Battery tab dislocation detection method, device and equipment, storage medium and product

Abstract

The invention discloses a battery tab dislocation detection method, device and equipment, a storage medium and a product, and relates to the field of battery preparation. The method comprises the steps that winding parameters used for winding a battery material are obtained, the winding parameters are used for indicating relevant parameters of winding of the battery material, and the battery material comprises a battery cell material; a material winding model is obtained, the material winding model is used for showing that the battery material forms a winding structure according to winding circular motion, and the winding circular motion is used for indicating the motion trail of the battery material in the winding process; based on the winding parameters and the material winding model, obtaining a tab dislocation result of the cell material, the tab dislocation result being used for indicating a tab offset between a tab winding position of the cell material and a reference tab position, and the reference tab position being used for providing a reference position for calibrating a tab of the cell material. According to the method, the tab dislocation result can be predicted by substituting the winding parameters into the model to simulate the battery material winding structure, and the experiment cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery preparation, and in particular to a method, device, equipment, storage medium and product for detecting battery tab misalignment. Background Art

[0002] Battery winding preparation is one of the key steps in the manufacturing process of lithium-ion batteries, which directly affects the performance, safety and life of the battery. In this process, the positive and negative electrode materials and the separator are alternately stacked and wound into a compact core structure. During the winding process, the tabs serve as the connection points between the electrodes and the external circuit, and their precise alignment is crucial to the overall performance of the battery.

[0003] In the related technology, the detection of the alignment of the tabs mainly relies on the traditional trial and error method. This method involves repeated adjustments to winding parameters such as the die-cutting size of the pole piece, the thickness of the pole piece, and the circumference of the winding needle, and a large number of actual battery cell winding experiments are conducted to evaluate the alignment of the tabs. In these experiments, operators usually rely on manual visual inspection or use simple measuring tools to detect the alignment of the tabs to determine whether the design requirements are met.

[0004] However, repeated experiments require consumption of large amounts of raw materials, including pole pieces and diaphragms, and also take up valuable equipment operating time and human resources, resulting in high production costs and low efficiency in pole lug detection. Summary of the invention

[0005] The embodiments of the present application provide a method, device, equipment, storage medium and product for detecting the misalignment of a battery tab, which can reduce the experimental cost during the tab detection process and improve the tab detection efficiency. The technical solution is as follows.

[0006] In one aspect, a method for detecting misalignment of a battery tab is provided, the method comprising:

[0007] Acquire winding parameters for winding battery materials, wherein the winding parameters are used to indicate relevant parameters of winding the battery materials, wherein the battery materials include battery core materials;

[0008] Acquire a material winding model, wherein the material winding model is a model for representing that the battery material forms a winding structure according to a winding circular motion, wherein the winding circular motion is used to indicate a movement trajectory of the battery material during the winding process;

[0009] The tab misalignment result of the battery cell material is obtained based on the winding parameters and the material winding model. The tab misalignment result is used to indicate the tab offset between the tab winding position of the battery cell material and the reference tab position. The reference tab position is used to provide a reference position for calibrating the tab of the battery cell material.

[0010] On the other hand, a battery tab misalignment detection device is provided, the device comprising:

[0011] An acquisition module, used for acquiring winding parameters for winding battery materials, wherein the winding parameters are used for indicating relevant parameters of the winding of the battery materials, wherein the battery materials include battery core materials;

[0012] The processing module is further used to obtain a material winding model, wherein the material winding model is a model for representing that the battery material forms a winding structure according to a winding circular motion, wherein the winding circular motion is used to indicate a movement trajectory of the battery material during the winding process;

[0013] The processing module is also used to obtain the tab misalignment result of the battery cell material based on the winding parameters and the material winding model, and the tab misalignment result is used to indicate the tab offset between the tab winding position of the battery cell material and the reference tab position, and the reference tab position is used to provide a reference position for calibrating the tab of the battery cell material.

[0014] In some embodiments, the processing module is further configured to:

[0015] Obtaining a reference tab spacing of the ith tab in the battery core material, where i≥2 and i is a positive integer, the reference tab spacing is used to indicate the material distance between the ith tab and the i-1th tab;

[0016] Acquire a first offset and a second offset corresponding to the ith tab based on the winding parameter and the material winding model, wherein the first offset is used to indicate a die-cutting spacing offset of the ith tab, and the second offset is used to indicate an offset between a tab spacing of the ith tab in the material winding model and a reference tab spacing;

[0017] Correcting the second offset by using the first offset and the winding parameter to obtain the tab spacing offset of the i-th tab;

[0018] The tab misalignment result is determined based on the tab spacing offsets respectively corresponding to a plurality of tabs in the battery core material.

[0019] In some embodiments, the battery material further includes a separator material;

[0020] The processing module is further used for:

[0021] Obtaining the circumference of a single winding circle in the winding circular motion;

[0022] Determining a diaphragm influence factor based on the thickness of the diaphragm material according to the winding circular motion, the diaphragm influence factor being used to indicate the degree of influence of the thickness of the diaphragm material on the winding circumference in the i-layer winding of the winding process;

[0023] Determining a cell influence factor based on the thickness of the cell material according to the winding circular motion, the cell influence factor being used to indicate the degree of influence of the thickness of the cell material on the winding circumference in the i-layer winding;

[0024] The reference tab spacing of the ith tab is determined based on the single-turn winding circumference, the separator influence factor, and the battery cell influence factor.

[0025] In some embodiments, the battery core material includes positive electrode material and negative electrode material;

[0026] The processing module is further used for:

[0027] Determining a negative electrode influence factor based on the thickness of the negative electrode material according to the winding circular motion, the negative electrode influence factor being used to indicate the degree of influence of the thickness of the negative electrode material on the winding circumference in the i-layer winding;

[0028] Determining a positive electrode influence factor based on the thickness of the positive electrode material according to the winding circular motion, wherein the positive electrode influence factor is used to indicate the degree of influence of the thickness of the positive electrode material on the winding circumference in the i-layer winding;

[0029] The cell influence factor is determined based on the negative electrode influence factor and the positive electrode influence factor.

[0030] In some embodiments, the battery material further includes a separator material;

[0031] The processing module is further used for:

[0032] Acquire a diaphragm deviation and a cell deviation based on the winding parameter and the material winding model, wherein the diaphragm deviation is used to indicate an offset of the distance between the tabs caused by a thickness deviation of the diaphragm material, and the cell deviation is used to indicate an offset of the distance between the tabs caused by a thickness deviation of the cell material;

[0033] Acquire a winding needle deviation based on a winding needle radius in the winding parameters and the material winding model, wherein the winding needle deviation is used to indicate an offset of the tab spacing caused by the winding needle radius;

[0034] The second offset is corrected by the first offset, the diaphragm deviation, the battery cell deviation and the winding needle deviation to obtain the tab spacing offset of the i-th tab.

[0035] In some embodiments, the acquisition module is further used to acquire the thickness of the separator material represented by the material winding model, and the thickness of the battery cell represented by the battery cell material in the material winding model;

[0036] The acquisition module is further used to acquire a reference diaphragm thickness of the diaphragm material in the winding parameters, and a reference cell thickness of the cell material;

[0037] The processing module is further configured to determine the diaphragm deviation for the i-th tab based on a difference between the diaphragm thickness and the reference diaphragm thickness and the material winding model;

[0038] The processing module is further used to determine the cell deviation for the i-th tab based on the difference between the cell thickness and the reference cell thickness and the material winding model.

[0039] In some embodiments, the battery core material includes positive electrode material and negative electrode material;

[0040] The processing module is further used for:

[0041] Determining a positive electrode tab misalignment result based on the positive electrode tab spacing offsets respectively corresponding to a plurality of positive electrode tabs in the positive electrode material;

[0042] The negative electrode tab misalignment result is determined based on the negative electrode tab spacing offsets respectively corresponding to the multiple negative electrode tabs in the negative electrode material.

[0043] In some embodiments, the processing module is further used to adjust the winding parameters based on the tab misalignment result to obtain reference winding parameters, and the reference winding parameters are used to indicate relevant parameters of the battery material winding obtained with the goal of calibrating the tab.

[0044] In some embodiments, the battery core material includes a positive electrode material and a negative electrode material, the positive electrode material includes a positive electrode tab, and the negative electrode material includes a negative electrode tab;

[0045] The processing module is further used for:

[0046] When the tab misalignment result indicates that the positive tab and the negative tab are misaligned at the same time, and the misalignment direction is a first direction, adjusting the winding parameter to obtain a first reference winding parameter, the first reference winding parameter is used to indicate at least one of increasing the thickness of the battery material, reducing the circumference of the winding needle, and reducing the die-cutting size, and the die-cutting size is used to indicate the size of the tab;

[0047] When the tab misalignment result indicates that the positive tab and the negative tab are misaligned at the same time and the misalignment direction is a second direction, the winding parameters are adjusted to obtain second reference winding parameters, and the second reference winding parameters are used to indicate at least one of reducing the thickness of the battery cell material, increasing the circumference of the winding needle, and increasing the die-cutting size, wherein the first direction is opposite to the second direction.

[0048] In some embodiments, the processing module is further used to automatically reacquire the tab misalignment result based on the reference winding parameters and the material winding model, and adjust the reference winding parameters based on the tab misalignment result until preset requirements are met.

[0049] In some embodiments, the processing module is further used to store the reference winding parameter as a candidate winding parameter in a candidate database when the preset requirement is met, wherein the candidate database includes a plurality of candidate winding parameters;

[0050] The acquisition module is further used to receive a first winding parameter input by a user;

[0051] The processing module is further used to display recommendation information when the first winding parameter matches a second candidate winding parameter among the multiple candidate winding parameters, wherein the recommendation information includes the second candidate winding parameter, a second pole lug misalignment result and a difference between the first winding parameter and the second candidate winding parameter, and the second pole lug misalignment result is a pole lug misalignment result corresponding to the second candidate winding parameter.

[0052] In some embodiments, the processing module is further configured to:

[0053] Displaying a first three-dimensional winding model through a virtual reality device, the first three-dimensional winding model is a three-dimensional model rendered based on the winding parameters and the material winding model, and the first three-dimensional winding model is used to express a three-dimensional winding structure of the battery material formed according to the winding circular motion based on the winding parameters;

[0054] receiving a simulation adjustment operation for the first three-dimensional winding model, wherein the simulation adjustment operation is used to instruct to adjust the three-dimensional winding structure of the battery material in the first three-dimensional winding model according to the reference winding parameters;

[0055] Based on the simulation adjustment operation, a second three-dimensional winding model is displayed. The second three-dimensional winding model is a three-dimensional model rendered based on the reference winding parameters and the material winding model. The second three-dimensional winding model is used to represent the three-dimensional winding structure of the battery material formed according to the winding circular motion based on the reference winding parameters.

[0056] On the other hand, a computer device is provided, comprising a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement a battery tab misalignment detection method as described in any of the above-mentioned embodiments of the present application.

[0057] On the other hand, a computer-readable storage medium is provided, in which at least one instruction, at least one program, a code set or an instruction set is stored, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to implement a battery tab misalignment detection method as described in any of the above-mentioned embodiments of the present application.

