Method and device for optimizing cutting position of positive electrode tab of battery and battery preparation method

Abstract

The invention provides a battery positive electrode tab cutting position optimization method and device and a battery preparation method, and belongs to the technical field of battery safety. The method comprises the following steps: acquiring structural design parameters of prepared different batteries and damage data after being impacted by a heavy object in different charge states; based on the multiple groups of structural design parameters and the corresponding damage data, constructing a cutting position optimization model; obtaining structural design parameters of the to-be-optimized battery; and taking the structural design parameters of the to-be-optimized battery as the input of the cutting position optimization model to obtain the cutting position of the positive tab of the to-be-optimized battery. According to the invention, the optimal cutting position of the positive pole lug of the battery is determined through the structural design parameters to produce and prepare the battery, so that the safety of the battery after being impacted by a heavy object can be effectively improved, and the temperature rise and explosion risk of the battery is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery safety technology, specifically to a method for optimizing the cutting position of the positive electrode tab of a battery, a device for optimizing the cutting position of the positive electrode tab of a battery, a battery manufacturing method, an electronic device, and a readable storage medium. Background Technology

[0002] In recent years, the field of new energy technology has seen rapid development, with rechargeable batteries receiving particular attention. Currently, the electrical performance of rechargeable batteries is highly sought after, with rapid progress in capacity, energy, and cycle life. However, along with the development of high-capacity, high-power batteries, safety issues have become increasingly apparent. For example, overcharging, over-discharging, short circuits, compression, impacts from heavy objects, heating, and punctures can lead to battery fires and explosions. Many factors affect battery safety, among which cell materials, manufacturing processes, battery design defects, and energy density play a decisive role.

[0003] Impact resistance plays a crucial role in the safety of cylindrical batteries, and many manufacturers have stringent requirements for this performance. Impact testing is a classic test for verifying cell safety, simulating the crushing and collisions that occur to cells or products during daily use. The localized indentations created by the cylindrical indenter in the impact test make cells more prone to failure. The sharper the indenter, the more concentrated the stress in the battery's core structure, leading to more severe core breakage, deformation, and displacement. Current technologies primarily focus on material thermal stability, such as adding various flame-retardant additives to the electrolyte and stabilizers to the slurry. These designs significantly affect the impact resistance, but also have a substantial impact on the battery's electrical performance, especially the cycle life of power batteries. Therefore, the mechanical structure design of cylindrical batteries is extremely important; mechanical protection can improve impact resistance without affecting the battery's electrical performance. Summary of the Invention

[0004] The purpose of this invention is to provide a method, apparatus, and battery preparation method for optimizing the cutting position of the positive electrode tab of a battery, so as to at least solve the problem that adding various flame retardant additives to the electrolyte and various stabilizers to the slurry has a significant impact on the effect of heavy impact, but also has a significant impact on the electrical performance of the battery, especially the cycle performance of power batteries.

[0005] To achieve the above objectives, a first aspect of the present invention provides an optimization of the cutting position of the positive electrode tab of a battery, comprising:

[0006] Obtain the structural design parameters of different prepared batteries and the damage data after being subjected to heavy impact under different states of charge.

[0007] Based on multiple sets of structural design parameters and corresponding damage data, a cutting position optimization model is constructed;

[0008] Obtain the structural design parameters of the battery to be optimized;

[0009] Use the structural design parameters of the battery to be optimized as the input of the cutting position optimization model to obtain the cutting position of the positive electrode tab of the battery to be optimized.

[0010] Optionally, the structural design parameters include: the outer diameter of the battery, the distance between the rolled-in positive electrode and the negative electrode head, the diameter of the winding needle, the thickness of the electrode group before the positive electrode is inserted, the thickness of the electrode group after the positive electrode is inserted, the thickness of the separator, the thickness of the negative electrode tab, and the thickness of the positive electrode tab.

[0011] Optionally, the damage data includes: the length of the torn area of the electrode tab after the battery is unfolded, the length of the wrinkled area of the electrode tab, and the length of the normal area of the electrode tab.

