Battery pulse power test method, electronic device, and computer-readable storage medium

Abstract

Embodiments of the present application provide a battery pulse power test method, an electronic device and a computer readable storage medium. The battery pulse power test method comprises: obtaining a battery capacity base at any target temperature; obtaining at least one target state of charge based on the battery capacity base at any target temperature; performing a power test operation for any target temperature and for each target state of charge at the target temperature to obtain N1 pulse charging powers, the highest single cell voltage of the battery after charging with any pulse charging power is within the highest cutoff voltage range; and / or to obtain N2 pulse discharging powers, the lowest single cell voltage of the battery after discharging with any pulse discharging power is within the lowest cutoff voltage range. Embodiments of the present application achieve the purpose of shortening the test period, and can efficiently and reasonably test the pulse power of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pulse power testing method, electronic device, and computer-readable storage medium. Background Technology

[0002] Charge and discharge power is one of the important performance indicators of lithium-ion power batteries. However, no standard charge and discharge power test method is clearly defined in various lithium-ion power battery test methods and standards.

[0003] The commonly used method for testing the charge and discharge power of lithium-ion power batteries is to conduct different pulse charge and discharge power tests at the same temperature and within the same SOC (state of charge) range, such as 10-second pulse charging power tests, 30-second pulse charging power tests, 30-second pulse discharging power tests, and 10-second pulse discharging power tests. Because each power point test requires returning to room temperature to adjust the SOC and spending a considerable amount of time settling in an environmental chamber to the target temperature, this method results in a long testing cycle, sometimes taking 1-2 days to test a single power point. If the charge and discharge power test results do not meet the requirements, the test needs to be repeated, further extending the testing cycle. Summary of the Invention

[0004] This application addresses the shortcomings of existing methods by proposing a battery pulse power testing method, electronic device, and computer-readable storage medium to solve the technical problem of long testing cycles in existing battery pulse power testing methods.

[0005] In a first aspect, embodiments of this application provide a battery pulse power testing method, comprising:

[0006] For any given target temperature, obtain the baseline battery capacity at that target temperature;

[0007] For any target temperature, at least one target state of charge is obtained based on the battery capacity at that target temperature;

[0008] For any target temperature, and for each target state of charge at that target temperature, a power test operation is performed. The power test operation includes:

[0009] To adapt the battery temperature to the target temperature, N1 pulse charging powers are obtained, each corresponding to one of N1 charging durations. The highest single-cell voltage of the battery after charging with any pulse power is within the highest cutoff voltage range, where N1 is a positive integer; and / or,

[0010] The battery temperature is adapted to the target temperature to obtain N2 pulse discharge power, each of which corresponds to N2 discharge durations. The lowest single-cell voltage of the battery after discharge using any pulse discharge power is within the lowest cutoff voltage range, and N2 is a positive integer.

[0011] Optionally, for any target temperature, the baseline battery capacity at that target temperature is obtained, including:

[0012] To bring the battery temperature to room temperature;

[0013] Discharge the battery to its lowest single-cell voltage using a constant current;

[0014] To bring the battery temperature to room temperature;

[0015] Charge the battery to its maximum single-cell voltage using a constant current;

[0016] To adapt the battery temperature to the target temperature;

[0017] The discharge capacity of the battery at the target temperature is obtained by discharging it with a constant current.

[0018] Repeat the above operation at least twice to obtain multiple discharge capacities of the battery at the target temperature. Use the average of the multiple discharge capacities as the base of the battery capacity at the target temperature.

[0019] Optionally, before performing the power test operation, the battery pulse power test method further includes:

[0020] To bring the battery temperature to room temperature;

[0021] The battery is charged to its highest single-cell voltage with a constant current, giving the battery its initial state of charge.

[0022] For any target temperature, based on the battery capacity at that target temperature, at least one target state of charge is obtained, including:

[0023] With the battery temperature adapted to the target temperature, the battery is discharged at a constant current to the target capacity in order to adjust the battery's state of charge from the initial state of charge to the target state of charge. The target capacity is the product of the difference between the initial state of charge and the target state of charge and the battery's base capacity at the target temperature. The target state of charge is less than the initial state of charge.

[0024] Optionally, for any target temperature, based on the battery capacity at that target temperature, at least one target state of charge is obtained, further comprising:

[0025] With the battery temperature adapted to room temperature, the battery is discharged at a constant current to a first target capacity in order to adjust the battery's state of charge from the initial state of charge to the first target state of charge; wherein, the first target capacity is the product of the difference between the initial state of charge and the first target state of charge and the battery's base capacity at room temperature, and the first target state of charge is less than the initial state of charge.

[0026] Optionally, a power test operation is performed for any target temperature and for each target state of charge at that target temperature, including:

[0027] Perform power testing on the battery at a first target temperature and a first target state of charge;

[0028] For any target temperature, based on the battery capacity at that target temperature, at least one target state of charge is obtained, further including:

[0029] Based on the battery temperature being adapted to the first target temperature, the battery is discharged at a constant current to a second target capacity to adjust the battery's state of charge from the first target state of charge to the i-th target state of charge; wherein, the second target capacity is the product of the difference between the first target state of charge and the i-th target state of charge and the battery's base capacity at the first target temperature, the i-th target state of charge is less than the first target state of charge, and i is a positive integer equal to or greater than 2;

[0030] For any target temperature, and for each target state of charge at that target temperature, a power test operation is performed, which also includes:

[0031] Perform power testing operations on the battery at a first target temperature and an i-th target state of charge to obtain the pulse charging power and / or pulse discharging power of the battery at the first target temperature and different states of charge.

[0032] Optionally, a power test operation is performed on the battery at a first target temperature and a first target state of charge, including:

[0033] S101. Adapt the battery temperature to the first target temperature and charge the battery with the first preset charging power for a first charging period to obtain the first highest single cell voltage of the battery.

[0034] S102. Determine whether the first highest single-cell voltage of the battery is within the range of the highest cutoff voltage. If yes, the first preset charging power is the first pulse charging power, the first charging period is the first charging duration corresponding to the first pulse charging power, and the step of charging the battery with the n1th preset charging power for the n1st charging period is executed. If no, the magnitude of the first preset charging power is adjusted, and the above S101 and S102 are repeated until the first highest single-cell voltage of the battery is within the range of the highest cutoff voltage.

[0035] S103. Adapt the battery temperature to the first target temperature, and charge the battery with the n1th preset charging power for the n1th charging period to obtain the n1th highest single cell voltage of the battery, where n1 is a positive integer and equal to or greater than 2.

[0036] S104. Determine whether the highest single-cell voltage of the n1th cell is within the maximum cutoff voltage range. If yes, the preset charging power of the n1th cell is the charging power of the n1th pulse, and the charging period of the n1th cell is the charging duration corresponding to the charging power of the n1th pulse. The first pulse charging power and the charging power of the n1th pulse form the N1th pulse charging power. If no, adjust the magnitude of the preset charging power of the n1th cell and repeat the above steps S103 and S104 until the highest single-cell voltage of the n1th cell is within the maximum cutoff voltage range.

[0037] Optionally, the battery temperature is adapted to a first target temperature, and the battery is charged with a first preset charging power for a first charging period to obtain a first cumulative charging capacity and the corresponding first highest single cell voltage of the battery.

[0038] After charging the battery at a first preset charging power for a first charging period, and before determining whether the battery's first highest single-cell voltage is within the highest cutoff voltage range, the power test operation performed on the battery at the first target temperature and the first target state of charge further includes:

[0039] Let it stand for the first preset time;

[0040] The battery temperature is adjusted to the first target temperature, and the battery is discharged with the first preset current to the first accumulated charge capacity, and then left to stand for the second preset time.

[0041] And / or,

[0042] The battery temperature is adapted to the first target temperature, and the battery is charged with the n1st preset charging power for the n1st charging period to obtain the second cumulative charging capacity and the corresponding n1st highest single cell voltage of the battery.

[0043] After charging the battery with the n1st preset charging power for the n1st charging period, and before determining whether the n1st highest single-cell voltage of the battery is within the highest cutoff voltage range, the power test operation performed on the battery at the first target temperature and the first target state of charge further includes:

[0044] Let it stand for the third preset time;

[0045] The battery temperature is adjusted to the first target temperature, and the battery is discharged with the second preset current to the second accumulated charging capacity, and then left to stand for the fourth preset time.

[0046] Optionally, the magnitude of the first preset charging power can be adjusted, including:

[0047] If the first highest single cell voltage of the battery is greater than the highest cutoff voltage range, the first preset charging power is reduced; if the first highest single cell voltage of the battery is less than the highest cutoff voltage range, the first preset charging power is increased.

[0048] And / or,

[0049] Adjusting the magnitude of the n1-th preset charging power includes:

[0050] If the highest voltage of the n1th cell in the battery is greater than the maximum cutoff voltage range, the preset charging power of the n1th cell will be reduced; if the highest voltage of the n1th cell in the battery is less than the maximum cutoff voltage range, the preset charging power of the n1th cell will be increased.

[0051] Optionally, performing a power test on the battery at a first target temperature and a first target state of charge further includes:

[0052] S201. Adapt the battery to a first target temperature and discharge the battery for a first discharge period with a first preset discharge power to obtain the first minimum single cell voltage of the battery.

