Battery rapid capacity grading method, device, equipment, medium and program product

Abstract

The embodiment of the invention discloses a battery rapid capacity grading method, device and equipment, a medium and a program product. The rapid battery capacity grading method comprises the following steps: testing a first capacitance value of a to-be-tested battery; determining a first battery capacity corresponding to the first capacitance value according to a predetermined corresponding relation between the capacitance value and the battery capacity; and determining the first battery capacity as the battery capacity of the battery to be detected. According to the embodiment of the invention, the capacity of the battery can be safely and efficiently measured.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method, device, equipment, medium, and program product for rapid battery capacity division. Background Art

[0002] With rapid technological advancements and the growing demand for efficient energy, secondary batteries, particularly lithium-ion batteries, are gaining widespread application in numerous fields, including electric vehicles, energy storage systems, and consumer electronics, thanks to their high energy density, long cycle life, and low self-discharge rate. However, performance variations and consistency issues with lithium-ion batteries have been key factors hindering their further development. Lithium-ion battery performance evaluation is a crucial step in both manufacturing and use. Battery capacity is one of the primary performance indicators, directly impacting battery life and performance.

[0003] Battery capacity testing involves testing batteries to determine their actual capacity and performance differences. During the battery production process, even batteries from the same batch can have varying capacities due to factors such as production processes, material differences, and environmental conditions. Capacity testing can identify high-performance batteries, improve battery consistency, and ensure battery safety and reliability.

[0004] Currently, traditional battery capacity grading technology primarily involves constant current charge and discharge. This method measures battery capacity by charging and discharging the battery with a constant current. However, this method requires a long time to complete a complete capacity grading test, resulting in low production efficiency and increased costs. Furthermore, prolonged high current charge and discharge can cause battery temperatures to rise, potentially leading to safety issues. Summary of the Invention

[0005] Embodiments of the present application provide a method, apparatus, device, computer storage medium, and computer program product for rapid battery capacity sizing, which can safely and efficiently measure the capacity of a battery.

[0006] In a first aspect, an embodiment of the present application provides a method for rapid battery capacity division, comprising:

[0007] Testing a first capacitance value of a battery to be tested;

[0008] Determining a first battery capacity corresponding to the first capacitance value according to a predetermined correspondence between capacitance values and battery capacities;

[0009] The first battery capacity is determined as the battery capacity of the battery to be tested.

[0010] In an optional embodiment, before determining the first battery capacity corresponding to the first capacitance value according to the predetermined correspondence between capacitance values and battery capacities, the method further includes:

[0011] Obtaining a second battery capacity corresponding to each of the plurality of calibration batteries;

[0012] Testing the second capacitance value of each calibration battery respectively;

[0013] According to the second capacitance values and the second battery capacities of the plurality of calibration batteries, a corresponding relationship between the capacitance value and the battery capacity is determined.

[0014] In an optional embodiment, testing the second capacitance value of each calibration battery separately includes performing the following steps for each calibration battery separately:

[0015] Perform a swept frequency impedance test on the calibration battery to obtain a swept frequency impedance test result of the calibration battery;

[0016] According to the swept frequency impedance test results of the calibration battery, the characteristic frequency value corresponding to the calibration battery is determined;

[0017] At a characteristic frequency value corresponding to the calibration battery, a fixed-frequency impedance test is performed on the calibration battery to obtain a second capacitance value of the calibration battery.

[0018] In an optional embodiment, performing a swept frequency impedance test on the calibration battery to obtain a swept frequency impedance test result of the calibration battery; and determining a characteristic frequency value corresponding to the calibration battery according to the swept frequency impedance test result of the calibration battery includes:

[0019] Performing a swept frequency impedance test on the calibration battery in a first frequency range to obtain a first swept frequency impedance test result;

[0020] Determine a first frequency value according to the first swept-frequency impedance test result, where the first frequency value corresponds to a frequency value at a point where the absolute value of the imaginary part of the impedance is maximum in the first swept-frequency impedance test result;

[0021] When the first frequency value is not within the second frequency range, the first frequency value is determined as a characteristic frequency value corresponding to the calibration battery, wherein the second frequency range is a preset boundary frequency range corresponding to the first frequency range.

[0022] In an optional embodiment, after determining the first frequency value according to the first swept-frequency impedance test result, the method further includes:

[0023] When the first frequency value is within the second frequency range, performing a swept frequency impedance test on the calibration battery within a third frequency range to obtain a second swept frequency impedance test result;

[0024] Determine a second frequency value according to the second swept-frequency impedance test result, where the second frequency value corresponds to a frequency value at a point where the absolute value of the imaginary part of the impedance is maximum in the second swept-frequency impedance test result;

[0025] The second frequency value is determined as the characteristic frequency value corresponding to the calibration battery.

[0026] In an optional embodiment, performing a fixed-frequency impedance test on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a second capacitance value of the calibration battery includes:

[0027] Perform a fixed-frequency impedance test on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a fixed-frequency impedance test result;

[0028] According to the fixed frequency impedance test results, determine the imaginary impedance value of the calibration battery;

[0029] According to the characteristic frequency value and the imaginary part value of the impedance corresponding to the calibration battery, the second battery capacity of the calibration battery is calculated by formula 1;

[0030]

[0031] In formula 1, C represents the second battery capacity of the calibration battery;

[0032] f represents the characteristic frequency value corresponding to the calibration battery;

[0033] Z" represents the imaginary impedance value of the calibration battery.

[0034] In an optional embodiment, determining a correspondence between capacitance values and battery capacities based on second capacitance values and second battery capacities of a plurality of calibration batteries includes:

[0035] The second capacitance values and the second battery capacities of the plurality of calibration batteries are linearly fitted to obtain a corresponding relationship between the capacitance values and the battery capacities.

[0036] In an optional embodiment, after determining the correspondence between the capacitance value and the battery capacity based on the second capacitance values and the second battery capacity of the plurality of calibration batteries, the method further includes:

[0037] Obtaining a third battery capacity corresponding to at least one verification battery;

[0038] Testing and verifying the third capacitance value of the battery;

[0039] The correspondence between the capacitance value and the battery capacity is verified according to the third capacitance value of the third battery capacity corresponding to the at least one verification battery and the third battery capacity.

