes: It is determined whether the pressure difference is greater than a first threshold value. If it is greater than the first threshold value, the battery pack capacity is abnormal.

3. The battery pack capacity testing method according to claim 2, characterized in that: In a case where the battery cell corresponding to the maximum voltage and the battery cell corresponding to the minimum voltage are not the same battery cell, determining whether the voltage difference is greater than a second threshold; the second threshold is greater than the first threshold; When the value is greater than the second threshold, the capacity of the entire battery pack is abnormal.

4. The battery pack capacity testing method according to any one of claims 1 to 3, characterized in that: Obtaining the maximum voltage of the entire battery pack at the end of the charge includes: Determine whether the SOC value of the entire battery pack reaches 100%, and if it reaches 100%, obtain the voltage of all cells in the entire battery pack; A maximum voltage is selected from the voltages of all the battery cells as the maximum voltage at the charging terminal.

5. The battery pack capacity testing method according to claim 4, characterized in that: Obtaining the minimum voltage of the entire battery pack at the end of discharge includes: Determine whether the SOC value of the entire battery pack reaches 0%, and if it reaches 0%, obtain the voltage of all cells in the entire battery pack; A minimum voltage is selected from the voltages of all the battery cells as the minimum voltage at the end of discharge.

6. The battery pack capacity testing method according to claim 2, characterized in that: The first threshold is determined comprehensively according to the battery type and the test conditions.

7. The battery pack capacity testing method according to claim 2, characterized in that: When the pressure difference is greater than the first threshold, an alarm signal is issued.

8. A battery pack capacity testing device, characterized in that: include: An acquisition unit, used to acquire the position of each battery cell in the battery pack, as well as the maximum voltage of the battery pack at the end of charging and the minimum voltage of the battery pack at the end of discharging; A determination unit, used to determine the voltage difference of the entire battery pack according to the maximum voltage and the minimum voltage; The determination unit is further used to determine whether there is an abnormality in the capacity of the entire battery pack according to the pressure difference of the entire battery pack and the position of each battery cell.

9. 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 program, the battery whole pack capacity testing method as described in any one of claims 1 to 7 is implemented.

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