Pole piece deviation correction method, system, device and storage medium

Abstract

The application belongs to the technical field of battery cell manufacturing, and discloses a pole piece deviation rectification method, system, device and storage medium. In the winding process of the battery cell, in response to the roll changing operation of the anode pole piece and / or the cathode pole piece, the film width change amount of the pole piece after roll changing relative to the same type pole piece before roll changing is obtained, and the cladding width of the anode pole piece coating area to the cathode pole piece coating area on the tab side and the slitting side of the wound battery cell before roll changing is obtained, wherein the film width is the width of the coating area on the pole piece; based on the film width change amount and the cladding width, the cladding width of the wound battery cell after roll changing on the tab side and the slitting side is predicted; the deviation amount between the cladding width of the wound battery cell on the tab side and the slitting side is determined; and based on the deviation amount, the transverse position of the anode pole piece or the cathode pole piece when entering the winding needle is adjusted. The method effectively reduces the difference between the cladding width of the battery cell on the tab side and the slitting side, so that the cladding width distribution on both sides is more even.

Description

Technical Field

[0001] This application relates to the field of battery cell manufacturing technology, and in particular to an electrode correction method, system, device and storage medium. Background Technology

[0002] In the winding and manufacturing process of lithium-ion battery cells, the coverage width of the anode electrode coating area on the tab side and the cathode electrode coating area on the slit side is crucial to the cell performance. If the coverage width is unevenly distributed on both sides, it may result in insufficient coverage on one side, increasing the risk of short circuits, while on the other side, it will cause material waste and a decrease in energy density, affecting the safety and consistency of the cell.

[0003] In actual production, when changing the coils of anode or cathode electrodes, the difference in the width of the coating area between different coils causes a change in the stacking position between the anode and cathode electrodes after the rewinding. This can lead to a risk that the coating width on the tab side and the slit side may exceed the lower limit. Currently, there is a lack of effective dynamic control methods to address the coating width imbalance caused by rewinding.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this application is to provide an electrode correction method, system, device, and storage medium that can effectively reduce the difference in the coating width between the tab side and the strip side of the battery cell, making the coating width distribution on both sides more even.

[0006] In a first aspect, this application provides an electrode correction method, the method comprising the following steps:

[0007] In the cell winding process, in response to the rewinding operation of the anode electrode and / or cathode electrode, the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding is obtained, and the coverage width of the anode electrode coating area on the tab side and the slitting side of the wound cell before rewinding is obtained, wherein the film width is the width of the coating area on the electrode.

[0008] Based on the change in film width and the wrapping width, the wrapping width of the cell to be wound after rewinding is predicted on the tab side and the slitting side.

[0009] Determine the deviation between the wrapping width of the cell to be wound on the tab side and the slitting side;

[0010] Based on the deviation, adjust the lateral position of the anode or cathode electrode as it enters the winding needle.

[0011] In this embodiment, considering that the change in film width of the electrode sheet before and after rewinding during the cell winding process directly leads to the relative positional shift of the coating areas of the anode and cathode electrodes, and consequently causes a change in the coverage width of the anode electrode coating area relative to the cathode electrode coating area on the tab side and slitting side, in response to the rewinding operation of the anode electrode and / or cathode electrode, the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding is obtained. Combined with the measured values ​​of the coverage width of the wound cell on the tab side and slitting side before rewinding, the coverage width of the cell to be wound after rewinding on the tab side and slitting side is predicted. Based on the prediction results, the deviation between the coverage width on the tab side and slitting side is determined to quantify the degree of imbalance in the coverage width distribution caused by the rewinding operation. Then, based on this deviation, the lateral position of the anode or cathode electrode sheet when entering the winding needle is adjusted. Since adjusting the winding position directly changes the stacking reference of the subsequent electrode sheets, the relative positions of the cathode and anode electrode sheets can be corrected in advance before winding begins. This effectively reduces the difference in the wrapping width between the tab side and the slitting side of the cell to be wound, achieving a uniform distribution of the wrapping width on both sides, and ultimately improving the consistency, safety and material utilization efficiency of the cell.

[0012] In some embodiments, obtaining the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding includes:

[0013] For the cathode electrode, obtain the change in electrode width after rewinding relative to before rewinding, the change in width of the first ceramic edge, and the change in width of the second ceramic edge;

[0014] The difference between the change in electrode width and the change in the width of the first ceramic edge is determined as the change in the first film width of the cathode electrode, and the difference between the change in electrode width and the change in the width of the second ceramic edge is determined as the change in the second film width of the cathode electrode.

[0015] In this embodiment, the changes in the overall electrode width and the changes in the width of the double-sided ceramic edge coating are obtained before and after the cathode electrode is rewound. The difference between the changes in electrode width and the changes in the width of the ceramic edge coating on each side is determined as the film width change on each side of the cathode electrode. Since there may be process deviations in the ceramic edge coating on the two surfaces of the cathode electrode, this method of determining the film width change on each surface can accurately reflect the actual dimensional fluctuations of the cathode electrode coating area on the two surfaces, improving the measurement accuracy of the film width change. This provides a more accurate data basis for subsequent coating width prediction and correction control, and enhances the accuracy of electrode correction.

[0016] In some embodiments, for a cathode electrode, obtaining the change in electrode width after rewinding relative to before rewinding includes:

[0017] Obtain the electrode edge positions of the cathode electrode on the tab side and the slitting side before rewinding, and the electrode edge positions of the cathode electrode on the tab side and the slitting side after rewinding.

[0018] The first change in the position of the cathode electrode at the electrode tab side edge and the second change in the position of the electrode strip side edge are determined after the rewinding relative to before the rewinding.

[0019] Based on the first change and the second change, the change in the cathode electrode width after rewinding relative to before rewinding is determined.

[0020] In this embodiment, the change in electrode width is determined by detecting the edge position changes of the cathode electrode on the tab side and the slitting side after rewinding relative to before rewinding. This accurately reflects the lateral dimensional fluctuations of the cathode electrode in the actual transport path before and after rewinding. This improves the reliability of electrode width change detection, thereby enhancing the accuracy of subsequent coating width prediction and providing solid data support for achieving high-precision electrode correction.

[0021] In some embodiments, for a cathode electrode, obtaining the change in the width of the first ceramic edge and the change in the width of the second ceramic edge after rewinding relative to before rewinding includes:

[0022] Obtain the width of the first ceramic edge of the cathode electrode before and after rewinding, and determine the change in the width of the first ceramic edge of the cathode electrode based on the width of the first ceramic edge of the cathode electrode before and after rewinding.

[0023] Obtain the width of the second ceramic edge of the cathode electrode before and after rewinding, and determine the change in the width of the second ceramic edge of the cathode electrode based on the width of the second ceramic edge of the cathode electrode before and after rewinding.

[0024] In this embodiment, considering the influence of process deviations, the ceramic edge widths of the first and second surfaces of the cathode electrode may differ, and the changes in ceramic edge widths of the first and second surfaces before and after rewinding are also inconsistent. Since the changes in the ceramic edge width of both the first and second surfaces directly affect the boundary of the effective coating area of ​​the cathode electrode, by measuring the ceramic edge widths of the two surfaces separately and determining their respective width changes, and then combining these changes to determine the film width change of the cathode electrode, the determined film width change more accurately reflects the actual offset of the cathode electrode coating area after rewinding, providing a reliable basis for accurate prediction of the coating width and electrode misalignment correction.

[0025] In some embodiments, obtaining the width of the first ceramic edge of the cathode electrode before and after rewinding includes:

[0026] Obtain multiple measurements of the width of the first ceramic edge of the cathode electrode before rewinding, and determine the width of the first ceramic edge of the cathode electrode before rewinding based on the multiple measurements of the width of the first ceramic edge.

[0027] After rewinding, obtain multiple measurements of the width of the first ceramic edge of the cathode electrode sheet, and determine the width of the first ceramic edge of the cathode electrode sheet after rewinding based on the multiple measurements of the width of the first ceramic edge.

[0028] In this embodiment, by sampling multiple measurements of the width of the first ceramic edge, the final width of the first ceramic edge is determined based on these measurements. This effectively reduces the impact of local defects or measurement noise on the detection results, improves the stability and representativeness of the ceramic edge width measurement, and thus ensures the reliability of the coating width prediction and correction control.

[0029] In some embodiments, obtaining the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding includes:

[0030] For the anode electrode, obtain the change in electrode width after rewinding relative to before rewinding;

[0031] The change in the width of the electrode is determined as the change in the film width of the anode electrode.

[0032] This application simplifies the logic for obtaining the film width variation by addressing the characteristic that the anode electrode does not have a ceramic edge. It directly uses the overall width variation of the electrode as the electrode width variation, which aligns with the actual structural characteristics of the anode electrode. This reduces detection complexity and improves algorithm execution efficiency while ensuring calculation accuracy. Furthermore, by reasonably distinguishing the structural differences between the anode and cathode electrodes and adopting differentiated processing strategies, this application achieves the universality and practicality of the electrode correction method.

