Winding equipment, battery processing equipment and battery production line

Abstract

The invention discloses winding equipment, battery processing equipment and a battery production line and belongs to the technical field of battery manufacturing. Wherein the winding equipment comprises a first polymerization mechanism, a winding mechanism and a first detection device, and the first polymerization mechanism is used for polymerizing incoming materials at least comprising a first pole piece, a first diaphragm and a second pole piece into a first composite piece; the first detection device comprises a first image acquisition device and a processor, the first image acquisition device is located between the first aggregation mechanism and the winding mechanism and used for acquiring an edge position image of at least one of a first pole piece and a second pole piece in the first composite sheet, and the processor is used for determining an edge distance according to the edge position image; and judging whether the edge distance meets a threshold value or not.

Description

Winding equipment, battery processing equipment and battery production lines

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on international application number PCT / CN2024 / 122087 and application date 2024-09-28, Chinese patent application number 202322664538.X and application date 2023-09-28, Chinese patent application number 202311498575.6 and application date 2023-11-10, and Chinese patent application number 202410043912.0 and application date 2024-01-11. Please submit, the Chinese patent application with application number 202420072183.7 and application date of 2024-01-11, the Chinese patent application with application number 202410557866.6 and application date of 2024-05-07, and the Chinese patent application with application number 202410557506.6 and application date of 2024-05-07, and claim the priority of the above Chinese patent applications. The entire contents of the above Chinese patent applications are hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery manufacturing technology, and in particular to a winding device, a battery processing device and a battery production line. Background Art

[0004] In the related art, in the process of producing electrode assemblies using winding equipment, the cathode electrode sheet, anode electrode sheet and diaphragm are fed into the winding mechanism separately, and a detector is set at the winding mechanism to obtain the offset between each layer. This method is prone to OH (overhang) leakage problems. Summary of the Invention

[0005] The embodiments of the present application provide a winding device, a battery processing device and a battery production line. The winding device can improve the product qualification rate and improve the OH leakage problem.

[0006] In a first aspect, an embodiment of the present application provides a winding device, which is used to produce an electrode assembly, wherein the electrode assembly includes a first electrode sheet, a second electrode sheet, a first diaphragm and a second diaphragm, and the winding device includes: a first polymerization mechanism, a winding mechanism and a first detection device, the first polymerization mechanism is used to polymerize the incoming material including at least the first electrode sheet, the first diaphragm and the second electrode sheet into a first composite sheet; the winding mechanism is located downstream of the first polymerization mechanism, and is used to wind the incoming material including at least the first composite sheet to form an electrode assembly; the first detection device includes a first image acquisition device and a processor, the first image acquisition device is located between the first polymerization mechanism and the winding mechanism, and is used to obtain an edge position image of at least one of the first electrode sheet and the second electrode sheet in the first composite sheet, and the processor is used to determine the edge distance based on the edge position image, and to determine whether the edge distance meets the threshold.

[0007] In the above technical solution, by providing a first polymerization mechanism, the polymerization of the first electrode sheet, the second electrode sheet, and at least one diaphragm is completed in advance before entering the winding mechanism to obtain a first composite sheet, and by providing a first detection device, the first composite sheet is detected before entering the winding mechanism, thereby obtaining the quality of the first composite sheet, so that the first composite sheet that has passed the detection is further conveyed to the winding mechanism. Because the relative positions between the cathode and anode electrodes and between the electrode sheet and the diaphragm in the first composite sheet after polymerization are relatively stable, displacement, misalignment, etc. are not likely to occur. Therefore, after the first composite sheet that has passed the detection is wound by the winding mechanism, the OH value related to the electrode sheet remains in a qualified state, thereby improving the problem of unqualified products being wound out. Moreover, because the first composite sheet is detected before entering the winding mechanism, the first image acquisition device will not be blocked by the winding mechanism, and the head of the first composite sheet will not be blocked by the winding mechanism to form a detection blind spot. The first composite sheet can be fully detected, which is conducive to improving the OH leakage problem.

[0008] In some embodiments, the first image acquisition device is used to obtain edge position images of the first pole piece and the first diaphragm in the first composite sheet, and the edge distance includes the edge distance between the first pole piece and the first diaphragm.

[0009] In the above technical solution, it is possible to determine whether the distance between the first diaphragm and the edge of the first electrode sheet at one or both sides of the width direction of the first composite sheet meets the corresponding threshold requirements. And / or, it is possible to determine whether the distance between the first diaphragm and the edge of the first electrode sheet at the leading and / or trailing ends of the first composite sheet in the length direction meets the corresponding threshold requirements.

[0010] In some embodiments, the first image acquisition device is used to obtain edge position images of the second pole piece and the first diaphragm in the first composite sheet, and the edge distance includes the edge distance between the second pole piece and the first diaphragm.

[0011] In the above technical solution, it is possible to determine whether the distance between the first diaphragm and the edge of the second electrode sheet at one or both sides of the width direction of the first composite sheet meets the corresponding threshold requirements. And / or, it is possible to determine whether the distance between the first diaphragm and the edge of the second electrode sheet at the leading and / or trailing ends of the first composite sheet in the length direction meets the corresponding threshold requirements.

[0012] In some embodiments, the first image acquisition device is used to obtain edge position images of the first pole piece and the second pole piece in the first composite piece, or the first image acquisition device is used to obtain edge position images of the first pole piece, the second pole piece and the first diaphragm in the first composite piece; the edge distance includes the edge distance between the first pole piece and the second pole piece.

[0013] In the above technical solution, it is possible to determine whether the position of one or both sides of the first composite sheet in the width direction, and the edge distance between the first and second electrode sheets, meet corresponding threshold requirements. And / or it is possible to determine whether the position of the head and / or tail of the first composite sheet in the length direction, and the edge distance between the first and second electrode sheets, meet corresponding threshold requirements.

[0014] In some embodiments, the first image acquisition device is used to obtain a width side edge position image of the first composite sheet in the width direction, and the processor is used to determine the width edge distance based on the width side edge position image and determine whether the width edge distance meets a threshold.

[0015] In the above technical solution, the OH situation of the first composite sheet in the width direction can be judged. For example, when the detection objects are the first electrode and the first diaphragm, the position of the first composite sheet on one side or both sides in the width direction, and the edge distance of the first diaphragm beyond the first electrode meet the corresponding threshold requirements. For example, when the detection objects are the second electrode and the first diaphragm, the position of the first composite sheet on one side or both sides in the width direction, and the edge distance of the first diaphragm beyond the second electrode meet the corresponding threshold requirements. For example, when the detection objects are the second electrode and the first electrode, the position of the first composite sheet on one side or both sides in the width direction, and the edge distance of the first electrode and the second electrode meet the corresponding threshold requirements.

[0016] In some embodiments, the first image acquisition device includes a first acquisition unit, which includes two groups of CCD cameras. The two groups of CCD cameras are arranged on both sides of the first composite sheet along the thickness direction of the first composite sheet, and the two groups of CCD cameras are respectively used to obtain width side edge position images of the first composite sheet in the width direction.

[0017] In the above technical solution, images can be collected from both sides of the first composite sheet in the thickness direction, so that relatively accurate and clear image information can be obtained regardless of whether image information of the first electrode sheet or the second electrode sheet needs to be collected.

[0018] In some embodiments, each group of CCD cameras in the first acquisition unit includes two CCD cameras, and the two CCD cameras in the same group are arranged at intervals along the width direction of the first composite sheet. The two CCD cameras in the same group are respectively used to obtain width side edge position images of the two side edge positions in the width direction of the first composite sheet.

[0019] In the above technical solution, a single first acquisition unit can simultaneously acquire image information on both sides of the first composite sheet in the width direction, thereby enabling OH determination on either side and both sides of the width.

[0020] In some embodiments, the first image acquisition device includes a second acquisition unit, and the second acquisition unit includes an X-ray camera, which is used to acquire a width side edge position image of the first composite sheet in the width direction.

[0021] In the above technical solution, the second collecting portion only needs to be provided on one side of the first composite sheet in the thickness direction, and does not need to be provided on both sides of the first composite sheet in the thickness direction, thereby saving space and simplifying the setting.

[0022] In some embodiments, the first image acquisition device is used to obtain the length end edge position images of the first pole piece and the second pole piece in the length direction of the first composite piece, and the processor is used to determine the edge distance between the head and / or tail of the first pole piece and the second pole piece based on the length end edge position images of the first pole piece and the second pole piece, and to determine whether the edge distance meets the corresponding threshold.

[0023] In the above technical solution, the OH condition of the first composite sheet in the longitudinal direction can be determined. For example, the position of the head and / or tail of the first composite sheet in the longitudinal direction and whether the edge distance between the first electrode sheet and the second electrode sheet meets the corresponding threshold requirements can be determined, which can improve the problem of OH leakage.

[0024] In some embodiments, the first image acquisition device includes a third acquisition unit, which includes two groups of CCD cameras. The two groups of CCD cameras are arranged on both sides of the first composite sheet along the thickness direction of the first composite sheet, and the two groups of CCD cameras are used to obtain the head and tail edge position images of the first pole piece and the second pole piece in the length direction of the first composite sheet, respectively.

[0025] In the above technical solution, images can be collected from both sides of the thickness direction of the first composite sheet, so that the collected image information of the first pole piece and the second pole piece are relatively accurate and clear, which is conducive to more accurate judgment of the OH problem at the head and / or tail of the length of the first pole piece and the second pole piece.

[0026] In some embodiments, the first image acquisition device includes a fourth acquisition unit, which includes an X-ray camera for acquiring images of the head and tail edge positions of the first pole piece and the second pole piece in the length direction of the first composite piece.

[0027] In the above technical solution, the fourth collecting part only needs to be provided on one side of the first composite sheet in the thickness direction, and does not need to be provided on both sides in the thickness direction of the first composite sheet, thereby saving space and simplifying the arrangement.

[0028] In some embodiments, the winding device further includes: a rejection mechanism located between the first detection device and the winding mechanism, the rejection mechanism being configured to reject the first composite sheet that does not meet the threshold value based on a signal from the processor indicating that the edge distance does not meet the threshold value.

[0029] In the above technical solution, after the processor determines that the threshold is not met, the first composite sheet that does not meet the requirements can be removed and will not be wound onto the winding mechanism, thereby avoiding the outflow of defective products, controlling the quality of the wound products, avoiding the generation of winding waste, and causing unnecessary waste.

[0030] In some embodiments, the fourth feeding mechanism is disposed upstream of the first polymerization mechanism, and the first polymerization mechanism is used to polymerize the incoming material including at least the first electrode piece, the first diaphragm, the second electrode piece and the second diaphragm into a first composite sheet.

[0031] In the above technical solution, when the fourth feeding mechanism is arranged upstream of the first polymerization mechanism so that the second diaphragm is also polymerized in the first composite sheet, at this time, the first composite sheet detected by the first image acquisition device includes at least the first electrode sheet, the first diaphragm, the second electrode sheet and the second diaphragm that are stacked, which is conducive to more comprehensive detection. Moreover, the first polymerization mechanism can polymerize at least the first electrode sheet, the first diaphragm, the second electrode sheet and the second diaphragm to obtain the first composite sheet. Compared with the solution of polymerizing these four at the winding needle, it can reduce the functional requirements of the winding needle, facilitate increasing the winding speed of the winding needle, and improve production efficiency; and it can complete the polymerization of the electrode sheet and the diaphragm before winding to reduce the displacement of the electrode sheet and the diaphragm during the winding process, thereby improving the quality of the electrode assembly.

[0032] In some embodiments, the first polymerization mechanism is an edge sealing mechanism, and is used to seal and connect at least one of the two side edges of the first diaphragm and the second diaphragm in the width direction.

[0033] In the above technical solution, the edge sealing mechanism can connect the edges of the first diaphragm and the second diaphragm together to achieve edge sealing. When the external force is removed, the first diaphragm and the second diaphragm will not separate, causing the second electrode sheet to be exposed. The diaphragm is not easy to fold during the winding process of the electrode assembly, and is not easily disturbed by holes during the liquid injection process. The risk of overlapping of the second electrode sheet with the first electrode sheet and overlapping of the second electrode sheet with the shell of the battery cell is effectively reduced, thereby improving the lithium plating problem.

[0034] In some embodiments, the winding device further includes a second polymerization mechanism, which is located upstream of the first polymerization mechanism and downstream of the first feeding mechanism and the third feeding mechanism, and the second polymerization mechanism is used to polymerize the first pole piece and the first diaphragm into a second composite sheet.

[0035] In the above technical solution, by setting a second polymerization mechanism upstream of the first polymerization mechanism, the first electrode and the first diaphragm can be polymerized preferentially. The number of material layers polymerized here is relatively small, and the polymerization quality can be better controlled. The relative position of the first electrode and the first diaphragm, as well as the respective states of the first electrode and the first diaphragm can be better guaranteed, thereby improving product quality.

[0036] In some embodiments, the second polymerization structure is a composite structure, and is used to fixedly connect the first pole piece and the first diaphragm in the second composite sheet.

[0037] In the above technical solution, by setting the second polymerization mechanism as a composite mechanism, the displacement of the first pole piece relative to the first diaphragm during winding and use can be reduced, which is beneficial to improving the accuracy of the relative position between the materials, thereby improving product quality.

[0038] In some embodiments, the winding apparatus further includes: a second image acquisition device, the second image acquisition device is located between the second polymerization mechanism and the first polymerization mechanism, and is used to detect the second composite sheet.

[0039] In the above technical solution, by arranging a second image acquisition device between the second polymerization mechanism and the first polymerization mechanism, the second image acquisition device can be used to detect the second composite sheet obtained by polymerization by the second polymerization mechanism and not entering the first polymerization mechanism, so as to timely discover defects and abnormalities of the second composite sheet, so as to facilitate timely response when problems occur in the second composite sheet, thereby reducing the negative impact on subsequent processes and improving product quality.

[0040] In some embodiments, the winding device further includes: a first buffer mechanism, which is disposed between the second polymerization mechanism and the first polymerization mechanism and is used to buffer the second composite sheet.

[0041] In the above technical solution, a first cache mechanism is arranged between the second polymerization mechanism and the first polymerization mechanism. The first cache mechanism can cache part of the second composite sheet after the first electrode and the first diaphragm are polymerized. The first cache mechanism can cache part of the second composite sheet when the winding needle switches or other tension is reduced, and release the cached second composite sheet when the tension is normal, so as to reduce the negative impact of winding needle switching, electrode cutting or other situations on the feeding of the first feeding mechanism and the third feeding mechanism, and reduce the occurrence of deceleration or shutdown of the first feeding mechanism and the third feeding mechanism, so that the first feeding mechanism and the third feeding mechanism can continue to feed and improve production efficiency.

[0042] In some embodiments, the winding device includes a first cutting mechanism for cutting the first pole piece, and the first cutting mechanism is arranged between the first feeding mechanism and the second polymerization mechanism.

[0043] In the above-described technical solution, during the production process, the first buffer mechanism buffers the material and continuously transfers it downstream, allowing the winding needle to operate without deceleration, unaffected by the operation of the first cutting mechanism upstream of the first buffer mechanism. The first buffer mechanism's buffering allows the first cutting mechanism to continue feeding the second composite sheet to the first polymerization mechanism while the first cutting mechanism is severing the first electrode sheet, without reducing the winding needle speed, thereby improving winding efficiency and, consequently, overall production capacity. Furthermore, the first cutting mechanism can be spatially separated from the winding mechanism, preventing the adverse effects of cutting chips falling onto the electrode assembly being wound on the winding needle, thereby further improving the quality of the electrode assembly.

[0044] In some embodiments, the second electrode piece and the second diaphragm are fed separately into the first polymerization mechanism, and the winding device includes a second cutting mechanism for cutting the second electrode piece, and the second cutting mechanism is arranged between the second feeding mechanism and the first polymerization mechanism.

[0045] In the above technical solution, the second cutting mechanism can be arranged spatially away from the winding mechanism to solve the adverse effect of cutting chips falling into the electrode assembly wound on the winding needle on the quality of the electrode assembly, thereby helping to further improve the quality of the electrode assembly.

[0046] In some embodiments, the second cutting mechanism comprises a cam cutter.

[0047] In the above technical solution, the second cutting mechanism does not need to chase the second pole piece, and the second pole piece does not need to slow down in response to the cutting, so the second cutting mechanism can cut the second pole piece without slowing down, which can improve production capacity, and because the space requirement for chasing cutting is eliminated, it is helpful to reduce space occupancy.

[0048] In some embodiments, the winding device further includes: a third polymerization mechanism, which is located upstream of the first polymerization mechanism and downstream of the second feeding mechanism and the fourth feeding mechanism, and the third polymerization mechanism is used to polymerize the second pole piece and the second diaphragm into a third composite sheet.

[0049] In the above technical solution, a third polymerization mechanism is arranged upstream of the first polymerization mechanism, so that the second electrode and the second diaphragm can be polymerized preferentially. The number of material layers polymerized here is relatively small, and the polymerization quality can be better controlled. The relative position of the second electrode and the second diaphragm, as well as the respective states of the second electrode and the second diaphragm can be better guaranteed, thereby improving product quality.

[0050] In some embodiments, the third polymerization structure is a composite structure, and is used to fixedly connect the second pole piece and the second diaphragm in the third composite sheet.

[0051] In the above technical solution, the displacement of the second pole piece relative to the second diaphragm during winding and use can be reduced, which is beneficial to improving the accuracy of the relative positions between the various materials, thereby improving product quality.

[0052] In some embodiments, the winding apparatus further includes: a third image acquisition device, the third image acquisition device is located between the third polymerization mechanism and the first polymerization mechanism, and is used to detect the third composite sheet.

[0053] In the above technical solution, by arranging a third image acquisition device between the third polymerization mechanism and the first polymerization mechanism, the third composite sheet obtained by polymerization by the third polymerization mechanism and not entering the first polymerization mechanism can be detected by the third image acquisition device, so as to timely discover defects and abnormalities of the third composite sheet, so as to facilitate timely response when problems occur in the third composite sheet, thereby reducing the negative impact on subsequent processes and improving product quality.

[0054] In some embodiments, the winding device further includes: a second buffer mechanism, which is disposed between the third polymerization mechanism and the first polymerization mechanism and is used to buffer the third composite sheet.

