Battery cell preparation method, electronic equipment and storage medium

Abstract

The embodiment of the invention discloses a battery cell preparation method, electronic equipment and a storage medium. The battery cell preparation method comprises the following steps: acquiring a plurality of preset battery cell preparation schemes; under the same chemical system, constructing a sample cell corresponding to each cell preparation scheme; in the same battery cycle performance test environment, performing cycle test on each sample cell; the target scheme is constructed according to the test result and the multiple preset battery cell preparation schemes, and the battery cell is prepared based on the target scheme, so that the cycle performance of the battery cell can be improved while the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a method for preparing a battery cell, an electronic device, and a storage medium. Background Art

[0002] Lithium iron phosphate is a relatively stable material in the battery field, and the cycle performance of the battery cell is guaranteed. However, as the market requires longer life cycles for battery cells and battery packs, improving cycle performance is an urgent problem that needs to be solved.

[0003] To solve this problem, most manufacturers currently reduce the DC internal resistance of the battery cell to improve the mass transfer process of lithium ions, thereby optimizing the cycle performance. Among them, the measures taken include modifying the main materials of the positive and negative electrodes and optimizing the electrolyte, etc. However, from the perspective of materials, there are problems such as the difficulty of developing new materials and the lack of obvious optimization effects in optimizing cycle performance. Summary of the invention

[0004] The embodiments of the present application provide a method for preparing a battery cell, an electronic device, and a storage medium, which can improve the cycle performance of the battery cell while reducing the cost.

[0005] The present application provides a method for preparing a battery cell, comprising:

[0006] Get multiple preset battery cell preparation plans;

[0007] Under the same chemical system, construct sample cells corresponding to each cell preparation scheme;

[0008] Under the same battery cycle performance test environment, cycle tests are performed on each sample battery cell;

[0009] A target solution is constructed according to the test results and a plurality of preset battery cell preparation solutions, and battery cells are prepared based on the target solution.

[0010] Optionally, in some embodiments of the present application, constructing a target solution according to the test results and a plurality of preset battery cell preparation solutions, and preparing the battery cell based on the target solution includes:

[0011] Obtaining the capacity retention rate of the sample battery cell at each preset test number from the test results;

[0012] Constructing a target solution according to the capacity retention rate and a plurality of preset battery cell preparation solutions;

[0013] The battery cells are prepared based on the battery cell parameters corresponding to the target solution.

[0014] Optionally, in some embodiments of the present application, determining a target solution from a plurality of preset battery cell preparation solutions according to the capacity retention rate includes:

[0015] According to the capacity retention rate, calculating the capacity retention rate difference corresponding to the sample battery cell at different preset times;

[0016] A target solution is constructed based on the capacity retention rate difference and a plurality of preset battery cell preparation solutions.

[0017] Optionally, in some embodiments of the present application, constructing a target solution based on the capacity retention rate difference and a plurality of preset battery cell preparation solutions includes:

[0018] Determine, among the sample cells, a sample cell having the smallest capacity retention rate difference as a candidate cell;

[0019] Detecting whether the capacity retention rate difference corresponding to the candidate battery cell meets a preset condition;

[0020] If the capacity retention rate difference corresponding to the candidate battery cell meets a preset condition, the battery cell preparation scheme corresponding to the candidate battery cell is determined to be the target scheme.

[0021] Optionally, in some embodiments of the present application, it further includes:

[0022] If the capacity retention rate difference corresponding to the candidate battery cells does not meet the preset conditions, the battery cell thickness, battery cell width and battery cell column height of each sample battery cell are obtained;

[0023] A target solution is constructed based on the capacity retention rate difference corresponding to each of the sample cells and the obtained cell thickness, cell width and cell column height.

[0024] Optionally, in some embodiments of the present application, constructing a target solution according to the capacity retention rate difference corresponding to each of the sample cells and the obtained cell thickness, cell width, and cell column height includes:

[0025] Calculating the product of the cell thickness and the cell width, and determining the ratio of the product to the cell width as a first ratio, and;

[0026] Determine the ratio of the battery cell thickness to the battery cell column height as a second ratio;

[0027] Determining the high temperature performance parameters corresponding to each of the sample cells according to the first ratio and the second ratio;

[0028] The high temperature performance parameters are compared, and a target solution is constructed based on the comparison results.

