Verification method and device of battery power test, vehicle and storage medium

Abstract

The application relates to a battery power test verification method and device, a vehicle and a storage medium, wherein the method comprises the following steps: obtaining the actual maximum discharge power of a battery to be tested in combination with a first real capacity, a first preset standard capacity and a theoretical maximum discharge power; adjusting the state of charge of the battery to be tested to a first target state of charge; continuously discharging the adjusted battery to be tested according to the actual maximum discharge power within a first preset time length; restoring the state of charge of the battery to be tested to the first target state of charge by using the actual maximum discharge power, so as to test the end-of-cycle voltage of the battery to be tested after a preset cycle stop condition is reached, and obtain a discharge power verification result of the battery to be tested based on the end-of-cycle voltage. Therefore, the technical problem that the power performance test method of the battery is difficult to be applied to the continuous pulse power discharge working condition in various scenes in the related art, the accuracy of the test result is low, and there is a certain safety hazard is solved.

Description

Technical Field

[0001] This application relates to the field of vehicle battery safety technology, and in particular to a verification method, apparatus, vehicle, and storage medium for battery power testing. Background Technology

[0002] As one of the important performance indicators of lithium-ion power batteries, charging and discharging power requires more rigorous testing methods for the power testing of the entire battery life cycle.

[0003] In related technologies, power performance testing methods mainly include HPPC method, JEVS method, and national standard method. These methods are all designed for the pulse operating conditions commonly used in electric vehicles. However, they may not be applicable to continuous pulse power charging and discharging conditions at different temperatures and under different states of charge throughout the entire life cycle. This results in the power values ​​obtained from the tests being unreasonable and inaccurate. If applied directly, this may lead to problems in the application throughout the entire life cycle, such as battery overcharging or over-discharging, increasing safety hazards. Therefore, improvements are needed. Summary of the Invention

[0004] This application provides a verification method, apparatus, vehicle, and storage medium for battery power testing, in order to solve the technical problem that in related technologies, battery power performance testing methods are difficult to apply to continuous pulse power discharge conditions in various scenarios, resulting in low accuracy of test results and certain safety hazards.

[0005] The first aspect of this application provides a verification method for battery power testing, applied to discharge power testing. The method includes the following steps: converting the first true capacity of the battery under test, combining the first true capacity, a first preset standard capacity, and the theoretical maximum discharge power to obtain the actual maximum discharge power of the battery under test; adjusting the state of charge (SOC) of the battery under test to a first target SOC using the theoretical maximum discharge power; continuously discharging the adjusted battery under test according to the actual maximum discharge power within a first preset time period, wherein during the continuous discharge, the discharge protection voltage is greater than or equal to a first preset voltage; restoring the SOC of the battery under test to the first target SOC using the actual maximum discharge power, so that after reaching a preset cycle stop condition, the cycle end voltage of the battery under test is tested, and the discharge power verification result of the battery under test is obtained based on the cycle end voltage.

[0006] Optionally, in one embodiment of this application, before obtaining the actual maximum discharge power of the target battery by combining the first actual capacity, the first preset standard capacity, and the theoretical maximum discharge power, the method further includes: calibrating the first preset standard capacity of the target battery based on a first preset ambient temperature; adjusting the state of charge of the target battery to the first target state of charge using a first preset current; discharging the adjusted target battery with multiple sets of preset currents of different intensities to obtain a first voltage-current characteristic curve, wherein, during the discharge process, the discharge voltage is less than or equal to a second preset voltage; fitting the first voltage-current characteristic curve to obtain a first fitting equation; substituting the minimum cutoff voltage into the first fitting equation to obtain the maximum discharge current of the target battery in the corresponding state of charge; and calculating the theoretical maximum discharge power of the target battery based on the minimum cutoff voltage and the maximum discharge current.

[0007] A second aspect of this application provides a verification method for battery power testing, applied to charging power testing. The method includes the following steps: converting the second true capacity of the battery under test, combining the second true capacity, a second preset standard capacity, and a theoretical maximum charging power to obtain the actual maximum charging power of the battery under test; adjusting the state of charge (SOC) of the battery under test to a second target SOC using the theoretical maximum charging power; continuously charging the adjusted battery under test at the actual maximum charging power for a second preset time period, wherein during continuous charging, the charging protection voltage is greater than or equal to a third preset voltage; restoring the SOC of the battery under test to the second target SOC using the actual maximum charging power, and after reaching a preset cycle stop condition, testing the cycle-end voltage of the battery under test, and obtaining the charging power verification result of the battery under test based on the cycle-end voltage.

[0008] Optionally, in one embodiment of this application, before obtaining the actual maximum charging power of the target battery by combining the second actual capacity, the second preset standard capacity, and the theoretical maximum charging power, the method further includes: calibrating the second preset standard capacity of the target battery based on a second preset ambient temperature; adjusting the state of charge of the target battery to the second target state of charge using a second preset current; charging the adjusted target battery with multiple sets of preset currents of different intensities to obtain a second voltage-current characteristic curve, wherein, during the charging process, the charging voltage is less than or equal to a fourth preset voltage; fitting the second voltage-current characteristic curve to obtain a second fitting equation; substituting the highest cutoff voltage into the second fitting equation to obtain the maximum charging current of the target battery in the corresponding state of charge; and calculating the theoretical maximum charging power of the target battery based on the lowest cutoff voltage and the maximum charging current.

[0009] Optionally, in one embodiment of this application, calibrating the second standard capacity of the target battery based on a second preset ambient temperature includes: charging and discharging the target battery multiple times using a preset charging strategy and a preset discharging strategy; collecting the discharge capacity of the target battery each time to calculate the average value of the discharge capacity, and using the average value as the second standard capacity.