[0012] Optionally, the expression of the cutting position optimization model is:

[0013]

[0014] Where, L is the cutting position of the positive electrode tab of the battery; D is the outer diameter of the battery; α, k1, and k2 are all fitting coefficients, and k1 < k2; ΔL is the distance between the rolled-in positive electrode and the negative electrode head; r f is the diameter of the winding needle; t′ is the thickness of the electrode group before the positive electrode is inserted, and t′ = 2t 膜 + t 负 + e; t is the thickness of the electrode group after the positive electrode is inserted, and t = 2t 膜 + t 正 + t 负 + e; t 膜 is the thickness of the separator; t 负 is the thickness of the negative electrode tab; t 正 is the thickness of the positive electrode tab; e is the winding tension correction coefficient.

[0015] The second aspect of the present invention also provides a device for optimizing the cutting position of the positive electrode tab of a battery, and the device includes:

[0016] The first data acquisition module is used to acquire the structural design parameters of different batteries that have been prepared and the damage data after being impacted by heavy objects under different state of charge;

[0017] The model construction module is used to construct a cutting position optimization model based on the structural design parameters and damage data;

[0018] The second data acquisition module is used to acquire the structural parameters of the battery to be optimized;

[0019] A cutting position determination module, which is used to use the structural design parameters of the battery to be optimized as the input of the cutting position optimization model, and obtain the cutting position of the positive electrode tab of the battery.

[0020] Optionally, the structural design parameters include: the outer diameter of the battery, the distance between the head of the wound positive electrode and the negative electrode, the diameter of the winding needle, the thickness of the electrode group before the positive electrode enters the sheet, the thickness of the electrode group after the positive electrode enters the sheet, the thickness of the separator, the thickness of the negative electrode tab, and the thickness of the positive electrode tab;

[0021] The damage data includes: the length of the torn area of the electrode tab after the battery is unfolded, the length of the wrinkled area of the electrode tab, and the length of the normal area of the electrode tab.

[0022] Optionally, the expression of the cutting position optimization model is:

[0023]

[0024] Among them, L is the cutting position of the positive electrode tab of the battery; D is the outer diameter of the battery; α, k1, and k2 are all fitting coefficients, and k1 < k2; ΔL is the distance between the head of the wound positive electrode and the negative electrode; r f is the diameter of the winding needle; t′ is the thickness of the electrode group before the positive electrode enters the sheet, and t′ = 2t 膜 + t 负 + e; t is the thickness of the electrode group after the positive electrode enters the sheet, and t = 2t 膜 + t 正 + t 负 + e; t 膜 is the thickness of the separator; t 负 is the thickness of the negative electrode tab; t 正 is the thickness of the positive electrode tab; e is the winding tension correction coefficient.

[0025] The third aspect of the present invention also provides a battery manufacturing method, and the method includes:

[0026] Using the above battery positive electrode tab cutting position optimization method to optimize the cutting position of the battery positive electrode tab;

[0027] According to the optimized cutting position of the positive electrode tab, perform the cutting of the battery positive electrode tab.

[0028] The fourth aspect of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above battery positive electrode tab cutting position optimization method is implemented.

[0029] On the other hand, the present invention also provides a readable storage medium, on which instructions are stored, and the instructions are used to make a machine execute the above battery positive electrode tab cutting position optimization method.

[0030] This technical solution constructs a cutting position optimization model by using the battery's structural design parameters and damage data of the battery under different charging states after being subjected to heavy impact. Then, based on the structural design parameters of the battery to be optimized, the optimal cutting position of the positive electrode tab is determined to guide the battery production process. This can effectively improve the battery safety after heavy impact and reduce the risk of battery heating and explosion.

[0031] 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

[0032] 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:

[0033] Figure 1 This is a flowchart of the method for optimizing the cutting position of the positive electrode tab of a battery provided by the present invention;

[0034] Figure 2 This is a schematic diagram of the stress-induced damage analysis of the positive electrode sheet of the battery provided by the present invention;

[0035] Figure 3 This is a schematic diagram of the finite element analysis of the upper part of the tab of the cylindrical battery after winding, provided by the present invention.

[0036] Figure 4 This is a schematic diagram of the structure of the battery positive electrode tab cutting position optimization device provided by the present invention.

[0037] Explanation of reference numerals in the attached figures

[0038] 10 - First data acquisition module; 20 - Model building module;

[0039] 30 - Second data acquisition module; 40 - Cutting position determination module. Detailed Implementation

[0040] 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 present invention.