[0029] Optionally, in some embodiments of the present application, within the range where the first ratio is greater than or equal to 32 and less than or equal to 46, and the second ratio is greater than or equal to 0.182 and less than or equal to 0.263, as the second ratio decreases, the battery cell cycle performance increases.

[0030] Optionally, in some embodiments of the present application, it further includes:

[0031] Prepare a reference battery cell corresponding to the target solution, and perform a cycle test on the reference battery cell;

[0032] Obtaining the capacity retention rate difference of the reference battery cell after the cycle test;

[0033] When the capacity retention rate difference corresponding to the reference battery cell meets the preset conditions, the battery cell is prepared based on the target solution.

[0034] Optionally, in some embodiments of the present application, the cycle test of each sample battery cell under the same battery cycle performance test environment includes:

[0035] Performing a cycle test on each sample battery cell at a first preset temperature, and;

[0036] At the second preset temperature, a cycle test is performed on each sample battery cell.

[0037] Correspondingly, the present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the steps of any of the above methods when executing the program.

[0038] The present application also provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0039] The embodiments of the present application provide a method for preparing a battery cell, an electronic device, and a storage medium. After obtaining multiple preset battery cell preparation schemes, sample batteries corresponding to each battery cell preparation scheme are constructed under the same chemical system. Then, each sample battery cell is subjected to a cycle test under the same battery cycle performance test environment. Finally, a target scheme is constructed based on the test results and multiple preset battery cell preparation schemes, and battery cells are prepared based on the target scheme. The battery cell preparation scheme provided in the present application performs a cycle test on each sample battery cell under the same battery cycle performance test environment. Finally, a target scheme is constructed based on the test results and multiple preset battery cell preparation schemes, and battery cells are prepared based on the target scheme. There is no need to develop new materials, which reduces the difficulty of battery cell preparation, and improves the cycle performance of the battery cell while reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 It is a schematic diagram of the process of preparing a battery cell provided in an embodiment of the present application;

[0042] Figure 2 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0044] Embodiments of the present application provide a method for preparing a battery cell, an electronic device, and a storage medium.

[0045] Among them, the battery cell preparation method can be specifically applied in a terminal, which may include a tablet computer or a personal computer (PC). The terminal can establish a wired or wireless connection with a server. The server may include an independently running server or a distributed server, or may include a server cluster composed of multiple servers.

[0046] It should be noted that the order of description of the following embodiments is not intended to limit the priority order of the embodiments.

[0047] A method for preparing a battery cell comprises: obtaining a plurality of preset battery cell preparation schemes; constructing a sample battery cell corresponding to each battery cell preparation scheme under the same chemical system; performing a cycle test on each sample battery cell under the same battery cycle performance test environment; constructing a target scheme according to the test results and the plurality of preset battery cell preparation schemes, and preparing the battery cell based on the target scheme.

[0048] See also Figure 1 , Figure 1 The schematic diagram of the process of preparing a battery cell provided in the embodiment of the present application. The specific process of the battery cell preparation method can be as follows:

[0049] 101. Obtain multiple preset battery cell preparation plans.

[0050] The cell preparation plan refers to a series of detailed steps and technical parameters used to guide the production and manufacturing process of the cell. It usually includes: material formulation, electrode sheet preparation and battery assembly, etc. The material formulation includes: the formulation and preparation of positive electrode materials, negative electrode materials, electrolytes and diaphragms. The positive electrode material is generally composed of lithium nickel cobalt manganese oxide (NCM) or lithium iron phosphate (LFP), etc., the negative electrode material often uses graphite, the electrolyte is a mixture of lithium salts and organic solvents, and the diaphragm is used to separate the positive and negative electrodes. The preparation of electrode sheets includes mixing, coating, rolling, slitting and other processes. Mixing is to highly disperse the battery active material and auxiliary materials in the solvent to form a high-viscosity fluid, coating is to evenly apply the slurry on the metal foil, rolling is to compact the electrode to the designed thickness, and slitting is to cut the electrode into the required width. Battery assembly includes winding or lamination, shell welding, injection and sealing. Lamination is the process of stacking multiple layers of positive and negative electrode sheets and separators into a battery core, and winding is the process of rolling the strip-shaped positive and negative electrode sheets and separators into a cylindrical winding core through a winding machine.