[0010] A third aspect of this application provides a verification device for battery power testing, applied to discharge power testing. The device includes: a discharge conversion module for converting a first true capacity of the battery under test, and combining the first true capacity, a first preset standard capacity, and a theoretical maximum discharge power to obtain the actual maximum discharge power of the battery under test; a discharge adjustment module for adjusting the state of charge (SOC) of the battery under test to a first target SOC using the theoretical maximum discharge power; a first discharge module for continuously discharging the adjusted battery under test according to the actual maximum discharge power within a first preset time period, wherein during continuous discharge, the discharge protection voltage is greater than or equal to a first preset voltage; and a discharge verification module for restoring the SOC of the battery under test to the first target SOC using the actual maximum discharge power, so that after reaching a preset cycle stop condition, the cycle-end voltage of the battery under test is tested, and the discharge power verification result of the battery under test is obtained based on the cycle-end voltage.

[0011] Optionally, in one embodiment of this application, the system further includes: a first calibration module, configured to calibrate a first preset standard capacity of the target battery based on a first preset ambient temperature; a first adjustment module, configured to adjust the state of charge of the target battery to the first target state of charge using a first preset current; a second discharge module, configured to discharge the adjusted target battery using multiple preset currents of different intensities to obtain a first voltage-current characteristic curve, wherein, during the discharge process, the discharge voltage is less than or equal to a second preset voltage; a first fitting module, configured to fit the first voltage-current characteristic curve to obtain a first fitting equation; a first calculation module, configured to substitute the minimum cutoff voltage into the first fitting equation to obtain the maximum discharge current of the target battery in the corresponding state of charge; and a second calculation module, configured to calculate the theoretical maximum discharge power of the target battery based on the minimum cutoff voltage and the maximum discharge current.

[0012] A fourth aspect of this application provides a verification device for battery power testing, applied to charging power testing. The device includes: a charging conversion module for converting the second true capacity of the battery under test, and combining the second true capacity, a second preset standard capacity, and a theoretical maximum charging power to obtain the actual maximum charging power of the battery under test; a charging adjustment module for adjusting the state of charge (SOC) of the battery under test to a second target SOC using the theoretical maximum charging power; a first charging module for continuously charging the adjusted battery under test at the actual maximum charging power for a second preset time period, wherein during continuous charging, the charging protection voltage is greater than or equal to a third preset voltage; and a charging verification module for restoring the SOC of the battery under test to the second target SOC using the actual maximum charging power, so that after reaching a preset cycle stop condition, the cycle-end voltage of the battery under test is tested, and the charging power verification result of the battery under test is obtained based on the cycle-end voltage.

[0013] Optionally, in one embodiment of this application, the system further includes: a second calibration module, configured to calibrate the second preset standard capacity of the target battery based on a second preset ambient temperature; a second adjustment module, configured to adjust the state of charge of the target battery to the second target state of charge using a second preset current; a second charging module, configured to charge the adjusted target battery using multiple preset currents of different intensities to obtain a second voltage-current characteristic curve, wherein, during the charging process, the charging voltage is less than or equal to a fourth preset voltage; a second fitting module, configured to fit the second voltage-current characteristic curve to obtain a second fitting equation; a third calculation module, configured to substitute the highest cutoff voltage into the second fitting equation to obtain the maximum charging current of the target battery in the corresponding state of charge; and a fourth calculation module, configured to calculate the theoretical maximum charging power of the target battery based on the lowest cutoff voltage and the maximum charging current.

[0014] Optionally, in one embodiment of this application, the second calibration module includes: a control unit, configured to charge and discharge the target battery multiple times using a preset charging strategy and a preset discharging strategy respectively; and a calculation unit, configured to collect the discharge capacity of the target battery each time, calculate the average value of the discharge capacity, and use the average value as the second standard capacity.

[0015] A fifth aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the battery power testing verification method as described in the above embodiments.

[0016] A sixth aspect of this application provides a computer-readable storage medium storing computer instructions for causing the computer to perform a verification method for battery power testing as described in the above embodiments.

[0017] This application embodiment can, during discharge power verification, obtain the actual maximum discharge power of the battery under test by combining the first actual capacity, the first preset standard capacity, and the theoretical maximum discharge power. The state of charge (SOC) of the battery under test is adjusted using the theoretical maximum discharge power. Within a first preset time period, the adjusted battery under test is continuously discharged at the actual maximum discharge power. The SOC of the battery under test is then restored using the actual maximum discharge power. After reaching a preset cycle-stop condition, the cycle-end voltage of the battery under test is measured, and the discharge power verification result is obtained based on the cycle-end voltage. This improves testing efficiency and the accuracy of test results. Therefore, it solves the technical problem in related technologies where battery power performance testing methods are difficult to apply to continuous pulse power discharge conditions in various scenarios, resulting in low accuracy of test results and potential safety hazards.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] 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:

[0020] Figure 1 This is a flowchart of a verification method for battery power testing provided according to an embodiment of this application;

[0021] Figure 2 This is a flowchart of a battery power testing verification method according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a verification device for battery power testing according to an embodiment of this application;

[0023] Figure 4 This is a flowchart of another verification method for battery power testing provided according to an embodiment of this application;

[0024] Figure 5 This is a flowchart of a verification method for battery power testing according to another embodiment of this application;

[0025] Figure 6 This is a schematic diagram of another verification device for battery power testing provided according to an embodiment of this application;

[0026] Figure 7 This is a structural schematic diagram of a vehicle provided according to an embodiment of this application. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0028] The following description, with reference to the accompanying drawings, illustrates a battery power testing verification method, apparatus, vehicle, and storage medium according to embodiments of this application. Addressing the technical problem mentioned in the background art, where battery power performance testing methods are difficult to apply to continuous pulse power discharge conditions in various scenarios, resulting in low accuracy of test results and potential safety hazards, this application provides a battery power testing verification method. In this method, during discharge power verification, the actual maximum discharge power of the battery under test is obtained by combining a first actual capacity, a first preset standard capacity, and the theoretical maximum discharge power. The state of charge (SOC) of the battery under test is adjusted using the theoretical maximum discharge power. Within a first preset time period, the adjusted battery under test is continuously discharged at the actual maximum discharge power. The SOC of the battery under test is then restored using the actual maximum discharge power. After reaching a preset cycle stop condition, the cycle-end voltage of the battery under test is tested, and the discharge power verification result is obtained based on the cycle-end voltage, thereby improving testing efficiency and the accuracy of test results. This solves the technical problem in the related art where battery power performance testing methods are difficult to apply to continuous pulse power discharge conditions in various scenarios, resulting in low accuracy of test results and potential safety hazards.