[0041] Figure 1 This is a flowchart of the method for optimizing the cutting position of the positive electrode tab of a battery provided by the present invention; Figure 2 This is a schematic diagram of the stress-induced damage analysis of the positive electrode sheet of the battery provided by the present invention; Figure 3 This is a schematic diagram of the finite element analysis of the upper part of the tab of the cylindrical battery after winding, provided by the present invention. Figure 4This is a schematic diagram of the structure of the battery positive electrode tab cutting position optimization device provided by the present invention.

[0042] like Figure 1 As shown, this invention provides a method for optimizing the cutting position of the positive electrode tab of a battery, the method comprising:

[0043] Step 1: Obtain the structural design parameters of different prepared batteries and the damage data after being subjected to heavy impact under different states of charge;

[0044] Step 2: Based on multiple sets of structural design parameters and corresponding damage data, construct a cutting position optimization model;

[0045] Step 3: Obtain the structural design parameters of the battery to be optimized;

[0046] Step 4: Use the structural design parameters of the battery to be optimized as input to the cutting position optimization model to obtain the cutting position of the battery positive electrode tab.

[0047] Specifically, in this embodiment, firstly, the structural design parameters of different pre-fabricated cylindrical batteries are obtained. Then, under different states of charge, multiple batteries undergo heavy object impact tests to obtain the normal electrode area after the impact, thereby designing the optimal positive electrode cutting position. The pre-fabricated batteries are subjected to heavy object impact tests, and then the batteries after the impact are disassembled to obtain the wrinkled area L1 and the length L2 of the normal area after unfolding the battery, as shown below. Figure 2 As shown, the positive electrode tab should be placed within the normal area of ​​the electrode sheet. To ensure safety from heavy impacts, the cutting position L of the positive electrode tab should be taken at the center of the normal area of ​​the electrode sheet, with the leftmost side of the unfolded battery as the starting point, i.e., the cutting position is... Finite element method for the upper part of the tab after the cylindrical battery is wound, such as Figure 3 The left image divides the ring into infinitesimally small parts, each of which is considered a rectangle with an area of ​​tdL, where L is the length of the wound material. The right image treats the ring as an infinitesimally narrow circle with an area of ​​2πrdr. Equating the areas on both sides, we can obtain:

[0048]

[0049] Based on the above basic model, it is applied to the actual winding process of a cylinder.

[0050] Based on computer simulations and battery disassembly following actual heavy impact tests, the center position L of the normal electrode area (which is also the initial design position of the cutting position) of a cylindrical battery after a heavy impact is related to the radial position of the cell. For an 18650 cylindrical battery, if the distance ΔL between the heads of the positive and negative electrodes is 40mm, and the diameter r of the winding needle is... fWhen it is 3.5 mm, a heavy object impact test is carried out. The cylindrical batteries at 0SOC, 50SOC and 100SOC are subjected to a heavy object impact. Then the battery is disassembled and the electrode sheet is unfolded. It is found that the lower the state of charge, the greater the damage to the electrode sheet, and the shorter the normal area of the electrode sheet after the heavy object impact. However, the central position of the normal area has no obvious change. Therefore, the cutting position should be set near the central position of the normal area of the electrode sheet at 0SOC. And based on the formula After data fitting, it is determined that the cutting position L under this test satisfies:

[0051]

[0052] It can be seen from this that by setting the cutting position at the L position, the damage to the electrode sheet after repeated impact is the smallest, and the battery is safer.

[0053] If the diameter of the winding needle r f and the distance △L between the head of the wound positive electrode and the negative electrode are parameterized, L is:

[0054]

[0055] If the diameter of the battery cell is not 18 mm, when the diameter changes, the diameter coefficient k is introduced, and L is:

[0056]

[0057] Among them, the diameter coefficient: D is the outer diameter of the battery. For example, for a 18650 battery, D = 18 mm; for a 21700 battery, D = 21 mm.

[0058] Furthermore, in this embodiment, the structural design parameters include: the outer diameter of the battery, the distance between the head of the wound positive electrode and the negative electrode, the diameter of the winding needle, the thickness of the electrode group before the positive electrode enters the sheet, the thickness of the electrode group after the positive electrode enters the sheet, the thickness of the separator, the thickness of the negative electrode sheet, and the thickness of the positive electrode sheet. The damage data includes: the length of the torn area of the electrode sheet after the battery is unfolded, the length of the wrinkled area of the electrode sheet, and the length of the normal area of the electrode sheet.