[0055] In the above technical solution, the second buffer mechanism can serve as a buffer for the third composite sheet. When there is a speed differential before and after the second buffer mechanism, the second buffer mechanism can timely buffer and release a portion of the third composite sheet, thereby resolving speed reduction issues or wrinkling issues caused by insufficient tension, thereby improving production capacity and product quality. Furthermore, the second buffer mechanism can serve as a buffer for a portion of the third composite sheet after the second pole piece and the second diaphragm are polymerized. The second buffer mechanism can buffer a portion of the third composite sheet when the winding needle switches or other tension decreases, and release the buffered third composite sheet when the tension returns to normal. This reduces the negative impact of winding needle switching, pole piece shearing, or other situations on the feeding of the second and fourth feeding mechanisms, reduces the occurrence of deceleration or shutdown of the second and fourth feeding mechanisms, and thus enables the second and fourth feeding mechanisms to continuously feed materials, thereby improving production efficiency.

[0056] In some embodiments, the winding device includes a second cutting mechanism for cutting the second pole piece, and the second cutting mechanism is arranged between the second feeding mechanism and the third aggregation mechanism.

[0057] In the above technical solution, during the production process, the second buffer mechanism buffers the material and continuously transfers it downstream, allowing the winding needle to operate without deceleration, unaffected by the operations of the second cutting mechanism upstream of the second buffer mechanism. The second buffer mechanism's buffering allows the second cutting mechanism to continue feeding the third composite sheet to the third polymerization mechanism while the second electrode sheet is being cut by the second electrode sheet, without reducing the winding needle speed, thereby improving winding efficiency and, consequently, overall production capacity. Furthermore, the second cutting mechanism can be spatially separated from the winding mechanism, preventing the adverse effects of cutting chips falling onto the electrode assembly being wound on the winding needle, thereby further improving the quality of the electrode assembly.

[0058] In some embodiments, the winding device also includes: a fifth polymerization mechanism, which is located upstream of the first polymerization mechanism and downstream of the third feeding mechanism, the second feeding mechanism and the fourth feeding mechanism, and the fifth polymerization mechanism is used to polymerize the first diaphragm, the second pole piece and the second diaphragm into a fifth composite sheet.

[0059] In the above technical solution, by setting up the fifth polymerization mechanism and the first polymerization mechanism, the second diaphragm, the second electrode, the first diaphragm and the first electrode are formed into the first composite sheet through two steps in succession. In this way, the operation of forming the first composite sheet by the second diaphragm, the second electrode, the first diaphragm and the first electrode can be more strictly controlled, which helps to improve the quality of the first composite sheet, and then helps to improve the quality of the electrode assembly. By adopting the above technical solution, the fifth composite sheet containing the second electrode can be formed by the fifth polymerization mechanism first, and then the first composite sheet containing the first electrode can be formed by the first polymerization mechanism. The second electrode and the first electrode are polymerized in succession. In this way, the polymerization quality of the second electrode and the first electrode can be controlled separately, which can help to improve the quality of the first composite sheet and thus improve the quality of the electrode assembly.

[0060] In some embodiments, the fifth polymerization mechanism is an edge sealing mechanism, and is used to seal and connect at least one of the two side edges of the first diaphragm and the second diaphragm in the width direction.

[0061] In the above technical solution, the edge sealing mechanism can connect the edges of the first diaphragm and the second diaphragm together to achieve edge sealing. When the external force is removed, the first diaphragm and the second diaphragm will not separate, causing the second electrode sheet to be exposed. The diaphragm is not easily folded during the winding process of the electrode assembly, and is not easily disturbed by holes during the injection process. This effectively reduces the risk of the second electrode sheet overlapping the first electrode sheet and the second electrode sheet overlapping the battery cell shell, and improves the lithium plating problem. For example, the edge sealing mechanism can include two edge sealing rollers arranged opposite to each other, and the two edge sealing rollers can heat the edges of the first diaphragm and the second diaphragm on both sides and apply a predetermined pressure along the thickness direction to achieve edge sealing connection of the first diaphragm and the second diaphragm.

[0062] In some embodiments, the fifth polymerization mechanism is a composite mechanism, and is used to respectively fix the second electrode in the fifth composite sheet to the first diaphragm and the second diaphragm.

[0063] In the above technical solution, the displacement of the first pole piece relative to the first diaphragm and the second diaphragm during winding and use can be reduced, which is beneficial to improving the accuracy of the relative positions between the materials, thereby improving product quality.

[0064] In some embodiments, the first polymerization mechanism is a composite mechanism and is used to fixedly connect the fifth composite sheet and the first pole sheet.

[0065] In the above technical solution, when the first polymerization mechanism is a composite mechanism and is used to fixedly connect the fifth composite sheet and the first pole sheet, the offset of the first pole sheet relative to the fifth composite sheet during winding and use can be reduced, which is beneficial to improving the accuracy of the relative position between the materials, thereby improving product quality.

[0066] In some embodiments, the winding apparatus further includes: a fifth image acquisition device, the fifth image acquisition device is located between the fifth polymerization mechanism and the first polymerization mechanism, and is used to detect the fifth composite sheet.

[0067] In the above technical solution, the fifth image acquisition device can detect the fifth composite sheet, so as to obtain the polymerization status of the first diaphragm, the second electrode sheet, and the second diaphragm, so as to strictly control the quality of the fifth composite sheet, which can help improve the quality of the electrode assembly.

[0068] In some embodiments, the winding device further includes: a fourth buffer mechanism, which is disposed between the fifth polymerization mechanism and the first polymerization mechanism and is used to buffer the fifth composite sheet.

[0069] In the above technical solution, the fourth cache mechanism can cache the fifth composite sheet. When there is a speed difference before and after the fourth cache mechanism, the fourth cache mechanism can cache and release part of the fifth composite sheet in time, thereby solving the speed reduction problem or the wrinkle problem caused by insufficient tension, and improving production capacity and product quality.

[0070] In some embodiments, the winding device includes a second cutting mechanism for cutting the second pole piece, and the second cutting mechanism is arranged between the second feeding mechanism and the fifth aggregation mechanism.

[0071] In the above technical solution, when the second cutting mechanism needs to slow down to cut the second electrode sheet, the fourth buffer mechanism can release the buffered fifth composite sheet to supply it to the first polymerization mechanism, allowing the first polymerization mechanism to continuously and uninterruptedly combine the fifth composite sheet and the first electrode sheet to form the first composite sheet without stopping, thereby allowing the winding mechanism to continuously and uninterruptedly wind the first composite sheet without stopping. In this way, the winding efficiency of the winding equipment can be improved, thereby improving the production efficiency of the electrode assembly. Moreover, the second cutting mechanism can be spatially located away from the winding mechanism, eliminating the adverse effects of cutting chips falling into the electrode assembly being wound on the winding needle, thereby further improving the quality of the electrode assembly.

[0072] In some embodiments, the winding device further includes: a fifth buffer mechanism, which is disposed between the first polymerization mechanism and the winding mechanism and is used to buffer the first composite sheet.

[0073] In the above technical solution, the fifth cache mechanism can cache the first composite sheet located between the first polymerization mechanism and the winding mechanism. When there is a speed difference before and after the fifth cache mechanism, the fifth cache mechanism can cache and release part of the first composite sheet in time, thereby solving the speed reduction problem or the wrinkle problem caused by insufficient tension, and improving production capacity and product quality.

[0074] In some embodiments, the winding device includes a first cutting mechanism for cutting the first pole piece, and the first cutting mechanism is arranged between the first feeding mechanism and the first aggregation mechanism.

[0075] In the above technical solution, when the first cutting mechanism needs to slow down to cut the first electrode sheet, the fifth buffer mechanism can release the buffered first composite sheet to the winding mechanism, allowing the winding mechanism to continue winding the first composite sheet without stopping. This improves the winding efficiency of the winding equipment and thus the production efficiency of the electrode assembly. Furthermore, the first cutting mechanism can be spatially separated from the winding mechanism, preventing the adverse effects of cutting chips falling onto the electrode assembly being wound on the winding needle, thereby further improving the quality of the electrode assembly.

[0076] In some embodiments, the winding device includes a third cutting mechanism for cutting the first diaphragm and the second diaphragm, and the third cutting mechanism is provided between the first polymerization mechanism and the winding mechanism.

[0077] In the above technical solution, the length of the diaphragm can be made longer than the length of the electrode piece relatively easily, thereby meeting the design requirements of the electrode assembly, and only one third cutting mechanism needs to be provided, which can simplify the equipment, reduce costs and save space.

[0078] In some embodiments, the second membrane and the first composite sheet are joined at a location downstream of the first image acquisition device.

[0079] In the above technical solution, positioning the first image acquisition device upstream of the winding mechanism enables more comprehensive inspection of the first composite sheet, which is a three-in-one stack of the first electrode piece, the first diaphragm, and the second electrode piece, thereby reducing blind spots and improving detection accuracy. Furthermore, since both sides of the first composite sheet are electrode pieces, the frictional force experienced along its thickness during transport is consistent, making it less likely for the roller to detach from the electrode piece when passing through the transport roller.

[0080] In some embodiments, the first polymerization mechanism is a composite mechanism, and is used to fixedly connect the first electrode piece and the second electrode piece in the first composite piece to the first diaphragm.

[0081] In the above technical solution, the offset of the first pole piece relative to the first diaphragm, the offset of the second pole piece relative to the first diaphragm, and the offset of the first pole piece relative to the second pole piece can be reduced during winding and use, which is conducive to improving the accuracy of the relative position between the materials, thereby improving product quality.

[0082] In some embodiments, the winding device further includes: a sixth polymerization mechanism, the sixth polymerization mechanism is located between the first polymerization mechanism and the winding mechanism, the fourth feeding mechanism is located upstream of the sixth polymerization mechanism, and the sixth polymerization mechanism is used to polymerize the first composite sheet and the second diaphragm into a sixth composite sheet.

[0083] In the above technical solution, by providing a sixth polymerization mechanism downstream of the first polymerization mechanism, the second separator provided by the sixth polymerization mechanism can be polymerized with the first composite sheet before being fed into the winding mechanism together. This ensures a more reliable relative position of the second separator and the sixth composite sheet, making them less susceptible to shifting. This improves the reliability of the second separator insulating the first and second electrode sheets in the wound electrode assembly. Furthermore, by spacing the sixth polymerization mechanism from the winding mechanism, congestion around the winding mechanism is avoided. Furthermore, the winding equipment's separate unwinding and winding mechanisms provide a flexible and convenient layout.

[0084] In some embodiments, the sixth polymerization mechanism is an edge sealing mechanism, and is used to seal and connect the edges of both sides of the first diaphragm and the second diaphragm in the width direction.

[0085] In the above technical solution, the first diaphragm and the second diaphragm will not separate to expose the second electrode piece. The diaphragm is not easy to fold during the winding process of the electrode assembly, and is not easily disturbed by holes during the injection process. This effectively reduces the risk of the second electrode piece overlapping with the first electrode piece and the second electrode piece overlapping with the battery cell shell, and the lithium plating problem is improved.

[0086] In some embodiments, the winding device further includes: a sixth image acquisition device, which is located between the sixth polymerization mechanism and the winding mechanism and is used to detect the sixth composite sheet.

[0087] In the above technical solution, the sixth image acquisition device is located between the sixth aggregation mechanism and the winding mechanism, enabling comprehensive detection of the sixth composite sheet's condition with high accuracy. If the sixth aggregation mechanism is an edge-sealing mechanism, the sixth image acquisition device can be used to detect the edge-sealing status of the sixth composite sheet, improving edge-sealing reliability and enabling the diaphragm to reliably limit and protect the second electrode sheet.

[0088] In some embodiments, the winding device includes a third cutting mechanism for cutting the first diaphragm and the second diaphragm, and the third cutting mechanism is provided between the sixth polymerization mechanism and the winding mechanism.

[0089] In the above technical solution, the length of the diaphragm can be made longer than the length of the electrode piece relatively easily, thereby meeting the design requirements of the electrode assembly, and only one third cutting mechanism needs to be provided, which can simplify the equipment, reduce costs and save space.

[0090] In some embodiments, the winding device further includes: a sixth buffer mechanism, which is disposed between the first polymerization mechanism and the winding mechanism and is used to buffer the first composite sheet.

[0091] In the above technical solution, the sixth cache mechanism can cache the first composite sheet located between the first polymerization mechanism and the winding mechanism. When there is a speed difference before and after the sixth cache mechanism, the sixth cache mechanism can cache and release part of the first composite sheet in time, thereby solving the speed reduction problem or the wrinkle problem caused by insufficient tension, and improving production capacity and product quality.

[0092] In some embodiments, the winding device includes a first cutting mechanism for cutting the first electrode sheet and a second cutting mechanism for cutting the second electrode sheet. The first cutting mechanism is arranged between the first feeding mechanism and the first aggregation mechanism, and the second cutting mechanism is arranged between the second feeding mechanism and the first aggregation mechanism.

[0093] In the above technical solution, when the first and second electrode sheets are pre-cut before the first aggregation mechanism, the sixth buffer mechanism can buffer and release the first composite sheet, ensuring that the electrode sheet cutting does not affect the winding mechanism's winding of the electrode sheets, significantly improving winding efficiency. Furthermore, both the first and second cutting mechanisms can be spatially separated from the winding mechanism, eliminating the adverse effects of cutting chips falling onto the winding needle on the electrode assembly, thereby further improving the quality of the electrode assembly.

[0094] In some embodiments, the first pole piece, the first diaphragm, and the second pole piece are separately fed into the first polymerization mechanism.

[0095] In the above technical solution, the mechanism can be simplified, eliminating the need to set up a polymerization mechanism upstream of the first polymerization mechanism, thereby saving space.

[0096] In some embodiments, the fourth feeding mechanism and the first composite sheet converge at the winding mechanism.

[0097] In the above technical solution, the mechanism can be simplified, eliminating the need to set up a polymerization mechanism downstream of the first polymerization mechanism, thereby saving space.

[0098] In a second aspect, an embodiment of the present application provides a battery processing device, including a winding device.

[0099] The battery processing equipment provided in the embodiments of the present application, by adopting the winding equipment involved in the above embodiments, can improve the layout rationality of the winding equipment, thereby improving the layout rationality of the battery processing equipment, and is beneficial to the layout of functional devices such as the first cache device, the second cache device, the first image acquisition device, and the second image acquisition device, thereby helping to improve the quality of the electrode assembly, thereby improving the quality of the battery.

[0100] In a third aspect, an embodiment of the present application provides a battery production line, including winding equipment or battery processing equipment.

[0101] The battery production line provided in the embodiments of the present application, by adopting the winding equipment or battery processing equipment involved in the above embodiments, can improve the rationality of the layout of the winding equipment, thereby improving the rationality of the layout of the battery processing equipment, and is beneficial to the layout of functional devices such as the first cache device, the second cache device, the first image acquisition device, and the second image acquisition device, thereby helping to improve the quality of the electrode assembly, thereby improving the quality of the battery.

[0102] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0103] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0104] FIG1 is a schematic diagram of a battery provided in some embodiments of the present application;

[0105] FIG2 is a schematic diagram of a battery cell provided in some embodiments of the present application;

[0106] FIG3 is a schematic diagram of an electrode assembly provided in some embodiments of the present application;

[0107] FIG4 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0108] FIG5 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0109] FIG6 is a detection schematic diagram of a first detection mechanism provided in some embodiments of the present application;

[0110] FIG7 is a detection schematic diagram of a first detection mechanism provided in some embodiments of the present application;

[0111] FIG8 is a detection schematic diagram of a second detection mechanism provided in some embodiments of the present application;

[0112] FIG9 is a detection schematic diagram of a second detection mechanism provided in some embodiments of the present application;

[0113] FIG10 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0114] FIG11 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0115] FIG12 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0116] FIG13 is a partial enlarged view of FIG12;

[0117] FIG14 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0118] FIG15 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0119] FIG16 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0120] FIG17 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0121] FIG18 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0122] FIG19 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0123] FIG20 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0124] FIG21 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0125] FIG22 is a schematic diagram of a winding mechanism provided in some embodiments of the present application;

[0126] FIG23 is a detection schematic diagram of a seventh image acquisition device provided by some embodiments of the present application;

[0127] FIG24 is a detection schematic diagram of a tenth image acquisition device provided by some embodiments of the present application;

[0128] FIG25 is a schematic diagram of a first composite sheet provided in some embodiments of the present application;

[0129] FIG26 is a detection schematic diagram of a sixth image acquisition device provided by some embodiments of the present application;

[0130] FIG27 is a detection schematic diagram of an eighth image acquisition device provided by some embodiments of the present application;

[0131] FIG28 is a detection schematic diagram of an eighth image acquisition device provided by some embodiments of the present application;

[0132] FIG29 is a schematic diagram of a battery production line provided by some embodiments of the present application;

[0133] FIG30 is a schematic diagram of a first detection device provided in some embodiments of the present application;

[0134] FIG31 is a schematic diagram of a second collecting unit provided in some embodiments of the present application;

[0135] FIG32 is a schematic diagram of a third collecting unit provided in some embodiments of the present application;

[0136] FIG33 is a schematic diagram of a fourth collecting unit provided in some embodiments of the present application;

[0137] Figure 34 is a schematic diagram of the rejection mechanism provided in some embodiments of the present application.

[0138] Reference numerals: Battery production line 1000; Battery processing equipment 1001; Winding equipment 100; Assembly equipment 400; Stacking equipment 500; First equipment 101; Second equipment 102; First feeding mechanism 11; Second feeding mechanism 12; First conveyor belt 14; Second conveyor belt 15; Third feeding mechanism 21; Fourth feeding mechanism 22; First polymerization mechanism 31; Mechanism 1 composite roller 1 311; Mechanism 1 composite roller 2 312; First composite gap 313; Second polymerization mechanism 32; Third polymerization mechanism 33; Fourth polymerization mechanism 34; Fifth polymerization mechanism 35; Mechanism 5 composite roller 1 351; Mechanism 5 composite roller 2 352; Fifth composite gap 353; Sixth polymerization mechanism 36; Winding mechanism 40; Turret 41; Workstation 401; Winding station 4101; Finishing station 4102; Gluing station 4103; unloading station 4104; retracting station 4105; winding needle 42; finishing assembly 43; finishing roller 431; gluing roller 432; unloading mechanism 50; clamping jaw 51; platform 52; first cutting mechanism 61; first cutter 611; first stopper 612; second cutting mechanism 62; first cam cutter 621; second stopper 622; third cutting mechanism 63; second cam cutter 631; third stopper 632; first deflection correction device 66; second deflection correction device 67; third deflection correction device 68; first detection device 70; first image acquisition device 71; processor 702; first acquisition unit 711; second acquisition unit 712; third acquisition unit 713; fourth acquisition unit 714; second image acquisition device 72; third image acquisition device 73; fifth image acquisition device 75; sixth image acquisition device 76; detector 1 761; detector 2 762; Seventh image acquisition device 77; eighth image acquisition device 78; ninth image acquisition device 791; tenth image acquisition device 792; first buffer mechanism 81; first fixed roller 811; first floating roller 812; second buffer mechanism 82; fourth buffer mechanism 84; fourth fixed roller 841; fourth floating roller 842; fifth buffer mechanism 85; fifth fixed roller 851; fifth floating roller 852; sixth buffer mechanism 86; sixth fixed roller 861; sixth floating roller 862; first transmission member 91; second transmission member 92; third transmission member 93; fourth transmission member 94; fifth transmission member 95; sixth transmission member 96; first insert feeding mechanism 97; second insert feeding mechanism 98; rejecting mechanism 99; electrode assembly 200; first electrode sheet a; second electrode sheet b; first diaphragm c; second diaphragm d; first composite sheet e; second composite sheet f; third composite sheet g; fourth composite sheet h; fifth composite sheet j; sixth composite sheet k; seventh composite sheet m; Battery 300 ; battery cell 301 ; housing 3011 . DETAILED DESCRIPTION

[0139] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0140] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0141] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0142] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0143] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0144] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0145] The term "plurality" used in this application refers to two or more (including two).