[0058] On the other hand, a computer program product or a computer program is provided, the computer program product or the computer program comprising computer instructions, the computer instructions being stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the battery tab misalignment detection method described in any of the above embodiments.

[0059] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0060] By obtaining a material winding model that can represent the winding structure of the battery material, the obtained winding parameters of the battery material can be substituted into the model to simulate the actual winding situation of the battery material, and then the simulated tab misalignment result can be obtained according to the winding parameters and the simulation situation of the material winding model to assist in calibrating the tab position. This can reduce the number of actual winding experiments in the tab misalignment detection process, reduce experimental costs, and improve tab detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0062] Figure 1 is a schematic diagram of a detection system provided by an exemplary embodiment of the present application;

[0063] Figure 2 is a flow chart of a battery tab misalignment detection method provided by an exemplary embodiment of the present application;

[0064] Figure 3is a schematic diagram of a winding structure of a battery material provided by an exemplary embodiment of the present application;

[0065] Figure 4 is a flow chart of a battery tab misalignment detection method provided by another exemplary embodiment of the present application;

[0066] Figure 5 is a flow chart of a tab calibration method provided by an exemplary embodiment of the present application;

[0067] Figure 6 is a structural block diagram of a battery tab misalignment detection device provided by an exemplary embodiment of the present application;

[0068] Figure 7 It is a structural block diagram of a terminal provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0069] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0070] First, a brief introduction is given to the terms involved in the embodiments of the present application.

[0071] Cylindrical cells: Most cylindrical cells (such as 18650, 21700) are spiral wound cells, which are widely used in portable electronic devices and electric vehicles. The design of cylindrical cells usually includes a cylindrical metal shell, which contains key components such as positive electrode materials, negative electrode materials, diaphragms, and electrolytes. Cylindrical cells are widely used in various electronic products due to their standardized size and reliable performance, such as laptops, digital cameras, portable tools, and an increasing number of electric vehicles and large energy storage systems.

[0072] Positive electrode material: During the discharge process of the battery, the positive electrode material provides lithium ions (or other charge carriers), and the lithium ions move to the negative electrode material through the electrolyte. During the charging process, the lithium ions return from the negative electrode material to the positive electrode material. Positive electrode materials generally have a high redox potential, which means that they can easily release and accept electrons. Common positive electrode materials in lithium-ion batteries include lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4), nickel cobalt aluminum oxide (NCA), etc.

[0073] Negative electrode materials: During the discharge process of the battery, the negative electrode material receives lithium ions from the positive electrode material and releases lithium ions back to the positive electrode material during the charging process. The negative electrode material needs to have a high lithium storage capacity and good conductivity. Negative electrode materials usually have a low redox potential, which allows them to easily embed and deintercalate lithium ions. Common negative electrode materials in lithium-ion batteries include graphite (such as artificial graphite, natural graphite), carbon-based materials, silicon-based materials, tin-based materials, lithium titanate (Li4Ti5O12), etc.

[0074] Battery separator: The battery separator is one of the key components of lithium-ion batteries. It is located between the positive and negative electrodes of the battery. Its main function is to prevent physical contact between the positive and negative electrodes, thereby avoiding short circuits, while allowing lithium ions to pass through and stably conduct lithium ions to complete the battery's charge and discharge cycle. Battery separators are usually a functional membrane material with a microporous structure, and the quality of its performance directly determines the overall performance of the battery. The materials of battery separators usually include polyolefins, such as polyethylene (PE) and polypropylene (PP), as well as microporous membranes prepared by dry or wet processes. In addition, there are composite separators that improve the thermal stability and safety of the separator by coating inorganic ceramic particles (such as alumina) on polyolefin-based membranes. New separator materials are also under continuous development, including fluoropolymers, cellulose, polyimide (PI), polyester (PET), etc.

[0075] In the related art, the detection of the alignment of the tabs mainly relies on the traditional trial and error method. This method involves repeated adjustments to the die-cutting size of the pole piece, the thickness of the pole piece, the circumference of the winding needle, and the winding parameters, and a large number of actual battery cell winding experiments are performed to evaluate the alignment of the tabs. In these experiments, operators usually rely on manual visual inspection or use simple measuring tools to detect the alignment of the tabs to determine whether the design requirements are met. However, since repeated experiments require the consumption of a large amount of raw materials, including pole pieces and diaphragms, and also take up valuable equipment operating time and human resources, resulting in high production costs and low efficiency in tab detection.

[0076] In the embodiment of the present application, the battery tab misalignment detection method is provided. By obtaining a mathematical model that can represent the winding structure of the battery material, the winding parameters of the obtained battery material can be substituted into the mathematical model (material winding model) to simulate the actual winding situation of the battery material. Then, according to the winding parameters and the simulation situation of the material winding model, the simulated tab misalignment result is obtained to assist in calibrating the tab position, which can reduce the number of actual winding experiments during the tab misalignment detection process, reduce the experimental cost, and improve the tab detection efficiency. The battery tab misalignment detection method proposed in the embodiment of the present application can be applied to various scenarios that support tab misalignment detection, such as the preparation scenario of battery cells, the component manufacturing scenario of electric vehicles, and the energy storage system construction scenario, etc., which are not limited herein.

[0077] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.) and signals involved in the present application are all authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards in the relevant regions. For example, the winding parameters and other contents involved in the present application are obtained under full authorization.

[0078] Secondly, the detection system involved in the embodiment of the present application is described. The battery tab misalignment detection method provided in the embodiment of the present application can be implemented by the terminal or the server alone, or can be implemented through data interaction between the terminal and the server (such as the server is responsible for processing the data sent by the terminal), and the embodiment of the present application does not limit this. Optionally, the battery tab misalignment detection method implemented by the terminal alone is taken as an example for description.

[0079] Schematically, please refer to Figure 1 , Figure 1 which is the detection system provided by an exemplary embodiment of the present application. As Figure 1 shown, the computer device 10 in the detection system is used to detect the tab misalignment situation after the battery material is wound.

[0080] The computer device 10 obtains the winding parameters for winding the battery material, and the winding parameters are used to indicate the relevant parameters of the battery material winding.

[0081] The above-mentioned battery material includes cell materials, and the cell materials can include at least one of a positive electrode material and a negative electrode material.

[0082] Winding parameters include but are not limited to battery material thickness, size, winding tension, winding needle circumference, number of layers of winding needle posting position, etc. Among them, the winding needle is a pre-set component used to participate in the battery material winding process, the winding needle circumference (or radius) is the corresponding size parameter of the winding needle, the number of layers of the winding needle posting position is the position relationship parameter of the winding needle and the battery material during the winding process, and the battery material, size and winding tension are material characteristic parameters of the battery material.

[0083] Optionally, the winding parameters may be input by a user through an input window provided by the computer device 10 , or may be automatically acquired by the computer device 10 , for example, by reading from a database.

[0084] Illustratively, the computer device 10 can display a detection interface, which is used to receive the winding parameters input by the user. The detection interface can be used to prompt the user the type of winding parameters that need to be input. After the user submits the input parameters based on the detection interface, if the input parameters submitted by the user do not cover all the winding parameters that need to be input, the computer device 10 can automatically read the corresponding parameters from the database to supplement the input parameters as the winding parameters. The computer device 10 can randomly read the winding parameters of the corresponding type from the database, or read the preset default winding parameters of the corresponding type, or read the winding parameters that match the parameters input by the user.

[0085] The computer device 10 obtains a material winding model for representing that the battery material forms a winding structure according to a winding circular motion. The model is a mathematical model for characterizing the winding structure.

[0086] The material winding model is constructed based on the winding circular motion, which is used to indicate the movement trajectory of the battery material during the winding process.

[0087] Optionally, the material winding model can be preset or constructed based on parameters input by the user. For example, the user can configure the parameters of the winding circular motion, and the computer device 10 can construct the material winding model based on the winding circular motion parameters configured by the user. This embodiment of the present application is not limited to this.

[0088] After obtaining the winding parameters and the material winding model, the computer device 10 obtains the tab misalignment result of the battery cell material based on the winding parameters and the material winding model. The tab misalignment result is used to indicate the tab offset between the tab winding position of the battery cell material and the reference tab position. The reference tab position is used to provide a reference position for calibrating the tab of the battery cell material.

[0089] The computer device 10 may include at least one of a terminal and a server.

[0090] Optionally, taking the implementation of data interaction between the terminal and the server as an example, the terminal can be used to receive winding parameters, send the winding parameters to the server, the server obtains the material winding model, and the server obtains the tab misalignment result of the battery cell material based on the winding parameters and the material winding model, and returns the tab misalignment result to the terminal for display or broadcast, etc.

[0091] It is worth noting that the above interaction methods are only illustrative examples and are not limited to this in the embodiments of the present application.

[0092] The above-mentioned terminal is optional. The terminal can be a desktop computer, a laptop computer, a mobile phone, a tablet computer, an e-book reader, a Moving Picture Experts Group Audio Layer III (MP3) player, a Moving Picture Experts Group Audio Layer IV (MP4) player, a smart TV, a smart car, and other forms of terminal devices, which are not limited to the embodiments of the present application.

[0093] It is worth noting that the above-mentioned servers can be independent physical servers, or they can be server clusters or distributed systems composed of multiple physical servers. They can also be cloud servers that provide basic cloud computing services such as cloud services, cloud security, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (CDN), as well as big data and artificial intelligence platforms.

[0094] In combination with the above-mentioned terminology introduction and detection system, the battery tab misalignment detection method provided by the embodiment of the present application is described. Figure 2 , which shows a flow chart of a battery tab misalignment detection method provided by an exemplary embodiment of the present application. The method can be executed by a terminal, or by a server, or by both a terminal and a server. The present application embodiment takes the method executed by a terminal as an example for explanation. Figure 2 As shown, the method comprises the following steps:

[0095] Step 210, obtaining winding parameters for winding battery materials.

[0096] The winding parameters are used to indicate the relevant parameters of the winding of battery materials, and the battery materials include the battery core materials.

[0097] Illustratively, the battery material is a material used for winding to obtain a core-wound battery. The battery material may include a battery core material and a separator material. The battery core material includes at least one of a positive electrode sheet and a negative electrode sheet.

[0098] In the process of winding battery materials, a winding needle is used. The winding needle is a component specially used for winding. It can assist in the winding process to ensure that battery materials such as positive electrode materials, negative electrode materials, and battery separators are accurately and efficiently wound into a tight battery cell.

[0099] A winding needle is usually a metal needle with a specific shape, which may be straight or curved. It is usually made of metal or high-strength material to ensure that it can withstand greater pressure and friction during the winding process. Therefore, the winding needle corresponds to the winding needle radius. The winding needle radius is the curvature radius of the winding needle, that is, the distance from the central axis of the winding needle to the battery winding surface. The winding needle radius usually affects the winding tightness of the battery material during the winding process, such as: under a smaller winding needle radius, the battery material has a larger curvature when winding, so the battery material will be subjected to greater stress, making the winding tighter; under a larger winding needle radius, the battery material has a smaller curvature when winding, so the battery material will be subjected to less stress, making the winding tighter, etc.