[0040] In an optional embodiment, testing the first capacitance value of the battery to be tested includes:

[0041] Perform a swept frequency impedance test on the battery to be tested to obtain a swept frequency impedance test result of the battery to be tested;

[0042] Determine the characteristic frequency value corresponding to the battery under test according to the swept frequency impedance test result of the battery under test;

[0043] At a characteristic frequency value corresponding to the battery to be tested, a fixed-frequency impedance test is performed on the battery to be tested to obtain a first capacitance value of the battery to be tested.

[0044] In a second aspect, an embodiment of the present application provides a battery rapid capacity division device, comprising:

[0045] A testing module, configured to test a first capacitance value of a battery to be tested;

[0046] a determination module, configured to determine a first battery capacity corresponding to a first capacitance value based on a predetermined correspondence between capacitance values and battery capacities;

[0047] The determination module is further configured to determine the first battery capacity as the battery capacity of the battery to be tested.

[0048] In a third aspect, an embodiment of the present application provides an electronic device, the device comprising: a processor and a memory storing computer program instructions;

[0049] When the processor executes the computer program instructions, the battery rapid capacity division method according to any optional embodiment of the first aspect of the present application is implemented.

[0050] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, a method for rapid battery capacity division according to any optional embodiment of the first aspect of the present application is implemented.

[0051] In a fifth aspect, an embodiment of the present application provides a computer program product. When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes a battery rapid capacity division method as described in any optional embodiment of the first aspect of the present application.

[0052] The battery rapid capacity division method, device, equipment, computer storage medium and computer program product of the embodiment of the present application can test the first capacitance value of the battery to be tested, and then determine the first battery capacity corresponding to the first capacitance value based on the predetermined correspondence between the capacitance value and the battery capacity. The first battery capacity is determined as the battery capacity of the battery to be tested. According to the embodiment of the present application, on the basis of pre-established correspondence between the capacitance value and the battery capacity, a single capacity division test of the battery to be tested can be completed in only a few seconds. In this way, not only can the time of the battery capacity division test be significantly reduced and the consumption of the battery capacity division test be reduced, but also the potential safety hazards caused by long-term high-current charging and discharging can be avoided, thereby safely and efficiently measuring the capacity of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0054] Figure 1 This is a flow chart of a method for rapid battery capacity division provided by one embodiment of the present application;

[0055] Figure 2 This is a graph showing the results of a swept-frequency impedance test of a lithium-ion battery provided in Example 1 of the present application;

[0056] Figure 3 This is a graph showing the results of a constant-frequency impedance test of a lithium-ion battery at its characteristic frequency provided in Example 1 of the present application;

[0057] Figure 4 1 is a graph showing the calculated capacitance value of the lithium-ion battery according to Example 1 of the present application;

[0058] Figure 5 This is a diagram showing the battery capacity-capacitance linear equation fitting results of Example 1 of the present application;

[0059] Figure 6 1 is a schematic structural diagram of a battery rapid capacity division device provided in yet another embodiment of the present application;

[0060] Figure 7 A schematic structural diagram of an electronic device is provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0061] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0062] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0063] As described in the background art, in current battery capacity division technology, long-term high-current charging and discharging may cause the battery temperature to rise and even cause safety problems.

[0064] In view of this, the present application proposes a method, device, equipment, computer storage medium and computer program product for rapid battery capacity division.

[0065] The following, in conjunction with the accompanying drawings, introduces the battery rapid capacity division method provided by the embodiment of the present application through specific embodiments and their application scenarios. The battery rapid capacity division method provided by the embodiment of the present application, the device that executes the sending can be a battery rapid capacity division device, or a partial module of the battery rapid capacity division device that is used to execute the battery rapid capacity division method. In the embodiment of the present application, the battery rapid capacity division method provided by the embodiment of the present application is described in detail by taking the battery rapid capacity division device executing the battery rapid capacity division method as an example.

[0066] The following is combined with Figure 1 The battery rapid capacity division method provided in the embodiments of the present application is described in detail.

[0067] Figure 1 FIG1 shows a flow chart of a method for rapid battery capacity division according to an embodiment of the present application. Figure 1 As shown, the battery rapid capacity division method may specifically include the following steps S110 to S130.

[0068] S110 , testing a first capacitance value of the battery to be tested.

[0069] In step S110, the first capacitance value of the battery to be tested is measured. This can be performed when the battery to be tested is in a non-charged or non-discharged state, or in a state with a micro-current disturbance. In the embodiment of the present application, the capacitance value can be measured by methods known in the art, which are not limited here. For example, the first capacitance value of the battery to be tested can be measured using an impedance analyzer.

[0070] S120 , determining a first battery capacity corresponding to the first capacitance value according to a predetermined correspondence between capacitance values and battery capacities.

[0071] In step S120, the predetermined correspondence between the capacitance value and the battery capacity may be a linear relationship, or may be a correspondence between the capacitance value and the battery capacity fitted by a machine learning algorithm. As an example, the above correspondence is a linear relationship, and the first capacitance value may be substituted into the linear relationship equation to calculate the first battery capacity corresponding to the first capacitance value. As another example, the above object relationship is a correspondence between the capacitance value and the battery capacity fitted by a machine learning algorithm, and the first capacitance value may be input into a trained battery capacity analysis model. The battery capacity analysis model calculates and outputs the first battery capacity corresponding to the first capacitance value based on the pre-fitted correspondence between the capacitance value and the battery capacity.

[0072] S130: Determine the first battery capacity as the battery capacity of the battery to be tested.

[0073] In the embodiment of the present application, the battery to be tested may include but is not limited to lithium-ion batteries, sodium-ion batteries, and other batteries that realize charging and discharging by embedding and extracting active ions (such as lithium ions or sodium ions) between the positive and negative electrodes.

[0074] Without intending to be bound by any theory or explanation, the inventors of the present application have discovered that the capacitance value of the above-mentioned type of battery is related to the degree of embedding of active ions in the negative electrode. For example, in a lithium-ion battery, as lithium ions are embedded, the surface area of the graphite negative electrode and other factors will change, thereby causing a change in the battery capacitance value. The change in battery capacity is directly related to the degree of lithium embedding in the negative electrode. It can be seen that there is a specific corresponding relationship between the capacitance value of the battery and the capacity of the battery. After further research, the inventors found that there is a linear correlation between the capacitance value of the above-mentioned type of battery and the battery capacity.