[0053] S202. Determine whether the first lowest single cell voltage of the battery is within the minimum cutoff voltage range. If yes, the first preset discharge power is the first pulse discharge power, the first discharge period is the first discharge duration corresponding to the first pulse discharge power, and execute the step of discharging the battery with the n2nd preset discharge power for the n2nd discharge period. If no, adjust the magnitude of the first preset discharge power and repeat the above S201 and S202 until the obtained first lowest single cell voltage of the battery is within the minimum cutoff voltage range.

[0054] S203. Adapt the battery to the first target temperature and discharge the battery with the n2th preset discharge power for the n2th discharge period to obtain the n2th lowest single cell voltage of the battery, where n2 is a positive integer and equal to or greater than 2.

[0055] S204. Determine whether the n2nd lowest single cell voltage of the battery is within the minimum cutoff voltage range. If yes, the n2nd preset discharge power is the n2nd pulse discharge power, the n2nd discharge period is the n2nd discharge duration corresponding to the n2nd pulse discharge power, and the first pulse discharge power and the n2nd pulse discharge power form N2 pulse discharge power. If no, adjust the magnitude of the n2nd preset discharge power and repeat the above S203 and S204 until the n2nd lowest single cell voltage of the battery is within the minimum cutoff voltage range.

[0056] Optionally, the battery is adapted to a first target temperature, and the battery is discharged for a first discharge period with a first preset discharge power to obtain a first cumulative discharge capacity and the corresponding first minimum single cell voltage of the battery.

[0057] After discharging the battery at a first preset discharge power for a first discharge period, and before determining whether the battery's first minimum single-cell voltage is within the minimum cutoff voltage range, the power test operation performed on the battery at the first target temperature and the first target state of charge further includes:

[0058] Let it stand for the fifth preset time;

[0059] The battery temperature is adjusted to the first target temperature, and the battery is charged with the first discharge cumulative capacity using the third preset current, and then left to stand for the sixth preset time.

[0060] And / or,

[0061] The battery is adapted to the first target temperature, and the battery is discharged for the n2nd discharge period with the n2nd preset discharge power to obtain the second cumulative discharge capacity and the corresponding n2nd lowest single cell voltage of the battery.

[0062] After discharging the battery at the n2nd preset discharge power for the n2nd discharge period, and before determining whether the n2nd lowest single-cell voltage of the battery is within the lowest cutoff voltage range, the power test operation performed on the battery at the first target temperature and the first target state of charge further includes:

[0063] Let it stand for the seventh preset time;

[0064] The battery temperature is adjusted to the first target temperature, and the battery is charged with the second discharge cumulative capacity using the fourth preset current, and then left to stand for the eighth preset time.

[0065] Optionally, the magnitude of the first preset discharge power is adjusted, including:

[0066] If the first minimum single-cell voltage of the battery is greater than the minimum cutoff voltage range, the first preset discharge power is increased; if the first minimum single-cell voltage of the battery is less than the minimum cutoff voltage range, the first preset discharge power is decreased.

[0067] And / or,

[0068] Adjusting the magnitude of the n2th preset discharge power includes:

[0069] If the lowest single-cell voltage of the n2th cell is greater than the minimum cutoff voltage range, the preset discharge power of the n2th cell will be increased; if the lowest single-cell voltage of the n2th cell is less than the minimum cutoff voltage range, the preset discharge power of the n2th cell will be decreased.

[0070] Optionally, performing a power test operation for any target temperature and for each target state of charge at that target temperature further includes:

[0071] Perform a power test on the battery at the j-th target temperature and the first target state of charge, where j is a positive integer and equal to or greater than 2;

[0072] For any target temperature, based on the battery capacity at that target temperature, at least one target state of charge is obtained, further including:

[0073] Based on the battery temperature being adapted to the j-th target temperature, the battery is discharged at a constant current to a third target capacity to adjust the battery's state of charge from the first target state of charge to the i-th target state of charge; wherein, the third target capacity is the product of the difference between the first target state of charge and the i-th target state of charge and the battery's base capacity at the j-th target temperature, and the i-th target state of charge is less than the first target state of charge.

[0074] For any target temperature, and for each target state of charge at that target temperature, a power test operation is performed, which also includes:

[0075] Perform power testing operations on the battery at the j-th target temperature and the i-th target state of charge to obtain the pulse charging power and / or pulse discharging power of the battery at the j-th target temperature and different states of charge.

[0076] Optionally, the maximum cutoff voltage range is greater than or equal to 4.155V and less than or equal to 4.175V; and / or,

[0077] The minimum cutoff voltage range is greater than or equal to 2.884V and less than or equal to 2.904V.

[0078] Secondly, embodiments of this application provide an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the battery pulse power testing method as described above.

[0079] Thirdly, embodiments of this application provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the battery pulse power testing method described above.

[0080] The beneficial technical effects of the technical solutions provided in this application include:

[0081] In this embodiment, the battery capacity base at any target temperature is obtained. Based on the battery capacity base at any target temperature, the battery can be in multiple different target states of charge at any target temperature. Power testing is performed on the battery for any target temperature and each target state of charge at any target temperature, so that N1 pulse charging power and N2 pulse discharging power can be obtained when the battery temperature is adapted to any target temperature.

[0082] In this embodiment, based on the battery capacity baseline obtained at any target temperature, the state of charge of the battery can be adjusted at any target temperature, allowing the battery to switch between multiple different target states of charge at any target temperature. This enables power testing operations to be performed on the battery at a target temperature and multiple different states of charge at that target temperature, and also allows power testing operations to be performed on the battery at different target temperatures and multiple different states of charge at each target temperature, to obtain N1 pulse charging power and N2 pulse discharging power of the battery at any target temperature and any state of charge.

[0083] This application allows direct adjustment of the battery's state of charge (SOC) at any target temperature, enabling power testing at any target temperature and under any SOC condition. This eliminates the need to return to room temperature for SOC adjustment and to allow time for the battery temperature to recover to the target temperature, thus shortening the testing cycle. Furthermore, if the test results do not meet requirements, the test can be restarted directly at any target temperature without returning to room temperature to begin from scratch, further shortening the testing cycle. The battery pulse power testing method described in this application has a short testing cycle and can efficiently and reasonably test the battery's pulse power.

[0084] Furthermore, in this embodiment, after charging the battery for the corresponding charging time using any one of the N1 pulse charging powers, the highest single-cell voltage of the battery is within the highest cutoff voltage range. After discharging the battery for the corresponding discharging time using any one of the N2 pulse discharging powers, the lowest single-cell voltage of the battery is within the lowest cutoff voltage range, which can avoid overvoltage, undervoltage and other faults in the battery system.

[0085] The battery pulse power testing method in this application has a short testing cycle and takes into account the influence of SOC accuracy, which is close to the actual working conditions. The battery pulse power obtained by using the battery pulse power testing method in this application makes it difficult for the battery system to produce faults such as overvoltage or undervoltage.

[0086] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0087] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0088] Figure 1 A schematic flowchart of a battery pulse power testing method provided in an embodiment of this application;

[0089] Figure 2 This is a schematic flowchart illustrating the power test operation (battery pulse charging power test) performed on a battery at a first target temperature and a first target state of charge in a battery pulse power test method provided in this application embodiment.

[0090] Figure 3 This is another schematic diagram of the process of performing a power test operation (battery pulse discharge power test) on a battery at a first target temperature and a first target state of charge in a battery pulse power test method provided in an embodiment of this application. Detailed Implementation

[0091] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0092] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the word “comprising” as used in the specification of this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by the art. The term “and / or” as used herein refers to at least one of the items defined by the term; for example, “A and / or B” can be implemented as “A,” or as “B,” or as “A and B.”

[0093] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0094] State of charge (SOC): This is the ratio of the remaining capacity of a battery after a period of use or long-term storage to its capacity when fully charged. It is usually expressed as a percentage and its value ranges from 0 to 1. When SOC = 0, it means that the battery is fully discharged, and when SOC = 1, it means that the battery is fully charged.

[0095] The commonly used method for testing the charging and discharging power of lithium-ion power batteries is to conduct different pulse charging and discharging power tests at the same temperature and within the same SOC range, such as 10s pulse charging power test, 30s pulse charging power test, 30s pulse discharging power test, and 10s pulse discharging power test.

[0096] Since each power point test requires returning to room temperature to adjust the SOC and spending a considerable amount of time settling in an environmental chamber to the target temperature, the testing cycle of this method is relatively long. Testing a power point can sometimes take 1 to 2 days. If the charge and discharge power test results do not meet the requirements, the test needs to be repeated, which will make the testing cycle even longer.

[0097] Furthermore, existing technologies do not consider the impact of SOC accuracy or the consistency of battery temperature. Although existing technologies meet the allowable range of the highest and lowest cutoff voltages of the battery system after charging and discharging for a certain period of time, the test results are significantly different from the actual operating conditions under extreme conditions. This can lead to excessive actual power usage and cause overvoltage, undervoltage, and other faults in the battery system.

[0098] Therefore, how to efficiently and reasonably test the pulse power of battery systems has become an important research direction in this field.

[0099] The battery pulse power testing method, electronic device, and computer-readable storage medium provided in this application aim to solve the above-mentioned technical problems of the prior art, so as to efficiently and reasonably test the pulse power of the battery system.

[0100] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.

