A cell winding method and winding machine

Abstract

This application discloses a battery cell winding method and a winding machine, relating to the field of battery manufacturing technology. When adjusting the winding needle diameter and embossing roller pressure based on the tab misalignment of the first wound battery cell, this application does not simply combine adjusting the winding needle and embossing roller; instead, it determines the corresponding misalignment components of the winding needle and embossing roller based on the characteristic tab misalignment amount corresponding to each tab cluster. Furthermore, this application determines the adjustment scheme for the winding needle and embossing roller based on the misalignment types of the two tab clusters, achieving an organic combination of adjusting the winding needle and embossing roller. Thus, this application, based on the tab misalignment of the already wound first battery cell, improves the tab misalignment of the second battery cell by comprehensively adjusting the winding needle diameter and embossing roller pressure.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a cell winding method and a winding machine. Background Technology

[0002] Currently, battery cells are generally produced by winding a separator, anode electrode, and negative electrode. After winding, the resulting cell consists of multiple layers of anode and negative electrode, each layer containing tabs. Tabs are the metallic conductors that connect the anode and cathode within the cell, serving as a crucial bridge between the battery's internal and external circuitry. It is essential to ensure that the multiple layers of tabs on the anode and cathode are aligned as closely as possible. However, the winding process carries the risk of tab misalignment, which reduces battery safety. Therefore, minimizing tab misalignment during the winding process is a problem the industry is actively working to solve. Summary of the Invention

[0003] This application provides a battery cell winding method, apparatus, equipment, medium, and product to improve the electrode misalignment of the battery cell, thereby enhancing the battery's safety performance.

[0004] In a first aspect, this application provides a method for winding a battery cell, comprising:

[0005] Obtain the misalignment type of multiple tab clusters of the first cell; the multiple tab clusters include anode tab clusters and cathode tab clusters;

[0006] For each tab cluster, based on the misalignment type, determine the first characteristic tab and the corresponding characteristic tab misalignment amount from each tab of the tab cluster;

[0007] Based on the characteristic electrode misalignment amount corresponding to each electrode cluster, the misalignment component corresponding to the target adjustment component is determined; the target adjustment component includes a winding needle and an embossing roller;

[0008] Based on the misalignment type of the multiple tab clusters and the misalignment component corresponding to the target adjustment component, adjust the parameters of the target adjustment component.

[0009] The second cell is obtained by winding the anode electrode, diaphragm, and cathode electrode according to the target adjustment component after parameter adjustment.

[0010] As can be seen, this application determines the misalignment components of the winding needle and embossing roller based on the characteristic tab misalignment of the anode and cathode tab clusters of the first battery cell that has been wound. Then, based on the misalignment type of the anode and cathode tab clusters and the misalignment components of the winding needle and embossing roller, the winding diameter of the winding needle and the roller pressure of the embossing roller are adjusted. Finally, the anode sheet, diaphragm and cathode sheet are wound based on the adjusted winding needle and embossing roller to obtain the second battery cell.

[0011] Therefore, when adjusting the winding needle diameter and embossing roller pressure based on the tab misalignment of the first wound cell, this application does not simply combine adjusting the winding needle and adjusting the embossing roller. Instead, it determines the corresponding misalignment components of the winding needle and embossing roller based on the characteristic tab misalignment amount corresponding to each tab cluster. Furthermore, this application determines the adjustment scheme for the winding needle and embossing roller based on the misalignment types of the two tab clusters, achieving an organic combination of adjusting the winding needle and adjusting the embossing roller. Thus, it is evident that this application, by comprehensively adjusting the winding needle diameter and embossing roller pressure based on the tab misalignment of the first wound cell, is beneficial for improving the tab misalignment of the second cell.

[0012] In some embodiments, determining a first characteristic pole and a corresponding characteristic pole misalignment amount from each pole of the pole cluster according to the misalignment type for each pole cluster includes:

[0013] From the individual electrodes of this electrode cluster, the electrode located in the feature layer is identified as the first feature electrode;

[0014] The misalignment amount of the first characteristic electrode is determined based on the electrode misalignment amount.

[0015] Thus, this application determines the feature tab misalignment amount based on the tab misalignment amount of the first feature tab. The first feature tab is the tab located in the feature layer of the tab cluster. The tab misalignment amount of the tab in the feature layer can represent the maximum misalignment amount of the entire tab cluster. Adjusting the target adjustment component based on the feature tab misalignment amount that represents the maximum misalignment amount is beneficial to greatly improve the tab misalignment problem.

[0016] In some embodiments, the misalignment type is a first misalignment type, and the feature layer is the outermost layer of the auricle cluster;

[0017] Based on the electrode misalignment of the first characteristic electrode, the characteristic electrode misalignment is determined, including:

[0018] The amount of pole ear misalignment located on the outermost layer of the pole ear cluster is defined as the characteristic pole ear misalignment.

[0019] Therefore, since the innermost tab usually has the smallest tab misalignment, in the case of the first misalignment type (single-sided misalignment), the outermost tab can be considered to have the largest tab misalignment. Using this as the characteristic tab misalignment value better reflects the maximum misalignment of the tab cluster. Based on this, the parameters of the winding needle and embossing roller can be adjusted more accurately using the outermost tab misalignment value, thereby reducing the degree of tab misalignment in the second cell and improving the cell's safety performance.

[0020] In some embodiments, the misalignment type is a second misalignment type, and the feature layer is the middle layer of the auricle cluster;

[0021] Based on the electrode misalignment of the first characteristic electrode, the characteristic electrode misalignment is determined, including:

[0022] The amount of electrode misalignment of the electrode located in the middle layer of the electrode cluster is determined as the characteristic electrode misalignment.

[0023] Thus, when the misalignment type is the second type, i.e., the U-shaped misalignment type, the misalignment of the middle layer tab is the largest. Using this as the characteristic tab misalignment can better reflect the maximum misalignment of the tab cluster. Based on this, the parameters of the winding needle and embossing roller can be adjusted more accurately using this characteristic tab misalignment, which helps to reduce the degree of misalignment of the second cell and thus improve the safety performance of the cell.

[0024] In some embodiments, the misalignment type is a third misalignment type, and the feature layer is a pole layer located at 1 / 4 of the pole cluster and a pole layer located at 3 / 4 of the pole cluster;

[0025] Based on the electrode misalignment of the first characteristic electrode, the characteristic electrode misalignment is determined, including:

[0026] Determine the larger values ​​of the polar ear misalignment at 1 / 4 and 3 / 4 of the polar ear cluster;

[0027] The larger value of the electrode misalignment is determined as the characteristic electrode misalignment.

[0028] Therefore, when the misalignment type is the third type, i.e., the S-shaped misalignment type, the tab with the largest misalignment may be the tab at 1 / 4 or 3 / 4 of the tab cluster. In this case, identifying the larger misalignment values ​​of the tabs at 1 / 4 and 3 / 4 of the tab cluster and using these as characteristic tab misalignment values ​​can better reflect the maximum misalignment of the tab cluster. Based on this, the parameters of the winding needle and embossing roller can be adjusted more accurately using this characteristic tab misalignment value, thereby reducing the misalignment degree of the second cell and improving the cell's safety performance.

[0029] In some embodiments, determining the misalignment component corresponding to the target adjustment component based on the characteristic electrode misalignment amount corresponding to each electrode cluster includes:

[0030] The average value of the characteristic tab misalignment of the anode tab cluster and the characteristic tab misalignment of the cathode tab cluster is calculated to obtain the characteristic tab misalignment of the first cell.

[0031] Based on the misalignment of the characteristic tabs of the first battery cell, the misalignment component corresponding to the target adjustment component is determined.

[0032] Therefore, this application adopts the method of calculating the average value, that is, calculating the average value of the characteristic tab misalignment of the anode tab cluster and the characteristic tab misalignment of the cathode tab cluster. Based on the calculated average value, the characteristic tab misalignment of the first battery cell can be obtained more accurately. Based on the characteristic tab misalignment of the first battery cell, the misalignment component corresponding to the target adjustment component can be accurately determined, that is, the parameters of the winding needle and embossing roller can be accurately adjusted, thereby reducing the degree of misalignment of the second battery cell and improving the safety performance of the battery cell.

[0033] In some embodiments, determining the misalignment component corresponding to the target adjustment component based on the misalignment amount of the cell feature tabs of the first cell includes:

[0034] Based on the misalignment of the characteristic tab of the battery cell and the preset weight of the target adjustment component, the initial misalignment component of the target adjustment component is determined.

[0035] Based on the initial misalignment component, determine the misalignment component of the target adjustment component.

[0036] Therefore, this embodiment of the application takes into account the different principles of adjusting the winding needle and adjusting the embossing roller, and their different degrees of influence on improving tab misalignment. By pre-configuring preset weights for the winding needle and embossing roller, and then determining the initial misalignment components of the winding needle and embossing roller based on the tab misalignment amount of the battery cell and the preset weights, the individual misalignment components of the winding needle and embossing roller are further determined. In this way, this application organically combines the adjustment of the winding needle and embossing roller, avoiding the problem of single-method adjustment in the prior art, and is conducive to improving the tab misalignment problem more efficiently. At the same time, this calculation method is relatively simple and can quickly and accurately determine the individual misalignment components of the winding needle and embossing roller.

[0037] In some embodiments, before determining the misalignment component of the target adjustment component based on the initial misalignment component, the method further includes:

[0038] For the electrode misalignment of each electrode cluster, determine the misalignment quantum adjustment amount of the target adjustment component;

[0039] The misalignment component adjustment amount of the target adjustment component is determined based on the misalignment component quantum adjustment amount corresponding to the anode tab cluster and the misalignment component quantum adjustment amount corresponding to the cathode tab cluster.

[0040] Based on the initial misalignment component, the misalignment component of the target adjustment component is determined, including:

[0041] Based on the initial misalignment component and the adjustment amount of the misalignment component, the misalignment component of the target adjustment component is determined.

[0042] Therefore, in this application, in addition to setting a preset weight for each of the winding needle and the embossing roller, and determining the initial misalignment components of the winding needle and the embossing roller based on the misalignment amount of the cell's characteristic tabs and the two preset weights, an adjustment amount for the misalignment components of each of the winding needle and the embossing roller is further determined. This adjustment amount is used to adapt the initial misalignment components, thereby accurately determining the misalignment components of each of the winding needle and the embossing roller. Since various misalignment situations exist in reality, even for the same misalignment type, the specific misalignment amount of each tab is different. Therefore, after determining the initial misalignment components based on the preset weights, this application also calculates an adjustment amount for the misalignment components to further adjust them, thereby obtaining sufficiently accurate misalignment components. Therefore, the embodiments of this application can more effectively solve the misalignment problem of tabs in different layers of the cell, further improving the safety performance of the battery.

[0043] In some embodiments, determining the misalignment quantum adjustment amount of the target adjustment component for the electrode misalignment amount of each electrode cluster includes:

[0044] For the electrode misalignment of each electrode cluster, determine the first misalignment quantum adjustment amount of the winding needle and the second misalignment quantum adjustment amount of the embossing roller.

[0045] Based on the misalignment quantum adjustment amounts corresponding to the anode tab cluster and the cathode tab cluster, the misalignment component adjustment amount of the target adjustment component is determined, including:

[0046] The misalignment adjustment amount of the needle coil is determined based on the first misalignment quantum adjustment amount corresponding to the anode tab cluster and the cathode tab cluster, respectively.

[0047] The misalignment adjustment amount of the embossing roller is determined based on the second misalignment quantum adjustment amount corresponding to the anode tab cluster and the cathode tab cluster, respectively.

[0048] Therefore, this application provides a specific scheme for determining the misalignment component adjustment amount. For both the anode and cathode tab clusters, the corresponding misalignment component quantum adjustment amount is calculated separately. Then, based on the respective misalignment component quantum adjustment amounts for the anode and cathode tab clusters, the corresponding misalignment component adjustment amount is determined. This method comprehensively considers both the anode and cathode tab clusters, improving the accuracy of the calculated misalignment component adjustment amount for both the winding needle and the embossing roller. Based on this, adjusting the initial misalignment component with the misalignment component adjustment amount obtained through this scheme yields a more accurate misalignment component, thus more effectively solving the misalignment problem of tabs in different layers of the battery cell and further improving the battery's safety performance.

[0049] In some embodiments, for the electrode misalignment of each electrode cluster, determining a first misalignment quantum adjustment amount for the winding needle includes:

[0050] For each electrode cluster, determine the difference in electrode misalignment between the outermost electrode and the innermost electrode.

[0051] For each tab cluster, the first misalignment quantum adjustment amount of the winding needle is determined based on the misalignment difference, the number of tab layers in the tab cluster, and the preset weight of the winding needle.

[0052] Thus, in this embodiment, the difference in misalignment between the outermost and innermost tabs is calculated. Combined with the number of tab layers and the preset weight of the winding needle, the first misalignment quantum adjustment amount of the winding needle can be accurately determined. Because the degree of error correction for the misalignment of tabs in different layers is directly proportional to the number of layers increasing from the inside out when adjusting the winding needle diameter, it is only necessary to determine the misalignment of the outermost and innermost tabs, and then combine this with the number of layers to obtain a sufficiently accurate first misalignment quantum adjustment amount.