[0075] The battery rapid capacity division method of the embodiment of the present application can test the first capacitance value of the battery to be tested, and then determine the first battery capacity corresponding to the first capacitance value based on the predetermined correspondence between the capacitance value and the battery capacity. The first battery capacity is determined as the battery capacity of the battery to be tested. According to the embodiment of the present application, based on the pre-established correspondence between the capacitance value and the battery capacity, a single capacity division test of the battery to be tested can be completed in only a few seconds. In this way, not only can the time of the battery capacity division test be significantly reduced and the consumption of the battery capacity division test be reduced, but also the potential safety hazards caused by long-term high-current charging and discharging can be avoided, thereby safely and efficiently measuring the capacity of the battery.

[0076] In some embodiments, the battery under test may include a battery that has been prepared but has not yet undergone formation or charge-discharge cycles. According to the methods of the embodiments of the present application, the capacity of the battery under test can be determined simply by measuring the capacitance of the battery under test in a non-charged or non-discharged state, or in the presence of a microcurrent disturbance, without requiring charge or discharge cycles. Therefore, capacity separation can be performed before the battery under test is formed, thereby improving the efficiency of battery capacity separation.

[0077] In some embodiments, before determining the first battery capacity corresponding to the first capacitance value according to the predetermined correspondence between capacitance values and battery capacities, the method may further include:

[0078] Obtain a second battery capacity corresponding to each of the multiple calibration batteries.

[0079] The second capacitance value of each calibration battery is tested respectively.

[0080] According to the second capacitance values and the second battery capacities of the plurality of calibration batteries, a corresponding relationship between the capacitance value and the battery capacity is determined.

[0081] In the above embodiment, the calibration battery can be a battery of known capacity. The capacity of the calibration battery can be measured by a constant current charge-discharge method. Specifically, the calibration battery can be charged to a charge cut-off voltage at a constant current of 0.1C to 1C (for example, a constant current of 0.2C), and then discharged to a discharge cut-off voltage at a constant current. The battery capacity of the calibration battery (i.e., the second battery capacity of the calibration battery) is determined based on the charge-discharge curve.

[0082] In some examples, the calibration battery can be a battery that uses the same types of battery materials and has the same structure as the battery under test. The same types of battery materials used in the calibration battery as in the battery under test can mean that the types of positive active materials, negative active materials, and electrolyte systems used in the calibration battery are the same as those in the battery under test. For example, the positive active materials are all lithium iron phosphate, the negative active materials are all carbon materials, and the electrolytes are all carbonate electrolytes, etc. The same structure in the calibration battery as in the battery under test can mean that both the calibration battery and the battery under test are laminated batteries or wound batteries. When both are laminated batteries, the number and arrangement of positive and negative electrode plates are the same; when both are wound batteries, the number of windings is the same. In some examples, the calibration battery can be a battery with the same specifications as the battery under test. The same specifications in the calibration battery as in the battery under test can mean that the types of battery materials used in the calibration battery and their proportions are the same as those in the battery under test, and the structure of the calibration battery is also the same as that of the battery under test. In this way, the calibration battery and the battery under test are similar batteries, and both have essentially the same capacitance-to-capacity correspondence. Determining the capacitance-to-capacity correspondence based on the second capacitance values and second capacities of the multiple calibration batteries can improve the accuracy of the test results when used for different capacity tests of the battery under test.

[0083] In the above embodiment, the correspondence between the capacitance value and the battery capacity is determined based on the second capacitance values and the second battery capacity of multiple calibrated batteries, which may include but is not limited to fitting the linear relationship between the capacitance value and the battery capacity through the second capacitance values and the second battery capacity of multiple calibrated batteries, or using the second capacitance values and the second battery capacity of multiple calibrated batteries as multiple training samples to train a pre-created battery capacity analysis model, so as to obtain a trained battery capacity analysis model by fitting the correspondence between the capacitance value and the battery capacity according to the training samples through the model.

[0084] According to the above embodiment, by measuring the capacitance values of multiple calibration batteries of known capacity, a corresponding relationship between the capacitance values and the battery capacities is determined based on the second capacitance values and the second battery capacities of the multiple calibration batteries. This corresponding relationship between the capacitance values and the battery capacities is applied to the rapid battery capacity classification method, which is beneficial for improving the efficiency and accuracy of the method.

[0085] In some embodiments, testing the second capacitance value of each calibration battery separately may include performing the following steps for each calibration battery separately:

[0086] Perform a swept frequency impedance test on the calibration battery to obtain a swept frequency impedance test result of the calibration battery.

[0087] According to the swept frequency impedance test results of the calibration battery, the characteristic frequency value corresponding to the calibration battery is determined.

[0088] At a characteristic frequency value corresponding to the calibration battery, a fixed-frequency impedance test is performed on the calibration battery to obtain a second capacitance value of the calibration battery.

[0089] According to the above embodiment, after determining the characteristic frequency value corresponding to the calibration battery using the swept-frequency impedance test results, a fixed-frequency impedance test is then performed on the calibration battery at the characteristic frequency value corresponding to the calibration battery. This improves the accuracy of measuring the second capacitance value of the calibration battery, thereby improving the accuracy of determining the corresponding relationship between capacitance value and battery capacity. Furthermore, the accuracy of measuring the capacity of the battery to be tested can be improved.

[0090] In some embodiments, performing a swept frequency impedance test on a calibration battery to obtain a swept frequency impedance test result of the calibration battery; and determining a characteristic frequency value corresponding to the calibration battery based on the swept frequency impedance test result of the calibration battery may specifically include:

[0091] A swept frequency impedance test is performed on the calibration battery in a first frequency range to obtain a first swept frequency impedance test result.

[0092] A first frequency value is determined according to the first swept-frequency impedance test result. The first frequency value is a frequency value corresponding to a point with a maximum absolute value of an imaginary part of the impedance in the first swept-frequency impedance test result.