[0029] Specifically, Figure 1 This is a schematic flowchart illustrating a verification method for battery power testing provided in an embodiment of this application.

[0030] like Figure 1 As shown, this battery power testing verification method is applied to discharge power testing, and the method includes the following steps:

[0031] In step S101, the first true capacity of the battery under test is converted, and the actual maximum discharge power of the battery under test is obtained by combining the first true capacity, the first preset standard capacity and the theoretical maximum discharge power.

[0032] In actual implementation, the embodiments of this application can take the battery with the end of its life cycle as the battery to be tested, and convert it through the first real capacity C1 of the off-line battery. Combine the first real capacity C1, the first preset standard capacity C0 and the theoretical maximum discharge power P1 to obtain the actual maximum discharge power P2 of the battery to be tested, wherein the actual maximum discharge power P2 = P1 × C1 / C0.

[0033] Optionally, in one embodiment of this application, before obtaining the actual maximum discharge power of the target battery by combining the first actual capacity, the first preset standard capacity, and the theoretical maximum discharge power, the method further includes: calibrating the first preset standard capacity of the target battery based on a first preset ambient temperature; adjusting the state of charge of the target battery to a first target state of charge using a first preset current; discharging the adjusted target battery with multiple sets of preset currents of different intensities to obtain a first voltage-current characteristic curve, wherein, during the discharge process, the discharge voltage is less than or equal to a second preset voltage; fitting the first voltage-current characteristic curve to obtain a first fitting equation; substituting the minimum cutoff voltage into the first fitting equation to obtain the maximum discharge current of the target battery in the corresponding state of charge; and calculating the theoretical maximum discharge power of the target battery based on the minimum cutoff voltage and the maximum discharge current.

[0034] Here, we will explain the practical method for obtaining the theoretical maximum discharge power.

[0035] In this embodiment of the application, a fresh battery of the same model and specification as the battery to be tested can be used as the target battery at a first preset ambient temperature T1, and the standard capacity of the target battery can be calibrated to obtain a first preset standard capacity C0.

[0036] The target battery state of charge is adjusted to a preset value, i.e., the first target state of charge SOC1, using the first preset current I1.

[0037] For the target battery with the first target state of charge (SOC1), different preset currents I are applied. n Constant current and constant voltage discharge are performed using the same preset time t1, wherein the discharge voltage is less than or equal to the second preset voltage. The second preset voltage can be set by those skilled in the art according to the actual situation, and no specific restrictions are imposed here.

[0038] Determine the relationship between the voltage at the end of time t1 and the corresponding pulse current, i.e., the response of the first voltage-current curve;

[0039] By fitting the first voltage-current characteristic curve obtained from the test and substituting the lowest cutoff voltage into the fitting equation, the maximum discharge current I under that SOC can be obtained. dis.max And calculate the theoretical maximum discharge power P1 of the target battery;

[0040] Theoretical maximum discharge power P1 = V dis.cutoff ×I dis.max In the formula, V dis.cutoff This is the minimum discharge cutoff voltage.

[0041] In step S102, the state of charge of the battery under test is adjusted to the first target state of charge using the theoretical maximum discharge power.

[0042] Furthermore, in this embodiment of the application, the state of charge of the battery under test can be adjusted to the first target state of charge SOC1 using the theoretical maximum discharge power P1.

[0043] In step S103, within a first preset time period, the adjusted battery to be tested is continuously discharged according to the actual maximum discharge power, wherein during the continuous discharge process, the discharge protection voltage is greater than or equal to the first preset voltage.

[0044] In this embodiment, the battery under test with a first target state of charge (SOC1) can be discharged at a constant power of the actual maximum discharge power P2 for a first preset time t2. During the continuous discharge process, the discharge protection voltage is greater than or equal to the first preset voltage. The first preset voltage can be set by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0045] In step S104, the state of charge of the battery under test is restored to the first target state of charge using the actual maximum discharge power. After the preset cycle stop condition is reached, the cycle end voltage of the battery under test is tested, and the discharge power verification result of the battery under test is obtained based on the cycle end voltage.

[0046] In actual implementation, the embodiments of this application can use the actual maximum discharge power P2 to adjust the state of charge of the battery under test, so that the state of charge of the battery under test is restored to the first target state of charge SOC1.

[0047] According to the performance requirements of the battery cell, the above steps can be repeated 500 to 12000 times in this embodiment. The test data is analyzed. If the voltage at the end of the cycle does not reach the first preset voltage and the internal resistance of the battery cell is normal, it indicates that the power is reasonable and accurate.

[0048] Combination Figure 2 As shown, the working principle of the battery power testing verification method of this application embodiment is illustrated by an example.

[0049] like Figure 2 As shown, embodiments of this application may include the following steps:

[0050] Step S201: At a first preset ambient temperature, the standard capacity of the target battery is calibrated to obtain a first preset standard capacity. In this embodiment of the application, a fresh battery of the same model and specifications as the battery to be tested can be used as the target battery at a first preset ambient temperature T1, and the standard capacity of the target battery can be calibrated to obtain a first preset standard capacity C0.

[0051] Step S202: Adjust the state of charge of the target battery to a first target state of charge using a first preset current. In this embodiment, the first preset current I1 can be used to adjust the state of charge of the target battery to a preset value, namely the first target state of charge SOC1.

[0052] Step S203: Perform constant current and constant voltage discharge on the target battery with the first target state of charge (SOC1) at the same time using preset currents of different intensities, wherein the discharge voltage is less than or equal to a second preset voltage. Perform constant current and constant voltage discharge on the target battery with the first target state of charge (SOC1) using different preset currents I... n Constant current and constant voltage discharge are performed for the same preset time t1, wherein the discharge voltage is less than or equal to the second preset voltage.