[0100] The winding parameters can be used to indicate the material properties of the battery material as well as the winding needle characteristics.

[0101] Indicatively, the winding parameters include, but are not limited to, pole piece thickness, diaphragm thickness, pole piece die-cutting size, winding tension, winding needle circumference, number of layers of winding needle pasting positions and other incoming material data.

[0102] Among them, the circumference of the winding needle (or radius, etc.) and the number of layers of the winding needle pasting position are the characteristic parameters of the winding needle, the electrode thickness, diaphragm thickness, electrode die-cutting size, winding tension, etc. are the characteristic parameters of the battery materials, the circumference of the winding needle is the corresponding size parameter of the winding needle, and the number of layers of the winding needle pasting position is used to indicate the positional relationship between the winding needle and the battery material during the winding process.

[0103] Optionally, the winding parameters may be preset, input by a user, or obtained by testing actual battery materials, which is not limited in the embodiments of the present application.

[0104] Step 220, obtaining a material winding model.

[0105] The material winding model is a mathematical model used to represent the winding structure formed by the battery material according to the winding circular motion. The winding circular motion is used to indicate the movement trajectory of the battery material during the winding process.

[0106] Optionally, the material winding model may be pre-configured or constructed in real time based on the winding circular motion parameters, which is not limited in the embodiments of the present application.

[0107] Among them, the winding circular motion parameters are parameters used to indicate the winding trajectory, for example, the number of winding turns, the winding straight line length, the winding circular radius, etc., which can indicate the movement trajectory of the battery material during the winding process.

[0108] The battery materials used in the process of winding to prepare finished materials usually include positive electrode sheets, negative electrode sheets, battery separators, etc.; such as: winding the battery materials in the manner of "positive electrode sheet - battery separator - negative electrode sheet - battery separator - positive electrode sheet..."; or, winding the battery materials in the manner of "positive electrode sheet - battery separator - positive electrode sheet...", or, winding the battery materials in the manner of "negative electrode sheet - battery separator - negative electrode sheet...", etc. It is worth noting that the above-mentioned interval winding method of battery materials is only an illustrative example, and the embodiments of the present application do not limit this.

[0109] Among them, the battery separator, as a battery material that isolates the electrode material, has the function of ensuring the safety of finished product preparation and use; the battery separator can be provided by separator rolls, and the length of each separator roll is usually relatively long, such as 50 meters to 500 meters; in addition, the width of the separator roll, that is, the separator width, is approximately between 100 mm and 600 mm. The common battery separators have a separator width of 160 mm, 210 mm, 300 mm, etc., which is not limited here.

[0110] The material winding model can be used to indicate the winding structure of battery materials, including material spacing, winding trajectory, etc.

[0111] For illustration, please refer to Figure 3 , Figure 3 The winding structure diagram of the battery material provided by an exemplary embodiment of the present application is used to indicate that the battery material is formed in a circular motion as shown in FIG. Figure 3 The winding structure 300 shown, wherein the battery material is wound in an interval manner of “negative electrode—diaphragm—positive electrode—diaphragm…”, and the battery material is wound in a circular motion as shown in the winding structure 300, wherein the winding straight line length is W, the winding circle radius is r0, and the tab misalignment amount is △H.

[0112] In some embodiments, the material winding model is automatically constructed based on the winding parameters through artificial intelligence (AI), and the AI ​​is trained based on sample winding parameters and sample winding structures, wherein the sample winding parameters are the design parameters used in the battery preparation scenario, and the sample winding structure is the actual winding structure obtained by winding the battery material based on the design parameters in the battery preparation scenario.

[0113] Based on sample winding parameters and sample winding structures, AI can be trained to obtain the ability to simulate winding structures based on winding parameters, thereby building a material winding model through AI, so that the winding structure shown in the material winding model can simulate the actual winding structure, such as considering factors such as winding tension and die-cutting errors.

[0114] Step 230, obtaining the tab misalignment result of the battery cell material based on the winding parameters and the material winding model.

[0115] The tab misalignment result is used to indicate the tab offset between the tab winding position of the battery cell material and the reference tab position, and the reference tab position is used to provide a reference position for calibrating the tab of the battery cell material.

[0116] By substituting the winding parameters into the material winding model, the reference lug spacing and the first offset corresponding to the multiple lugs after the battery material is wound can be obtained. The reference lug spacing is used to indicate the material distance between the lug and the lug in the previous layer of winding, and the first offset is used to indicate the die-cutting spacing offset of the lug; based on the reference lug spacing, the second offset can be obtained, and the second offset is used to indicate the offset between the lug spacing of the lugs in the material winding model and the reference lug spacing, so that the second offset can be corrected by the first offset and the winding parameters to obtain the lug spacing offset of the lugs.

[0117] The above-mentioned reference tab spacing refers to the standard tab spacing after the battery material is wound in a circular motion under ideal conditions. When the winding parameters are substituted into the material winding model, due to the consideration of the influence of winding tension, there is an offset between the tab spacing shown in the material winding model and the reference tab spacing. Therefore, the second offset can be determined based on the tab spacing shown in the material winding model and the reference tab spacing. Due to factors such as die-cutting errors, the actual die-cutting size of the battery material may have an error with the die-cutting size in the designed winding parameters. The actual winding structure of the battery material may have a tab spacing offset caused by die-cutting errors. Therefore, the first offset can be obtained based on the winding parameters and the material winding model, and the second offset can be corrected by the first offset and the winding parameters, so that the tab spacing offset of the battery cell material can be accurately simulated.

[0118] Schematically, a reference lug spacing of the ith lug in the battery cell material is obtained, and the reference lug spacing is used to indicate the material distance between the ith lug and the i-1th lug; a first offset and a second offset corresponding to the ith lug are obtained based on the winding parameters and the material winding model, and the first offset is used to indicate the die-cutting spacing offset of the ith lug, and the second offset is used to indicate the offset between the lug spacing of the ith lug in the material winding model and the reference lug spacing; the second offset is corrected by the first offset and the winding parameters to obtain the lug spacing offset of the ith lug; and the lug misalignment result is determined based on the lug spacing offsets corresponding to the plurality of lugs in the battery cell material.

[0119] Under ideal conditions, the tab spacing between adjacent tabs is the reference tab spacing, and the tab spacing offset obtained by correcting the second offset through the first offset and the winding parameter is the offset between the tab spacing between adjacent tabs and the reference tab spacing in the actual winding structure of the battery material, wherein the tab spacing corresponding to each layer of tabs (starting from the second layer) in the actual winding structure of the battery material may be offset from the reference tab spacing, and when aligning the tabs, the tab position of the first tab is usually used as the reference position. Therefore, when detecting the misalignment of the tabs, it is necessary to determine the misalignment of each tab compared to the i-th tab, and it is necessary to accumulate the tab spacing offsets of the first i tabs (starting from the second).

[0120] Schematically, the reference tab position is usually the tab position of the first tab of the first layer of battery material during the winding process. For the ith tab, the tab misalignment result of the ith tab can be determined based on the tab spacing offsets corresponding to the second to i tabs in the battery cell material, respectively. i ≥ 2 and i is a positive integer. The tab misalignment result of the ith tab is the sum of the tab spacing offsets between the second to i tabs and the first tab.

[0121] To summarize, the method provided in the embodiments of the present application, by obtaining a mathematical model that can represent the winding structure of the battery material, can substitute the obtained winding parameters of the battery material into the mathematical model (material winding model) to simulate the actual winding conditions of the battery material, thereby obtaining the simulated tab misalignment results according to the winding parameters and the simulation conditions of the material winding model, to assist in calibrating the tab position, which can reduce the number of actual winding experiments in the tab misalignment detection process, reduce experimental costs, and improve tab detection efficiency.

[0122] In some embodiments, by obtaining the tab spacing offset of the tabs, the tab misalignment results of the tabs are accumulated. Figure 4, which shows a flow chart of a battery tab misalignment detection method provided by another exemplary embodiment of the present application. The method can be executed by a terminal, or by a server, or by both a terminal and a server. The present application embodiment takes the method executed by a terminal as an example for explanation. Figure 4 As shown, the above step 230 includes the following steps:

[0123] Step 231, obtaining a reference tab spacing of the i-th tab in the battery cell material, where i≥2 and i is a positive integer.

[0124] The reference tab spacing is used to indicate the material distance between the ith tab and the (i-1)th tab.

[0125] The i-th pole ear refers to the pole ear that is wound in the i-th layer from the inside to the outside when the battery cell material is wound around the winding needle.

[0126] When the battery cell materials include positive electrode materials and negative electrode materials, it is necessary to obtain the reference tab spacing of the i-th positive electrode tab and the reference tab spacing of the i-th negative electrode tab respectively. The reference tab spacing of the i-th positive electrode tab refers to the theoretical distance between adjacent positive electrode tabs in the winding structure, and the reference tab spacing of the i-th negative electrode tab refers to the theoretical distance between adjacent negative electrode tabs.

[0127] Without considering the material thickness, the tab spacing between adjacent tabs is the circumference of a single circle of winding circular motion. Since the battery material has thickness, the tab spacing will increase. The reference tab spacing is the tab spacing under ideal conditions that is only affected by the thickness of the battery material. Therefore, the reference tab spacing can be obtained based on the circumference of a single circle of winding circular motion and the thickness of the battery material.

[0128] During the winding process of lithium batteries, the alignment of the tabs is one of the key factors affecting battery performance. The reference tab spacing refers to the theoretical distance between the ith tab and the i-1th tab. This distance is usually pre-set based on battery design specifications and process requirements.

[0129] Optionally, the reference tab spacing can be obtained by at least one of the following methods: obtaining the theoretical spacing between the tabs based on the battery design drawings or process documents; determining the average value or standard value of the tab spacing by analyzing historical production data; calculating the spacing between the tabs under ideal conditions based on the material winding model, etc.

[0130] By obtaining the reference tab spacing, a benchmark value can be provided for subsequent offset calculations to determine whether the tabs are misaligned.

[0131] Schematically, taking the calculation of the reference tab spacing based on the material winding model as an example, the process of obtaining the reference tab spacing includes the following steps:

[0132] first step , obtain the single-turn winding circumference of the winding circular motion.

[0133] The single-turn winding circumference refers to the winding circumference of the battery material when the battery material is wound in one turn in a winding circular motion when the thickness of the battery material is ignored.

[0134] The circumference of a single turn of winding needs to be determined based on the winding trajectory of the winding circular motion.

[0135] Indicatively, Figure 3 Taking the winding circular motion shown as an example, the length of the straight line segment in the winding trajectory is W, and the radius of the circular trajectory is r0, then the circumference of a single turn of winding is 2W+2πr0.

[0136] It is worth noting that the above-mentioned calculation method of the single-turn winding circumference is only an illustrative example. A variety of single-turn winding circumferences can be determined according to the winding trajectories of different winding movements, and the embodiments of the present application are not limited to this.

