Pole piece winding method, device, equipment, storage medium and program product

Abstract

The application discloses a kind of pole piece winding method, device, equipment, storage medium and program product, it is related to battery technical field, comprising: the thickness data of first pole piece and the thickness data of second pole piece are obtained;Wherein, first pole piece corresponds to the pole piece area of current to be wound into battery, second pole piece corresponds to the pole piece area of last winding into battery;Based on the thickness data of first pole piece and the thickness data of second pole piece, determine winding adjustment amount;Based on winding adjustment amount, first pole piece is wound.The application can refer to the thickness data of second pole piece of last winding into battery, dynamically determine winding adjustment amount, and then first pole piece is wound based on winding adjustment amount, can effectively adapt to the thickness data of first pole piece, as far as possible avoid the battery that winding exists lug offset misplacement problem due to pole piece thickness change, reduce the unqualified product rate of entire winding process, improve production yield.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to electrode winding methods, apparatus, devices, storage media, and process products. Background Technology

[0002] In the battery manufacturing process, the winding section is one of the key process equipment. The winding section is used to wind materials such as positive electrode sheet, negative electrode sheet and separator together to form a battery cell.

[0003] However, during the winding process, the thickness of the electrode sheet may fluctuate, which may eventually lead to the position of the tabs corresponding to different cell layers being offset or misaligned, thus affecting the battery's performance and lifespan. Summary of the Invention

[0004] The main objective of this application is to provide an electrode winding method, apparatus, device, storage medium, and program product, which aims to solve the problem that the position of the tabs corresponding to different cell layers caused by electrode thickness fluctuations is misaligned, thereby affecting the performance and life of the battery.

[0005] To achieve the above objectives, this application proposes an electrode winding method, the method comprising:

[0006] Obtain the thickness data of the first electrode and the thickness data of the second electrode; wherein the first electrode corresponds to the electrode area to be wound into a battery cell, and the second electrode corresponds to the electrode area to be wound into a battery cell in the previous time.

[0007] Based on the thickness data of the first electrode and the thickness data of the second electrode, a winding adjustment amount is determined; wherein, the winding adjustment amount is used to adjust the diameter or circumference when the electrode is wound into a battery cell.

[0008] The first electrode is wound based on the winding adjustment amount.

[0009] In one embodiment, obtaining the thickness data of the first electrode and the thickness data of the second electrode includes:

[0010] Before the second electrode is wound into a battery cell, the thickness at multiple locations on the second electrode is collected, and the thickness data of the second electrode is determined based on the thickness at multiple locations on the second electrode.

[0011] Before the first electrode is wound into a battery cell, the thickness at multiple locations on the first electrode is collected, and the thickness data of the first electrode is determined based on the thickness at multiple locations on the first electrode.

[0012] This embodiment provides a specific implementation method for obtaining electrode thickness data. Specifically, before winding the second electrode into a battery cell, the thickness at multiple locations on the second electrode can be collected, and the thickness data of the second electrode can be determined based on the thickness at these multiple locations. The method for obtaining the thickness data of the first electrode is the same as that for the second electrode. Compared with only collecting the thickness at a specific location on the electrode, this application collects the thickness at multiple locations on the electrode, and then determines the thickness data corresponding to the electrode region based on these thicknesses. This can effectively avoid the difficulty in obtaining thickness data that can effectively characterize the thickness of the entire electrode due to local thickness fluctuations of the electrode. The electrode thickness data obtained by this application can better characterize the thickness of the entire electrode, which is conducive to more accurately determining the winding adjustment amount and better winding the first electrode. This avoids winding battery cells with electrode tab misalignment problems as much as possible, significantly reducing the defect rate of the entire winding process and improving the production yield.

[0013] In one embodiment, determining the winding adjustment amount based on the thickness data of the first electrode and the thickness data of the second electrode includes:

[0014] The winding adjustment amount is determined based on the difference between the thickness data of the first electrode and the thickness data of the second electrode.

[0015] This embodiment provides a specific implementation method for determining the winding adjustment amount. Specifically, the winding adjustment amount can be determined based on the difference between the thickness data of the first electrode and the thickness data of the second electrode, so that the winding adjustment amount can adapt to the fluctuation of the electrode thickness, so as to better wind the first electrode.

[0016] In one embodiment, determining the winding adjustment amount based on the difference between the thickness data of the first electrode and the thickness data of the second electrode includes:

[0017] Based on the number of tab areas on the first electrode sheet, the number of layers of the first electrode sheet to be wound into a battery cell is determined;

[0018] Based on the difference between the thickness data of the first electrode and the thickness data of the second electrode, and the number of layers to be wound into a battery cell, the winding adjustment amount is determined.

[0019] This embodiment provides a specific implementation method for determining the winding adjustment amount based on the thickness difference. Specifically, based on the fact that the thickness change of the electrode sheet affects the circumference change of the final wound cell, the number of layers of the electrode sheet to be wound into the cell is also related to the circumference change of the final wound cell. This is because, with a fixed thickness change, the more layers of the wound cell, the more turns are required. More turns will accumulate the thickness change, thus affecting the circumference change of the wound cell, resulting in a larger circumference change of the final wound cell. Therefore, when compensating for the circumference change of the cell by adjusting the winding diameter or circumference, the winding adjustment amount can be determined based on the difference in the electrode sheet thickness data and the number of layers of the first electrode sheet to be wound into the cell. This allows for more accurate compensation for the circumference change of the final wound cell, thereby improving the winding effect of the first electrode sheet, effectively alleviating the tab misalignment phenomenon of the final wound cell, significantly reducing the defect rate of the entire winding process, and improving the production yield.

[0020] In one embodiment, the thickness data of the electrode is determined by calculating the average thickness at multiple locations on the electrode.

[0021] This embodiment provides a specific implementation method for determining the thickness data of the electrode sheet. Specifically, for the first electrode sheet and the second electrode sheet, the average thickness at multiple locations on the electrode sheet can be taken as the thickness data of the electrode sheet. This avoids the difficulty in obtaining thickness data that can effectively characterize the thickness of the entire electrode sheet due to local thickness fluctuations. The average thickness at multiple locations can effectively characterize the thickness of the entire electrode sheet to a certain extent, thereby more accurately determining the difference between the thickness data of the first electrode sheet and the second electrode sheet. Based on this difference, the winding adjustment amount is determined to improve the winding effect of the first electrode sheet, effectively alleviate the tab misalignment phenomenon of the final wound cell, significantly reduce the defect rate of the entire winding process, and improve the production yield.

[0022] In one embodiment, the battery cell to be wound is formed by winding a cathode electrode, an anode electrode, and a separator together. The first electrode is either a cathode electrode or an anode electrode, and the second electrode is either a cathode electrode or an anode electrode.

[0023] This embodiment provides a specific implementation of the battery cell to be wound. Specifically, the cathode electrode, anode electrode, and separator can be wound together to form the battery cell. During the winding process, at least one of the cathode and anode electrodes can be adjusted using the above-mentioned electrode winding method to achieve a better winding effect. This can significantly reduce the defect rate of the entire winding process and improve the production yield.

[0024] In one embodiment, winding the first electrode sheet based on the winding adjustment amount includes:

[0025] Calculate the sum of the winding adjustment amounts corresponding to the cathode and anode electrodes, respectively;

[0026] Based on the sum of the winding adjustment amounts, the cathode electrode, anode electrode, and diaphragm are wound into a battery cell.

[0027] This embodiment provides a specific implementation method for winding the first electrode sheet. Specifically, during the winding process, since the above-mentioned electrode winding method can be used to determine the corresponding winding adjustment amount for at least one of the cathode electrode sheet and anode electrode sheet, after the above-mentioned electrode winding method is used to determine the corresponding winding adjustment amount for the cathode electrode sheet and anode electrode sheet, the sum of the determined winding adjustment amounts can be calculated. Based on the sum of the multiple winding adjustment amounts, the cathode electrode sheet, anode electrode sheet, and separator are wound to form a battery cell, so as to achieve a better winding effect, which can significantly reduce the defect rate of the entire winding process and improve the production yield.