[0101] Based on the same inventive concept, this application provides a battery pulse power testing method, the flowchart of which is shown below. Figure 1 As shown, the battery pulse power testing method includes:

[0102] S10. For any target temperature, obtain the baseline battery capacity at that target temperature;

[0103] S20. For any target temperature, based on the battery capacity at that target temperature, obtain at least one target state of charge;

[0104] S30. For any target temperature, and for each target state of charge at that target temperature, perform a power test operation, which includes:

[0105] To adapt the battery temperature to the target temperature, N1 pulse charging powers are obtained, each corresponding to one of N1 charging durations. The highest single-cell voltage of the battery after charging with any pulse charging power is within the highest cutoff voltage range, where N1 is a positive integer. Similarly, to adapt the battery temperature to the target temperature, N2 pulse discharging powers are obtained, each corresponding to one of N2 discharging durations. The lowest single-cell voltage of the battery after discharging with any pulse discharging power is within the lowest cutoff voltage range, where N2 is a positive integer.

[0106] In this embodiment, the battery pulse power can be tested using a battery pulse power testing method. Specifically, the battery capacity baseline at any target temperature is obtained. Based on the battery capacity baseline at any target temperature, the battery can be placed in multiple different target states of charge at any target temperature. Power testing is performed on the battery for any target temperature and each target state of charge at that target temperature, enabling the acquisition of N1 pulse charging powers and N2 pulse discharging powers when the battery temperature is adapted to any target temperature. The N1 pulse charging powers correspond one-to-one with N1 charging durations, and all N1 pulse charging powers satisfy the following relationship: after charging the battery with any of the N1 pulse charging powers for the corresponding charging duration, the highest single-cell voltage of the battery is within the highest cutoff voltage range. Similarly, the N2 pulse discharging powers correspond one-to-one with N2 discharging durations, and all N2 pulse discharging powers satisfy the following relationship: after discharging the battery with any of the N2 pulse discharging powers for the corresponding discharging duration, the lowest single-cell voltage of the battery is within the lowest cutoff voltage range.

[0107] In this embodiment, based on the battery capacity baseline obtained at any target temperature, the state of charge of the battery can be adjusted at any target temperature, allowing the battery to switch between multiple different target states of charge at any target temperature. This enables power testing operations to be performed on the battery at a target temperature and multiple different states of charge at that target temperature, and also allows power testing operations to be performed on the battery at different target temperatures and multiple different states of charge at each target temperature, to obtain N1 pulse charging power and N2 pulse discharging power of the battery at any target temperature and any state of charge.

[0108] Compared to technologies that require returning to room temperature to adjust the State of Charge (SOC) for each power point test and spending considerable time resting the battery in an environmental chamber to reach the target temperature, resulting in a long testing cycle, this application allows direct adjustment of the battery's State of Charge (SOC) at any target temperature. This enables power testing of the battery at any target temperature and under any SOC, eliminating the need to return to room temperature to adjust the SOC or spend time allowing the battery temperature to recover from room temperature to the target temperature. This shortens the testing cycle. Furthermore, if the test results do not meet the requirements, the test can be restarted directly at any target temperature without having to return to room temperature to start from scratch, further shortening the testing cycle.

[0109] The battery pulse power testing method of this application has a short testing cycle and can efficiently and reasonably test the pulse power of the battery.

[0110] Furthermore, in this embodiment, when the battery is charged using any one of the N1 pulse charging powers, the highest single-cell voltage of the battery is within the highest cutoff voltage range. When the battery is discharged using any one of the N2 pulse discharging powers, the lowest single-cell voltage of the battery is within the lowest cutoff voltage range, thus avoiding overvoltage, undervoltage, and other faults in the battery system.

[0111] In related technologies, the minimum allowable cutoff voltage of the battery is 2.8V, and the maximum cutoff voltage is 4.3V, with a voltage range of 2.8V to 4.3V. During charging, the system checks whether the real-time acquired maximum battery system voltage exceeds 4.3V; if it does, the battery is in an overvoltage state. During discharging, the system checks whether the real-time acquired minimum battery system voltage is less than 2.8V; if it is less than 2.8V, the battery is in an undervoltage state.

[0112] Considering the impact of SOC accuracy, which mainstream companies can achieve within 3%, the battery voltage range in the application embodiment is optionally adjusted to 2.8×(1+3%)V~4.3 / (1+3%)V, i.e., 2.884V~4.175V. Furthermore, to test the battery's maximum capability, voltage fluctuations of 20mV are allowed at both the upper and lower limits.

[0113] Therefore, optionally, in this embodiment of the application, the lower limit range of the battery voltage, Vlower, is [2.884V, 2.904V], and the lowest cutoff voltage range is greater than or equal to 2.884V and less than or equal to 2.904V; the upper limit range of the battery voltage, Vup, is [4.155V, 4.175V], and the highest cutoff voltage range is greater than or equal to 4.155V and less than or equal to 4.175V. This setting reduces the impact of SOC accuracy, makes the battery testing process closer to actual operating conditions, and avoids making the battery performance overly conservative, while still approaching the battery's maximum capacity as closely as possible.

[0114] The battery pulse power testing method in this application has a short testing cycle and takes into account the influence of SOC accuracy, which is close to the actual working conditions. The battery pulse power obtained by using the battery pulse power testing method in this application makes it difficult for the battery system to produce faults such as overvoltage or undervoltage.

[0115] It should be noted that, in the embodiments of this application, adapting the battery temperature to the target temperature includes: without activating the thermal management system, within a certain period of time (e.g., 1 hour), ensuring that the temperature difference between the internal temperature sampling value of the battery system (i.e., the battery temperature in this document) and the temperature of the test environment is less than or equal to 2°C, wherein the temperature of the test environment is the target temperature.

[0116] Optionally, in this embodiment of the application, obtaining the battery capacity baseline at any target temperature includes:

[0117] The battery temperature is brought to room temperature (25°C). Optionally, without activating the thermal management system, the temperature difference between the battery and the test environment (room temperature) is kept less than or equal to 2°C for a certain period of time (e.g., 1 hour).

[0118] Next, the battery is discharged at a constant current to the minimum single-cell voltage. Optionally, the battery is subjected to a standard discharge at room temperature to bring it to the minimum single-cell voltage. Optionally, a standard discharge means discharging the battery at a constant current (e.g., 1C constant current) to the minimum single-cell voltage (e.g., 2.8V) and then allowing it to stand for 60 minutes.

[0119] Next, the battery temperature is adjusted to room temperature, with the temperature difference between the battery temperature and room temperature being less than or equal to 2°C.

[0120] Next, the battery is charged at a constant current to its maximum individual cell voltage. Alternatively, the battery is standardly charged at room temperature to achieve its maximum individual cell voltage.

[0121] Optionally, standard charging involves first charging the battery with a constant current (e.g., 1C constant current) to the highest single-cell voltage (e.g., 4.15V), then charging with a constant current (e.g., 0.6C constant current) to the second highest single-cell voltage (e.g., 4.2V), then charging with a constant current (e.g., 0.33C constant current) to the third highest single-cell voltage (e.g., 4.29V), and finally charging with a constant current (e.g., 0.1C constant current) to the fourth highest single-cell voltage (e.g., 4.3V), followed by a 60-minute resting period. It should be noted that this standard charging mechanism is consistent with the actual operating conditions of the vehicle and can be adaptively adjusted to match these conditions.

[0122] Next, the battery temperature is adapted to the target temperature (the target temperature is, for example, 10°C), and the temperature difference between the battery temperature and the target temperature is less than or equal to 2°C.

[0123] Next, the battery is discharged at a constant current to obtain its discharge capacity at the target temperature. Optionally, the battery is discharged at a constant current of 1C, and its discharge capacity at the target temperature is recorded.

[0124] Next, repeat the above operation at least twice to obtain multiple discharge capacities of the battery at the target temperature. The average of these multiple discharge capacities is used as the base battery capacity C0 at the target temperature. Obtaining the base battery capacity at any target temperature allows for convenient adjustment of the State of Charge (SOC) during subsequent pulse power testing.

[0125] It should be noted that in the embodiments of this application, the battery capacity base C0 refers to the capacity of the battery when it is fully charged, at which point SOC = 1.

[0126] Optionally, the battery capacity baseline C0 at different temperatures in the battery pulse power test method of this application embodiment is shown in Table 1.

[0127] Table 1

[0128] Battery capacity base C0 58 55 52 48 45

[0129] Optionally, in this embodiment of the application, before performing the power test operation, the battery pulse power test method further includes:

[0130] The battery temperature is adapted to room temperature, and the temperature difference between the battery temperature and room temperature is less than or equal to 2℃.

[0131] Next, the battery is charged with a constant current to its highest single-cell voltage, giving it an initial state of charge (SOC). Alternatively, the battery is subjected to a standard charge at room temperature to bring it to its highest single-cell voltage, resulting in an initial SOC of 1.

[0132] Optionally, in the embodiments of this application, for any target temperature, based on the battery capacity at that target temperature, at least one target state of charge is obtained, including:

[0133] With the battery temperature adapted to room temperature, the battery is discharged at a constant current to a first target capacity in order to adjust the battery's state of charge from the initial state of charge to the first target state of charge; wherein, the first target capacity is the product of the difference between the initial state of charge and the first target state of charge and the battery's base capacity at room temperature, and the first target state of charge is less than the initial state of charge.