[0053] In some embodiments, determining a second misalignment quantum adjustment amount for the embossing roller for the misalignment amount of the tabs of each tab cluster includes:

[0054] For each electrode cluster, fit the distribution curve of the electrode misalignment of each electrode; the distribution curve satisfies the preset condition: the sum of the squared distances between the electrode misalignment of each electrode and the distribution curve is minimized;

[0055] For each anode cluster, determine the sum of the anode misalignment of each anode and the distance to the distribution curve;

[0056] The adjustment amount of the second misalignment component of the embossing roller is determined based on the sum of the distances, the number of electrode layers in the electrode cluster, and the preset weight of the embossing roller.

[0057] Thus, in this embodiment, the distribution curve of the misalignment of each tab is first fitted for each tab cluster, and then the sum of the distances between the misalignment of each tab and the distribution curve is determined. Then, by combining this sum of distances, the number of tab layers, and a preset weight, the second misalignment quantum adjustment amount of the embossing roller can be accurately determined. This is because when adjusting the roller pressure of the embossing roller, the roller pressure increases, and the thickness of the battery cell electrode sheet changes, thus changing the relative position of the tabs. Furthermore, since the battery cell is formed by winding the electrode sheets from the inside out, the positional change of the inner layer tabs is superimposed on the positional change of the outer layer tabs. Therefore, the degree of error correction for the misalignment of tabs in different layers is not positively correlated with the increase in the number of layers from the inside out, but rather a quadratic function. Therefore, this application improves accuracy by determining the second misalignment quantum adjustment amount through curve fitting.

[0058] In some embodiments, the misalignment type of both the cathode tab cluster and the anode tab cluster is the first misalignment type;

[0059] Based on the misalignment type of the multiple electrode clusters and the corresponding misalignment component of the target adjustment component, the parameters of the target adjustment component are adjusted, specifically including:

[0060] When the outer tabs of the cathode tab cluster and the anode tab cluster are misaligned relative to the inner tabs along the winding direction, the winding diameter of the winding needle is increased according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is increased according to the misalignment component of the embossing roller.

[0061] When the outer tabs of the cathode tab cluster and the anode tab cluster are misaligned relative to the inner tabs in a direction opposite to the winding direction, the winding diameter of the winding needle is reduced according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is reduced according to the misalignment component of the embossing roller.

[0062] When the outer tab of the cathode tab cluster is misaligned relative to the inner tab along the winding direction, and the outer tab of the anode tab cluster is misaligned relative to the inner tab in a direction opposite to the winding direction, the winding diameter of the winding needle is reduced according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is increased according to the misalignment component of the embossing roller.

[0063] When the outer tab of the cathode tab cluster is misaligned relative to the inner tab in a direction opposite to the winding direction, and the outer tab of the anode tab cluster is misaligned relative to the inner tab in the winding direction, the winding diameter of the winding needle is increased according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is decreased according to the misalignment component of the embossing roller.

[0064] Thus, in this application embodiment, different adjustment methods are adopted for the winding needle and embossing roller for different types of misalignment, and the winding needle and embossing roller are organically combined so that the tab misalignment can be improved as quickly as possible.

[0065] In some embodiments, the misalignment type of both the cathode tab cluster and the anode tab cluster is the second misalignment type;

[0066] Based on the misalignment type of the multiple electrode clusters and the corresponding misalignment component of the target adjustment component, the parameters of the target adjustment component are adjusted, specifically including:

[0067] When the cathode tab cluster is concave in the middle on the side facing the anode tab cluster and protrudes in the middle on the side facing the cathode tab cluster, the winding diameter of the winding needle is increased according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is decreased according to the misalignment component of the embossing roller.

[0068] When the cathode tab cluster protrudes in the middle on the side facing the anode tab cluster and the anode tab cluster is concave in the middle on the side facing the cathode tab cluster, the roll diameter of the roll needle is reduced according to the misalignment component of the roll needle, and the roll pressure of the embossing roller is increased according to the misalignment component of the embossing roller.

[0069] Thus, in this application embodiment, different adjustment methods are adopted for the winding needle and embossing roller for different types of misalignment, and the winding needle and embossing roller are organically combined so that the tab misalignment can be improved as quickly as possible.

[0070] In some embodiments, obtaining the misalignment type of the multiple tab clusters of the first battery cell includes:

[0071] For each tab cluster, obtain the tab misalignment of each tab in that tab cluster;

[0072] From the multiple pole ears of this pole ear cluster, identify the second characteristic pole ear;

[0073] The type of misalignment of the electrode cluster is determined based on the amount of misalignment of the second characteristic electrode.

[0074] In this way, the misalignment type of the entire tab cluster can be determined by only a small number of second feature tabs, which can reduce the amount of computation and determine the misalignment type of the entire tab cluster with sufficient accuracy, making the judgment of misalignment type more efficient.

[0075] In some embodiments, the second feature tab includes at least the outermost tab and the innermost tab of the tab cluster;

[0076] Based on the amount of pole ear misalignment of the second characteristic pole ear, the misalignment type of the pole ear cluster is determined, including:

[0077] Calculate the first difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the innermost electrode;

[0078] If the first difference is greater than the first threshold, the misalignment type of the pole ear cluster is determined to be the first misalignment type.

[0079] Thus, by focusing on the difference in misalignment between the outermost and innermost tabs, tab clusters of the first misalignment type can be quickly identified. This method only requires obtaining the misalignment amounts of the outermost and innermost tabs, and then calculating the first difference between them. Therefore, this method requires analyzing fewer tabs, reducing computational load, while still achieving a certain level of accuracy and high analytical efficiency.

[0080] In some embodiments, the second feature tab includes at least the outermost tab, the innermost tab, and the middle tab of the tab cluster;

[0081] Based on the amount of misalignment of the second characteristic electrode, the misalignment type of the electrode cluster is determined, including:

[0082] Calculate the second difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the middle electrode, the third difference between the electrode misalignment of the innermost electrode and the electrode misalignment of the middle electrode, and the fourth difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the innermost electrode.

[0083] If both the second and third differences are greater than the second threshold and the fourth difference is less than the third threshold, the misalignment type of the pole ear cluster is determined to be the second misalignment type.

[0084] Thus, by obtaining the electrode misalignment of the outermost electrode, the innermost electrode, and the middle electrode, electrode clusters of the second misalignment type can be effectively captured. Moreover, this method has a relatively small computational load, high analysis efficiency, and reduces the possibility of misjudgment, making the judgment results more reliable.

[0085] In some embodiments, the second feature tab includes at least the outermost tab, the innermost tab, the middle tab, the tab located at 1 / 4 of the tab cluster, and the tab located at 3 / 4 of the tab cluster.

[0086] Based on the amount of pole ear misalignment of the second characteristic pole ear, the misalignment type of the pole ear cluster is determined, including:

[0087] Calculate the fifth difference between the electrode misalignment at the 1 / 4 position and the electrode misalignment at the intermediate layer electrode, the sixth difference between the electrode misalignment at the intermediate layer electrode and the electrode misalignment at the 3 / 4 position, the seventh difference between the electrode misalignment at the innermost electrode and the electrode misalignment at the intermediate layer electrode, and the eighth difference between the electrode misalignment at the intermediate layer electrode and the electrode misalignment at the outermost electrode.

[0088] If the fifth, sixth, seventh, and eighth differences are all greater than the fourth threshold, the misalignment type of the pole ear cluster is determined to be the third misalignment type.

[0089] In this way, the third type of misaligned electrode clusters can be effectively captured. Compared with the above methods, although the amount of computation is slightly increased, only five reference positions of electrodes are obtained from a large number of electrodes for analysis. The analysis efficiency is high, and this method can make accurate judgments for the third type of misaligned electrode clusters, and the judgment results are more reliable.

[0090] In some embodiments, obtaining the electrode misalignment of each electrode in the electrode cluster includes:

[0091] For each electrode included in this electrode cluster, perform the following steps:

[0092] The tape length of the electrode is determined based on the rotation angle of the reference winding needle corresponding to the reference electrode tab of the first cell, the tape length of multiple electrode sheets corresponding to the electrode tab cluster, and the rotation angle of the corresponding winding needle.

[0093] The electrode misalignment is determined based on the travel length of the electrode tab and the reference travel length of the reference electrode tab.

[0094] Because the reference tape length of the reference electrode tab is a relatively standard tape length, the electrode tab misalignment can be obtained by comparing it with this reference tape length. Thus, by comparing the actual tape length of each electrode tab with the reference tape length of the reference electrode tab, the misalignment of each electrode tab can be accurately quantified.

[0095] In some embodiments, before the second cell is obtained by winding the anode electrode, the diaphragm, and the cathode electrode according to the target adjustment assembly with adjusted parameters, the method further includes:

[0096] Obtain the electrode thickness of the anode and / or cathode electrode before it enters the winding needle;

[0097] Based on the electrode thickness before entering the winding needle, adjust the winding diameter of the winding needle and / or the roller pressure of the embossing roller.

[0098] Thus, this embodiment can adjust the winding diameter of the winding needle and / or the roller pressure of the embossing roller according to the thickness of the corresponding electrode sheet used to generate the battery cell. Compared with adjusting the electrode sheet thickness of the previous battery cell, it can reduce the impact of thickness deviation caused by different electrode sheet thicknesses on the electrode tab misalignment. Therefore, by adjusting the winding diameter of the winding needle and / or the roller pressure of the embossing roller based on the electrode sheet thickness obtained in advance before the electrode sheet used to wind the second battery cell enters the winding needle, this embodiment can further improve the electrode tab misalignment.

[0099] In some embodiments, obtaining the electrode thickness of the anode and / or cathode electrode before it enters the winding needle includes:

[0100] Obtain the electrode thickness of the anode and / or cathode electrode after cold pressing;

[0101] The thickness of the cold-pressed electrode is input into the electrode thickness rebound model to predict the electrode thickness of the anode and / or cathode electrode before they enter the winding needle.

[0102] Therefore, using the electrode thickness rebound model to predict electrode thickness can save hardware costs compared to using thickness acquisition equipment on the production line to achieve thickness acquisition.

[0103] Secondly, this application provides a winding machine, including winding needles, a controller, and embossing rollers corresponding to the anode and cathode electrodes respectively;

[0104] The controller is configured as follows:

[0105] Obtain the misalignment type of multiple tab clusters of the first cell; the multiple tab clusters include anode tab clusters and cathode tab clusters;

[0106] For each tab cluster, based on the misalignment type, determine the first characteristic tab and the corresponding characteristic tab misalignment amount from each tab of the tab cluster;

[0107] Based on the characteristic electrode misalignment amount corresponding to each electrode cluster, the misalignment component corresponding to the target adjustment component is determined; the target adjustment component includes the winding needle and the embossing roller;

[0108] Based on the misalignment type of the multiple tab clusters and the misalignment component corresponding to the target adjustment component, adjust the parameters of the target adjustment component.

[0109] The winding needle is electrically connected to the controller and is configured to wind the anode plate, cathode plate, and diaphragm according to the adjusted parameters to obtain a second battery cell.

[0110] The embossing rollers corresponding to the anode and cathode electrodes are electrically connected to the controller. The embossing roller corresponding to the anode electrode is configured to roll the anode electrode before winding according to the adjusted parameters. The embossing roller corresponding to the cathode electrode is configured to roll the cathode electrode before winding according to the adjusted parameters.

[0111] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0112] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0113] Figure 1 This is a schematic diagram showing the relationship between the misalignment correction amount of different layers of tabs and the number of layers under the current adjustment of the winding needle;

[0114] Figure 2 This is a schematic diagram showing the relationship between the misalignment correction amount of different layer tabs and the number of layers under the current adjustment of the embossing roller;

[0115] Figure 3 A schematic flowchart illustrating a first battery cell winding method provided in some embodiments of this application;

[0116] Figure 4 This is a schematic diagram of the electrode distribution of a first misalignment type provided in some embodiments of this application;

[0117] Figure 5 This is a schematic diagram of the electrode distribution of the second misalignment type provided in some embodiments of this application;

[0118] Figure 6 This is a schematic diagram of the electrode distribution of the third misalignment type provided in some embodiments of this application;

[0119] Figure 7 A schematic flowchart illustrating a second cell winding method provided in some embodiments of this application;

[0120] Figure 8 A schematic flowchart illustrating a third battery cell winding method provided in some embodiments of this application;

[0121] Figure 9 A schematic flowchart illustrating a fourth battery cell winding method provided in some embodiments of this application;

[0122] Figure 10 A schematic flowchart illustrating a fifth battery cell winding method provided in some embodiments of this application;

[0123] Figure 11 A schematic flowchart illustrating a sixth battery cell winding method provided in some embodiments of this application;

[0124] Figure 12 A schematic flowchart illustrating a seventh battery cell winding method provided in some embodiments of this application;

[0125] Figure 13 A schematic diagram of the tab distribution for a first type of cell misalignment provided in some embodiments of this application;

[0126] Figure 14 This is a schematic diagram of the electrode distribution for a second type of cell misalignment provided in some embodiments of this application;

[0127] Figure 15 This application provides a schematic diagram of the tab distribution for a third type of cell misalignment in some embodiments.