[0028] In one embodiment, the winding adjustment amount is specifically used to adjust the diameter or circumference of the electrode sheet when winding it into a battery cell by adjusting the diameter or circumference of the winding portion. The winding portion is used to gradually wind the electrode sheet into a battery cell by rotating it along the axial direction.

[0029] This embodiment provides a specific implementation method for winding electrode sheets using a winding adjustment amount. Specifically, the winding adjustment amount can be adjusted by adjusting the diameter or circumference of the winding part to adjust the diameter or circumference of the electrode sheet when winding it into a battery cell. After determining the winding adjustment amount, the diameter or circumference of the winding part can be adjusted based on the winding adjustment amount. Then, by rotating the winding part along the axial direction, the electrode sheet is gradually wound into a battery cell to achieve a better winding effect.

[0030] In one embodiment, the method further includes:

[0031] If the thickness data of the electrode sheet meets at least one of the following conditions, output information indicating that the thickness of the electrode sheet is abnormal:

[0032] The average thickness at multiple locations on the electrode is within a first threshold range, where the first threshold range is a set range of abnormal average thickness.

[0033] Of the thicknesses at multiple locations on the electrode, at least some locations have thicknesses within a second threshold range, where the second threshold range is a set abnormal range for thickness.

[0034] This embodiment provides a specific implementation of thickness anomaly alerts. Specifically, during the electrode winding process, the thickness data of the electrode to be wound or being wound can be monitored online in real time. If the average thickness at multiple locations on the electrode is detected to be within a first threshold range, or if the thickness at at least some locations on the electrode is detected to be within a second threshold range, then the current electrode thickness is considered to exceed the allowable set range. At this time, information indicating an abnormal electrode thickness can be output for further processing by technicians to prevent unqualified battery cells from being wound and flowing into subsequent processes.

[0035] In one embodiment, obtaining the thickness data of the first electrode and the thickness data of the second electrode includes:

[0036] During the process of moving the electrode sheet toward the winding section to be wound into a battery cell, the thickness at different positions on the electrode sheet is collected at preset time intervals to obtain the thickness at multiple positions on the electrode sheet.

[0037] Based on the positional spacing between two adjacent tab regions on the electrode, the thickness at multiple locations on the electrode is divided into the thickness data of the first electrode and the thickness data of the second electrode.

[0038] In this embodiment, another specific implementation method for obtaining electrode thickness data is provided. Specifically, during the process of the electrode moving towards the winding section to be wound into a battery cell, the thickness at different positions on the electrode is collected at preset time intervals to obtain the thickness at multiple positions on the electrode. Since it is necessary to distinguish the thickness data of the electrode areas wound into different battery cells when determining the winding adjustment amount later, that is, it is necessary to divide the thickness data of the first electrode and the second electrode, this application can divide the continuous electrode area into the first electrode and the second electrode based on the positional distance between two adjacent tab areas on the electrode. The electrode areas corresponding to the first electrode and the second electrode are wound into different battery cells, thereby more accurately dividing the thickness at multiple positions on the electrode into the thickness data of the first electrode and the thickness data of the second electrode, which facilitates more accurate determination of the winding adjustment amount later.

[0039] In one embodiment, dividing the thickness at multiple locations on the electrode sheet into thickness data for the first electrode sheet and thickness data for the second electrode sheet based on the positional spacing between two adjacent tab regions on the electrode sheet includes:

[0040] If the distance between two adjacent tab regions on the electrode sheet is detected to be greater than a first value, a first position is determined in the electrode sheet region between the two adjacent tab regions. The first position is used to divide the electrode sheet region that needs to be wound into different cells.

[0041] Using the first position as a boundary, the thickness at multiple positions on the electrode area close to the winding part is taken as the thickness data of the second electrode, and the thickness at multiple positions on the electrode area far from the winding part is taken as the thickness data of the first electrode.

[0042] This embodiment provides a specific implementation method for dividing thickness data. Specifically, when the distance between two adjacent tab regions on the electrode sheet is detected to be greater than a first value, this is considered to be the boundary area between the first and second electrode sheets. A first position can be determined within this electrode sheet area to divide the first and second electrode sheets that need to be wound into different cells. Then, using the first position as the boundary, the thickness at multiple positions on the electrode sheet area currently close to the winding part can be used as the thickness data of the second electrode sheet, and the thickness at multiple positions on the electrode sheet area currently far from the winding part can be used as the thickness data of the first electrode sheet. This process continues until the distance between two adjacent tab regions on the electrode sheet is detected to be greater than the first value again. This application can more accurately divide the thickness data of the first and second electrode sheets, which facilitates more accurate determination of the winding adjustment amount in the future.

[0043] Furthermore, to achieve the above objectives, this application also proposes an electrode winding apparatus, the apparatus comprising:

[0044] A thickness measuring mechanism is used to acquire thickness data of the first electrode and the second electrode; wherein the first electrode corresponds to the electrode area to be wound into a battery cell, and the second electrode corresponds to the electrode area to be wound into a battery cell in the previous operation.

[0045] A controller is configured to determine a winding adjustment amount based on the thickness data of the first electrode and the thickness data of the second electrode; wherein the winding adjustment amount is used to adjust the diameter or circumference when the electrode is wound into a battery cell; and the first electrode is wound based on the winding adjustment amount.

[0046] In one embodiment, the controller is specifically used for:

[0047] Based on the winding adjustment amount, adjust the diameter or circumference of the winding section in the electrode winding device;

[0048] The adjusted winding section winds the first electrode sheet.

[0049] In addition, to achieve the above objectives, this application also proposes an electrode winding apparatus, the apparatus comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the electrode winding method described above.

[0050] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the electrode winding method described above.

[0051] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the electrode winding method described above.

[0052] One or more technical solutions proposed in this application have at least the following technical effects:

[0053] Before winding the first electrode, in order to adjust the winding diameter or circumference from the thickness data of the second electrode previously wound into a battery cell to the thickness data of the first electrode to be wound into a battery cell, this application can first obtain the thickness data of the first electrode and the thickness data of the second electrode, and then refer to the thickness data of the second electrode previously wound into a battery cell to dynamically determine the winding adjustment amount. Based on the winding adjustment amount, the first electrode is wound, which can effectively adapt to the thickness data of the first electrode and effectively alleviate the mismatch between the electrode thickness data and the winding diameter or circumference caused by electrode thickness fluctuations. This leads to the occurrence of tab misalignment in the wound cells, effectively improving battery performance and lifespan. Furthermore, compared to detecting tab misalignment in the cells only after the electrodes are wound into cells and adjusting the winding diameter or circumference based on the tab misalignment, which results in adjustment lag, this application dynamically determines and adjusts the winding adjustment amount before winding the first electrode to match the thickness data of the first electrode. This minimizes the occurrence of cells with tab misalignment, significantly reducing the defect rate of the entire winding process and improving the production yield. Attached Figure Description

[0054] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0055] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the unfolded electrode sheet in the related technology;

[0057] Figure 2 This is one of the schematic diagrams of a battery cell formed by winding electrode sheets in related technologies;

[0058] Figure 3 This is the second schematic diagram of a battery cell formed by winding electrode sheets in related technologies;

[0059] Figure 4 This is one of the flowcharts illustrating the electrode winding method provided in this application;

[0060] Figure 5 This is the second flowchart illustrating the electrode winding method provided in this application;

[0061] Figure 6 This is the third flowchart illustrating the electrode winding method provided in this application;

[0062] Figure 7 This is one of the schematic diagrams showing the application scenarios of the winding equipment in the electrode winding method provided in this application;

[0063] Figure 8 This is the second schematic diagram of the application scenario of the winding equipment in the electrode winding method provided in this application;

[0064] Figure 9 This is the fourth flowchart illustrating the electrode winding method provided in this application;

[0065] Figure 10 This is a schematic diagram illustrating the working principle of the laser thickness measuring device in the electrode winding method provided in this application;

[0066] Figure 11 This is a schematic diagram of the external structure of the winding equipment in the electrode winding method provided in this application;

[0067] Figure 12 This is a schematic diagram of the internal structure of the winding equipment in the electrode winding method provided in this application;

[0068] Figure 13 This is a schematic diagram of the electrode winding device provided in this application;

[0069] Figure 14 This is a schematic diagram of the electrode winding equipment provided in this application.