[0051] It should be noted that, in the embodiments of the present application, the battery cell preparation scheme also includes the size of the battery cell, such as the battery cell thickness, battery cell width and battery cell column height.

[0052] 102. Under the same chemical system, construct sample cells corresponding to each cell preparation scheme.

[0053] The chemical system refers to the core material combination that constitutes the electrochemical performance of the battery, including positive electrode materials, negative electrode materials, electrolytes and separators.

[0054] Building sample cells for each cell preparation scheme under the same chemical system means that all cells will use the same positive electrode material, negative electrode material, electrolyte and separator. The purpose of this is to ensure that the difference in cell performance mainly comes from the difference in cell size design, rather than due to changes in the chemical system.

[0055] For example, specifically, a positive electrode material (such as lithium iron LFP), a negative electrode material (such as graphite), an electrolyte and a separator are selected, and these materials are the same for all cells. According to the preset cell preparation scheme, the size parameters of each sample cell are determined, including the cell thickness (D), the cell width (L) and the cell column height (H). Positive and negative electrode sheets are prepared for each cell, including mixing positive and negative electrode materials with binders, conductive agents, etc., and then coated on metal foil (positive electrode is coated on aluminum foil, and negative electrode is coated on copper foil), followed by drying and compacting. According to the design size, the compacted positive and negative electrode sheets are cut into the desired shape and size. The positive and negative electrode sheets and the separator are stacked up, which can be in the form of winding or lamination to form the preliminary structure of the cell. The assembled cell is placed in a metal shell (such as a steel shell or an aluminum shell) or a plastic shell (such as an aluminum-plastic film) and sealed. The electrolyte is injected into the packaged cell. The cell after injection is charged for the first time to cause a chemical reaction inside it to form a stable SEI film. Conduct basic performance tests on the battery cells, such as capacity, internal resistance, open circuit voltage, etc., to ensure that the battery cells meet basic performance requirements. Mark each sample battery cell and record its preparation plan and key dimensional parameters for subsequent performance comparison and data analysis.

[0056] 103. Under the same battery cycle performance test environment, perform cycle tests on each sample battery cell.

[0057] Cycle testing is an important test in battery performance evaluation. It is used to simulate the charge and discharge cycle of the battery in actual use to evaluate the performance changes, life and reliability of the battery. For example, the cycle test of each sample battery cell under the same battery cycle performance test environment is to evaluate and compare the performance of different batteries under the same conditions. Specifically, determine the test environment parameters, including temperature (such as 25°C and 45°C), humidity, air pressure, etc., to ensure that all batteries are tested under the same environmental conditions. The current size of the charge and discharge within a specified time. For example, 1C means that the battery cell can be fully charged or discharged within 1 hour. Perform multiple charge and discharge cycles on each sample battery cell. One cycle usually includes charging from 0% to 100%, and then discharging from 100% to 0%. After each cycle, measure the remaining capacity of the battery cell to evaluate its capacity retention rate.

[0058] Optionally, in some embodiments of the present application, the step of “performing a cycle test on each sample battery cell under the same battery cycle performance test environment” may specifically include:

[0059] Performing a cycle test on each sample battery cell at a first preset temperature, and;

[0060] At the second preset temperature, a cycle test is performed on each sample battery cell.

[0061] Cycling the sample cells at two different preset temperatures is to evaluate the performance and life of the cells under different temperature conditions. This test can help determine the performance differences between the cells at high and normal temperatures.

[0062] The first preset temperature may be 25° C., and the second preset temperature may be 45° C. The specific selection may be made based on actual conditions, and details will not be elaborated herein.

[0063] 104. Construct a target solution based on the test results and multiple preset battery cell preparation solutions, and prepare the battery cell based on the target solution.