[0059] Specifically, the above structural design parameters and damage data are used for data fitting analysis. The data is comprehensive and can ensure the accuracy of model training.

[0060] Furthermore, in this embodiment, the expression of the cutting position optimization model is:

[0061]

[0062] Among them, L is the cutting position of the positive electrode tab of the battery; D is the outer diameter of the battery; α, k1, and k2 are all fitting coefficients, and k1 < k2; ΔL is the distance between the head of the wound positive electrode and the negative electrode; r ft is the diameter of the coil needle; t′ is the thickness of the electrode assembly before the positive electrode is inserted into the wafer, and t′=2t 膜 +t 负 +e; t is the thickness of the electrode assembly after the positive electrode is inserted into the wafer, and t = 2t 膜 +t 正 +t 负 +e;t 膜 t represents the diaphragm thickness. 负 The thickness of the negative electrode sheet; t 正 denoted as , where is the thickness of the positive electrode sheet; e is the winding tension correction coefficient. Where 0.003 ≤ e ≤ 0.006.

[0063] Specifically, by using the above calculation formula, the cutting position of the positive electrode tab of the battery can be determined quickly and accurately, providing guidance for the subsequent production and preparation of the battery. This can effectively improve the safety of the battery after heavy impact and reduce the risk of battery heating and explosion.

[0064] In another implementation, the above-mentioned training model method can be replaced by: training a neural network model based on structural design parameters including: the cutting position of the positive electrode tab, the outer diameter of the battery, the distance between the head of the positive electrode and the head of the negative electrode, the diameter of the winding needle, the thickness of the electrode group before the positive electrode is inserted, the thickness of the electrode group after the positive electrode is inserted, the thickness of the separator, the thickness of the negative electrode sheet, and the thickness of the positive electrode sheet; and damage data including: the length of the electrode sheet tearing area after the battery is unfolded, the length of the electrode sheet wrinkling area, and the length of the electrode sheet normal area, to obtain a cutting position optimization model.

[0065] The present invention also provides a device for optimizing the cutting position of the positive electrode tab of a battery, such as... Figure 4 As shown, the device includes:

[0066] The first data acquisition module 10 is used to acquire the structural design parameters of different batteries that have been prepared and the damage data after being impacted by heavy objects under different charging states.

[0067] Model building module 20 is used to build a cutting position optimization model based on the structural design parameters and damage data;

[0068] The second data acquisition module 30 is used to acquire the structural parameters of the battery to be optimized.

[0069] The cutting position determination module 40 is used to take the structural design parameters of the battery to be optimized as input to the cutting position optimization model to obtain the cutting position of the battery positive electrode tab.

[0070] Furthermore, in this embodiment, the structural design parameters include: the outer diameter of the battery, the distance between the heads of the positive and negative electrodes, the diameter of the winding needle, the thickness of the front electrode assembly before the positive electrode is inserted, the thickness of the rear electrode assembly after the positive electrode is inserted, the thickness of the separator, the thickness of the negative electrode sheet, and the thickness of the positive electrode sheet.

[0071] Further, in this embodiment, the damage data includes: the length of the pole piece rupture area after the battery is unfolded, the length of the pole piece wrinkling area, and the length of the normal area of the pole piece.

[0072] Further, in this embodiment, the expression of the cutting position optimization model is:

[0073]

[0074] Where L is the cutting position of the positive pole tab of the battery; D is the outer diameter of the battery; α, k1, and k2 are all fitting coefficients, and k1 < k2; ΔL is the distance between the involved positive pole and the head of the negative pole; r f is the diameter of the winding needle; t' is the thickness of the pole group before the positive pole enters the sheet, and t' = 2t 膜 + t 负 + e; t is the thickness of the pole group after the positive pole enters the sheet, and t = 2t 膜 + t 正 + t 负 + e; t 膜 is the thickness of the separator; t 负 is the thickness of the negative pole piece; t 正 is the thickness of the positive pole piece; e is the winding tension correction coefficient.