[0070] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0071] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0073] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0074] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0075] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0076] In related technologies, winding equipment is one of the key process equipment in battery manufacturing, used to wind materials such as positive electrode sheets (hereinafter also called anode sheets), negative electrode sheets (hereinafter also called cathode sheets) and separators (including upper separators and lower separators) into battery cells.

[0077] Figure 1 This is a schematic diagram of the unfolded electrode sheet in related technologies, such as... Figure 1 As shown in the figure, A is the electrode sheet, B is the tab area on the electrode sheet, and it is wound in the direction of C in the figure. It can be understood that during the winding process of the electrode sheet, the tab areas with different winding turns need to be aligned as much as possible in order to form the tabs of the final wound cell.

[0078] Figure 2 This is one of the schematic diagrams of a battery cell formed by winding electrode sheets in related technologies, such as... Figure 2The image shows a top view of a wound battery cell. In the diagram, D represents the wound cell. The tab E on the left can be understood as the cathode tab, and the tab F on the right as the anode tab. The wound cell D is formed by stacking the cathode and anode plates together and then winding them once. The cathode tab E is formed by multiple tab areas on the cathode plate being stacked together during the winding process. Similarly, the anode tab F is formed by multiple tab areas on the anode plate being stacked together during the winding process. Figure 2 This is a top view of the wound battery cell. It can be assumed that in this case, the multiple tab areas are not misaligned and are aligned after winding. This battery cell can be considered a standard battery cell, which has better performance and a longer service life.

[0079] Figure 3 This is the second schematic diagram of a battery cell formed by winding electrode sheets in related technologies, such as... Figure 3 The image shown is a top view of a wound battery cell. Figure 2 Similarly, for the cathode tab E and anode tab F of this battery cell, multiple tab areas have shifted and misaligned after winding. The figure only shows an example of single-sided misalignment. Single-sided misalignment means that the multiple tab areas of the cathode tab E and anode tab F are shifted and misaligned in the same direction. The shifting and misalignment can also be a figure-eight misalignment, a U-shaped misalignment, or other conventional misalignment, which will not be elaborated here. The shifting and misalignment of the tabs will reduce the performance of the wound battery cell and shorten its service life.

[0080] In actual production, the thickness of the electrode sheet may fluctuate during the winding process, which may lead to the aforementioned electrode tab misalignment, thus affecting the performance and lifespan of the cell and even the battery.

[0081] Traditional solutions typically involve offline testing of the wound cells after winding, specifically detecting whether there is tab misalignment. If misalignment is found, the winding equipment is adjusted based on the amount of misalignment. However, this traditional method cannot monitor changes in electrode thickness in real time, potentially leading to defective products entering subsequent processes. Furthermore, the fixed diameter of the winding needles in traditional winding equipment prevents dynamic adjustment based on electrode thickness variations, further exacerbating the tab misalignment problem.

[0082] To address the aforementioned technical problems, this application provides an electrode winding method, which aims to effectively solve the problem of electrode tab misalignment caused by thickness fluctuations by measuring the electrode thickness in real time and dynamically adjusting the winding diameter or circumference according to thickness changes.

[0083] It should be noted that the executing entity of the embodiments of this application can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of performing the above functions. The embodiments of this application and the following examples will be described using an electronic device as an example.

[0084] According to one aspect, embodiments of this application provide an electrode winding method, referring to... Figure 4 , Figure 4 This is one of the flowcharts illustrating the electrode winding method provided in this application, which includes steps S401 to S403:

[0085] Step S401: Obtain the thickness data of the first electrode and the thickness data of the second electrode;

[0086] Wherein, the first electrode corresponds to the electrode region currently to be wound into a battery cell, and the second electrode corresponds to the electrode region previously wound into a battery cell. The first electrode can be either a cathode electrode or an anode electrode, and the second electrode can be either a cathode electrode or an anode electrode.

[0087] It should be noted that the aforementioned electrode thickness data includes, for example, the thickness collected at a specific location within the electrode region, the thickness collected at multiple locations within the electrode region, and the data after processing the thickness collected at multiple locations, such as the average and variance of the thickness collected at multiple locations, used to characterize the overall thickness within the electrode region. This application does not impose any restrictions on this.

[0088] Optionally, the thickness data of the electrode can be obtained by laser thickness measurement technology. For example, a laser thickness measurement device can be added to the winding process to collect and calculate the thickness data of the electrode in advance before winding. Laser thickness measurement technology adopts a non-contact measurement method, which avoids physical contact with the electrode and reduces the possibility of material damage.

[0089] Step S402: Determine the winding adjustment amount based on the thickness data of the first electrode and the thickness data of the second electrode;

[0090] The winding adjustment amount is used to adjust the diameter or circumference when the electrode sheet is wound into a battery cell.

[0091] Step S403: Based on the winding adjustment amount, the first electrode sheet is wound.

[0092] It should be noted that the above-mentioned winding adjustment amount can be understood as the change in circumference caused by the winding part winding one turn. The winding adjustment amount can be adjusted by adjusting the diameter or circumference of the winding part (e.g., the winding needle). The winding needle used in the embodiments of this application can be a variable diameter winding needle, which can achieve the adjustment of diameter or circumference through a hydraulic or electric drive device.

[0093] It should also be noted that the winding equipment may include a winding section, which is used to wind the electrode sheet into a battery cell. Since the winding section has previously wound the second electrode sheet, it can be assumed that the relevant parameters of the current winding section are adapted to the thickness data of the second electrode sheet. Therefore, this application can use the thickness data of the second electrode sheet as a reference to adjust the winding section so that it is adapted to the thickness data of the first electrode sheet.

[0094] Alternatively, the winding portion described above may be, for example, a winding needle in a winding device.

[0095] For example, the offset of the electrode tabs of the battery cell previously wound using the second electrode can also be detected first:

[0096] 1) If the offset of the electrode tab is within the allowable error range in actual production, it is considered that the thickness data of the second electrode sheet wound in the previous winding is compatible with the relevant parameters of the current winding section. At this time, the thickness data of the second electrode sheet can be used as a reference to adjust the winding section so that the adjusted winding section can be compatible with the thickness data of the first electrode sheet to be wound.

[0097] 2) If the offset of the tab is not within the allowable error range in actual production, that is, the tab offset also occurred during the previous winding of the second electrode, a prompt message can be output to prompt the technicians to handle the tab offset. This avoids using mismatched thickness data as a reference to adjust the winding section, which could lead to problems with the subsequently wound cells. This can significantly reduce the defect rate of the entire winding process and improve the production yield.

[0098] Alternatively, a specific implementation method for winding the electrode sheet using a winding adjustment amount is provided.

[0099] The winding adjustment amount can be specifically used to adjust the diameter or circumference of the electrode sheet when winding it into a battery cell by adjusting the diameter or circumference of the winding part. The winding part is used to gradually wind the electrode sheet into a battery cell by rotating it along the axial direction.

[0100] Specifically, the aforementioned winding adjustment amount can be adjusted by adjusting the diameter or circumference of the winding part to adjust the diameter or circumference when winding the electrode into a battery cell. After determining the winding adjustment amount, the diameter or circumference of the winding part can be adjusted based on the winding adjustment amount, and then the winding part can be used to gradually wind the electrode into a battery cell by rotating along the axial direction to achieve a better winding effect.