[0064] For example, summarize the cycle test results of all sample cells at different preset temperatures, including key performance indicators such as capacity retention, internal resistance change, and cycle life. Compare the performance data of different cell preparation solutions to determine which solutions perform best on specific performance indicators to identify the cell preparation solution with the best performance. Prepare the required positive electrode materials, negative electrode materials, electrolytes, and separators according to the chemical system of the target solution. Prepare the positive and negative electrode sheets according to the size parameters of the target solution, including mixing, coating, rolling, and slitting, and finally prepare the target cell.

[0065] Optionally, in some embodiments of the present application, the step of “constructing a target solution according to the test results and a plurality of preset battery cell preparation solutions, and preparing the battery cell based on the target solution” may specifically include:

[0066] Obtaining the capacity retention rate of the sample battery cell at each preset test number from the test results;

[0067] Build a target solution based on capacity retention and multiple preset battery cell preparation solutions;

[0068] The battery cells are prepared based on the battery cell parameters corresponding to the target solution.

[0069] The capacity retention rate refers to the ratio of the remaining capacity of a battery cell to its initial capacity after a certain number of charge and discharge cycles. Each sample battery cell is tested for a preset number of charge and discharge cycles, and the capacity after each cycle is recorded. Based on the performance data, the battery cell preparation scheme with the highest capacity retention rate and the best overall performance is selected as the target scheme. Finally, the battery cell is prepared according to the battery cell parameters corresponding to the target scheme.

[0070] Optionally, in some embodiments of the present application, the step of “constructing a target solution according to the capacity retention rate and a plurality of preset battery cell preparation solutions” may specifically include:

[0071] According to the capacity retention rate, calculate the capacity retention rate difference of the sample cells under different preset times;

[0072] The target solution is constructed based on the capacity retention rate difference and multiple preset battery cell preparation solutions.

[0073] The capacity retention rate difference refers to the difference between the capacity retention rates of the battery cells at different preset numbers of cycles. Specifically, several key cycle points can be determined, such as 2000 cycles, 4000 cycles, etc. For each sample battery cell, the capacity retention rate difference at different preset numbers of cycles is calculated. For example, the capacity retention rate difference after 2000 and 4000 cycles at 25°C is ΔP1; the capacity retention rate difference after 1000 and 2000 cycles at 45°C is ΔP2. According to the capacity retention rate difference, the battery cell preparation scheme with the best performance is selected as the target scheme. Generally, the smaller the capacity retention rate difference, the slower the performance decay of the battery cell during the cycle process. Optionally, when selecting the target scheme, material cost, feasibility of production process and economic benefits are considered at the same time.

[0074] Optionally, in some embodiments of the present application, the step of “constructing a target solution based on the capacity retention rate difference and a plurality of preset battery cell preparation solutions” may specifically include:

[0075] Determine the sample cell with the smallest capacity retention rate difference among the sample cells as the candidate cell;

[0076] Detect whether the capacity retention rate difference corresponding to the candidate battery cell meets the preset conditions;

[0077] If the capacity retention rate difference corresponding to the candidate battery cell meets the preset conditions, the battery cell preparation plan corresponding to the candidate battery cell is determined to be the target plan.

[0078] Among them, the conditions corresponding to the capacity retention rate difference can be set in advance according to application requirements and performance standards, that is, after a certain number of cycles, the battery cell capacity remains the allowable value of the reduction compared with the initial capacity. For example, after 2000 cycles, the capacity retention rate difference does not exceed 5%. This means that if the initial capacity of the battery cell is 100%, after 2000 charge and discharge cycles, its capacity should be maintained at least above 95%.

[0079] For example, specifically, a sample cell (i.e., a candidate cell) with the smallest capacity retention rate difference is determined from all sample cells. Then, it is detected whether the capacity retention rate difference of the candidate cell meets or exceeds a preset condition. If the capacity retention rate difference of the candidate cell meets the preset condition, the cell preparation scheme corresponding to the candidate cell is determined to be the target scheme.

[0080] If the capacity retention rate difference of the candidate battery cells does not meet the preset conditions, it may be necessary to optimize and adjust the battery cell preparation scheme and then retest. That is, optionally, in some embodiments of the present application, it may further include:

[0081] If the capacity retention rate difference corresponding to the candidate battery cell does not meet the preset conditions, the battery cell thickness, battery cell width and battery cell column height of each sample battery cell are obtained;

[0082] A target solution is constructed based on the capacity retention rate difference corresponding to each sample battery cell and the obtained battery cell thickness, battery cell width and battery cell column height.