[0093] When the first frequency value is not within the second frequency range, the first frequency value is determined as a characteristic frequency value corresponding to the calibration battery, wherein the second frequency range is a preset boundary frequency range corresponding to the first frequency range.

[0094] In the above embodiment, the first frequency range can be determined based on the type of calibration battery. As an example, if the calibration battery is a lithium-ion battery, the first frequency range can be 1 to 100 Hz. The second frequency range can be determined based on actual needs. For example, the second frequency range can be a frequency range within 1 Hz of the boundary value of the first frequency range. For example, the first frequency range can be 1 to 100 Hz, and the second frequency range can be a range consisting of 1 to 2 Hz and 99 Hz to 100 Hz.

[0095] According to the above embodiment, the swept frequency impedance test result of the calibration battery can be performed according to the preset frequency range. If the frequency value corresponding to the maximum absolute value point of the imaginary part of the impedance is not at the boundary frequency anti-counterfeiting of the preset frequency range, the frequency value corresponding to the maximum absolute value point of the imaginary part of the impedance is determined as the characteristic frequency value of the calibration battery. This is conducive to improving the accuracy of the measurement of the characteristic frequency value of the calibration battery, thereby improving the accuracy of the measurement of the second capacitance value of the calibration battery.

[0096] In some embodiments, after determining the first frequency value according to the first swept-frequency impedance test result, the method may further include:

[0097] When the first frequency value is within the second frequency range, a swept frequency impedance test is performed on the calibration battery within a third frequency range to obtain a second swept frequency impedance test result.

[0098] A second frequency value is determined according to the second swept-frequency impedance test result. The second frequency value is the frequency value corresponding to the maximum absolute value of the imaginary part of the impedance in the second swept-frequency impedance test result.

[0099] The second frequency value is determined as the characteristic frequency value corresponding to the calibration battery.

[0100] In the above embodiment, the third frequency range may be a range determined according to the first frequency value. For example, the first frequency range may be 1 to 100 Hz, the first frequency value may be 2 Hz, and the third frequency range may be 1 Hz to 10 Hz.

[0101] According to the above embodiment, when the measured first frequency value is within the boundary range of the first frequency range, the test frequency range of the swept frequency impedance test can be adjusted and the swept frequency impedance test can be re-performed. This is conducive to improving the accuracy of measuring the characteristic frequency value of the calibrated battery, thereby improving the accuracy of measuring the second capacitance value of the calibrated battery.

[0102] In some embodiments, performing a fixed-frequency impedance test on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a second capacitance value of the calibration battery may specifically include:

[0103] A fixed-frequency impedance test is performed on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a first fixed-frequency impedance test result.

[0104] According to the first constant-frequency impedance test result, the imaginary part value of the impedance of the calibration battery is determined.

[0105] According to the characteristic frequency value and the imaginary part value of the impedance corresponding to the calibration battery, the second capacitance value of the calibration battery is calculated by formula 1.

[0106]

[0107] In Formula 1, C represents the second capacitance value of the calibration battery; f represents the characteristic frequency value corresponding to the calibration battery; and Z" represents the imaginary part value of the impedance of the calibration battery.

[0108] In this way, the second capacitance value of the calibrated battery can be accurately measured, thereby accurately determining the corresponding relationship between the capacitance value and the battery capacity.

[0109] In some embodiments, determining the correspondence between the capacitance value and the battery capacity based on the second capacitance values and the second battery capacity of a plurality of calibration batteries may specifically include:

[0110] The second capacitance values and the second battery capacities of the plurality of calibration batteries are linearly fitted to obtain a corresponding relationship between the capacitance values and the battery capacities.

[0111] In this way, the corresponding relationship between capacitance value and battery capacity can be determined quickly and accurately, thereby further improving the efficiency and accuracy of the battery rapid capacity division method.

[0112] In some embodiments, after determining the correspondence between the capacitance value and the battery capacity based on the second capacitance values and the second battery capacity of the plurality of calibration batteries, the method may further include:

[0113] A third battery capacity corresponding to at least one verification battery is obtained.

[0114] The test verifies the third capacitance value of the battery.

[0115] The correspondence between the capacitance value and the battery capacity is verified according to the third capacitance value of the third battery capacity corresponding to the at least one verification battery and the third battery capacity.

[0116] In the above embodiment, the verification battery can be a battery with a known capacity. The capacity determination method for the verification battery can be the same as that for the calibration battery, and will not be described in detail here. In some examples, the calibration battery can be a battery using the same battery material and structure as the calibration battery. In some examples, the verification battery can be a battery with the same specifications as the calibration battery.

[0117] In one example, after testing and verifying the third capacitance value of the battery, the third capacitance value can be substituted into the correspondence between the capacitance value and the battery capacity to calculate the measured battery capacity corresponding to the third capacitance value. Subsequently, the verification result of the correspondence between the capacitance value and the battery capacity can be obtained based on the third battery capacity and the measured battery capacity. For example, the deviation value of the correspondence between the capacitance value and the battery capacity can be determined based on the difference between the third battery capacity and the measured battery capacity. If the deviation value is less than or equal to the preset deviation threshold, the correspondence between the capacitance value and the battery capacity passes the verification; otherwise, the correspondence between the capacitance value and the battery capacity fails the verification. However, it is not limited to this. For example, the deviation value of the correspondence between the capacitance value and the battery capacity can also be determined based on the percentage of the difference between the third battery capacity and the measured battery capacity in the third battery capacity, and so on. In one example, if the correspondence between the capacitance value and the battery capacity fails to pass the verification, the second capacitance value and the second battery capacity corresponding to the new plurality of calibration batteries can be used to refit the correspondence between the capacitance value and the battery capacity.

[0118] According to the above embodiment, the correspondence between the capacitance value and the battery capacity can be verified by verifying the third capacitance value and the third battery capacity corresponding to the third battery capacity of the battery, thereby improving the reliability of the correspondence between the capacitance value and the battery capacity.

[0119] In some embodiments, testing the first capacitance value of the battery to be tested may specifically include:

[0120] Perform a swept frequency impedance test on the battery to be tested to obtain a swept frequency impedance test result of the battery to be tested.

[0121] According to the swept frequency impedance test results of the battery to be tested, the characteristic frequency value corresponding to the battery to be tested is determined.