[0101] In the electrode winding method provided in this application embodiment, before winding the first electrode, in order to adjust the winding diameter or circumference from the thickness data of the second electrode that was previously wound into a battery cell to the thickness data of the first electrode to be wound into a battery cell, this application can first obtain the thickness data of the first electrode and the thickness data of the second electrode, and then refer to the thickness data of the second electrode that was previously wound into a battery cell to dynamically determine the winding adjustment amount, and then wind the first electrode based on the winding adjustment amount. This can effectively adapt to the thickness data of the first electrode and can effectively alleviate the problem of electrode thickness fluctuations causing the electrode thickness data to be inconsistent with the winding diameter. Mismatched diameter or circumference can lead to electrode misalignment in the wound cells, effectively improving battery performance and lifespan. Furthermore, compared to detecting electrode misalignment only after the electrode sheets are wound into cells and adjusting the winding diameter or circumference based on the misalignment, which results in adjustment lag, this application dynamically determines and adjusts the winding adjustment amount before winding the first electrode sheet to match its thickness data. This minimizes the risk of winding cells with electrode misalignment, significantly reducing the overall defect rate and improving the production yield.

[0102] The following describes the specific implementation method for obtaining electrode thickness data, using feasible implementation methods as an example:

[0103] In one feasible implementation, Figure 5 This is the second flowchart illustrating the electrode winding method provided in this application, as shown below. Figure 5 As shown, in Figure 4 Based on this, step S401 above may include the following steps:

[0104] Step S4011: Before winding the second electrode into a battery cell, the thickness at multiple locations on the second electrode is collected, and the thickness data of the second electrode is determined based on the thickness at multiple locations on the second electrode.

[0105] Step S4012: Before winding the first electrode sheet into a battery cell, the thickness at multiple locations on the first electrode sheet is collected, and the thickness data of the first electrode sheet is determined based on the thickness at multiple locations on the first electrode sheet.

[0106] It should be noted that the embodiments of this application do not limit the order in which steps S4011 and S4012 are performed; this is only an example.

[0107] Optionally, the thickness data of the electrode can be determined by calculating the average thickness at multiple locations on the electrode.

[0108] Specifically, for the first and second electrodes, the average thickness at multiple locations on the electrode can be taken as the electrode thickness data. This avoids the difficulty in obtaining thickness data that can effectively characterize the entire electrode thickness due to local thickness fluctuations. The average thickness at multiple locations can effectively characterize the thickness of the entire electrode to a certain extent, thereby more accurately determining the difference between the thickness data of the first and second electrodes. Based on this difference, the winding adjustment amount can be determined to improve the winding effect of the first electrode, effectively alleviate the electrode tab misalignment phenomenon of the final wound cell, significantly reduce the defect rate of the entire winding process, and improve the production yield.

[0109] For example, step S4011 can be executed first, followed by step S4012. Taking the example of using a laser thickness measuring device to sequentially collect and calculate the thickness of the electrode sheets at different positions on a winding process production line, the laser thickness measuring device can first collect the thickness at multiple positions on the second electrode sheet that needs to be wound first, and calculate the average value as the thickness data of the second electrode sheet. Then, the laser thickness measuring device can collect the thickness at multiple positions on the first electrode sheet that needs to be wound later, and calculate the average value as the thickness data of the first electrode sheet. This is just an example of a specific application scenario, and this application does not limit it.

[0110] Specifically, before winding the second electrode into a cell, the thickness at multiple locations on the second electrode can be collected, and the thickness data of the second electrode can be determined based on the thickness at these multiple locations. The method for obtaining the thickness data of the first electrode is the same as that for the second electrode. Compared with only collecting the thickness at a specific location on the electrode, this application collects the thickness at multiple locations on the electrode, and then determines the thickness data corresponding to the electrode area based on these thicknesses. This can effectively avoid the difficulty in obtaining thickness data that can effectively characterize the thickness of the entire electrode due to local thickness fluctuations of the electrode. The thickness data of the electrode obtained by this application can better characterize the thickness of the entire electrode, which is conducive to more accurately determining the winding adjustment amount and better winding the first electrode. This avoids winding cells with electrode tab misalignment problems as much as possible, significantly reducing the defect rate of the entire winding process and improving the production yield.

[0111] In another feasible implementation, step S401 above may include the following steps:

[0112] Step S4014: During the process of moving the electrode sheet toward the winding section to wind it into a battery cell, the thickness of different positions on the electrode sheet is collected at preset time intervals to obtain the thickness at multiple positions on the electrode sheet.

[0113] Step S4014: Based on the positional spacing between two adjacent tab regions on the electrode sheet, the thickness at multiple locations on the electrode sheet is divided into the thickness data of the first electrode sheet and the thickness data of the second electrode sheet.

[0114] Specifically, during the process of the electrode sheet moving towards the winding section to be wound into a battery cell, the thickness at different positions on the electrode sheet can be collected at preset time intervals to obtain the thickness at multiple positions on the electrode sheet. Since it is necessary to distinguish the thickness data of the electrode sheet regions wound into different battery cells when determining the winding adjustment amount later, that is, it is necessary to divide the thickness data of the first electrode sheet and the second electrode sheet, this application can divide the continuous electrode sheet region into the first electrode sheet and the second electrode sheet based on the positional distance between two adjacent tab regions on the electrode sheet. The electrode sheet regions corresponding to the first electrode sheet and the second electrode sheet are wound into different battery cells, thereby more accurately dividing the thickness at multiple positions on the electrode sheet into the thickness data of the first electrode sheet and the thickness data of the second electrode sheet, which facilitates more accurate determination of the winding adjustment amount later.

[0115] Optionally, step S4014 above may include the following steps:

[0116] Step S4014-1: When the distance between two adjacent tab regions on the electrode sheet is detected to be greater than a first value, a first position is determined in the electrode sheet region between the two adjacent tab regions. The first position is used to divide the electrode sheet region that needs to be wound into different cells.

[0117] Step S4014-2: Using the first position as the boundary, the thickness at multiple positions on the electrode area near the winding part is taken as the thickness data of the second electrode, and the thickness at multiple positions on the electrode area away from the winding part is taken as the thickness data of the first electrode.

[0118] Specifically, when the distance between two adjacent tab regions on the electrode is detected to be greater than a first value, this is considered to be the boundary area between the first and second electrodes. A first position can be determined within this electrode area to divide the first and second electrodes that need to be wound into different cells. Then, using the first position as the boundary, the thickness at multiple positions on the electrode area currently close to the winding part can be used as the thickness data of the second electrode, and the thickness at multiple positions on the electrode area currently far from the winding part can be used as the thickness data of the first electrode. This process continues until the distance between two adjacent tab regions on the electrode is detected to be greater than the first value again. This application can more accurately divide the thickness data of the first and second electrodes, making it easier to determine the winding adjustment amount more accurately in the future.

[0119] The following describes the specific implementation method for determining the winding adjustment amount, using feasible implementation methods as an example:

[0120] In one feasible implementation, step S402 above may include:

[0121] Step S4021: Determine the winding adjustment amount based on the difference between the thickness data of the first electrode and the thickness data of the second electrode.

[0122] Specifically, the winding adjustment amount can be determined based on the difference between the thickness data of the first electrode and the thickness data of the second electrode, so that the winding adjustment amount can adapt to the fluctuation of the electrode thickness, so as to better wind the first electrode.

[0123] In another feasible implementation, a specific method for determining the winding adjustment amount based on the thickness difference is provided. Step S4021 above may include the following steps:

[0124] Step S1-1: Based on the number of tab regions on the first electrode sheet, determine the number of layers of the first electrode sheet to be wound into a battery cell.

[0125] Step S1-2: Based on the difference between the thickness data of the first electrode and the thickness data of the second electrode, and the number of layers to be wound into a battery cell, determine the winding adjustment amount.