[0033] In some embodiments, for the anode electrode, obtaining the change in electrode width after rewinding relative to before rewinding includes:

[0034] Obtain the electrode edge positions of the anode electrode on the tab side and the slitting side before rewinding, and the electrode edge positions of the anode electrode on the tab side and the slitting side after rewinding.

[0035] The first change in the position of the anode electrode at the edge of the electrode on the tab side and the second change in the position of the electrode on the slit side are determined after the rewinding relative to before the rewinding.

[0036] Based on the first change and the second change, the change in the width of the anode electrode after rewinding relative to before rewinding is determined.

[0037] In this embodiment, the change in electrode width is determined by detecting the edge position changes of the anode electrode on the tab side and the slitting side after rewinding relative to before rewinding. This accurately reflects the lateral dimensional fluctuations of the anode electrode in the actual transport path before and after rewinding. This improves the reliability of electrode width change detection, thereby enhancing the accuracy of subsequent coating width prediction and providing solid data support for achieving high-precision winding correction.

[0038] In some embodiments, predicting the wrapping width of the cell to be wound after rewinding on the tab side and slit side, based on the film width variation and the wrapping width of the wound cell on the tab side and slit side, includes:

[0039] The wrapping width of the wound cell on the slitting side is determined as the wrapping width of the cell to be wound on the slitting side;

[0040] The coating width of the battery cell to be wound on the tab side is determined based on the coating width of the wound cell on the tab side and the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding.

[0041] This application proposes an efficient and reasonable method for predicting coating width. Assuming the electrode position on the slit side remains stable during rewinding, the coating width of the already wound cell on the slit side is directly inherited to the cell to be wound. Meanwhile, the tab side is dynamically predicted based on the coating width of the already wound cell on the tab side and the change in film width. This strategy fully utilizes the engineering reality of using the slit side as the electrode positioning reference in the winding equipment, simplifies the calculation logic, and improves prediction efficiency and rationality.

[0042] In some embodiments, determining the wrapping width of the cell to be wound on the tab side based on the wrapping width of the wound cell on the tab side and the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding includes:

[0043] The first coverage width of the battery cell to be wound on the tab side is determined based on the first surface coverage width of the wound cell on the tab side, the change in film width of the anode electrode, and the change in the first surface film width of the cathode electrode.

[0044] The second cover width of the battery cell to be wound on the tab side is determined based on the second cover width of the wound battery cell on the tab side, the change in film width of the anode electrode, and the change in second film width of the cathode electrode.

[0045] The smaller of the first and second covering widths is determined as the covering width of the cell to be wound on the tab side.

[0046] In this embodiment, the film width changes on the first and second surfaces of the cathode electrode may be inconsistent, leading to differences in the coating width on the two surfaces of the tab side. Using an average value for characterization might mask the risk of one side having an insufficient coating width. This embodiment predicts the coating width on both tab sides based on the film width changes of the first and second surfaces before and after rewinding, and uses the smaller value as the basis for subsequent adjustments. This ensures that the correction control can cover the coating width requirement of the weakest side, effectively reducing the possibility of cell quality problems caused by insufficient local coating width.

[0047] In some embodiments, adjusting the lateral position of the anode or cathode electrode as it enters the winding needle based on the deviation includes:

[0048] Half of the deviation is determined as the in-wrap correction parameter, or the product of half of the deviation and the adjustment coefficient is determined as the in-wrap correction parameter, wherein the adjustment coefficient is a value between 0 and 1.

[0049] Based on the winding correction parameters, adjust the lateral position of the anode or cathode electrode as it enters the winding needle.

[0050] This application's embodiments achieve symmetrical adjustment of the relative positions of the cathode and anode electrodes by using half of the deviation or its weighted value as the winding correction parameter. This evenly compensates for the difference in coverage width between the tab side and the slit side, avoiding new distribution imbalances caused by excessive correction. Furthermore, the introduction of the adjustment coefficient further enhances the flexibility of the control strategy, allowing for dynamic optimization based on equipment response characteristics, material ductility, or historical data. This achieves smooth, gradual correction, improving system robustness and process stability.

[0051] In some embodiments, the wound cells include the last N cells that have been wound before the rewinding, where N is a natural number greater than 0.

[0052] The battery cells to be wound include M battery cells to be wound, where M is a natural number greater than 0.

[0053] In this embodiment, by referencing the wrapping width data of the last N wound cells before rewinding as the initial predicted value, the impact of measurement errors or instantaneous fluctuations can be reduced, making the input data more stable and reliable. Simultaneously, the control strategy is applied to the next M cells to be wound, achieving continuous compensation for the impact of rewinding. This effectively addresses deviations caused by rewinding while preventing frequent adjustments from leading to equipment instability. Suitable for large-scale, continuous production scenarios, this approach helps improve cell consistency and increase product yield.

[0054] Secondly, to achieve the above objectives, this application also proposes a cell winding system, the system comprising:

[0055] The testing equipment, set on the electrode transfer device, is used to determine, during the cell winding process, the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding, and the coverage width of the anode electrode coating area on the tab side and the slitting side of the wound cell before rewinding over the cathode electrode coating area, wherein the film width is the width of the coating area on the electrode.

[0056] A winding needle, located downstream of the detection device, is used to wind the anode and cathode electrodes to form a bare battery cell;

[0057] A processor is configured to, in response to a rewinding operation of the anode electrode and / or the cathode electrode, acquire and, based on the film width change and the wrapping width, predict the wrapping width of the cell to be wound after rewinding on the tab side and the slitting side.

[0058] The processor is also configured to determine the deviation between the wrapping width of the battery cell to be wound on the tab side and the slitting side;

[0059] A correction device is located downstream of the detection equipment and is used to adjust the lateral position of the anode or cathode electrode as it enters the winding needle based on the deviation.

[0060] The battery cell winding system provided in this application integrates detection equipment, a processor, and an actuator for correction. The processor enables closed-loop control, forming an intelligent correction system that integrates detection, analysis, decision-making, and execution. This system can sense changes in electrode film width caused by rewinding in real time, accurately predict the distribution trend of the coating width, and automatically correct the deviation, achieving dynamic balance control of the coating width during winding. The system is highly automated, significantly reducing the need for manual intervention and improving the intelligence level, product consistency, and production efficiency of battery cell manufacturing.

[0061] In some embodiments, the electrode transfer device includes an anode electrode feeding mechanism and a cathode electrode feeding mechanism, and the detection device includes multiple laser sensors and multiple first image acquisition devices;

[0062] Multiple laser sensors are respectively disposed on the slitting side and the tab side of the anode electrode feeding mechanism, and on the slitting side and the tab side of the cathode electrode feeding mechanism, for determining the electrode edge position before and after rewinding;

[0063] Multiple first image acquisition units are disposed on the cathode electrode feeding mechanism to determine the ceramic edge width on both sides of the cathode electrode before and after rewinding;

[0064] The processor is used to determine the change in film width of the anode electrode based on the electrode edge position of the anode electrode before and after rewinding, and to determine the change in film width of the cathode electrode based on the electrode edge position and the width of the ceramic edges on both sides of the cathode electrode before and after rewinding.

[0065] In this embodiment, the detection device is equipped with multiple laser sensors and multiple first image acquisition units. The laser sensors are respectively positioned on the tab side and slitting side of the anode electrode feeding mechanism and the cathode electrode feeding mechanism, enabling precise and real-time detection of the electrode edge position before and after rewinding. Simultaneously, multiple first image acquisition units are installed on the cathode electrode feeding mechanism, enabling accurate identification of the ceramic edge width on both sides of the cathode electrode before and after rewinding. This multi-sensor fusion detection architecture achieves comprehensive perception of the electrode's key geometric parameters, providing high-quality input for accurate prediction and dynamic correction of the subsequent coating width, significantly improving the accuracy and robustness of electrode correction control.

[0066] In some embodiments, the detection device includes a plurality of second image acquisition devices;

[0067] Multiple second image acquisition devices are respectively disposed on the tab side and the slit side of the winding needle, for determining the coverage width of the wound cell on the tab side and the slit side.

[0068] In this embodiment, the detection device includes multiple second image acquisition units, respectively disposed on the tab side and the slitting side of the winding needle. This arrangement ensures that the detection position is close to the winding forming area, enabling real-time determination of the wrapping width on the tab side and the slitting side during the cell winding process. This significantly improves the measurement accuracy and timeliness of the wrapping width. It provides reliable measured data support for predicting the wrapping width trend of the cell to be wound after rewinding.

[0069] Thirdly, to achieve the above objectives, this application also proposes an electrode correction device, the device comprising: a memory, a processor, and an electrode correction program stored in the memory and running on the processor, the electrode correction program being configured to implement the steps of the electrode correction method as described above.

[0070] Fourthly, to achieve the above objectives, this application also proposes a storage medium storing an electrode correction program, wherein the electrode correction program, when executed by a processor, implements the steps of the electrode correction method described above.

