Battery cell cycle test method, control device, storage medium and system
By dividing the cyclic test period in the cell cycle test and plotting the non-polarization curve, the problem of irreversible loss caused by polarization phenomenon in the analysis of small current charge and discharge curves is solved, and the accuracy and reliability of cell performance analysis are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2026-03-10
AI Technical Summary
In existing cell cycle testing, the use of low-current charge-discharge curve analysis results in polarization, leading to a large proportion of irreversible losses and affecting the accuracy of the test results.
The cyclic charge-discharge test process of the battery cell is divided into multiple cyclic test cycles, and different discharge rates are performed in each cycle. A non-polarization curve is plotted, and thermodynamic losses are analyzed through the non-polarization curve. The ratio of thermodynamic and kinetic losses is calculated in combination with the capacity data.
Accurately plotting nonpolarization curves and thoroughly outputting irreversible losses improves the accuracy of cell cycle failure analysis and enables quantitative analysis of performance degradation mechanisms.
Smart Images
Figure CN121633875A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of battery testing, in particular to a method, a control device, a storage medium and a system for battery cycle testing. BACKGROUND
[0002] Lithium ion batteries, as green and environmentally friendly new energy batteries, have good reliability, high safety, small size and light weight, and have been widely used in digital products, electric vehicles, military products and other fields. In the use process of lithium ion batteries, there will inevitably be different degrees of attenuation, and accurate analysis of the irreversible loss reasons of the battery attenuation is crucial for the development of the battery.
[0003] Currently, for the irreversible output loss of the battery, most of the small current charge-discharge curves are used for comparative analysis, but the small current calibration curve still has polarization phenomenon (which can be understood as the phenomenon that when the battery has current passing through, the potential deviates from the equilibrium potential), especially in the small current calibration curve in the later stage of the battery cycle test, the proportion of irreversible loss is large, which will affect the accuracy of the test result analysis. SUMMARY
[0004] The purpose of the embodiments of the present application is to provide a method for battery cycle testing, which can solve the problem that the irreversible loss cannot be completely output in the battery cycle failure analysis process.
[0005] In order to achieve the above-mentioned purpose, the embodiments of the present application provide a method for battery cycle testing, characterized in that the method for battery cycle testing comprises: dividing the cycle charge-discharge test process of a test battery into a plurality of cycle test periods with a preset cycle test number K; in each cycle test period, after K cycles of cycle charge-discharge of the test battery, N cycles of cycle charge-discharge with different discharge rates are performed on the test battery, to obtain discharge curves corresponding to different discharge rates, wherein the discharge curve is a curve of the capacity and voltage of the test battery corresponding relationship, and based on the discharge curves corresponding to different discharge rates, a non-polarization curve corresponding to the cycle test period is drawn by using a preset non-polarization curve drawing method; and based on the non-polarization curve corresponding to each cycle test period, the thermodynamic loss of the test battery in the cycle test period is analyzed.
[0006] Optionally, after the step of dividing the cycle charge-discharge test process of the test battery into a plurality of cycle test periods, the method for battery cycle test further comprises: performing initial cycle charge-discharge of the test battery at N cycles of different discharge rates to obtain initial discharge curves corresponding to the different discharge rates; and drawing an initial non-polarization curve of the cycle charge-discharge test based on the initial discharge curves corresponding to the different discharge rates and the preset non-polarization curve drawing method.
[0007] Optionally, the step of performing cycle charge-discharge of the test battery at N cycles of different discharge rates to obtain discharge curves corresponding to the different discharge rates comprises: for each cycle of charge-discharge in the N cycles of cycle charge-discharge, discharging the test battery at a preset discharge rate to obtain a discharge curve corresponding to the discharge rate.
[0008] Optionally, the step of drawing a non-polarization curve corresponding to the cycle test period based on the discharge curves corresponding to the different discharge rates and the preset non-polarization curve drawing method comprises: selecting a plurality of capacity reference values; for each capacity reference value in the plurality of capacity reference values, obtaining a voltage corresponding to the capacity reference value from the discharge curves corresponding to the different discharge rates to obtain a discharge rate-voltage relationship curve corresponding to the capacity reference value; obtaining a target voltage corresponding to each capacity reference value based on the discharge rate-voltage relationship curve corresponding to the capacity reference value, the target voltage being a voltage corresponding to the capacity reference value when the discharge rate is 0C; and drawing the non-polarization curve corresponding to the cycle test period by using the each capacity reference value and the corresponding target voltage.