[0126] For example, assuming that the number of layers of the first electrode to be wound into a cell is determined to be N, the difference in the above thickness data ,in, This refers to the thickness data of the first electrode. Given the thickness data of the second electrode sheet, the following derivation process for determining the winding adjustment amount can be obtained:

[0127] For each layer that is wound, the change in perimeter due to the thickness difference can be calculated using the formula for calculating perimeter as follows:

[0128] First layer: 0;

[0129] Second layer: 2 pi ;

[0130] Third layer: 2 pi 2; ......

[0131] Nth level: 2 pi (N-1).

[0132] Therefore, the total change in circumference S of the N-layer wound cell due to the thickness difference can be calculated as follows:

[0133] S = 0 + 2 pi +2 pi 2 +......+ 2 pi (N-1)

[0134] = 2 pi N (N-1) / 2

[0135] = pi N (N-1).

[0136] By further distributing the total circumference change S equally among each layer wound, the required winding adjustment S' for each turn can be obtained:

[0137] S' = S / N = pi N (N-1) / N = pi (N-1).

[0138] After adjusting the winding section using the determined winding adjustment amount S', the adjusted winding section can be adapted to the thickness data of the first electrode sheet to be wound. .

[0139] Optionally, based on the calculation formula corresponding to S' above, a diameter variation coefficient K can be multiplied. This coefficient can be determined based on actual conditions through testing or other methods, for example, set to 0.6, to more accurately characterize the amount of winding adjustment required for each turn of the winding needle in the winding section through S'. After considering this coefficient, S' is calculated as follows:

[0140] S'= K pi (N-1).

[0141] In this embodiment, based on the influence of electrode thickness variation on the final circumference variation of the wound cell, the number of layers of the electrode to be wound into the cell is also related to the final circumference variation of the wound cell. This is because, given a fixed thickness variation, the more layers of the wound cell, the more turns are required. More turns accumulate thickness variation, thus affecting the circumference variation of the wound cell, resulting in a larger final circumference variation. Therefore, when compensating for the circumference variation of the cell by adjusting the winding diameter or circumference, the winding adjustment amount can be determined based on the difference in electrode thickness data and the number of layers of the first electrode to be wound into the cell. This allows for more accurate compensation of the final circumference variation of the wound cell, thereby improving the winding effect on the first electrode, effectively mitigating the tab misalignment phenomenon of the final wound cell, significantly reducing the defect rate of the entire winding process, and improving the production yield.

[0142] In some embodiments, a specific implementation of the battery cell to be wound is provided.

[0143] The battery cell to be wound can be formed by winding together a cathode electrode, an anode electrode, and a separator (including an upper separator and a lower separator). The first electrode can be either a cathode electrode or an anode electrode, and the second electrode can be either a cathode electrode or an anode electrode.

[0144] Specifically, the cathode electrode, anode electrode, and separator (including upper and lower separators) can be wound together to form a battery cell. During the winding process, the above-mentioned electrode winding method can be used to determine the corresponding winding adjustment amount for at least one of the cathode electrode and anode electrode to achieve a better winding effect. This can significantly reduce the defect rate of the entire winding process and improve the production yield.

[0145] Optionally, the battery cell to be wound can also be wound into a battery cell by flexibly adding or removing any materials based on the cathode electrode, anode electrode, upper diaphragm and lower diaphragm. This application is only an example and does not impose any restrictions.

[0146] In some embodiments, a specific implementation of winding the first electrode sheet is provided. Step S403 above includes the following steps:

[0147] Step S4031: Calculate the sum of the winding adjustment amounts corresponding to the cathode and anode plates respectively;

[0148] Step S4032: Based on the sum of the winding adjustment amounts, the cathode electrode, anode electrode, and separator are wound into a battery cell.

[0149] Specifically, during the winding process, since the winding adjustment amount can be determined for any material in the cathode or anode electrode using the above-mentioned electrode winding method, after the winding adjustment amount is determined for the cathode and anode electrodes using the above-mentioned electrode winding method, the sum of the determined winding adjustment amounts can be calculated. Based on the sum of the multiple winding adjustment amounts, the cathode electrode, anode electrode, and separator are wound to form a battery cell, so as to achieve a better winding effect. This can significantly reduce the defect rate of the entire winding process and improve the production yield.

[0150] Optionally, Figure 6 This is the third flowchart illustrating the electrode winding method provided in this application, as shown below. Figure 6 As shown, in Figure 4 Based on this, step S403 above includes the following steps:

[0151] Step S4031: Based on the winding adjustment amount and the transmission ratio between the winding part and the servo mechanism, determine the adjustment amount of the transmission position of the servo mechanism.

[0152] The transmission position of the servo mechanism is related to the diameter or circumference of the winding part.

[0153] Step S4032: After adjusting the transmission position of the servo mechanism based on the adjustment amount of the transmission position, the adjusted servo mechanism drives the winding part to wind the first pole piece.

[0154] For example, based on the winding adjustment amount S' determined in the above embodiments, the adjustment amount of the transmission position of the servo mechanism can be calculated. L is as follows:

[0155] L=S' / n= K pi (N-1) / n;

[0156] Where n represents the transmission ratio between the circumference of the coiling needle and the transmission position of the servo mechanism, for example, it is set to 2.5.

[0157] Then, using the above calculations By adjusting the transmission position of the servo mechanism, the adjusted winding section can be adapted to the thickness data of the first electrode sheet to be wound. .

[0158] In this embodiment, the winding diameter or circumference can be directly adjusted by the determined winding adjustment amount. In addition, some winding diameters or circumferences need to be indirectly adjusted by a servo mechanism that drives the winding part. For these winding parts, after determining the winding adjustment amount for the winding part, the adjustment amount of the transmission position of the servo mechanism can be determined based on the winding adjustment amount and the transmission ratio between the winding part and the servo mechanism. It is assumed that after the servo mechanism adjusts according to the determined adjustment amount of the transmission position, it will drive to the winding part, so that the winding part is driven to adjust the winding adjustment amount to match the thickness data of the first electrode to be wound. This can improve the winding effect of the adjusted winding part on the first electrode, effectively alleviate the electrode tab misalignment phenomenon of the final wound cell, significantly reduce the defect rate of the entire winding process, and improve the production yield.

[0159] Exemplary means may also be used to adjust the winding diameter or circumference, which are merely examples in this application and are not intended to be limiting.

[0160] Optionally, a specific implementation method for dividing the first electrode and the second electrode is provided, which may include the following steps:

[0161] Step S2-1: When the first electrode and the second electrode are located on the same roll of target electrode, determine the positions of all tab regions on the target electrode.

[0162] Step S2-2: Based on the positions of all the electrode regions, determine at least one group of target electrode regions; wherein, the target electrode region group includes two adjacent electrode regions, and the positional distance between the two adjacent electrode regions is greater than a first value;

[0163] Step S2-3: Based on the position of the at least one group of target electrode regions on the target electrode, determine the cutting position for cutting the first electrode and the second electrode.

[0164] Specifically, in the actual battery cell winding process, there are situations where multiple battery cells are wound from the same roll of electrode sheets. Different sections of this roll of electrode sheets correspond to different battery cells. During the electrode sheet winding process, after the electrode sheet area corresponding to the previous battery cell is wound, the electrode sheet can be cut using a cutter in a slitting device, and then the electrode sheet area corresponding to the next battery cell can be continuously wound to improve the battery cell winding efficiency. When cutting the second electrode sheet from the previous winding and the first electrode sheet to be wound, the tab area on this roll of electrode sheets can be detected first. Regarding the location, in order to effectively distinguish the electrode areas corresponding to two adjacent cells, a large interval is usually set between the last tab area of ​​the electrode corresponding to the previous cell and the first tab area of ​​the electrode corresponding to the next cell. Therefore, this application can detect the interval between adjacent tab areas. If the interval is greater than a first value, the two tab areas are considered as a group of target tab areas. The cutting position can be determined between the two tab areas to cut off the first electrode and the second electrode. This cutting method has high accuracy and efficiency.