[0128] Figure 16 A schematic diagram of the tab distribution for a fourth type of cell misalignment provided in some embodiments of this application;

[0129] Figure 17 A schematic diagram of the tab distribution for a fifth type of cell misalignment provided in some embodiments of this application;

[0130] Figure 18 A schematic diagram of the tab distribution for a fifth type of cell misalignment provided in some embodiments of this application;

[0131] Figure 19 This is a schematic diagram of the structure of the coiling needle provided in some embodiments of this application;

[0132] Figure 20 A schematic flowchart illustrating the eighth battery cell winding method provided in some embodiments of this application;

[0133] Figure 21 A flowchart illustrating the ninth battery cell winding method provided in some embodiments of this application;

[0134] Figure 22 A flowchart illustrating a tenth battery cell winding method provided in some embodiments of this application;

[0135] Figure 23 A schematic flowchart illustrating the eleventh battery cell winding method provided in some embodiments of this application;

[0136] Figure 24 A schematic flowchart illustrating the twelfth battery cell winding method provided in some embodiments of this application;

[0137] Figure 25 A schematic flowchart illustrating the twelfth battery cell winding method provided in some embodiments of this application;

[0138] Figure 26 A schematic flowchart illustrating a thirteenth battery cell winding method provided in some embodiments of this application;

[0139] Figure 27 This is a schematic diagram of the structure of a winding machine provided in some embodiments of this application. Detailed Implementation

[0140] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0145] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0146] Currently, battery cells are generally obtained by winding a separator, anode sheet, and negative electrode sheet. The anode sheet and negative electrode sheet are pre-treated by two embossing rollers and pressed to a suitable thickness. Then, the separator, anode sheet, and negative electrode sheet are fed together to a winding needle for winding, thus obtaining the wound battery cell.

[0147] After winding, the resulting battery cell consists of multiple layers of anode and cathode electrodes, each layer containing tabs. Tabs are metallic conductors that connect the anode and cathode within the battery cell, serving as a crucial bridge between the battery's internal and external circuitry. It is essential to ensure that the multiple layers of tabs for the anode and cathode are aligned as closely as possible. However, the winding process carries the risk of tab misalignment, which reduces the battery's safety performance.

[0148] Therefore, reducing the degree of tab misalignment during the winding process is a problem that the industry is striving to solve. Currently, there are two adjustment methods to reduce tab misalignment: adjusting the diameter of the winding needle and adjusting the roller pressure of the embossing roller during the winding process.

[0149] Currently, one of the two methods to reduce the misalignment of the tabs in different layers is to adjust the winding needle or the embossing roller. However, this method has limited effectiveness and cannot effectively solve the problem of misalignment of the tabs in different layers of the cell, thereby reducing the safety performance of the battery.

[0150] The principles of adjusting the winding needle and adjusting the embossing roller are different. The two tab clusters of the battery cell include a variety of different misalignment types. Simply superimposing the two methods may not only fail to enhance the adjustment effect, but may also cause greater misalignment of the tabs in each layer of the battery cell.

[0151] Specifically, adjusting the winding needle changes the length of each electrode layer by altering its diameter, thus changing the position of each electrode tab. It's important to note that changing the winding needle's diameter does not change the length of the electrode between adjacent tabs. Figure 1 This diagram illustrates the relationship between the misalignment correction amount and the number of layers for different layers of tabs under the current condition of adjusting the winding needle. For example... Figure 1 As shown, increasing the diameter of the winding needle will increase the length of each layer of electrode sheet. For different layers of electrode sheet, the influence on the length of each layer of electrode sheet increases from the inside to the outside of the layer number. For the misalignment of each layer of electrode tab, the influence of the winding needle diameter is directly proportional to the number of layers.

[0152] Adjusting the embossing roller changes the thickness of the electrode sheet, thus altering its overall length, and also the length between adjacent tabs. It's important to note that changing the roller pressure does not change the length of each individual electrode layer. Figure 2 This diagram illustrates the relationship between the misalignment correction amount of different layer tabs and the number of layers under the current adjustment of the embossing roller. For example... Figure 2 As shown, increasing the roller pressure of the embossing roller increases the total length of the electrode sheet and also increases the length of the electrode sheet between two adjacent tabs. Furthermore, for electrode sheets of different layers, the degree of influence on the length of each layer varies according to the order of the layers from the inside out. Regarding the misalignment of the tabs in each layer, the influence of the roller pressure of the embossing roller has a quadratic function relationship with the number of layers, with an "inflection point" appearing at one of the layers, i.e., the extreme point of the quadratic function.

[0153] It is evident that adjusting the winding needle and adjusting the embossing roller have different degrees of error correction for the misalignment of the tabs on different layers, and they cannot be simply superimposed. This application considers that there are various types of tab misalignment in battery cells. Based on the characteristics of different misalignment types, and combined with the aforementioned principles of the influence of the winding needle and embossing roller on the amount of tab misalignment, different adjustment strategies can be selected for different misalignment types, thereby aligning the tabs on each layer as much as possible.

[0154] For example, for U-shaped misalignment types where the tab clusters are concave or convex in a certain direction, the two target adjustment components can be organically combined based on the influence of the winding needle and embossing roller on the misalignment of the tabs in different layers, so that the tabs in each layer can be roughly aligned.

[0155] Based on this, this application provides a cell winding method that can effectively solve the misalignment problem of the tabs in different layers of the cell, thereby improving the safety performance of the battery. Figure 3 This is a schematic flowchart illustrating a first method for winding a battery cell, provided in some embodiments of this application. Figure 3 As shown, the method includes the following steps: S301 to S305.

[0156] S301: Obtain the misalignment type of multiple tab clusters of the first cell.

[0157] In this embodiment, the multiple tab clusters of the battery cell include anode tab clusters and cathode tab clusters, respectively. It is necessary to obtain the misalignment type of the anode tab clusters and cathode tab clusters separately. The first battery cell mentioned here is obtained by winding the anode electrode, separator, and cathode electrode with the target adjustment assembly. The first battery cell may have a relatively serious tab misalignment problem. Therefore, based on the misalignment of the first battery cell, it is necessary to adjust the parameters of the target adjustment assembly so that the misalignment degree of the second battery cell obtained by winding the adjusted target adjustment assembly is reduced.

[0158] It should be noted that the misalignment type mentioned in the embodiments of this application refers to the tab cluster, while the cell includes two tab clusters. Therefore, for the entire cell, the cell misalignment type needs to consider the misalignment types of both the anode tab cluster and the cathode tab cluster.

[0159] This application does not limit the specific form or number of misalignment types of the tab clusters, and can be determined according to the actual situation. As an optional implementation, the misalignment types of the tab clusters may include a first misalignment type, a second misalignment type, and a third misalignment type. The following description is in conjunction with the accompanying drawings.

[0160] Figure 4 This is a schematic diagram of the electrode distribution of a first misalignment type provided in some embodiments of this application. For example... Figure 4 As shown, for the multi-layered tabs 401 of the first misalignment type of tab cluster, except for the innermost tab, the other tabs are all misaligned in one direction relative to the innermost tab. Furthermore, in order of the number of layers from the inside out, the degree of offset between these tabs and the innermost tab gradually increases, forming a stepped unilateral misalignment. Therefore, in layman's terms, the first misalignment type can also be called the unilateral misalignment type.

[0161] Figure 5 This is a schematic diagram of the electrode distribution of the second misalignment type provided in some embodiments of this application. For example... Figure 5 As shown, for the multilayer tabs 401 of the second misaligned type of tab cluster, compared to the tabs in the middle layer, the remaining tabs on both sides are misaligned in one direction relative to the tabs in the middle layer, forming a U-shaped misalignment type. Alternatively, the misalignment type of this tab cluster can be understood as follows: the side of this tab cluster facing the other tab cluster has a protruding or concave shape in the middle.

[0162] Figure 6 This is a schematic diagram of the electrode distribution of the third misalignment type provided in some embodiments of this application. For example... Figure 6 As shown, for the multi-layered tabs 401 of the third misaligned type of tab cluster, starting from the innermost tab, as the number of layers increases from the inside out, each tab will initially shift in one direction, with the degree of shift gradually increasing compared to the innermost tab, until it reaches approximately 1 / 4 of the tab cluster. From 1 / 4 of the tab cluster, as the number of layers continues to increase, each tab will begin to shift in another direction, with the degree of shift gradually increasing compared to the tab at 1 / 4, until it reaches approximately 3 / 4 of the tab cluster. Then, starting from the tab at 3 / 4 of the tab cluster, as the number of layers increases from the inside out, each tab will shift in the first direction again, until it reaches the outermost layer, forming an S-shaped misalignment type. Alternatively, the misalignment type of this tab cluster can be understood as follows: the side of this tab cluster facing another tab cluster includes a continuous first part and a second part, where the first part is a centrally protruding type and the second part is a centrally concave type.

[0163] It is important to note that Figures 4 to 6 The diagrams provided are merely for illustrative purposes. In actual applications, the specific number of electrode layers, the magnitude of the electrode tab misalignment in each layer, and the direction of the electrode tab offset from the inside to the outside are not specifically limited and should be determined based on the actual situation.

[0164] S302: For each pole ear cluster, determine the first characteristic pole ear and the corresponding characteristic pole ear misalignment amount from each pole ear of the pole ear cluster according to the misalignment type.

[0165] In this embodiment of the application, the electrode cluster of the battery cell includes an anode electrode cluster and a cathode electrode cluster. For the two electrode clusters, it is necessary to determine the first characteristic electrode and the corresponding characteristic electrode misalignment amount from each electrode of the electrode cluster according to the misalignment type.

[0166] In practical applications, the specific method for selecting the first characteristic electrode from each electrode in the electrode cluster, and the method for determining the misalignment of the characteristic electrode, are not limited. Because the first characteristic electrode and its corresponding misalignment need to characterize the misalignment of the entire electrode cluster, as an optional implementation, the electrode with the largest misalignment can be determined from each electrode in the electrode cluster. Typically, the misalignment of the innermost electrode in the electrode cluster is the smallest, and the first characteristic electrode can be determined by referring to the degree of offset of each electrode relative to the innermost electrode. Thus, the misalignment of the characteristic electrode can be further determined based on the misalignment of the first characteristic electrode.

[0167] For example, for a tab cluster of the first misalignment type, the degree of offset between the outermost tabs and the innermost tab gradually increases from the innermost layer in order of the number of layers. Therefore, among the tabs in the tab cluster, the outermost tab has the largest offset relative to the innermost tab. Since the tab misalignment of the innermost tab is usually the smallest, the outermost tab can be taken as the first characteristic tab, and the corresponding tab misalignment can be taken as the characteristic tab misalignment.

[0168] For the second type of misaligned tab cluster, starting from the tabs in the middle layer, the degree of offset of the tabs gradually increases towards the outer layers compared to the tabs in the middle layer. Since the tab misalignment of the innermost tab in the tab cluster is usually the smallest, the tabs in the middle layer can be regarded as the first characteristic tab, and the corresponding tab misalignment can be regarded as the characteristic tab misalignment.

[0169] For the third type of misalignment of the albino cluster, starting from the innermost albino, as the number of layers increases from the inside out, each albino will initially shift in one direction until it reaches approximately 1 / 4 of the albino cluster, at which point the shift direction changes. Then, at approximately 3 / 4 of the albino cluster, the shift direction changes again until the outermost layer is reached, forming an S-shaped misalignment. Since the albino misalignment of the innermost albino is usually the smallest, the albino at 1 / 4 or 3 / 4 of the albino cluster can be considered the first characteristic albino, and the larger albino misalignment value between the two can be selected as the characteristic albino misalignment value.

[0170] S303: Determine the misalignment component corresponding to the target adjustment component based on the characteristic electrode misalignment amount corresponding to each electrode cluster.

[0171] As mentioned above, the electrode clusters of a battery cell include anode and cathode electrode clusters. The target adjustment component affects the entire battery cell; therefore, it is necessary to comprehensively consider the characteristic electrode misalignment amounts of the anode and cathode electrode clusters to accurately determine the misalignment component corresponding to the target adjustment component. As an optional implementation, the average value of the characteristic electrode misalignment amounts of the anode and cathode electrode clusters can be calculated, and then the misalignment component corresponding to the target adjustment component can be determined based on this average value.

[0172] Furthermore, in this embodiment, the target adjustment component includes a winding needle and an embossing roller, and it is necessary to determine the corresponding misalignment components for the winding needle and the embossing roller respectively. The specific method is not limited here. As an optional implementation, a preset weight can be set, and the respective misalignment components can be determined based on the preset weight and the misalignment amount of the feature tabs.

[0173] S304: Adjust the parameters of the target adjustment component according to the misalignment type of multiple tab clusters and the misalignment component corresponding to the target adjustment component.

[0174] As mentioned above, adjusting the parameters of the target adjustment component will affect the amount of tab misalignment in the entire cell. Therefore, it is necessary to consider the misalignment types of both the anode and cathode tab clusters, and then combine them with the misalignment component of the target adjustment component determined above, to finally adjust the parameters of the target adjustment component.

[0175] As mentioned above, tab clusters can include three misalignment types, and battery cells include anode tab clusters and cathode tab clusters; therefore, cell misalignment types can also include various combinations. In practical applications, the adjustment strategy of the target regulating component can be determined based on different cell misalignment types. Some possible implementation methods are provided below.

[0176] For cases where both the anode tab cluster and the cathode tab cluster belong to the first type of misalignment, the cell misalignment can be further divided into the following situations:

[0177] In the first case, the outer sides of both electrode clusters are misaligned relative to the inner sides along the winding direction.

[0178] In the second case, the outer sides of both tab clusters are misaligned relative to the inner sides in the opposite direction of the winding direction.

[0179] The third case is that the outer side of the anode tab cluster is misaligned relative to the inner side in the opposite direction of the winding direction, while the outer side of the cathode tab cluster is misaligned relative to the inner side in the winding direction (outward-pointing type).