[0134] Optionally, in this embodiment, the first target state of charge can be set according to the pulse power test requirements, for example, the first target state of charge is 95%. When the initial state of charge of the battery is 1, the battery is discharged with a constant current (e.g., 1C constant current) at a rate of (initial state of charge - first target state of charge) × the battery capacity base C0 at room temperature, that is, discharged (1-95%) × C0, which can adjust the battery's state of charge from the initial state of charge to the first target state of charge.

[0135] Optionally, as shown in Table 1, in the embodiments of this application, C0 is 58 at room temperature. It should be noted that the base battery capacity C0 is different at different temperatures. Different base battery capacity C0 corresponding to each temperature can be selected according to the different temperatures.

[0136] Optionally, in this embodiment of the application, a power test operation is performed for any target temperature and for each target state of charge at that target temperature, including:

[0137] A power test is performed on the battery at a first target temperature and a first target state of charge. By performing this test, N1 pulse charging powers and N2 pulse discharging powers of the battery at the first target temperature and the first target state of charge can be obtained. After charging with any of the N1 pulse charging powers, the highest single-cell voltage of the battery is within the highest cutoff voltage range. After discharging with any of the N2 pulse discharging powers, the lowest single-cell voltage of the battery is within the lowest cutoff voltage range, which can avoid faults such as overvoltage and undervoltage.

[0138] Optionally, in this embodiment of the application, for any target temperature, based on the battery capacity at that target temperature, at least one target state of charge is obtained, which further includes:

[0139] Based on the battery temperature being adapted to the first target temperature, the battery is discharged at a constant current to a second target capacity to adjust the battery's state of charge from the first target state of charge to the i-th target state of charge; wherein, the second target capacity is the product of the difference between the first target state of charge and the i-th target state of charge and the battery's base capacity at the first target temperature, the i-th target state of charge is less than the first target state of charge, and i is a positive integer equal to or greater than 2.

[0140] This application can directly adjust the state of charge (SOC) of the battery at the first target temperature. After performing power testing on the battery at the first target temperature and the first target SOC, the battery's SOC can be adjusted to the i-th target SOC at the first target temperature by adjusting the battery's SOC. This allows subsequent power testing on the battery at the first target temperature and the i-th target SOC to be performed without having to return to room temperature to adjust the SOC, and without having to spend time allowing the battery temperature to recover from room temperature to the first target temperature, thus shortening the testing cycle.

[0141] Optionally, in this embodiment of the application, performing a power test operation for any target temperature and for each target state of charge at that target temperature further includes:

[0142] A power test operation is performed on the battery at the first target temperature and the i-th target state of charge. By performing this operation, N1 pulse charging power and N2 pulse discharging power of the battery at the first target temperature and the i-th target state of charge can be obtained. After charging with any of the N1 pulse charging power, the highest single cell voltage of the battery is within the highest cutoff voltage range. After discharging with any of the N2 pulse discharging power, the lowest single cell voltage of the battery is within the lowest cutoff voltage range, which can avoid faults such as overvoltage and undervoltage.

[0143] By performing the above-described operation of the battery pulse power testing method of this application, multiple pulse charging powers and multiple pulse discharging powers of the battery at the first target temperature and the first target state of charge, as well as multiple pulse charging powers and multiple pulse discharging powers at the first target temperature and the i-th target state of charge, can be obtained. Thus, the pulse charging power and pulse discharging power of the battery at the first target temperature and different states of charge can be obtained.

[0144] In this embodiment of the application, when testing the pulse power of the battery at the same target temperature and different SOCs, it is not necessary to return from the target temperature to room temperature for adaptation and then adapt to the target temperature again. Even if temperature adaptation is required, it is only based on the target temperature and the temperature effect caused by a small amount of pulse charging and discharging. It can be achieved with a small amount of adaptation time, thereby saving the testing cycle.

[0145] In the battery pulse power testing method of this application embodiment, the pulse power test includes pulse charging power test and pulse discharging power test. The pulse charging power of the battery can be obtained through the pulse charging power test, and the pulse discharging power of the battery can be obtained through the pulse discharging power test.

[0146] This application embodiment uses a first target temperature of 10°C, a first target state of charge of 95%, an i-th target state of charge of 90%, and pulse charging power testing including 10s pulse charging power and 30s pulse charging power, and pulse discharging power testing including 10s pulse discharging power and 30s pulse discharging power as examples to illustrate the battery pulse power testing method.

[0147] It should be noted that the meaning of the 10s pulse discharge power test is to discharge the battery with the pulse discharge power for 10s and detect whether the lowest single cell voltage of the battery after charging is within the lowest cutoff voltage range. If the lowest single cell voltage of the battery is within the lowest cutoff voltage range after discharging the battery with the pulse discharge power for 10s, then the pulse discharge power is the pulse discharge power of the battery obtained by the test in this application, and 10s is the discharge duration corresponding to the pulse discharge power.

[0148] Optionally, the pulse charging power value and pulse discharging power value can be preset in advance before testing.

[0149] Optionally, the 10s pulse discharge power values ​​of the battery at different temperatures and different SOCs in the battery pulse power testing method of this application embodiment are shown in Table 2. As shown in Table 2, when the temperature is 10℃ and the SOC is 95%, the 10s pulse discharge power value is 170KW. This value is used as the preset pulse discharge power value. In this case, the 10s pulse discharge power means that the battery is discharged with a power of 170KW for 10 seconds.

[0150] Table 2

[0151]

[0152] Optionally, such as Figure 2 As shown in the embodiments of this application, the power test operation performed on the battery at a first target temperature and a first target state of charge includes:

[0153] S101. Adapt the battery temperature to a first target temperature, and charge the battery for a first charging period with a first preset charging power (as shown in Table 3, X1) to obtain the first highest single-cell voltage of the battery. Optionally, the first target temperature is 10℃, the first target state of charge is 95%, the first charging period is 10s, and the battery is charged for 10s with the first preset charging power to obtain the first highest single-cell voltage of the battery at 10℃ and 95% state of charge, so as to test the 10s pulse charging power of the battery.

[0154] S102. Determine whether the first highest single-cell voltage of the battery is within the range of the highest cutoff voltage. If yes, the first preset charging power is the first pulse charging power, the first charging period is the first charging duration corresponding to the first pulse charging power, and the step of charging the battery with the n1st preset charging power (as shown by X2 in Table 3) for the n1st charging period is executed. If no, the magnitude of the first preset charging power is adjusted, and the above S101 and S102 are repeated until the first highest single-cell voltage of the battery is within the range of the highest cutoff voltage.

[0155] Optionally, in this embodiment of the application, if the battery is charged for 10 seconds at 10°C and 95% charge with a first preset charging power, and the first highest single-cell voltage of the battery is within the range of the highest cutoff voltage, then the first preset charging power meets the requirements, and the first preset charging power is the 10-second pulse charging power.

[0156] If the first highest single-cell voltage is less than the highest cutoff voltage range, the battery is in an undervoltage state; if the first highest single-cell voltage is greater than the highest cutoff voltage range, the battery is in an overvoltage state. In this embodiment, by adjusting the magnitude of the first preset charging power, the first highest single-cell voltage of the battery is ensured to be within the highest cutoff voltage range, thus avoiding faults such as overvoltage and undervoltage.

[0157] S103. Adjust the battery temperature to a first target temperature and charge the battery for the n1th charging period using the n1th preset charging power to obtain the n1th highest single-cell voltage of the battery, where n1 is a positive integer equal to or greater than 2. Optionally, the n1th charging period is 30s, and the battery is charged for 30s using the n1th preset charging power to obtain the n1th highest single-cell voltage of the battery at 10℃ and 95% state of charge, so as to test the 30s pulse charging power of the battery.

[0158] S104. Determine whether the highest single-cell voltage of the n1th cell is within the maximum cutoff voltage range. If yes, the preset charging power of the n1th cell is the charging power of the n1th pulse, and the charging period of the n1th cell is the charging duration corresponding to the charging power of the n1th pulse. The first pulse charging power and the charging power of the n1th pulse form the N1th pulse charging power. If no, adjust the magnitude of the preset charging power of the n1th cell and repeat the above steps S103 and S104 until the highest single-cell voltage of the n1th cell is within the maximum cutoff voltage range.

[0159] Optionally, in this embodiment of the application, if the battery is charged for 30 seconds at 10°C and 95% charge with the n1st preset charging power, and the n1st highest single cell voltage of the battery is within the range of the highest cutoff voltage, then the n1st preset charging power meets the requirements, and the n1st preset charging power is the 30s pulse charging power.

[0160] If the highest voltage of the n1th cell is less than the maximum cutoff voltage range, the battery is in an undervoltage state; if the highest voltage of the n1th cell is greater than the maximum cutoff voltage range, the battery is in an overvoltage state. In this embodiment, by adjusting the magnitude of the preset charging power of the n1th cell, the highest voltage of the n1th cell is ensured to be within the maximum cutoff voltage range, thus avoiding faults such as overvoltage and undervoltage.

[0161] It should be noted that in this embodiment, the operation processes of steps S103 and S104 are similar to or the same as those of steps S101 and S102, with the difference being: in step S101, the preset charging power is the first preset charging power, and the charging period is the first charging period; in step S102, the judgment object is the first highest single-cell voltage of the battery obtained by executing step S101; while in step S103, the preset charging power is the n1th preset charging power, and the charging period is the n1th charging period; and in step S104, the judgment object is the n1th highest single-cell voltage of the battery obtained by executing step S103. Therefore, steps S101 and S102 can be repeatedly executed for different preset charging powers and corresponding charging periods to test different pulse charging powers of the battery at the first target temperature and the first target state of charge.