[0146] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As battery applications continue to expand, market demand is also growing.

[0147] A battery cell consists of an electrode assembly, which includes a cathode electrode sheet, an anode electrode sheet, and a separator. In related art, when producing electrode assemblies using winding equipment, the cathode electrode sheet, anode electrode sheet, and separator are fed separately into the winding mechanism, and a detector is installed at the winding mechanism to detect the offset between each layer. However, this method is prone to the problem of OH (overhang) leakage.

[0148] Based on this, the present application proposes a winding device, in which the cathode and anode electrodes are first polymerized with the diaphragm and tested before entering the winding mechanism, and then wound through the winding mechanism, thereby solving the OH leakage problem.

[0149] The winding equipment of the embodiment of the present application is used to produce electrode assemblies, which can be used for battery cells, which can be used for batteries. The electrical equipment may include battery cells or batteries in any of the following embodiments. Specifically, the electrical equipment may use batteries or battery cells as power sources, and the electrical equipment may be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0150] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0151] Referring to Figures 1 and 2 , a battery 300 is installed inside the vehicle. Battery 300 can be located at the bottom, front, or rear of the vehicle. Battery 300 can be used to power the vehicle, for example, as an operating power source for the vehicle. The vehicle may also include a controller and a motor. The controller controls battery 300 to power the motor, for example, for starting the vehicle, navigation, and operating power requirements during driving.

[0152] In the embodiment of the present application, the battery 300 can not only serve as the operating power source of the vehicle, but also serve as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0153] In the embodiment of the present application, as shown in FIG1 , a battery 300 refers to a single physical module that includes one or more battery cells 301 to provide higher voltage and capacity. For example, the battery 300 mentioned in the present application may include a battery module or a battery pack. Some batteries 300 may include a casing for encapsulating one or more battery cells 301 or multiple battery modules. The casing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells 301. Of course, some batteries 300 may not include the above-mentioned casing and may be directly installed in the battery installation compartment of the electrical device.

[0154] In the present application, the battery cell 301 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of the present application do not limit this. The battery cell 301 may be cylindrical, flat, rectangular, or other shapes, and the embodiments of the present application do not limit this. The battery cell 301 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0155] For example, as shown in FIG2 , a battery cell 301 may include a shell 3011 , an electrode assembly 200 and an electrolyte. The shell 3011 is used to accommodate the electrode assembly 200 and the electrolyte. One or more electrode assemblies 200 may be accommodated in the shell 3011 of the battery cell 301 .

[0156] For example, as shown in Figure 3, electrode assembly 200 is the component within a battery cell 301 where the electrochemical reaction occurs. Electrode assembly 200 comprises multiple layers of stacked materials, such as a first electrode plate a, a second electrode plate b, a first separator c, and a second separator d. Battery cell 301 primarily operates by the movement of metal ions between the first electrode plate a and the second electrode plate b. One of the first electrode plate a and the second electrode plate b is the cathode, and the other is the anode.

[0157] The cathode electrode sheet includes a cathode current collector and a cathode active material layer. The cathode active material layer is coated on the surface of the cathode current collector. The cathode current collector not coated with the cathode active material layer protrudes from the cathode current collector coated with the cathode active material layer, and the cathode current collector not coated with the cathode active material layer serves as the cathode electrode sheet's tab. Taking lithium-ion batteries as an example, the cathode current collector can be made of aluminum, and the cathode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, among others.

[0158] The anode plate includes an anode current collector and an anode active material layer. The anode active material layer is coated on the surface of the anode current collector. The anode current collector not coated with the anode active material layer protrudes from the anode current collector coated with the anode active material layer, and the anode current collector not coated with the anode active material layer serves as the tab of the anode plate. The anode current collector can be made of copper, and the anode active material can be made of carbon, silicon, etc.

[0159] To ensure high current flow without melting, the cathode electrode has multiple tabs stacked together, and the anode electrode has multiple tabs stacked together. The separators (first separator c and second separator d) can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0160] Hereinafter, with reference to the accompanying drawings, a winding apparatus 100 for producing an electrode assembly 200 according to an embodiment of the present application will be described.

[0161] As shown in Figures 3 and 4 , the winding apparatus 100 is used to produce an electrode assembly 200, which includes a first electrode sheet a, a second electrode sheet b, a first separator c, and a second separator d. The winding apparatus 100 comprises a first polymerization mechanism 31 and a winding mechanism 40. The first polymerization mechanism 31 is used to polymerize incoming material comprising at least the first electrode sheet a, the first separator c, and the second electrode sheet b into a first composite sheet e. The winding mechanism 40, located downstream of the first polymerization mechanism 31, is used to wind the incoming material comprising at least the first composite sheet e into the electrode assembly 200.

[0162] The second electrode piece b has a different polarity than the first electrode piece a. One of the first electrode piece a and the second electrode piece b is an anode electrode piece, and the other is a cathode electrode piece. That is, the first electrode piece a can be either an anode electrode piece or a cathode electrode piece; the second electrode piece b can be either an anode electrode piece or a cathode electrode piece. For example, the first electrode piece a is an anode electrode piece, and the second electrode piece b is a cathode electrode piece. For another example, the first electrode piece a is a cathode electrode piece, and the second electrode piece b is an anode electrode piece.

[0163] The specific composition of the first composite sheet e is not limited. For example, the first composite sheet e can be a three-in-one composite sheet, in which the first diaphragm c is stacked between the first electrode sheet a and the second electrode sheet b. In this case, the winding mechanism 40 can wind the first composite sheet e and the second diaphragm d to form the electrode assembly 200. The length direction of the first composite sheet e is consistent with the length direction of the first electrode sheet a, the length direction of the second electrode sheet b, and the length direction of the first diaphragm c. The width direction of the first composite sheet e is consistent with the width direction of the first electrode sheet a, the width direction of the second electrode sheet b, and the width direction of the first diaphragm c. The thickness direction of the first composite sheet e is consistent with the thickness direction of the first electrode sheet a, the thickness direction of the second electrode sheet b, and the thickness direction of the first diaphragm c.

[0164] Alternatively, for example, the first composite sheet e may be a four-in-one composite sheet, in which the first separator c is stacked between the first electrode sheet a and the second electrode sheet b, and the second electrode sheet b is stacked between the second separator d and the first separator c. In this case, the winding mechanism 40 winds the first composite sheet e to form the electrode assembly 200. The length direction of the first composite sheet e, the length direction of the first electrode sheet a, the length direction of the second electrode sheet b, the length direction of the first separator c, and the length direction of the second separator d are all consistent. The width direction of the first composite sheet e, the width direction of the first electrode sheet a, the width direction of the second electrode sheet b, the width direction of the first separator c, and the width direction of the second separator d are all consistent. The thickness direction of the first composite sheet e, the thickness direction of the first electrode sheet a, the thickness direction of the second electrode sheet b, the thickness direction of the first separator c, and the thickness direction of the second separator d are all consistent.

[0165] Of course, the four-in-one composite sheet can also be designed as the first electrode piece a stacked between the second diaphragm d and the first diaphragm c. To simplify the description, the following mainly uses the second electrode piece b stacked between the second diaphragm d and the first diaphragm c as an example.

[0166] In the embodiments of the present application, "polymerization" is understood in a broad sense, and a specific method can be selected according to the type of material to be polymerized. For example, it can include only stacking without connection between different layers, or it can include a composite connection between the electrode and the diaphragm, or it can also include an edge sealing connection between diaphragms, etc.

[0167] For example, the term "polymerization" in the context of the first polymerizing mechanism 31 polymerizing the incoming material into the first composite sheet e should be interpreted broadly. For example, the first polymerizing mechanism 31 may simply combine the incoming material in layers along the thickness direction, or it may combine the incoming material in layers and also create an inseparable connection between the layers. The connection may include the aforementioned composite connection and edge-sealing connection. The composite connection and edge-sealing connection methods are not limited and may, for example, be formed by cold pressing, hot pressing, gluing, or the like.

[0168] For example, in the three-in-one composite sheet formed by polymerization by the first polymerization mechanism 31, the first electrode piece a and the first diaphragm c may be in contact but not connected, or they may be in contact and connected, i.e., the first electrode piece a and the first diaphragm c are partially connected or completely connected and inseparable. Similarly, the second electrode piece b and the first diaphragm c may be in contact but not connected, or they may be in contact and connected, i.e., the second electrode piece b and the first diaphragm c are partially connected or completely connected and inseparable.

[0169] For example, in the above-mentioned four-in-one composite sheet polymerized by the first polymerization mechanism 31, the first electrode a and the first diaphragm c may be in contact but not connected, or they may be in contact and connected, so that the first electrode a and the first diaphragm c are partially connected or integrally connected and inseparable. Similarly, the second electrode b and the first diaphragm c may be in contact but not connected, or they may be in contact and connected, so that the second electrode b and the first diaphragm c are partially connected or integrally connected and inseparable. The second diaphragm d and the adjacent electrode may be in contact but not connected, or they may be in contact and connected, so that the second diaphragm d and the adjacent electrode may be partially connected or integrally connected and inseparable. The edge of the first diaphragm c extending beyond the electrode and the edge of the second diaphragm d extending beyond the electrode may be unconnected, continuously connected, or intermittently connected.

[0170] Illustratively, the winding apparatus 100 includes: a first feeding mechanism 11, a second feeding mechanism 12, a third feeding mechanism 21, and a fourth feeding mechanism 22. The first feeding mechanism 11 is used to release the first electrode piece a; the second feeding mechanism 12 is used to release the second electrode piece b; the third feeding mechanism 21 is used to release the first diaphragm c; and the fourth feeding mechanism 22 is used to release the second diaphragm d.

[0171] The first feeding mechanism 11, the second feeding mechanism 12, the third feeding mechanism 21, and the fourth feeding mechanism 22 can all be unwinding mechanisms, which can carry the wound material and are used to release the wound material in the form of a strip. For example, the unwinding mechanism can be, but is not limited to, a roller, a reel, a drum, a rotating shaft, and the like. The specific design and features of the unwinding mechanism can be set according to the width and thickness of the strip material. The material can be pre-wound and placed directly on the unwinding mechanism, or it can be wound in real time by the unwinding mechanism.

[0172] For example, the unwinding mechanism can rotate to wind and release the strip of material. For example, the unwinding mechanism can be an active mechanism, i.e., the unwinding mechanism can be actively driven by an electric motor, a hydraulic system, or a pneumatic system. Alternatively, for example, the unwinding mechanism can be a passive mechanism, such as one that rotates when pulled by the winding mechanism 40 described below, thereby releasing the material in a strip.

[0173] The number of any one of the first feeding mechanism 11, the second feeding mechanism 12, the third feeding mechanism 21, and the fourth feeding mechanism 22 can be one or more, and providing multiple unwinding mechanisms allows multiple unwinding mechanisms to be used alternately to achieve continuous unwinding operations and improve production efficiency.

[0174] Exemplarily, the first feeding mechanism 11 is used to wind the first electrode piece a and release the first electrode piece a. For example, the first feeding mechanism 11 can be rotatable, so that the first feeding mechanism 11 can rotate and feed the first electrode piece a wound thereon to a subsequent mechanism. For example, the shape of the first feeding mechanism 11 can be cylindrical, prismatic or other shapes. For example, the material of the first feeding mechanism 11 can include plastic, metal or other materials. Exemplarily, the first feeding mechanism 11 that carries and releases the first electrode piece a can be one or more. When there are multiple first feeding mechanisms 11, multiple first feeding mechanisms 11 can be used alternately to achieve continuous unwinding operation of the first electrode piece a, thereby improving production efficiency.

[0175] Exemplarily, the second feeding mechanism 12 is used to wind the second electrode piece b and release the second electrode piece b. For example, the second feeding mechanism 12 can be rotatable, so that the second feeding mechanism 12 can rotate and feed the second electrode piece b wound thereon to a subsequent mechanism. For example, the shape of the second feeding mechanism 12 can be cylindrical, prismatic or other shapes. For example, the material of the second feeding mechanism 12 can include plastic, metal or other materials. Exemplarily, the second feeding mechanism 12 that carries and releases the second electrode piece b can be one or more. When there are multiple second feeding mechanisms 12, multiple second feeding mechanisms 12 can be used alternately to achieve continuous unwinding operation of the second electrode piece b, thereby improving production efficiency.

[0176] Exemplarily, the third feeding mechanism 21 is used for winding and releasing the first diaphragm c. For example, the third feeding mechanism 21 can be rotatable, so that the third feeding mechanism 21 can rotate and feed the first diaphragm c wound thereon to a subsequent mechanism. For example, the shape of the third feeding mechanism 21 can be cylindrical, prismatic, or other shapes. For example, the material of the third feeding mechanism 21 can include plastic, metal, or other materials. Exemplarily, the third feeding mechanism 21 that carries and releases the first diaphragm c can be one or more. When there are multiple third feeding mechanisms 21, multiple third feeding mechanisms 21 can be used alternately to achieve continuous unwinding of the first diaphragm c, thereby improving production efficiency.

[0177] Exemplarily, the fourth feeding mechanism 22 is used to wind the second diaphragm d and release the second diaphragm d. For example, the fourth feeding mechanism 22 can be rotatable, so that the fourth feeding mechanism 22 can rotate and feed the second diaphragm d wound thereon to a subsequent mechanism. For example, the shape of the fourth feeding mechanism 22 can be cylindrical, prismatic, or other shapes. For example, the material of the fourth feeding mechanism 22 can include plastic, metal, or other materials. Exemplarily, the fourth feeding mechanism 22 that carries and releases the second diaphragm d can be one or more. When there are multiple fourth feeding mechanisms 22, multiple fourth feeding mechanisms 22 can be used alternately to achieve continuous unwinding of the second diaphragm d, thereby improving production efficiency.

[0178] As shown in FIG4 , the winding mechanism 40 is used to wind the unwound electrode assembly 200 to obtain a wound electrode assembly 200. Exemplarily, the winding mechanism 40 may include a winding needle 42, and the rotation of the winding needle 42 can cause the strip-shaped electrode assembly 200 to be wound on the winding needle 42 to form an electrode assembly 200 of a specific shape, that is, the winding needle 42 can wind the strip-shaped electrode assembly 200 by rotating. Exemplarily, the rotation of the winding needle 42 can be driven by a motor, a hydraulic system, or a pneumatic system. Exemplarily, the shape of the winding needle 42 can be a regular shape such as a cylinder or a cone, or it can be an irregular shape. According to the different shapes of the winding needle 42, the electrode assembly 200 obtained by winding can have different shapes.

[0179] As shown in Figure 4, the first polymerization mechanism 31 is located downstream of the first feeding mechanism 11, the second feeding mechanism 12, and the third feeding mechanism 21. The first polymerization mechanism 31 is used to polymerize incoming materials comprising at least the first electrode sheet a, the first separator c, and the second electrode sheet b into a first composite sheet e. The winding mechanism 40 is located downstream of the first polymerization mechanism 31 and winds the incoming materials comprising at least the first composite sheet e to form the electrode assembly 200.

[0180] Among them, “the first feeding mechanism 11, the second feeding mechanism 12 and the third feeding mechanism 21 are arranged upstream of the first aggregation mechanism 31” can be understood as: at least the first feeding mechanism 11, the second feeding mechanism 12 and the third feeding mechanism 21 are arranged upstream of the first aggregation mechanism 31.

[0181] For example, the first feeding mechanism 11, the second feeding mechanism 12, and the third feeding mechanism 21 may be provided upstream of the first polymerization mechanism 31, while the fourth feeding mechanism 22 is not provided upstream of the first polymerization mechanism 31. Alternatively, for another example, the first feeding mechanism 11, the second feeding mechanism 12, the third feeding mechanism 21, and the fourth feeding mechanism 22 may be provided upstream of the first polymerization mechanism 31.

[0182] The first feeding mechanism 11 is arranged upstream of the first polymerization mechanism 31, so that the first electrode piece a released by the first feeding mechanism 11 can be conveyed to the first polymerization mechanism 31, so that the first electrode piece a can serve as the input material of the first polymerization mechanism 31. The second feeding mechanism 12 is arranged upstream of the first polymerization mechanism 31, so that the second electrode piece b released by the second feeding mechanism 12 can be conveyed to the first polymerization mechanism 31, so that the second electrode piece b can serve as the input material of the first polymerization mechanism 31. The third feeding mechanism 21 is arranged upstream of the first polymerization mechanism 31, so that the first diaphragm c released by the third feeding mechanism 21 can be conveyed to the first polymerization mechanism 31, so that the first diaphragm c can serve as the input material of the first polymerization mechanism 31. The fourth feeding mechanism 22 is arranged upstream of the first polymerization mechanism 31, so that the second diaphragm d released by the fourth feeding mechanism 22 can be conveyed to the first polymerization mechanism 31, so that the second diaphragm d can serve as the input material of the first polymerization mechanism 31.

[0183] For example, when the first feeding mechanism 11, the second feeding mechanism 12, and the third feeding mechanism 21 are provided upstream of the first polymerization mechanism 31, and the fourth feeding mechanism 22 is not provided upstream of the first polymerization mechanism 31, the input material of the first polymerization mechanism 31 includes the first electrode sheet a, the second electrode sheet b, and the first separator c. In this case, the first polymerization mechanism 31 can aggregate the first electrode sheet a, the first separator c, and the second electrode sheet b into a first composite sheet e. In this case, the first composite sheet e can be defined as a three-in-one composite sheet, in which the first separator c is stacked between the first electrode sheet a and the second electrode sheet b. In this case, the winding mechanism 40 is located downstream of the first polymerization mechanism 31 and can wind the first composite sheet e and the second separator d to form the electrode assembly 200.