[0053] Step S204: Fit the first voltage-current characteristic curve obtained from the test, substitute the highest cutoff voltage into the fitting equation to obtain the corresponding maximum discharge current, and calculate the theoretical maximum discharge power. This embodiment of the application can determine the relationship between the voltage at the end of time t1 and the corresponding pulse current, i.e., the response of the first voltage-current curve; by fitting the first voltage-current characteristic curve obtained from the test and substituting the lowest cutoff voltage into the fitting equation, the maximum discharge current I under that SOC can be obtained. dis.max And calculate the theoretical maximum discharge power P1 of the target battery;

[0054] Theoretical maximum discharge power P1 = V dis.cutoff ×I dis.max In the formula, V dis.cutoff This is the minimum discharge cutoff voltage.

[0055] Step S205: Perform final power verification of the actual maximum discharge power of the battery under test.

[0056] Step S206: Convert the first true capacity of the battery under test to obtain the actual maximum discharge power of the battery under test. In this embodiment of the application, a battery with a cell at the end of its life cycle can be used as the battery under test. The first true capacity C1 of the cell is converted, and the actual maximum discharge power P2 of the battery under test is obtained by combining the first true capacity C1, the first preset standard capacity C0, and the theoretical maximum discharge power P1. Wherein, the actual maximum discharge power P2 = P1 × C1 / C0.

[0057] Step S207: Adjust the state of charge (SOC) of the battery under test to the first target SOC using the theoretical maximum discharge power. In this embodiment, the theoretical maximum discharge power P1 can be used to adjust the SOC of the battery under test to the first target SOC1.

[0058] Step S208: Within a first preset time period, the adjusted test battery is continuously discharged at its actual maximum discharge power, wherein during the continuous discharge process, the discharge protection voltage is greater than or equal to the first preset voltage. This embodiment of the application can discharge the test battery with a first target state of charge (SOC1) at a constant power of its actual maximum discharge power P2 to a first preset time period t2, wherein during the continuous discharge process, the discharge protection voltage is greater than or equal to the first preset voltage.

[0059] Step S209: Use the actual maximum discharge power to restore the state of charge (SOC) of the battery under test to the first target SOC. In this embodiment, the actual maximum discharge power P2 can be used to adjust the SOC of the battery under test, so that the SOC of the battery under test is restored to the first target SOC1.

[0060] Step S210: Repeat the above steps 500 to 12000 times and analyze the test data. If the voltage at the end of the cycle does not reach the first preset voltage, it indicates that the power is reasonable and accurate.

[0061] The battery power testing verification method proposed in this application can, during discharge power verification, obtain the actual maximum discharge power of the battery under test by combining the first actual capacity, the first preset standard capacity, and the theoretical maximum discharge power. The state of charge (SOC) of the battery under test is adjusted using the theoretical maximum discharge power. Within a first preset time period, the adjusted battery under test is continuously discharged at the actual maximum discharge power. The SOC of the battery under test is then restored using the actual maximum discharge power. After reaching a preset cycle-stop condition, the cycle-end voltage of the battery under test is tested, and the discharge power verification result is obtained based on the cycle-end voltage. This improves testing efficiency and the accuracy of test results. Therefore, it solves the technical problem in related technologies where battery power performance testing methods are difficult to apply to continuous pulse power discharge conditions in various scenarios, resulting in low accuracy of test results and potential safety hazards.

[0062] Next, with reference to the accompanying drawings, a verification apparatus for battery power testing according to an embodiment of this application is described.

[0063] Figure 3 This is a block diagram of a verification device for battery power testing according to an embodiment of this application.

[0064] like Figure 3As shown, the battery power testing verification device 10 is used for discharge power testing. The device 10 includes: a discharge conversion module 101, a discharge adjustment module 102, a first discharge module 103, and a discharge verification module 104.

[0065] Specifically, the discharge conversion module 101 is used to convert the first true capacity of the battery under test, and combine the first true capacity, the first preset standard capacity and the theoretical maximum discharge power to obtain the actual maximum discharge power of the battery under test.

[0066] The discharge adjustment module 102 is used to adjust the state of charge of the battery under test to the first target state of charge using the theoretical maximum discharge power.

[0067] The first discharge module 103 is used to continuously discharge the adjusted battery under test according to the actual maximum discharge power within a first preset time period, wherein the discharge protection voltage is greater than or equal to the first preset voltage during the continuous discharge process.

[0068] The discharge verification module 104 is used to restore the state of charge of the battery under test to the first target state of charge using the actual maximum discharge power, so as to test the cycle end voltage of the battery under test after reaching the preset cycle stop condition, and obtain the discharge power verification result of the battery under test based on the cycle end voltage.

[0069] Optionally, in one embodiment of this application, the battery power testing verification device 10 further includes: a first calibration module, a first adjustment module, a second discharge module, a first fitting module, a first calculation module, and a second calculation module.

[0070] The first calibration module is used to calibrate the first preset standard capacity of the target battery based on the first preset ambient temperature.

[0071] The first adjustment module is used to adjust the state of charge of the target battery to the first target state of charge using a first preset current.

[0072] The second discharge module is used to discharge the adjusted target battery using multiple preset currents of different intensities to obtain a first voltage-current characteristic curve, wherein the discharge voltage is less than or equal to the second preset voltage during the discharge process.

[0073] The first fitting module is used to fit the first voltage-current characteristic curve to obtain the first fitting equation.

[0074] The first calculation module is used to input the minimum cutoff voltage into the first fitting equation to obtain the maximum discharge current of the target battery under the corresponding state of charge.

[0075] The second calculation module is used to calculate the theoretical maximum discharge power of the target battery based on the minimum cutoff voltage and the maximum discharge current.

[0076] It should be noted that the explanation of the aforementioned verification method embodiment for battery power testing also applies to the verification device for battery power testing in this embodiment, and will not be repeated here.