[0009] Optionally, the discharge rate-voltage relationship curve corresponding to each capacity reference value is a linear relationship, and the step of obtaining a target voltage corresponding to each capacity reference value based on the discharge rate-voltage relationship curve corresponding to the capacity reference value comprises: placing the discharge rate-voltage relationship curve corresponding to each capacity reference value in a plane coordinate system, wherein the abscissa represents the discharge rate and the ordinate represents the voltage; and extending the discharge rate-voltage relationship curve corresponding to each capacity reference value to a discharge rate of 0C to obtain the corresponding target voltage.
[0010] Optionally, after the step of obtaining discharge curves corresponding to different discharge rates, the method for battery cycle test further comprises: recording capacity data corresponding to the test battery at the end of each cycle test period.
[0011] Optionally, after analyzing the thermodynamic loss of the test cell in each cycle of the test, the method for cycle testing of the cell further includes: calculating the thermodynamic loss and kinetic loss in each cycle of the test based on the non-polarization curve and the capacity data; and obtaining the ratio of thermodynamic and kinetic losses in each cycle of the test based on the thermodynamic and kinetic losses in each cycle of the test, so as to analyze the mechanism and main influencing factors of performance degradation of the test cell during long-term use.
[0012] This invention also provides a control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the computer program to implement the above-described method for cell cycle testing.
[0013] An embodiment of the present invention provides a machine-readable storage medium storing instructions that cause a machine to perform the above-described method for cell cycle testing.
[0014] This invention provides a system for battery cell cycle testing, comprising a battery cell charging and discharging device for controlling the charging and discharging of the test battery cell and the aforementioned control device.
[0015] Through the above technical solution, in the embodiments of the present invention, when performing cyclic charge-discharge tests on the test cell, within each cyclic test cycle, the discharge curves corresponding to different discharge rates are used to plot the non-polarized curve corresponding to that cyclic test cycle using a preset non-polarized curve plotting method; and based on the non-polarized curve corresponding to each cyclic test cycle, the thermodynamic loss of the test cell in each cyclic test cycle is analyzed. The embodiments of the present invention, based on the non-polarized curve plotting method, can accurately plot the non-polarized curve corresponding to each cyclic test cycle and accurately analyze the thermodynamic loss of the test cell in each cyclic test cycle, so as to completely output irreversible losses during the cell cyclic failure analysis process and improve the accuracy of the analysis.
[0016] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description
[0017] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:
[0018] Figure 1This is a schematic flowchart of a method for battery cell cycle testing provided in an embodiment of the present invention;
[0019] Figure 2 This is a schematic diagram of the example discharge rate versus voltage curve; and
[0020] Figure 3 This is a schematic diagram illustrating different discharge rates and capacity curves, as well as polarization curves. Detailed Implementation
[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.
[0022] As mentioned above, most analyses of irreversible output losses in battery cells are conducted using low-current charge-discharge curves. However, even low-current calibration curves exhibit polarization, especially in the later stages of battery cycle testing, where a significant proportion of reversible losses exist, affecting the accuracy of test result analysis. Therefore, ensuring accurate output of non-polarization curves is a crucial issue that must be addressed during battery cell cycle testing.
[0023] Figure 1 This is a schematic flowchart of a method for cell cycle testing provided in an embodiment of the present invention. Please refer to it. Figure 1 The method for cell cycle testing may include the following steps:
[0024] Step S110: Divide the cyclic charge and discharge test process of the test cell into multiple cyclic test cycles using a preset number of cyclic test cycles K.
[0025] For example, the number of charge-discharge cycles K for testing the battery cell can be set according to its characteristics (e.g., design capacity, allowable charge-discharge cycles, etc.). For instance, setting K to 50 cycles, after performing 50 charge-discharge cycles at a certain discharge rate (which can be called the standard discharge rate, e.g., 1C), the battery cell is then subjected to, for example, N charge-discharge cycles to obtain test data. Thus, (K+N) charge-discharge cycles can be considered as one test cycle. In this way, the charge-discharge test process for the battery cell can be divided into multiple test cycles. Furthermore, before the first test cycle, the battery cell can be subjected to N charge-discharge cycles to obtain initial test data.