[0184] For example, when the first feeding mechanism 11, the second feeding mechanism 12, the third feeding mechanism 21, and the fourth feeding mechanism 22 are disposed upstream of the first polymerization mechanism 31, the incoming materials of the first polymerization mechanism 31 include the first electrode sheet a, the second electrode sheet b, the first separator c, and the second separator d. In this case, the first polymerization mechanism 31 can aggregate the first electrode sheet a, the first separator c, the second electrode sheet b, and the second separator d into a first composite sheet e. In this case, the first composite sheet e can be defined as a four-in-one composite sheet, in which the first separator c is stacked between the first electrode sheet a and the second electrode sheet b, and the second electrode sheet b is stacked between the second separator d and the first separator c. In this case, the winding mechanism 40 is located downstream of the first polymerization mechanism 31 and can wind the first composite sheet e to form the electrode assembly 200.

[0185] Of course, the present application is not limited to this. For example, in other embodiments of the present application, in addition to the first feeding mechanism 11, the second feeding mechanism 12, the third feeding mechanism 21 and the fourth feeding mechanism 22 upstream of the first polymerization mechanism 31, other feeding mechanisms may also be provided. For example, when other material layers are stacked in the electrode assembly 200, the feeding mechanisms of the other material layers may also be selected to be provided upstream of the first polymerization mechanism 31.

[0186] In combination with Figures 4 and 30, the winding device 100 also includes a first detection device 70, which includes a first image acquisition device 71 and a processor 702. The first image acquisition device 71 is located between the first polymerization mechanism 31 and the winding mechanism 40, and is used to obtain an edge position image of at least one of the first pole piece a and the second pole piece b in the first composite piece e. The processor 702 is used to determine the edge distance based on the edge position image and determine whether the edge distance meets the threshold.

[0187] Exemplarily, the processor 702 can be communicatively connected to the first image acquisition device 71, so that the processor 702 can determine the edge distance based on the edge position image of at least one pole piece obtained by the first image acquisition device 71, and determine whether the edge distance meets the threshold by determining the edge distance.

[0188] Among them, “edge position image”, “edge distance” and “threshold” have multiple optional embodiments and can be specifically set according to the content to be judged.

[0189] For example, when it is necessary to judge the OH information in the width direction of the first composite sheet e, the "edge position image" is the "width side edge position image" at at least one side edge in the width direction of the first composite sheet e; the "edge distance" is the width edge distance between at least one pole piece in the first composite sheet e and at least one remaining material layer in the first composite sheet e; the "threshold" is the threshold of the width edge distance between at least one pole piece in the first composite sheet e and at least one remaining material layer in the first composite sheet e.

[0190] For example, when it is necessary to judge the OH information in the length direction of the first composite sheet e, the "edge position image" is the "length end edge position image" at at least one end edge in the length direction of the first composite sheet e; the "edge distance" is the head edge distance and / or tail edge distance of the two pole pieces in the first composite sheet e; the "threshold" is the threshold of the head edge distance and / or the threshold of the tail edge distance of the two pole pieces in the first composite sheet e.

[0191] In addition, the size and judgment of the threshold can be set according to actual conditions. For example, it can be judged whether the determined edge distance is greater than the threshold. For another example, it can be judged whether the determined edge distance is less than the threshold. For another example, it can be judged whether the determined edge distance is less than the maximum threshold and greater than the minimum threshold, that is, whether it falls within the threshold range.

[0192] In addition, in addition to obtaining the edge position image of at least one of the first pole piece a and the second pole piece b in the first composite sheet e, the first image acquisition device 71 can also obtain the edge position images of other material layers of the first composite sheet e as needed, thereby determining the required edge distance.

[0193] It is worth noting that "the first image acquisition device 71 is located between the first polymerization mechanism 31 and the winding mechanism 40" is not a restriction on the spatial position (that is, in space, the relative positions of the first image acquisition device 71, the first polymerization mechanism 31, and the winding mechanism 40 are not limited), but a restriction on the order of the workstations, that is, the first composite sheet e formed by the polymerization of the first polymerization mechanism 31 can first be inspected by the first image acquisition device 71 before entering the winding mechanism 40.

[0194] In the related art, in the process of producing electrode assemblies using winding equipment, the cathode electrode sheet, the anode electrode sheet and the diaphragm are fed into the winding mechanism separately, and a detector is set at the winding mechanism to obtain the offset between each layer. However, this method is prone to OH (overhang) leakage problems, such as OH between the cathode and anode electrode sheets, and OH between the diaphragm and the electrode sheet. Specifically, the detector performs OH detection before the electrode sheet is about to enter the winding mechanism. If the angle of the electrode sheet relative to the winding mechanism (i.e., the winding angle) deviates from the set angle, then after the electrode sheet enters the winding mechanism, the OH value of the product wound on the winding mechanism has changed relative to the previous detection result, and once the head of the electrode sheet enters the winding mechanism, it will be blocked by the winding mechanism, and the head of the electrode sheet can no longer be detected. There is a detection blind spot, so it is no longer possible to judge the OH after entering the winding mechanism. There is an OH leakage problem, which easily leads to the outflow of defective products.

[0195] In the embodiment of the present application, a first polymerization mechanism 31 is provided, and the polymerization of the first electrode a, the second electrode b and at least one diaphragm is completed in advance before entering the winding mechanism 40 to obtain the first composite sheet e, and a first detection device 70 is provided to detect the first composite sheet e before the first composite sheet e enters the winding mechanism 40, so that the quality of the first composite sheet e can be obtained, so that the first composite sheet e that has passed the detection continues to be conveyed to the winding mechanism 40. Because the relative positions between the positive and negative electrodes and between the electrode sheets and the diaphragms in the first composite sheet e after polymerization are relatively stable, displacement, misalignment, etc. are not prone to occur. Therefore, after the first composite sheet e that has passed the detection is wound by the winding mechanism 40, the OH value related to the electrode sheet still maintains a qualified state, thereby improving the problem of winding and outflow of unqualified products. Moreover, since the first composite sheet e is inspected before being put into the winding mechanism 40, the first image acquisition device 71 will not be blocked by the winding mechanism 40, and the head of the first composite sheet e will not be blocked by the winding mechanism 40 to form a detection blind spot. The first composite sheet e can be fully inspected, which is beneficial to improving the OH missed killing problem.

[0196] In some embodiments of the present application, the detection device in the winding device 100 may only include the first detection device 70; in some other embodiments of the present application, the detection device in the winding device 100 may not only include the first detection device 70, for example, it may also simultaneously include any one of the second detection device, the third detection device, the fifth detection device, the sixth detection device, the seventh detection device, the eighth detection device, the ninth detection device, and the tenth detection device described later.

[0197] For example, any other detection device other than the first detection device 70 (such as the second to tenth detection devices) may include their own image acquisition device and their own processor, and each image acquisition device is communicatively connected to its corresponding processor, thereby simplifying the communication connection wiring. Any other detection device other than the first detection device 70 (such as the second to tenth detection devices) may also include only their own image acquisition device without their own processor. In this case, each image acquisition device may be communicatively connected to the processor 702 of the first detection device 70, and the processor 702 of the first detection device 70 serves as a shared processor, thereby simplifying the equipment and reducing costs.

[0198] In the embodiment of the present application, the object of the edge position image acquired by the first image acquisition device 71 can be specifically set according to the content to be judged.

[0199] For example, in some embodiments, the objects of the edge position image acquired by the first image acquisition device 71 may include: the first pole piece a and the first diaphragm c. Specifically, the first image acquisition device 71 is used to acquire the edge position images of the first pole piece a and the first diaphragm c in the first composite piece e, and the edge distance includes the edge distance between the first pole piece a and the first diaphragm c.

[0200] For example, when determining the OH information of the first electrode piece a and the first diaphragm c in the width direction, the "edge position image" is the edge position image of the first electrode piece a and the first diaphragm c on the same side (one side or both sides) of the first composite sheet e in the width direction; the "edge distance" is the edge distance between the first electrode piece a and the first diaphragm c on the same side in the width direction of the first composite sheet e; and the "threshold" is the threshold value of the edge distance between the first electrode piece a and the first diaphragm c on the same side in the width direction of the first composite sheet e. This allows determining whether the edge distance of the first diaphragm c beyond the first electrode piece a on one side or both sides of the first composite sheet e in the width direction meets the corresponding threshold requirements.

[0201] For example, when determining the OH information of the first electrode piece a and the first diaphragm c along the length direction, the "edge position image" is the edge position image of the first electrode piece a and the first diaphragm c at the same end (head, tail, or both ends) along the length direction of the first composite piece e; the "edge distance" is the edge distance between the first electrode piece a and the first diaphragm c at the same end along the length direction of the first composite piece e; and the "threshold" is the threshold value of the edge distance between the first electrode piece a and the first diaphragm c at the same end along the length direction of the first composite piece e. This allows determining the head and / or tail position of the first composite piece e along the length direction, and whether the edge distance of the first diaphragm c beyond the first electrode piece a meets the corresponding threshold requirements.

[0202] For example, in some embodiments, the objects of the edge position image acquired by the first image acquisition device 71 may include: the second pole piece b and the first diaphragm c. Specifically, the first image acquisition device 71 is used to acquire the edge position image of the second pole piece b and the first diaphragm c in the first composite piece e, and the edge distance includes the edge distance between the second pole piece b and the first diaphragm c.

[0203] For example, when determining the OH information of the second electrode piece b and the first diaphragm c in the width direction, the "edge position image" is the edge position image of the second electrode piece b and the first diaphragm c on the same side (one or both sides) of the first composite sheet e in the width direction; the "edge distance" is the edge distance between the second electrode piece b and the first diaphragm c on the same side in the width direction of the first composite sheet e; and the "threshold" is the threshold value of the edge distance between the second electrode piece b and the first diaphragm c on the same side in the width direction of the first composite sheet e. This allows determining whether the edge distance of the first diaphragm c beyond the second electrode piece b on one or both sides of the first composite sheet e in the width direction meets the corresponding threshold requirements.

[0204] For example, when determining the OH information of the second electrode piece b and the first diaphragm c along the length direction, the "edge position image" is the edge position image of the second electrode piece b and the first diaphragm c at the same end (head, tail, or both ends) along the length direction of the first composite piece e; the "edge distance" is the edge distance between the second electrode piece b and the first diaphragm c along the same end of the length direction of the first composite piece e; and the "threshold" is the threshold value of the edge distance between the second electrode piece b and the first diaphragm c along the same end of the length direction of the first composite piece e. This allows determining the head and / or tail position of the first composite piece e along the length direction, and whether the edge distance of the first diaphragm c beyond the second electrode piece b meets the corresponding threshold requirements.

[0205] Exemplarily, the first image acquisition device 71 can be used to detect the relative position of the first diaphragm c and the electrode (the second electrode b and / or the first electrode a) in the first composite sheet e, such as determining whether the first diaphragm c can achieve insulation between the second electrode b and the first electrode a, the OH defect of the first diaphragm c wrapping the electrode along the width direction (that is, the size of the edge of the first diaphragm c exceeding the edge of the electrode in the width direction of the electrode does not meet the required size range), etc.

[0206] For example, in some embodiments, the objects for which the first image acquisition device 71 acquires edge position images may include: the first pole piece a and the second pole piece b. Specifically, the first image acquisition device 71 is used to acquire edge position images of the first pole piece a and the second pole piece b in the first composite piece e, and the edge distance includes the edge distance between the first pole piece a and the second pole piece b. Alternatively, in some embodiments, the objects for which the first image acquisition device 71 acquires edge position images may include: the first pole piece a, the first diaphragm c, and the second pole piece b. Specifically, the first image acquisition device 71 is used to acquire edge position images of the first pole piece a, the first diaphragm c, and the second pole piece b in the first composite piece e, and the edge distance includes the edge distance between the first pole piece a and the second pole piece b.

[0207] Among them, there are multiple optional embodiments for determining the "edge distance" between the first pole piece a and the second pole piece b. For example, a direct method can be used, that is, directly detecting the edge position of the first pole piece a and the edge position of the second pole piece b, and directly making a difference between the two to determine the edge distance between the first pole piece a and the second pole piece b. For example, in order to facilitate detection, an X-ray camera can be used to directly capture the edges of the first pole piece a and the second pole piece b; or, for example, an indirect method can also be used, that is, on the one hand, the edge distance OH1 between the first pole piece a and the first diaphragm c can be determined based on the edge position of the first pole piece a and the edge position of the first diaphragm c, and on the other hand, the edge distance OH2 between the second pole piece b and the first diaphragm c can be determined based on the edge position of the second pole piece b and the edge position of the first diaphragm c. The difference between the edge distance OH1 and the edge distance OH2 can be calculated to determine the edge distance between the first pole piece a and the second pole piece b.

[0208] For example, when determining the OH information of the second electrode piece b and the first electrode piece a in the width direction, the "edge position image" is the edge position image of the second electrode piece b and the first electrode piece a on the same side (one side or both sides) of the first composite piece e in the width direction; the "edge distance" is the edge distance of the second electrode piece b and the first electrode piece a on the same side in the width direction of the first composite piece e; and the "threshold" is the threshold value of the edge distance of the second electrode piece b and the first electrode piece a on the same side in the width direction of the first composite piece e. Thus, it is possible to determine whether the position of the first composite piece e in the width direction on one side or both sides, and whether the edge distance between the first electrode piece a and the second electrode piece b meets the corresponding threshold requirements.

[0209] For example, when determining the OH information of the lengthwise direction of the second electrode piece b and the first electrode piece a, the "edge position image" is the edge position image of the second electrode piece b and the first electrode piece a at the same end (head, tail, or both ends) of the lengthwise direction of the first composite piece e; the "edge distance" is the edge distance of the second electrode piece b and the first electrode piece a at the same end of the lengthwise direction of the first composite piece e; and the "threshold" is the threshold value of the edge distance of the second electrode piece b and the first electrode piece a at the same end of the lengthwise direction of the first composite piece e. Thus, it is possible to determine the head and / or tail position of the first composite piece e in the lengthwise direction, and whether the edge distance between the first electrode piece a and the second electrode piece b meets the corresponding threshold requirements.

[0210] For example, the first image acquisition device 71 can be used to determine the OH of the anode electrode sheet in the width direction of the cathode electrode sheet (i.e., the extent to which the edges of the active material region of the anode electrode sheet extend beyond the edges of the active material region of the cathode electrode sheet in the width direction). In this way, by improving the OH leakage problem, the distance between the width of the anode electrode sheet and the edges of the cathode electrode sheet in the subsequently wound electrode assembly 200 meets the requirements, which helps to solve the lithium plating problem.

[0211] Exemplarily, the first image acquisition device 71 can be used to determine the OH of the anode electrode sheet in the length direction and the width direction respectively. In this way, in the first composite sheet e formed, the length and width of the anode electrode sheet are both larger than the cathode electrode sheet, so that the anode electrode sheet can completely cover the cathode electrode sheet.

[0212] Furthermore, when the first composite sheet e includes a second diaphragm d, the object for which the first image acquisition device 71 acquires the edge position image may also include the second diaphragm d. For example, based on the edge position image of the second diaphragm d and the edge position image of the second electrode piece b, it can be determined whether the distance between the edge of the second diaphragm d and the edge of the second electrode piece b meets a corresponding threshold requirement. In another example, based on the edge position image of the second diaphragm d and the edge position image of the first diaphragm c, it can be determined whether the edge distance between the second diaphragm d and the first diaphragm c meets a corresponding threshold requirement (for example, when edge sealing of two diaphragms is required, determining whether the edge sealing requirement is met).

[0213] In the embodiment of the present application, the specific type of the first image acquisition device 71 is not limited, and may include, for example, a CCD camera, an X-ray camera, etc. For example, the processor 702 can convert the image information of the first composite sheet e acquired by the first image acquisition device 71 into a digital signal, and then perform corresponding calculations and judgments.

[0214] For a clearer explanation, some optional embodiments of the first image acquisition device 71 are introduced below in combination with some application scenarios, but the optional embodiments of the first image acquisition device 71 are not limited to the following.

[0215] In some embodiments, the first image acquisition device 71 is used to obtain the width side edge position image of the first composite sheet e in the width direction, and the processor 702 is used to determine the edge distance on one side and / or both sides of the width based on the width side edge position image, and determine whether the edge distance meets the corresponding threshold.

[0216] At this time, in “the first image acquisition device 71 is used to obtain the edge position image of at least one electrode piece among the first electrode piece a and the second electrode piece b in the first composite sheet e, and the processor 702 is used to determine the edge distance based on the edge position image of at least one electrode piece obtained by the first image acquisition device 71, and judge whether the edge distance meets the threshold value”: “edge position image” is the “width side edge position image” at at least one side edge in the width direction of the first composite sheet e; “edge distance” is the width edge distance between at least one electrode piece in the first composite sheet e and at least one remaining material layer in the first composite sheet e; “threshold value” is the threshold value of the width edge distance between at least one electrode piece in the first composite sheet e and at least one remaining material layer in the first composite sheet e.

[0217] Thus, the OH situation of the first composite sheet e in the width direction can be judged. For example, when the detection objects are the first electrode a and the first diaphragm c, it can be judged whether the position of the first composite sheet e on one side or both sides in the width direction, and the edge distance of the first diaphragm c beyond the first electrode a meet the corresponding threshold requirements. For example, when the detection objects are the second electrode b and the first diaphragm c, it can be judged whether the position of the first composite sheet e on one side or both sides in the width direction, and the edge distance of the first diaphragm c beyond the second electrode b meet the corresponding threshold requirements. For example, when the detection objects are the second electrode b and the first electrode a, it can be judged whether the position of the first composite sheet e on one side or both sides in the width direction, and the edge distance of the first electrode a and the second electrode b meet the corresponding threshold requirements.

[0218] In some embodiments, when the first image acquisition device 71 is used to obtain the width side edge position image of the first composite sheet e in the width direction, in combination with Figures 6 and 7, the first image acquisition device 71 may include a first acquisition unit 711, and the first acquisition unit 711 includes two groups of CCD cameras. The two groups of CCD cameras are arranged on both sides of the first composite sheet e along the thickness direction of the first composite sheet e, and the two groups of CCD cameras are respectively used to obtain the width side edge position image of the first composite sheet e in the width direction.

[0219] Thus, images can be collected from both sides of the first composite sheet e in the thickness direction, so that relatively accurate and clear image information can be obtained regardless of whether image information of the first electrode sheet a or the second electrode sheet b needs to be collected.