[0077] The battery power testing verification device proposed in this application can, during discharge power verification, obtain the actual maximum discharge power of the battery under test by combining the first actual capacity, the first preset standard capacity, and the theoretical maximum discharge power. The state of charge (SOC) of the battery under test is adjusted using the theoretical maximum discharge power. Within a first preset time period, the adjusted battery under test is continuously discharged at the actual maximum discharge power. The SOC of the battery under test is then restored using the actual maximum discharge power. After reaching a preset cycle stop condition, the cycle-end voltage of the battery under test is tested, and the discharge power verification result is obtained based on the cycle-end voltage. This improves testing efficiency and the accuracy of test results. Therefore, it solves the technical problem in related technologies where battery power performance testing methods are difficult to apply to continuous pulse power discharge conditions in various scenarios, resulting in low accuracy of test results and potential safety hazards.

[0078] The above describes the battery power testing verification method of this application embodiment for verifying discharge power during the discharge stage. The following describes the battery power testing verification method of this application embodiment for verifying charging power during the charging stage.

[0079] Specifically, Figure 4 This is a schematic flowchart illustrating another verification method for battery power testing provided in an embodiment of this application.

[0080] like Figure 4 As shown, this battery power testing verification method is applied to charging power testing, and the method includes the following steps:

[0081] In step S401, the second true capacity of the battery under test is converted, and the actual maximum charging power of the battery under test is obtained by combining the second true capacity, the second preset standard capacity and the theoretical maximum charging power.

[0082] In actual implementation, the embodiments of this application can take the battery cell at the end of its life as the battery to be tested, and convert it through the second real capacity C3 of the off-line cell. Combine the second real capacity C3, the second preset standard capacity C2 and the theoretical maximum charging power P3 to obtain the actual maximum charging power P4 of the battery to be tested, wherein the actual maximum charging power P4 = P3 × C3 / C2.

[0083] Optionally, in one embodiment of this application, before obtaining the actual maximum charging power of the target battery by combining the second true capacity, the second preset standard capacity, and the theoretical maximum charging power, the method further includes: calibrating the second preset standard capacity of the target battery based on the second preset ambient temperature; adjusting the state of charge of the target battery to the second target state of charge using a second preset current; charging the adjusted target battery with multiple sets of preset currents of different intensities to obtain a second voltage-current characteristic curve, wherein, during the charging process, the charging voltage is less than or equal to a fourth preset voltage; fitting the second voltage-current characteristic curve to obtain a second fitting equation; substituting the highest cutoff voltage into the second fitting equation to obtain the maximum charging current of the target battery in the corresponding state of charge; and calculating the theoretical maximum charging power of the target battery based on the lowest cutoff voltage and the maximum charging current.

[0084] Here, we will explain the practical method for obtaining the theoretical maximum charging power.

[0085] In this embodiment of the application, a fresh battery of the same model and specification as the battery to be tested can be used as the target battery at a second preset ambient temperature T2, and the standard capacity of the target battery can be calibrated to obtain a second preset standard capacity C2.

[0086] The target battery state of charge is adjusted to the second target state of charge SOC2 using the second preset current I2.

[0087] The target battery with the second target state of charge (SOC2) is subjected to different preset currents I. n Constant current and constant voltage charging is performed using the same preset time t3. During the charging process, the charging voltage is less than or equal to the fourth preset voltage. The fourth preset voltage can be set by those skilled in the art according to the actual situation, and no specific restrictions are imposed here.

[0088] Determine the relationship between the voltage at the end of time t3 and the corresponding pulse current, i.e., the response of the second voltage-current curve;

[0089] By fitting the second voltage-current characteristic curve obtained from the test and substituting the highest cutoff voltage into the fitting equation, the maximum charging current I under this SOC can be obtained. chamax And calculate the theoretical maximum charging power P3 of the target battery;

[0090] Theoretical maximum charging power P3 = V cha.max ×I cha.max , where V cha.max This is the highest charging cutoff voltage.

[0091] Optionally, in one embodiment of this application, the second standard capacity of the target battery is calibrated based on the second preset ambient temperature, including: charging and discharging the target battery multiple times using a preset charging strategy and a preset discharging strategy respectively; collecting the discharge capacity of the target battery each time to obtain the average value of the discharge capacity, and using the average value as the second standard capacity.

[0092] In some embodiments, the target battery can be charged at a constant voltage and constant current rate of 1 / 3C until the target battery reaches a fourth preset voltage, and then charged at a constant voltage until the charging rate drops to 0.05C.

[0093] The target battery is discharged at a constant current rate of 1 / 3C until the voltage of the target battery drops to a third preset voltage. The third preset voltage can be set by those skilled in the art according to the actual situation, and no specific restrictions are imposed here.

[0094] Repeat the above steps three times, and use the average of the three discharge capacities as the second standard capacity.

[0095] It should be noted that the calibration of the first standard capacity can also be achieved in the same way as described above.

[0096] In step S402, the state of charge of the battery under test is adjusted to the second target state of charge using the theoretical maximum charging power.

[0097] Furthermore, in this embodiment of the application, the theoretical maximum charging power P3 can be used to adjust the state of charge of the battery under test to the second target state of charge SOC2.

[0098] In step S403, within a second preset time period, the adjusted battery under test is continuously charged according to the actual maximum charging power, wherein during the continuous charging process, the charging protection voltage is greater than or equal to a third preset voltage.

[0099] In this embodiment, the battery under test with the second target state of charge (SOC2) can be charged at a constant power of the actual maximum charging power P4 to a preset time t3. During the continuous charging process, the charging protection voltage is greater than or equal to a third preset voltage.

[0100] In step S404, the state of charge of the battery under test is restored to the second target state of charge using the actual maximum charging power. After the preset cycle stop condition is reached, the cycle end voltage of the battery under test is tested, and the charging power verification result of the battery under test is obtained based on the cycle end voltage.

[0101] In actual implementation, the embodiments of this application can use the actual maximum charging power P4 to adjust the state of charge, so that the state of charge of the battery under test is restored to the second target state of charge SOC2.