[0122] At a characteristic frequency value corresponding to the battery to be tested, a fixed-frequency impedance test is performed on the battery to be tested to obtain a first capacitance value of the battery to be tested.

[0123] According to the above embodiment, after determining the characteristic frequency value corresponding to the battery under test through the swept-frequency impedance test results, a fixed-frequency impedance test is then performed on the battery under test at the characteristic frequency value corresponding to the battery under test. This improves the accuracy of measuring the first capacitance value of the battery under test, thereby improving the accuracy of measuring the capacity of the battery under test.

[0124] In some embodiments, performing a swept frequency impedance test on the battery to be tested to obtain a swept frequency impedance test result of the battery to be tested; and determining a characteristic frequency value corresponding to the battery to be tested based on the swept frequency impedance test result of the battery to be tested may specifically include:

[0125] A swept frequency impedance test is performed on the battery to be tested in the fourth frequency range to obtain a third swept frequency impedance test result.

[0126] A third frequency value is determined according to the third swept-frequency impedance test result. The third frequency value is the frequency value corresponding to the maximum absolute value of the imaginary part of the impedance in the third swept-frequency impedance test result.

[0127] When the third frequency value is not within the fifth frequency range, the third frequency value is determined as the characteristic frequency value corresponding to the battery to be tested, wherein the fifth frequency range is a boundary frequency range corresponding to the preset fourth frequency range.

[0128] In the above embodiment, the fourth frequency range can be similar in definition and scope to the first frequency range, and the fifth frequency range can be similar in meaning and scope to the second frequency range. The only difference is that the fourth and fifth frequency ranges are intended for testing batteries under test, while the first and second frequency ranges are intended for testing calibration batteries. The first and second frequency ranges have been described above and will not be repeated here.

[0129] In some embodiments, after determining the third frequency value according to the third swept-frequency impedance test result, the method may further include:

[0130] When the third frequency value is within the fifth frequency range, a swept frequency impedance test is performed on the calibration battery within the sixth frequency range to obtain a fourth swept frequency impedance test result.

[0131] A fourth frequency value is determined according to the fourth swept-frequency impedance test result. The fourth frequency value is a frequency value corresponding to a point with a maximum absolute value of an imaginary part of the impedance in the fourth swept-frequency impedance test result.

[0132] The fourth frequency value is determined as the characteristic frequency value corresponding to the battery to be tested.

[0133] In the above embodiment, the sixth frequency range can have a similar meaning and range to the third frequency range, with the only difference being that the sixth frequency range is used to test batteries, while the third frequency range is used to test calibration batteries. The third frequency range has been described above and will not be repeated here.

[0134] In some embodiments, performing a fixed-frequency impedance test on the battery to be tested at a characteristic frequency value corresponding to the battery to be tested to obtain a first capacitance value of the battery to be tested may specifically include:

[0135] At the characteristic frequency value corresponding to the battery to be tested, a fixed-frequency impedance test is performed on the battery to be tested to obtain a second fixed-frequency impedance test result.

[0136] The imaginary part value of the impedance of the battery to be tested is determined according to the second constant-frequency impedance test result.

[0137] According to the characteristic frequency value and the imaginary part value of the impedance corresponding to the battery to be tested, the first capacitance value of the battery to be tested is calculated by using Formula 2.

[0138]

[0139] In Formula 2, C0 represents the first capacitance value of the battery under test; f0 represents the characteristic frequency value corresponding to the battery under test; and Z0″ represents the imaginary part value of the impedance of the battery under test.

[0140] For ease of understanding, the contents disclosed in this application are described below with reference to various embodiments of the method for rapid battery capacity division through examples.

[0141] Example

[0142] The following examples describe the present disclosure in more detail and are intended to be illustrative only, as various modifications and variations within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are by weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods and used directly without further processing, and all instruments used in the examples are commercially available.

[0143] Example 1

[0144] LiNi 0.8 Co 0.1 Mn 0.1 Establishment of capacity-capacitance relationship of O2(NCM811)-graphite full battery

[0145] (1) Assembly of NCM811-graphite full battery: The graphite negative electrode uses mesophase carbon microbeads (MCMB). According to the mass ratio of MCMB, conductive carbon black (Supper P), and polyvinylidene fluoride (PVDF) of 8:1:1, MCMB, Supper P, and PVDF are mixed with an appropriate amount of N-methylpyrrolidone (NMP) to obtain a negative electrode slurry. After the negative electrode slurry is coated on the negative electrode current collector copper foil, it is dried in a blast dryer for 24 hours to obtain a negative electrode sheet. The ternary material NCM811 is selected as the positive electrode material. According to the mass ratio of NCM811: conductive carbon black: PVDF of 9:0.5:0.5, it is mixed with an appropriate amount of NMP to obtain a positive electrode slurry. The positive electrode slurry is coated on the surface of aluminum foil and dried in a blast drying oven for 24 hours to obtain a surface capacity of 2mA h cm -2 The positive electrode is made of a 1 mol / L lithium hexafluorophosphate (LiPF6) electrolyte, and the electrolyte solvent is a mixture of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (the volume ratio of EC to EMC is 1:2). The positive electrode, separator, and negative electrode are stacked in order, with the separator positioned between the positive and negative electrodes to provide insulation. This process yields a laminated battery cell. The laminated battery cell is placed in an outer packaging shell, dried, and then injected with electrolyte. The battery is then vacuum-sealed to obtain a battery.

[0146] (2) Battery formation and capacity test: The assembled battery is given a formation current of 0.05C to stimulate the active materials in the positive and negative electrodes, giving the battery discharge capacity. A constant current charge and discharge test of 0.05C is then performed to obtain the battery capacity.

[0147] (3) Battery capacitance test: After the battery has been tested for capacity, a sweep impedance test is performed. The test results are as follows: Figure 2 As shown. Figure 2 The characteristic frequency of the battery is obtained from the test results. Then, a fixed frequency impedance test is performed at this characteristic frequency to obtain the battery impedance information. The test results are as follows: Figure 3 Based on Figure 3 The impedance imaginary part data in the results shown in the figure is used to calculate the corresponding capacitance value. The calculation results are as follows: Figure 4 shown.