[0220] Exemplarily, in combination with Figures 6 and 7, each group of CCD cameras in the first acquisition unit 711 includes two CCD cameras, and the two CCD cameras in the same group are arranged at intervals along the width direction of the first composite sheet e. The two CCD cameras in the same group are respectively used to obtain width side edge position images of the edge positions on both sides in the width direction of the first composite sheet e.

[0221] Thus, a single first collecting unit 711 can collect image information of both sides of the first composite sheet e in the width direction at the same time, thereby realizing OH determination on either side and both sides of the width.

[0222] In some embodiments, when the first image acquisition device 71 is used to obtain the width side edge position image of the first composite sheet e in the width direction, combined with Figure 31, the first image acquisition device 71 may include a second acquisition unit 712, and the second acquisition unit 712 includes an X-ray camera, which is used to obtain the width side edge position image of the first composite sheet e in the width direction.

[0223] Since the X-ray camera can penetrate and take pictures, it only needs to be set on one side of the first composite sheet e in the thickness direction, and does not need to be set on both sides of the first composite sheet e in the thickness direction, thereby saving space and simplifying the setting.

[0224] In some embodiments, the first image acquisition device 71 is used to acquire a length end position image of the first electrode piece a and the second electrode piece b in the length direction of the first composite piece e, and the processor 702 is used to determine the edge distance between the first electrode piece a and the second electrode piece b at the beginning and / or the end of the length based on the length end edge position image of the first electrode piece a and the second electrode piece b, and to determine whether the edge distance meets a corresponding threshold. Alternatively, the first image acquisition device 71 can also be used to acquire a length end position image of the first electrode piece a, the first diaphragm c, and the second electrode piece b in the length direction of the first composite piece e, and the processor 702 is used to determine the edge distance between the first electrode piece a and the second electrode piece b at the beginning and / or the end of the length based on the length end edge position image of the first electrode piece a, the first diaphragm c, and the second electrode piece b, and to determine whether the edge distance meets a corresponding threshold.

[0225] For example, the first image acquisition device 71 is used to obtain the head edge position image of the first pole piece a and the second pole piece b in the length direction of the first composite piece e, and the processor 702 is used to determine the head edge distance between the first pole piece a and the second pole piece b based on the head edge position image of the first pole piece a and the second pole piece b, and determine whether the head edge distance meets the corresponding threshold.

[0226] For another example, the first image acquisition device 71 is used to obtain the tail edge position image of the first pole piece a and the second pole piece b in the length direction of the first composite piece e, and the processor 702 is used to determine the tail edge distance of the first pole piece a and the second pole piece b based on the tail edge position image of the first pole piece a and the second pole piece b, and to determine whether the tail edge distance meets the corresponding threshold.

[0227] This allows the determination of the OH condition of the first composite sheet e along its length. For example, the longitudinal position of the first composite sheet e and / or its tail, as well as the edge distance between the first pole piece a and the second pole piece b, can be determined to meet the corresponding threshold requirements. In related art, because the head of the first composite sheet e is difficult to detect after entering the winding mechanism, performing this inspection before entering the winding needle can mitigate the problem of missed OH.

[0228] The pole pieces (first pole piece a, second pole piece b) of the first composite piece e have a head and tail at their ends along their length. At the cutout, the pole pieces are prone to swinging. This deviation of the head of the pole piece is called "head swing," and the deviation of the tail of the pole piece is called "tail swing." Based on the above description, the first detection device 70 can be used to determine whether the first composite piece e has a "head swing problem" and / or a "tail swing problem."

[0229] In some embodiments, when the first image acquisition device 71 is used to obtain the length end position images of the first pole piece a and the second pole piece b in the length direction of the first composite piece e, combined with Figure 32, the first image acquisition device 71 includes a third acquisition unit 713, and the third acquisition unit 713 has two groups of CCD cameras. The two groups of CCD cameras are arranged on both sides of the first composite piece e along the thickness direction of the first composite piece e, and the two groups of CCD cameras are respectively used to obtain the head and tail edge position images of the first pole piece a and the second pole piece b in the length direction of the first composite piece e.

[0230] Therefore, images can be collected from both sides of the thickness direction of the first composite sheet e, so that the collected image information of the first pole piece a and the second pole piece b is relatively accurate and clear, which is conducive to more accurate judgment of the OH problem at the head and / or tail of the length of the first pole piece a and the second pole piece b.

[0231] In some embodiments, when the first image acquisition device 71 is used to obtain the length end position images of the first pole piece a and the second pole piece b in the length direction of the first composite piece e, combined with Figure 33, the first image acquisition device 71 includes a fourth acquisition unit 714, and the fourth acquisition unit 714 includes an X-ray camera, which is used to obtain the head and tail edge position images of the first pole piece a and the second pole piece b in the length direction of the first composite piece e.

[0232] Since the X-ray camera can penetrate and take pictures, it only needs to be set on one side of the first composite sheet e in the thickness direction, and does not need to be set on both sides of the first composite sheet e in the thickness direction, thereby saving space and simplifying the setting.

[0233] In some embodiments of the present application, the first collecting part 711 and the third collecting part 713 may be the same or separate. In the case of separate locations, the first collecting part 711 and the third collecting part 713 may be separately arranged.

[0234] In some embodiments of the present application, the second collecting unit 712 and the fourth collecting unit 714 may be the same or separate. In the case of separate units, the second collecting unit 712 and the fourth collecting unit 714 may be arranged at separate locations.

[0235] In some embodiments, with reference to FIG34 , the winding apparatus 100 further includes a rejection mechanism 99 located between the first detection device 70 and the winding mechanism 40. The rejection mechanism 99 is configured to reject first composite sheets e that do not meet the threshold value based on a signal from the processor 702 indicating that the edge distance does not meet the threshold value. Exemplarily, the rejection mechanism 99 is communicatively coupled to the processor 702 and is capable of receiving the signal from the processor 702 indicating that the edge distance does not meet the threshold value and, based on the signal, rejecting first composite sheets e that do not meet the threshold value.

[0236] For example, when the determined edge distance should be greater than a threshold but is less than the threshold, it does not meet the threshold requirement and can be eliminated. For another example, when the determined edge distance should be less than a threshold but is greater than the threshold, it does not meet the threshold requirement and can be eliminated. For another example, when the determined edge distance should be less than a maximum threshold and greater than a minimum threshold, that is, it should fall within the threshold range but is outside the threshold range, it does not meet the threshold requirement and can be eliminated. The threshold can be set according to actual conditions.

[0237] In the above technical solution, after the processor 702 determines that the threshold is not met, it can remove the first composite sheet e that does not meet the requirements and prevent it from being wound onto the winding mechanism 40. This can prevent the outflow of defective products, control the quality of the wound product, and avoid the generation of winding waste and unnecessary waste. Related technologies, on the other hand, use alarms or marking, but do not remove the product before winding, which can easily result in waste or defective products.

[0238] In addition, exemplarily, the first image acquisition device 71 is located after the first polymerization mechanism 31 and before the winding mechanism 40, and can also be used to detect the status of the electrode sheets (the second electrode sheet b and / or the first electrode sheet a) in the first composite sheet e, such as whether the electrode sheets have folded corners, whether the electrode sheets are damaged, the width of the active material layer of the electrode sheets, and known defective electrode sheets (such as defective products with yellow labels, etc.).

[0239] In addition, illustratively, the first image acquisition device 71 is located after the first polymerization mechanism 31 and before the winding mechanism 40, and can also be used to detect the state of the first diaphragm c in the first composite sheet e, such as diaphragm wrinkling, diaphragm folding, and diaphragm damage.

[0240] In the related art, because the lamination of the electrode and the diaphragm is usually carried out at the winding needle, the electrode and the diaphragm entering the winding needle are not easily detected by the detection equipment. In addition to being prone to OH leakage (overhang, the excess part, which can be the OH between the cathode and anode electrodes, or the OH between the diaphragm and the electrode), it is also prone to leakage of defects such as the electrode head corner crushing. In the embodiment of the application, the first image acquisition device 71 is set upstream of the winding mechanism 40, so that the first detection device 71 can more comprehensively detect the first composite sheet e, reducing the area of ​​blind spots or undetectable parts, and improving the problem of leakage of defects such as the electrode head corner crushing. In addition, after the first polymerization mechanism 31 polymerizes the first composite sheet e, the positions between the anode and cathode electrodes, and between the electrode and the diaphragm are relatively fixed and not easily shifted. The structure of the first composite sheet e that passes the first detection device 71 is not easily changed, thereby improving the pass rate of the electrode assembly 200 subsequently wound.

[0241] In the related art, the winding equipment winds the first electrode piece, the first diaphragm, the second electrode piece and the second diaphragm at the winding needle, and uses a CCD image acquisition device to detect them. The CCD image acquisition device takes pictures toward the winding needle. Due to the angle limitation, the head of the electrode piece is difficult to be photographed by the CCD image acquisition device when winding in, and the tail of the electrode assembly is also difficult to be photographed when unwinding. There are blind spots in the detection, and it is difficult to detect the head and tail of the electrode piece, as well as the damage of the head and tail. In the embodiment of the application, a first polymerization mechanism 31 is provided to complete the polymerization of the first electrode a, the second electrode b and the first diaphragm c before the electrode is wound, and a first image acquisition device 71 is provided to detect the first composite sheet e in all directions before the first composite sheet e enters the winding mechanism 40, so as to promptly detect possible defects in the electrode and the diaphragm, such as OH leakage (OH between the cathode and anode electrodes, or OH between the diaphragm and the electrode), wrinkling of the diaphragm head, crushing and damage of the electrode, head and tail swinging and other defects, thereby reducing the detection blind spots and being able to promptly eliminate unqualified products, thereby helping to improve the quality of the electrode assembly 200.

[0242] In the related art, during the manufacturing process of the battery cell of the battery, a winding machine is used to wind two pole pieces on different material lines together. The two pole pieces will be separately conveyed to the winding needle of the winding mechanism. The two pole pieces need to maintain a certain relative position, otherwise lithium deposition is likely to occur. Specifically, there is an offset between the two pole pieces in the length or width direction. Lithium ions are not transferred from one pole piece to the other, but are deposited in the area outside the pole piece, thereby generating lithium crystals, causing the electrode assembly formed by the pole piece to be punctured, cut, and other defects, which in turn causes safety risks to the battery cell. In order to ensure the relative position of the two pole pieces, to avoid punctures, cuts, and other defects in the electrode assembly formed after winding, and to avoid these adverse effects on subsequent processes (such as welding, etc.), a detector can be used to detect the pole pieces during or after winding, so as to confirm that the two pole pieces in the detection area are in the correct position. However, when the detector detects the two pole pieces during the winding process or the two pole pieces after winding, there is a blind spot in the field of view, and there is a problem of missed detection. Moreover, the two electrode sheets have free ends, which is specifically manifested in that the two electrode sheets are not offset before entering the winding needle, but are offset after entering the winding needle. Therefore, at the beginning of winding, the detection of the relative position between the two electrode sheets is inaccurate. In the embodiment of the application, the first aggregation mechanism 31 in the winding device 100 aggregates the second electrode sheet b, the first electrode sheet a, and the diaphragm before entering the winding needle 42 to form a flattened first composite sheet e. Since the first composite sheet e is in a flattened state and has not been wound, the relative position of the second electrode sheet b and the first electrode sheet a is relatively stable, allowing the first image acquisition device 71 to accurately and easily detect the relative position between the second electrode sheet b and the first electrode sheet a. There is no blind spot in the shooting, and the head, middle, and tail of the entire first composite sheet e can be captured, so that the relative position of the second electrode sheet b and the first electrode sheet a is correct, and there is no OH leakage at the head and tail, which helps to improve the quality of the electrode assembly 200.

[0243] Furthermore, in the embodiments of the application, by providing a first aggregation mechanism 31 and a winding mechanism 40, at least the second electrode sheet b, the first separator c, and the first electrode sheet a are sequentially stacked and aggregated by the first aggregation mechanism 31 to form a first composite sheet e, which is then wound by the winding mechanism 40 to form the electrode assembly 200. In this way, the aggregation operation of at least the second electrode sheet b, the first separator c, and the first electrode sheet a is provided separately from the winding operation of the winding mechanism 40, eliminating the need to centrally aggregate the second electrode sheet b, the first separator c, and the first electrode sheet a at the winding needle 42 of the winding mechanism 40. This allows for a larger space between at least the first feeding mechanism 11, the second feeding mechanism 12, and the third feeding mechanism 21 and the winding mechanism 40, thereby improving the layout rationality of the winding apparatus 100 and facilitating the layout of various functional devices and mechanisms, such as the layout of the aforementioned first image acquisition device 71, thereby contributing to improved quality of the electrode assembly 200.

[0244] 4 , in some embodiments, the winding device 100 further includes a first cutting mechanism 61 for cutting the first electrode sheet a and a second cutting mechanism 62 for cutting the second electrode sheet b. For example, when a first aggregation mechanism 31 is provided upstream of the winding mechanism 40, both the first cutting mechanism 61 and the second cutting mechanism 62 can be provided upstream of the first aggregation mechanism 31. For example, the first cutting mechanism 61 can be provided between the first feeding mechanism 11 and the first aggregation mechanism 31, and the second cutting mechanism 62 can be provided between the second feeding mechanism 12 and the first aggregation mechanism 31. Thus, both the first cutting mechanism 61 and the second cutting mechanism 62 can be provided spatially away from the winding mechanism 40, thereby resolving the adverse effects on the quality of the electrode assembly 200 caused by chips formed during cutting falling into the electrode assembly 200 being wound on the winding needle 42, thereby further improving the quality of the electrode assembly 200.

[0245] 4 , in some embodiments, the winding apparatus 100 further includes a third cutting mechanism 63 for cutting the separator. Since the first separator c and the second separator d are both supplied in continuous rolls, the third cutting mechanism 63 is required to cut the first separator c and the second separator d after they are assembled with the first electrode piece a and the second electrode piece b.

[0246] The number of third cutting mechanisms 63 is not limited, and can be one or two. For example, when there is only one third cutting mechanism 63, the third cutting mechanism 63 can simultaneously cut the first diaphragm c and the second diaphragm d. For another example, when there are at least two third cutting mechanisms 63, at least one third cutting mechanism 63 can be used to cut the first diaphragm c, and at least one third cutting mechanism 63 can be used to cut the second diaphragm d.

[0247] For example, when the first image acquisition device 71 is positioned between the first aggregation mechanism 31 and the winding mechanism 40, the specific location of the third cutting mechanism 63 can be flexibly set. For example, the first image acquisition device 71 can be positioned between the first aggregation mechanism 31 and the third cutting mechanism 63 (see Figures 4 and 5 ), or between the third cutting mechanism 63 and the winding mechanism 40.

[0248] In conjunction with Figure 4, in some embodiments, the fourth feeding mechanism 22 is arranged upstream of the first polymerization mechanism 31 so that the second diaphragm d is also polymerized in the first composite sheet e, that is, the first polymerization mechanism 31 is used to polymerize the incoming material including at least the first electrode piece a, the first diaphragm c, the second electrode piece b and the second diaphragm d into the first composite sheet e.

[0249] The fourth feeding mechanism 22 is disposed upstream of the first polymerization mechanism 31, so that the second diaphragm d released by the fourth feeding mechanism 22 can be conveyed to the first polymerization mechanism 31, so that the second diaphragm d can serve as the input material of the first polymerization mechanism 31. For example, the first polymerization mechanism 31 can aggregate the first electrode piece a, the first diaphragm c, the second electrode piece b, and the second diaphragm d into a first composite piece e, so that the first composite piece e is a four-in-one composite piece. In the four-in-one composite piece, the first diaphragm c is stacked between the first electrode piece a and the second electrode piece b, and the second diaphragm d is stacked on the side of the first electrode piece a or the second electrode piece b away from the first diaphragm c.

[0250] To simplify the description, the following explanation uses the example of the second electrode piece b stacked between the first diaphragm c and the second diaphragm d in the first composite sheet e. Of course, the first electrode piece a can also be stacked between the first diaphragm c and the second diaphragm d. For example, the first composite sheet e is stacked in the order of the first electrode piece a, the first diaphragm c, the second electrode piece b, and the second diaphragm d. The second electrode piece b is stacked between the first diaphragm c and the second diaphragm d, and the first diaphragm c is stacked between the first electrode piece a and the second electrode piece b. The first electrode piece a is the cathode electrode piece, and the second electrode piece b is the anode electrode piece.

[0251] The first electrode piece a, the second electrode piece b, the first diaphragm c, and the second diaphragm d are all sheet-like structures and have a thickness. For example, the second diaphragm d, the second electrode piece b, the first diaphragm c, and the first electrode piece a are stacked in sequence, which means that the second diaphragm d, the second electrode piece b, the first diaphragm c, and the first electrode piece a are stacked in sequence along the thickness direction of the electrode pieces, and in this case, the thickness direction of the second diaphragm d, the thickness direction of the second electrode piece b, the thickness direction of the first diaphragm c, and the thickness direction of the first electrode piece a are parallel.

[0252] In the first composite sheet e, the first diaphragm c is disposed between the second electrode sheet b and the first electrode sheet a to provide insulation between the second electrode sheet b and the first electrode sheet a. In the electrode assembly 200 formed by winding the first composite sheet e, the second diaphragm d is disposed between the second electrode sheet b and the first electrode sheet a to provide insulation between the second electrode sheet b and the first electrode sheet a.

[0253] Thus, when the fourth feeding mechanism 22 is arranged upstream of the first polymerization mechanism 31 so that the second diaphragm d is also polymerized in the first composite sheet e, the first composite sheet e detected by the first image acquisition device 71 includes at least the first electrode piece a, the first diaphragm c, the second electrode piece b and the second diaphragm d which are stacked, thereby facilitating a more comprehensive detection, for example, in addition to the above-mentioned detection of the relative position of the second electrode piece b and the first electrode piece a in the first composite sheet e, the detection of the relative position of the first diaphragm c and the electrode piece in the first composite sheet e, the detection of the electrode piece (the second electrode piece b and / or the first diaphragm d) in the first composite sheet e, In addition to detecting the status of an electrode piece a), detecting the status of the first diaphragm c in the first composite piece e, and detecting whether the first composite piece e has a head-shaking or tail-shaking problem, it can also be used to detect the relative position of the second diaphragm d and the electrode piece (the second electrode piece b and / or the first electrode piece a), and can also be used to detect the status of the second diaphragm d in the first composite piece e, and can also be used to detect the relative position of the first diaphragm c and the second diaphragm d, etc. There are more types of detectable information, which can more fully avoid the problem of missing defects, and timely eliminate unqualified products, thereby improving the quality of the electrode assembly 200.