[0137] Step 2 , the diaphragm influence factor is determined based on the thickness of the diaphragm material according to the winding circular motion.

[0138] The diaphragm influence factor is used to indicate the degree of influence of the thickness of the diaphragm material on the winding circumference in the i-layer winding process.

[0139] When determining the diaphragm influencing factor, it is first necessary to obtain the thickness of the diaphragm material, and secondly, it is necessary to determine the degree of influence of the thickness on the winding circumference based on the winding structure indicated by the material winding model.

[0140] Indicatively, Figure 3 In the winding structure shown, there are two layers of separator material between each winding of the battery cell material. Therefore, it is necessary to consider the influence of the thickness of the two layers of separator material on the actual winding circumference of one winding. Among them, in the circular trajectory part of the winding circular motion, the thickness of the two layers of separator material will increase the winding length of the battery material in this trajectory part.

[0141] Step 3 , the cell impact factor is determined based on the thickness of the cell material and the winding circular motion.

[0142] The cell impact factor is used to indicate the degree of influence of the thickness of the cell material on the winding circumference in the i-layer winding.

[0143] When determining the cell influencing factor, it is first necessary to obtain the thickness of the cell material, and secondly, it is necessary to determine the degree of influence of the thickness on the winding circumference based on the winding structure indicated by the material winding model.

[0144] Optionally, the battery core material includes at least one of a positive electrode material and a negative electrode material. Figure 3The winding structure shown is used as an example for explanation. The battery cell material includes positive electrode material and negative electrode material. When determining the battery cell influence factor, it is necessary to determine the positive electrode influence factor and the negative electrode influence factor.

[0145] Schematically, the negative electrode influence factor is determined based on the thickness of the negative electrode material according to the winding circular motion; the positive electrode influence factor is determined based on the thickness of the positive electrode material according to the winding circular motion; the battery cell influence factor is determined based on the negative electrode influence factor and the positive electrode influence factor. Among them, the negative electrode influence factor is used to indicate the degree of influence of the thickness of the negative electrode material on the winding circumference in the i-layer winding, and the positive electrode influence factor is used to indicate the degree of influence of the thickness of the positive electrode material on the winding circumference in the i-layer winding.

[0146] Indicatively, Figure 3 Taking the winding structure shown in the figure as an example, since the separator appears in pairs in the winding structure (one layer for each positive electrode and negative electrode), the influence factor is 4i-2 (considering the influence of no separator in front of the first negative electrode ear). Figure 3 The geometric relationship of the winding structure shown in the figure shows that the actual position of the negative electrode tab will move outward by π×T with each additional layer of separator. s Therefore, the diaphragm influence factor of the i-th negative electrode tab is (4i-2)×π×T s , where T s is the actual thickness of the diaphragm; due to the spacing method of "negative electrode-diaphragm-positive electrode-diaphragm-negative electrode...", it is necessary to consider the thickness influence of a group of negative electrodes and positive electrodes, and the influence factor is 2i-3 (considering the influence of no diaphragm in front of the first negative electrode ear). Figure 3 The geometric relationship of the winding structure shown in the figure shows that the actual position of the negative electrode tab will move outward by π×(T a +T c ), therefore, the diaphragm influence factor of the i-th negative electrode tab is (2i-3)×π×(T a +T c ), where T a is the actual thickness of the positive electrode sheet, T c is the actual thickness of the negative electrode sheet.

[0147] Similarly, for the i-th positive electrode tab, since the separators appear in pairs in the winding structure (one layer each for the positive electrode and the negative electrode) according to the spacing method of “negative electrode-separator-positive electrode-separator-negative electrode…”, the impact factor is 4i. Figure 3 The geometric relationship of the winding structure shown in the figure shows that the actual position of the positive electrode tab will move outward by π×T with each additional layer of separator. s Therefore, the diaphragm influence factor of the i-th positive electrode tab is 4i×π×T s , where T sis the actual thickness of the diaphragm; as the winding progresses, the actual position of the tab will move outward by π×T for each additional positive electrode layer. a The distance, T a is the actual thickness of the positive electrode sheet. According to the spacing method of “negative electrode – separator – positive electrode – separator – negative electrode…”, the influence factor of the i-th positive electrode tab is 2i-1, and the positive electrode influence factor of the i-th positive electrode tab is (2i-1)×π×T a ; With each additional layer of negative electrode, the actual position of the tab will move outward by π×T c The distance, T c is the actual thickness of the negative electrode sheet. According to the spacing method of “negative electrode – separator – positive electrode – separator – negative electrode…”, the influence factor of the i-th positive electrode tab is 2i-3, and the negative electrode influence factor of the i-th positive electrode tab is (2i-3)×π×T c .

[0148] Since different winding structures may lead to different cell influence factors of different battery cell materials on different electrode tabs, and the thickness of the positive electrode material and the negative electrode material may also be different, therefore, separately determining the positive electrode influence factor and the negative electrode influence factor can fully consider the influence of the thickness of the positive electrode material and the negative electrode material on the tab spacing of the corresponding tabs, thereby obtaining a more accurate reference tab spacing and improving the accuracy of tab detection.

[0149] Step 4 , the reference tab spacing of the i-th tab is determined based on the single-turn winding circumference, the diaphragm influence factor, and the battery cell influence factor.

[0150] In some embodiments, the battery cell material includes positive electrode material and negative electrode material. According to different material spacing methods, the positive electrode tabs and the negative electrode tabs may correspond to different reference tab spacings.

[0151] Among them, it is necessary to determine the corresponding diaphragm influence factor and battery cell influence factor for the positive electrode tab and the negative electrode tab respectively.

[0152] The embodiments of this application are as follows Figure 3 The winding structure shown is taken as an example to illustrate the process of determining the tab misalignment result.

[0153] The calculation method of the reference tab spacing of the i-th negative electrode tab is as follows:

[0154] X i =2W+2πr 0 +(4i-2)×π×T s +(2i-3)×π×(T a +T c ) Formula 1,

[0155] Among them, X i is the reference tab spacing of the ith negative electrode tab, W is the straight line length in the material winding model, r 0 is the radius of the innermost semicircle, T s is the actual thickness of the diaphragm, T a is the actual thickness of the positive electrode sheet, T c is the actual thickness of the negative electrode sheet, 2W+2πr 0 is the circumference of a single coil, (4i-2)×π×T s is the membrane influence factor corresponding to the i-th negative electrode tab, (2i-3)×π×(T a +T c ) is the cell influence factor corresponding to the i-th negative electrode tab, i ≥ 2 and i is a positive integer.

[0156] The calculation method of the reference tab spacing of the i-th positive tab is as follows:

[0157] Y i =2W+2πr 0 +4i×π×T s +(2i-1)×π×T a +(2i-3)×π×T c

[0158] Formula 2,

[0159] Among them, Y i is the reference tab spacing of the ith positive tab, W is the straight line length in the material winding model, r 0 is the radius of the innermost semicircle, T s is the actual thickness of the diaphragm, T a is the actual thickness of the positive electrode sheet, T c is the actual thickness of the negative electrode sheet, 2w+2πr 0 is the circumference of a single coil, 4i×π×T s is the diaphragm influence factor corresponding to the i-th positive electrode tab, (2i-1)×π×T a is the positive electrode influence factor corresponding to the i-th positive electrode tab, (2i-3)×π×T c is the negative electrode influence factor corresponding to the i-th positive electrode tab, i ≥ 2 and i is a positive integer.

[0160] By obtaining the reference tab spacing through the single-turn winding circumference, diaphragm influence factor, and battery cell influence factor, it is possible to fully consider the impact of battery material thickness on the tab spacing, provide an accurate tab spacing benchmark value for subsequent tab spacing calibration, and improve the accuracy of tab misalignment detection.

[0161] Step 232: Obtain a first offset and a second offset corresponding to the ith tab based on the winding parameters and the material winding model.

[0162] The first offset is used to indicate the die-cutting pitch offset of the ith tab, and the second offset is used to indicate the offset between the tab pitch of the ith tab in the material winding model and the reference tab pitch.

[0163] The first offset, namely the die-cutting spacing offset, refers to the deviation between the position of the pole lug and the theoretical position due to changes in parameters such as the pole piece die-cutting size and pole piece thickness during the die-cutting process.

[0164] Optionally, the first offset is related to factors such as the error in the die-cutting size of the pole piece, the non-uniformity of the thickness of the pole piece, the geometric shape of the winding needle, etc.

[0165] The second offset, namely the tab spacing offset, refers to the deviation between the tab spacing and the reference tab spacing due to changes in parameters such as winding tension, winding needle circumference, and diaphragm thickness during the tab winding process.

[0166] Based on the material winding model, the movement trajectory and deformation of the tab during the winding process can be simulated to calculate the second offset.

[0167] Optionally, the second offset is related to factors such as winding tension, membrane thickness, winding needle circumference, winding speed, etc.

[0168] The first offset and the second offset respectively reflect the possible deviation of the tab during the die-cutting and winding processes, and provide basic data for subsequent offset correction.

[0169] Step 233, correcting the second offset by using the first offset and the winding parameter to obtain the tab spacing offset of the i-th tab.

[0170] In some embodiments, since the actual thickness of the battery material in the winding structure and the winding needle size may differ from the design values, an offset in the tab spacing is generated due to the material thickness deviation and the winding needle size deviation. Therefore, when correcting the second offset by the first offset, it is also necessary to correct the second offset by the material thickness parameter and the winding needle size parameter in the winding parameters.

[0171] As Figure 3 Taking the winding structure shown in the figure as an example, the battery material includes a diaphragm material and a battery core material, and the process of correcting the second offset to obtain the tab spacing offset includes the following steps:

[0172] first step , the diaphragm deviation and cell deviation are obtained based on the winding parameters and material winding model.

[0173] The diaphragm deviation is used to indicate the tab spacing offset caused by the thickness deviation of the diaphragm material, and the cell deviation is used to indicate the tab spacing offset caused by the thickness deviation of the cell material.

[0174] When obtaining the diaphragm deviation and the battery cell deviation, it is necessary to first obtain the thickness deviation of the diaphragm material and the thickness deviation of the battery cell material.

[0175] Schematically, the diaphragm thickness of the diaphragm material in the material winding model and the cell thickness of the cell material in the material winding model are obtained; the reference diaphragm thickness of the diaphragm material in the winding parameters and the reference cell thickness of the cell material are obtained; the diaphragm deviation for the ith pole ear is determined based on the difference between the diaphragm thickness and the reference diaphragm thickness and the material winding model; the cell deviation for the ith pole ear is determined based on the difference between the cell thickness and the reference cell thickness and the material winding model.

[0176] The separator thickness and the cell thickness are the actual material thickness of the battery material in the winding structure obtained by simulating the material winding model. The reference separator thickness and the reference cell thickness are the design values ​​of the battery material thickness (which can be input by the user).

[0177] When the battery cell materials include positive electrode materials and negative electrode materials, it is necessary to determine the diaphragm deviation and battery cell deviation of the i-th positive electrode tab, and the diaphragm deviation and battery cell deviation of the i-th negative electrode tab, respectively.