[0180] The fourth case is that the outer side of the anode tab cluster is misaligned relative to the inner side along the winding direction, while the outer side of the cathode tab cluster is misaligned relative to the inner side in the opposite direction along the winding direction (inward-pointing type).

[0181] For four scenarios where both the anode and cathode tab clusters belong to the first misalignment type, different adjustment strategies for the target adjustment components can be adopted. In the first and second scenarios, the misalignment directions of the anode and cathode tab clusters are the same, so the adjustment strategies are relatively simple. For the first scenario, increasing the diameter of the winding needle and increasing the roller pressure of the embossing roller can solve the misalignment problem. For the second scenario, decreasing the diameter of the winding needle and decreasing the roller pressure of the embossing roller can solve the misalignment problem. Furthermore, in these two scenarios, the winding diameter of the winding needle can be primarily adjusted; the adjustment range of the roller pressure of the embossing roller is usually very small, sometimes negligible.

[0182] For the latter two scenarios, since the anode and cathode tab clusters are misaligned in different directions, it's necessary to consider the misalignment of each layer of tabs in both clusters simultaneously, combining the different effects of the winding needle and the embossing roller to align the layers of tabs in both clusters as much as possible. For example, in the third scenario, the misalignment problem can be solved by reducing the winding diameter of the winding needle and increasing the roller pressure of the embossing roller. In the fourth scenario, the misalignment problem can be solved by increasing the winding diameter of the winding needle and decreasing the roller pressure of the embossing roller. In these two cases, adjusting the embossing roller is mainly to change the misalignment type of the tab clusters, making it closer to or change to a single-sided misalignment. Then, adjustments are mainly made based on the winding needle to correct the misalignment problem.

[0183] For cases where both the anode tab cluster and the cathode tab cluster belong to the second misalignment type, the specific cell misalignment situations can be divided into the following:

[0184] In the fifth case, the side of the cathode tab cluster facing the anode tab cluster is concave in the middle, while the side of the anode tab cluster facing the cathode tab cluster is convex in the middle.

[0185] In the sixth case, the side of the cathode tab cluster facing the anode tab cluster is convex in the middle, while the side of the anode tab cluster facing the cathode tab cluster is concave in the middle.

[0186] It is evident that for the two cases where each tab cluster belongs to the second misalignment type, the U-shaped openings of the anode and cathode tab clusters face the same direction. For the fifth case, the misalignment problem can be solved by increasing the diameter of the winding needle and reducing the roller pressure of the embossing roller. For the sixth case, the misalignment problem can be solved by decreasing the diameter of the winding needle and increasing the roller pressure of the embossing roller.

[0187] It's important to note that for the third, fourth, fifth, and sixth scenarios mentioned above, although the adjustment strategies for the target adjustment components overlap—for example, both the third and sixth scenarios address misalignment by reducing the winding diameter of the needle and increasing the roller pressure of the embossing roller—the adjustment components for the needle and embossing roller are different. Therefore, the same strategy can resolve two different types of cell misalignment. Similarly, adjusting the embossing roller in this case primarily aims to change the misalignment type of the tab cluster, moving it closer to or reducing it to a single-sided misalignment. Then, adjustments are mainly made based on the needle to correct the misalignment.

[0188] It is important to note that during the adjustment of the target adjustment components, each adjustment should not be too large to avoid causing other types of misalignment problems with the electrode tabs. Especially for the adjustment of the embossing roller, when increasing the pressure of the embossing roller, the smaller the adjustment range, the better. This is because excessive roller pressure on the electrode sheet can damage the electrode sheet, affecting its performance and even causing it to break. Furthermore, the adjustment strategies corresponding to the various cell misalignment types listed above are all feasible implementation methods of this application, but this application is not limited to the above solutions, and can be determined according to the actual situation in practical applications.

[0189] S305: The target adjustment assembly, after parameter adjustment, is wound around the anode electrode, diaphragm, and cathode electrode to obtain the second cell.

[0190] Finally, after adjusting the parameters of the target adjustment component, the anode electrode, diaphragm, and cathode electrode are wound around the target adjustment component with the adjusted parameters, and the resulting second cell can avoid the misalignment problem of the first cell.

[0191] It is important to note that the purpose of this application is not to perfectly align the tabs of each layer under all misalignment types. Because there are various misalignment types of tab clusters, and the battery cell includes both anode and cathode tab clusters, the types of misalignment within the battery cell are even more numerous. Adjusting either the winding needle or the embossing roller will affect the misalignment amount of each layer of tabs, meaning that in most cases, the misalignment problem of each layer of tabs cannot be perfectly resolved. This application only needs to comprehensively consider the misalignment type of the battery cell, combined with the degree of influence of the winding needle and embossing roller on the misalignment amount of each layer of tabs, to align the tabs of each layer as much as possible. In this way, the overall degree of tab misalignment of the battery cell is reduced, thereby improving the safety performance of the battery.

[0192] As can be seen, this application determines the misalignment components of the winding needle and embossing roller based on the characteristic tab misalignment of the anode and cathode tab clusters of the first battery cell that has been wound. Then, based on the misalignment type of the anode and cathode tab clusters and the misalignment components of the winding needle and embossing roller, the winding diameter of the winding needle and the roller pressure of the embossing roller are adjusted. Finally, the anode sheet, diaphragm and cathode sheet are wound based on the adjusted winding needle and embossing roller to obtain the second battery cell.

[0193] Therefore, when adjusting the winding needle diameter and embossing roller pressure based on the tab misalignment of the first wound cell, this application does not simply combine adjusting the winding needle and adjusting the embossing roller. Instead, it determines the corresponding misalignment components of the winding needle and embossing roller based on the characteristic tab misalignment amount corresponding to each tab cluster. Furthermore, this application determines the adjustment scheme for the winding needle and embossing roller based on the misalignment types of the two tab clusters, achieving an organic combination of adjusting the winding needle and adjusting the embossing roller. Thus, it is evident that this application, by comprehensively adjusting the winding needle diameter and embossing roller pressure based on the tab misalignment of the first wound cell, is beneficial for improving the tab misalignment of the second cell.

[0194] As mentioned above, for anode and cathode tab clusters, it is necessary to determine the first characteristic tab and the corresponding characteristic tab misalignment amount from each tab of the tab cluster according to its misalignment type. However, this application does not limit the method of determining the first characteristic tab, and here is a specific implementation method. Figure 7 This is a schematic flowchart illustrating a second battery cell winding method provided in some embodiments of this application. Figure 7 As shown, in some embodiments, S302 may include S3021 and S3022.

[0195] S3021: From the various poles of the pole cluster, identify the pole located in the feature layer as the first feature pole.

[0196] As mentioned above, the misalignment of the entire tab cluster needs to be characterized based on the first characteristic tab and the corresponding characteristic tab misalignment. However, for tab clusters with different misalignment types, the first characteristic tab that can characterize the entire tab cluster is different. Therefore, in this application, the corresponding feature layer can be determined based on different misalignment types, and then the tab located in the feature layer can be determined as the first characteristic tab.

[0197] As some alternative implementation methods, in the case of the first misalignment type, the outermost layer of the tab cluster can be defined as the feature layer; in the case of the second misalignment type, the middle layer of the tab cluster can be defined as the feature layer; in the case of the third misalignment type, the tab layer located at 1 / 4 of the tab cluster and the tab layer located at 3 / 4 of the tab cluster can be defined as the feature layers.

[0198] S3022: Determine the misalignment amount of the characteristic electrode based on the electrode misalignment amount of the first characteristic electrode.

[0199] In some embodiments, when the misalignment type is the first misalignment type, the outermost layer of the tab cluster can be defined as the feature layer. Correspondingly, determining the feature tab misalignment amount based on the tab misalignment amount of the first feature tab can include: determining the tab misalignment amount of the tab located on the outermost layer of the tab cluster as the feature tab misalignment amount.

[0200] Therefore, this application, for the case of the first misalignment type, determines the outermost layer of the tab cluster as the corresponding feature layer, thereby accurately determining the misalignment amount of the feature tabs in this case. This is because, in the tab cluster of the first misalignment type, except for the innermost tab, the other tabs are all misaligned in one direction relative to the innermost tab, and the degree of offset between these tabs and the innermost tab gradually increases according to the order of the layers from the inside to the outside. Based on this, the first misalignment type is a unilateral misalignment. Furthermore, since the tab misalignment amount of the innermost tab is usually the smallest, under the first misalignment type, the tab misalignment amount of the outermost tab can be considered the largest, which can better reflect the maximum misalignment amount of the tab cluster. Based on this, by using the tab misalignment amount of the outermost tab, the parameters of the winding needle and embossing roller can be adjusted more accurately, thereby reducing the degree of tab misalignment of the second cell and improving the safety performance of the cell.

[0201] In some embodiments, when the misalignment type is the second misalignment type, the middle layer of the tab cluster can be used as the feature layer. Correspondingly, determining the feature tab misalignment amount based on the tab misalignment amount of the first feature tab can include: determining the tab misalignment amount of the tab located in the middle layer of the tab cluster as the feature tab misalignment amount.

[0202] This application addresses the second type of misalignment by identifying a corresponding feature layer, thereby accurately determining the misalignment amount of the feature tabs. Specifically, in the case of the second type of misalignment, the middle layer of the tab cluster is designated as the corresponding feature layer, which better reflects the maximum misalignment amount of the tab cluster. Based on this, the parameters of the winding needle and embossing roller can be adjusted more accurately using this feature tab misalignment amount, which helps reduce the degree of misalignment in the second battery cell and thus improves the safety performance of the battery cell.

[0203] In some embodiments, the misalignment type is the third misalignment type, and the tab layers located at 1 / 4 of the tab cluster and 3 / 4 of the tab cluster can be used as feature layers. Correspondingly, determining the feature tab misalignment amount based on the tab misalignment amount of the first feature tab can include: determining the larger value of the tab misalignment amount of the tabs located at 1 / 4 and 3 / 4 of the tab cluster; and determining the larger value of the tab misalignment amount as the feature tab misalignment amount.

[0204] Therefore, when the misalignment type is the third type, i.e., the S-shaped misalignment type, the tab with the largest misalignment may be the tab at 1 / 4 or 3 / 4 of the tab cluster. In this case, identifying the larger misalignment values ​​of the tabs at 1 / 4 and 3 / 4 of the tab cluster and using these as characteristic tab misalignment values ​​can better reflect the maximum misalignment of the tab cluster. Based on this, the parameters of the winding needle and embossing roller can be adjusted more accurately using this characteristic tab misalignment value, thereby reducing the misalignment degree of the second cell and improving the cell's safety performance.

[0205] Thus, this application determines the characteristic electrode misalignment amount based on the electrode misalignment amount of the first characteristic electrode. The first characteristic electrode is the electrode located in the characteristic layer of the electrode cluster. Therefore, this application can obtain a more accurate characteristic electrode misalignment amount by calculating a smaller electrode misalignment amount, and thus can characterize the electrode misalignment amount of the entire electrode cluster.

[0206] Since the first battery cell includes two types of tab clusters, namely anode tab clusters and cathode tab clusters, when determining the misalignment component corresponding to the target adjustment component, it is necessary to obtain the cell characteristic tab misalignment amount of the first battery cell. Therefore, it is necessary to comprehensively consider the characteristic tab misalignment amounts of the anode tab cluster and the cathode tab cluster, so as to accurately determine the cell characteristic tab misalignment amount of the first battery cell.

[0207] As an optional implementation, the average of the characteristic tab misalignment of the anode tab cluster and the characteristic tab misalignment of the cathode tab cluster can be calculated to obtain the characteristic tab misalignment of the first cell. A detailed explanation follows with reference to the accompanying drawings. Figure 8 This is a schematic flowchart illustrating a third battery cell winding method provided in some embodiments of this application. Figure 8 As shown, in some embodiments, S303 may include S3031 and S3032.

[0208] S3031: Calculate the average of the characteristic tab misalignment of the anode tab cluster and the characteristic tab misalignment of the cathode tab cluster to obtain the characteristic tab misalignment of the first cell.

[0209] Therefore, this application adopts the method of calculating the average value, that is, calculating the average value of the characteristic tab misalignment of the anode tab cluster and the characteristic tab misalignment of the cathode tab cluster. Based on the calculated average value, the characteristic tab misalignment of the first battery cell can be obtained more accurately. Based on the characteristic tab misalignment of the first battery cell, the misalignment component corresponding to the target adjustment component can be accurately determined, that is, the parameters of the winding needle and embossing roller can be accurately adjusted, thereby reducing the degree of misalignment of the second battery cell and improving the safety performance of the battery cell.

[0210] S3032: Determine the misalignment component corresponding to the target adjustment component based on the misalignment amount of the characteristic tab of the first cell.

[0211] Since the target adjustment components of this application include a winding needle and an embossing roller, both target adjustment components require their own corresponding misalignment components. The misalignment components of both are determined based on the misalignment of the cell's characteristic tabs. Therefore, it is necessary to adopt appropriate methods to determine the misalignment components of both separately.

[0212] As an optional embodiment, the initial misalignment component can be determined by setting corresponding preset weights for the needle winding roller and the embossing roller, and then the final misalignment component can be determined based on the preset weights.