[0148] (4) Obtaining the battery capacity-capacitance curve: Analyze the capacity and capacitance data of all batteries and plot them. The battery capacity-capacitance linear equation can be determined by fitting. The fitting results are as follows: Figure 5 shown.

[0149] Example 2

[0150] NCM811-Graphite full battery capacity interpolation verification

[0151] (1) Assembly of NCM811-graphite full battery: The graphite negative electrode uses mesophase carbon microbeads (MCMB). According to the mass ratio of MCMB, conductive carbon black (Supper P), and polyvinylidene fluoride (PVDF) of 8:1:1, MCMB, Supper P, and PVDF are mixed with an appropriate amount of N-methylpyrrolidone (NMP) to obtain a negative electrode slurry. After the negative electrode slurry is coated on the negative electrode current collector copper foil, it is dried in a blast dryer for 24 hours to obtain a negative electrode sheet. The ternary material NCM811 is selected as the positive electrode material. According to the mass ratio of NCM811: conductive carbon black: PVDF of 9:0.5:0.5, it is mixed with an appropriate amount of NMP to obtain a positive electrode slurry. The positive electrode slurry is coated on the surface of aluminum foil and dried in a blast drying oven for 24 hours to obtain a surface capacity of 2mA h cm -2 The positive electrode is made of a 1 mol / L lithium hexafluorophosphate (LiPF6) electrolyte, and the electrolyte solvent is a mixture of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (the volume ratio of EC to EMC is 1:2). The positive electrode, separator, and negative electrode are stacked in order, with the separator positioned between the positive and negative electrodes to provide insulation. This process yields a laminated battery cell. The laminated battery cell is placed in an outer packaging shell, dried, and then injected with electrolyte. The battery is then vacuum-sealed to obtain a battery.

[0152] (2) Battery formation and capacity test: Same as Example 1, the capacity measurement result was 31.76 Ah.

[0153] (3) Battery capacitance test: A battery with a capacity within the range of the battery capacity-capacitance curve measured in Example 1 was selected. After the capacity test, a swept frequency impedance test was performed to obtain the characteristic frequency; then a characteristic frequency fixed frequency impedance test was performed to obtain the battery impedance information; the corresponding capacitance value was calculated based on the impedance imaginary part data, and the calculated result was 7.31F.

[0154] (4) Capacity verification: The capacity of the battery was calculated using the capacitance value and the battery capacity-capacitance linear equation determined in Example 1. The calculated result was 31.72 Ah, and compared with the capacity measurement result in step (2). The calculated relative error was 0.13%.

[0155] Example 3

[0156] NCM811-Graphite Full Battery Capacity Extrapolation Verification

[0157] (1) Assembly of NCM811-graphite full battery: The graphite negative electrode uses mesophase carbon microbeads (MCMB). According to the mass ratio of MCMB, conductive carbon black (Supper P), and polyvinylidene fluoride (PVDF) of 8:1:1, MCMB, Supper P, and PVDF are mixed with an appropriate amount of N-methylpyrrolidone (NMP) to obtain a negative electrode slurry. After the negative electrode slurry is coated on the negative electrode current collector copper foil, it is dried in a blast dryer for 24 hours to obtain a negative electrode sheet. The ternary material NCM811 is selected as the positive electrode material. According to the mass ratio of NCM811: conductive carbon black: PVDF of 9:0.5:0.5, it is mixed with an appropriate amount of NMP to obtain a positive electrode slurry. The positive electrode slurry is coated on the surface of aluminum foil and dried in a blast drying oven for 24 hours to obtain a surface capacity of 2mA h cm -2 The positive electrode is made of a 1 mol / L lithium hexafluorophosphate (LiPF6) electrolyte, and the electrolyte solvent is a mixture of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (the volume ratio of EC to EMC is 1:2). The positive electrode, separator, and negative electrode are stacked in order, with the separator positioned between the positive and negative electrodes to provide insulation. This process yields a laminated battery cell. The laminated battery cell is placed in an outer packaging shell, dried, and then injected with electrolyte. The battery is then vacuum-sealed to obtain a battery.

[0158] (2) Battery formation and capacity test: Same as Example 1, the capacity measurement result was 28.76 Ah.

[0159] (3) Battery capacitance test: Select batteries with a capacity outside the range of the battery capacity-capacitance curve. After the capacity test, perform a swept frequency impedance test to obtain the characteristic frequency; then perform a characteristic frequency fixed frequency impedance test to obtain the battery impedance information; calculate the corresponding capacitance value based on the impedance imaginary part data, and the calculated result is 28.29F.

[0160] (4) Capacity verification: The capacity of the battery was calculated using the capacitance value and the battery capacity-capacitance linear equation determined in Example 1. The calculated result was 28.78 Ah. The result was compared with the capacity measurement result in step (2), and the calculated relative error was 0.07%.

[0161] Based on the same inventive concept as the battery rapid capacity division method, an embodiment of the present application further provides a battery rapid capacity division device.

[0162] like Figure 6 As shown, the battery rapid capacity division device 200 may include a first testing module 201 and a first determining module 202 .

[0163] The first testing module 201 is used to test a first capacitance value of a battery to be tested.

[0164] The first determining module 202 is configured to determine a first battery capacity corresponding to a first capacitance value according to a predetermined correspondence between capacitance values and battery capacities.

[0165] The first determining module 202 is further configured to determine the first battery capacity as the battery capacity of the battery to be tested.

[0166] The battery rapid capacity division device of the embodiment of the present application is capable of testing the first capacitance value of the battery to be tested, and then determining the first battery capacity corresponding to the first capacitance value based on the predetermined correspondence between the capacitance value and the battery capacity. The first battery capacity is determined as the battery capacity of the battery to be tested. According to the embodiment of the present application, on the basis of pre-established correspondence between the capacitance value and the battery capacity, a single capacity division test of the battery to be tested can be completed in just a few seconds. In this way, not only can the time of the battery capacity division test be significantly reduced and the consumption of the battery capacity division test be reduced, but also the potential safety hazards caused by long-term high-current charging and discharging can be avoided, thereby safely and efficiently measuring the capacity of the battery.