[0165] Optionally, in the embodiments of this application, the cutting position of the first electrode and the second electrode can also be indicated by marking on the electrode. This application is only illustrative and does not limit the scope of the invention.

[0166] The following describes the specific implementation method of thickness anomaly alerts, using feasible implementation methods as an example:

[0167] In one feasible implementation, the above method further includes the following steps:

[0168] Step S3-1: If the thickness data of the electrode sheet is detected to meet at least one of the following conditions, output information indicating that the thickness of the electrode sheet is abnormal:

[0169] 1) The average thickness at multiple locations on the electrode sheet is within a first threshold range, where the first threshold range is a set abnormal range of the average thickness.

[0170] 2) Among the thicknesses at multiple locations on the electrode, the thicknesses at at least some locations are within a second threshold range, where the second threshold range is a set abnormal range of thickness.

[0171] It should be noted that the first threshold range and the second threshold range mentioned above can be set according to the actual situation. When the average thickness at multiple locations on the electrode is detected to be within the first threshold range, the thickness of the electrode is considered to be abnormal. Similarly, when the thickness at a location on the electrode is detected to be within the second threshold range, the thickness of the electrode is considered to be abnormal. This application does not limit the specific setting values ​​of the first threshold range and the second threshold range.

[0172] Specifically, during the electrode winding process, the thickness data of the electrode to be wound or being wound can be monitored online in real time. If the average thickness at multiple locations on the electrode is detected to be within the first threshold range, or if the thickness at at least some locations on the electrode is detected to be within the second threshold range, then the thickness of the current electrode is considered to exceed the allowable set range. At this time, information indicating that the thickness of the electrode is abnormal can be output for technicians to further process, so as to prevent unqualified battery cells from being wound and flowing into subsequent processes.

[0173] The following example illustrates the electrode winding method provided in this application. This method combines online thickness measurement technology and variable diameter winding needle control to solve the problem of electrode tab misalignment caused by changes in electrode thickness during electrode winding.

[0174] Currently, when producing large-size thick cells (≥40 layers), the amount of cell misalignment increases due to the thickness fluctuation of cold-pressed electrode sheets and the rebound of vertical storage. Moreover, the misalignment before and after rewinding and yellow labeling accounts for about 60% of the total misalignment.

[0175] Traditional solutions typically involve offline testing of the previously wound cells before electrode winding begins, using the amount of tab misalignment to predict and adjust the diameter or circumference of the winding needle. However, offline testing results in low winding efficiency, and it doesn't consider the thickness difference between the previously wound electrode and the current electrode to be wound, assuming they are the same thickness. Therefore, even if the diameter or circumference of the winding needle is adjusted, it may not be able to properly fit the thickness data of the current electrode, easily leading to tab misalignment. This prevents a closed loop from forming for cells before and after rewinding, resulting in a high defect rate and low yield rate in the entire winding process.

[0176] Although manual rubbing and other methods can alleviate some of the electrode misalignment, the consistency is uncontrollable, which increases the risk of CTS (Cell to System), such as wrinkles, gaps, and OH.

[0177] This application's embodiments reveal that the offset of the electrode tab is highly correlated with the thickness of the cell electrode sheet, and the offset amount = pi N (N-1), where N is the number of cell layers. This represents the thickness difference between the previous and current electrode sheets to be wound. Since the electrode thickness varies significantly between different rolls, to more accurately and effectively address the misalignment issue of the first cell's electrode tab during roll changes, the electrode thickness of the first cell can be detected online and then adjusted using variable diameter winding needle technology.

[0178] Figure 7This is one of the schematic diagrams illustrating the application scenario of the winding equipment in the electrode winding method provided in this application, such as... Figure 7 As shown in the figure, the case of stacking and winding the cathode and anode plates together is used as an example. The figure shows two branches, one for the cathode plate and one for the anode plate.

[0179] Figure 8 This is the second schematic diagram illustrating the application scenario of the winding equipment in the electrode winding method provided in this application, as shown below. Figure 8 As shown, taking the case where the cathode electrode, upper diaphragm, anode electrode, and lower diaphragm are stacked together and wound together as an example, the figure shows branches corresponding to the cathode electrode, upper diaphragm, anode electrode, and lower diaphragm, for a total of 4 branches.

[0180] For the cathode electrode branch, the cathode electrode unwinding mechanism first unwinds the cathode electrode to be wound. After being unwound, the cathode electrode is wound up by the winding needle on the other side. Therefore, the cathode electrode passes through the laser thickness measuring device and the tab spacing detection device as it is wound up. The laser thickness measuring device measures the thickness of the cathode electrode in real time with its laser emitter and receiver and transmits the data to the control system. The tab spacing detection device can detect the spacing of the tab area on the cathode electrode to determine the cutting position on the cathode electrode. Then, the cathode electrode passes through the encoder, which records the current position of the cathode electrode being transported. When the cutting position of the cathode electrode is detected to reach the cathode cutter, the control system controls the cathode cutter to cut the cathode electrode. After the winding needle completes the winding of the previous cell, it winds the next segment of the electrode after the cutting. Similarly, the anode electrode branch, the upper diaphragm branch, and the lower diaphragm branch can also be wound in a similar process. The four branches are wound simultaneously to finally wind the required cell.

[0181] During continuous winding, the winding equipment winds the four materials according to the process using winding needles. For the above-mentioned electrode winding method, the cathode electrode branch and the anode electrode branch can be used in the above four branches to ensure that the alignment of the wound cathode and anode electrodes is within a certain specification range.

[0182] Figure 9 This is the fourth flowchart illustrating the electrode winding method provided in this application, as shown below. Figure 9 As shown, for the winding of the cathode electrode branch and the anode electrode branch in the above four branches, after the winding begins, it is first detected whether the head of the cathode electrode and the anode electrode appears. Here, the head can be determined by the interval of the tab area on the electrode.

[0183] If the head of the cathode electrode is detected, the cathode electrode thickness is measured in real time. For example, the electrode thickness is collected once after an interval length d, and the average thickness m1 of the thickness collected at the i-th interval length d is calculated. After the head of the next cathode electrode is detected, the total average thickness m2 of the cathode electrode segment can be determined based on m1, and the data m2 is pushed onto array A to represent the thickness data of the cathode electrode.

[0184] The same principle applies to the cathode electrode. The average thickness n2 of the final anode electrode segment can be obtained and pushed onto array B to represent the thickness data of the anode electrode.

[0185] After the current segment of the electrode is wound, if it is necessary to stack the cathode and anode electrodes together for winding, the average thickness m2 of the cathode electrode and the average thickness n2 of the anode electrode corresponding to the segment of the electrode to be wound can be obtained simultaneously from array A and array B. These values ​​are then subtracted from the average thickness of the cathode electrode and the average thickness of the anode electrode in the previous winding by the winding needle. Based on the thickness difference, the diameter or circumference of the winding needle is adjusted. The winding adjustment amount of the winding needle at this time needs to take into account the winding adjustment amount corresponding to the cathode electrode and the winding adjustment amount corresponding to the anode electrode to ensure that the alignment of the cathode and anode electrodes of the wound cell is within a certain specification range.