[0178] Schematically, taking the i-th positive electrode tab as an example, the diaphragm deviation for the i-th positive electrode tab is determined based on the membrane thickness of the diaphragm material between the i-th positive electrode tab and the i-1th positive electrode tab and the reference diaphragm thickness, and the cell deviation for the i-th positive electrode tab is determined based on the cell thickness of the cell material between the i-th positive electrode tab and the i-1th positive electrode tab and the reference cell thickness.

[0179] The diaphragm deviation for the ith lug is determined by the difference between the diaphragm thickness and the reference diaphragm thickness, which can accurately reflect the influence of the diaphragm thickness deviation on the lug spacing of the ith lug. The cell deviation for the ith lug is determined by the difference between the cell thickness and the reference cell thickness and the material winding model, which can accurately reflect the influence of the cell thickness deviation on the lug spacing of the ith lug. The lug spacing offset caused by the error between the actual thickness and the designed thickness of the battery material is fully considered, thereby improving the accuracy of the lug spacing offset.

[0180] Step 2 , the winding needle deviation is obtained based on the winding needle radius in the winding parameters and the material winding model.

[0181] The winding needle deviation is used to indicate the offset of the tab spacing caused by the winding needle radius.

[0182] In some embodiments, the change in the circumference of the winding needle can be obtained as the winding needle deviation. The change in the circumference of the winding needle refers to the change in the outer circumference of the winding needle due to the adjustment of the winding needle structure during the battery winding process, thereby affecting the battery winding size and the parameters of the electrode alignment.

[0183] By obtaining the winding needle deviation, it is possible to take into account the impact of the winding needle's size error on the tab spacing, such as the deviation between the winding needle's design size and the winding needle's actual size causing the offset of the tab spacing, and to consider the impact on the tab spacing caused by dynamically adjusting the winding needle structure during the winding process. While fully considering the impact of the winding needle size deviation, it is possible to adapt to the design of a variable circumference winding needle, thereby improving the accuracy of tab detection in a variety of scenarios.

[0184] Step 3 The second offset is corrected by the first offset, the diaphragm deviation, the cell deviation and the winding needle deviation to obtain the tab spacing offset of the i-th tab.

[0185] In some embodiments, the tab spacing offset of the ith tab is obtained by accumulating the first offset, diaphragm deviation, cell deviation, winding needle deviation and second offset corresponding to the ith tab.

[0186] When the battery cell material includes positive electrode material and negative electrode material, it is necessary to calibrate the tab spacing offset of the i-th positive electrode tab and the tab spacing offset of the i-th negative electrode tab respectively.

[0187] For the determination method of the tab spacing offset of the i-th negative electrode tab (i.e., the offset between the i-th negative electrode tab spacing and the reference tab spacing), please refer to the following formula 3:

[0188] A i =(4i-2)×π×(T s -T g )+(2i-3)×π×(T a +T c -T z -T f )+D i +

[0189] ΔL+ΔA i Formula 3,

[0190] Among them, A i is the tab spacing offset of the ith negative tab, T s is the actual thickness of the diaphragm (i.e. the thickness of the diaphragm), T g is the design thickness of the diaphragm (i.e. the reference diaphragm thickness), T a is the actual thickness of the positive electrode sheet, T z Design thickness of positive electrode, T cis the actual thickness of the negative electrode sheet, T f is the designed thickness of the negative electrode sheet, (4i - 2)×π×(T s -T g ) is the diaphragm deviation corresponding to the i-th negative electrode tab, (2i - 3)×π×(T a +T c -T z -T f ) is the cell deviation corresponding to the i-th negative electrode tab, D i is the second offset corresponding to the i-th negative electrode tab, ΔA i is the first offset corresponding to the i-th negative electrode tab (i.e., the die-cutting spacing offset of the i-th negative electrode tab), ΔL is the winding needle deviation, i≥2 and i is a positive integer.

[0191] For the determination method of the tab spacing offset of the i-th positive electrode tab (i.e., the offset between the i-th positive electrode tab spacing and the reference tab spacing), please refer to the following formula 4:

[0192] C i =4i×π×(T s -T g )+(2i - 1)×π×(T a -T z )+(2i - 3)×π×(T c -

[0193] T f )+E i +ΔL+ΔC i Formula 4,

[0194] where, A i is the tab spacing offset of the i-th positive electrode tab, T s is the actual thickness of the separator (i.e., the separator thickness), T g is the designed thickness of the separator (i.e., the reference separator thickness), T a is the actual thickness of the positive electrode sheet, T z is the designed thickness of the positive electrode sheet, T c is the actual thickness of the negative electrode sheet, T f is the designed thickness of the negative electrode sheet, 4i×π×(T s -T g ) is the diaphragm deviation corresponding to the i-th positive electrode tab, (2i - 1)×π×(T a -T z )+(2i - 3)×π×(T c -T f ) is the cell deviation corresponding to the i-th positive electrode tab, E i is the second offset corresponding to the i-th positive electrode tab, ΔC iis the first offset corresponding to the i-th positive electrode tab (i.e., the die-cutting spacing offset of the i-th positive electrode tab), ΔL is the winding needle deviation, i≥2 and i is a positive integer.

[0195] By correcting the second offset by the first offset, diaphragm deviation, battery cell deviation and winding needle deviation, the tab spacing offset of the ith tab is obtained. This allows the tab spacing offset to fully consider the tab spacing offset caused by die-cutting error, material thickness error, winding needle size error, etc., so that the obtained tab spacing offset can more comprehensively and accurately simulate the offset in the actual winding situation, thereby improving the accuracy of the tab spacing offset.

[0196] Step 234, determining the tab misalignment result based on the tab spacing offsets corresponding to the multiple tabs in the battery cell material.

[0197] Schematically, the reference tab position is usually the tab position of the first tab of the first layer of battery material during the winding process. For the ith tab, the tab misalignment result of the ith tab can be determined based on the tab spacing offsets corresponding to the second to i tabs in the battery cell material, respectively. i ≥ 2 and i is a positive integer. The tab misalignment result of the ith tab is the sum of the tab spacing offsets between the second to i tabs and the first tab.

[0198] In some embodiments, the battery cell material includes a positive electrode material and a negative electrode material, and the tab misalignment result of the positive electrode tab and the tab misalignment result of the negative electrode tab need to be determined separately.

[0199] Indicatively, the positive electrode tab misalignment result is determined based on the positive electrode tab spacing offsets corresponding to multiple positive electrode tabs in the positive electrode material; the negative electrode tab misalignment result is determined based on the negative electrode tab spacing offsets corresponding to multiple negative electrode tabs in the negative electrode material.

[0200] For the ith negative electrode tab, the tab misalignment result of the ith negative electrode tab can be determined based on the tab spacing offsets corresponding to the 2nd to ith negative electrode tabs in the battery cell material, i≥2 and i is a positive integer, and the tab misalignment result of the ith negative electrode tab is the sum of the tab spacing offsets between the 2nd to ith negative electrode tabs and the 1st negative electrode tab.

[0201] Indicatively, in combination with the above formula 3, for the method of determining the negative electrode tab misalignment result of the i-th negative electrode tab, please refer to the following formula 5:

[0202] A 2 +A 3 +A 4 +…+A i =2(i 2 -1)×π×(T s -T g)+(i 2 -2i+1)×π×

[0203] (T a +T c -T z -T f )+SD i +i×ΔL+i×ΔA i Formula 5,

[0204] Among them, A i is the negative electrode tab spacing offset of the i-th negative electrode tab, T s is the actual thickness of the diaphragm (i.e. the thickness of the diaphragm), T g is the design thickness of the diaphragm (i.e. the reference diaphragm thickness), T a is the actual thickness of the positive electrode sheet, T z Design thickness of positive electrode, T c is the actual thickness of the negative electrode sheet, T f Design thickness for negative electrode sheet, SD i is the accumulation of the second offsets corresponding to all negative electrode tabs, ΔA i is the first offset corresponding to the i-th negative electrode tab (i.e., the die-cutting spacing offset of the i-th negative electrode tab), ΔL is the winding needle deviation, i≥2 and i is a positive integer.

[0205] For the ith positive electrode tab, the tab misalignment result of the ith positive electrode tab can be determined based on the tab spacing offsets corresponding to the 2nd to ith positive electrode tabs in the battery cell material, where i≥2 and i is a positive integer, and the tab misalignment result of the ith positive electrode tab is the sum of the tab spacing offsets between the 2nd to ith positive electrode tabs and the 1st positive electrode tab.

[0206] Indicatively, in combination with the above formula 4, for the method of determining the positive electrode tab misalignment result of the i-th positive electrode tab, please refer to the following formula 6:

[0207] C 2 +C 3 +C 4 +…+C i =2(i 2 +i-2)×π×9T s -T g )+(i 2 -1)×π×(T a -T z )+(i 2 -2i+1)×π×(T c -T f )+SE i +i×ΔL+i×ΔC i Formula 6,

[0208] Among them, C i is the positive electrode tab spacing offset of the ith positive electrode tab, T s is the actual thickness of the diaphragm (i.e. the diaphragm thickness), T g is the design thickness of the diaphragm (i.e. the reference diaphragm thickness), T a is the actual thickness of the positive electrode sheet, T z Design thickness of positive electrode, T c is the actual thickness of the negative electrode sheet, T f Design thickness for negative electrode sheet, SE i is the accumulation of the second offsets corresponding to all positive electrode tabs, ΔC i is the first offset corresponding to the i-th positive electrode tab (i.e., the die-cutting spacing offset of the i-th positive electrode tab), ΔL is the winding needle deviation, i≥2 and i is a positive integer.

[0209] By determining the positive electrode tab misalignment result based on the tab spacing offset corresponding to the positive electrode tab, and determining the negative electrode tab misalignment result based on the tab spacing offset corresponding to the negative electrode tab, the tab misalignment results of different electrode tabs in the same winding structure can be fully reflected, which helps to adjust the winding parameters in a targeted manner and improve the tab alignment efficiency.

[0210] In summary, the method provided in the embodiment of the present application, by obtaining the reference tab spacing, obtaining the second offset represented in the material winding model, and correcting the second offset by the first offset and the winding parameters, can fully consider the tab spacing offset caused by various factors such as die-cutting size deviation, material thickness deviation, and winding tension during the winding process of the battery material, thereby more accurately determining the tab misalignment result and improving the efficiency and accuracy of tab detection.

[0211] In some embodiments, after obtaining the tab misalignment result, the winding parameters can be adjusted to calibrate the tab position. Figure 5 , which shows a flowchart of a tab calibration method provided by an exemplary embodiment of the present application. The method can be executed by a terminal, or by a server, or by both a terminal and a server. The present application embodiment takes the method executed by a terminal as an example for explanation. Figure 5 As shown, the above step 230 also includes the following steps:

[0212] Step 510: Adjust the winding parameters based on the tab misalignment result to obtain reference winding parameters.

[0213] The reference winding parameters are used to indicate the relevant parameters of battery material winding obtained with the calibration tab as the goal.

[0214] Indicatively, the reference winding parameters can be automatically adjusted based on the tab misalignment results according to the alignment requirements to align the tabs in the winding structure.