[0071] 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, it can be implemented according to the contents of the specification. In order 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

[0072] 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:

[0073] Figure 1 A schematic flowchart illustrating an electrode correction method provided in some embodiments of this application;

[0074] Figure 2 A schematic diagram of the film width of an anode electrode provided for some embodiments of this application;

[0075] Figure 3 A schematic diagram of the film width of a cathode electrode provided for some embodiments of this application;

[0076] Figure 4 A schematic diagram illustrating the relative positional relationship between a laser sensor and a cathode electrode, provided for some embodiments of this application;

[0077] Figure 5 A schematic diagram of a detection process for the change in the width of a cathode electrode film is provided for some embodiments of this application;

[0078] Figure 6 A schematic diagram illustrating the relative positional relationship between a laser sensor and an anode electrode, provided for some embodiments of this application;

[0079] Figure 7 A schematic diagram of a detection process for the change in the width of an anode electrode film is provided for some embodiments of this application;

[0080] Figure 8 A schematic diagram illustrating an electrode correction process provided for some embodiments of this application;

[0081] Figure 9 This is a schematic diagram of the structure of a battery cell winding system provided for some embodiments of this application.

[0082] The reference numerals in the detailed embodiments are as follows:

[0083] 01: Anode plate;

[0084] W1: Electrode width;

[0085] W2: Membrane width;

[0086] 011: Electrode;

[0087] 02: Cathode electrode;

[0088] 021: First side of the cathode electrode;

[0089] 022: Second side of the cathode electrode;

[0090] W3: Ceramic edge width;

[0091] 031: Slicing side laser sensor;

[0092] 032: Electrode-side laser sensor;

[0093] 041: Anode electrode feeding device;

[0094] 042: Cathode electrode feeding device;

[0095] 05: Correction device;

[0096] 06: First image acquisition device;

[0097] 07: Curling needle.

[0098] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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).

[0105] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0106] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0107] In the winding and manufacturing process of lithium-ion battery cells, the coverage width of the anode electrode coating area on the tab side and the slit side relative to the cathode electrode coating area is crucial to cell performance. Uneven coverage width distribution on both sides can lead to insufficient coverage on one side, increasing the risk of short circuits, while excessive coverage on the other side can result in material waste and reduced energy density, ultimately affecting the cell's safety and consistency. In actual production, anode or cathode electrodes need to be rewound, and the coating area width varies between different rolls. This can alter the stacking position of the anode and cathode electrodes after rewinding, potentially causing the coverage width on the tab side and the slit side to exceed the lower limit.

[0108] The existing control logic involves first obtaining the wrapping width on the tab side and the slit side of a single cell after winding. Then, based on the difference in wrapping width between the two sides, the winding correction parameters of the anode or cathode electrode are adjusted before the next cell begins winding to achieve an even distribution of wrapping width on both sides. This method relies on the wrapping width of the previous cell to control the wrapping width of the next cell. When the electrode is rewound and the width of the new roll differs significantly from the width of the previous roll, the wrapping width data of the previous cell cannot be adapted to the characteristics of the new roll electrode, leading to control failure. Currently, there is a lack of effective dynamic control methods to address the wrapping width imbalance caused by rewinding operations.

[0109] In this application, considering that the change in film width of the electrode sheet before and after rewinding during the cell winding process directly leads to the relative positional shift of the coating areas of the anode and cathode electrodes, and consequently causes a change in the coverage width of the anode electrode coating area relative to the cathode electrode coating area on the tab side and slitting side, in response to the rewinding operation of the anode electrode and / or cathode electrode, the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding is obtained. Combined with the measured values ​​of the coverage width of the wound cell on the tab side and slitting side before rewinding, the coverage width of the cell to be wound after rewinding on the tab side and slitting side is predicted. Based on the prediction results, the deviation between the coverage width on the tab side and slitting side is determined to quantify the degree of imbalance in the coverage width distribution caused by the rewinding operation. Then, based on this deviation, the lateral position of the anode or cathode electrode sheet when entering the winding needle is adjusted. Since adjusting the winding position directly changes the stacking reference of the subsequent electrode sheets, the relative positions of the cathode and anode electrode sheets can be corrected in advance before winding begins. This effectively reduces the difference in the wrapping width between the tab side and the slitting side of the cell to be wound, achieving a uniform distribution of the wrapping width on both sides, and ultimately improving the consistency, safety and material utilization efficiency of the cell.

[0110] The electrode correction scheme disclosed in this application can be applied to various scenarios. For example, in the scenario of rewinding anode or cathode electrodes separately: when only the anode electrode or only the cathode electrode is rewound, the scheme can combine the wrapping width of the already wound cell on the tab side and the slitting side before rewinding, and the change in film width of the corresponding rewound electrode, to predict the wrapping width of the cell to be wound on the tab side and the slitting side after rewinding; then, based on the prediction result, determine the deviation between the wrapping width on the tab side and the slitting side, and adjust the lateral position of the rewound electrode when it enters the winding needle based on the deviation, thereby avoiding the imbalance of the wrapping width on both sides of the cell to be wound. For example, in the scenario of simultaneous rewinding of anode and cathode electrodes: when the anode and cathode electrodes need to be rewound simultaneously, the change in film width of the anode and cathode electrodes is obtained separately. Combined with the coverage width data of the already wound cell before rewinding, the coverage width of the cell to be wound after rewinding is predicted on the tab side and the slitting side. Then, based on the prediction results, the lateral position of the anode or cathode electrode entering the winding needle is adjusted to effectively avoid the imbalance of coverage width on both sides of the cell to be wound caused by simultaneous rewinding.

[0111] Please refer to Figure 1 , Figure 1 A flowchart illustrating an electrode correction method provided in some embodiments of this application includes the following steps:

[0112] S10, in the cell winding process, in response to the rewinding operation of the anode electrode and / or cathode electrode, the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding is obtained, and the coverage width of the anode electrode coating area on the tab side and the slitting side of the wound cell before rewinding is obtained over the cathode electrode coating area, wherein the film width is the width of the coating area on the electrode.

[0113] S20, based on the change in film width and the wrapping width, predict the wrapping width of the cell to be wound after rewinding on the tab side and the slitting side;

[0114] S30, determine the deviation between the wrapping width of the cell to be wound on the tab side and the slitting side;

[0115] S40, based on the deviation, adjust the lateral position of the anode or cathode electrode as it enters the winding needle.

[0116] The cell winding process is a key production step in cell manufacturing. It refers to the process of winding the anode electrode, cathode electrode, and separator into a bare cell in a specific order through a cell winding system. It is the core link in forming the basic structure of the cell.

[0117] Rewinding is the process of replacing a roll of anode or cathode electrodes with a new roll of the same type to continue winding production after one roll has been used up. It is a routine operation in the winding process to ensure continuous production. Due to process variations, the electrode parameters of the new roll and the old roll may differ.

[0118] The membrane width is the width of the coated area on the electrode, and the coated area is the region on the electrode coated with the active material. (Reference) Figure 2 The film width W2 of the anode electrode 01 is equal to the electrode width W1. (Reference) Figure 3 The film width W2 of both the first surface 021 and the second surface 022 of the cathode electrode is equal to the electrode width W1 minus the ceramic edge width W3. The ceramic edge refers to a layer of white insulating ceramic material coated on the edge of the cathode electrode tab, which has the functions of insulation and protection. This ceramic edge can also be called AT11.

[0119] The change in film width is the difference between the film width of the new electrode after rewinding and the film width of the old electrode before rewinding. A positive number indicates that the film width of the new roll is greater than that of the old roll, and a negative number indicates that the film width of the new roll is less than that of the old roll. It is the core data for predicting the wrapping width of the tab side and the slit side of the cell after rewinding.

[0120] In the electrode width direction, the width of the anode electrode coating area covering the cathode electrode coating area can also be called the overhang. The cathode electrode coating area refers to the region of the electrode after removing the ceramic edge. Overhang is divided into two types: tab-side overhang and slit-side overhang, directly affecting the safety and performance stability of the battery cell. The tab-side is the side of the electrode where the tabs are located, while the slit-side is the edge formed after the electrode has undergone a slitting process, i.e., cutting wide electrode sheets into narrower sheets to meet production requirements. (Continue to refer to...) Figure 3 The electrode sheet has multiple tabs 011 on the tab side, and the other side without tabs is the slitting side.

[0121] Pre-wound cells refer to cells that have already completed the winding process before the rewinding operation. The wrapping width of the tab side and the slit side serves as the basic reference data for predicting the wrapping width of the cells to be wound after the rewinding operation. Cells to be wound refer to cells that will undergo winding after the rewinding operation. Their wrapping width needs to be predicted using the change in film width and the wrapping width of the pre-wound cells, and then production parameters are adjusted based on the prediction results.

[0122] The deviation is the difference between the wrapping width of the cell on the tab side and the wrapping width on the slitting side. Excessive deviation can lead to uneven cell performance or safety hazards. Adjusting the lateral position of the anode or cathode electrode as it enters the winding needle based on the predicted deviation between the two sides can correct the lateral offset of the electrode, reduce the actual deviation in wrapping width between the tab and slitting sides, and ensure cell quality.