[0026] Step S120 (which may include steps S121-S122): Step S121, within each test cycle, after performing K cycles of charge and discharge on the test cell, perform N cycles of charge and discharge at different discharge rates to obtain discharge curves corresponding to different discharge rates. Step S122, based on the discharge curves corresponding to the different discharge rates, use a preset non-polarization curve plotting method to plot the non-polarization curve corresponding to that test cycle.
[0027] The discharge curve is a curve showing the relationship between the capacity and voltage of the test cell.
[0028] Preferably, in step S121, performing N cycles of charging and discharging at different discharge rates on the test cell to obtain discharge curves corresponding to different discharge rates includes: for each cycle of charging and discharging in the N cycles, discharging the test cell at a preset discharge rate to obtain the discharge curve corresponding to that discharge rate.
[0029] Taking any given test cycle as an example, using a cell charging and discharging device, the test cell is charged and discharged for K cycles at a discharge rate of, for example, 1C. Then, the test cell is charged and discharged at different discharge rates (e.g., 0.3C, 0.5C, 1C). One cycle of charging and discharging is performed at each discharge rate (N=3). This yields the discharge curve corresponding to each discharge rate, i.e., the curve showing the relationship between capacity and voltage at each discharge rate. It should be noted that the three discharge rates (0.3C, 0.5C, 1C) selected in the above example are only for illustrative purposes regarding this embodiment of the invention. In practice, more than three discharge rates can be selected to improve the accuracy of the discharge curve samples.
[0030] Preferably, after step S121, the method for cell cycle testing may further include: recording the capacity data of the test cell at the end of each cycle test period.
[0031] The capacity data at the end of each test cycle can be used to calculate the thermodynamic loss for each test cycle, which will be explained in detail later.
[0032] Preferably, step S122 may include: selecting multiple capacity reference values; for each of the multiple capacity reference values, obtaining the voltage corresponding to the capacity reference value from the discharge curves corresponding to different discharge rates to obtain the discharge rate versus voltage relationship curve corresponding to the capacity reference value; based on the discharge rate versus voltage relationship curve corresponding to each capacity reference value, obtaining the target voltage corresponding to each capacity reference value, wherein the target voltage is the voltage corresponding to each capacity reference value when the discharge rate is 0C; and plotting the polarization-free curve corresponding to the cyclic test cycle using each capacity reference value and the corresponding target voltage.
[0033] Continuing with the example above, select multiple capacity reference values, such as 0.5Ah, 0.75Ah, 1.0Ah, and 1.5Ah. Taking a capacity reference value of 1.0Ah as an example, the voltage corresponding to a capacity reference value of 1.0Ah can be obtained from the discharge curves corresponding to different discharge rates obtained above, and the relationship curve between discharge rate and voltage corresponding to this capacity reference value can be plotted. Similarly, discharge rate and voltage relationship curves corresponding to multiple capacity reference values can be obtained, such as... Figure 2 As shown, the horizontal axis represents the discharge rate (in units such as C), and the vertical axis represents the voltage (in units such as V).
[0034] Preferably, the discharge rate versus voltage curve corresponding to each capacity reference value is linear. Obtaining the target voltage corresponding to each capacity reference value based on the discharge rate versus voltage curve corresponding to each capacity reference value may include: placing the discharge rate versus voltage curve corresponding to each capacity reference value in a plane coordinate system, where the horizontal axis represents the discharge rate and the vertical axis represents the voltage; and extending the discharge rate versus voltage curve corresponding to each capacity reference value until the discharge rate is 0C to obtain the corresponding target voltage.
[0035] Following the example above, such as Figure 2 As shown, the discharge rate versus voltage curve can be fitted to a linear relationship. For each plotted capacity reference value, the discharge rate versus voltage curve is extended to the position where the discharge rate is 0C, using a linear fitting method, to obtain the corresponding target voltage. Figure 2 As shown, the intersection point (red dot) of each relationship curve with the vertical axis represents each capacity reference value and its corresponding target voltage. Using each capacity reference value and its corresponding target voltage, a polarization-free curve is plotted for that test cycle, as shown below. Figure 3As shown, the curve corresponding to EMF is the polarization-free curve for that test cycle, and Qmax represents the capacity data at the end of the test cycle corresponding to the polarization-free curve. This polarization-free curve can reflect the pure thermodynamic characteristics of the test cell in that test cycle, thus allowing us to obtain the thermodynamic loss for that test cycle.