[0215] The alignment requirement is used to indicate the degree of adjustment of the winding parameters.

[0216] Taking the battery cell materials including positive electrode materials and negative electrode materials as an example, the positive electrode material includes the positive electrode tab, and the negative electrode material includes the negative electrode tab. When the tab misalignment result indicates that the positive electrode tab and the negative electrode tab are misaligned at the same time, and the misalignment direction is a first direction, the winding parameters are adjusted to obtain first reference winding parameters; when the tab misalignment result indicates that the positive electrode tab and the negative electrode tab are misaligned at the same time, and the misalignment direction is a second direction, the winding parameters are adjusted to obtain second reference winding parameters.

[0217] Among them, the first reference winding parameter is used to indicate at least one of increasing the thickness of the battery cell material, reducing the circumference of the winding needle, and reducing the die-cutting size, and the die-cutting size is used to indicate the size of the pole ear; the second reference winding parameter is used to indicate at least one of reducing the thickness of the battery cell material, increasing the circumference of the winding needle, and increasing the die-cutting size; the first direction is opposite to the second direction.

[0218] In some embodiments, the tab misalignment result may indicate that the tab has a "C-shaped" misalignment. C-shaped misalignment is usually manifested as the tab presenting a shape similar to the letter "C" during the winding process, that is, one end of the tab bends inward or outward, resulting in the tab being misaligned. This misalignment phenomenon is usually related to the mismatch of parameters such as the pole piece, the diaphragm, and the winding needle.

[0219] The root cause of C-shaped misalignment is that the pole piece and the diaphragm are subjected to uneven force during the winding process, causing the pole ear to bend during winding. Specifically, C-shaped misalignment is usually related to the following factors:

[0220] Uneven thickness of the pole piece: Uneven thickness of the pole piece will lead to uneven force on the pole piece during winding, which will cause the pole ear to bend.

[0221] The thickness of the diaphragm is not appropriate: The thickness of the diaphragm will affect the fit between the pole piece and the diaphragm. A diaphragm that is too thick or too thin will cause the pole tab to be misaligned.

[0222] The circumference of the winding needle is not appropriate: The circumference of the winding needle directly affects the tightness of the winding. If the circumference is too large, the gap between the pole piece and the diaphragm will be too large, and if the circumference is too small, the winding will be too tight.

[0223] Improper die-cutting size: The die-cutting size determines the width and length of the pole piece. Die-cutting size that is too large or too small will affect the alignment of the pole ear.

[0224] Taking the positive electrode C-type misalignment as an example, the positive electrode C-type misalignment is usually manifested as the positive electrode ear bending inward to form a C shape.

[0225] In an optional embodiment, the C-shaped misalignment of the positive electrode may be due to insufficient thickness of the diaphragm, which results in the positive electrode tab not being adequately supported during the winding process and thus bending inward. Therefore, the thickness of the diaphragm can be increased to ensure that the positive electrode tab has sufficient support during the winding process to prevent the tab from bending inward.

[0226] In an optional embodiment, if the circumference of the winding needle is too large, the gap between the positive electrode sheet and the separator will be too large, and the sheet will be easily bent inward during winding, forming a C-shaped misalignment. The circumference of the winding needle can be reduced to increase the tightness of the winding, ensure the fit between the positive electrode sheet and the separator, and prevent the tabs from bending inward.

[0227] In an optional embodiment, if the die-cutting size is too large, the width of the positive electrode sheet will be too large, and the sheet will be easily bent inward during winding, forming a C-shaped misalignment. The die-cutting size can be reduced to ensure that the width of the positive electrode sheet is moderate to avoid the sheet bending inward during winding.

[0228] Taking the negative electrode C-type misalignment as an example, the negative electrode C-type misalignment is usually manifested as the negative electrode ear bending outward to form a C shape.

[0229] In an optional embodiment, the negative electrode C-shaped misalignment is usually caused by the separator being too thick, which causes the negative electrode tab to be subjected to excessive pressure during the winding process and then bend outward. The thickness of the separator can be reduced to ensure that the negative electrode tab is not subjected to excessive pressure during the winding process and to prevent the tab from bending outward.

[0230] In an optional embodiment, if the circumference of the winding needle is too small, the gap between the negative electrode sheet and the separator will be too small, and the sheet will be easily bent outward during winding, forming a C-shaped misalignment. The circumference of the winding needle can be increased, the tightness of the winding can be reduced, and the fit between the negative electrode sheet and the separator can be ensured to be moderate, so as to avoid the tab from bending outward.

[0231] In an optional embodiment, if the die-cutting size is too small, the width of the negative electrode sheet will be too small, and the sheet will be easily bent outward during winding, forming a C-shaped misalignment. The die-cutting size can be increased to ensure that the width of the negative electrode sheet is moderate to avoid the sheet bending outward during winding.

[0232] The root cause of C-shaped misalignment is that the pole piece and the separator are subjected to uneven force during the winding process, causing the pole ears to bend inward or outward. The C-shaped misalignment of the positive and negative electrodes is different, mainly because the material properties of the positive and negative electrodes are different, resulting in different force conditions during the winding process.

[0233] Taking the positive electrode C-type misalignment indicating that the positive and negative electrodes are misaligned at the same time and the misalignment direction is toward the positive electrode as an example, when adjusting the winding parameters, the thickness of the battery cell material can be increased, the circumference of the winding needle can be reduced, the die-cutting size can be reduced, etc.; taking the negative electrode C-type misalignment indicating that the positive and negative electrodes are misaligned at the same time and the misalignment direction is toward the negative electrode as an example, when adjusting the winding parameters, the thickness of the battery cell material can be reduced, the circumference of the winding needle can be increased, the die-cutting size can be increased, etc.

[0234] By adjusting the winding parameters, including but not limited to the thickness of the battery cell material, the circumference of the winding needle, the die-cutting size, etc., according to different tab misalignment results, the tab correction efficiency can be improved.

[0235] After adjusting the winding parameters, the tab misalignment result can be re-detected based on the battery tab misalignment detection method provided in the embodiment of the present application, and a simulation verification can be performed.

[0236] Indicatively, the tab misalignment result is automatically re-obtained based on the reference winding parameters and the material winding model, and the reference winding parameters are adjusted based on the tab misalignment result until the preset requirements are met.

[0237] Optionally, the preset requirements include but are not limited to at least one of the following: the number of adjustments reaches a preset number threshold, or the tab spacing offset indicated by the tab misalignment result is less than a preset misalignment offset, or the adjustment amplitude of the winding parameter reaches a preset amplitude threshold.

[0238] After adjusting to obtain the reference winding parameters, the lug winding conditions are re-simulated based on the reference winding parameters and the material winding model, the lug misalignment results are detected, and adjustments are made iteratively. The optimal winding parameters can be simulated based on the mathematical model, so that when the battery material is put into production, the lug misalignment of the battery material in the actual winding structure can be made to meet the preset requirements as much as possible, thereby reducing the number of production experiments, reducing experimental costs, and improving the effectiveness of lug detection.

[0239] In some embodiments, if preset requirements are met, the reference winding parameters are stored as candidate winding parameters in a candidate database; a first winding parameter input by a user is received; and if the first winding parameter matches a second candidate winding parameter among multiple candidate winding parameters, recommendation information is displayed.

[0240] Optionally, the recommendation information includes but is not limited to at least one of the second candidate winding parameter, the second tab misalignment result, and the difference between the first winding parameter and the second candidate winding parameter. The second tab misalignment result is the tab misalignment result corresponding to the second candidate winding parameter.

[0241] The first winding parameter matches the second candidate winding parameter means that the parameter similarity between the first winding parameter and the second candidate winding parameter reaches a first preset similarity, or the structural similarity between the battery material winding structure corresponding to the first winding parameter and the battery material winding structure corresponding to the second candidate winding parameter reaches a second preset similarity, or the specified type parameter in the first winding parameter is the same as the corresponding type parameter in the second candidate winding parameter, etc.

[0242] By obtaining a second candidate winding parameter that matches the first winding parameter from a candidate database to display recommended information, designers can quickly select untested or relatively suitable winding parameters to detect lug misalignment results, thereby improving the design efficiency of battery winding parameters.

[0243] In some embodiments, the winding structure simulated by the mathematical model can also be displayed by a virtual reality (VR) device.

[0244] Schematically, a first three-dimensional winding model is displayed through a VR device, the first three-dimensional winding model is a three-dimensional model rendered based on winding parameters and a material winding model, and the first three-dimensional model is used to express a three-dimensional winding structure formed by a battery material according to a winding circular motion based on the winding parameters; a simulation adjustment operation for the first three-dimensional model is received, and the simulation adjustment operation is used to indicate that the three-dimensional winding structure of the battery material is adjusted according to reference adjustment parameters in the first three-dimensional winding model; based on the simulation adjustment operation, a second three-dimensional winding model is displayed, and the second three-dimensional winding model is a three-dimensional model rendered based on reference winding parameters and a material winding model, and the second three-dimensional winding model is used to express a three-dimensional winding structure formed by a battery material according to a winding circular motion based on the reference winding parameters.

[0245] Optionally, the simulated adjustment operation includes but is not limited to dragging operations on battery materials, for example, stretching the diaphragm or positive and negative electrodes to reduce or enlarge the thickness of the battery materials, die-cutting size, etc.; or, adjustment operations on the winding needle, for example, selecting a candidate virtual winding needle to simulate the replacement of the winding needle to adjust the circumference of the winding needle, etc.

[0246] It is worth noting that the above-mentioned simulation adjustment operation is only an illustrative example and is not limited to this in the embodiments of the present application.

[0247] The reference winding parameters can be obtained based on a simulated adjustment operation. For example, the adjustment amplitude of the battery material thickness is determined according to the dragging distance of the dragging operation on the battery material. For example, the adjustment amplitude is determined at a ratio of 100:1, and the thickness is adjusted by 1mm for every 1cm of dragging. The adjustment direction of the battery material thickness is determined according to the dragging direction. For example, when dragging outward along the winding direction, the thickness of the battery material increases, and when dragging inward along the winding direction, the thickness of the battery material decreases, etc.

[0248] By displaying the first three-dimensional winding model in a VR device, receiving a simulated adjustment operation, and displaying the adjusted second three-dimensional winding model, the user can simulate the adjustment process in the actual battery winding process in a visual manner, so that the user can adjust the reference winding parameters based on the visualization effect and predict the three-dimensional winding knot, thereby improving the parameter adjustment efficiency.

[0249] In some embodiments, the comparison results of the tab misalignment between the first three-dimensional winding model and the second three-dimensional winding model can also be displayed through a VR device. The tab misalignment comparison results are used to indicate the difference between the tab misalignment results in the first three-dimensional model and the tab misalignment results in the second three-dimensional model.

[0250] By displaying the comparison results of the tab misalignment, the adjustment effect based on the reference winding parameters can be intuitively reflected, and the user can be assisted from a visual perspective to determine whether further adjustments are needed to improve the tab alignment efficiency.