[0083] For example, for each sample battery cell, measure and record its battery cell thickness, battery cell width and battery cell column height. Analyze the relationship between the capacity retention rate difference of the sample battery cells and their battery cell thickness, battery cell width and battery cell column height. Determine which dimensional parameters have the most significant impact on the capacity retention rate. Specifically, mathematical models or statistical methods can be used to predict the impact of different dimensional parameters on the capacity retention rate. According to the analysis results, adjust the dimensional parameters of the battery cell to optimize the capacity retention rate. Based on the optimized battery cell thickness, battery cell width and battery cell column height, construct a new target battery cell preparation plan.

[0084] Optionally, in some embodiments of the present application, the step of “constructing a target solution according to the capacity retention rate difference corresponding to each sample battery cell and the obtained battery cell thickness, battery cell width and battery cell column height” may specifically include:

[0085] Calculating the product of the cell thickness and the cell width, and determining the ratio of the product to the cell width as a first ratio, and;

[0086] Determine the ratio of the battery cell thickness to the battery cell column height as a second ratio;

[0087] Determining high temperature performance parameters corresponding to each sample battery cell according to the first ratio and the second ratio;

[0088] Calculate the product of the first ratio and the second ratio to obtain the high temperature performance parameter corresponding to each sample battery cell;

[0089] Compare various high-temperature performance parameters and build a target solution based on the comparison results.

[0090] For example, the cell thickness, cell width, and cell column height are recorded as D, L, and H (mm) respectively; and the dwarf S (i.e., the first ratio) is defined as (D*L) / H, then the Giraffe Index (i.e., high temperature performance parameter) is defined as K=D / H. Compare the high temperature performance parameters of each sample cell with the corresponding capacity retention rate difference to determine whether the first ratio, the second ratio, or the high temperature performance parameter has a greater impact on the capacity retention rate difference. If S has a greater impact on the capacity retention rate difference, consider increasing the cell width (L) or reducing the cell thickness (D). If K has the greatest impact on the capacity retention rate difference, consider adjusting the cell thickness (D), cell width (L), and cell column height (H). Based on the analysis results, determine the cell thickness (D), cell width (L), and cell column height (H) of the final target cell. Prepare a new cell sample based on the adjusted size parameters, and test it to verify whether the capacity retention rate meets the preset conditions. If the test results do not meet expectations, further adjust the cell design based on the test data, and then repeat the test until the requirements are met.

[0091] Optionally, in some embodiments of the present application, the following may be specifically included:

[0092] Prepare reference cells corresponding to the target solution and perform cycle tests on the reference cells;

[0093] Obtain the capacity retention rate difference of the reference battery cell after the cycle test;

[0094] When the capacity retention rate difference corresponding to the reference battery cell meets the preset conditions, the battery cell is prepared based on the target solution.

[0095] In order to facilitate further understanding of the solution of the present application, the following is an example of a specific application scenario. Specifically, the same chemical system (positive electrode: lithium iron; negative electrode: graphite) and the same electrolyte diaphragm are used to prepare four LFP lithium iron batteries with different heights, thicknesses and widths. The thickness, width and column height of the battery are recorded as D, L and H (mm) respectively; and the shortness S = (D*L) / H is defined, then the giraffe index is defined as K = D / H;

[0096] Solution 1: H: 195.5; D: 36.35; L: 130.3; then S1 = 24.2, K1 = 0.186;

[0097] Solution 2: H: 204.5; D: 33.25; L: 200.7; then S2 = 32.6, K2 = 0.162;

[0098] Solution 3: H: 204.7; D: 41.06; L: 173.9; then S3 = 34.9, K3 = 0.200;

[0099] Solution 4: H: 204.6; D: 53.85; L: 173.93; then S4 = 45.8, K4 = 0.263;

[0100] Take every two test cells of each solution to test the cycle performance (25℃, 45℃), and compare the capacity retention rate attenuation values ​​after the same number of cycles to judge the cycle performance;

[0101] The difference in capacity retention after 2000 and 4000 cycles at 25°C is recorded as ΔP1;