[0254] Moreover, the first polymerization mechanism 31 can aggregate at least the first electrode piece a, the first diaphragm c, the second electrode piece b and the second diaphragm d to obtain a first composite piece e. Compared with the solution of aggregating these four at the winding needle 42, it can reduce the functional requirements of the winding needle 42, facilitate increasing the winding speed of the winding needle 42, and improve production efficiency; and it can complete the polymerization of the electrode piece and the diaphragm before winding, so as to reduce the displacement of the electrode piece and the diaphragm during the winding process, and improve the quality of the electrode assembly 200.

[0255] 4 and 5 , when the second diaphragm d is also polymerized in the first composite sheet e, the first polymerization mechanism 31 may be an edge sealing mechanism, which is used to seal and connect at least one of the two side edges of the first diaphragm c and the second diaphragm d in the width direction.

[0256] Among them, the edge sealing connection of the two diaphragm edges can be set only on the pole ear side in the width direction of the pole piece, or only on the slitting side in the width direction of the pole piece (i.e., the non-pole ear side), or simultaneously on both sides in the width direction of the pole piece (i.e., the pole ear side and the slitting side). Among them, the edge sealing of the two diaphragms on the pole ear side can be continuous edge sealing or intermittent edge sealing that avoids the pole ear (i.e., the pole ear area is not sealed), and the edge sealing of the two diaphragms on the slitting side can be continuous edge sealing or intermittent edge sealing. In addition, the selection and function of the "edge sealing mechanism" mentioned in any subsequent embodiment of this application can refer to this embodiment.

[0257] With reference to Figure 6 , for electrode assembly 200, the material conveying direction of the second electrode sheet b, first electrode sheet a, first separator c, and second separator d refers to the direction of material movement during the production process, i.e., the length direction of each material in electrode assembly 200. The thickness direction F1 of the second electrode sheet b, first electrode sheet a, first separator c, and second separator d refers to the direction of minimum material size, i.e., the direction in which the materials are stacked in electrode assembly 200. The width direction F2 of the second electrode sheet b, first electrode sheet a, first separator c, and second separator d refers to the direction perpendicular to the thickness direction F1 and the material conveying direction. During the winding process of electrode assembly 200, the winding axis is generally parallel to the width direction F2.

[0258] The width of the first diaphragm c is greater than the width of the second electrode piece b, and the width of the second diaphragm d is greater than the width of the second electrode piece b. The edge sealing mechanism is capable of sealing and connecting the portion of the first diaphragm c that extends beyond the edge of the second electrode piece b in the width direction F2 and the portion of the second diaphragm d that extends beyond the edge of the second electrode piece b in the width direction F2. For example, the connection between the first diaphragm c and the second diaphragm d can be achieved by heating, pressurizing, gluing, etc. Depending on actual needs, the edge sealing of the first diaphragm c and the second diaphragm d can extend continuously or intermittently along the material conveying direction, and this is within the scope of protection of this application.

[0259] For example, the portion of the second diaphragm d shown in Figure 6 that extends beyond the left edge of the second pole piece b is connected to the portion of the first diaphragm c that extends beyond the left edge of the second pole piece b to achieve left-side edge sealing; for example, the portion of the second diaphragm d shown in Figure 6 that extends beyond the right edge of the second pole piece b is connected to the portion of the first diaphragm c that extends beyond the right edge of the second pole piece b to achieve right-side edge sealing; the left-side edge sealing and the right-side edge sealing can be set at the same time, or only one of them can be set.

[0260] Therefore, the edge sealing mechanism can connect the edges of the first diaphragm c and the second diaphragm d together to achieve edge sealing. When the external force is removed, the first diaphragm c and the second diaphragm d will not separate, causing the second pole piece b to be exposed. During the winding process of the electrode assembly 200, the diaphragm is not easy to fold, and it is not easy to be disturbed by holes during the injection process. It effectively reduces the risk of overlapping the second pole piece b with the first pole piece a and overlapping the second pole piece b with the shell 3011 of the battery cell 301, and improves the lithium plating problem.

[0261] Exemplarily, in combination with Figure 5, the edge sealing mechanism may include two edge sealing rollers arranged opposite to each other, which can heat the edges on both sides of the first diaphragm c and the second diaphragm d and apply a predetermined pressure along the thickness direction F1 to achieve the edge sealing connection of the first diaphragm c and the second diaphragm d.

[0262] Exemplarily, in combination with Figure 4, the first aggregation mechanism 31 may include two rollers arranged relatively spaced apart, or may include one roller and a support arranged relatively spaced apart from the roller, or may include multiple rollers or other structures; the roller in the first aggregation mechanism 31 may be a rotatable structure, a fixed structure, or a floating structure; the roller in the first aggregation mechanism 31 may also be an active roller or a passive roller.

[0263] 5 to 7 , when the first aggregation mechanism 31 is an edge sealing mechanism, the first image acquisition device 71 can be used to detect the edge sealing state of the first composite sheet e.

[0264] The first image acquisition device 71 is positioned downstream of the edge sealing mechanism, allowing the first composite sheet e to be conveyed to the first image acquisition device 71 after edge sealing, so that the first image acquisition device 71 can detect the condition of the formed edge seal. For example, edge seal defects such as electrode sheet folding angles, wrinkles in the first and second diaphragms c and d, edge seal failure, edge seal misalignment, edge seal size, and grayscale differences can be detected. For example, the width and position of the edge seal in the width direction F2 of the first and second diaphragms c and d can be detected. Based on the detection results, the first and second diaphragms c and d and the edge sealing mechanism can be adjusted to ensure that the width of the formed edge seal is 0.5 mm to 1 mm, and the edge seal is generally located in the middle of the portion where the first and second diaphragms c and d extend beyond the edge of the second electrode sheet b. This improves the reliability of the edge seal, and the first and second diaphragms c and d can reliably limit and protect the second electrode sheet b. For example, as shown in FIG6 and FIG7, first image acquisition devices 71 are provided on both sides of the electrode assembly 200 in the thickness direction F1 to detect information such as the relative position of the second electrode piece b and the first electrode piece a.

[0265] The first image acquisition device 71 can adopt a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different image acquisition devices can be the same or different. For example, the first image acquisition device 71 may include a CCD. The CCD can obtain the optical image of the material to achieve detection. Furthermore, the CCD can also convert the optical image into a digital signal so as to analyze, process and store the optical image. For example, the first image acquisition device 71 may include an X-ray camera, and the X-ray camera can penetrate the first diaphragm c and the second diaphragm d to detect the position of the second pole piece b located in the inner layer. The X-ray camera has high resolution and can penetrate objects for detection, thereby improving the detection accuracy.

[0266] Of course, the present application is not limited to this. In other embodiments of the present application, the first polymerization mechanism 31 is not limited to being an edge sealing mechanism. For example, the first polymerization mechanism 31 can also be a mechanism for connecting and fixing at least two layers in the first composite sheet e, or the first polymerization mechanism 31 can also be a mechanism for making the layers in the first composite sheet e only stacked together without being connected.

[0267] 4 and 5 , in some embodiments, when the fourth feeding mechanism 22 is positioned upstream of the first aggregation mechanism 31, the first electrode sheet a and the first separator c can be aggregated first. For example, the winding apparatus 100 may further include a second aggregation mechanism 32, which is positioned upstream of the first aggregation mechanism 31 and downstream of the first feeding mechanism 11 and the third feeding mechanism 21. The second aggregation mechanism 32 is configured to aggregate the first electrode sheet a and the first separator c into a second composite sheet f.

[0268] In this way, the first electrode a on the first feeding mechanism 11 and the first diaphragm c on the third feeding mechanism 21 can both be conveyed to the second polymerization mechanism 32 and polymerized by the second polymerization mechanism 32. The second polymerization mechanism 32 is used to polymerize the first electrode a and the first diaphragm c; the polymerization of the first electrode a and the first diaphragm c refers to the first electrode a and the first diaphragm c being stacked into a second composite sheet f. The first electrode a and the first diaphragm c in the second composite sheet f can be in contact but not connected, or can be in contact and connected, that is, the first electrode a and the first diaphragm c in the second composite sheet f are in a connected or non-connected state.

[0269] Therefore, by setting the second polymerization mechanism 32 upstream of the first polymerization mechanism 31, the first electrode a and the first diaphragm c can be polymerized preferentially. The number of material layers polymerized here is relatively small, and the polymerization quality can be better controlled. The relative position of the first electrode a and the first diaphragm c, as well as the respective states of the first electrode a and the first diaphragm c can be better guaranteed, thereby improving product quality.

[0270] The type of the second polymerization mechanism 32 is not limited and can be specifically configured according to whether the first electrode a and the first diaphragm c in the second composite sheet f need to be connected.

[0271] For example, referring to Figures 4 and 5 , the second polymerization mechanism 32 is a composite mechanism and is used to securely connect the first electrode plate a and the first diaphragm c in the second composite plate f. This reduces the displacement of the first electrode plate a relative to the first diaphragm c during winding and use, which helps improve the accuracy of the relative positions between the various materials, thereby enhancing product quality. The method of secure connection is not limited, and for example, cold pressing, hot pressing, gluing, or the like can be used. Furthermore, the location of the secure connection is not limited and can be the entire surface or a portion, such as a portion in the center or a portion at the edge.

[0272] For example, with reference to FIG4 , the second polymerization mechanism 32 can press the first electrode piece a onto the first diaphragm c by pressure, or can adhere the first electrode piece a to the first diaphragm c by applying glue or other means. For example, the second polymerization mechanism 32 can include two rollers spaced apart from each other, or a single roller and a support spaced apart from the roller, or multiple rollers or other structures. The roller in the second polymerization mechanism 32 can be rotatable, fixed, or floating. The roller in the second polymerization mechanism 32 can also be an active roller or a passive roller.

[0273] For example, with reference to FIG5 , the second polymerization mechanism 32 can composite the first electrode piece a and the first diaphragm c, that is, connect the first electrode piece a and the first diaphragm c together. For example, the connection can be achieved through heating, pressurization, etc., thereby reducing the displacement of the first electrode piece a relative to the first diaphragm c during winding and use, thereby improving the accuracy of the relative position between the materials. For example, the composite mechanism can include two composite rollers arranged opposite each other, which can heat the first electrode piece a and the first diaphragm c and apply a predetermined pressure along the thickness direction F1 to bond the first electrode piece a and the first diaphragm c together, thereby achieving a composite connection between the first electrode piece a and the first diaphragm c.

[0274] Of course, the present application is not limited to this. In other embodiments of the present application, the second polymerization mechanism 32 is not limited to being a composite mechanism. For example, the second polymerization mechanism 32 can also be a mechanism for stacking the first electrode a and the first diaphragm c in the second composite sheet f together without connecting them.

[0275] 4 , in some embodiments, when the winding apparatus 100 includes the second aggregating mechanism 32, the winding apparatus 100 may further include a second detection device, comprising a second image acquisition device 72. The second image acquisition device 72 is located between the second aggregating mechanism 32 and the first aggregating mechanism 31 and is configured to detect the second composite sheet f. The second image acquisition device 72 may be communicatively connected to the processor 702, or the second detection device may comprise a separate processor that is communicatively connected to the second image acquisition device 72.

[0276] It is worth noting that "the second image acquisition device 72 is located between the second aggregation mechanism 32 and the first aggregation mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the second image acquisition device 72, the first aggregation mechanism 31, and the second aggregation mechanism 32 are not limited), but a restriction on the order of the workstations, that is, the second composite sheet f formed by the aggregation of the second aggregation mechanism 32 can first be inspected by the second image acquisition device 72 before entering the first aggregation mechanism 31.

[0277] 4 , a second image acquisition device 72 is disposed between the second aggregating mechanism 32 and the first aggregating mechanism 31 and is used to inspect the second composite sheet f. Exemplarily, the second image acquisition device 72 may include a camera, a machine vision detection device, or other structures. Exemplarily, the second image acquisition device 72 may also include other components, such as a control device. The second image acquisition device 72 can capture image information (e.g., position, color, shape, etc.) of the second composite sheet f and convert this image information into a digital signal, which is then transmitted to the control device, allowing the control device to determine whether the second composite sheet f meets requirements according to a preset program.

[0278] 4 , by disposing a second image acquisition device 72 between the second polymerization mechanism 32 and the first polymerization mechanism 31, the second image acquisition device 72 can be used to detect the second composite sheet f obtained by polymerization by the second polymerization mechanism 32 and not entering the first polymerization mechanism 31, so as to promptly discover defects and abnormalities in the second composite sheet f, thereby facilitating timely response when problems occur in the second composite sheet f, thereby reducing the negative impact on subsequent processes and improving product quality.

[0279] 5 , illustratively, the second image acquisition device 72 is used to detect the relative position of the first diaphragm c and the first electrode piece a in the second composite sheet f. Thus, the second image acquisition device 72 can detect the OH of the first diaphragm c exceeding the first electrode piece a. "The OH of the first diaphragm c exceeding the first electrode piece a" refers to the extent to which the edge of the first diaphragm c extends beyond the active material area edge of the first electrode piece a in the width direction of the electrode piece. An OH defect means that the dimension of the exceeding portion does not meet the required size range.

[0280] For example, with reference to FIG5 , when the second aggregation mechanism 32 is a composite mechanism, the second image acquisition device 72 is disposed downstream of the second aggregation mechanism 32 and is capable of detecting the composite state of the second composite sheet f, such as detecting composite defects such as corner folding and damage of the first electrode sheet a.

[0281] For example, as shown in Figures 5, 8, and 9, a second image acquisition device 72 is provided on one side of the second composite sheet f in the thickness direction F1 to detect defects and other information within the second composite sheet f. The second image acquisition device 72 can sequentially inspect multiple locations along the length of the material while the material is in motion, or it can continuously inspect the material along its length.

[0282] The second image acquisition device 72 can be a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, or the like. The different image acquisition devices can be of the same or different types. For example, the second image acquisition device 72 can include a line array camera or an area array camera. Line array cameras have a narrower image acquisition range but higher accuracy. Therefore, as shown in FIG8 , line array cameras can be placed on both sides of the material width F2 to improve detection accuracy. Area array cameras have a wider image acquisition range but lower accuracy. Therefore, as shown in FIG9 , an area array camera can be placed in the middle of the material width F2 to reduce costs.

[0283] When the first polymerization mechanism 31 is an edge-sealing mechanism and the second polymerization mechanism 32 is a composite mechanism, the first image acquisition device 71 and the second image acquisition device 72 respectively detect the edge-sealing state and the composite state, enabling more comprehensive detection. Specifically, the second image acquisition device 72 can detect the accuracy of the relative position of the first electrode piece a and the first diaphragm c before the first diaphragm c and the second diaphragm d are edge-sealed, thereby improving the positional accuracy of the first diaphragm c and the first electrode piece a. Both sides of the first diaphragm c in the width direction F2 can extend sufficiently beyond the edge of the first electrode piece a to provide sufficient space for edge sealing, thereby improving the effectiveness of the first diaphragm c in separating the second electrode piece b from the first electrode piece a. This reduces the risk of missed defects during the production of the electrode assembly 200. In the produced electrode assembly 200, the second electrode piece b is less likely to overlap and short-circuit with the first electrode piece a, and the second electrode piece b is less likely to overlap with the housing 3011 of the battery cell 301, resulting in corrosion and leakage.

[0284] 4 and 5 , in some embodiments, when the winding device 100 includes a second polymerization mechanism 32, the winding device 100 may further include a first cache mechanism 81, which is disposed between the second polymerization mechanism 32 and the first polymerization mechanism 31, and is used to cache the second composite sheet f.

[0285] It is worth noting that "the first cache mechanism 81 is arranged between the second polymerization mechanism 32 and the first polymerization mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the first cache mechanism 81, the first polymerization mechanism 31, and the second polymerization mechanism 32 are not limited), but a restriction on the order of the work stations, that is, the second composite sheet f formed by the polymerization of the second polymerization mechanism 32 can first pass through the cache of the first cache mechanism 81 before entering the first polymerization mechanism 31.

[0286] Therefore, the first cache mechanism 81 can cache the second composite sheet f. When there is a speed difference before and after the first cache mechanism 81, the first cache mechanism 81 can cache and release part of the second composite sheet f in time, thereby solving the speed reduction problem or the wrinkle problem caused by insufficient tension, and improving production capacity and product quality.

[0287] 4 , a first cache mechanism 81 is provided between the second polymerization mechanism 32 and the first polymerization mechanism 31. The first cache mechanism 81 can cache part of the second composite sheet f after the first electrode a and the first diaphragm c are polymerized. The first cache mechanism 81 can cache part of the second composite sheet f when the winding needle 42 switches or other tension is reduced, and release the cached second composite sheet f when the tension is normal, so as to reduce the negative impact of the winding needle 42 switching, electrode sheet cutting or other situations on the feeding of the first feeding mechanism 11 and the third feeding mechanism 21, and reduce the occurrence of deceleration or shutdown of the first feeding mechanism 11 and the third feeding mechanism 21, so that the first feeding mechanism 11 and the third feeding mechanism 21 can continue to feed and improve production efficiency.

[0288] 4 , the first buffer mechanism 81 is disposed between the second polymerization mechanism 32 and the first polymerization mechanism 31 , and is used to wind the second composite sheet f formed by the first electrode a and the first separator c. The first buffer mechanism 81 refers to a structure in the winding apparatus 100 for temporarily storing electrode sheets and separators. The first buffer mechanism 81 is also capable of releasing the cached electrode sheets and separators. The first buffer mechanism 81 is disposed between the second polymerization mechanism 32 and the first polymerization mechanism 31 to wind the second composite sheet f. For example, after the first composite sheet e is wound on the winding needle 42 , the turret 41 drives the winding needle 42 to move the unused winding needle 42 to the side of the first polymerization mechanism 31 . During this process, the second composite sheet f lacks the tension provided by the winding needle 42 , which can lead to insufficient tension and feed rate. At this time, the first buffer mechanism 81 can buffer a portion of the second composite sheet f to supplement the tension of the second composite sheet f and reduce wrinkles in the second composite sheet f.

[0289] The first buffer mechanism 81 can store the second composite sheets f composited by the second polymerization mechanism 32 by winding, stacking, etc.