[0102] According to the performance requirements of the battery cell, the above steps can be repeated 500 to 12000 times in this embodiment. The test data is analyzed. If the voltage at the end of the cycle does not reach the third preset voltage and the internal resistance of the battery cell is normal, it indicates that the power is reasonable and accurate.

[0103] Combination Figure 5 As shown, the working principle of the battery power testing verification method of this application embodiment is explained by another embodiment.

[0104] like Figure 5 As shown, embodiments of this application may include the following steps:

[0105] Step S501: At a second preset ambient temperature, the standard capacity of the target battery is calibrated to obtain a second preset standard capacity. In this embodiment, a fresh battery of the same model and specifications as the battery to be tested can be used as the target battery at a second preset ambient temperature T2, and the standard capacity of the target battery can be calibrated to obtain a second preset standard capacity C2.

[0106] Step S502: Adjust the state of charge of the target battery to the second target state of charge using the second preset current. In this embodiment, the second preset current I2 can be used to adjust the state of charge of the target battery to the second target state of charge SOC2.

[0107] Step S503: The target battery of the second target state of charge is charged with constant current and constant voltage at the same time using preset currents of different intensities, wherein the charging voltage is less than or equal to a fourth preset voltage. The target battery of the second target state of charge SOC2 is charged with different preset currents I. n Constant current and constant voltage charging is performed for the same preset time t3. During the charging process, the charging voltage is less than or equal to the fourth preset voltage.

[0108] Step S504: Fit the second voltage-current characteristic curve obtained from the test, substitute the highest cutoff voltage into the fitting equation to obtain the corresponding maximum charging current, and calculate the theoretical maximum charging power. This embodiment of the application can determine the relationship between the voltage at the end of time t3 and the corresponding pulse current, i.e., the response of the second voltage-current curve; by fitting the second voltage-current characteristic curve obtained from the test and substituting the highest cutoff voltage into the fitting equation, the maximum charging current I under this SOC can be obtained. cha.max And calculate the theoretical maximum charging power P3 of the target battery; where, the theoretical maximum charging power P3 = V cha.max ×I cha.max, where V cha.max This is the highest charging cutoff voltage.

[0109] Step S505: Perform final power verification of the actual maximum charging power of the battery under test.

[0110] Step S506: Convert the second true capacity of the battery under test to obtain the actual maximum charging power of the battery under test. In this embodiment of the application, a battery with a cell at the end of its life cycle can be used as the battery under test. The second true capacity C3 of the off-line cell is converted, and the actual maximum charging power P4 of the battery under test is obtained by combining the second true capacity C3, the second preset standard capacity C2, and the theoretical maximum charging power P3. Wherein, the actual maximum charging power P4 = P3 × C3 / C2.

[0111] Step S507: Adjust the state of charge (SOC) of the battery under test to the second target SOC using the theoretical maximum charging power. In this embodiment, the theoretical maximum charging power P3 can be used to adjust the SOC of the battery under test to the second target SOC2.

[0112] Step S508: Within a second preset time period, the adjusted battery under test is continuously charged at the actual maximum charging power, wherein during the continuous charging process, the charging protection voltage is greater than or equal to a third preset voltage. This embodiment of the application can charge the battery under test with a second target state of charge (SOC2) at a constant power of the actual maximum charging power P4 to a preset time t3, wherein during the continuous charging process, the charging protection voltage is greater than or equal to the third preset voltage.

[0113] Step S509: Use the actual maximum charging power to restore the state of charge (SOC) of the battery under test to the second target SOC. In this embodiment, the actual maximum charging power P4 can be used for SOC adjustment to restore the SOC of the battery under test to the second target SOC2.

[0114] Step S510: Repeat the above steps 500 to 12000 times and analyze the test data. If the voltage at the end of the cycle does not reach the third preset voltage, it indicates that the power is reasonable and accurate.

[0115] It should be noted that, in actual implementation, the battery power testing verification method proposed in this application is not limited to a single temperature and state of charge. It can be verified according to the working temperature window of the battery cell and the working conditions of different states of charge, such as the working temperature range of [-30℃, 60℃] and the state of charge of [0, 100%].

[0116] In summary, the battery power testing verification method proposed in this application can include verification methods for discharge power testing and charging power testing, thereby obtaining the maximum discharge power and maximum charging power of a fresh battery with continuous pulses, determining the cell power parameters at the end of its life, and accurately judging whether the power parameters are reasonable and accurate through the cyclic testing verification method. This helps to evaluate the actual power capability of the cell. The testing and verification methods are accurate, reliable, and easy to operate, facilitating technicians to evaluate the actual power performance of the cell, and making the use of the full life cycle parameters of the vehicle battery more scientific.

[0117] According to the battery power testing verification method proposed in this application, during charging power verification, the actual maximum charging power of the battery under test is obtained by combining the second actual capacity, the first preset standard capacity, and the theoretical maximum charging power. The state of charge (SOC) of the battery under test is adjusted using the theoretical maximum charging power. Within a second preset time period, the adjusted battery under test is continuously charged at the actual maximum charging power. The SOC of the battery under test is then restored using the actual maximum charging power. After reaching a preset cycle stop condition, the cycle-end voltage of the battery under test is tested, and the charging power verification result is obtained based on the cycle-end voltage. This improves testing efficiency and the accuracy of test results. Furthermore, by combining this with the discharge power verification process, power verification of the battery under test throughout its entire lifecycle is achieved. This solves the technical problem in related technologies where battery power performance testing methods are difficult to apply to continuous pulse power discharge conditions in various scenarios, resulting in low accuracy of test results and potential safety hazards.

[0118] Next, with reference to the accompanying drawings, a verification apparatus for battery power testing according to an embodiment of this application is described.

[0119] Figure 6 This is a block diagram of a verification device for battery power testing according to an embodiment of this application.

[0120] like Figure 6 As shown, the battery power testing verification device 20 is used for charging power testing. The device 20 includes: a charging conversion module 201, a charging adjustment module 202, a first charging module 203, and a charging verification module 204.