[0213] Therefore, this embodiment of the application takes into account the different principles of adjusting the winding needle and adjusting the embossing roller, and their different degrees of influence on improving tab misalignment. By pre-configuring preset weights for the winding needle and embossing roller, and then determining the initial misalignment components of the winding needle and embossing roller based on the tab misalignment amount of the battery cell and the preset weights, the individual misalignment components of the winding needle and embossing roller are further determined. In this way, this application organically combines the adjustment of the winding needle and embossing roller, avoiding the problem of single-method adjustment in the prior art, and is conducive to improving the tab misalignment problem more efficiently. At the same time, this calculation method is relatively simple and can quickly and accurately determine the individual misalignment components of the winding needle and embossing roller.

[0214] The following describes a feasible implementation method for calculating the misalignment component in conjunction with the accompanying drawings. Figure 9 This is a schematic flowchart illustrating a fourth battery cell winding method provided in some embodiments of this application. Figure 9 As shown, in some embodiments, S3032 may include S30321 and S30322.

[0215] S30321: Determine the initial misalignment component of the target adjustment component based on the misalignment amount of the characteristic tab of the battery cell and the preset weight of the target adjustment component.

[0216] The misalignment of the characteristic tabs of the battery cell can be determined based on the misalignment of the characteristic tabs of the anode tab cluster and the characteristic tabs of the cathode tab cluster. For example, it can be determined by calculating the average value.

[0217] The preset weights can be pre-set according to the actual situation, and corresponding preset weights need to be set for the winding needle and the embossing roller respectively. As an optional implementation, the preset weight of the winding needle can be set to 1, and the preset weight of the embossing roller can be set to 0.5. Based on half of the misalignment of the cell feature tab, multiplying it by the corresponding preset weight, the corresponding initial misalignment component can be obtained. For example, assuming that the misalignment of the cell feature tab of the first cell is C, then the misalignment component of the winding needle is: C / 2; the misalignment component of the embossing roller is: C / 2*0.5.

[0218] S30322: Determine the misalignment component of the target adjustment component based on the initial misalignment component.

[0219] This application does not limit the specific method for determining the misalignment component of the target adjustment component based on the initial misalignment component. As an optional implementation, the calculated initial misalignment component can be directly determined as the final misalignment component of the target adjustment component. This method is simple to implement, but the adjustment accuracy may be slightly lower.

[0220] Therefore, in order to improve the accuracy of parameter adjustment, this application proposes another feasible implementation scheme, namely, to pre-determine the misalignment component adjustment amount of a target adjustment component, and then adjust the initial misalignment component based on the misalignment component adjustment amount, thereby determining the accurate misalignment component.

[0221] The following describes, with reference to the accompanying drawings, a feasible implementation method for determining the misalignment component of the target adjustment component based on the initial misalignment component. Figure 10 This is a schematic flowchart illustrating a fifth battery cell winding method provided in some embodiments of this application. Figure 10 As shown, in some embodiments, before S30322, the method may further include: S303221 and S303222, and S30322 may specifically include S303223.

[0222] S303221: For the electrode misalignment of each electrode cluster, determine the misalignment quantum adjustment amount of the target adjustment component.

[0223] Since the target adjustment component includes a needle winding and an embossing roller, in some embodiments, for the amount of misalignment of the tabs of each tab cluster, determining the misalignment quantum adjustment amount of the target adjustment component includes: for the amount of misalignment of the tabs of each tab cluster, determining a first misalignment quantum adjustment amount of the needle winding and determining a second misalignment quantum adjustment amount of the embossing roller.

[0224] S303222: Determine the misalignment component adjustment amount of the target adjustment component based on the misalignment component quantum adjustment amount corresponding to the anode tab cluster and the cathode tab cluster.

[0225] After determining the first misalignment quantum adjustment amount of the needle winding and the second misalignment quantum adjustment amount of the embossing roller, it is necessary to further determine the misalignment quantum adjustment amount of the target adjustment component for both the needle winding and the embossing roller, based on the misalignment quantum adjustment amounts corresponding to the anode tab cluster and the cathode tab cluster. Specifically, this may include:

[0226] The misalignment adjustment amount of the winding needle is determined based on the first misalignment quantum adjustment amount corresponding to the anode and cathode tab clusters, respectively; and the misalignment adjustment amount of the embossing roller is determined based on the second misalignment quantum adjustment amount corresponding to the anode and cathode tab clusters, respectively.

[0227] Therefore, this application provides a specific scheme for determining the misalignment component adjustment amount. For both the anode and cathode tab clusters, the corresponding misalignment component quantum adjustment amount is calculated separately. Then, based on the respective misalignment component quantum adjustment amounts for the anode and cathode tab clusters, the corresponding misalignment component adjustment amount is determined. This method comprehensively considers both the anode and cathode tab clusters, improving the accuracy of the calculated misalignment component adjustment amount for both the winding needle and the embossing roller. Based on this, adjusting the initial misalignment component with the misalignment component adjustment amount obtained through this scheme yields a more accurate misalignment component, thus more effectively solving the misalignment problem of tabs in different layers of the battery cell and further improving the battery's safety performance.

[0228] S303223: Determine the misalignment component of the target adjustment component based on the initial misalignment component and the misalignment component adjustment amount.

[0229] For both the needle winding roller and the embossing roller, it is necessary to determine the corresponding first misalignment quantum adjustment amount and the second misalignment quantum adjustment amount, and then determine the corresponding misalignment component based on their respective initial misalignment components.

[0230] Therefore, in this application, in addition to setting a preset weight for each of the winding needle and the embossing roller, and determining the initial misalignment components of the winding needle and the embossing roller based on the misalignment amount of the cell's characteristic tabs and the two preset weights, an adjustment amount for the misalignment components of each of the winding needle and the embossing roller is further determined. This adjustment amount is used to adapt the initial misalignment components, thereby accurately determining the misalignment components of each of the winding needle and the embossing roller. Since various misalignment situations exist in reality, even for the same misalignment type, the specific misalignment amount of each tab is different. Therefore, after determining the initial misalignment components based on the preset weights, this application also calculates an adjustment amount for the misalignment components to further adjust them, thereby obtaining sufficiently accurate misalignment components. Although this application adds calculation steps, it improves the accuracy of the final misalignment components, thus more effectively solving the misalignment problem of tabs in different layers of the cell and further improving the safety performance of the battery.

[0231] Here is a specific implementation method for the first misalignment quantum adjustment amount corresponding to the volume. Figure 11 This is a schematic flowchart illustrating a sixth battery cell winding method provided in some embodiments of this application. Figure 11 As shown, in some embodiments, determining the first misalignment quantum adjustment amount of the winding needle for the misalignment amount of the respective tabs of each tab cluster may include: S1101 and S1102.

[0232] S1101: For each tab cluster, determine the difference in the amount of tab misalignment between the outermost tab and the innermost tab.

[0233] Because when adjusting the winding diameter of the winding needle, the degree of correction of the misalignment of the tabs of different layers is proportional to the increase of the number of layers from the inside to the outside, the embodiment of this application can obtain the misalignment difference by determining the tab misalignment of the outermost tab and the innermost tab and then calculating the difference between the two.

[0234] S1102: For each tab cluster, determine the first misalignment quantum adjustment amount of the winding needle based on the misalignment difference, the number of tab layers in the tab cluster, and the preset weight of the winding needle.

[0235] After obtaining the misalignment difference, the first misalignment quantum adjustment amount of the winding needle can be accurately determined based on the misalignment difference, the number of tab layers in the tab cluster, and the preset weight of the winding needle. As an optional implementation method, assuming the tab misalignment of the outermost tab is Ln and the tab misalignment of the innermost tab is L1, the misalignment difference is (Ln-L1). With n layers, the intermediate amount (Ln-L1) / n can be obtained. Combining this with the preset weight of the winding needle (assuming it is 1), the first misalignment quantum adjustment amount (Ln-L1) / n can be obtained.

[0236] Therefore, this application specifically provides a method for determining the first misalignment quantum adjustment amount of the winding needle. First, the difference in misalignment between the outermost and innermost tabs is calculated. Then, combined with the number of tab layers and the preset weight of the winding needle, the first misalignment quantum adjustment amount of the winding needle can be accurately determined. Because the degree of error correction for the misalignment of tabs in different layers is directly proportional to the number of layers increasing from the inside out when adjusting the winding needle diameter, it is only necessary to determine the tab misalignment of the outermost and innermost tabs, and then combine this with the number of layers to obtain a sufficiently accurate first misalignment quantum adjustment amount. It is evident that this application provides a relatively simple calculation method that yields sufficiently accurate results.

[0237] Regarding the second misalignment quantum adjustment amount of the embossing roller, a specific implementation method is provided here. Figure 12 This is a flowchart illustrating a seventh battery cell winding method provided in some embodiments of this application. Figure 12 As shown, in some embodiments, determining the second misalignment quantum adjustment amount of the embossing roller for the misalignment amount of the electrode of each electrode cluster may include: S1201 to S1203.

[0238] S1201: For each anode cluster, fit the distribution curve of the anode misalignment of each anode.

[0239] The distribution curve meets the preset condition: the sum of the electrode misalignment of each electrode and the square of the distance from the distribution curve is minimized.

[0240] S1202: For each anode cluster, determine the sum of the anode misalignment and the distance from the distribution curve for each anode.

[0241] This application employs the least squares method, where the sum of the distances between the electrode misalignment of each electrode and the distribution curve is the residual sum. In regression analysis, if an overdetermined system exists (i.e., the number of equations exceeds the number of unknowns), the system generally has no solution and can only be approximated. The least squares method is one way to find approximate solutions to such overdetermined systems of equations. Specifically, it defines the residuals between observed values ​​(true values ​​or observed response variables) and predicted values ​​(response variables calculated by the model) (the residuals are the differences between the observed values ​​and the fitted values ​​provided by the model), and seeks parameter values ​​that minimize the sum of squared residuals.

[0242] S1203: Determine the second misalignment component adjustment amount of the embossing roller based on the sum of distances, the number of electrode layers in the electrode cluster, and the preset weight of the embossing roller.

[0243] Assuming the sum of the distances determined above is S, the number of tab layers is n, and the preset weight of the embossing roller is 0.5, then the adjustment amount of the second misalignment component is Q = S / n * 0.5.

[0244] In addition, to further reduce the adjustment amount of the embossing roller, the adjustment amount of the second misalignment component mentioned above can be multiplied by a preset weight (e.g., 0.5) and divided by a real number greater than 1. That is, the final adjustment amount of the embossing roller can be Q*0.5 / A, where A is a real number greater than 1.

[0245] Therefore, this application specifically provides a method for determining the second misalignment quantum adjustment amount of the embossing roller. First, a distribution curve of the misalignment amount of each tab is fitted for each tab cluster. Then, the sum of the distances between the misalignment amount of each tab and the distribution curve is determined. Finally, by combining this sum of distances, the number of tab layers, and preset weights, the second misalignment quantum adjustment amount of the embossing roller can be accurately determined. This is because when adjusting the roller pressure of the embossing roller, the roller pressure increases, and the thickness of the battery cell electrode changes, thus changing the relative position of the tabs. Furthermore, since the battery cell is formed by winding the electrode sheets from the inside out, the positional change of the inner layer tabs is superimposed on the positional change of the outer layer tabs. Therefore, the degree of error correction for the misalignment amount of the tabs in different layers is not positively correlated with the increase in the number of layers from the inside out, but rather a quadratic function. Therefore, this application ensures accuracy by determining the second misalignment quantum adjustment amount through curve fitting.

[0246] Since adjusting the winding needle and embossing roller has completely different effects on the misalignment of different layers of tabs, this application provides a specific adjustment scheme for the case where both the cathode and anode tab clusters have the first misalignment type. Specifically, in this case, the parameters of the target adjustment component are adjusted according to the misalignment types of multiple tab clusters and the misalignment components corresponding to the target adjustment component. Some feasible implementation methods are described below with reference to the accompanying drawings.

[0247] Figure 13 This is a schematic diagram of the tab distribution for a first type of cell misalignment provided in some embodiments of this application. For example... Figure 13 As shown in the figure, the cathode tab cluster and anode tab cluster have multiple layers of tabs 401. Assume the left side is the cathode tab cluster and the right side is the anode tab cluster. The winding direction is clockwise. It can be seen that the outer tabs of both the cathode and anode tab clusters are misaligned relative to the inner tabs along the winding direction. At this point, both tab clusters of the cell are misaligned on one side, and the offset directions are the same.

[0248] The specific adjustment strategy is as follows: when the outer tabs of both the cathode and anode tab clusters are misaligned relative to the inner tabs along the winding direction, increase the winding diameter of the winding needle according to the misalignment component, and increase the roller pressure of the embossing roller according to the misalignment component. Furthermore, in both cases, the winding diameter of the winding needle can be primarily adjusted, while the adjustment range of the roller pressure of the embossing roller is usually very small, sometimes negligible.

[0249] Figure 14 This is a schematic diagram of the tab distribution for a second type of cell misalignment provided in some embodiments of this application. For example... Figure 14 As shown in the figure, the multi-layered tabs 401 of the cathode tab cluster and anode tab cluster are illustrated, with the cathode tab cluster on the left and the anode tab cluster on the right. The winding direction is clockwise; it can be seen that the outer tabs of both the cathode and anode tab clusters are misaligned relative to the inner tabs in the opposite direction of the winding direction. At this time, both tab clusters of the cell are misaligned on one side, and the offset directions are the same.