[0162] This application uses 10s pulse charging power and 30s pulse charging power as examples for illustration. Of course, in some optional embodiments of this application, one pulse charging power (e.g., 5s pulse charging power), or three (e.g., 10s pulse charging power, 20s pulse charging power, 30s pulse charging power) or even more pulse charging power can be tested. The power testing operation process is the same as above, and will not be repeated here.

[0163] In this embodiment of the application, when testing different pulse charging powers of a battery at the same target temperature and the same SOC, such as testing two different pulse charging power points, only a small amount of adaptation time is required between the different pulse charging power points, thereby saving the testing cycle.

[0164] Optionally, in this embodiment of the application, adapting the battery temperature to a first target temperature includes: without activating the thermal management system, within a first preset time period, ensuring that the temperature difference between the battery temperature and the temperature of the test environment is less than or equal to 2°C, wherein the temperature of the test environment is the first target temperature. For example, when the first target temperature is 10°C, adapting the battery temperature to 10°C means, without activating the thermal management system, within a first preset time period (e.g., 1 hour), ensuring that the temperature difference between the battery temperature and the temperature of the test environment is less than or equal to 2°C, wherein the temperature of the test environment is 10°C; that is, obtaining a temperature difference between the battery temperature and 10°C of less than or equal to 2°C, where the battery temperature is 10°C ± 2°C.

[0165] Optionally, in this embodiment, the battery temperature is adapted to a first target temperature, and the battery is charged for a first charging period with a first preset charging power to obtain a first cumulative charging capacity and the corresponding first highest single-cell voltage of the battery. Optionally, if the battery is charged with the first preset charging power for 10 seconds, the battery capacity will increase slightly, and the increase in battery capacity is the first cumulative charging capacity. The first cumulative charging capacity of the battery and the corresponding first highest single-cell voltage of the battery are recorded.

[0166] Optionally, in this embodiment of the application, after charging the battery with a first preset charging power for a first charging period, and before determining whether the first highest single-cell voltage of the battery is within the range of the highest cutoff voltage, performing a power test operation on the battery at a first target temperature and a first target state of charge further includes:

[0167] Allow the battery to stand for a first preset time. Optionally, after the battery temperature has been adapted to a first target temperature and the battery has been charged for a first charging period with a first preset charging power to obtain a first cumulative charging capacity and the corresponding first highest single-cell voltage of the battery, allow it to stand for 5 minutes.

[0168] Next, the battery temperature is adjusted to the first target temperature, and the battery is discharged at the first preset current to accumulate the first charge capacity, and then left to stand for the second preset time. Optionally, when the battery temperature is adjusted to 10°C, the battery is discharged at the first preset current (e.g., 5A current) to accumulate the first charge capacity, reducing the battery capacity and restoring it to the capacity before charging, ensuring that the battery's state of charge is at the first target state of charge (i.e., 95%), and then left to stand for 5 minutes.

[0169] Optionally, in this embodiment of the application, adjusting the magnitude of the first preset charging power includes:

[0170] If the battery's first highest single-cell voltage is greater than the highest cutoff voltage range, the first preset charging power is reduced, and the battery is charged for the first charging period using the reduced first preset charging power to obtain the battery's first highest single-cell voltage. Then, it is determined whether the newly obtained battery's first highest single-cell voltage is within the highest cutoff voltage range. If it is, S103 is performed; otherwise, the reduced first preset charging power needs to be adjusted again, and S101 and S102 are repeated until the battery's first highest single-cell voltage is within the highest cutoff voltage range. If the battery's first highest single-cell voltage is less than the highest cutoff voltage range, the first preset charging power is increased. The operation of increasing the first preset charging power is similar to or the same as the operation of decreasing the first preset charging power, and will not be described in detail here.

[0171] During the pulse charging power test, if the battery's first highest single-cell voltage is greater than the highest cutoff voltage range, the battery is in an overvoltage state. In this case, the first preset charging power needs to be reduced to ensure that the battery's first highest single-cell voltage is within the highest cutoff voltage range. If the battery's first highest single-cell voltage is less than the highest cutoff voltage range, the battery is in an undervoltage state. In this case, the first preset charging power needs to be increased to ensure that the battery's first highest single-cell voltage is within the highest cutoff voltage range.

[0172] Optionally, in this embodiment, the battery temperature is adapted to a first target temperature, and the battery is charged for an n1-th charging period with an n1-th preset charging power to obtain the second cumulative charging capacity and the corresponding n1-th highest single-cell voltage of the battery. Optionally, the battery is charged for 30 seconds with an n1-th preset charging power, resulting in a slight increase in battery capacity. This increase in battery capacity is the second cumulative charging capacity, and the second cumulative charging capacity and the corresponding n1-th highest single-cell voltage of the battery are recorded.

[0173] Optionally, in this embodiment of the application, after charging the battery with the n1th preset charging power for the n1th charging period, and before determining whether the n1th highest single-cell voltage of the battery is within the range of the highest cutoff voltage, the power test operation of the battery at the first target temperature and the first target state of charge further includes:

[0174] Allow the battery to stand for a third preset time. Optionally, after the battery temperature is adapted to the first target temperature and the battery is charged with the n1st preset charging power for the n1st charging period to obtain the second cumulative charging capacity and the corresponding n1st highest single cell voltage of the battery, allow it to stand for 5 minutes.

[0175] Next, the battery temperature is adjusted to the first target temperature, and the battery is discharged at the second preset current to the second accumulated charging capacity, and then left to stand for the fourth preset time. Optionally, when the battery temperature is adjusted to 10°C, the battery is discharged at the second preset current (e.g., 5A current) to the second accumulated charging capacity, so that the battery capacity is reduced and restored to the capacity before charging, ensuring that the battery's state of charge is at the first target state of charge (i.e., 95%), and then left to stand for 5 minutes.

[0176] Optionally, in this embodiment of the application, adjusting the magnitude of the n1th preset charging power includes:

[0177] If the highest voltage of the n1th cell in the battery is greater than the maximum cutoff voltage range, the preset charging power of the n1th cell will be reduced; if the highest voltage of the n1th cell in the battery is less than the maximum cutoff voltage range, the preset charging power of the n1th cell will be increased, so as to ensure that the highest voltage of the n1th cell in the battery is within the maximum cutoff voltage range.

[0178] Optionally, such as Figure 3 As shown in the embodiments of this application, performing a power test operation on the battery at a first target temperature and a first target state of charge further includes:

[0179] S201. Adapt the battery to a first target temperature and discharge it for a first discharge period at a first preset discharge power (as shown in Table 3, X3) to obtain the first minimum single-cell voltage of the battery. Optionally, the first target temperature is 10°C, the first target state of charge is 95%, the first discharge period is 10 seconds, and the battery is discharged for 10 seconds at the first preset discharge power to obtain the first minimum single-cell voltage of the battery at 10°C and 95% state of charge, so as to test the 10-second pulse discharge power of the battery.

[0180] S202. Determine whether the first lowest single-cell voltage of the battery is within the minimum cutoff voltage range. If yes, the first preset discharge power is the first pulse discharge power, the first discharge period is the first discharge duration corresponding to the first pulse discharge power, and execute the step of discharging the battery with the n2nd preset discharge power for the n2nd discharge period. If no, adjust the magnitude of the first preset discharge power and repeat the above S201 and S202 until the obtained first lowest single-cell voltage of the battery is within the minimum cutoff voltage range.

[0181] Optionally, in this embodiment of the application, if the battery is discharged for 10 seconds at a first preset discharge power at 10°C and 95% charge, and the first minimum single cell voltage of the battery is within the minimum cutoff voltage range, then the first preset discharge power meets the requirements, and the first preset discharge power is the 10-second pulse discharge power.

[0182] If the first minimum single-cell voltage is less than the minimum cutoff voltage range, the battery is in an undervoltage state; if the first minimum single-cell voltage is greater than the minimum cutoff voltage range, the battery is in an overvoltage state. In this embodiment, by adjusting the magnitude of the first preset discharge power, the first minimum single-cell voltage of the battery is ensured to be within the minimum cutoff voltage range, thus avoiding faults such as overvoltage and undervoltage.

[0183] S203. Adapt the battery to the first target temperature, and discharge the battery for the n2nd discharge period with the n2nd preset discharge power (as shown by X4 in Table 3) to obtain the n2nd lowest single-cell voltage of the battery, where n2 is a positive integer and equal to or greater than 2. Optionally, the n2nd discharge period is 30s, and the battery is discharged for 30s with the n2nd preset discharge power to obtain the n2nd lowest single-cell voltage of the battery at 10℃ and 95% charge, so as to test the 30s pulse discharge power of the battery.

[0184] S204. Determine whether the n2nd lowest single cell voltage of the battery is within the minimum cutoff voltage range. If yes, the n2nd preset discharge power is the n2nd pulse discharge power, the n2nd discharge period is the n2nd discharge duration corresponding to the n2nd pulse discharge power, and the first pulse discharge power and the n2nd pulse discharge power form N2 pulse discharge power. If no, adjust the magnitude of the n2nd preset discharge power and repeat the above S203 and S204 until the n2nd lowest single cell voltage of the battery is within the minimum cutoff voltage range.