[0167] In some embodiments, the apparatus may further include:

[0168] The first acquisition module is configured to acquire the second battery capacity corresponding to each of the plurality of calibration batteries before determining the first battery capacity corresponding to the first capacitance value according to a predetermined correspondence between the capacitance value and the battery capacity.

[0169] The second testing module is used to test the second capacitance value of each calibration battery respectively.

[0170] The second determining module is configured to determine a correspondence between capacitance values and battery capacities according to second capacitance values and second battery capacities of a plurality of calibration batteries.

[0171] In some embodiments, the second testing module is used to test the second capacitance value of each calibration battery separately, including:

[0172] The first test submodule is used to perform a swept frequency impedance test on each calibration battery to obtain a swept frequency impedance test result of the calibration battery.

[0173] The first determination submodule is used to determine the characteristic frequency value corresponding to the calibration battery according to the swept frequency impedance test result of the calibration battery.

[0174] The first testing submodule is further configured to perform a fixed-frequency impedance test on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a second capacitance value of the calibration battery.

[0175] In some embodiments, the first testing submodule is configured to perform a swept frequency impedance test on the calibration battery to obtain a swept frequency impedance test result of the calibration battery; and the first determining submodule determines a characteristic frequency value corresponding to the calibration battery based on the swept frequency impedance test result of the calibration battery, which may specifically include:

[0176] The first testing unit is used to perform a swept frequency impedance test on the calibration battery in a first frequency range to obtain a first swept frequency impedance test result.

[0177] The first determining unit is configured to determine a first frequency value according to the first swept-frequency impedance test result, where the first frequency value is a frequency value corresponding to a point with a maximum absolute value of an imaginary part of the impedance in the first swept-frequency impedance test result.

[0178] The first determining unit is further configured to determine the first frequency value as a characteristic frequency value corresponding to the calibrated battery when the first frequency value is not within a second frequency range, wherein the second frequency range is a boundary frequency range corresponding to the preset first frequency range.

[0179] In some embodiments, the apparatus may further include:

[0180] The third test module is used to determine the first frequency value according to the first swept frequency impedance test result, and when the first frequency value is within the second frequency range, perform a swept frequency impedance test on the calibration battery in a third frequency range to obtain a second swept frequency impedance test result.

[0181] The third determining module is configured to determine a second frequency value according to the second swept-frequency impedance test result, where the second frequency value is the frequency value corresponding to the maximum absolute value of the imaginary part of the impedance in the second swept-frequency impedance test result.

[0182] The third determining module is further configured to determine the second frequency value as a characteristic frequency value corresponding to the calibration battery.

[0183] In some embodiments, the first testing submodule is configured to perform a fixed-frequency impedance test on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a second capacitance value of the calibration battery, which may specifically include:

[0184] The second testing unit is used to perform a fixed-frequency impedance test on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a fixed-frequency impedance test result.

[0185] The second determining unit is used to determine the imaginary part value of the impedance of the calibrated battery according to the fixed-frequency impedance test result.

[0186] The calculation unit is used to calculate the second capacitance value of the calibration battery through Formula 1 according to the characteristic frequency value and the imaginary part value of the impedance corresponding to the calibration battery.

[0187]

[0188] In Formula 1, C represents the second capacitance value of the calibration battery; f represents the characteristic frequency value corresponding to the calibration battery; and Z" represents the imaginary part value of the impedance of the calibration battery.

[0189] In some embodiments, the second determining module is configured to determine a correspondence between capacitance values and battery capacities based on second capacitance values and second battery capacities of a plurality of calibration batteries, and may specifically include:

[0190] The fitting submodule is used to perform linear fitting on the second capacitance values and the second battery capacities of the plurality of calibration batteries, thereby obtaining a corresponding relationship between the capacitance values and the battery capacities.

[0191] In some embodiments, the apparatus may further include:

[0192] The second acquisition module is configured to obtain a third battery capacity corresponding to at least one verification battery after determining a correspondence between capacitance values and battery capacities based on the second capacitance values and second battery capacities of the plurality of calibration batteries.

[0193] The fourth testing module is used to test and verify a third capacitance value of the battery.

[0194] The verification module is configured to verify a correspondence between the capacitance value and the battery capacity according to a third capacitance value of a third battery capacity corresponding to at least one verification battery and the third battery capacity.

[0195] In some embodiments, the first testing module is used to test a first capacitance value of a battery to be tested, which may specifically include:

[0196] The second testing submodule is used to perform a swept frequency impedance test on the battery to be tested and obtain a swept frequency impedance test result of the battery to be tested.

[0197] The second determining submodule is used to determine the characteristic frequency value corresponding to the battery to be tested according to the swept frequency impedance test result of the battery to be tested.

[0198] The second testing submodule is further configured to perform a fixed-frequency impedance test on the battery to be tested at a characteristic frequency value corresponding to the battery to be tested, so as to obtain a first capacitance value of the battery to be tested.

[0199] The battery rapid capacity division device provided in the embodiment of the present application can achieve Figure 1 To avoid repetition, the various processes implemented in the method embodiment are not described here.

[0200] Figure 7 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application is shown.

[0201] The electronic device may include a processor 301 and a memory 302 storing computer program instructions.

[0202] Specifically, the processor 301 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0203] The memory 302 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 302 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 302 may include removable or non-removable (or fixed) media. Where appropriate, the memory 302 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 302 is a non-volatile solid-state memory.

[0204] The memory may include read-only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical or other physical / tangible memory storage devices. Thus, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to an aspect of the present disclosure.

[0205] The processor 301 reads and executes computer program instructions stored in the memory 302 to implement any one of the battery rapid capacity division methods in the above embodiments.

[0206] As an example, the electronic device may further include a communication interface 303 and a bus 310. Figure 3 As shown, the processor 301 , the memory 302 , and the communication interface 303 are connected via a bus 310 and communicate with each other.

[0207] The communication interface 303 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0208] Bus 310 includes hardware, software or both, and the components of battery rapid capacity distribution device are coupled to each other. For example, and not limitation, bus may include accelerated graphics port (AGP) or other graphics bus, enhanced industry standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industry standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnect (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 310 may include one or more buses. Although the present application embodiment describes and shows a specific bus, the application considers any suitable bus or interconnection.