[0250] The specific adjustment strategy is as follows: when the outer tabs of both the cathode and anode tab clusters are misaligned relative to the inner tabs in a direction opposite to the winding direction, the winding diameter of the winding needle is reduced based on the misalignment component, and the roller pressure of the embossing roller is reduced based on the misalignment component. Furthermore, in both cases, the winding diameter of the winding needle can be primarily adjusted, while the adjustment range of the roller pressure of the embossing roller is usually very small, sometimes negligible.

[0251] Figure 15 This is a schematic diagram of the tab distribution for a third type of cell misalignment provided in some embodiments of this application. For example... Figure 15 As shown in the figure, the cathode tab cluster and anode tab cluster have multiple layers of tabs 401. The left side represents the cathode tab cluster, and the right side represents the anode tab cluster. The winding direction is clockwise. It can be seen that the outer tabs of the cathode tab cluster are misaligned relative to the inner tabs along the winding direction, while the outer tabs of the anode tab cluster are misaligned relative to the inner tabs in the opposite direction to the winding direction. At this point, the two tab clusters of the battery cell form an outward-facing, octagonal misalignment.

[0252] The specific adjustment strategy is as follows: When the outer tabs of the cathode tab cluster are misaligned relative to the inner tabs along the winding direction, and the outer tabs of the anode tab cluster are misaligned relative to the inner tabs in the opposite direction to the winding direction, the winding diameter of the winding needle is reduced based on the misalignment component, and the roller pressure of the embossing roller is increased based on the misalignment component. It should be noted that in this case, adjusting the embossing roller is mainly to change the misalignment type of the tab clusters, making it closer to or even completely misaligned on one side. Then, adjustments are primarily made based on the winding needle to correct this misalignment problem.

[0253] Figure 16 This is a schematic diagram of the tab distribution for a fourth type of cell misalignment provided in some embodiments of this application. For example... Figure 16 As shown in the figure, the cathode tab cluster and anode tab cluster have multiple layers of tabs 401. The left side represents the cathode tab cluster, and the right side represents the anode tab cluster. The winding direction is clockwise. It can be seen that the outer tab of the cathode tab cluster is misaligned relative to the inner tab in the opposite direction to the winding direction, and the outer tab of the anode tab cluster is misaligned relative to the inner tab in the winding direction. At this point, the two tab clusters of the battery cell form an inward-pointing misalignment.

[0254] The specific adjustment strategy is as follows: When the outer tabs of the cathode tab cluster are misaligned relative to the inner tabs in a direction opposite to the winding direction, and the outer tabs of the anode tab cluster are misaligned relative to the inner tabs in the winding direction, the winding diameter of the winding needle is increased based on the misalignment component, and the roller pressure of the embossing roller is decreased based on the misalignment component. It should be noted that in this case, adjusting the embossing roller is mainly to change the misalignment type of the tab clusters, making it closer to or even completely misaligned on one side. Then, adjustments are primarily made based on the winding needle to correct this misalignment problem.

[0255] It is important to note that Figures 13 to 16 The diagrams provided are merely for illustrative purposes. In actual applications, the specific number of electrode layers, the magnitude of the electrode tab misalignment in each layer, and the direction of the electrode tab offset from the inside to the outside are not specifically limited and should be determined based on the actual situation.

[0256] In this application, four different adjustment strategies are provided for cases where both the cathode and anode tab clusters exhibit the first type of misalignment. Increasing the winding diameter of the winding needle increases the length of each electrode layer, causing the outer tabs to shift in the opposite direction of the winding. Increasing the roller pressure of the embossing roller reduces the electrode thickness and increases the length between adjacent tabs. However, the impact of adjusting the winding needle and embossing roller on the misalignment of different layers of tabs is entirely different. The embossing roller, in particular, exhibits a quadratic function effect on the misalignment of different layers of tabs, meaning that the impact reaches an inflection point as the number of layers increases from the inside out. Based on this principle, different adjustment strategies can be adopted for different cell misalignment types.

[0257] Thus, by combining both the needle winding and embossing roller methods, although it may not be possible to perfectly align all the tabs in certain special cases, the tab misalignment problem can be resolved as much as possible. For example, when the outer sides of two tab clusters are misaligned relative to the inner sides along the winding direction, this type of misalignment problem can be solved by directly increasing the diameter of the needle winding and increasing the roller pressure of the embossing roller. When the outer sides of two tab clusters are misaligned relative to the inner sides in the opposite direction of the winding direction, this type of misalignment problem can be solved by directly decreasing the diameter of the needle winding and decreasing the roller pressure of the embossing roller. However, when the anode and cathode tab clusters are misaligned in different directions, such as outward and inward octagonal misalignments, it is necessary to correct the tab misalignment problem as much as possible by either increasing the diameter of the needle winding and decreasing the roller pressure of the embossing roller, or decreasing the diameter of the needle winding and increasing the roller pressure of the embossing roller.

[0258] Furthermore, for cases where both the cathode and anode tab clusters exhibit the second misalignment type, two specific adjustment strategies are provided. Specifically, in this case, the parameters of the target adjustment component are adjusted based on the misalignment types of multiple tab clusters and the misalignment components corresponding to the target adjustment component. Some feasible implementation methods are described below with reference to the accompanying drawings.

[0259] Figure 17 This is a schematic diagram of the tab distribution for a fifth type of cell misalignment provided in some embodiments of this application. For example... Figure 17 As shown in the figure, the multilayer tabs 401 of the cathode tab cluster and the anode tab cluster are illustrated. Assume the left side is the cathode tab cluster and the right side is the anode tab cluster. The winding direction is clockwise. It can be seen that the side of the cathode tab cluster facing the anode tab cluster is concave in the middle, while the side of the anode tab cluster facing the cathode tab cluster is convex in the middle. At this point, both tab clusters of the cell are U-shaped misaligned, and the U-shaped openings both face the sun.

[0260] The specific adjustment strategy is as follows: when the cathode tab cluster is concave in the middle on the side facing the anode tab cluster, and the anode tab cluster is convex in the middle on the side facing the cathode tab cluster, the winding diameter of the winding needle is increased according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is decreased according to the misalignment component of the embossing roller. It should be noted that in this case, adjusting the embossing roller is mainly to change the misalignment type of the tab clusters, making it closer to or change to a single-sided misalignment. Then, adjustments are mainly made based on the winding needle to correct this misalignment problem.

[0261] Figure 18 This is a schematic diagram of the tab distribution for a fifth type of cell misalignment provided in some embodiments of this application. For example... Figure 18 As shown in the figure, the multilayer tabs 401 of the cathode tab cluster and the anode tab cluster are illustrated. Assume the left side is the cathode tab cluster and the right side is the anode tab cluster. The winding direction is clockwise. It can be seen that the cathode tab cluster has a centrally protruding shape on the side facing the anode tab cluster, while the anode tab cluster has a centrally concave shape on the side facing the cathode tab cluster. At this point, both tab clusters of the cell are U-shaped misaligned, and the U-shaped openings both face the cathode.

[0262] The specific adjustment strategy is as follows: when the cathode tab cluster protrudes in the center on the side facing the anode tab cluster, and the anode tab cluster is concave in the center on the side facing the cathode tab cluster, the winding diameter of the winding needle is reduced according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is increased according to the misalignment component of the embossing roller. The adjustment principles for the winding needle and the embossing roller are the same as in the above embodiment, and will not be repeated here.

[0263] It is important to note that Figure 17 and Figure 18The diagrams provided are merely for illustrative purposes. In actual applications, the specific number of electrode layers, the magnitude of the electrode tab misalignment in each layer, and the direction of the electrode tab offset from the inside to the outside are not specifically limited and should be determined based on the actual situation.

[0264] Furthermore, the adjustment of the winding needle and embossing roller in the above embodiments is not specifically limited here and can be determined according to the actual situation. Specifically, the adjustment of the winding needle can be achieved based on the winding needle diameter adjustment component. For example, a common implementation method is to set a wedge in the axial direction of the winding needle, and the winding needle diameter can be adjusted by changing the depth of the wedge embedded in the winding needle. Figure 19 The diagram shows the structure of the coiling needle provided in some embodiments of this application. Figure 19 As shown, the winding needle 1901 may include a plurality of sub-winding needles, which are arranged circumferentially along the winding needle 1901. The plurality of sub-winding needles shown in the figure include a first sub-winding needle 19011 and a second sub-winding needle 19012 arranged opposite to each other, with a channel provided between the first sub-winding needle 19011 and the second sub-winding needle 19012.

[0265] The winding diameter adjustment assembly 1902 includes a drive member 19021 and an adjustment member 19022. The drive member 19021 is used to drive the adjustment member 19022 to move axially along the winding needle 1901. The adjustment member 19022 is configured to drive at least a portion of a plurality of sub-winding needles to move radially along the winding needle 1901 by moving axially.

[0266] Adjustment member 19022 is configured to move axially within the channel. Adjustment member 19022 includes an inclined surface toward the first sub-coiling needle 19011, the inclined surface being tilted at a first angle relative to the axial direction. Based on this, the amount of displacement of drive member 19021 in the axial direction of needle 1901 can be determined according to the required adjustment of radius change and the first angle.

[0267] As for the roller pressure of the embossing roller, it can be achieved in corresponding ways for different types of embossing rollers. For example, the embossing roller can be driven by hydraulic or pneumatic pressure, and the pressure applied to the electrode by the embossing roller can be adjusted by regulating the hydraulic or pneumatic pressure.

[0268] In this application, two different adjustment strategies are provided for cases where both the cathode and anode tab clusters exhibit the second type of misalignment. Since adjusting the winding needle and embossing roller has completely different effects on the misalignment of tabs in different layers, especially the embossing roller, whose influence on the misalignment of tabs in different layers follows a quadratic function, meaning that the influence reaches an inflection point as the number of layers increases from the inside out. Therefore, for the second type of misalignment, where the tab cluster is concave or convex in one direction, the misalignment problem needs to be corrected as much as possible by either increasing the winding needle diameter and decreasing the embossing roller pressure, or decreasing the winding needle diameter and increasing the embossing roller pressure.

[0269] Thus, the two strategies provided in this application can effectively solve the misalignment problem when both the cathode tab cluster and the anode tab cluster have the second misalignment type.

[0270] In practical applications, there is no specific limitation on how to obtain the misalignment type of the multiple tab clusters of the first cell. Examples of possible misalignment types have been given above. Taking the first, second, and third misalignment types mentioned above as examples, each misalignment type has its own characteristics, and the misalignment type can be determined based on the amount of tab misalignment of each tab in the tab cluster.

[0271] As a feasible approach, a second characteristic pole can be identified from multiple poles in a pole cluster. The misalignment type of the pole cluster can then be determined by the amount of misalignment of this second characteristic pole. In this way, the misalignment type of the entire pole cluster can be determined using only a small number of second characteristic poles, reducing computational complexity and providing sufficient accuracy to determine the misalignment type, thus making the misalignment type determination more efficient.

[0272] The following describes a feasible implementation method for determining the misalignment type of the tab cluster by means of the tab misalignment amount of the second characteristic tab, with reference to the accompanying drawings. Figure 20 This is a flowchart illustrating an eighth battery cell winding method provided in some embodiments of this application. Figure 20 As shown, in some embodiments, S301 may include S3011 to S3013.

[0273] S3011: For each tab cluster, obtain the tab misalignment of each tab in the tab cluster.

[0274] First, obtain the polarity misalignment of each polarity in the polarity cluster to facilitate subsequent calculations.

[0275] S3012: Identify the second characteristic pole ear from among the multiple pole ears of the pole ear cluster.

[0276] As some optional implementations, several specific selection schemes for the second characteristic tab are listed below. 1. The second characteristic tab may include the outermost tab and the innermost tab of the tab cluster; 2. The second characteristic tab includes at least the outermost tab, the innermost tab, and the middle tab of the tab cluster; 3. The second characteristic tab includes at least the outermost tab, the innermost tab, the middle tab, the tab located at 1 / 4 of the tab cluster, and the tab located at 3 / 4 of the tab cluster.

[0277] S3013: Determine the misalignment type of the electrode cluster based on the electrode misalignment amount of the second characteristic electrode.

[0278] Finally, based on the aforementioned electrode misalignment amounts of each second characteristic electrode, combined with preset judgment conditions, the misalignment type of the electrode cluster can be determined. These will be explained in detail below.

[0279] In the case where the second characteristic tab includes at least the outermost and innermost tabs of the tab cluster, a specific implementation is provided here. Figure 21 This is a flowchart illustrating a ninth battery cell winding method provided in some embodiments of this application. Figure 21 As shown, S3013 may include S30131 and S30132.

[0280] S30131: Calculate the first difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the innermost electrode.

[0281] First, obtain the electrode misalignment of the outermost electrode and the electrode misalignment of the innermost electrode respectively. Then, subtract the two electrode misalignment values ​​to obtain the first difference.

[0282] S30132: If the first difference is greater than the first threshold, determine the misalignment type of the electrode cluster as the first misalignment type.

[0283] In this application, the specific size of the first threshold is not limited and can be determined according to the actual situation.

[0284] Thus, by focusing on the difference in misalignment between the outermost and innermost tabs, tab clusters of the first misalignment type can be quickly identified. This method only requires obtaining the misalignment amounts of the outermost and innermost tabs, and then calculating the first difference between them. Therefore, this method requires analyzing fewer tabs, reducing computational load, while still achieving a certain level of accuracy and high analytical efficiency.

[0285] In cases where the second characteristic tab includes at least the outermost tab, the innermost tab, and the middle tab of the tab cluster, a specific implementation is provided here. Figure 22 This is a flowchart illustrating a tenth battery cell winding method provided in some embodiments of this application. Figure 22 As shown, S3013 may include S30133 and S30134.