[0251] To summarize, the method provided in the embodiment of the present application adjusts the winding parameters according to the tab misalignment results to obtain a reference winding book, which can obtain relevant parameters for winding of battery materials after calibrating the tabs, thereby using the reference winding parameters for subsequent testing or actual battery preparation experiments and other scenarios to help users obtain winding parameters that can assist in tab alignment, reduce the probability of tab misalignment in the actual winding structure, and improve tab calibration efficiency.

[0252] The method provided in the embodiment of the present application can provide a parameter interface for data collection and input through the terminal, so that the operator can accurately input the key parameters in the lithium battery winding process, including the output of the pole piece thickness, the thickness of the diaphragm, the circumference of the winding needle, the number of layers of the winding needle posting position, the winding tension, and the pole piece die-cutting size. These data will serve as the basis for subsequent simulation calculations. Based on the mathematical principles and mechanical analysis of circular motion, combined with the input incoming material data and winding process parameters, a mathematical model of the core winding process is established. The model accurately describes the motion trajectory, deformation and mechanical relationship between the pole piece and the diaphragm during the winding process, and fully considers the stretching and compression effects of the winding tension on the pole piece and the diaphragm, as well as the influence of the winding needle geometry on the winding uniformity. Through the built-in intelligent optimization algorithm of the software program, the relevant factors that need to be adjusted can be automatically output according to the preset pole ear alignment target value. Through multiple simulation calculations, the optimal parameter combination that meets the pole ear alignment requirements is quickly output.

[0253] Through precise simulation analysis, it is possible to quickly screen out better parameter combinations in a virtual environment, avoiding a large number of blind experiments, significantly reducing the number of experiments, and greatly saving raw materials, equipment operating time and human resource costs; precise calculation of tab alignment and optimized process parameters effectively reduce the tab misalignment problem, and significantly improve product consistency and yield; fast simulation analysis and parameter optimization functions greatly shorten the product R&D cycle and production debugging time, enabling companies to respond to market changes more quickly, launch new products in advance, and enhance market competitiveness; the software's effective management and in-depth analysis capabilities of experimental data help companies accumulate valuable process knowledge and technical experience, facilitate technology inheritance and continuous improvement, and promote the transformation of companies from traditional empirical production to digital and intelligent manufacturing, thereby improving the overall management level and innovation capabilities of companies.

[0254] Figure 6 is a structural block diagram of a battery tab misalignment detection device provided by an exemplary embodiment of the present application, such as Figure 6 As shown, the device includes the following parts:

[0255] An acquisition module 610 is used to acquire winding parameters for winding battery materials, wherein the winding parameters are used to indicate relevant parameters of winding the battery materials, wherein the battery materials include battery core materials;

[0256] The processing module 620 is further used to obtain a material winding model, wherein the material winding model is a model for representing that the battery material forms a winding structure according to a winding circular motion, wherein the winding circular motion is used to indicate a movement trajectory of the battery material during the winding process;

[0257] The processing module 620 is also used to obtain the tab misalignment result of the battery cell material based on the winding parameters and the material winding model. The tab misalignment result is used to indicate the tab offset between the tab winding position of the battery cell material and the reference tab position. The reference tab position is used to provide a reference position for calibrating the tab of the battery cell material.

[0258] In some embodiments, the processing module 620 is further configured to:

[0259] Obtaining a reference tab spacing of the ith tab in the battery core material, where i≥2 and i is a positive integer, the reference tab spacing is used to indicate the material distance between the ith tab and the i-1th tab;

[0260] Acquire a first offset and a second offset corresponding to the ith tab based on the winding parameter and the material winding model, wherein the first offset is used to indicate a die-cutting spacing offset of the ith tab, and the second offset is used to indicate an offset between a tab spacing of the ith tab in the material winding model and a reference tab spacing;

[0261] Correcting the second offset by using the first offset and the winding parameter to obtain the tab spacing offset of the i-th tab;

[0262] The tab misalignment result is determined based on the tab spacing offsets respectively corresponding to a plurality of tabs in the battery core material.

[0263] In some embodiments, the battery material further includes a separator material;

[0264] The processing module 620 is further configured to:

[0265] Obtaining the circumference of a single winding circle in the winding circular motion;

[0266] Determining a diaphragm influence factor based on the thickness of the diaphragm material according to the winding circular motion, the diaphragm influence factor being used to indicate the degree of influence of the thickness of the diaphragm material on the winding circumference in the i-layer winding of the winding process;

[0267] Determining a cell influence factor based on the thickness of the cell material according to the winding circular motion, the cell influence factor being used to indicate the degree of influence of the thickness of the cell material on the winding circumference in the i-layer winding;

[0268] The reference tab spacing of the ith tab is determined based on the single-turn winding circumference, the separator influence factor, and the battery cell influence factor.

[0269] In some embodiments, the battery core material includes positive electrode material and negative electrode material;

[0270] The processing module 620 is further configured to:

[0271] Determining a negative electrode influence factor based on the thickness of the negative electrode material according to the winding circular motion, the negative electrode influence factor being used to indicate the degree of influence of the thickness of the negative electrode material on the winding circumference in the i-layer winding;

[0272] Determining a positive electrode influence factor based on the thickness of the positive electrode material according to the winding circular motion, the positive electrode influence factor being used to indicate the degree of influence of the thickness of the positive electrode material on the winding circumference in the i-layer winding;

[0273] The cell influence factor is determined based on the negative electrode influence factor and the positive electrode influence factor.

[0274] In some embodiments, the battery material further includes a separator material;

[0275] The processing module 620 is further configured to:

[0276] Acquire a diaphragm deviation and a cell deviation based on the winding parameter and the material winding model, wherein the diaphragm deviation is used to indicate an offset of the distance between the tabs caused by a thickness deviation of the diaphragm material, and the cell deviation is used to indicate an offset of the distance between the tabs caused by a thickness deviation of the cell material;

[0277] Acquire a winding needle deviation based on a winding needle radius in the winding parameters and the material winding model, wherein the winding needle deviation is used to indicate an offset of the tab spacing caused by the winding needle radius;

[0278] The second offset is corrected by the first offset, the diaphragm deviation, the battery cell deviation and the winding needle deviation to obtain the tab spacing offset of the i-th tab.

[0279] In some embodiments, the acquisition module 610 is further used to acquire the thickness of the separator material represented by the material winding model, and the thickness of the battery cell represented by the battery cell material in the material winding model;

[0280] The acquisition module 610 is further used to acquire a reference diaphragm thickness of the diaphragm material in the winding parameters and a reference cell thickness of the cell material;

[0281] The processing module 620 is further configured to determine the diaphragm deviation for the i-th tab based on the difference between the diaphragm thickness and the reference diaphragm thickness and the material winding model;

[0282] The processing module 620 is further configured to determine the cell deviation for the i-th tab based on a difference between the cell thickness and the reference cell thickness and the material winding model.

[0283] In some embodiments, the battery core material includes positive electrode material and negative electrode material;

[0284] The processing module 620 is further configured to:

[0285] Determining a positive electrode tab misalignment result based on the positive electrode tab spacing offsets respectively corresponding to a plurality of positive electrode tabs in the positive electrode material;

[0286] The negative electrode tab misalignment result is determined based on the negative electrode tab spacing offsets respectively corresponding to the multiple negative electrode tabs in the negative electrode material.

[0287] In some embodiments, the processing module 620 is further used to adjust the winding parameters based on the tab misalignment result to obtain reference winding parameters, and the reference winding parameters are used to indicate relevant parameters of the battery material winding obtained for the purpose of calibrating the tab.

[0288] In some embodiments, the battery core material includes a positive electrode material and a negative electrode material, the positive electrode material includes a positive electrode tab, and the negative electrode material includes a negative electrode tab;

[0289] The processing module 620 is further configured to:

[0290] When the tab misalignment result indicates that the positive tab and the negative tab are misaligned at the same time, and the misalignment direction is a first direction, adjusting the winding parameter to obtain a first reference winding parameter, the first reference winding parameter is used to indicate at least one of increasing the thickness of the battery material, reducing the circumference of the winding needle, and reducing the die-cutting size, and the die-cutting size is used to indicate the size of the tab;

[0291] When the tab misalignment result indicates that the positive tab and the negative tab are misaligned at the same time and the misalignment direction is a second direction, the winding parameters are adjusted to obtain second reference winding parameters, and the second reference winding parameters are used to indicate at least one of reducing the thickness of the battery cell material, increasing the circumference of the winding needle, and increasing the die-cutting size, wherein the first direction is opposite to the second direction.

[0292] In some embodiments, the processing module 620 is further used to automatically reacquire the tab misalignment result based on the reference winding parameters and the material winding model, and adjust the reference winding parameters based on the tab misalignment result until preset requirements are met.

[0293] In some embodiments, the processing module 620 is further used to store the reference winding parameter as a candidate winding parameter in a candidate database when the preset requirement is met, wherein the candidate database includes a plurality of candidate winding parameters;

[0294] The acquisition module 610 is further used to receive a first winding parameter input by a user;

[0295] The processing module 620 is also used to display recommendation information when the first winding parameter matches a second candidate winding parameter among the multiple candidate winding parameters, wherein the recommendation information includes the second candidate winding parameter, a second pole lug misalignment result, and a difference between the first winding parameter and the second candidate winding parameter, wherein the second pole lug misalignment result is a pole lug misalignment result corresponding to the second candidate winding parameter.

[0296] In some embodiments, the processing module 620 is further configured to:

[0297] Displaying a first three-dimensional winding model through a virtual reality device, the first three-dimensional winding model is a three-dimensional model rendered based on the winding parameters and the material winding model, and the first three-dimensional winding model is used to express a three-dimensional winding structure of the battery material formed according to the winding circular motion based on the winding parameters;

[0298] receiving a simulation adjustment operation for the first three-dimensional winding model, wherein the simulation adjustment operation is used to instruct to adjust the three-dimensional winding structure of the battery material in the first three-dimensional winding model according to the reference winding parameters;

[0299] Based on the simulation adjustment operation, a second three-dimensional winding model is displayed. The second three-dimensional winding model is a three-dimensional model rendered based on the reference winding parameters and the material winding model. The second three-dimensional winding model is used to represent the three-dimensional winding structure of the battery material formed according to the winding circular motion based on the reference winding parameters.

[0300] To sum up, the device provided in the embodiment of the present application obtains a mathematical model that can represent the winding structure of the battery material, so that the winding parameters of the obtained battery material can be substituted into the mathematical model (material winding model) to simulate the actual winding situation of the battery material, thereby obtaining the simulated pole lug misalignment result according to the winding parameters and the simulation situation of the material winding model to assist in calibrating the pole lug position, which can reduce the number of actual winding experiments in the pole lug misalignment detection process, reduce experimental costs, and improve pole lug detection efficiency.

[0301] It should be noted that the battery tab misalignment detection device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0302] Figure 7 The structure block diagram of a terminal 700 provided by an exemplary embodiment of the present application is shown. The terminal 700 may be: a smart phone, a tablet computer, an MP3 player, an MP4 player, a notebook computer or a desktop computer. The terminal 700 may also be called a user equipment, a portable terminal, a laptop terminal, a desktop terminal or other names.