[0121] Specifically, the charging conversion module 201 is used to convert the second true capacity of the battery under test, and combine the second true capacity, the second preset standard capacity and the theoretical maximum charging power to obtain the actual maximum charging power of the battery under test.

[0122] The charging adjustment module 202 is used to adjust the state of charge of the battery under test to a second target state of charge using the theoretical maximum charging power.

[0123] The first charging module 203 is used to continuously charge the adjusted battery under test according to the actual maximum charging power within a second preset time period, wherein the charging protection voltage is greater than or equal to a third preset voltage during the continuous charging process.

[0124] The charging verification module 204 is used to restore the state of charge of the battery under test to the second target state of charge using the actual maximum charging power, so as to test the cycle end voltage of the battery under test after reaching the preset cycle stop condition, and obtain the charging power verification result of the battery under test based on the cycle end voltage.

[0125] Optionally, in one embodiment of this application, the verification device 20 for battery power testing further includes: a second calibration module, a second adjustment module, a second charging module, a second fitting module, a third calculation module, and a fourth calculation module.

[0126] The second calibration module is used to calibrate the second preset standard capacity of the target battery based on the second preset ambient temperature.

[0127] The second adjustment module is used to adjust the state of charge of the target battery to the second target state of charge using a second preset current.

[0128] The second charging module is used to charge the adjusted target battery with multiple preset currents of different intensities to obtain a second voltage-current characteristic curve, wherein the charging voltage is less than or equal to a fourth preset voltage during the charging process.

[0129] The second fitting module is used to fit the second voltage-current characteristic curve to obtain the second fitting equation.

[0130] The third calculation module is used to input the highest cutoff voltage into the second fitting equation to obtain the maximum charging current of the target battery under the corresponding state of charge.

[0131] The fourth calculation module is used to calculate the theoretical maximum charging power of the target battery based on the minimum cutoff voltage and the maximum charging current.

[0132] Optionally, in one embodiment of this application, the second calibration module includes a control unit and a computing unit.

[0133] The control unit is used to charge and discharge the target battery multiple times using a preset charging strategy and a preset discharging strategy, respectively.

[0134] The calculation unit is used to collect the discharge capacity of the target battery for each discharge, to calculate the average value of the discharge capacity, and to use the average value as the second standard capacity.

[0135] It should be noted that the explanation of the aforementioned verification method embodiment for battery power testing also applies to the verification device for battery power testing in this embodiment, and will not be repeated here.

[0136] The battery power testing verification device proposed in this application can, during charging power verification, obtain the actual maximum charging power of the battery under test by combining the second actual capacity, a first preset standard capacity, and the theoretical maximum charging power. The state of charge (SOC) of the battery under test is adjusted using the theoretical maximum charging power. Within a second preset time period, the adjusted battery under test is continuously charged at the actual maximum charging power. The SOC of the battery under test is then restored using the actual maximum charging power. After reaching a preset cycle stop condition, the cycle-end voltage of the battery under test is tested, and the charging power verification result is obtained based on the cycle-end voltage. This improves testing efficiency and the accuracy of test results. Furthermore, by combining this with the discharge power verification process, power verification of the battery under test throughout its entire lifecycle is achieved. This solves the technical problem in related technologies where battery power performance testing methods are difficult to apply to continuous pulse power discharge conditions in various scenarios, resulting in low accuracy of test results and potential safety hazards.

[0137] Figure 7 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0138] The memory 701, the processor 702, and the computer program stored on the memory 701 and executable on the processor 702.

[0139] When the processor 702 executes the program, it implements the battery power test verification method provided in the above embodiments.

[0140] Furthermore, the vehicle also includes:

[0141] Communication interface 703 is used for communication between memory 701 and processor 702.

[0142] The memory 701 is used to store computer programs that can run on the processor 702.

[0143] The memory 701 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0144] If the memory 701, processor 702, and communication interface 703 are implemented independently, then the communication interface 703, memory 701, and processor 702 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 7 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0145] Optionally, in a specific implementation, if the memory 701, processor 702, and communication interface 703 are integrated on a single chip, then the memory 701, processor 702, and communication interface 703 can communicate with each other through an internal interface.

[0146] The processor 702 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0147] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described verification method for battery power testing.

[0148] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0149] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0150] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0151] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0152] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0153] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0154] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0155] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A verification method for battery power testing, characterized in that, Applied to discharge power testing, the method includes the following steps: The first true capacity of the battery under test is converted, and the actual maximum discharge power of the battery under test is obtained by combining the first true capacity, the first preset standard capacity, and the theoretical maximum discharge power. The actual maximum discharge power is... P1 represents the theoretical maximum discharge power, C1 represents the first actual capacity, and C0 represents the first preset standard capacity. The theoretical maximum discharge power P1 = V dis.cutoff × I dis.max V dis.cutoff Indicates the minimum discharge cutoff voltage, I dis.max Indicates the maximum discharge current; The state of charge of the battery under test is adjusted to the first target state of charge using the theoretical maximum discharge power. Within a first preset time period, the adjusted battery under test is continuously discharged according to the actual maximum discharge power, wherein, during the continuous discharge process, the discharge protection voltage is greater than or equal to the first preset voltage. The state of charge of the battery under test is adjusted to the first target state of charge using the actual maximum discharge power. After reaching the preset cycle stop condition, the cycle end voltage of the battery under test is tested, and the discharge power verification result of the battery under test is obtained based on the cycle end voltage.

2. The method according to claim 1, characterized in that, Before obtaining the actual maximum discharge power of the battery under test by combining the first true capacity, the first preset standard capacity, and the theoretical maximum discharge power, the process further includes: Based on the first preset ambient temperature, the first preset standard capacity of the battery to be tested is calibrated; The state of charge of the battery under test is adjusted to the first target state of charge using a first preset current; The adjusted battery under test is discharged using multiple preset currents of different intensities to obtain a first voltage-current characteristic curve, wherein the discharge voltage is less than or equal to a second preset voltage during the discharge process. The first voltage-current characteristic curve is fitted to obtain the first fitting equation; Substituting the lowest cutoff voltage into the first fitting equation, the maximum discharge current of the battery under test in the corresponding state of charge is obtained. The theoretical maximum discharge power of the battery under test is calculated based on the minimum cutoff voltage and the maximum discharge current.