[0123] The winding needle is the core component in the battery cell winding system used to wind the electrode sheets and separator to form a bare battery cell. The lateral position of the electrode sheet when it enters the winding needle directly determines the distribution of the wrapping width on the tab side and the slit side of the battery cell.

[0124] In this embodiment, considering that the change in film width of the electrode sheet before and after rewinding during the cell winding process directly leads to the relative positional shift of the coating areas of the anode and cathode electrodes, and consequently causes a change in the coverage width of the anode electrode coating area relative to the cathode electrode coating area on the tab side and slitting side, in response to the rewinding operation of the anode electrode and / or cathode electrode, the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding is obtained. Combined with the measured values ​​of the coverage width of the wound cell on the tab side and slitting side before rewinding, the coverage width of the cell to be wound after rewinding on the tab side and slitting side is predicted. Based on the prediction results, the deviation between the coverage width on the tab side and slitting side is determined to quantify the degree of imbalance in the coverage width distribution caused by the rewinding operation. Then, based on this deviation, the lateral position of the anode or cathode electrode sheet when entering the winding needle is adjusted. Since adjusting the winding position directly changes the stacking reference of the subsequent electrode sheets, the relative positions of the cathode and anode electrode sheets can be corrected in advance before winding begins. This effectively reduces the difference in the wrapping width between the tab side and the slitting side of the cell to be wound, achieving a uniform distribution of the wrapping width on both sides, and ultimately improving the consistency, safety and material utilization efficiency of the cell.

[0125] In some embodiments, obtaining the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding includes: for the cathode electrode sheet, obtaining the change in electrode sheet width after rewinding relative to the previous rewinding, the change in width of the first ceramic edge, and the change in width of the second ceramic edge; determining the difference between the change in electrode sheet width and the change in width of the first ceramic edge as the change in film width of the first surface of the cathode electrode sheet, and determining the difference between the change in electrode sheet width and the change in width of the second ceramic edge as the change in film width of the second surface of the cathode electrode sheet.

[0126] The first side and the second side refer to the front and back sides of the cathode electrode, respectively.

[0127] The change in cathode electrode width refers to the difference between the overall width of the new roll of cathode electrodes after rewinding and the overall width of the old roll of cathode electrodes before rewinding. The change in the width of the first ceramic edge refers to the difference between the width of the ceramic edge on the tab side of the first surface of the cathode electrode after rewinding and the width before rewinding. The change in the width of the second ceramic edge refers to the difference between the width of the ceramic edge on the tab side of the second surface of the cathode electrode after rewinding and the width before rewinding.

[0128] Since the film width of the cathode electrode is equal to the difference between the cathode electrode width and the ceramic edge width, the difference between the change in cathode electrode width and the change in the width of the first ceramic edge directly reflects the change in the width of the effective coated area on the first surface of the cathode electrode before and after rewinding, and can be used as the change in film width on the first surface of the cathode electrode. Similarly, the difference between the change in cathode electrode width and the change in the width of the second ceramic edge directly reflects the change in the width of the effective coated area on the second surface of the cathode electrode before and after rewinding, and can be used as the change in film width on the second surface of the cathode electrode.

[0129] In this embodiment, the changes in the overall electrode width and the changes in the width of the double-sided ceramic edge coating are obtained before and after the cathode electrode is rewound. The difference between the changes in electrode width and the changes in the width of the ceramic edge coating on each side is determined as the film width change on each side of the cathode electrode. Since there may be process deviations in the ceramic edge coating on the two surfaces of the cathode electrode, this method of determining the film width change on each surface can accurately reflect the actual dimensional fluctuations of the cathode electrode coating area on the two surfaces, improving the measurement accuracy of the film width change. This provides a more accurate data basis for subsequent coating width prediction and correction control, and enhances the accuracy of electrode correction.

[0130] In some embodiments, for a cathode electrode, obtaining the change in electrode width after rewinding relative to before rewinding includes: obtaining the electrode edge positions of the cathode electrode on the tab side and the slitting side before rewinding, and the electrode edge positions of the cathode electrode on the tab side and the slitting side after rewinding; determining a first change in the electrode edge position on the tab side and a second change in the electrode edge position on the slitting side after rewinding relative to before rewinding; and determining the change in electrode width of the cathode electrode after rewinding relative to before rewinding based on the first and second changes.

[0131] The electrode edge position refers to the specific coordinate position of the two boundaries of the electrode in the width direction. The electrode edge position on the tab side specifically refers to the coordinate position of the tab-side boundary in the width direction of the cathode electrode, which can be detected by the tab-side laser sensor of the cathode electrode. The electrode edge position on the slit side specifically refers to the coordinate position of the slit-side boundary in the width direction of the cathode electrode, which can be detected by the slit-side laser sensor of the cathode electrode. The relative positional relationship between the tab-side laser sensor 032 and the slit-side laser sensor 031 and the cathode electrode 02 is as follows: Figure 4 As shown.

[0132] In this embodiment, the first change refers to the offset of the cathode electrode tab-side edge position after rewinding relative to the edge position before rewinding, which is equal to the difference between the coordinates of the tab-side edge position after rewinding and the coordinates of the tab-side edge position before rewinding. The second change refers to the offset of the cathode electrode slit-side edge position after rewinding relative to the edge position before rewinding, which is equal to the difference between the coordinates of the slit-side edge position after rewinding and the coordinates of the slit-side edge position before rewinding.

[0133] For example, the method for determining the change in electrode width of the cathode electrode after rewinding relative to before rewinding, based on the first change and the second change, is as follows: the sum of the first change and the second change is determined as the change in electrode width of the cathode electrode after rewinding relative to before rewinding.

[0134] In this embodiment, the change in electrode width is determined by detecting the edge position changes of the cathode electrode on the tab side and the slitting side after rewinding relative to before rewinding. This accurately reflects the lateral dimensional fluctuations of the cathode electrode in the actual transport path before and after rewinding. This improves the reliability of electrode width change detection, thereby enhancing the accuracy of subsequent coating width prediction and providing solid data support for achieving high-precision electrode correction.

[0135] In some embodiments, for a cathode electrode, obtaining the change in the width of the first ceramic edge and the change in the width of the second ceramic edge after rewinding relative to before rewinding includes: obtaining the width of the first ceramic edge of the cathode electrode before and after rewinding, and determining the change in the width of the first ceramic edge of the cathode electrode based on the width of the first ceramic edge of the cathode electrode before and after rewinding; obtaining the width of the second ceramic edge of the cathode electrode before and after rewinding, and determining the change in the width of the second ceramic edge of the cathode electrode based on the width of the second ceramic edge of the cathode electrode before and after rewinding.

[0136] The width of the ceramic edge on the first side of the cathode electrode refers to the actual width of the white insulating ceramic material coated on the edge of the tab side of the first side of the cathode electrode, which can be captured by an image acquisition device installed on the first side of the cathode electrode. The width of the ceramic edge on the second side of the cathode electrode refers to the actual width of the white insulating ceramic material coated on the edge of the tab side of the second side of the cathode electrode, which can be captured by an image acquisition device installed on the second side of the cathode electrode.

[0137] For example, before and after rewinding, the image acquisition unit for the first side of the cathode electrode captures the width of the ceramic edge of the first side of the cathode electrode, and the image acquisition unit for the second side of the cathode electrode captures the width of the ceramic edge of the second side of the cathode electrode. The processor obtains this data from the image acquisition unit, and determines the difference between the width of the ceramic edge of the first side of the cathode electrode after rewinding and the width of the ceramic edge of the first side of the cathode electrode before rewinding as the change in width of the ceramic edge of the first side; the processor also determines the difference between the width of the ceramic edge of the second side of the cathode electrode after rewinding and the width of the ceramic edge of the second side of the cathode electrode before rewinding as the change in width of the ceramic edge of the second side.

[0138] In this embodiment, considering the influence of process deviations, the ceramic edge widths of the first and second surfaces of the cathode electrode may differ, and the changes in ceramic edge widths of the first and second surfaces before and after rewinding are also inconsistent. Since the changes in the ceramic edge width of both the first and second surfaces directly affect the boundary of the effective coating area of ​​the cathode electrode, by measuring the ceramic edge widths of the two surfaces separately and determining their respective width changes, and then combining these changes to determine the film width change of the cathode electrode, the determined film width change more accurately reflects the actual offset of the cathode electrode coating area after rewinding, providing a reliable basis for accurate prediction of the coating width and electrode misalignment correction.

[0139] In some embodiments, obtaining the width of the first ceramic edge of the cathode electrode before and after rewinding includes: obtaining a plurality of measured values ​​of the width of the first ceramic edge of the cathode electrode before rewinding, and determining the width of the first ceramic edge of the cathode electrode before rewinding based on the plurality of measured values; obtaining a plurality of measured values ​​of the width of the first ceramic edge of the cathode electrode after rewinding, and determining the width of the first ceramic edge of the cathode electrode after rewinding based on the plurality of measured values.

[0140] The measured value of the first ceramic edge width of the cathode electrode before rewinding refers to the single first ceramic edge width data obtained by taking multiple pictures of the first ceramic edge of the cathode electrode before the electrode rewinding operation, using an image acquisition device installed before the cathode electrode is wound into the winding position.