[0102] The difference in capacity retention after 1000 and 2000 cycles at 45°C is recorded as ΔP2;

[0103] Solution 1: ΔP1=9.28%, ΔP2=5.48%;

[0104] Solution 2: ΔP1=6.92%, ΔP2=4.98%;

[0105] Scheme 3: ΔP1=6.98%, ΔP2=6.71%;

[0106] Scheme 4: ΔP1=7.90%, ΔP2=6.81%;

[0107] Comparing the cycle data, we can see that the high temperature (45°C) cycle performance is: Scheme 2> Scheme 1> Scheme 3> Scheme 4; this is different from the relationship between the giraffe index of the four iron lithium batteries: K4>K3>K1>K2; but the normal temperature (25°C) cycle performance is Scheme 2>Scheme 3>Scheme 4>Scheme 1, which may be caused by the small stun of Scheme 1 (S4>S3>S2>S1). Therefore, the target scheme can be constructed based on the above results. It should be noted that when 32≤S≤46 and 0.182≤K≤0.263 are within the limited range, the smaller the giraffe index K, the better the battery cell cycle performance; but when the stun is too small, such as S<25, this indicates that the battery cell is designed too high relative to the capacity, which is not conducive to the normal temperature cycle performance of the battery cell.

[0108] The embodiment of the present application provides a method for preparing a battery cell. After obtaining multiple preset battery cell preparation schemes, sample batteries corresponding to each battery cell preparation scheme are constructed under the same chemical system. Then, cycle tests are performed on each sample battery cell under the same battery cycle performance test environment. Finally, a target scheme is constructed based on the test results and multiple preset battery cell preparation schemes, and battery cells are prepared based on the target scheme. The battery cell preparation scheme provided in the present application performs cycle tests on each sample battery cell under the same battery cycle performance test environment. Finally, a target scheme is constructed based on the test results and multiple preset battery cell preparation schemes, and battery cells are prepared based on the target scheme. There is no need to develop new materials, which reduces the difficulty of battery cell preparation, and improves the cycle performance of battery cells while reducing costs.

[0109] In addition, the present application also provides an electronic device, such as Figure 2 As shown, it shows a schematic diagram of the structure of the electronic device involved in the embodiment of the present application, specifically:

[0110] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will appreciate that Figure 2 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0111] The processor 301 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 301.

[0112] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and battery cell preparation by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0113] The electronic device also includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so that the power management system can manage charging, discharging, power consumption and other functions. The power supply 303 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators and other arbitrary components.

[0114] The electronic device may further include an input unit 304, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0115] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302, thereby realizing various functions, as follows:

[0116] Obtain multiple preset battery cell preparation schemes; construct sample batteries corresponding to each battery cell preparation scheme under the same chemical system; perform cycle tests on each sample battery cell under the same battery cycle performance test environment; construct a target scheme based on the test results and multiple preset battery cell preparation schemes, and prepare batteries based on the target scheme.

[0117] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0118] After obtaining multiple preset battery cell preparation schemes, the embodiment of the present application constructs sample batteries corresponding to each battery cell preparation scheme under the same chemical system, then performs cycle tests on each sample battery cell under the same battery cycle performance test environment, and finally, constructs a target scheme based on the test results and multiple preset battery cell preparation schemes, and prepares batteries based on the target scheme. The battery cell preparation scheme provided by the present application performs cycle tests on each sample battery cell under the same battery cycle performance test environment, and finally, constructs a target scheme based on the test results and multiple preset battery cell preparation schemes, and prepares batteries based on the target scheme, which does not require the development of new materials, reduces the difficulty of battery cell preparation, and improves the cycle performance of batteries while reducing costs.

[0119] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0120] To this end, an embodiment of the present application provides a storage medium in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any of the cell preparation methods provided in the embodiments of the present application. For example, the instructions can execute the following steps:

[0121] Obtain multiple preset battery cell preparation schemes; construct sample batteries corresponding to each battery cell preparation scheme under the same chemical system; perform cycle tests on each sample battery cell under the same battery cycle performance test environment; construct a target scheme based on the test results and multiple preset battery cell preparation schemes, and prepare batteries based on the target scheme.