[0186] The following is a brief explanation of the principle of laser thickness measurement equipment:

[0187] For laser thickness measurement equipment, it can be installed at the unwinding point of the winding equipment. The laser emitter and receiver of the laser thickness measurement equipment can then measure the thickness of the electrode sheet in real time and transmit the data to the control system. Figure 10 This is a schematic diagram illustrating the working principle of the laser thickness measuring device in the electrode winding method provided in this application, as shown below. Figure 10 As shown, the laser thickness measurement device includes a laser emitter, a laser receiver, and a signal processing module (not shown in the figure). A set of laser emitters and laser receivers are set on the upper and lower sides of the electrode, respectively. Taking the set of laser emitters and laser receivers on the upper side as an example, after the upper laser emitter emits a laser beam towards the electrode, the laser beam is reflected back to the laser receiver after reaching the electrode. The distance x1 between the upper laser emitter and laser receiver and the electrode can be determined by determining the time interval between the time when the laser receiver receives the laser beam and the time when the laser emitter emits the laser beam. Similarly, the distance x2 between the lower laser emitter and laser receiver and the electrode can be measured. Since the distance y between the upper and lower laser emitters and laser receivers is known, the thickness of the electrode is y-x1-x2.

[0188] In other embodiments, the laser emitter of the laser thickness measuring device can emit a laser beam, which is received by a laser receiver after passing through the electrode. The signal processing module can calculate the thickness of the electrode based on the changes in the laser signal.

[0189] During real-time monitoring of electrode thickness, if the electrode thickness is detected to exceed the set range, the control system can issue an alarm or prompt message to remind the operator to make adjustments or stop the machine directly to prevent unqualified materials from entering subsequent processes.

[0190] The structure of the winding equipment is briefly described below:

[0191] Figure 11 This is a schematic diagram of the external structure of the winding equipment in the electrode winding method provided in this application, as shown below. Figure 11 As shown, P is a winding needle. The electrode sheet is wrapped around the circumference of the winding needle P. The positions of the final wound cathode tab E and anode tab F are shown in the example. The winding needle P can include two semi-circular winding components. Specifically, the diameter or circumference of the winding needle P can be adjusted by adjusting the spacing between these two winding components.

[0192] also, Figure 12 This is a schematic diagram of the internal structure of the winding equipment in the electrode winding method provided in this application, as shown below. Figure 12 As shown, the diameter or circumference of the winding needle P can be adjusted by changing the transmission position of the servo mechanism. Specifically, after the transmission position of the servo mechanism changes, the wedge-shaped groove between the servo mechanism and the winding needle P will slide, thereby adjusting the diameter or circumference of the winding needle P. This application is only an example and does not impose any limitations.

[0193] The method described in this application has the following main advantages:

[0194] 1) Real-time monitoring: Online laser thickness measurement equipment monitors electrode thickness in real time, promptly detecting thickness anomalies and preventing defective products from entering subsequent processes. This avoids the lag of traditional offline inspection, reduces rework and scrap handling time, simplifies the thickness measurement process, and reduces the complexity of manual operation. Furthermore, laser thickness measurement technology offers high precision and sensitivity, enabling rapid and accurate measurement of electrode thickness changes. This improves the reliability of the measurement data, providing an accurate basis for subsequent dynamic adjustments. The measurement data can also be transmitted to the control system in real time, ensuring the timeliness and effectiveness of dynamic adjustments.

[0195] 2) Dynamic adjustment: The diameter or circumference of the winding needle is dynamically adjusted according to the thickness data of the electrode sheet, which effectively solves the problem of electrode tab offset and misalignment caused by thickness fluctuation and improves the accuracy of electrode tab position during winding.

[0196] 3) Improve yield: Through real-time monitoring and dynamic adjustment, the need for manual intervention is reduced, significantly improving winding quality and production efficiency, enhancing the winding consistency of battery cells, significantly reducing the defect rate, and increasing the production yield.

[0197] 4) Intelligent control: Combined with an automated control system, it realizes a fully automated process from thickness detection to needle adjustment, and also realizes intelligent monitoring and adjustment of the winding process, which effectively improves the intelligence level of winding equipment and product quality, and has broad application prospects.

[0198] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the electrode winding method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0199] On the other hand, this application also provides an electrode winding device, please refer to... Figure 13 , Figure 13 This is a schematic diagram of the electrode winding equipment provided in this application. The electrode winding equipment includes:

[0200] Thickness measuring mechanism 1301 is used to acquire thickness data of the first electrode and thickness data of the second electrode; wherein the first electrode corresponds to the electrode area to be wound into a battery cell, and the second electrode corresponds to the electrode area to be wound into a battery cell in the previous time.

[0201] The controller 1302 is used to determine a winding adjustment amount based on the thickness data of the first electrode and the thickness data of the second electrode; wherein the winding adjustment amount is used to adjust the diameter or circumference when the electrode is wound into a battery cell; and the first electrode is wound based on the winding adjustment amount.

[0202] In some embodiments, the thickness measuring mechanism 1301 is specifically used for:

[0203] Before the second electrode is wound into a battery cell, the thickness at multiple locations on the second electrode is collected, and the thickness data of the second electrode is determined based on the thickness at multiple locations on the second electrode.

[0204] Before the first electrode is wound into a battery cell, the thickness at multiple locations on the first electrode is collected, and the thickness data of the first electrode is determined based on the thickness at multiple locations on the first electrode.

[0205] In some embodiments, the controller 1302 is specifically configured to: determine a winding adjustment amount based on the difference between the thickness data of the first electrode and the thickness data of the second electrode.

[0206] In some embodiments, the controller 1302 is further configured to:

[0207] Based on the number of tab areas on the first electrode sheet, the number of layers of the first electrode sheet to be wound into a battery cell is determined;

[0208] Based on the difference between the thickness data of the first electrode and the thickness data of the second electrode, and the number of layers to be wound into a battery cell, the winding adjustment amount is determined.

[0209] In some embodiments, the thickness data of the electrode is determined by calculating the average thickness at multiple locations on the electrode.

[0210] In some embodiments, the battery cell to be wound is formed by winding together a cathode electrode, an anode electrode, and a separator (including an upper separator and a lower separator), wherein the first electrode is either a cathode electrode or an anode electrode, and the second electrode is either a cathode electrode or an anode electrode.

[0211] In some embodiments, the controller 1302 is further configured to:

[0212] Calculate the sum of the winding adjustment amounts corresponding to the cathode and anode electrodes, respectively;

[0213] Based on the sum of the winding adjustments, the cathode electrode, anode electrode, and separator (including the upper separator and the lower separator) are wound into a battery cell.

[0214] In some embodiments, the winding adjustment amount is specifically used to adjust the diameter or circumference of the electrode sheet when winding it into a battery cell by adjusting the diameter or circumference of the winding portion, wherein the winding portion is used to gradually wind the electrode sheet into a battery cell by rotating it along the axial direction.

[0215] In some embodiments, the controller 1302 is further configured to:

[0216] If the thickness data of the electrode sheet meets at least one of the following conditions, output information indicating that the thickness of the electrode sheet is abnormal:

[0217] The average thickness at multiple locations on the electrode is within a first threshold range, where the first threshold range is a set range of abnormal average thickness.

[0218] Of the thicknesses at multiple locations on the electrode, at least some locations have thicknesses within a second threshold range, where the second threshold range is a set abnormal range for thickness.

[0219] In some embodiments, the thickness measuring mechanism 1301 is further specifically used for:

[0220] During the process of moving the electrode sheet toward the winding section to be wound into a battery cell, the thickness at different positions on the electrode sheet is collected at preset time intervals to obtain the thickness at multiple positions on the electrode sheet.

[0221] Based on the positional spacing between two adjacent tab regions on the electrode, the thickness at multiple locations on the electrode is divided into the thickness data of the first electrode and the thickness data of the second electrode.

[0222] In some embodiments, the thickness measuring mechanism 1301 is further specifically used for:

[0223] If the distance between two adjacent tab regions on the electrode sheet is detected to be greater than a first value, a first position is determined in the electrode sheet region between the two adjacent tab regions. The first position is used to divide the electrode sheet region that needs to be wound into different cells.

[0224] Using the first position as a boundary, the thickness at multiple positions on the electrode area close to the winding part is taken as the thickness data of the second electrode, and the thickness at multiple positions on the electrode area far from the winding part is taken as the thickness data of the first electrode.