[0141] The measured value of the width of the first ceramic edge of the cathode electrode after rewinding refers to the single width data of the first ceramic edge obtained by taking multiple pictures of the first ceramic edge of the cathode electrode after the electrode rewinding operation, using an image acquisition device installed before the cathode electrode is wound into the winding position.

[0142] For example, the cathode electrode passes sequentially through an image acquisition unit and a laser sensor before entering the winding needle. The image acquisition unit detects the ceramic edge width before and after winding to determine the amount of change in ceramic edge width. The laser sensor detects the electrode edge position before and after winding to determine the amount of change in electrode width. It can be understood that when the cathode electrode is conveyed to the position of the laser sensor, the electrode segment between the laser sensor and the image acquisition unit has already been captured by the image acquisition unit. Therefore, the ceramic edge width captured multiple times within this electrode segment can be used as multiple measurements of the first ceramic edge width.

[0143] For example, the average of multiple measurements of the width of the first ceramic edge before rewinding is determined as the width of the first ceramic edge of the cathode electrode before rewinding; the average of multiple measurements of the width of the first ceramic edge after rewinding is determined as the width of the first ceramic edge of the cathode electrode after rewinding.

[0144] In this embodiment, by sampling multiple measurements of the width of the first ceramic edge, the final width of the first ceramic edge is determined based on these measurements. This effectively reduces the impact of local defects or measurement noise on the detection results, improves the stability and representativeness of the ceramic edge width measurement, and thus ensures the reliability of the coating width prediction and correction control.

[0145] It is understandable that the method for obtaining the width of the second ceramic edge of the cathode electrode before and after rewinding is the same as that for obtaining the width of the first ceramic edge of the cathode electrode before and after rewinding. That is, obtaining the width of the second ceramic edge of the cathode electrode before and after rewinding includes: obtaining multiple measurements of the width of the second ceramic edge of the cathode electrode before rewinding, and determining the width of the second ceramic edge of the cathode electrode before rewinding based on these multiple measurements; obtaining multiple measurements of the width of the second ceramic edge of the cathode electrode after rewinding, and determining the width of the second ceramic edge of the cathode electrode after rewinding based on these multiple measurements. The specific implementation method and beneficial effects can be referred to the above description of the process for obtaining the width of the first ceramic edge, and will not be repeated here.

[0146] Figure 5 This is a schematic diagram of the detection process for the change in the width of the cathode electrode film. After the detection process begins, it first checks whether the cathode electrode has been fed into place. Once the cathode electrode is in place, the system acquires the following data: the value of the laser sensor on the tab side, the value of the laser sensor on the slitting side, the width of the first ceramic edge on the tab side, and the width of the second ceramic edge on the tab side. Then, it calculates the changes in the width of the first ceramic edge, the electrode width, and the width of the second ceramic edge, respectively. Specifically, the change in the width of the first ceramic edge = the width of the first ceramic edge on the tab side after rewinding - the width of the first ceramic edge on the tab side before rewinding. The change in electrode width = (the value of the laser sensor on the tab side after rewinding - the value of the laser sensor on the tab side before rewinding + the value of the laser sensor on the slitting side after rewinding - the value of the laser sensor on the slitting side before rewinding) × the millimeter value corresponding to the sensor value. The change in the width of the second ceramic edge = the width of the second ceramic edge on the tab side after rewinding - the width of the second ceramic edge on the tab side before rewinding. After completing the calculation of the above three changes, the change in film width is further calculated. The change in width of the first film = the change in electrode width - the change in the width of the first ceramic edge. The change in width of the second film = the change in electrode width - the change in the width of the second ceramic edge. After calculating the change in film width, the winding process begins, where the cathode electrode is wound. After winding, the cathode electrode is cut, completing the entire process.

[0147] In some embodiments, obtaining the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding includes: for the anode electrode, obtaining the change in electrode width after rewinding relative to the electrode before rewinding; and determining the change in electrode width as the change in film width of the anode electrode.

[0148] The change in anode electrode width refers to the difference between the overall width of a new roll of anode electrodes after rewinding and the overall width of the old roll before rewinding. The structural characteristics of the anode electrode differ from those of the cathode electrode; its tab side edge is not coated with ceramic. Therefore, the overall width of the anode electrode is equal to the width of its coated area, i.e., the film width. Correspondingly, the change in film width of the anode electrode is equal to the change in electrode width.

[0149] This application simplifies the logic for obtaining the film width variation by addressing the characteristic that the anode electrode does not have a ceramic edge. It directly uses the overall width variation of the electrode as the electrode width variation, which aligns with the actual structural characteristics of the anode electrode. This reduces detection complexity and improves algorithm execution efficiency while ensuring calculation accuracy. Furthermore, by reasonably distinguishing the structural differences between the anode and cathode electrodes and adopting differentiated processing strategies, this application achieves the universality and practicality of the electrode correction method.

[0150] In some embodiments, for an anode electrode, obtaining the change in electrode width after rewinding relative to before rewinding includes: obtaining the electrode edge positions of the anode electrode on the tab side and the slitting side before rewinding, and the electrode edge positions of the anode electrode on the tab side and the slitting side after rewinding; determining a first change in the electrode edge position on the tab side and a second change in the electrode edge position on the slitting side after rewinding relative to before rewinding; and determining the change in electrode width of the anode electrode after rewinding relative to before rewinding based on the first and second changes.

[0151] The electrode edge position refers to the specific coordinate position of the two boundaries of the electrode in the width direction. The electrode edge position on the tab side specifically refers to the coordinate position of the tab-side boundary in the width direction of the anode electrode, which can be detected by the tab-side laser sensor of the anode electrode. The electrode edge position on the slit side specifically refers to the coordinate position of the slit-side boundary in the width direction of the anode electrode, which can be detected by the slit-side laser sensor of the anode electrode. The relative positional relationship between the tab-side laser sensor 032 and the slit-side laser sensor 031 and the anode electrode 01 is as follows: Figure 6 As shown.

[0152] In this embodiment, the first change refers to the offset of the anode electrode tab side edge position after rewinding relative to the edge position before rewinding, which is equal to the difference between the coordinates of the tab side edge position after rewinding and the coordinates of the tab side edge position before rewinding. The second change refers to the offset of the anode electrode slit side edge position after rewinding relative to the edge position before rewinding, which is equal to the difference between the coordinates of the slit side edge position after rewinding and the coordinates of the slit side edge position before rewinding.

[0153] For example, the method for determining the change in electrode width of the anode sheet after rewinding relative to before rewinding, based on the first change and the second change, is as follows: the sum of the first change and the second change is determined as the change in electrode width of the anode sheet after rewinding relative to before rewinding.

[0154] In this embodiment, the change in electrode width is determined by detecting the edge position changes of the anode electrode on the tab side and the slitting side after rewinding relative to before rewinding. This accurately reflects the lateral dimensional fluctuations of the anode electrode in the actual transport path before and after rewinding. This improves the reliability of electrode width change detection, thereby enhancing the accuracy of subsequent coating width prediction and providing solid data support for achieving high-precision winding correction.

[0155] Figure 7 This is a schematic diagram of the detection process for the change in film width of the anode electrode. After the detection process begins, it first checks whether the anode electrode has been fed into place. Once the anode electrode is in place, the system acquires the following data: the value from the laser sensor on the tab side and the value from the laser sensor on the slitting side. Then, based on the acquired data, the change in film width is calculated. Change in film width = (Laser sensor value on the tab side after rewinding - Laser sensor value on the tab side before rewinding + Laser sensor value on the slitting side after rewinding - Laser sensor value on the slitting side before rewinding) × the corresponding millimeter value of the sensor value. After the film width change is calculated, the winding process begins, and the anode electrode is wound. After winding is completed, the anode electrode is cut, completing the entire process.

[0156] In some embodiments, predicting the wrapping width of the cell to be wound after rewinding on the tab side and slitting side based on the change in film width and the wrapping width of the wound cell on the tab side and slitting side includes: determining the wrapping width of the wound cell on the slitting side as the wrapping width of the cell to be wound on the slitting side; and determining the wrapping width of the cell to be wound on the tab side based on the wrapping width of the wound cell on the tab side and the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding.

[0157] For example, the wrapping width of the wound cell on the slitting side and the wrapping width on the tab side can be obtained by image acquisition devices located on the slitting side and the tab side, respectively. Furthermore, since the first wrapping width on the tab side and the second wrapping width on the tab side may be different, two image acquisition devices can be set on the tab side to detect the first wrapping width and the second wrapping width on the tab side, respectively.

[0158] Since the cathode and anode electrodes are controlled for web alignment on the slitting side during the winding process, the slitting side coverage width is unaffected by rewinding if the web alignment parameters remain unchanged. Therefore, the coverage width of the already wound cell on the slitting side is directly determined as the coverage width of the cell to be wound on the slitting side. In contrast, the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding only affects the coverage width of the cell to be wound on the tab side. Therefore, by combining the coverage width of the already wound cell on the tab side and the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding, the coverage width of the cell to be wound on the tab side can be accurately calculated.