[0185] Optionally, in this embodiment of the application, if the battery is discharged for 30 seconds at a preset discharge power of n2 at 10°C and 95% charge, and the lowest single cell voltage of the battery is within the lowest cutoff voltage range, then the preset discharge power of n2 meets the requirements, and the preset discharge power of n2 is the 30-second pulse discharge power.

[0186] If the lowest voltage of the n2nd individual cell is less than the minimum cutoff voltage range, the battery is in an undervoltage state; if the lowest voltage of the n2nd individual cell is greater than the minimum cutoff voltage range, the battery is in an overvoltage state. In this embodiment, by adjusting the magnitude of the preset discharge power of the n2nd cell, the lowest voltage of the n2nd individual cell is ensured to be within the minimum cutoff voltage range, thus avoiding faults such as overvoltage and undervoltage.

[0187] It should be noted that in the embodiments of this application, the operation process of steps S203 and S204 is similar to or the same as that of steps S201 and S202. Steps S201 and S202 can be repeatedly executed for different preset discharge powers and corresponding discharge periods to test the different pulse discharge powers of the battery at the first target temperature and the first target state of charge.

[0188] This application uses 10s pulse discharge power and 30s pulse discharge power as examples for illustration. Of course, in some optional embodiments of this application, one pulse discharge power (e.g., 5s pulse discharge power), or three (e.g., 10s pulse discharge power, 20s pulse discharge power, 30s pulse discharge power) or even more pulse discharge powers can be tested. The power test operation process is the same as above, and will not be repeated here.

[0189] In this embodiment of the application, when testing different pulse discharge powers of a battery at the same target temperature and the same SOC, such as testing two different pulse discharge power points, only a small amount of adaptation time is required between the different pulse discharge power points, thereby saving the testing cycle.

[0190] Optionally, in this embodiment, the battery is adapted to a first target temperature, and discharged for a first discharge period with a first preset discharge power to obtain a first cumulative discharge capacity and the corresponding first minimum single-cell voltage of the battery. Optionally, the battery is discharged for 10 seconds with the first preset discharge power, resulting in a slight decrease in battery capacity. This decrease in battery capacity is the first cumulative discharge capacity, and the first cumulative discharge capacity and the corresponding first minimum single-cell voltage of the battery are recorded.

[0191] Optionally, in this embodiment of the application, after discharging the battery with a first preset discharge power for a first discharge period and before determining whether the first minimum single-cell voltage of the battery is within the minimum cutoff voltage range, performing a power test operation on the battery at a first target temperature and a first target state of charge further includes:

[0192] The battery is left to stand for a fifth preset time. Optionally, after the battery has been adapted to the first target temperature and discharged for a first discharge period at a first preset discharge power to obtain the first cumulative discharge capacity and the corresponding first minimum single cell voltage of the battery, it is left to stand for 5 minutes.

[0193] Next, the battery temperature is adjusted to the first target temperature, and the battery is charged with the third preset current to achieve the first cumulative discharge capacity, and then left to stand for the sixth preset time. Optionally, when the battery temperature is adjusted to 10°C, the battery is charged with the third preset current (e.g., 5A current) to achieve the first cumulative discharge capacity, thereby increasing the battery capacity and restoring it to the capacity before charging, ensuring that the battery's state of charge is at the first target state of charge (i.e., 95%), and then left to stand for 5 minutes.

[0194] Optionally, in this embodiment of the application, adjusting the magnitude of the first preset discharge power includes:

[0195] If the first minimum single-cell voltage of the battery is greater than the minimum cutoff voltage range, the first preset discharge power is increased, and the battery is discharged for the first discharge period using the increased first preset discharge power to obtain the first minimum single-cell voltage of the battery. Then, it is determined whether the newly obtained first minimum single-cell voltage of the battery is within the minimum cutoff voltage range. If it is, S203 is performed. If not, the increased first preset discharge power needs to be adjusted again, and S201 and S202 are repeated until the first minimum single-cell voltage of the battery is within the minimum cutoff voltage range. If the first minimum single-cell voltage of the battery is less than the minimum cutoff voltage range, the first preset discharge power is decreased. The operation of the decreased first preset discharge power is similar to or the same as the operation of the increased first preset discharge power, and will not be described in detail here.

[0196] During the pulse discharge power test, if the first minimum single cell voltage of the battery is greater than the minimum cutoff voltage range, the battery is in an overvoltage state. In this case, the first preset discharge power needs to be increased to ensure that the first minimum single cell voltage of the battery is within the minimum cutoff voltage range. If the first minimum single cell voltage of the battery is less than the minimum cutoff voltage range, the battery is in an undervoltage state. In this case, the first preset discharge power needs to be decreased to ensure that the first minimum single cell voltage of the battery is within the minimum cutoff voltage range.

[0197] Optionally, in this embodiment, the battery is adapted to a first target temperature, and discharged for a second period of time with a second preset discharge power to obtain the second cumulative discharge capacity and the corresponding second lowest single-cell voltage of the battery. Optionally, the battery is discharged for 30 seconds with a second preset discharge power, resulting in a slight decrease in battery capacity. This decrease in battery capacity is the second cumulative discharge capacity, and the second cumulative discharge capacity and the corresponding second lowest single-cell voltage of the battery are recorded.

[0198] Optionally, in this embodiment of the application, after discharging the battery with the n2th preset discharge power for the n2th discharge period, and before determining whether the n2th lowest single-cell voltage of the battery is within the lowest cutoff voltage range, the power test operation of the battery at the first target temperature and the first target state of charge further includes:

[0199] Set aside for a seventh preset time. Optionally, after adapting the battery to the first target temperature and discharging the battery at the n2 preset discharge power for the n2nd discharge period to obtain the second cumulative discharge capacity and the corresponding n2nd lowest single cell voltage of the battery, set aside for 5 minutes.

[0200] Next, the battery temperature is adjusted to the first target temperature, and the battery is charged with the second cumulative discharge capacity using the fourth preset current; then it is left to stand for the eighth preset time. Optionally, when the battery temperature is adjusted to 10°C, the battery is charged with the second cumulative discharge capacity using the fourth preset current (e.g., 5A current) to increase the battery capacity and restore it to the capacity before charging, ensuring that the battery's state of charge is at the first target state of charge (i.e., 95%), and then left to stand for 5 minutes.

[0201] Optionally, in this embodiment of the application, adjusting the magnitude of the n2th preset discharge power includes:

[0202] If the lowest single-cell voltage of the n2th cell is greater than the minimum cutoff voltage range, the preset discharge power of the n2th cell will be increased; if the lowest single-cell voltage of the n2th cell is less than the minimum cutoff voltage range, the preset discharge power of the n2th cell will be decreased, so as to ensure that the lowest single-cell voltage of the n2th cell is within the minimum cutoff voltage range.

[0203] In this embodiment of the application, when testing different pulse power of a battery at the same target temperature and the same SOC, such as testing four different pulse power points, only a small amount of adaptation time is required between different pulse charging power points, between different pulse discharging power points, and between pulse charging power points and pulse discharging power points tested consecutively, thereby saving the testing cycle.

[0204] Based on the battery temperature being adapted to a first target temperature, the battery is discharged at a constant current to a second target capacity to adjust the battery's state of charge from the first target state of charge to the i-th target state of charge, including:

[0205] Based on the battery's capacity baseline at the first target temperature, the battery is discharged to a target capacity using a constant current (e.g., 1C current). The target capacity is the product of the difference between the first target state of charge and the i-th target state of charge and the battery's capacity baseline at the first target temperature, in order to adjust the battery's state of charge from the first target state of charge to the i-th target state of charge; wherein the i-th target state of charge is less than the first target state of charge.

[0206] Through the above operations, the State of Charge (SOC) can be conveniently adjusted during subsequent pulse power testing. The battery's SOC at the first target temperature can be adjusted from the first target SOC to the i-th target SOC, facilitating subsequent pulse power testing of the battery at both the first target temperature and the i-th target SOC. This embodiment allows direct adjustment of the battery's SOC at the first target temperature, eliminating the need to return to room temperature for SOC adjustment and the time required for the battery temperature to recover from room temperature to the first target temperature, thus shortening the testing cycle.

[0207] Optionally, in this embodiment of the application, the first target temperature is 10°C, the first target state of charge is 95%, and the i-th target state of charge is 90%. Then, the target capacity for discharging the battery is (95% - 90%) × C0. That is, at 10°C, discharging the battery by 5% C0 can adjust the battery's state of charge from 95% to 90%. Wherein, C0 is the base capacity of the battery at the first target temperature.

[0208] Optionally, in this embodiment, a power test operation is performed on the battery at a first target temperature and an i-th target state of charge (e.g., based on the first target temperature and the i-th target state of charge, steps S101 to S104 and steps S201 to S204 are repeated) to obtain the pulse charging power and pulse discharging power of the battery at the first target temperature and the i-th target state of charge. This allows for the acquisition of the pulse charging power and / or pulse discharging power of the battery at the first target temperature and different states of charge.