[0225] The electrode winding equipment provided in this application, employing the electrode winding method in the above-described embodiments, can solve the problem that the thickness fluctuation of the electrode sheet causes misalignment of the tabs corresponding to different cell layers, thus affecting battery performance and lifespan. Compared with related technologies, the beneficial effects of the electrode winding equipment provided in this application are the same as those of the electrode winding method provided in the above embodiments, and other technical features in the electrode winding equipment are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0226] This application provides an electrode winding apparatus, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which are executed by the at least one processor to enable the at least one processor to perform the electrode winding method in any of the above embodiments.

[0227] The following is for reference. Figure 14 , Figure 14 This is a schematic diagram of the electrode winding device provided in this application, illustrating a structure suitable for implementing the embodiments of this application. The electrode winding device in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 14 The electrode winding device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0228] like Figure 14 As shown, the electrode winding device may include a processing unit 1401 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 1402 or a program loaded from storage device 1403 into random access memory (RAM) 1404. The RAM 1404 also stores various programs and data required for the operation of the electrode winding device. The processing unit 1401, ROM 1402, and RAM 1404 are interconnected via a bus 1405. An input / output (I / O) interface 1406 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1406: input devices 1407 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1408 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1403 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1409. Communication device 1409 allows the electrode winding apparatus to communicate wirelessly or wiredly with other devices to exchange data. Although electrode winding apparatuses with various systems are shown in the figures, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems may be implemented alternatively.

[0229] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1403, or installed from ROM 1402. When the computer program is executed by processing device 1401, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0230] The electrode winding apparatus provided in this application, employing the electrode winding method described in the above embodiments, can solve the technical problem that the thickness fluctuation of the electrode sheet causes misalignment of the tabs corresponding to different cell layers, thus affecting battery performance and lifespan. Compared with related technologies, the beneficial effects of the electrode winding apparatus provided in this application are the same as those of the electrode winding method provided in the above embodiments, and other technical features of this electrode winding apparatus are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0231] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0232] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0233] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the electrode winding method in the above embodiments.

[0234] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0235] The aforementioned computer-readable storage medium may be included in the electrode winding device; or it may exist independently and not assembled into the electrode winding device.

[0236] The aforementioned computer-readable storage medium carries one or more programs, which, when executed by the electrode winding apparatus, cause the electrode winding apparatus to perform the following steps:

[0237] Obtain the thickness data of the first electrode and the thickness data of the second electrode; wherein the first electrode corresponds to the electrode area to be wound into a battery cell, and the second electrode corresponds to the electrode area to be wound into a battery cell in the previous time.

[0238] Based on the thickness data of the first electrode and the thickness data of the second electrode, a winding adjustment amount is determined; wherein, the winding adjustment amount is used to adjust the diameter or circumference when the electrode is wound into a battery cell.

[0239] The first electrode is wound based on the winding adjustment amount.

[0240] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0241] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0242] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0243] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described electrode winding method. This solves the problem that electrode thickness fluctuations cause misalignment of the tabs corresponding to different cell layers, thus affecting battery performance and lifespan. Compared with related technologies, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the electrode winding method provided in the above embodiments, and will not be repeated here.

[0244] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the electrode winding method described above.

[0245] The computer program product provided in this application can solve the problem that the position of the tabs corresponding to different cell layers caused by electrode thickness fluctuations is misaligned, thus affecting battery performance and lifespan. Compared with related technologies, the beneficial effects of the computer program product provided in this application are the same as those of the electrode winding method provided in the above embodiments, and will not be repeated here.

[0246] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for winding an electrode sheet, characterized in that, include: During the process of moving the electrode sheet toward the winding section to be wound into a battery cell, the thickness at different positions on the electrode sheet is collected at preset time intervals to obtain the thickness at multiple positions on the electrode sheet. If the distance between two adjacent tab regions on the electrode sheet is detected to be greater than a first value, a first position is determined in the electrode sheet region between the two adjacent tab regions. The first position is used to divide the electrode sheet region that needs to be wound into different cells. Using the first position as a boundary, the thickness at multiple positions on the electrode area close to the winding part is taken as the thickness data of the second electrode, and the thickness at multiple positions on the electrode area far from the winding part is taken as the thickness data of the first electrode; wherein, the first electrode corresponds to the electrode area to be wound into a battery cell, and the second electrode corresponds to the electrode area to be wound into a battery cell in the previous time. Based on the number of tab areas on the first electrode sheet, the number of layers of the first electrode sheet to be wound into a battery cell is determined; Based on the difference between the thickness data of the first electrode and the thickness data of the second electrode, and the number of layers to be wound into a battery cell, the winding adjustment amount is determined. Based on the winding adjustment amount, the first electrode sheet is wound. The winding adjustment amount is specifically used to adjust the diameter or circumference of the electrode sheet when it is wound into a battery cell by adjusting the diameter or circumference of the winding part. Specifically, if the thickness data of the electrode sheet meets at least one of the following conditions, information indicating an abnormality in the thickness of the electrode sheet will be output: The average thickness at multiple locations on the electrode is within a first threshold range, where the first threshold range is a set range of abnormal average thickness. Of the thicknesses at multiple locations on the electrode, at least some locations have thicknesses within a second threshold range, where the second threshold range is a set abnormal range for thickness.

2. The method as described in claim 1, characterized in that, The thickness data of the electrode is determined by calculating the average thickness at multiple locations on the electrode.

3. The method as described in claim 1, characterized in that, The battery cell to be wound is formed by winding a cathode electrode, an anode electrode, and a separator together. The first electrode is either a cathode electrode or an anode electrode, and the second electrode is either a cathode electrode or an anode electrode.

4. The method as described in claim 3, characterized in that, The winding of the first electrode sheet based on the winding adjustment amount includes: Calculate the sum of the winding adjustment amounts corresponding to the cathode and anode electrodes, respectively; Based on the sum of the winding adjustment amounts, the cathode electrode, anode electrode, and diaphragm are wound into a battery cell.

5. The method as described in claim 1, characterized in that, The winding section is used to gradually wind the electrode sheet into a battery cell by rotating it along the axial direction.

6. An electrode winding device, characterized in that, include: The thickness measuring mechanism is used to collect the thickness at different positions on the electrode at preset time intervals during the process of the electrode moving towards the winding part to be wound into a battery cell, so as to obtain the thickness at multiple positions on the electrode. And if the distance between two adjacent tab regions on the electrode is detected to be greater than a first value, a first position is determined in the electrode region between the two adjacent tab regions. The first position is used to divide the electrode region that needs to be wound into different cells. Using the first position as a boundary, the thickness at multiple positions on the electrode area close to the winding part is taken as the thickness data of the second electrode, and the thickness at multiple positions on the electrode area far from the winding part is taken as the thickness data of the first electrode; wherein, the first electrode corresponds to the electrode area to be wound into a battery cell, and the second electrode corresponds to the electrode area to be wound into a battery cell in the previous time. A controller is configured to determine the number of layers to be wound into a battery cell based on the number of tab regions on the first electrode; determine a winding adjustment amount based on the difference between the thickness data of the first electrode and the thickness data of the second electrode, and the number of layers to be wound into a battery cell; adjust the diameter or circumference of the winding section in the electrode winding device based on the winding adjustment amount; and control the adjusted winding section to wind the first electrode; wherein, when the thickness data of the electrode is detected to meet at least one of the following conditions, information indicating that the thickness of the electrode is abnormal is output: the average thickness at multiple locations on the electrode is within a first threshold range, the first threshold range being a set abnormal range for the average thickness; at least some of the thicknesses at multiple locations on the electrode are within a second threshold range, the second threshold range being a set abnormal range for the thickness.

7. An electrode winding device, characterized in that, The apparatus includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the electrode winding method as described in any one of claims 1 to 5.

8. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the electrode winding method as described in any one of claims 1 to 5.

9. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the electrode winding method as described in any one of claims 1 to 5.

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