[0286] S30133: Calculate the second difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the middle electrode, the third difference between the electrode misalignment of the innermost electrode and the electrode misalignment of the middle electrode, and the fourth difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the innermost electrode.

[0287] The electrode misalignment amounts of the outermost electrode, the middle electrode, and the innermost electrode are obtained respectively. Then, the differences between each pair are calculated to obtain the second, third, and fourth differences.

[0288] S30134: When both the second and third differences are greater than the second threshold and the fourth difference is less than the third threshold, the misalignment type of the pole ear cluster is determined to be the second misalignment type.

[0289] The embodiments of this application do not limit the specific size of the second threshold and the third threshold; they can be set according to the actual situation.

[0290] Thus, by obtaining the electrode misalignment of the outermost electrode, the innermost electrode, and the middle electrode, electrode clusters of the second misalignment type can be effectively captured. Moreover, this method has a relatively small computational load, high analysis efficiency, and reduces the possibility of misjudgment, making the judgment results more reliable.

[0291] In the case where the second characteristic tab includes at least the outermost tab, the innermost tab, the middle tab, the tab located at 1 / 4 of the tab cluster, and the tab located at 3 / 4 of the tab cluster, a specific implementation is provided here. Figure 23 This is a schematic flowchart illustrating an eleventh battery cell winding method provided in some embodiments of this application. Figure 23 As shown, S3013 may include S30135 and S30136.

[0292] S30135: Calculate the fifth difference between the electrode misalignment at 1 / 4 and the electrode misalignment at the middle layer, the sixth difference between the electrode misalignment at the middle layer and the electrode misalignment at 3 / 4, the seventh difference between the electrode misalignment at the innermost electrode and the electrode misalignment at the middle layer, and the eighth difference between the electrode misalignment at the middle layer and the electrode misalignment at the outermost electrode.

[0293] In this application, it is necessary to obtain the electrode misalignment amount at 1 / 4, the middle layer electrode misalignment amount, the 3 / 4 electrode misalignment amount, the innermost electrode misalignment amount, and the outermost electrode misalignment amount. Then, select two pairs of reference electrode misalignment amounts and calculate the difference between the two misalignment amounts.

[0294] S30136: When the fifth, sixth, seventh, and eighth differences are all greater than the fourth threshold, the misalignment type of the anode cluster is determined to be the third misalignment type.

[0295] The embodiments of this application do not limit the specific size of the fourth threshold; it can be set according to the actual situation.

[0296] In this way, the third type of misaligned electrode clusters can be effectively captured. Compared with the above methods, although the amount of computation is slightly increased, only five reference positions of electrodes are obtained from a large number of electrodes for analysis. The analysis efficiency is high, and this method can make accurate judgments for the third type of misaligned electrode clusters, and the judgment results are more reliable.

[0297] In practical applications, the amount of pole misalignment of each pole in the pole cluster can be obtained in different ways. Here is a specific implementation method. Figure 24 This is a schematic flowchart illustrating a twelfth battery cell winding method provided in some embodiments of this application. Figure 24 As shown, in some embodiments, for each electrode included in the electrode cluster, S3011 may include the following steps: S30111 to S30112.

[0298] S30111: Determine the tape length of the electrode based on the reference winding angle corresponding to the reference electrode tab of the first cell, the tape length of multiple electrode sheets corresponding to the electrode tab cluster, and the corresponding winding angle.

[0299] In this application, a reference tab is predetermined, which can be regarded as the tab for alignment of each layer of tabs. Therefore, based on the reference needle of the reference tab, a standard measurement value of the tape length can be obtained. Then, by combining the rotation angle of the reference needle, the tape length of multiple electrode sheets and their corresponding rotation angles of the needle, the tape length corresponding to the tab can be calculated.

[0300] S30112: Determine the electrode misalignment amount of the corresponding electrode based on the travel length of the electrode tab and the reference travel length of the reference electrode tab.

[0301] Because the reference tape length of the reference electrode tab is a relatively standard tape length, the electrode tab misalignment can be obtained by comparing it with this reference tape length. Thus, by comparing the actual tape length of each electrode tab with the reference tape length of the reference electrode tab, the misalignment of each electrode tab can be accurately quantified.

[0302] In practical applications, in addition to adjusting the target adjustment component based on multiple tab clusters and the misalignment of characteristic tabs, the thickness of the electrode sheet can also be obtained, and then the target adjustment component can be adjusted based on the thickness. Figure 25 This is a schematic flowchart illustrating a twelfth battery cell winding method provided in some embodiments of this application. Figure 25 As shown, in some embodiments, prior to S305, the method may further include:

[0303] S2501: Obtain the electrode thickness of the anode and / or cathode electrode before it enters the winding needle.

[0304] This application does not limit how the electrode thickness is obtained. In practical applications, as some optional implementation methods, an electrode thickness measuring device can be set up to directly measure the electrode thickness. Alternatively, the electrode thickness can be predicted using an electrode thickness rebound model.

[0305] S2502: Adjust the winding diameter of the winding needle and / or the roller pressure of the embossing roller based on the electrode thickness before entering the winding needle.

[0306] Thus, this embodiment can adjust the winding diameter of the winding needle and / or the roller pressure of the embossing roller according to the thickness of the corresponding electrode sheet used to generate the battery cell. Compared with adjusting the electrode sheet thickness of the previous battery cell, it can reduce the impact of thickness deviation caused by different electrode sheet thicknesses on the electrode tab misalignment. Therefore, by adjusting the winding diameter of the winding needle and / or the roller pressure of the embossing roller based on the electrode sheet thickness obtained in advance before the electrode sheet used to wind the second battery cell enters the winding needle, this embodiment can further improve the electrode tab misalignment.

[0307] To reduce hardware costs, this embodiment provides a feasible implementation method that uses a thickness rebound model to predict electrode thickness. Figure 26 This is a schematic flowchart illustrating a thirteenth battery cell winding method provided in some embodiments of this application. Figure 26 As shown, in some embodiments, S1801 may include:

[0308] S25011: Obtain the thickness of the anode and / or cathode electrode after cold pressing.

[0309] When the electrode is subjected to pressure during processing such as cold pressing, it deforms. When the pressure is removed, the electrode thickness rebounds to a certain extent.

[0310] S25012: Input the cold-pressed electrode thickness into the electrode thickness rebound model to predict the electrode thickness of the anode and / or cathode electrodes before they enter the winding needle.

[0311] The establishment of an electrode thickness rebound model requires comprehensive consideration of various factors such as the material properties, process parameters, and actual production conditions of the electrode. The electrode thickness after cold pressing can be predicted by the electrode thickness after cold pressing.

[0312] Therefore, using the electrode thickness rebound model to predict electrode thickness can save hardware costs compared to using hardware devices to acquire thickness data.

[0313] In summary, this application uses a first battery cell that has already been wound to adjust the target adjustment component. Then, based on the target adjustment component with adjusted parameters, the anode plate, diaphragm, and cathode plate are wound to obtain a second battery cell, thereby solving the problem of electrode misalignment in the first battery cell. A specific implementation method is illustrated below.

[0314] First, it is necessary to obtain the misalignment type of the multiple tab clusters of the first battery cell, specifically including the first misalignment type, the second misalignment type, or the third misalignment type. For each tab cluster, it can be determined through the second characteristic tab; specifically, the following methods can be used to determine whether a tab cluster belongs to the above-mentioned misalignment type:

[0315] 1. Electrode characteristics: Electrodes include the outermost electrode and the innermost electrode. By the first difference between the electrode misalignment of the outermost electrode and the innermost electrode, if the first difference is greater than the first threshold, the misalignment type of the electrode cluster is determined to be the first misalignment type.

[0316] 2. The second characteristic tab includes at least the outermost tab, the innermost tab, and the middle tab of the tab cluster. By calculating the differences between the tab misalignment amounts of each tab, a second difference, a third difference, and a fourth difference are obtained. If both the second and third differences are greater than the second threshold and the fourth difference is less than the third threshold, the misalignment type of the tab cluster is determined to be the second misalignment type.

[0317] 3. The second characteristic awl includes at least the outermost awl, the innermost awl, the middle awl, the awl located at 1 / 4 of the awl cluster, and the awl located at 3 / 4 of the awl cluster. The fifth, sixth, seventh, and eighth differences are calculated. If all these differences are greater than the fourth threshold, the misalignment type of the awl cluster is determined to be the third misalignment type.

[0318] Based on the above method, after determining the type of each anode cluster, for each anode cluster, according to the misalignment type, the first characteristic anode and the corresponding characteristic anode misalignment amount are determined from each anode of the anode cluster.

[0319] The first characteristic awl can specifically be an awl located in a characteristic layer, with different misalignment types corresponding to different characteristic layers. For the first misalignment type, the first characteristic awl is the outermost awl, and the corresponding awl misalignment amount is the characteristic awl misalignment amount. For the second misalignment type, the first characteristic awl is an intermediate layer awl, and the corresponding awl misalignment amount is the characteristic awl misalignment amount. For the third misalignment type, the first characteristic awl consists of an awl located at 1 / 4 of the awl cluster and an awl located at 3 / 4 of the awl cluster; the larger of the two awl misalignment amounts is determined as the characteristic awl misalignment amount.

[0320] Furthermore, based on the characteristic tab misalignment amount corresponding to each tab cluster, the misalignment component corresponding to the target adjustment component is determined. For example, the average value of the characteristic tab misalignment amounts of the anode tab cluster and the cathode tab cluster can be calculated to obtain the cell characteristic tab misalignment amount of the first cell, and then the misalignment component is determined based on the cell characteristic tab misalignment amount.

[0321] When determining the misalignment component, it can be adjusted directly based on a preset weight, that is, different weights can be assigned to the needle winding roller and the embossing roller to obtain their respective misalignment components. Alternatively, based on the preset weight, a further misalignment component adjustment amount can be determined to further adjust the misalignment component.

[0322] Then, based on the misalignment types of multiple tab clusters and the corresponding misalignment components of the target adjustment component, the parameters of the target adjustment component are adjusted. The anode electrode, diaphragm, and cathode electrode are then wound around the target adjustment component with adjusted parameters to obtain the second cell. Different adjustment strategies can be adopted for the various tab misalignment types provided above. Besides unilateral misalignment, adjusting the embossing roller is mainly to change the misalignment type of the tab clusters, making them closer to or even completely unilateral misalignment. Then, adjustments are primarily made based on the winding needle to correct the misalignment problem.

[0323] For the amount of electrode misalignment, the tape length of the electrode can be determined based on the reference winding needle rotation angle corresponding to the reference electrode of the first cell, the tape length of multiple electrode sheets corresponding to the electrode cluster, and the corresponding winding needle rotation angle; then, the amount of electrode misalignment of the corresponding electrode can be determined based on the tape length of the electrode and the reference tape length of the reference electrode.

[0324] In addition, the thickness of the anode and / or cathode electrodes before entering the winding needle can be obtained based on an online thickness measuring device or an electrode thickness rebound model; then, based on the obtained electrode thickness, the winding diameter of the winding needle and / or the roller pressure of the embossing roller can be further adjusted.

[0325] On the other hand, in order to solve the above-mentioned technical problems, this application also provides a winding machine. Figure 27 This is a schematic diagram of the structure of a winding machine provided in some embodiments of this application. For example... Figure 27As shown, the winding machine includes a winding needle 2701, a controller 2702, and embossing rollers 2703 corresponding to the anode and cathode electrodes, respectively.

[0326] Controller 2702 is configured as follows:

[0327] Obtain the misalignment type of multiple tab clusters of the first cell; the multiple tab clusters include anode tab clusters and cathode tab clusters;

[0328] For each pole ear cluster, based on the misalignment type, determine the first characteristic pole ear and the corresponding characteristic pole ear misalignment amount from each pole ear of the pole ear cluster;

[0329] Based on the characteristic electrode misalignment amount corresponding to each electrode cluster, the misalignment component corresponding to the target adjustment component is determined; the target adjustment component includes a winding needle 2701 and an embossing roller 2703;

[0330] Based on the misalignment type of multiple tab clusters and the misalignment component corresponding to the target adjustment component, adjust the parameters of the target adjustment component.

[0331] The winding needle 2701 is electrically connected to the controller 2702 and is configured to wind the anode electrode, the cathode electrode, and the diaphragm (including the first diaphragm and the second diaphragm) according to the adjusted parameters to obtain the second battery cell.

[0332] The embossing rollers 2703 corresponding to the anode and cathode electrodes are electrically connected to the controller 2702. The embossing roller 2703 corresponding to the anode electrode is configured to roll the anode electrode before winding according to the adjusted parameters. The embossing roller 2703 corresponding to the cathode electrode is configured to roll the cathode electrode before winding according to the adjusted parameters.

[0333] Because the winding machine of this application adjusts the parameters of the winding needle and embossing roller based on the problem of the first battery cell through the controller, it can eliminate the current problems of the winding needle and embossing roller. Therefore, by winding the battery cell based on the adjusted winding needle and embossing roller, the misalignment degree of the tabs in each layer of the resulting second battery cell can be reduced. Furthermore, this application determines the misalignment component of the winding needle and embossing roller based on the characteristic tab misalignment amount corresponding to each tab cluster. Moreover, based on the misalignment type of the two tab clusters, it determines the adjustment scheme for the winding needle and embossing roller, achieving an organic combination of adjusting the winding needle and adjusting the embossing roller. Thus, it is evident that this application can effectively solve the problem of tab misalignment in different layers of the battery cell, thereby improving the safety performance of the battery.