[0075] This embodiment of the present invention also provides a battery manufacturing method, and the method includes:

[0076] Using the above-mentioned battery positive pole tab cutting position optimization method to optimize the cutting position of the battery positive pole tab;

[0077] According to the optimized cutting position of the positive pole tab, cut the positive pole tab of the battery.

[0078] Specifically, in the actual production process, after the structure of the battery is designed according to the design requirements, since the cutting position of the positive pole tab will affect the safety of the battery itself, therefore, after determining the basic structure of the battery, use the above-mentioned battery positive pole tab cutting position optimization method to optimize the cutting position of the positive pole tab, obtain the optimal cutting position of the positive pole tab, and then cut the positive pole tab according to the determined cutting position of the positive pole tab; for the remaining battery manufacturing steps, existing mature steps can be used, which will not be elaborated here.

[0079] This embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, it implements the above-mentioned battery positive pole tab cutting position optimization method.

[0080] This invention also provides a readable storage medium storing instructions for causing a machine to execute the above-described method for optimizing the cutting position of the battery positive electrode tab.

[0081] Example 1:

[0082] The impact parameters of the cylindrical battery under heavy load were obtained, as shown in Table 1 below:

[0083] Table 1. Parameters of the first type of cylindrical battery

[0084]

[0085] Based on Comsol simulations and actual experiments, the tab cutting position L is:

[0086]

[0087] Wherein, diameter coefficient: Electrode thickness t′=2t 膜 +t 负 +e=0.274um. The calculation shows that the interval corresponding to the tab cutting position is 359mm≤L≤392mm. The cutting position of the battery used for comparison is 260mm. The cutting position obtained through this method is modified to 375mm.

[0088] Fifteen samples of batteries, both before and after optimization, were subjected to a heavy impact test at 100 SOC. A 15-meter diameter rod was placed horizontally in the center of the sample, and a 9.1-kilogram weight was dropped freely from a height of 610±25mm onto the top of the battery. The battery casing temperature was recorded within 6 hours after the test, and the occurrence of fire or explosion was recorded. The results are shown in Table 2 below.

[0089] Table 2. Statistical table of test results for the first type of cylindrical battery.

[0090]

[0091] The comparison before and after optimization shows that before optimization, 2 out of 15 batteries exploded and 4 heated up; after optimization, 0 out of 15 batteries exploded and 2 heated up. This indicates that the optimization has a significant effect, effectively improving battery safety after heavy impact and reducing the risk of battery heating up and explosion.

[0092] Example 2:

[0093] The impact parameters of the cylindrical battery under heavy load were obtained, as shown in Table 3 below:

[0094] Table 3. Parameters of the second type of cylindrical battery

[0095]

[0096]

[0097] Based on Comsol simulations and actual experiments, the tab cutting position L is:

[0098]

[0099] Wherein, diameter coefficient: Electrode thickness t′=2t 膜 +t 负 +e=0.261um Calculation yields: The interval corresponding to the tab cutting position is: 377mm≤L≤412mm. The battery cutting position used for comparison is 300mm. The cutting position obtained through this method is modified to 390mm.

[0100] Fifteen samples of batteries, both before and after optimization, were subjected to a heavy impact test at 100 SOC. A 15-meter diameter rod was placed horizontally in the center of the sample, and a 9.1-kilogram weight was dropped freely from a height of 610±25mm onto the top of the battery. The battery casing temperature was recorded within 6 hours after the test, and the occurrence of fire or explosion was recorded. The results are shown in Table 4 below.

[0101] Table 4. Statistical table of test results for the second type of cylindrical battery.

[0102]

[0103] The comparison before and after optimization shows that before optimization, 1 out of 15 batteries exploded and 5 batteries heated up to a relatively high temperature; after optimization, 0 batteries exploded and 3 batteries heated up to a relatively low temperature. This indicates that the optimization has a significant effect, effectively improving battery safety after impact from heavy objects and reducing the risk of battery heating up and explosion.

[0104] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0105] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy distinction and are not intended to limit the scope of protection of this invention.