[0159] This application proposes an efficient and reasonable method for predicting coating width. Assuming the electrode position on the slit side remains stable during rewinding, the coating width of the already wound cell on the slit side is directly inherited to the cell to be wound. Meanwhile, the tab side is dynamically predicted based on the coating width of the already wound cell on the tab side and the change in film width. This strategy fully utilizes the engineering reality of using the slit side as the electrode positioning reference in the winding equipment, simplifies the calculation logic, and improves prediction efficiency and rationality.

[0160] In some embodiments, determining the wrapping width of the battery cell to be wound on the tab side based on the wrapping width of the wound cell on the tab side and the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding includes: determining the first wrapping width of the battery cell to be wound on the tab side based on the first wrapping width of the wound cell on the tab side, the change in film width of the anode electrode sheet, and the change in film width of the first surface of the cathode electrode sheet; determining the second wrapping width of the battery cell to be wound on the tab side based on the second wrapping width of the wound cell on the tab side, the change in film width of the anode electrode sheet, and the change in film width of the second surface of the cathode electrode sheet; and determining the smaller of the first wrapping width and the second wrapping width as the wrapping width of the battery cell to be wound on the tab side.

[0161] For example, determining the first coverage width of the battery cell to be wound on the tab side based on the first coverage width of the wound battery cell on the tab side, the change in film width of the anode electrode, and the change in film width of the first surface of the cathode electrode includes: adding the change in film width of the anode electrode to the first coverage width of the wound battery cell on the tab side, and subtracting the change in film width of the cathode electrode to obtain the first coverage width of the battery cell to be wound on the tab side. Similarly, determining the second coverage width of the battery cell to be wound on the tab side based on the second coverage width of the wound battery cell on the tab side, the change in film width of the anode electrode, and the change in film width of the cathode electrode includes: adding the change in film width of the anode electrode to the second coverage width of the wound battery cell on the tab side, and subtracting the change in film width of the cathode electrode to determine the second coverage width of the battery cell to be wound on the tab side.

[0162] The smaller of the first and second cover widths of the cell to be wound on the tab side directly determines whether there is a risk of the tab side cover width exceeding the lower limit. Therefore, it is used as the final cover width of the cell to be wound on the tab side for subsequent deviation calculation and correction.

[0163] In this embodiment, the film width changes on the first and second surfaces of the cathode electrode may be inconsistent, leading to differences in the coating width on the two surfaces of the tab side. Using an average value for characterization might mask the risk of one side having an insufficient coating width. This embodiment predicts the coating width on both tab sides based on the film width changes of the first and second surfaces before and after rewinding, and uses the smaller value as the basis for subsequent adjustments. This ensures that the correction control can cover the coating width requirement of the weakest side, effectively reducing the possibility of cell quality problems caused by insufficient local coating width.

[0164] In some embodiments, adjusting the lateral position of the anode or cathode electrode when it enters the winding needle based on the deviation includes: determining half of the deviation as the winding correction parameter; or, determining the product of half of the deviation and an adjustment coefficient as the winding correction parameter, wherein the adjustment coefficient is a value between 0 and 1; and adjusting the lateral position of the anode or cathode electrode when it enters the winding needle based on the winding correction parameter.

[0165] Among them, the deviation refers to the difference between the wrapping width of the cell to be wound on the tab side and the wrapping width on the slitting side. It directly reflects the degree of unevenness in the distribution of the wrapping width on both sides of the cell to be wound after rewinding and is the core basis for determining the winding correction parameters.

[0166] The winding correction parameter is used to adjust the lateral position of the anode or cathode electrode when it enters the winding needle. This parameter can correct the lateral offset of the electrode, reduce the deviation of the wrapping width between the tab side and the slit side, and ensure the quality of the battery cell.

[0167] Half of the deviation refers to the value obtained by dividing the deviation of the wrapping width between the tab side and the slit side of the battery cell to be wound by 2. Determining half of the deviation as the winding correction parameter, the core logic is to adjust the lateral position of the anode or cathode electrode when it enters the winding needle, and the adjustment amount is half of the deviation, so that the wrapping width on both sides of the battery cell to be wound approaches uniformity.

[0168] The adjustment coefficient is a dimensionless coefficient ranging from 0 to 1, and is an empirical parameter set based on the characteristics of actual production processes. Setting this coefficient can avoid problems such as electrode wrinkling and winding misalignment caused by excessive single correction amplitude, ensuring the stability of cell production through gradual adjustment. For example, when the equipment is sensitive to large adjustments, the adjustment coefficient can be set to 0.5 to achieve gentle correction. The product of half the deviation and the adjustment coefficient is determined as the winding correction parameter, which comprehensively considers the need for balanced wrapping width on both sides and the actual adjustment capability of the equipment, ensuring both the effectiveness of correction and controlling adjustment risks.

[0169] This application's embodiments achieve symmetrical adjustment of the relative positions of the cathode and anode electrodes by using half of the deviation or its weighted value as the winding correction parameter. This evenly compensates for the difference in coverage width between the tab side and the slit side, avoiding new distribution imbalances caused by excessive correction. Furthermore, the introduction of the adjustment coefficient further enhances the flexibility of the control strategy, allowing for dynamic optimization based on equipment response characteristics, material ductility, or historical data. This achieves smooth, gradual correction, improving system robustness and process stability.

[0170] In some embodiments, after determining the winding correction parameters, the lateral position of the anode or cathode electrode when entering the winding needle is adjusted based on the winding correction parameters to reduce the deviation between the wrapping width of the cell to be wound on the tab side and the slitting side.

[0171] For example, if the deviation is positive, it indicates that the wrapping width on the tab side is greater than the wrapping width on the slit side. For the anode electrode, it can be moved laterally towards the slit side, and the amount of movement is equal to the in-winding correction parameter. For the cathode electrode, it can be moved laterally towards the tab side, and the amount of movement is equal to the in-winding correction parameter.

[0172] For example, if the deviation is negative, it indicates that the wrapping width on the tab side is less than the wrapping width on the slit side. For the anode electrode, it can be moved laterally towards the tab side, and the amount of movement is equal to the in-winding correction parameter. For the cathode electrode, it can be moved laterally towards the slit side, and the amount of movement is equal to the in-winding correction parameter.

[0173] By using the above-mentioned correction and adjustment methods, the wrapping width of the cell to be wound on the slitting side and the tab side can be precisely controlled, so as to achieve a uniform distribution of the wrapping width on both sides.

[0174] In some embodiments, the wound cells include the last N cells that have been wound before the rewinding, where N is a natural number greater than 0; the cells to be wound include M cells to be wound, where M is a natural number greater than 0.

[0175] The specific values ​​of N and M can be set according to the actual situation. For example, N and M can be set to 1 respectively. That is, the wrapping width of the first cell to be wound after the rewinding is predicted based on the wrapping width of the last cell already wound before the rewinding on the tab side and the slitting side. This enables rapid prediction of the wrapping width of the first cell after the rewinding with a very simple data source and prediction logic, without the need for additional statistical calculations of multi-cell data, reducing the processor's computational load. At the same time, it specifically focuses on the first cell after the rewinding that is prone to deviation, achieving accurate and efficient control response.

[0176] For example, N is set to 3 and M is set to 1. That is, the wrapping width of the first cell to be wound after rewinding is predicted based on the wrapping width of the last three cells already wound before rewinding on the tab side and the slitting side. For example, the average wrapping width of the last three cells already wound before rewinding on the tab side and the average wrapping width on the slitting side are obtained, and the wrapping width of the first cell to be wound is predicted based on the average wrapping width of both sides. This scheme uses the average wrapping width of multiple cells as the basis for prediction, which can effectively offset the instantaneous data fluctuations of a single cell caused by detection errors, minor defects in the electrode sheet, etc., making the predicted value more consistent with the actual situation, improving the accuracy of the prediction of the wrapping width of the first cell after rewinding, and thus reducing the risk of control errors caused by data deviation.

[0177] For example, N is set to 1 and M is set to 3. That is, the wrapping width of the first three cells to be wound after rewinding is predicted based on the wrapping width of the last cell already wound before rewinding on both the tab and slit sides. For instance, the wrapping width of the first cell to be wound after rewinding is predicted based on the wrapping width of the last cell already wound before rewinding on both the tab and slit sides, and the predicted wrapping width of the first cell to be wound is used as the wrapping width of the next two cells. This allows for controlled coverage of the wrapping width of multiple consecutive cells after rewinding, reducing the number of times the web guiding device is started and stopped, and reducing mechanical wear on the equipment.

[0178] In this embodiment, by referencing the wrapping width data of the last N wound cells before rewinding as the initial predicted value, the impact of measurement errors or instantaneous fluctuations can be reduced, making the input data more stable and reliable. Simultaneously, the control strategy is applied to the next M cells to be wound, achieving continuous compensation for the impact of rewinding. This effectively addresses deviations caused by rewinding while preventing frequent adjustments from leading to equipment instability. Suitable for large-scale, continuous production scenarios, this approach helps improve cell consistency and increase product yield.