[0036] Preferably, before step S120, the method for cell cycle testing may further include: performing N cycles of initial charge-discharge at different discharge rates on the test cell to obtain initial discharge curves corresponding to different discharge rates; and, based on the initial discharge curves corresponding to different discharge rates, plotting the initial non-polarized curve of the cycle charge-discharge test using the preset non-polarized curve plotting method.
[0037] As illustrated above, before the first cycle of the cyclic charge-discharge test on the test cell, similar to step S120, the test cell undergoes N initial cyclic charge-discharge cycles at different discharge rates to obtain initial discharge curves corresponding to different discharge rates. Based on these initial discharge curves, the initial non-polarization curve for the cyclic charge-discharge test is plotted using the aforementioned preset non-polarization curve plotting method. Furthermore, the capacity data of the test cell is recorded, typically representing the design capacity of the test cell, i.e., 100% capacity.
[0038] Step S130: Based on the non-polarization curve corresponding to each cycle of the test, analyze the thermodynamic loss of the test cell in each cycle of the test.
[0039] like Figure 3 As shown, the thermodynamic loss of the test cell in each test cycle can be analyzed based on the non-polarization curve corresponding to each test cycle, such as the magnitude of thermodynamic loss change.
[0040] This invention also enables quantitative analysis of thermodynamic and kinetic losses. Preferably, after step S130, the method for cell cycle testing may further include: calculating the thermodynamic and kinetic losses corresponding to each cycle test based on the non-polarization curve and the capacity data corresponding to each cycle test cycle; and obtaining the ratio of thermodynamic and kinetic losses corresponding to each cycle test cycle based on the thermodynamic and kinetic losses corresponding to each cycle test cycle, so as to analyze the mechanism and main influencing factors of performance degradation of the test cell during long-term use.
[0041] Following the example above, through step S120, the non-polarization curve corresponding to each test cycle can be plotted, and the non-polarization capacity data corresponding to the end of the current test cycle can be obtained. The difference between the non-polarization capacity data corresponding to the end of the previous test cycle (which can also be considered the start of the current test cycle) and the non-polarization capacity data corresponding to the end of the current test cycle (i.e., the difference in non-polarization capacity data before and after the current test cycle) is calculated; this difference is the thermodynamic loss of the current test cycle. Similarly, using the capacity data of the test cell corresponding to the end of each test cycle recorded above, the total loss corresponding to the current test cycle can be calculated. Next, the difference between the total loss and the thermodynamic loss corresponding to each test cycle is calculated, thus obtaining the kinetic loss corresponding to each test cycle. Furthermore, the ratio of thermodynamic to kinetic losses corresponding to each test cycle can be obtained, and the ratio of thermodynamic to kinetic losses corresponding to each test cycle can be visualized (e.g., displayed through a relationship curve) to analyze the mechanism and main influencing factors of performance degradation of the test cell during long-term use.
[0042] Accordingly, in this embodiment of the invention, during the cyclic charge-discharge test of the test cell, the discharge curves corresponding to different discharge rates obtained in each cyclic test cycle are used to plot the non-polarized curve corresponding to that cyclic test cycle using a preset non-polarized curve plotting method. Based on the non-polarized curve corresponding to each cyclic test cycle, the thermodynamic loss of the test cell in each cyclic test cycle is analyzed. This embodiment of the invention, based on the non-polarized curve plotting method, can accurately plot the non-polarized curve corresponding to each cyclic test cycle and accurately analyze the thermodynamic loss of the test cell in each cyclic test cycle, so as to completely output irreversible losses during the cell cyclic failure analysis process and improve the accuracy of the analysis. Furthermore, this embodiment of the invention can also quantitatively analyze thermodynamic and kinetic losses, so as to completely output irreversible losses during the cell cyclic failure analysis process and improve the accuracy of the analysis.
[0043] This invention also provides a control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the computer program to implement the above-described method for cell cycle testing.
[0044] An embodiment of the present invention provides a machine-readable storage medium storing instructions that cause a machine to perform the above-described method for cell cycle testing.
[0045] This invention provides a system for battery cell cycle testing, comprising a battery cell charging and discharging device for controlling the charging and discharging of the test battery cell and the aforementioned control device.
[0046] It should be noted that the technical implementation details and technical effects of the above-mentioned control device, machine-readable storage medium and system for cell cycle testing are similar to those of the above-mentioned method embodiment for cell cycle testing, and will not be repeated here.
[0047] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0048] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0049] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0050] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0051] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.