[0334] The winding machine provided in this application corresponds to the cell winding method in the above embodiments. The two have the same embodiments and beneficial effects, which will not be repeated here.

[0335] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0336] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for winding a battery cell, characterized in that, include: Obtain the misalignment type of multiple tab clusters of the first battery cell; the multiple tab clusters include anode tab clusters and cathode tab clusters; For each of the said anode clusters, a first characteristic anode and the corresponding characteristic anode misalignment amount are determined from each anode of the anode cluster according to the misalignment type; Based on the misalignment amount of the characteristic electrode clusters corresponding to each of the electrode clusters, the misalignment component corresponding to the target adjustment component is determined; the target adjustment component includes a winding needle and an embossing roller; The parameters of the target adjustment component are adjusted according to the misalignment type of the plurality of electrode clusters and the misalignment component corresponding to the target adjustment component. The second cell is obtained by winding the anode electrode, diaphragm, and cathode electrode according to the target adjustment component after parameter adjustment.

2. The cell winding method according to claim 1, characterized in that, For each of the electrode clusters, determining the first characteristic electrode and the corresponding characteristic electrode misalignment amount from each electrode of the electrode cluster according to the misalignment type includes: From each of the electrodes in the electrode cluster, the electrode located in the feature layer is identified as the first feature electrode; The misalignment amount of the first characteristic electrode tab is determined based on the electrode tab misalignment amount.

3. The cell winding method according to claim 2, characterized in that, The misalignment type is the first misalignment type, and the feature layer is the outermost layer of the tabular cluster; The step of determining the characteristic electrode misalignment amount based on the electrode misalignment amount of the first characteristic electrode includes: The polarity misalignment of the outermost polarity located in the polarity cluster is determined as the characteristic polarity misalignment.

4. The cell winding method according to claim 2, characterized in that, The misalignment type is the second misalignment type, and the feature layer is the middle layer of the pole ear cluster; The step of determining the characteristic electrode misalignment amount based on the electrode misalignment amount of the first characteristic electrode includes: The amount of electrode misalignment of the electrode located in the middle layer of the electrode cluster is determined as the characteristic electrode misalignment.

5. The cell winding method according to claim 2, characterized in that, The misalignment type is the third misalignment type, and the feature layer is the electrode layer located at 1 / 4 of the electrode cluster and the electrode layer located at 3 / 4 of the electrode cluster; The step of determining the characteristic electrode misalignment amount based on the electrode misalignment amount of the first characteristic electrode includes: The larger values ​​of electrode misalignment are determined for the electrodes located at 1 / 4 and 3 / 4 of the electrode cluster; The larger value of the electrode misalignment is determined as the characteristic electrode misalignment.

6. The cell winding method according to any one of claims 1-5, characterized in that, The step of determining the misalignment component corresponding to the target adjustment component based on the characteristic pole misalignment amount corresponding to each of the pole clusters includes: The average value of the characteristic tab misalignment of the anode tab cluster and the characteristic tab misalignment of the cathode tab cluster is calculated to obtain the characteristic tab misalignment of the first cell. Based on the misalignment of the characteristic tabs of the first battery cell, the misalignment component corresponding to the target adjustment component is determined.

7. The cell winding method according to claim 6, characterized in that, The step of determining the misalignment component corresponding to the target adjustment component based on the misalignment amount of the characteristic tabs of the first battery cell includes: The initial misalignment component of the target adjustment component is determined based on the misalignment amount of the characteristic tab of the battery cell and the preset weight of the target adjustment component. Based on the initial misalignment component, the misalignment component of the target adjustment component is determined.

8. The cell winding method according to claim 7, characterized in that, Before determining the misalignment component of the target adjustment component based on the initial misalignment component, the method further includes: For the electrode misalignment of each electrode cluster, determine the misalignment quantum adjustment amount of the target adjustment component; The misalignment component adjustment amount of the target adjustment component is determined based on the misalignment component quantum adjustment amount corresponding to the anode tab cluster and the misalignment component quantum adjustment amount corresponding to the cathode tab cluster. The step of determining the misalignment component of the target adjustment component based on the initial misalignment component includes: The misalignment component of the target adjustment component is determined based on the initial misalignment component and the misalignment component adjustment amount.

9. The cell winding method according to claim 8, characterized in that, The determination of the misalignment quantum adjustment amount of the target adjustment component for the electrode misalignment amount of each electrode cluster includes: For the electrode misalignment of each electrode cluster, determine the first misalignment quantum adjustment amount of the winding needle and the second misalignment quantum adjustment amount of the embossing roller; The step of determining the misalignment component adjustment amount of the target adjustment component based on the misalignment component quantum adjustment amount corresponding to the anode tab cluster and the cathode tab cluster includes: The misalignment component adjustment amount of the winding needle is determined based on the first misalignment component adjustment amount corresponding to the anode tab cluster and the cathode tab cluster, respectively. The misalignment adjustment amount of the embossing roller is determined based on the second misalignment quantum adjustment amount corresponding to the anode tab cluster and the cathode tab cluster, respectively.

10. The cell winding method according to claim 9, characterized in that, For the electrode misalignment of each electrode cluster, the first misalignment quantum adjustment of the winding needle is determined, including: For each of the said electrode clusters, determine the difference in the amount of electrode misalignment between the outermost electrode and the innermost electrode; For each of the tab clusters, the first misalignment quantum adjustment amount of the winding needle is determined based on the misalignment difference, the number of tab layers in the tab cluster, and the preset weight of the winding needle.

11. The cell winding method according to claim 9, characterized in that, For the electrode misalignment of each electrode cluster, the second misalignment quantum adjustment amount of the embossing roller is determined, including: For each of the said electrode clusters, fit a distribution curve of the electrode misalignment of each electrode; the distribution curve satisfies a preset condition: the sum of the squares of the distances between the electrode misalignment of each electrode and the distribution curve is minimized; For each of the said electrode clusters, determine the sum of the distances between the electrode misalignment of each electrode and the distribution curve; The second misalignment component adjustment amount of the embossing roller is determined based on the sum of the distances, the number of electrode layers in the electrode cluster, and the preset weight of the embossing roller.

12. The cell winding method according to any one of claims 1-3 and 6-11, characterized in that, The misalignment type of both the cathode tab cluster and the anode tab cluster is the first misalignment type; The step of adjusting the parameters of the target adjustment component based on the misalignment type of the plurality of electrode clusters and the misalignment component corresponding to the target adjustment component specifically includes: When the outer tabs of the cathode tab cluster and the anode tab cluster are misaligned relative to the inner tabs along the winding direction, the winding diameter of the winding needle is increased according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is increased according to the misalignment component of the embossing roller. When the outer tabs of the cathode tab cluster and the anode tab cluster are misaligned relative to the inner tabs in a direction opposite to the winding direction, the winding diameter of the winding needle is reduced according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is reduced according to the misalignment component of the embossing roller. When the outer tab of the cathode tab cluster is misaligned relative to the inner tab along the winding direction, and the outer tab of the anode tab cluster is misaligned relative to the inner tab in a direction opposite to the winding direction, the winding diameter of the winding needle is reduced according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is increased according to the misalignment component of the embossing roller. When the outer tab of the cathode tab cluster is misaligned relative to the inner tab in a direction opposite to the winding direction, and the outer tab of the anode tab cluster is misaligned relative to the inner tab in the winding direction, the winding diameter of the winding needle is increased according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is decreased according to the misalignment component of the embossing roller.

13. The cell winding method according to any one of claims 1-2 and 4-11, characterized in that, The misalignment type of both the cathode tab cluster and the anode tab cluster is the second misalignment type; The step of adjusting the parameters of the target adjustment component based on the misalignment type of the plurality of electrode clusters and the misalignment component corresponding to the target adjustment component specifically includes: When the cathode tab cluster is concave in the middle on the side facing the anode tab cluster and protrudes in the middle on the side facing the cathode tab cluster, the winding diameter of the winding needle is increased according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is decreased according to the misalignment component of the embossing roller. When the cathode tab cluster protrudes in the middle on the side facing the anode tab cluster and the anode tab cluster is concave in the middle on the side facing the cathode tab cluster, the winding diameter of the winding needle is reduced according to the misalignment component of the winding needle, and the roller pressure of the embossing roller is increased according to the misalignment component of the embossing roller.

14. The cell winding method according to any one of claims 1-13, characterized in that, The misalignment types of the multiple electrode clusters of the first battery cell include: For each of the said electrode clusters, obtain the electrode misalignment amount of each electrode in the electrode cluster; From the plurality of electrodes of the electrode cluster, a second characteristic electrode is determined; The misalignment type of the electrode cluster is determined based on the electrode misalignment amount of the second characteristic electrode.

15. The cell winding method according to claim 14, characterized in that, The second characteristic electrode includes at least the outermost electrode and the innermost electrode of the electrode cluster; The step of determining the misalignment type of the electrode cluster based on the electrode misalignment amount of the second characteristic electrode includes: Calculate the first difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the innermost electrode; If the first difference is greater than the first threshold, the misalignment type of the electrode cluster is determined to be the first misalignment type.

16. The cell winding method according to claim 14, characterized in that, The second characteristic electrode includes at least the outermost electrode, the innermost electrode, and the middle electrode of the electrode cluster; Determining the misalignment type of the electrode cluster based on the misalignment amount of the second characteristic electrode includes: Calculate the second difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the middle electrode, the third difference between the electrode misalignment of the innermost electrode and the electrode misalignment of the middle electrode, and the fourth difference between the electrode misalignment of the outermost electrode and the electrode misalignment of the innermost electrode. If both the second difference and the third difference are greater than the second threshold and the fourth difference is less than the third threshold, the misalignment type of the pole ear cluster is determined to be the second misalignment type.

17. The cell winding method according to claim 14, characterized in that, The second characteristic tab includes at least the outermost tab, the innermost tab, the middle tab, the tab located at 1 / 4 of the tab cluster, and the tab located at 3 / 4 of the tab cluster; The step of determining the misalignment type of the electrode cluster based on the electrode misalignment amount of the second characteristic electrode includes: Calculate the fifth difference between the electrode misalignment of the electrode at the 1 / 4 position and the electrode misalignment of the intermediate layer electrode, the sixth difference between the electrode misalignment of the intermediate layer electrode and the electrode misalignment of the electrode at the 3 / 4 position, the seventh difference between the electrode misalignment of the innermost electrode and the electrode misalignment of the intermediate layer electrode, and the eighth difference between the electrode misalignment of the intermediate layer electrode and the electrode misalignment of the outermost electrode. If the fifth, sixth, seventh, and eighth differences are all greater than the fourth threshold, the misalignment type of the pole ear cluster is determined to be the third misalignment type.

18. The cell winding method according to any one of claims 14-17, characterized in that, The step of obtaining the pole misalignment amount of each pole in the pole cluster includes: For each electrode included in the electrode cluster, the following steps are performed: The tape length of the electrode is determined based on the rotation angle of the reference winding needle corresponding to the reference electrode tab of the first cell, the tape length of multiple electrode sheets corresponding to the electrode tab cluster, and the rotation angle of the corresponding winding needle. The electrode misalignment amount of the corresponding electrode is determined based on the travel length of the electrode tab and the reference travel length of the reference electrode tab.

19. The cell winding method according to any one of claims 1-18, characterized in that, Before the second battery cell is obtained by winding the anode electrode, diaphragm, and cathode electrode according to the target adjustment component adjusted according to the parameters, the method further includes: Obtain the electrode thickness of the anode and / or cathode electrode before it enters the winding needle; Based on the electrode thickness before entering the embossing needle, adjust the winding diameter of the embossing needle and / or the roller pressure of the embossing roller.

20. The cell winding method according to claim 19, characterized in that, The process of obtaining the electrode thickness before the anode and / or cathode electrodes enter the winding needle includes: Obtain the electrode thickness of the anode and / or cathode electrode after cold pressing; The thickness of the cold-pressed electrode is input into the electrode thickness rebound model to predict the electrode thickness of the anode and / or cathode electrode before they enter the winding needle.

21. A winding machine, characterized in that, include: Needle winding, controller, and embossing rollers corresponding to the anode and cathode electrodes; The controller is configured to: Obtain the misalignment type of multiple tab clusters of the first battery cell; the multiple tab clusters include anode tab clusters and cathode tab clusters; For each of the said anode clusters, a first characteristic anode and the corresponding characteristic anode misalignment amount are determined from each anode of the anode cluster according to the misalignment type; Based on the misalignment amount of the characteristic tabs corresponding to each tab cluster, the misalignment component corresponding to the target adjustment component is determined; the target adjustment component includes the winding needle and the embossing roller; The parameters of the target adjustment component are adjusted according to the misalignment type of the plurality of electrode clusters and the misalignment component corresponding to the target adjustment component. The winding needle is electrically connected to the controller and is configured to wind the anode plate, cathode plate, and diaphragm according to the adjusted parameters to obtain a second battery cell. The embossing rollers corresponding to the anode and cathode electrodes are electrically connected to the controller. The embossing roller corresponding to the anode electrode is configured to roll the anode electrode before winding according to the adjusted parameters. The embossing roller corresponding to the cathode electrode is configured to roll the cathode electrode before winding according to the adjusted parameters.

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