[0122] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0123] The storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0124] Since the instructions stored in the storage medium can execute the steps in any one of the battery cell preparation methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the battery cell preparation methods provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0125] The above is a detailed introduction to a battery cell preparation method, an electronic device and a storage medium provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for preparing a battery cell, characterized in that: include: Get multiple preset battery cell preparation plans; Under the same chemical system, construct sample cells corresponding to each cell preparation scheme; Under the same battery cycle performance test environment, cycle tests are performed on each sample battery cell; A target solution is constructed according to the test results and a plurality of preset battery cell preparation solutions, and battery cells are prepared based on the target solution.

2. The method for preparing a battery cell according to claim 1, characterized in that: The target solution is constructed according to the test results and a plurality of preset battery cell preparation solutions, and the battery cell is prepared based on the target solution, including: Obtaining the capacity retention rate of the sample battery cell at each preset test number from the test results; Constructing a target solution according to the capacity retention rate and a plurality of preset battery cell preparation solutions; The battery cells are prepared based on the battery cell parameters corresponding to the target solution.

3. The method for preparing a battery cell according to claim 2, characterized in that: Determining a target solution from a plurality of preset battery cell preparation solutions according to the capacity retention rate includes: According to the capacity retention rate, calculating the capacity retention rate difference corresponding to the sample battery cell at different preset times; A target solution is constructed based on the capacity retention rate difference and a plurality of preset battery cell preparation solutions.

4. The method for preparing a battery cell according to claim 3, characterized in that: The target solution is constructed based on the capacity retention rate difference and a plurality of preset battery cell preparation solutions, including: Determine, among the sample cells, a sample cell having the smallest capacity retention rate difference as a candidate cell; Detecting whether the capacity retention rate difference corresponding to the candidate battery cell meets a preset condition; If the capacity retention rate difference corresponding to the candidate battery cell meets a preset condition, the battery cell preparation scheme corresponding to the candidate battery cell is determined to be the target scheme.

5. The method for preparing a battery cell according to claim 4, characterized in that: Also includes: If the capacity retention rate difference corresponding to the candidate battery cells does not meet the preset conditions, the battery cell thickness, battery cell width and battery cell column height of each sample battery cell are obtained; A target solution is constructed based on the capacity retention rate difference corresponding to each of the sample cells and the obtained cell thickness, cell width and cell column height.

6. The method for preparing a battery cell according to claim 5, characterized in that: The target solution is constructed according to the capacity retention rate difference corresponding to each of the sample cells and the obtained cell thickness, cell width and cell column height, including: Calculating the product of the cell thickness and the cell width, and determining the ratio of the product to the cell width as a first ratio, and; Determine the ratio of the battery cell thickness to the battery cell column height as a second ratio; Determining the high temperature performance parameters corresponding to each of the sample cells according to the first ratio and the second ratio; The high temperature performance parameters are compared, and a target solution is constructed based on the comparison results.

7. The method for preparing a battery cell according to claim 6, characterized in that: In the range where the first ratio is greater than or equal to 32 and less than or equal to 46, and the second ratio is greater than or equal to 0.182 and less than or equal to 0.263, as the second ratio decreases, the cycle performance of the battery cell increases.

8. The method for preparing a battery cell according to claim 5 or 6, characterized in that: Also includes: Prepare a reference battery cell corresponding to the target solution, and perform a cycle test on the reference battery cell; Obtaining the capacity retention rate difference of the reference battery cell after the cycle test; When the capacity retention rate difference corresponding to the reference battery cell meets the preset conditions, the battery cell is prepared based on the target solution.

9. The method for preparing a battery cell according to any one of claims 1 to 8, characterized in that: The cycle test is performed on each sample battery cell under the same battery cycle performance test environment, including: Performing a cycle test on each sample battery cell at a first preset temperature, and; At the second preset temperature, a cycle test is performed on each sample battery cell.

10. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the battery cell preparation method as described in any one of claims 1 to 9 are implemented.

11. A computer-readable storage medium, characterized in that: A computer program is stored thereon, wherein when the computer program is executed by a processor, the steps of the battery cell preparation method according to any one of claims 1 to 9 are implemented.

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