[0290] 4 , illustratively, the first buffer mechanism 81 may include one or more rollers, and the second composite sheet f can bypass the one or more rollers of the first buffer mechanism 81 and then enter the first polymerization mechanism 31. The first buffer mechanism 81 may include one or more movable rollers for the second composite sheet f to bypass. In the process of the turret 41 driving the winding needle 42 to move, the first buffer mechanism 81 stores the second composite sheet f. For example, the roller moves in a direction away from the second polymerization mechanism 32 and the first polymerization mechanism 31 to increase the length of the pole piece and the diaphragm between the second polymerization mechanism 32 and the first polymerization mechanism 31, thereby providing tension for the second composite sheet f and having the effect of caching part of the second composite sheet f. After the winding needle 42 is on one side of the first polymerization mechanism 31 and begins to wind the first composite sheet e, the first buffer mechanism 81 releases the second composite sheet f. For example, the roller moves in a direction close to the second polymerization mechanism 32 and the first polymerization mechanism 31, so that the second composite sheet f stored in the first buffer mechanism 81 can be pulled by the winding needle 42 and wound onto the winding needle 42 after passing through the first polymerization mechanism 31.

[0291] 4 , illustratively, the first cache mechanism 81 may include a first fixed roller 811 and a first floating roller 812 , wherein the position of the first fixed roller 811 is fixed relative to the second aggregation mechanism 32 , and the first floating roller 812 can approach or move away from the first fixed roller 811 to change the length of the first pole piece a and the first diaphragm c wound in the first cache mechanism 81 .

[0292] In conjunction with Figure 4, the first fixed roller 811 refers to the roller body in the first cache mechanism 81 whose position is fixed relative to the second aggregation mechanism 32, that is, the position of the first fixed roller 811 is also fixed relative to the casing; the first fixed roller 811 can be a cylindrical roller body, or a prismatic roller body or a roller body of other shapes; the material of the first fixed roller 811 can include plastic, metal or other materials; the first fixed roller 811 can be a rotatable structure or a fixed structure; the first fixed roller 811 can be a passive roller and rotates with the movement of the pole piece and the diaphragm, and the first fixed roller 811 can also be an active roller and rotates by being driven by a driving device such as a motor.

[0293] In conjunction with Figure 4, the first floating roller 812 refers to the roller body in the first cache mechanism 81 that can move relative to the first fixed roller 811, that is, the position of the movable roller can be changed on the casing; the first floating roller 812 can be a cylindrical roller body, or a prismatic roller body or a roller body of other shapes; the material of the first floating roller 812 can include plastic, metal or other materials; the first floating roller 812 can be a rotatable structure or a fixed structure; the first floating roller 812 can be a passive roller and rotate with the movement of the pole piece and the diaphragm, and the first floating roller 812 can also be an active roller and rotate by being driven by a driving device such as a motor.

[0294] 4 , the first floating roller 812 can move toward or away from the first fixed roller 811. When the first floating roller 812 moves away from the first fixed roller 811, the first buffer mechanism 81 stores the second composite sheet f. At this time, the length of the second composite sheet f between the second aggregation mechanism 32 and the first aggregation mechanism 31 increases, and the movement of the first floating roller 812 can also supplement the missing tension on the second composite sheet f. When the first floating roller 812 moves toward the first fixed roller 811, the first buffer mechanism 81 releases the second composite sheet f.

[0295] With reference to Figure 4 , the floating of the first floating roller 812 can be either passive or active. In some embodiments, the floating of the first floating roller 812 is achieved by an elastic member such as a spring or a rubber strip. In this case, the first floating roller 812 is passively floating. When the winding needle 42 winds the first composite sheet e, the tension on the second composite sheet f is greater, causing the first floating roller 812 to move toward the first fixed roller 811, and the elastic member is deformed. As the turret 41 drives the winding needle 42, the tension on the second composite sheet f decreases, causing the elastic member to return to its original shape and drive the first floating roller 812 away from the first fixed roller 811. In other embodiments, the floating of the first floating roller 812 is achieved by active power devices such as air cylinders and hydraulic cylinders. In this case, the first floating roller 812 is actively floating; when the winding needle 42 winds the first composite sheet e, the tension on the second composite sheet f is large, and the power device drives the first floating roller 812 to move toward the first fixed roller 811; in the process of the turret 41 driving the winding needle 42 to move, the tension on the second composite sheet f decreases, and the power device drives the first floating roller 812 to move away from the first fixed roller 811.

[0296] 4 , the number of first fixed rollers 811 may be one, or two or more; the number of floating rollers may be one, or two or more; when the number of first fixed rollers 811 and first floating rollers 812 are both two or more, the first fixed rollers 811 and the first floating rollers 812 may be alternately arranged in sequence.

[0297] 4 , the first floating roller 812 is used to achieve the caching and releasing effects of the second composite sheet f. For example, when the second composite sheet f needs to be cached, the first floating roller 812 can move in a direction away from the first fixed roller 811 to increase the length of the second composite sheet f in the first cache mechanism 81. When the second composite sheet f needs to be released, the first floating roller 812 can move in a direction close to the first fixed roller 811 to reduce the length of the second composite sheet f in the first cache mechanism 81.

[0298] 4 , exemplarily, the first electrode piece a is a cathode electrode piece, and the first cache mechanism 81 is used to cache the cathode electrode piece and the first diaphragm c after being compounded by the second polymerization mechanism 32. Affected by the materials, the cathode electrode piece and the first diaphragm c can be combined more stably after compounding, so that the cathode electrode piece and the first diaphragm c are not easily separated during the process of passing through the first cache mechanism 81.

[0299] 4 and 5 , in some embodiments, when the winding device 100 includes the first buffer mechanism 81 , the first cutting mechanism 61 for cutting the first electrode piece a may be provided between the first feeding mechanism 11 and the second aggregation mechanism 32 .

[0300] It is worth noting that "the first cutting mechanism 61 is arranged between the first feeding mechanism 11 and the second aggregation mechanism 32" is not a restriction on the spatial position (that is, in space, the relative positions of the first cutting mechanism 61, the first feeding mechanism 11, and the second aggregation mechanism 32 are not limited), but a restriction on the order of the work stations, that is, the first electrode a output by the first feeding mechanism 11 can be cut by the first cutting mechanism 61 before entering the second aggregation mechanism 32.

[0301] For example, with reference to FIG5 , the first cutting mechanism 61 can cut the first electrode piece a and then feed it in sections to the second polymerization mechanism 32, or it can feed the already segmented first electrode piece a in sections to the second polymerization mechanism 32 by inserting the pieces. For example, the first cutting mechanism 61 can include components such as a feed roller and a cutting knife.

[0302] During the production process, the first buffer mechanism 81 buffers material and continuously delivers it downstream, allowing the winding needle 42 to operate without slowing down, unaffected by the operations of the first cutting mechanism 61 upstream of the first buffer mechanism 81. For example, as shown in Figure 5, the first cutting mechanism 61 requires high precision when cutting the first electrode sheet a, resulting in a slow operation speed. The first buffer mechanism 81 is used to buffer the second composite sheet f, which is the result of the polymerization of the first electrode sheet a and the first separator c, allowing the winding needle 42 to operate at a faster speed. The first buffer mechanism 81 buffers material, allowing the first buffer mechanism 81 to continue feeding the second composite sheet f to the first polymerization mechanism 31 while the first cutting mechanism 61 is cutting the first electrode sheet a, without slowing the winding needle 42 speed, thereby improving winding efficiency and overall production capacity. Furthermore, the first cutting mechanism 61 can be spatially separated from the winding mechanism 40, preventing the adverse effects of cutting chips falling onto the electrode assembly 200 being wound on the winding needle 42, thereby further improving the quality of the electrode assembly 200.

[0303] When the winding apparatus 100 includes a first buffer mechanism 81, the second image acquisition device 72 can be located upstream of the first buffer mechanism 81 (e.g., as shown in the embodiment of FIG. 4 ). The second image acquisition device 72 can also be located downstream of the first buffer mechanism 81 (e.g., as shown in the embodiment of FIG. 5 ). As shown in FIG. 5 , when the second image acquisition device 72 is located downstream of the first buffer mechanism 81, the second image acquisition device 72 can detect the second composite sheet f released from the first buffer mechanism 81. Thus, defects in the second composite sheet f generated during the polymerization process and the buffering process can be detected by the second image acquisition device 72, which is beneficial for improving the quality of the electrode assembly 200 used in production.

[0304] For example, in combination with Figure 5, when the fourth feeding mechanism 22 is arranged upstream of the first polymerization mechanism 31 so that the second diaphragm d is also polymerized in the first composite sheet e, the third cutting mechanism 63 can be arranged between the first polymerization mechanism 31 and the winding mechanism 40. The first cutting mechanism 61 and the second cutting mechanism 62 can cut off the first electrode sheet a and the second electrode sheet b before the first polymerization mechanism 31, and the third cutting mechanism 63 cuts off the first diaphragm c and the second diaphragm d after the first polymerization mechanism 31. As a result, it is relatively easy to make the length of the diaphragm greater than the length of the electrode sheet, thereby meeting the design requirements of the electrode assembly 200, and only one third cutting mechanism 63 needs to be set, which can simplify the equipment, reduce costs, and save space.

[0305] Furthermore, when the first buffer mechanism 81 is provided, during the production process, the first buffer mechanism 81 buffers the material and continuously transfers it downstream, allowing the third cutting mechanism 63 to perform cutting operations without deceleration, unaffected by the operation of the first cutting mechanism 61 upstream of the first buffer mechanism 81. For example, as shown in FIG5 , the first cutting mechanism 61 requires high precision in cutting the first electrode sheet a, resulting in a slow operation speed. The first buffer mechanism 81 is used to buffer the second composite sheet f, which is the composite of the first electrode sheet a and the first separator c. The third cutting mechanism 63 is used to cut the first separator c and the second separator d, requiring lower precision and operating at a faster speed. The first buffer mechanism 81 buffers the material, allowing the first buffer mechanism 81 to continue to transfer the second composite sheet f to the first aggregation mechanism 31 while the first cutting mechanism 61 is cutting the first electrode sheet a, without reducing the speed of the first aggregation mechanism 31. The third cutting mechanism 63 can cut the strip electrode assembly 200 without deceleration, improving winding efficiency and thereby increasing overall production capacity.

[0306] The third cutting mechanism 63 may include a variety of cutting structures, such as a linear cutter that reciprocates along a straight line, a cam cutter that rotates around an axis, a laser cutting structure, and the like.

[0307] 4 , exemplarily, the first cutting mechanism 61 is arranged between the first feeding mechanism 11 and the second aggregation mechanism 32 , and includes a first cutter 611 and a first push member 612 . The first cutter 611 and the first push member 612 are arranged opposite to each other and spaced apart to allow the first pole piece a to pass through. The first cutter 611 is used to cut off the first pole piece a on the first push member 612 .

[0308] 4 , the first cutter 611 and the first abutting member 612 are both part of the electrode cutting assembly 61 . The first cutter 611 and the first abutting member 612 are disposed between the first feeding mechanism 11 and the second aggregation mechanism 32 to cut the first electrode a.

[0309] In conjunction with Figure 4, the first cutter 611 refers to the structure in the winding device 100 for cutting the electrode piece; according to the shape of the first cutter 611, the first cutter 611 can be a grooving knife, a cutting knife or other types of cutters; according to the driving force of the first cutter 611, the first cutter 611 can realize the cutting action through the motor in conjunction with the cam and the rocker arm, and the first cutter 611 can also be driven by a cylinder, a hydraulic cylinder and other devices to realize the reciprocating cutting action; in some embodiments, the first electrode piece a is a cathode electrode piece. Because the material of the cathode electrode piece usually includes lithium iron phosphate, lithium cobalt oxide or silicon-based materials, vanadate materials, etc., the incision is easy to be rough or produce burrs when cutting, so the first cutter 611 is driven by a cylinder to reduce the roughness of the incision and reduce burrs.

[0310] In conjunction with Figure 4, the first resisting member 612 refers to a structure in the winding device 100 that supports the first cutter 611. The first pole piece a can pass through the first resisting member 612, and when the first cutter 611 cuts the first pole piece a, it can press the first pole piece a onto the first resisting member 612 and cut it off; the material of the first resisting member 612 can include plastic, metal or other materials.

[0311] 4 , the first abutting member 612 may be a rectangular thin plate structure, a cylindrical structure or other structures; the first abutting member 612 may be a fixed structure or a rotatable structure to reduce the friction between the first pole piece a and the first abutting member 612 .

[0312] 4 , the first cutter 611 and the first push member 612 are arranged relative to each other, and the first pole piece a can pass through the gap between the first cutter 611 and the first push member 612; when the first cutter 611 is raised, the distance between the first cutter 611 and the first push member 612 should be greater than the thickness of the first pole piece a to reduce the negative impact of the first cutter 611 on the first pole piece a.

[0313] 4 , the first electrode piece a cut by the first cutter 611 and the first abutting member 612 is aggregated with the first diaphragm c through the second aggregation mechanism 32 . At this time, the first diaphragm c can carry the cut first electrode piece a through the first buffer mechanism 81 to move to the first aggregation mechanism 31 .

[0314] 4 , the first cutter 611 and the first push member 612 are arranged between the first feeding mechanism 11 and the second aggregation mechanism 32 , and the first push member 612 supports the first pole piece a and provides support for the first cutter 611 to cut the first pole piece a, and the pole piece is cut by the first cutter 611 to achieve cutting of the first pole piece a.

[0315] In conjunction with FIG. 4 and FIG. 5 , in some embodiments, when the winding apparatus 100 includes the second polymerization mechanism 32 , the second electrode piece b and the second separator d can be fed separately into the first polymerization mechanism 31 . That is, the second electrode piece b and the second separator d are not pre-polymerized before entering the first polymerization mechanism 31 . This simplifies the structure.

[0316] 4 and 5 , when the second electrode piece b and the second diaphragm d are fed into the first polymerization mechanism 31 separately, the second cutting mechanism 62 for cutting off the second electrode piece b may be provided between the second feeding mechanism 12 and the first polymerization mechanism 31 .

[0317] It is worth noting that "the second cutting mechanism 62 is arranged between the second feeding mechanism 12 and the first aggregation mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the second cutting mechanism 62, the second feeding mechanism 12, and the first aggregation mechanism 31 are not limited), but a restriction on the order of the work stations, that is, the second electrode b output by the second feeding mechanism 12 is cut off by the second cutting mechanism 62 before entering the first aggregation mechanism 31.

[0318] Therefore, the second cutting mechanism 62 can be set spatially away from the winding mechanism 40 to solve the adverse effect on the quality of the electrode assembly 200 caused by the chips formed by cutting falling into the electrode assembly 200 wound on the winding needle 42, thereby helping to further improve the quality of the electrode assembly 200.

[0319] 4 , in some embodiments, the second cutting mechanism 62 includes a cam cutter. Thus, the second cutting mechanism 62 does not need to chase the second pole piece b, and the second pole piece b does not need to slow down to cope with the cutting. Thus, the second cutting mechanism 62 can cut the second pole piece b without deceleration, thereby increasing production capacity. Furthermore, since the space required for chase cutting is eliminated, it helps reduce space usage.

[0320] 4 , illustratively, the second cutting mechanism 62 includes a first cam cutter 621 and a second push member 622 , which are arranged opposite to and spaced apart from each other to allow the second pole piece b to pass through, and the first cam cutter 621 can rotate and cut off the second pole piece b on the second push member 622 .

[0321] 4 , the first cam cutter 621 and the second abutting member 622 are both part of the pole piece cutting assembly 61 , and the first cam cutter 621 and the second abutting member 622 are used to cut the second pole piece b.

[0322] Combined with Figure 4, the first cam cutter 621 can act intermittently and cut off the second pole piece b. The length of the cut second pole piece b can be adjusted by adjusting the time between two adjacent cuts by the first cam cutter 621. The cam cutter has the advantages of higher efficiency, higher precision, more precise intermittent indexing action, and more stable rotation, and can more accurately achieve periodic interval cutting of the second pole piece b.

[0323] In conjunction with Figure 4, the periodic interval cutting of the first cam cutter 621 can be achieved through a variety of structures; for example, the first cam cutter 621 may include a driving device, a cam, a rocker arm and a cutter, and the driving device drives the cam to rotate and drives the rocker arm to reciprocate, so that the cutter intermittently cuts the second pole piece b. At this time, the intermittent time of the cutter = the required length of the second pole piece b / the linear velocity of the cam; for another example, the first cam cutter 621 can also be through a driving device, a crank slider mechanism and a cutter, and the driving device drives the driving slider mechanism to move, thereby driving the cutter to reciprocate through the crank slider mechanism. At this time, the intermittent time of the cutter = the required length of the second pole piece b / the linear velocity output by the driving device; it can be understood that the periodic interval cutting action of the first cam cutter 621 can also be achieved through other structures, and is not limited to the above two types.

[0324] In conjunction with Figure 4, the second push member 622 refers to a structure in the winding device 100 that supports the first cam cutter 621. The second pole piece b can pass through the second push member 622. When the first cam cutter 621 cuts off the second pole piece b, it can press the second pole piece b on the second push member 622 and cut it off; the material of the second push member 622 can include plastic, metal or other materials.

[0325] 4 , the second push member 622 may be a rectangular thin plate structure, a cylindrical structure or other structures; the second push member 622 may be a fixed structure or a rotatable structure to reduce the friction between the second pole piece b and the second push member 622; in some embodiments, the second push member 622 is a roller structure rotatably connected to the housing, and when the first cam cutter 621 cuts off the second pole piece b, it can press the second pole piece b on the roller mechanism and cut off the second pole piece b.

[0326] 4 , the first cam cutter 621 and the second push member 622 are arranged relative to each other, and the second pole piece b can pass through the gap between the first cam cutter 621 and the second push member 622; when the first cam cutter 621 is raised, the distance between the first cam cutter 621 and the second push member 622 should be greater than the thickness of the second pole piece b to reduce the negative impact of the first cam cutter 621 on the first pole piece a.

[0327] In conjunction with Figure 4, this embodiment provides some specific structures of the pole piece cutting assembly 61, and the first cam cutter 621 and the second push member 622 are arranged between the second feeding mechanism 12 and the first polymerization mechanism 31. The second push member 622 supports the second pole piece b and provides support for the first cam cutter 621 to cut the second pole piece b, and the pole piece is cut by the first cam cutter 621 to achieve the cutting of the first pole piece a. The intermittent indexing action of the cam cutter structure has high accuracy and does not require other structures to control its intermittent position, which is convenient for control and can also simplify the structure of the cutter.

[0328] 4 , illustratively, the third cutting mechanism 63 may include a second cam cutter 631 and a third abutting member 632 that are spaced relative to each other. The second cam cutter 631 is capable of rotating and cutting the diaphragm on the third abutting member 632. The second cam cutter 631 refers to the mechanism in the third cutting mechanism 63 for cutting the diaphragm; the second cam cutter 631 is capable of intermittent operation and cutting the diaphragm, and the length of the cut diaphragm can be adjusted by adjusting the time between two adjacent cuts by the second cam cutter 631; the cam cutter has the advantages of high efficiency, high precision, more precise intermittent indexing action, and relatively smooth rotation, and can more accurately achieve periodic interval cutting of the diaphragm.