3. A verification method for battery power testing, characterized in that, Applied to charging power testing, the method includes the following steps: The second true capacity of the battery under test is converted, and the actual maximum charging power of the battery under test is obtained by combining the second true capacity, the second preset standard capacity, and the theoretical maximum charging power. The actual maximum charging power is... P3 represents the theoretical maximum charging power, C3 represents the second actual capacity, and C2 represents the second preset standard capacity. The theoretical maximum charging power P3 = V cha.max × I cha.max V cha.max Indicates the maximum charging cutoff voltage, I cha.max Indicates the maximum charging current; The state of charge of the battery under test is adjusted to the second target state of charge using the theoretical maximum charging power. Within the second preset time period, the adjusted battery under test is continuously charged according to the actual maximum charging power, wherein the charging protection voltage is greater than or equal to the third preset voltage during the continuous charging process. The state of charge of the battery under test is adjusted to the second target state of charge using the actual maximum charging power. After the preset cycle stop condition is reached, the cycle end voltage of the battery under test is tested, and the charging power verification result of the battery under test is obtained based on the cycle end voltage.

4. The method according to claim 3, characterized in that, Before obtaining the actual maximum charging power of the battery under test by combining the second true capacity, the second preset standard capacity, and the theoretical maximum charging power, the process also includes: Based on the second preset ambient temperature, the second preset standard capacity of the battery under test is calibrated. The state of charge of the battery under test is adjusted to the second target state of charge using a second preset current; The adjusted battery under test is charged using multiple preset currents of different intensities to obtain a second voltage-current characteristic curve, wherein the charging voltage is less than or equal to a fourth preset voltage during the charging process. The second voltage-current characteristic curve is fitted to obtain the second fitting equation; Substituting the highest cutoff voltage into the second fitting equation, the maximum charging current of the battery under test in the corresponding state of charge is obtained. The theoretical maximum charging power of the battery under test is calculated based on the highest cutoff voltage and the maximum charging current.

5. The method according to claim 4, characterized in that, The calibration of the second preset standard capacity of the battery under test based on the second preset ambient temperature includes: The battery under test was charged and discharged multiple times using a preset charging strategy and a preset discharging strategy, respectively. The discharge capacity of the battery under test is collected for each discharge to calculate the average value of the discharge capacity, and the average value is used as the second preset standard capacity.

6. A verification device for battery power testing, characterized in that, Applied to discharge power testing, the device includes: The discharge conversion module is used to convert the first true capacity of the battery under test, and combine the first true capacity, the first preset standard capacity, and the theoretical maximum discharge power to obtain the actual maximum discharge power of the battery under test. The actual maximum discharge power... P1 represents the theoretical maximum discharge power, C1 represents the first actual capacity, and C0 represents the first preset standard capacity. The theoretical maximum discharge power P1 = V dis.cutoff × I dis.max V dis.cutoff Indicates the minimum discharge cutoff voltage, I dis.max Indicates the maximum discharge current; The discharge adjustment module is used to adjust the state of charge of the battery under test to a first target state of charge using the theoretical maximum discharge power. The first discharge module is used to continuously discharge the adjusted battery under test according to the actual maximum discharge power within a first preset time period, wherein the discharge protection voltage is greater than or equal to the first preset voltage during the continuous discharge process. The discharge verification module is used to adjust the state of charge of the battery under test to the first target state of charge using the actual maximum discharge power, so as to test the cycle-end voltage of the battery under test after reaching the preset cycle-end voltage, and obtain the discharge power verification result of the battery under test based on the cycle-end voltage.

7. The apparatus according to claim 6, characterized in that, Also includes: The first calibration module is used to calibrate the first preset standard capacity of the battery under test based on the first preset ambient temperature. The first adjustment module is used to adjust the state of charge of the battery under test to the first target state of charge using a first preset current. The second discharge module is used to discharge the adjusted battery under test using multiple preset currents of different intensities to obtain a first voltage-current characteristic curve, wherein the discharge voltage is less than or equal to the second preset voltage during the discharge process. The first fitting module is used to fit the first voltage-current characteristic curve to obtain the first fitting equation; The first calculation module is used to substitute the lowest cutoff voltage into the first fitting equation to obtain the maximum discharge current of the battery under test in the corresponding state of charge. The second calculation module is used to calculate the theoretical maximum discharge power of the battery under test based on the minimum cutoff voltage and the maximum discharge current.

8. A verification device for battery power testing, characterized in that, For use in charging power testing, the device includes: The charging conversion module is used to convert the second true capacity of the battery under test, and combine the second true capacity, the second preset standard capacity, and the theoretical maximum charging power to obtain the actual maximum charging power of the battery under test, wherein the actual maximum charging power is... P3 represents the theoretical maximum charging power, C3 represents the second actual capacity, and C2 represents the second preset standard capacity. The theoretical maximum charging power P3 = V cha.max × I cha.max V cha.max Indicates the maximum charging cutoff voltage, I cha.max Indicates the maximum charging current; A charging adjustment module is used to adjust the state of charge of the battery under test to a second target state of charge using the theoretical maximum charging power. The charging module is used to continuously charge the adjusted battery under test according to the actual maximum charging power within a second preset time period, wherein the charging protection voltage is greater than or equal to a third preset voltage during the continuous charging process. The charging verification module is used to adjust the state of charge of the battery under test to the second target state of charge using the actual maximum charging power, so as to test the cycle-end voltage of the battery under test after reaching the preset cycle-end voltage, and obtain the charging power verification result of the battery under test based on the cycle-end voltage.

9. A vehicle, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the verification method for battery power testing as described in any one of claims 1-2 or 3-5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the verification method for battery power testing as described in any one of claims 1-2 or 3-5.

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