[0209] In this embodiment, by adjusting the battery's state of charge (SOC) at a first target temperature (which can be any target temperature), the 10s pulse discharge power, 10s pulse charge power, 30s pulse discharge power, and 30s pulse charge power of the battery at different SOC segments within the first target temperature can be tested, and so on. On one hand, testing the battery's pulse power at the same temperature eliminates the need for adaptation from the target temperature back to room temperature and then back to the target temperature. Even if temperature adaptation is required, it is only due to the slight temperature influence from pulse charging and discharging at the target temperature, which can be achieved with a short adaptation time, thus saving the testing cycle. On the other hand, at the same temperature and the same SOC, four different pulse power points are tested on the battery. Switching between different pulse power points requires only a short adaptation time, thus saving the testing cycle.

[0210] Optionally, in this embodiment of the application, performing a power test operation for any target temperature and for each target state of charge at that target temperature further includes:

[0211] A power test is performed on the battery at the j-th target temperature and the first target state of charge, where j is a positive integer equal to or greater than 2. This operation yields N1 pulse charging powers and N2 pulse discharging powers for the battery at the j-th target temperature and the first target state of charge. After charging with any of the N1 pulse charging powers, the highest single-cell voltage of the battery is within the highest cutoff voltage range. Similarly, after discharging with any of the N2 pulse discharging powers, the lowest single-cell voltage of the battery is within the lowest cutoff voltage range, thus preventing overvoltage and undervoltage faults.

[0212] For any target temperature, based on the battery capacity at that target temperature, at least one target state of charge is obtained, including:

[0213] Based on the battery temperature being adapted to the j-th target temperature, the battery is discharged at a constant current to a third target capacity to adjust the battery's state of charge from the first target state of charge to the i-th target state of charge; wherein, the third target capacity is the product of the difference between the first target state of charge and the i-th target state of charge and the battery's base capacity at the j-th target temperature, and the i-th target state of charge is less than the first target state of charge.

[0214] This application allows direct adjustment of the battery's state of charge (SOC) at the j-th target temperature. After performing power testing on the battery at the j-th target temperature and the first target SOC, the battery's SOC at the j-th target temperature is adjusted to the i-th target SOC. This allows subsequent power testing operations to be performed on the battery at the j-th target temperature and the i-th target SOC without having to return to room temperature to adjust the SOC or spend time restoring the battery temperature from room temperature to the first target temperature, thus shortening the testing cycle.

[0215] Optionally, in this embodiment of the application, performing a power test operation for any target temperature and for each target state of charge at that target temperature further includes:

[0216] Perform a power test on the battery at the j-th target temperature and the i-th target state of charge. By performing this operation, the N1-pulse charging power and N2-pulse discharging power of the battery at the j-th target temperature and the i-th target state of charge can be obtained. After charging with any of the N1-pulse charging power, the highest single-cell voltage of the battery is within the highest cutoff voltage range. After discharging with any of the N2-pulse discharging power, the lowest single-cell voltage of the battery is within the lowest cutoff voltage range, which can avoid faults such as overvoltage and undervoltage.

[0217] By employing the aforementioned operations of the battery pulse power testing method of this application, not only can the pulse charging power and pulse discharging power of the battery at a first target temperature and different states of charge be obtained; but also multiple pulse charging powers and multiple pulse discharging powers of the battery at a j-th target temperature and a first target state of charge, as well as multiple pulse charging powers and multiple pulse discharging powers at a j-th target temperature and an i-th target state of charge, can be obtained. Thus, the pulse charging power and / or pulse discharging power of the battery at different target temperatures and different states of charge can be obtained.

[0218] Optionally, the battery pulse power testing method of this application embodiment can also test the 10s pulse discharge power, 10s pulse charging power, 30s pulse discharge power, and 30s pulse charging power of the battery at different SOC ranges at other temperatures.

[0219] Due to limitations in the placement of temperature sensors, related technologies typically cannot represent the minimum or maximum temperature of the battery system, requiring temperature compensation based on specific operating conditions. In this embodiment, under extreme high and low operating condition simulations and actual external temperature measurements, the maximum temperature compensation is determined to be 5°C. This maximum temperature compensation value can be used to bias the pulse power table recording the battery pulse power obtained from the tests. For example, the 10-second pulse discharge power obtained by the battery in a test environment of 10°C (without considering temperature compensation) is biased by 5°C to account for the temperature compensation factor, thus recording the 10-second pulse discharge power as if it were obtained by the battery in a test environment of 15°C. This process is repeated to approximate actual operating conditions, and the biased pulse power table is used for lookup.

[0220] Optionally, the battery pulse power test method of this application embodiment shows the pulse power tables of the battery at 10°C (without considering temperature compensation) and different SOCs as shown in Table 3. Considering the temperature compensation factor, the pulse power tables are biased as a whole, increasing the overall temperature by 5°C. Therefore, after considering temperature compensation, Table 3 can be used as the pulse power tables of the battery at 15°C (considering temperature compensation) and different SOCs of the battery pulse power test method of this application embodiment.

[0221] Table 3

[0222]

[0223] The battery pulse power testing method in this application has a short testing cycle, takes into account the influence of SOC accuracy, considers the consistency of battery temperature, can compensate for temperature, and closely matches the actual working conditions. The battery pulse power obtained by using the battery pulse power testing method in this application makes it difficult for the battery system to produce faults such as overvoltage or undervoltage.

[0224] The battery pulse power testing method in this application embodiment can be applied to battery systems.

[0225] Based on the same inventive concept, this application provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the battery pulse power testing method described above.

[0226] In this embodiment of the application, the computer program is stored in the memory, and the processor executes the computer program to implement various optional implementations of the battery pulse power testing method provided in this embodiment of the application.

[0227] Those skilled in the art will understand that the electronic devices provided in the embodiments of this application can be specifically designed and manufactured for the desired purpose, or may include known devices in general-purpose computers. These devices have computer programs stored therein that are selectively activated or reconfigured. Such computer programs can be stored in a device (e.g., computer) readable medium or in any type of medium suitable for storing electronic instructions and respectively coupled to a bus.

[0228] It should be noted that since the processor of the electronic device in this application embodiment executes the computer program to implement the battery pulse power testing method of this application embodiment, the electronic device in this application embodiment also has the above-mentioned beneficial effects of the battery pulse power testing method of this application embodiment, which will not be repeated here.

[0229] Alternatively, the memory can be communicatively connected to the processor. For example, it can be connected via a bus.

[0230] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the battery pulse power testing method described above.

[0231] In this application embodiment, when the computer program is executed by the processor, it can implement various optional implementations of the battery pulse power testing method provided in this application embodiment.

[0232] It should be noted that, since the computer-readable storage medium of this application embodiment stores a computer program that can implement the battery pulse power testing method of this application embodiment when executed, the computer-readable storage medium of this application embodiment also has the above-mentioned beneficial effects of the battery pulse power testing method of this application embodiment, which will not be repeated here.

[0233] Based on the same inventive concept, this application provides a computer program product, which includes a computer program that, when executed by a processor, implements the battery pulse power testing method described above.

[0234] The computer program product of this application includes a computer program that, when executed by a processor, can implement various optional implementations of the battery pulse power testing method provided in this application.

[0235] It should be noted that, since the computer program product of this application embodiment includes a computer program that can implement the battery pulse power testing method of this application embodiment when executed, the computer program product of this application embodiment also has the above-mentioned beneficial effects of the battery pulse power testing method of this application embodiment, which will not be repeated here.

[0236] By applying the embodiments of this application, at least the following beneficial effects can be achieved:

[0237] In this embodiment, the battery pulse power can be tested using a battery pulse power testing method. Specifically, the battery capacity baseline at any target temperature is obtained. Based on the battery capacity baseline at any target temperature, the battery can be placed in multiple different target states of charge at any target temperature. Power testing is performed on the battery for any target temperature and each target state of charge at that target temperature, enabling the acquisition of N1 pulse charging powers and N2 pulse discharging powers when the battery temperature is adapted to any target temperature. The N1 pulse charging powers correspond one-to-one with N1 charging durations, and all N1 pulse charging powers satisfy the following relationship: after charging the battery with any of the N1 pulse charging powers for the corresponding charging duration, the highest single-cell voltage of the battery is within the highest cutoff voltage range. Similarly, the N2 pulse discharging powers correspond one-to-one with N2 discharging durations, and all N2 pulse discharging powers satisfy the following relationship: after discharging the battery with any of the N2 pulse discharging powers for the corresponding discharging duration, the lowest single-cell voltage of the battery is within the lowest cutoff voltage range.

[0238] In this embodiment, based on the battery capacity baseline obtained at any target temperature, the state of charge of the battery can be adjusted at any target temperature, allowing the battery to switch between multiple different target states of charge at any target temperature. This enables power testing operations to be performed on the battery at a target temperature and multiple different states of charge at that target temperature, and also allows power testing operations to be performed on the battery at different target temperatures and multiple different states of charge at each target temperature, to obtain N1 pulse charging power and N2 pulse discharging power of the battery at any target temperature and any state of charge.

[0239] Compared to technologies that require returning to room temperature to adjust the State of Charge (SOC) for each power point test and spending considerable time resting the battery in an environmental chamber to reach the target temperature, resulting in a long testing cycle, this application allows direct adjustment of the battery's State of Charge (SOC) at any target temperature. This enables power testing of the battery at any target temperature and under any SOC, eliminating the need to return to room temperature to adjust the SOC or spend time allowing the battery temperature to recover from room temperature to the target temperature. This shortens the testing cycle. Furthermore, if the test results do not meet the requirements, the test can be restarted directly at any target temperature without having to return to room temperature to start from scratch, further shortening the testing cycle.