[0179] Figure 8 This is a schematic diagram illustrating an electrode alignment process provided in an embodiment of this application. (Reference) Figure 8In this process, after the last cell is wound before rewinding, the following three locations of the wound cell are measured for the wrapping width: the first wrapping width on the tab side, the second wrapping width on the tab side, and the wrapping width on the slit side. Then, it is checked whether the electrode sheet has been properly fed into place after rewinding. After the electrode sheet is properly fed into place, the following two film width change data are obtained: the film width change of the cathode electrode sheet and the film width change of the anode electrode sheet. Based on the above data, the tab side wrapping width and the slit side wrapping width of the cell to be wound are calculated, and then the winding correction parameters for the anode or cathode electrode sheet are calculated. After completing the control calculation and executing the corresponding electrode sheet correction operation, the electrode sheet is wound to obtain the cell. Using the method provided in this application, the film width change of the electrode sheet before and after rewinding can be accurately measured with an error within ±0.1 mm. Furthermore, the |Mean|+3σ difference between the tab side and the slit side wrapping width of the first cell to be wound after rewinding decreases by 20%. This effectively reduces the difference in the coverage width between the tab side and the strip side of the battery cell, resulting in a more even distribution of coverage width on both sides.

[0180] This application also proposes a battery cell winding system, the system comprising:

[0181] The testing equipment, set on the electrode transfer device, is used to determine the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding, and the coverage width of the anode electrode coating area on the cathode electrode coating area on the tab side and the slitting side of the wound battery cell before rewinding, wherein the film width is the width of the coating area on the electrode.

[0182] The winding needle, located downstream of the testing equipment, is used to wind the anode and cathode electrodes to form a bare battery cell;

[0183] The processor is used to respond to the rewinding operation of the anode and / or cathode electrode, acquire and predict the wrapping width of the cell to be wound after rewinding on the tab side and the slitting side based on the change in film width and the wrapping width.

[0184] The processor is also used to determine the amount of deviation between the wrapping width of the cell to be wound on the tab side and the slit side;

[0185] The correction device, located downstream of the detection equipment, is used to adjust the lateral position of the anode or cathode electrode as it enters the winding needle based on the deviation.

[0186] Among them, the electrode conveying device is a component in the system used to carry the anode and cathode electrodes and stably transport the electrodes to the winding needle direction, providing continuous and orderly electrode raw materials for subsequent winding processes.

[0187] The testing equipment is a component used to monitor and collect key geometric parameters of the electrode in real time. By integrating multiple sensors, it can perform high-precision detection of the change in film width of the electrode and the coverage width of the wound cell, providing basic data support for subsequent correction control.

[0188] The winding needle is the core component of the battery cell winding. It can wind the anode and cathode plates together according to specific process rules to finally form a bare battery cell. Its winding accuracy directly affects the structure and performance of the battery cell.

[0189] The correction device is an adjustment mechanism installed downstream of the detection equipment on the electrode transfer device. It can adjust the lateral position of the electrode when it enters the winding needle according to the deviation, so as to ensure that the electrode is accurately positioned during the winding process, thereby ensuring that the wrapping width of the electrode tab side and the slitting side of the cell meets the requirements.

[0190] The processor is the calculation and control module of the cell winding system. It communicates with the detection equipment and the correction device, and can receive data collected by the detection equipment, execute preset electrode correction methods, such as predicting the wrapping width of the cell to be wound on the tab side and the slitting side after the rewinding, determining the deviation, and sending the deviation to the correction device so that it can adjust the lateral position of the corresponding electrode when it enters the winding needle, so as to achieve overall control of the entire system.

[0191] The battery cell winding system provided in this application integrates detection equipment, a processor, and an actuator for correction. The processor enables closed-loop control, forming an intelligent correction system that integrates detection, analysis, decision-making, and execution. This system can sense changes in electrode film width caused by rewinding in real time, accurately predict the distribution trend of the coating width, and automatically correct the deviation, achieving dynamic balance control of the coating width during winding. The system is highly automated, significantly reducing the need for manual intervention and improving the intelligence level, product consistency, and production efficiency of battery cell manufacturing.

[0192] In some embodiments, the electrode transfer device includes an anode electrode feeding mechanism and a cathode electrode feeding mechanism, and the detection device includes multiple laser sensors and multiple first image acquisition devices;

[0193] Multiple laser sensors are respectively installed on the slitting side and the tab side of the anode electrode feeding mechanism, and on the slitting side and the tab side of the cathode electrode feeding mechanism, to determine the position of the electrode edge before and after rewinding;

[0194] Multiple first image acquisition units are set on the cathode electrode feeding mechanism to determine the ceramic edge width on both sides of the cathode electrode before and after rewinding;

[0195] The processor is used to determine the change in film width of the anode electrode based on the electrode edge position before and after rewinding, and to determine the change in film width of the cathode electrode based on the electrode edge position and the ceramic edge width on both sides before and after rewinding.

[0196] Among them, the anode sheet feeding mechanism is a device component in the system used to carry the anode sheet and stably transport it to the winding needle direction, providing continuous and orderly anode sheet raw materials for subsequent winding processes. It is a key conveying mechanism for the anode sheet to enter the winding process.

[0197] The cathode electrode feeding mechanism functions similarly to the anode electrode feeding mechanism. It is a device component specifically designed to carry the cathode electrode and accurately transport it to the winding needle direction, ensuring that the cathode electrode and anode electrode can enter the winding process together.

[0198] A laser sensor is a device that detects the position of the electrode edge by emitting a laser. In the system, it is installed on the slitting side and the tab side of the anode and cathode electrode feeding device, respectively. Its core function is to collect the position data of the electrode edge before and after rewinding, so as to provide basic detection information for subsequent calculation of the electrode film width change.

[0199] The first image acquisition unit can be installed upstream of the laser sensor on the cathode electrode feeding device. Its main function is to photograph the cathode electrode and detect the width of the ceramic edge on the cathode electrode before and after rewinding through image analysis, providing ceramic edge width data for calculating the change in cathode electrode film width. For example, there can be two first image acquisition units, corresponding to the first and second surfaces of the cathode electrode, respectively, used to detect the ceramic edge width of the first and second surfaces of the cathode electrode. For example, the first image acquisition unit can also be referred to as an AT11 inspection camera.

[0200] In this embodiment, the detection device is equipped with multiple laser sensors and multiple first image acquisition units. The laser sensors are respectively positioned on the tab side and slitting side of the anode electrode feeding mechanism and the cathode electrode feeding mechanism, enabling precise and real-time detection of the electrode edge position before and after rewinding. Simultaneously, multiple first image acquisition units are installed on the cathode electrode feeding mechanism, enabling accurate identification of the ceramic edge width on both sides of the cathode electrode before and after rewinding. This multi-sensor fusion detection architecture achieves comprehensive perception of the electrode's key geometric parameters, providing high-quality input for accurate prediction and dynamic correction of the subsequent coating width, significantly improving the accuracy and robustness of electrode correction control.

[0201] In some embodiments, the detection device includes a plurality of second image acquisition devices;

[0202] Multiple second image acquisition devices are respectively set on the tab side and the slitting side of the winding needle to determine the wrapping width of the wound cell on the tab side and the slitting side.

[0203] Multiple second image acquisition devices are respectively installed on the tab side and the slitting side of the winding needle. By taking pictures of both sides of the battery cell during the winding process, the covering width of the battery cell on the tab side and the slitting side is analyzed and detected, providing data reference for subsequent control of the covering width of the battery cell. For example, the second image acquisition device can also be called an Overhang detection camera.

[0204] For example, there may be two second image acquisition devices on the tab side, corresponding to the first and second surfaces of the cathode electrode, respectively, for detecting the width of the first and second surfaces of the cathode electrode tab side.

[0205] In this embodiment, the detection device includes multiple second image acquisition units, respectively disposed on the tab side and the slitting side of the winding needle. This arrangement ensures that the detection position is close to the winding forming area, enabling real-time determination of the wrapping width on the tab side and the slitting side during the cell winding process. This significantly improves the measurement accuracy and timeliness of the wrapping width. It provides reliable measured data support for predicting the wrapping width trend of the cell to be wound after rewinding.

[0206] Figure 9 This is a schematic diagram of a battery cell winding system. Anode electrode feeding device 041 and cathode electrode feeding device 042 are located on the left and right sides, respectively, to carry and transport the anode and cathode electrodes towards the central winding needle 07, forming a winding path. The anode electrode feeding device 041 and cathode electrode feeding device 042 are respectively equipped with: a tab-side laser sensor 032 for detecting the position of the electrode at the tab-side edge; and a slitting-side laser sensor 031 for detecting the position of the electrode at the slitting-side edge. The laser sensors acquire real-time displacement data of the electrode edges before and after winding, providing a basis for calculating the electrode width change. In addition, multiple first image acquisition units 06 are located upstream of the cathode electrode feeding device 042, respectively used to measure the ceramic edge width of the first and second surfaces of the cathode electrode. This provides a basis for calculating the ceramic edge width change of the cathode electrode. Then, the processor in the system combines the electrode width change and the ceramic edge width change to determine the film width change of the electrode, and thus determine the winding correction parameters. (Continue to refer to...) Figure 9 Multiple correction devices 05 are respectively installed downstream of the laser sensors on the anode electrode feeding device 041 and the cathode electrode feeding device 042, near the entrance of the winding needle 07. Based on the winding correction parameters calculated by the processor, they automatically adjust the lateral position of the electrode as it enters the winding needle 07 to compensate for deviations caused by changes in film width.