[0052] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.
[0053] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.
[0054] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0055] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. A method for cycling test of an electric cell, characterized in that, The method for battery cell cycle test comprises: The cycle charge-discharge test process of the test battery cell is divided into multiple cycle test periods with a preset cycle test number K; In each cycle test period, after K cycles of cycle charge-discharge of the test battery cell, N cycles of cycle charge-discharge with different discharge rates are performed on the test battery cell, so as to obtain discharge curves corresponding to different discharge rates, wherein the discharge curve is a curve of the capacity-voltage relationship of the test battery cell, Based on the discharge curves corresponding to different discharge rates, a non-polarization curve corresponding to the cycle test period is drawn by using a preset non-polarization curve drawing method; and Based on the non-polarization curves corresponding to each cycle test period, the thermodynamic loss of the test battery cell in each cycle test period is analyzed.
2. The method for cycling tests of battery cells according to claim 1, characterized in that, After the cycle charge-discharge test process of the test battery cell is divided into multiple cycle test periods, the method for battery cell cycle test further comprises: N cycles of initial cycle charge-discharge with different discharge rates are performed on the test battery cell, so as to obtain initial discharge curves corresponding to different discharge rates, Based on the initial discharge curves corresponding to different discharge rates, an initial non-polarization curve of the cycle charge-discharge test is drawn by using the preset non-polarization curve drawing method.
3. The method for cycling tests of battery cells of claim 1, wherein, The cycle charge-discharge with different discharge rates of the test battery cell to obtain the discharge curves corresponding to different discharge rates comprises: For each cycle of cycle charge-discharge, the test battery cell is discharged at a preset discharge rate to obtain a discharge curve corresponding to the discharge rate.
4. The method for cycling tests of battery cells of claim 1, wherein, The non-polarization curve corresponding to the cycle test period is drawn by using the preset non-polarization curve drawing method based on the discharge curves corresponding to different discharge rates, which comprises: A plurality of capacity reference values are selected; For each capacity reference value in the plurality of capacity reference values, a voltage corresponding to the capacity reference value is obtained from the discharge curves corresponding to different discharge rates, so as to obtain a discharge rate-voltage relationship curve corresponding to the capacity reference value; Based on the discharge rate-voltage relationship curve corresponding to each capacity reference value, a target voltage corresponding to each capacity reference value is obtained, which is a voltage corresponding to each capacity reference value when the discharge rate is 0C; and The non-polarization curve corresponding to the cycle test period is drawn by using each capacity reference value and the corresponding target voltage.
5. The method for cycling tests of battery cells according to claim 4, characterized in that, The discharge rate-voltage relationship curve corresponding to each capacity reference value is a linear relationship, and the target voltage corresponding to each capacity reference value is obtained based on the discharge rate-voltage relationship curve corresponding to each capacity reference value, which comprises: The discharge rate-voltage relationship curve corresponding to each capacity reference value is placed in a plane coordinate system, wherein the abscissa represents the discharge rate and the ordinate represents the voltage; and The discharge rate-voltage relationship curve corresponding to each capacity reference value is extended to the discharge rate of 0C, and the corresponding target voltage is obtained.
6. The method for electric cell cyclic testing of claim 1, wherein, After the discharge curves corresponding to different discharge rates are obtained, the method for battery cell cycle test further comprises: record the capacity data of the test battery cell at the end of each cycle test period.
7. The method for cycling tests of battery cells according to claim 6, characterized in that, After analyzing the thermodynamic loss of the test battery cell in each cycle test period, the method for battery cell cycle test further comprises: calculating the thermodynamic loss and kinetic loss of each cycle test period based on the corresponding non-polarization curve and the capacity data of each cycle test period; and based on the thermodynamic loss and kinetic loss of each cycle test period, obtaining the loss proportion of thermodynamics and kinetics of each cycle test period, to analyze the mechanism and main influencing factors of performance degradation of the test battery cell in the long-term use.
8. A control device characterized by comprising: The control device comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the processor executes the computer program to realize the method for battery cell cycle test according to any one of claims 1-7.
9. A machine-readable storage medium, characterized in that, The machine readable storage medium stores instructions which make the machine execute the method for battery cell cycle test according to any one of claims 1-7.
10. A system for cycle testing of an electric cell, characterized by The system for battery cell cycle test comprises a battery cell charging and discharging device for charging and discharging control of the test battery cell and the control device of claim 8.