[0303] Typically, the terminal 700 includes a processor 701 and a memory 702 .

[0304] The processor 701 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 701 may be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA). The processor 701 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a central processing unit (CPU); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 701 may be integrated with a graphics processing unit (GPU), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 701 may also include an artificial intelligence (AI) processor, which is used to process computing operations related to machine learning.

[0305] The memory 702 may include one or more computer-readable storage media, which may be non-transitory. The memory 702 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory 702 is used to store at least one instruction, which is used to be executed by the processor 701 to implement the battery tab misalignment detection method provided in the method embodiment of the present application.

[0306] In some embodiments, the terminal 700 further includes other components 703, which can be understood by those skilled in the art. Figure 7 The structure shown in the figure does not constitute a limitation on the terminal 700, and the terminal 700 may include more or less components than those shown in the figure, or combine some components, or adopt a different component arrangement.

[0307] The embodiment of the present application also provides a computer device, which can be implemented as follows: Figure 1 The computer device includes a processor and a memory, wherein at least one instruction, at least one program, code set or instruction set is stored in the memory, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by the processor to implement the battery tab misalignment detection method provided by the above-mentioned method embodiments.

[0308] An embodiment of the present application also provides a computer-readable storage medium, on which is stored at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the battery tab misalignment detection method provided by the above-mentioned method embodiments.

[0309] The embodiments of the present application also provide a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the battery tab misalignment detection method provided by the above-mentioned method embodiments.

[0310] Optionally, the computer readable storage medium may include: Read Only Memory (ROM), Random Access Memory (RAM), Solid State Drives (SSD) or optical disks, etc. Among them, the random access memory may include resistance random access memory (ReRAM) and dynamic random access memory (DRAM). The serial numbers of the above embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments.

[0311] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0312] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting misalignment of a battery tab, characterized in that: The method comprises: Acquire winding parameters for winding battery materials, wherein the winding parameters are used to indicate relevant parameters of winding the battery materials, wherein the battery materials include battery core materials; Acquire a material winding model, wherein the material winding model is a model for representing that the battery material forms a winding structure according to a winding circular motion, wherein the winding circular motion is used to indicate a movement trajectory of the battery material during the winding process; The tab misalignment result of the battery cell material is obtained based on the winding parameters and the material winding model. The tab misalignment result is used to indicate the tab offset between the tab winding position of the battery cell material and the reference tab position. The reference tab position is used to provide a reference position for calibrating the tab of the battery cell material.

2. The method according to claim 1, characterized in that The step of obtaining the tab misalignment result of the battery core material based on the winding parameter and the material winding model includes: Obtaining a reference tab spacing of the ith tab in the battery core material, where i≥2 and i is a positive integer, and the reference tab spacing is used to indicate the material distance between the ith tab and the i-1th tab; Acquire a first offset and a second offset corresponding to the ith tab based on the winding parameter and the material winding model, wherein the first offset is used to indicate a die-cutting spacing offset of the ith tab, and the second offset is used to indicate an offset between a tab spacing of the ith tab in the material winding model and a reference tab spacing; Correcting the second offset by using the first offset and the winding parameter to obtain the tab spacing offset of the i-th tab; The tab misalignment result is determined based on the tab spacing offsets respectively corresponding to a plurality of tabs in the battery core material.

3. The method according to claim 2, characterized in that The battery material also includes a diaphragm material; The obtaining of the reference tab spacing of the ith tab in the battery core material includes: Obtaining the circumference of a single winding circle in the winding circular motion; Determining a diaphragm influence factor based on the thickness of the diaphragm material according to the winding circular motion, the diaphragm influence factor being used to indicate the degree of influence of the thickness of the diaphragm material on the winding circumference in the i-layer winding of the winding process; Determining a cell influence factor based on the thickness of the cell material according to the winding circular motion, the cell influence factor being used to indicate the degree of influence of the thickness of the cell material on the winding circumference in the i-layer winding; The reference tab spacing of the ith tab is determined based on the single-turn winding circumference, the separator influence factor, and the battery cell influence factor.

4. The method according to claim 3, characterized in that The battery core material includes positive electrode material and negative electrode material; The determining of the cell impact factor based on the thickness of the cell material according to the winding circular motion comprises: Determining a negative electrode influence factor based on the thickness of the negative electrode material according to the winding circular motion, the negative electrode influence factor being used to indicate the degree of influence of the thickness of the negative electrode material on the winding circumference in the i-layer winding; Determining a positive electrode influence factor based on the thickness of the positive electrode material according to the winding circular motion, wherein the positive electrode influence factor is used to indicate the degree of influence of the thickness of the positive electrode material on the winding circumference in the i-layer winding; The cell influence factor is determined based on the negative electrode influence factor and the positive electrode influence factor.

5. The method according to claim 2, characterized in that: The battery material also includes a diaphragm material; The step of correcting the second offset by using the first offset and the winding parameter to obtain the tab spacing offset of the i-th tab comprises: Acquire a diaphragm deviation and a cell deviation based on the winding parameter and the material winding model, wherein the diaphragm deviation is used to indicate an offset of the distance between the tabs caused by a thickness deviation of the diaphragm material, and the cell deviation is used to indicate an offset of the distance between the tabs caused by a thickness deviation of the cell material; Acquire a winding needle deviation based on a winding needle radius in the winding parameters and the material winding model, wherein the winding needle deviation is used to indicate an offset of the tab spacing caused by the winding needle radius; The second offset is corrected by the first offset, the diaphragm deviation, the battery cell deviation and the winding needle deviation to obtain the tab spacing offset of the i-th tab.

6. The method according to claim 5, characterized in that The obtaining of the separator deviation and the cell deviation based on the winding parameter and the material winding model includes: Obtaining the thickness of the diaphragm material as represented by the material winding model, and the thickness of the battery core material as represented by the material winding model; Obtaining a reference diaphragm thickness of the diaphragm material in the winding parameters and a reference cell thickness of the cell material; determining the separator deviation for the i-th tab based on a difference between the separator thickness and the reference separator thickness and the material winding model; The cell deviation for the i-th tab is determined based on a difference between the cell thickness and the reference cell thickness and the material winding model.

7. The method according to claim 2, characterized in that The battery core material includes positive electrode material and negative electrode material; The step of determining the tab misalignment result based on the tab spacing offsets respectively corresponding to the plurality of tabs in the battery core material comprises: Determining a positive electrode tab misalignment result based on the positive electrode tab spacing offsets respectively corresponding to a plurality of positive electrode tabs in the positive electrode material; The negative electrode tab misalignment result is determined based on the negative electrode tab spacing offsets respectively corresponding to the multiple negative electrode tabs in the negative electrode material.

8. The method according to any one of claims 1 to 7, characterized in that: After obtaining the tab misalignment result of the battery core material based on the material winding model, the method further includes: The winding parameters are adjusted based on the tab misalignment result to obtain reference winding parameters, where the reference winding parameters are used to indicate relevant parameters of the battery material winding obtained with the goal of calibrating the tab.

9. The method according to claim 8, characterized in that The battery core material includes positive electrode material and negative electrode material, the positive electrode material includes a positive electrode tab, and the negative electrode material includes a negative electrode tab; The step of adjusting the winding parameters based on the tab misalignment result to obtain reference winding parameters includes: When the tab misalignment result indicates that the positive tab and the negative tab are misaligned at the same time, and the misalignment direction is a first direction, adjusting the winding parameter to obtain a first reference winding parameter, the first reference winding parameter is used to indicate at least one of increasing the thickness of the battery material, reducing the circumference of the winding needle, and reducing the die-cutting size, and the die-cutting size is used to indicate the size of the tab; When the tab misalignment result indicates that the positive tab and the negative tab are misaligned at the same time and the misalignment direction is a second direction, the winding parameters are adjusted to obtain second reference winding parameters, and the second reference winding parameters are used to indicate at least one of reducing the thickness of the battery cell material, increasing the circumference of the winding needle, and increasing the die-cutting size, wherein the first direction is opposite to the second direction.

10. The method according to claim 8, characterized in that After adjusting the winding parameters based on the tab misalignment result to obtain reference winding parameters, the method further includes: The tab misalignment result is automatically reacquired based on the reference winding parameter and the material winding model, and the reference winding parameter is adjusted based on the tab misalignment result until it meets the preset requirements.

11. The method according to claim 10, characterized in that The method further comprises: In the case of meeting the preset requirements, storing the reference winding parameters as candidate winding parameters in a candidate database, wherein the candidate database includes a plurality of candidate winding parameters; receiving a first winding parameter input by a user; When the first winding parameter matches the second candidate winding parameter among the multiple candidate winding parameters, recommendation information is displayed, wherein the recommendation information includes the second candidate winding parameter, the second pole lug misalignment result and the difference between the first winding parameter and the second candidate winding parameter, and the second pole lug misalignment result is the pole lug misalignment result corresponding to the second candidate winding parameter.

12. The method according to claim 8, characterized in that The method further comprises: Displaying a first three-dimensional winding model through a virtual reality device, the first three-dimensional winding model is a three-dimensional model rendered based on the winding parameters and the material winding model, and the first three-dimensional winding model is used to express a three-dimensional winding structure of the battery material formed according to the winding circular motion based on the winding parameters; receiving a simulation adjustment operation for the first three-dimensional winding model, wherein the simulation adjustment operation is used to instruct to adjust the three-dimensional winding structure of the battery material in the first three-dimensional winding model according to the reference winding parameters; Based on the simulation adjustment operation, a second three-dimensional winding model is displayed. The second three-dimensional winding model is a three-dimensional model rendered based on the reference winding parameters and the material winding model. The second three-dimensional winding model is used to represent the three-dimensional winding structure of the battery material formed according to the winding circular motion based on the reference winding parameters.

13. A battery tab misalignment detection device, characterized in that: The device comprises: An acquisition module, used for acquiring winding parameters for winding battery materials, wherein the winding parameters are used for indicating relevant parameters of winding of the battery materials, wherein the battery materials include battery core materials; The processing module is further used to obtain a material winding model, wherein the material winding model is a model for representing that the battery material forms a winding structure according to a winding circular motion, wherein the winding circular motion is used to indicate a movement trajectory of the battery material during the winding process; The processing module is also used to obtain the tab misalignment result of the battery cell material based on the winding parameters and the material winding model, and the tab misalignment result is used to indicate the tab offset between the tab winding position of the battery cell material and the reference tab position, and the reference tab position is used to provide a reference position for calibrating the tab of the battery cell material.

14. A computer device, characterized in that: The computer device includes a processor and a memory, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by the processor to implement the battery tab misalignment detection method as described in any one of claims 1 to 12.

15. A computer-readable storage medium, characterized in that: The storage medium stores at least one computer program, and the at least one computer program is loaded and executed by a processor to implement the battery tab misalignment detection method as described in any one of claims 1 to 12.

16. A computer program product, characterized in that It comprises a computer program, which, when executed by a processor, implements the battery tab misalignment detection method as claimed in any one of claims 1 to 12.

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