[0207] Furthermore, this application also proposes an electrode correction device, the device comprising: a memory, a processor, and an electrode correction program stored in the memory and running on the processor, the electrode correction program being configured to implement the steps of the electrode correction method described above.

[0208] Furthermore, this application also proposes a storage medium storing an electrode correction program, which, when executed by a processor, implements the steps of the electrode correction method described above.

[0209] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this application. In practical applications, those skilled in the art can select some or all of it to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0210] In addition, for technical details not described in detail in this embodiment, please refer to the electrode correction method provided in any embodiment of this application, which will not be repeated here.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. 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 correcting electrode polarization, characterized in that, The method includes: In the cell winding process, in response to the rewinding operation of the anode electrode and / or cathode electrode, the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding is obtained, and the coverage width of the anode electrode coating area on the tab side and the slitting side of the wound cell before rewinding is obtained, wherein the film width is the width of the coating area on the electrode. Based on the change in film width and the wrapping width, the wrapping width of the cell to be wound after rewinding is predicted on the tab side and the slitting side. Determine the deviation between the wrapping width of the cell to be wound on the tab side and the slitting side; Based on the deviation, adjust the lateral position of the anode or cathode electrode as it enters the winding needle; The step of predicting the coating width of the cell to be wound after rewinding on the tab side and the slitting side based on the film width change and the coating width includes: The wrapping width of the wound cell on the slitting side is determined as the wrapping width of the cell to be wound on the slitting side; The coating width of the battery cell to be wound on the tab side is determined based on the coating width of the wound cell on the tab side and the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding.

2. The method as described in claim 1, characterized in that, The method of obtaining the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding includes: For the cathode electrode, obtain the change in electrode width after rewinding relative to before rewinding, the change in width of the first ceramic edge, and the change in width of the second ceramic edge; The difference between the change in electrode width and the change in the width of the first ceramic edge is determined as the change in the first film width of the cathode electrode, and the difference between the change in electrode width and the change in the width of the second ceramic edge is determined as the change in the second film width of the cathode electrode.

3. The method as described in claim 2, characterized in that, For cathode electrodes, the change in electrode width after rewinding relative to before rewinding is obtained, including: Obtain the electrode edge positions of the cathode electrode on the tab side and the slitting side before rewinding, and the electrode edge positions of the cathode electrode on the tab side and the slitting side after rewinding. The first change in the position of the cathode electrode at the electrode tab side edge and the second change in the position of the electrode strip side edge are determined after the rewinding relative to before the rewinding. Based on the first change and the second change, the change in the electrode width of the cathode electrode after rewinding relative to before rewinding is determined.

4. The method as described in claim 2, characterized in that, For the cathode electrode, the changes in the width of the first ceramic edge and the second ceramic edge after rewinding relative to before rewinding are obtained, including: Obtain the width of the first ceramic edge of the cathode electrode before and after rewinding, and determine the change in the width of the first ceramic edge of the cathode electrode based on the width of the first ceramic edge of the cathode electrode before and after rewinding. Obtain the width of the second ceramic edge of the cathode electrode before and after rewinding, and determine the change in the width of the second ceramic edge of the cathode electrode based on the width of the second ceramic edge of the cathode electrode before and after rewinding.

5. The method as described in claim 4, characterized in that, The process of obtaining the width of the first ceramic edge of the cathode electrode before and after rewinding includes: Obtain multiple measurements of the width of the first ceramic edge of the cathode electrode before rewinding, and determine the width of the first ceramic edge of the cathode electrode before rewinding based on the multiple measurements of the width of the first ceramic edge. After rewinding, obtain multiple measurements of the width of the first ceramic edge of the cathode electrode sheet, and determine the width of the first ceramic edge of the cathode electrode sheet after rewinding based on the multiple measurements of the width of the first ceramic edge.

6. The method as described in claim 1, characterized in that, The method of obtaining the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding includes: For the anode electrode, obtain the change in electrode width after rewinding relative to before rewinding; The change in the width of the electrode is determined as the change in the film width of the anode electrode.

7. The method as described in claim 6, characterized in that, For the anode electrode, obtaining the change in electrode width after rewinding relative to before rewinding includes: Obtain the electrode edge positions of the anode electrode on the tab side and the slitting side before rewinding, and the electrode edge positions of the anode electrode on the tab side and the slitting side after rewinding. The first change in the position of the anode electrode at the edge of the electrode on the tab side and the second change in the position of the electrode on the slit side are determined after the rewinding relative to before the rewinding. Based on the first change and the second change, the change in the width of the anode electrode after rewinding relative to before rewinding is determined.

8. The method as described in claim 1, characterized in that, The determination of the coating width of the cell to be wound on the tab side based on the coating width of the wound cell on the tab side and the change in film width of the electrode sheet after rewinding relative to the same type of electrode sheet before rewinding includes: The first coverage width of the battery cell on the tab side is determined based on the first surface width of the wound battery cell, the change in film width of the anode electrode, and the change in the first surface film width of the cathode electrode. The second cover width of the battery cell to be wound on the tab side is determined based on the second cover width of the wound battery cell on the tab side, the change in film width of the anode electrode, and the change in second film width of the cathode electrode. The smaller of the first and second covering widths is determined as the covering width of the cell to be wound on the tab side.

9. The method according to any one of claims 1-8, characterized in that, The step of adjusting the lateral position of the anode or cathode electrode as it enters the winding needle based on the deviation includes: Half of the deviation is determined as the in-wrap correction parameter, or the product of half of the deviation and the adjustment coefficient is determined as the in-wrap correction parameter, wherein the adjustment coefficient is a value between 0 and 1. Based on the winding correction parameters, adjust the lateral position of the anode or cathode electrode as it enters the winding needle.

10. The method according to any one of claims 1-8, characterized in that, The wound cells include the last N cells that have been wound before the rewinding, where N is a natural number greater than 0. The battery cells to be wound include M battery cells to be wound, where M is a natural number greater than 0.

11. A battery cell winding system, characterized in that, The system includes: The testing equipment, set on the electrode transfer device, is used to determine, during the cell winding process, the change in film width of the electrode after rewinding relative to the same type of electrode before rewinding, and the coverage width of the anode electrode coating area on the tab side and the slitting side of the wound cell before rewinding over the cathode electrode coating area, wherein the film width is the width of the coating area on the electrode. A winding needle, located downstream of the detection device, is used to wind the anode and cathode electrodes to form a bare battery cell; The processor is configured to, in response to a rewinding operation of the anode electrode and / or the cathode electrode, acquire the film width change and the wrapping width, determine the wrapping width of the wound cell on the slitting side as the wrapping width of the cell to be wound on the slitting side after rewinding, and determine the wrapping width of the cell to be wound on the tab side based on the wrapping width of the wound cell on the tab side and the film width change of the electrode after rewinding relative to the same type of electrode before rewinding; The processor is also configured to determine the deviation between the wrapping width of the battery cell to be wound on the tab side and the slitting side; A correction device is located downstream of the detection equipment and is used to adjust the lateral position of the anode or cathode electrode as it enters the winding needle based on the deviation.

12. The system as claimed in claim 11, characterized in that, The electrode transfer device includes an anode electrode feeding mechanism and a cathode electrode feeding mechanism, and the detection device includes multiple laser sensors and multiple first image acquisition devices; Multiple laser sensors are respectively disposed on the slitting side and the tab side of the anode electrode feeding mechanism, and on the slitting side and the tab side of the cathode electrode feeding mechanism, for determining the electrode edge position before and after rewinding; Multiple first image acquisition units are disposed on the cathode electrode feeding mechanism to determine the ceramic edge width on both sides of the cathode electrode before and after rewinding; The processor is used to determine the change in film width of the anode electrode based on the electrode edge position of the anode electrode before and after rewinding, and to determine the change in film width of the cathode electrode based on the electrode edge position and the width of the ceramic edges on both sides of the cathode electrode before and after rewinding.

13. The system as described in claim 11, characterized in that, The detection device includes multiple second image acquisition components; Multiple second image acquisition devices are respectively disposed on the tab side and the slit side of the winding needle, for determining the coverage width of the wound cell on the tab side and the slit side.

14. An electrode alignment device, characterized in that, The device includes: a memory, a processor, and an electrode correction program stored in the memory and running on the processor, the electrode correction program being configured to implement the steps of the electrode correction method as described in any one of claims 1 to 10.

15. A storage medium, characterized in that, The storage medium stores an electrode correction program, which, when executed by a processor, implements the steps of the electrode correction method as described in any one of claims 1 to 10.

Images