[0209] The electronic device can execute the battery rapid capacity division method in the embodiment of the present application, thereby realizing the combination Figure 1 and Figure 6 Described is a method and device for rapid battery capacity division.

[0210] In addition, in conjunction with the battery rapid capacity division method in the above embodiments, embodiments of the present application may provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any of the battery rapid capacity division methods in the above embodiments is implemented.

[0211] An embodiment of the present application further provides a computer program product, including a computer program, which, when processed and executed, implements any one of the battery rapid capacity division methods in the above embodiments.

[0212] It should be understood that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated. Those skilled in the art can make various changes, modifications, and additions, or change the order of the steps after understanding the spirit of the present application.

[0213] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0214] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps. In other words, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0215] Aspects of the present disclosure have been described above with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit. It is also understood that each box in the block diagram and / or flowchart and the combination of the boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0216] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the scope of protection of the present application.

Claims

1. A method for rapid battery capacity division, characterized in that: include: Testing a first capacitance value of a battery to be tested; Determining a first battery capacity corresponding to the first capacitance value according to a predetermined correspondence between capacitance values and battery capacities; The first battery capacity is determined as the battery capacity of the battery to be tested.

2. The method according to claim 1, characterized in that Before determining the first battery capacity corresponding to the first capacitance value according to the predetermined correspondence between capacitance values and battery capacities, the method further includes: Obtaining a second battery capacity corresponding to each of the plurality of calibration batteries; Testing the second capacitance value of each calibration battery respectively; According to the second capacitance values and second battery capacities of the plurality of calibration batteries, a corresponding relationship between the capacitance values and the battery capacities is determined.

3. The method according to claim 2, characterized in that The testing of the second capacitance value of each calibration battery includes performing the following steps for each calibration battery: Performing a swept frequency impedance test on the calibration battery to obtain a swept frequency impedance test result of the calibration battery; Determining a characteristic frequency value corresponding to the calibration battery according to a swept frequency impedance test result of the calibration battery; At a characteristic frequency value corresponding to the calibration battery, a fixed-frequency impedance test is performed on the calibration battery to obtain a second capacitance value of the calibration battery.

4. The method according to claim 3, characterized in that The step of performing a swept frequency impedance test on the calibration battery to obtain a swept frequency impedance test result of the calibration battery; and determining a characteristic frequency value corresponding to the calibration battery according to the swept frequency impedance test result of the calibration battery, comprising: Performing a swept frequency impedance test on the calibration battery in a first frequency range to obtain a first swept frequency impedance test result; Determining a first frequency value according to the first swept-frequency impedance test result, where the first frequency value corresponds to a frequency value at a point where the absolute value of the imaginary part of the impedance is maximum in the first swept-frequency impedance test result; When the first frequency value is not within a second frequency range, the first frequency value is determined as a characteristic frequency value corresponding to the calibration battery, wherein the second frequency range is a preset boundary frequency range corresponding to the first frequency range.

5. The method according to claim 4, characterized in that After determining the first frequency value according to the first swept-frequency impedance test result, the method further includes: When the first frequency value is within the second frequency range, performing a swept frequency impedance test on the calibration battery within a third frequency range to obtain a second swept frequency impedance test result; Determining a second frequency value according to the second swept-frequency impedance test result, where the second frequency value corresponds to a frequency value corresponding to a point with a maximum absolute value of an imaginary part of the impedance in the second swept-frequency impedance test result; The second frequency value is determined as the characteristic frequency value corresponding to the calibration battery.

6. The method according to any one of claims 3 to 5, characterized in that The step of performing a fixed-frequency impedance test on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a second capacitance value of the calibration battery includes: Performing a fixed-frequency impedance test on the calibration battery at a characteristic frequency value corresponding to the calibration battery to obtain a fixed-frequency impedance test result; Determining the imaginary impedance value of the calibration battery according to the fixed-frequency impedance test result; Calculate the second capacitance value of the calibration battery according to Formula 1 based on the characteristic frequency value and the imaginary part value of the impedance corresponding to the calibration battery; In Formula 1, C represents the second capacitance value of the calibration battery; f represents the characteristic frequency value corresponding to the calibration battery; Z" represents the imaginary part of the impedance of the calibration battery.

7. The method according to any one of claims 2 to 5, characterized in that The determining, based on the second capacitance values and the second battery capacities of the plurality of calibration batteries, a corresponding relationship between the capacitance values and the battery capacities includes: Linear fitting is performed on the second capacitance values and the second battery capacities of the plurality of calibration batteries, thereby obtaining a corresponding relationship between the capacitance values and the battery capacities.

8. The method according to claim 2, characterized in that After determining the correspondence between the capacitance value and the battery capacity according to the second capacitance values and the second battery capacity of the plurality of calibration batteries, the method further includes: Obtaining a third battery capacity corresponding to at least one verification battery; Testing a third capacitance value of the verification battery; The correspondence between the capacitance value and the battery capacity is verified according to the third capacitance value of the third battery capacity corresponding to the at least one verification battery and the third battery capacity.

9. The method according to claim 1, characterized in that The testing of the first capacitance value of the battery to be tested includes: Performing a swept frequency impedance test on the battery to be tested to obtain a swept frequency impedance test result of the battery to be tested; Determining a characteristic frequency value corresponding to the battery to be tested according to a swept frequency impedance test result of the battery to be tested; A fixed-frequency impedance test is performed on the battery to be tested at a characteristic frequency value corresponding to the battery to be tested to obtain a first capacitance value of the battery to be tested.

10. A battery rapid capacity division device, characterized in that: include: A testing module, configured to test a first capacitance value of a battery to be tested; a determining module, configured to determine a first battery capacity corresponding to the first capacitance value according to a predetermined correspondence between capacitance values and battery capacities; The determining module is further configured to determine the first battery capacity as the battery capacity of the battery to be tested.

11. An electronic device, characterized in that: The device includes: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, the battery rapid capacity division method according to any one of claims 1 to 9 is implemented.

12. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the battery rapid capacity division method according to any one of claims 1 to 9 is implemented.

13. A computer program product, characterized in that When the instructions in the computer program product are executed by a processor of an electronic device, the electronic device executes the battery rapid capacity division method according to any one of claims 1 to 9.

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