[0240] In this embodiment, when testing the pulse power of a battery at the same target temperature but different SOCs, it is unnecessary to return from the target temperature to room temperature for adaptation, and then back to the target temperature. Even if temperature adaptation is required, it is only due to the slight temperature effect caused by pulse charging and discharging at the target temperature, which can be achieved with a short adaptation time, thus saving the testing cycle. When testing different pulse powers of a battery at the same target temperature and the same SOC, for example, testing four different pulse power points, only a short adaptation time is needed between different pulse power points, thus saving the testing cycle.

[0241] The battery pulse power testing method of this application has a short testing cycle and can efficiently and reasonably test the pulse power of the battery.

[0242] Furthermore, in this embodiment, when the battery is charged using any one of the N1 pulse charging powers, the highest single-cell voltage of the battery is within the highest cutoff voltage range. When the battery is discharged using any one of the N2 pulse discharging powers, the lowest single-cell voltage of the battery is within the lowest cutoff voltage range, thus avoiding overvoltage, undervoltage, and other faults in the battery system.

[0243] The battery pulse power testing method in this application has a short testing cycle, takes into account the influence of SOC accuracy, considers the consistency of battery temperature, can compensate for temperature, and closely matches the actual working conditions. The battery pulse power obtained by using the battery pulse power testing method in this application makes it difficult for the battery system to produce faults such as overvoltage or undervoltage.

[0244] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0245] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0246] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown sequentially according to the arrows, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of this application, the steps in each process can be executed in other orders as required. Moreover, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages may be executed at the same time or at different times. In scenarios where the execution times are different, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and this application does not limit this.

[0247] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. A method for testing battery pulse power, characterized in that, include: For any target temperature, obtain the battery capacity baseline at that target temperature, where the battery capacity baseline is the capacity of the battery when fully charged; The temperature of the battery is brought to room temperature; the battery is charged with a constant current to the highest single-cell voltage, and the battery has an initial state of charge. For any target temperature, based on the battery capacity at that target temperature, at least one target state of charge is obtained, including: discharging the battery at a constant current to a target capacity, based on the battery temperature being adapted to the target temperature, to adjust the battery's state of charge from the initial state of charge to the target state of charge; wherein, the target capacity is the product of the difference between the initial state of charge and the target state of charge and the battery capacity at the target temperature, and the target state of charge is less than the initial state of charge; For any target temperature, and for each target state of charge at that target temperature, a power test operation is performed, the power test operation including: To adapt the battery temperature to the target temperature, N1 pulse charging powers are obtained, each corresponding to one of N1 charging durations. The highest single-cell voltage of the battery after charging with any pulse power is within the highest cutoff voltage range, where N1 is a positive integer; and / or, The battery temperature is adapted to the target temperature to obtain N2 pulse discharge power, each of which corresponds to N2 discharge durations. The lowest single-cell voltage of the battery after discharge using any pulse discharge power is within the lowest cutoff voltage range, and N2 is a positive integer.

2. The battery pulse power testing method according to claim 1, characterized in that, For any target temperature, obtain the baseline battery capacity at that target temperature, including: To bring the temperature of the battery to room temperature; The battery is discharged to its lowest single-cell voltage using a constant current. To bring the temperature of the battery to room temperature; The battery is charged to its highest single-cell voltage using a constant current; To adapt the temperature of the battery to the target temperature; The discharge capacity of the battery at the target temperature is obtained by discharging it with a constant current. Repeat the above operation at least twice to obtain multiple discharge capacities of the battery at the target temperature, and use the average of the multiple discharge capacities as the base of the battery capacity at the target temperature.

3. The battery pulse power testing method according to any one of claims 1 to 2, characterized in that, For any target temperature, and for each target state of charge at that target temperature, a power test operation is performed, including: A power test operation is performed on the battery at a first target temperature and a first target state of charge; A power test operation is performed on the battery at the first target temperature and the i-th target state of charge to obtain the pulse charging power and / or pulse discharging power of the battery at the first target temperature and different states of charge; wherein the i-th target state of charge is less than the first target state of charge, and i is a positive integer equal to or greater than 2; And / or, A power test operation is performed on the battery at the j-th target temperature and the first target state of charge, where j is a positive integer and equal to or greater than 2; Perform a power test operation on the battery at the j-th target temperature and the i-th target state of charge to obtain the pulse charging power and / or pulse discharging power of the battery at the j-th target temperature and different states of charge, so as to obtain the pulse charging power and / or pulse discharging power of the battery at different target temperatures and different states of charge.

4. The battery pulse power testing method according to claim 3, characterized in that, Performing a power test on the battery at a first target temperature and a first target state of charge includes: S101. Adapt the temperature of the battery to a first target temperature, and charge the battery with a first preset charging power for a first charging period to obtain the first highest single-cell voltage of the battery. S102. Determine whether the first highest single cell voltage of the battery is within the range of the highest cutoff voltage. If yes, then execute the step of charging the battery with the n1th preset charging power for the n1st charging period. If no, then adjust the magnitude of the first preset charging power and repeat the above S101 and S102 until the obtained first highest single cell voltage of the battery is within the range of the highest cutoff voltage. S103. Adapt the temperature of the battery to the first target temperature, and charge the battery with the n1th preset charging power for the n1th charging period to obtain the n1th highest single cell voltage of the battery, where n1 is a positive integer and equal to or greater than 2. S104. Determine whether the n1th highest single cell voltage of the battery is within the highest cutoff voltage range; if yes, the first preset charging power and the n1th preset charging power form the N1 pulse charging power; if no, adjust the magnitude of the n1th preset charging power and repeat S103 and S104 until the n1th highest single cell voltage of the battery is within the highest cutoff voltage range.

5. The battery pulse power testing method according to claim 4, characterized in that, The temperature of the battery is adapted to a first target temperature, and the battery is charged with a first preset charging power for a first charging period to obtain a first cumulative charging capacity and the corresponding first highest single cell voltage of the battery. After charging the battery with a first preset charging power for a first charging period, and before determining whether the first highest single-cell voltage of the battery is within the highest cutoff voltage range, the power test operation performed on the battery at the first target temperature and the first target state of charge further includes: Let it stand for the first preset time; The temperature of the battery is adapted to a first target temperature, and the battery is discharged with a first preset current to a first cumulative charge capacity, and then left to stand for a second preset time. And / or, Adjusting the magnitude of the first preset charging power includes: If the first highest single-cell voltage of the battery is greater than the highest cutoff voltage range, the first preset charging power is reduced; if the first highest single-cell voltage of the battery is less than the highest cutoff voltage range, the first preset charging power is increased.

6. The battery pulse power testing method according to claim 3, characterized in that, Performing a power test on the battery at a first target temperature and a first target state of charge further includes: S201. Adapt the battery to the first target temperature and discharge the battery with a first preset discharge power for a first discharge period to obtain the first minimum single cell voltage of the battery. S202. Determine whether the first lowest single cell voltage of the battery is within the minimum cutoff voltage range; if yes, then execute the step of discharging the battery with the n2th preset discharge power for the n2th discharge period; if no, then adjust the magnitude of the first preset discharge power and repeat the above S201 and S202 until the obtained first lowest single cell voltage of the battery is within the minimum cutoff voltage range. S203. Adapt the battery to the first target temperature, and discharge the battery with the n2th preset discharge power for the n2th discharge period to obtain the n2th lowest single cell voltage of the battery, where n2 is a positive integer and equal to or greater than 2; S204. Determine whether the n2nd lowest single cell voltage of the battery is within the minimum cutoff voltage range; if yes, the first preset discharge power and the n2nd preset discharge power form the N2 pulse discharge power; if no, adjust the magnitude of the n2nd preset discharge power and repeat S203 and S204 until the n2nd lowest single cell voltage of the battery is within the minimum cutoff voltage range.

7. The battery pulse power testing method according to claim 6, characterized in that, The battery is adapted to the first target temperature, and the battery is discharged for a first discharge period with a first preset discharge power to obtain the first cumulative discharge capacity and the corresponding first minimum single cell voltage of the battery. After discharging the battery with a first preset discharge power for a first discharge period, and before determining whether the first minimum single-cell voltage of the battery is within the minimum cutoff voltage range, the power test operation performed on the battery at the first target temperature and the first target state of charge further includes: Let it stand for the fifth preset time; The temperature of the battery is adapted to the first target temperature, and the battery is charged with the first cumulative discharge capacity using the third preset current, and then left to stand for the sixth preset time. And / or, Adjusting the magnitude of the first preset discharge power includes: If the first minimum single-cell voltage of the battery is greater than the minimum cutoff voltage range, the first preset discharge power is increased; if the first minimum single-cell voltage of the battery is less than the minimum cutoff voltage range, the first preset discharge power is decreased.

8. The battery pulse power testing method according to any one of claims 1 to 2, characterized in that, The maximum cutoff voltage range is greater than or equal to 4.155V and less than or equal to 4.175V; and / or, The minimum cutoff voltage range is greater than or equal to 2.884V and less than or equal to 2.904V.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, The processor executes the computer program to implement the battery pulse power testing method as described in any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program thereon, characterized in that, When the computer program is executed by the processor, it implements the battery pulse power testing method as described in any one of claims 1 to 8.

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