[0106] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0107] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A method for optimizing the cutting position of the positive electrode tab of a battery, characterized in that, The method includes: Obtain the structural design parameters of different prepared batteries and the damage data after being subjected to heavy impact under different states of charge. Based on multiple sets of structural design parameters and corresponding damage data, a cutting position optimization model is constructed. Obtain the structural design parameters of the battery to be optimized; The structural design parameters of the battery to be optimized are used as input to the cutting position optimization model to obtain the cutting position of the positive electrode tab of the battery to be optimized.

2. The method for optimizing the cutting position of the positive electrode tab of a battery according to claim 1, characterized in that, The structural design parameters include: the outer diameter of the battery, the distance between the heads of the positive and negative electrodes, the diameter of the winding needle, the thickness of the electrode assembly before the positive electrode is inserted, the thickness of the electrode assembly after the positive electrode is inserted, the thickness of the separator, the thickness of the negative electrode sheet, and the thickness of the positive electrode sheet.

3. The method for optimizing the cutting position of the battery positive electrode tab according to claim 1, characterized in that, The damage data includes: the length of the electrode tearing area, the length of the electrode wrinkling area, and the length of the normal electrode area after the battery is unfolded.

4. The method for optimizing the cutting position of the battery positive electrode tab according to claim 1, characterized in that, The expression for the cutting position optimization model is: Among them, L is the cutting position of the positive electrode tab of the battery; D is the outer diameter of the battery; α, k1, and k2 are all fitting coefficients, and k1 < k2; ΔL is the distance between the rolled positive electrode and the head of the negative electrode; r f is the diameter of the winding needle; t' is the thickness of the electrode group before the positive electrode is inserted, and t' = 2t 膜 + t 负 + e; t is the thickness of the electrode group after the positive electrode is inserted, and t = 2t 膜 + t 正 + t 负 + e; t 膜 is the thickness of the separator; t 负 is the thickness of the negative electrode tab; t 正 is the thickness of the positive electrode tab; e is the winding tension correction coefficient.

5. A device for optimizing the cutting position of the positive electrode tab of a battery, characterized in that, The device includes: The first data acquisition module is used to acquire the structural design parameters of different batteries that have been fabricated, as well as the damage data after being subjected to heavy impact under different states of charge. The model building module is used to build a cutting position optimization model based on the structural design parameters and damage data; The second data acquisition module is used to acquire the structural parameters of the battery to be optimized. The cutting position determination module is used to take the structural design parameters of the battery to be optimized as input to the cutting position optimization model to obtain the cutting position of the battery positive electrode tab.

6. The battery positive electrode tab cutting position optimization device according to claim 5, characterized in that, The structural design parameters include: the outer diameter of the battery, the distance between the heads of the positive and negative electrodes, the diameter of the winding needle, the thickness of the front electrode assembly before the positive electrode is inserted, the thickness of the rear electrode assembly after the positive electrode is inserted, the thickness of the separator, the thickness of the negative electrode sheet, and the thickness of the positive electrode sheet. The damage data includes: the length of the electrode tearing area, the length of the electrode wrinkling area, and the length of the normal electrode area after the battery is unfolded.

7. The battery positive electrode tab cutting position optimization device according to claim 5, characterized in that, The expression for the cutting position optimization model is: Among them, L is the cutting position of the positive electrode tab of the battery; D is the outer diameter of the battery; α, k1, and k2 are all fitting coefficients, and k1 < k2; ΔL is the distance between the rolled positive electrode and the head of the negative electrode; r f is the diameter of the winding needle; t' is the thickness of the electrode group before the positive electrode is inserted, and t' = 2t 膜 + t 负 + e; t is the thickness of the electrode group after the positive electrode is inserted, and t = 2t 膜 + t 正 + t 负 + e; t 膜 is the thickness of the separator; t 负 is the thickness of the negative electrode tab; t 正 is the thickness of the positive electrode tab; e is the winding tension correction coefficient.

8. A method for preparing a battery, characterized in that, The method includes: The cutting position of the battery positive electrode tab is optimized using the method for optimizing the cutting position of the battery positive electrode tab according to any one of claims 1-4; Cut the positive electrode tab of the battery according to the optimized positive electrode tab cutting position.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for optimizing the cutting position of the battery positive electrode tab as described in any one of claims 1-4.

10. A readable storage medium, characterized in that, The readable storage medium stores instructions for causing a machine to perform the battery positive electrode tab cutting position optimization method according to any one of claims 1-4.

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