[0329] 4 , the periodic interval cutting of the second cam cutter 631 can be achieved through a variety of structures; for example, the second cam cutter 631 may include a driving device, a cam, a rocker arm and a cutter, and the driving device drives the cam to rotate and drives the rocker arm to reciprocate, so that the cutter intermittently cuts the diaphragm, and the intermittent time of the cutter = the required length of the diaphragm / the linear speed of the cam; for another example, the second cam cutter 631 may also be a driving device, a crank slider mechanism and a cutter, and the driving device drives the driving slider mechanism to move, thereby driving the cutter to reciprocate through the crank slider mechanism, and the intermittent time of the cutter = the required length of the diaphragm / the linear speed output by the driving device; it can be understood that the periodic interval cutting action of the second cam cutter 631 can also be achieved through other structures, and is not limited to the above two types.

[0330] 4 , the third push member 632 refers to a structure in the third cutting mechanism 63 that supports the second cam cutter 631 . The diaphragm can pass through the third push member 632 , and when the second cam cutter 631 cuts the diaphragm, it can press the diaphragm against the third push member 632 and cut it off. The material of the third push member 632 may include plastic, metal or other materials.

[0331] 4 , the third resisting member 632 may be a rectangular thin plate structure, a cylindrical structure or other structures; the third resisting member 632 may be a fixed structure or a rotatable structure to reduce the friction between the diaphragm and the third resisting member 632; in some embodiments, the third resisting member 632 is a roller structure rotatably connected to the housing, and the second cam cutter 631 can press the diaphragm onto the roller mechanism and cut the diaphragm when cutting the diaphragm.

[0332] In conjunction with Figure 4, this embodiment provides some specific structures of the third cutting mechanism 63, and the cutting of the diaphragm is achieved by the second cam cutter 631 and the third push member 632. The second cam cutter 631 can perform the cutting action periodically and intermittently. By controlling the intermittent duration of the second cam cutter 631, the length of the diaphragm can be controlled. The intermittent indexing action of the cam cutter is highly accurate and does not require other structures to control its position during the intermittent period. It is easy to control and can also simplify the structure of the cutter.

[0333] In some embodiments, the rotation cycle length of the second cam cutter 631 is equal to the ratio of the length of the first diaphragm c in the electrode assembly 200 to the transmission line speed of the first diaphragm c; and / or, the rotation cycle length of the second cam cutter 631 is equal to the ratio of the length of the second diaphragm d in the electrode assembly 200 to the transmission line speed of the second diaphragm d.

[0334] The rotation cycle length of the second cam cutter 631 is the time taken for the second cam cutter 631 to rotate one circle; the membrane to be cut may be the first diaphragm c and / or the second diaphragm d. By cutting the first diaphragm c and / or the second diaphragm d, a first diaphragm c and / or a second diaphragm d of a preset length can be formed in the electrode assembly 200; the transmission line speed of the membrane to be cut refers to the transmission line speed of the membrane to be cut before it enters the winding mechanism 40.

[0335] The first diaphragm c and the second diaphragm d are conveyed toward the winding mechanism 40 at the same time and have the same transmission line speed. The lengths of the first diaphragm c and the second diaphragm d in the electrode assembly 200 can be equal or different. For example, the length of the first diaphragm c in the electrode assembly 200 is greater than the length of the second diaphragm d. Then, the rotation cycle length of the second cam cutter 631 is equal to the ratio of the length of the first diaphragm c in the electrode assembly 200 to the transmission line speed of the first diaphragm c.

[0336] By meeting the above conditions, the second cam cutter 631 can rotate continuously. Since the second cam cutter 631 does not need to stop, the time waiting for cutting is saved; the second cam cutter 631 can cut the film to be cut every time it rotates one circle. There is no need to reduce the transmission line speed of the film in order to cut the film, and the film can be cut without deceleration, which effectively improves the overall winding speed.

[0337] In other embodiments, if the second cam cutter 631 needs to move toward the third abutting member 632 after rotating, the rotation cycle of the second cam cutter 631 may also be less than the ratio of the length of the film to be cut to the transmission line speed of the film to be cut.

[0338] In the embodiments of the present application, the second electrode piece b and the second separator d may not be fed separately into the first polymerization mechanism 31. For example, with reference to FIG10 , in some embodiments of the present application, the winding device 100 further includes: a third polymerization mechanism 33, which is located upstream of the first polymerization mechanism 31 and downstream of the second feeding mechanism 12 and the fourth feeding mechanism 22. The third polymerization mechanism 33 is used to aggregate the second electrode piece b and the second separator d into a third composite sheet g.

[0339] At this time, the second electrode piece b and the second diaphragm d can be polymerized by the third polymerization mechanism 33 before entering the first polymerization mechanism 31. That is, the second electrode piece b on the second feeding mechanism 12 and the second diaphragm d on the fourth feeding mechanism 22 can both be conveyed to the third polymerization mechanism 33 and polymerized by the third polymerization mechanism 33. The third polymerization mechanism 33 is used to polymerize the second electrode piece b and the second diaphragm d; the polymerization of the second electrode piece b and the second diaphragm d refers to the second electrode piece b and the second diaphragm d being stacked into a third composite sheet g. The second electrode piece b and the second diaphragm d in the third composite sheet g can be in contact without being connected, or they can be in contact and connected, that is, the second electrode piece b and the second diaphragm d in the third composite sheet g are in a connected or non-connected bonding state.

[0340] Therefore, by setting the third polymerization mechanism 33 upstream of the first polymerization mechanism 31, the second electrode b and the second diaphragm d can be polymerized preferentially. The number of material layers polymerized here is relatively small, and the polymerization quality can be better controlled. The relative position of the second electrode b and the second diaphragm d, as well as the respective states of the second electrode b and the second diaphragm d can be better guaranteed, thereby improving product quality.

[0341] In conjunction with Figure 10, the type of the third polymerization mechanism 33 is not limited, and can be specifically set according to whether the second electrode b and the second diaphragm d in the third composite sheet g need to be connected. For example, the third polymerization mechanism 33 can be formed into a composite mechanism that is the same as or similar to the above-mentioned second polymerization mechanism 32. When the third polymerization mechanism 33 is a composite mechanism, it can be used to fix the second electrode b and the second diaphragm d in the third composite sheet g. Thereby reducing the displacement of the second electrode b relative to the second diaphragm d during winding and use, it is beneficial to improve the accuracy of the relative position between the materials, thereby improving product quality. Among them, the method of fixed connection is not limited, for example, it can be connected by cold pressing, hot pressing, gluing, etc. In addition, the position of the fixed connection is not limited, and it can be the entire surface or a part, such as a part in the center, or a part at the edge, etc.

[0342] Of course, the present application is not limited to this. In other embodiments of the present application, the third polymerization mechanism 33 is not limited to a composite mechanism. For example, the third polymerization mechanism 33 can also be a mechanism for stacking the second electrode b and the second diaphragm d in the third composite sheet g together without connecting them.

[0343] With reference to FIG10 , in some embodiments, when the winding apparatus 100 includes a third aggregating mechanism 33, the winding apparatus 100 may further include a third detection device, comprising a third image acquisition device 73. The third image acquisition device 73 is located between the third aggregating mechanism 33 and the first aggregating mechanism 31 and is configured to detect the third composite sheet g. The third image acquisition device 73 may be communicatively connected to the processor 702, or the third detection device may comprise a separate processor that is communicatively connected to the third image acquisition device 73.

[0344] It is worth noting that "the third image acquisition device 73 is located between the third aggregation mechanism 33 and the first aggregation mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the third image acquisition device 73, the third aggregation mechanism 33, and the first aggregation mechanism 31 are not limited), but a restriction on the order of the workstations, that is, the third composite sheet g formed by the aggregation of the third aggregation mechanism 33 can first be inspected by the third image acquisition device 73 before entering the first aggregation mechanism 31.

[0345] With reference to Figure 10 , a third image acquisition device 73 is disposed between the third aggregation mechanism 33 and the first aggregation mechanism 31 and is used to inspect the third composite sheet g. Exemplarily, the third image acquisition device 73 may include a camera, a machine vision detection device, or other structures. Exemplarily, the third image acquisition device 73 may also include other components, such as a control device. The third image acquisition device 73 can capture image information (e.g., position, color, shape, etc.) of the third composite sheet g, convert this image information into a digital signal, and transmit it to the control device, which then determines whether the third composite sheet g meets requirements according to a preset program.

[0346] 10 , by disposing a third image acquisition device 73 between the third polymerization mechanism 33 and the first polymerization mechanism 31, the third image acquisition device 73 can be used to detect the third composite sheet g polymerized by the third polymerization mechanism 33 and which has not entered the first polymerization mechanism 31, so as to promptly discover defects and abnormalities in the third composite sheet g, thereby facilitating timely response when problems occur in the third composite sheet g, thereby reducing the negative impact on subsequent processes and improving product quality.

[0347] In conjunction with Figure 10 , the third image acquisition device 73 is used to detect the relative positions of the second electrode piece b and the second diaphragm d in the third composite sheet g. Thus, the third image acquisition device 73 can detect the OH of the second diaphragm d exceeding the second electrode piece b. "The OH of the second diaphragm d exceeding the OH of the second electrode piece b" refers to the extent to which the edge of the second diaphragm d extends beyond the active material area of ​​the second electrode piece b in the width direction of the electrode piece. A defective OH refers to the extent to which the excess does not meet the required size range.

[0348] 10 , when the third aggregation mechanism 33 is a composite mechanism, the third image acquisition device 73 is located downstream of the third aggregation mechanism 33 and is capable of detecting the composite state of the third composite sheet g, such as detecting composite defects such as corner folds and breakage of the second electrode sheet b.

[0349] For example, a third image acquisition device 73 is provided on one side of the third composite sheet g in the thickness direction F1 to detect defects and other information within the second composite sheet f. The third image acquisition device 73 can sequentially inspect multiple locations along the length of the material while it is in motion, or it can continuously inspect the material along its length.

[0350] For example, the third image acquisition device 73 may be a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, or the like. The different image acquisition devices may be of the same or different types. For example, the third image acquisition device 73 may include a line array camera or an area array camera. Line array cameras have a narrower image acquisition range but higher acquisition accuracy, allowing for the placement of line array cameras on both sides of the material width F2 to improve detection accuracy. Area array cameras have a wider image acquisition range but lower acquisition accuracy, allowing for the placement of an area array camera in the middle of the material width F2 to reduce costs.

[0351] When the first polymerization mechanism 31 is an edge-sealing mechanism and the third polymerization mechanism 33 is a composite mechanism, the edge-sealing state and composite state are respectively detected by the first image acquisition device 71 and the third image acquisition device 73, enabling more comprehensive detection. Specifically, the third image acquisition device 73 can detect the accuracy of the relative positions of the second electrode piece b and the second diaphragm d before the first diaphragm c and the second diaphragm d are edge-sealed. This improves the positional accuracy of the second electrode piece b and the second diaphragm d. Both sides of the second diaphragm d in the width direction F2 can extend sufficiently beyond the edge of the second electrode piece b to provide sufficient space for edge sealing, thereby improving the effectiveness of the first diaphragm c in separating the second electrode piece b from the first electrode piece a. This reduces the risk of missed defects during the production of the electrode assembly 200. In the produced electrode assembly 200, the second electrode piece b is less likely to overlap and short-circuit with the first electrode piece a, and the second electrode piece b is less likely to overlap with the housing 3011 of the battery cell 301, resulting in corrosion and leakage.

[0352] 10 , when the winding device 100 includes a third polymerization mechanism 33 , in some embodiments, the winding device 100 may further include a second cache mechanism 82 , which is disposed between the third polymerization mechanism 33 and the first polymerization mechanism 31 and is used to cache the third composite sheet g.

[0353] It is worth noting that "the second cache mechanism 82 is arranged between the third aggregation mechanism 33 and the first aggregation mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the second cache mechanism 82, the first aggregation mechanism 31, and the third aggregation mechanism 33 are not limited), but a restriction on the order of the work stations, that is, the third composite sheet g formed by the aggregation of the third aggregation mechanism 33 can first pass through the cache of the second cache mechanism 82 before entering the first aggregation mechanism 31.

[0354] Therefore, the second cache mechanism 82 can cache the third composite sheet g. When there is a speed difference before and after the second cache mechanism 82, the second cache mechanism 82 can cache and release part of the third composite sheet g in time, thereby solving the speed reduction problem or the wrinkle problem caused by insufficient tension, and improving production capacity and product quality.

[0355] In conjunction with Figure 10, a second cache mechanism 82 is arranged between the third polymerization mechanism 33 and the first polymerization mechanism 31. The second cache mechanism 82 can cache part of the third composite sheet g after the second electrode b and the second diaphragm d are polymerized. The second cache mechanism 82 can cache part of the third composite sheet g when the winding needle 42 switches or other tension is reduced, and release the cached third composite sheet g when the tension is normal, so as to reduce the negative impact of the winding needle 42 switching, electrode cutting or other situations on the feeding of the second feeding mechanism 12 and the fourth feeding mechanism 22, and reduce the occurrence of deceleration or shutdown of the second feeding mechanism 12 and the fourth feeding mechanism 22, so that the second feeding mechanism 12 and the fourth feeding mechanism 22 can continue to feed and improve production efficiency.

[0356] In conjunction with Figure 10 , the second buffer mechanism 82 is disposed between the third aggregation mechanism 33 and the first aggregation mechanism 31 , and is used to wind the third composite sheet g formed by the second electrode sheet b and the second separator d. The second buffer mechanism 82 refers to a structure in the winding apparatus 100 that temporarily stores electrode sheets and separators. The second buffer mechanism 82 is also capable of releasing the buffered electrode sheets and separators. The second buffer mechanism 82 is disposed between the third aggregation mechanism 33 and the first aggregation mechanism 31 to wind the third composite sheet g. For example, after the first composite sheet e is wound on the winding needle 42 , the turret 41 drives the winding needle 42 to move the unused winding needle 42 to the side of the first aggregation mechanism 31 . During this process, the third composite sheet g lacks the tension provided by the winding needle 42 , which can lead to insufficient tension and feed rate. At this time, the second buffer mechanism 82 can buffer a portion of the third composite sheet g to supplement the tension of the third composite sheet g and reduce wrinkles in the third composite sheet g.

[0357] The second buffer mechanism 82 can store the third composite sheet g composited by the third polymerization mechanism 33 by winding, stacking, etc. For example, the structure of the second buffer mechanism 82 can be the same or similar to that of the first buffer mechanism 81, which will not be described in detail here.

[0358] 10 , in some embodiments, when the winding device 100 includes a second buffer mechanism 82 , the second cutting mechanism 62 for cutting the second electrode piece b may be provided between the second feeding mechanism 12 and the third aggregation mechanism 33 .

[0359] It is worth noting that "the second cutting mechanism 62 is arranged between the second feeding mechanism 12 and the third aggregation mechanism 33" is not a restriction on the spatial position (that is, in space, the relative positions of the second cutting mechanism 62, the second feeding mechanism 12, and the third aggregation mechanism 33 are not limited), but a restriction on the order of the work stations, that is, the second electrode b output by the second feeding mechanism 12 can be cut off by the second cutting mechanism 62 before entering the third aggregation mechanism 33.

[0360] For example, with reference to FIG10 , the second cutting mechanism 62 can cut the second electrode piece b and then feed it in sections to the third aggregation mechanism 33, or can feed the already segmented second electrode piece b in sections to the third aggregation mechanism 33 by inserting the pieces. For example, the second cutting mechanism 62 can include components such as a feed roller and a cutting knife.

[0361] During the production process, the second buffer mechanism 82 buffers material and continuously delivers it downstream, allowing the winding needle 42 to operate without slowing down, unaffected by the operations of the second cutting mechanism 62 upstream of the second buffer mechanism 82. For example, as shown in Figure 10, the second cutting mechanism 62 requires high precision when cutting the second electrode sheet b, resulting in a slow operation speed. The second buffer mechanism 82 is used to buffer the third composite sheet g after the second electrode sheet b and the second separator d are aggregated, allowing the winding needle 42 to operate at a faster speed. The second buffer mechanism 82 buffers the material, allowing the second buffer mechanism 82 to continue feeding the third composite sheet g to the third aggregation mechanism 33 while the second cutting mechanism 62 is cutting the second electrode sheet b, without slowing the winding needle 42 speed, thereby improving winding efficiency and overall production capacity. Furthermore, the second cutting mechanism 62 can be spatially located away from the winding mechanism 40, preventing the adverse effects of cutting chips falling onto the electrode assembly 200 being wound on the winding needle 42, thereby further improving the quality of the electrode assembly 200.

[0362] When the winding apparatus 100 includes a second buffer mechanism 82, the third image acquisition device 73 can be located upstream of the second buffer mechanism 82 (for example, in the embodiment shown in FIG10 ). The third image acquisition device 73 can also be located downstream of the second buffer mechanism 82. When the third image acquisition device 73 is located downstream of the second buffer mechanism 82, the third image acquisition device 73 can detect the third composite sheet g released from the second buffer mechanism 82. Thus, defects in the third composite sheet g generated during the polymerization process and the buffering process can be detected by the third image acquisition device 73, which is beneficial for improving the quality of the electrode assembly 200 produced.

[0363] When the fourth feeding mechanism 22 is positioned upstream of the first polymerization mechanism 31, it is not necessary to polymerize one electrode piece and one diaphragm first. For example, the first diaphragm c, the second electrode piece b, and the second diaphragm d may be polymerized first (see, for example, Figures 11-15 ); or the first electrode piece a, the first diaphragm c, and the second electrode piece b may be polymerized first (see, for example, Figure 16 ).

[0364] In combination with Figures 11 to 15, in some embodiments, when the fourth feeding mechanism 22 is arranged upstream of the first polymerization mechanism 31, the winding device 100 may further include a fifth polymerization mechanism 35, the fifth polymerization mechanism 35 is located upstream of the first polymerization mechanism 31, and the fifth polymerization mechanism 35 is located downstream of the third feeding mechanism 21, the second feeding mechanism 12 and the fourth feeding mechanism 22, the fifth polymerization mechanism 35 is used to aggregate the first diaphragm c, the second electrode b and the second diaphragm d into a fifth composite sheet j.

[0365] The second electrode piece b in the fifth composite sheet j is stacked between the first diaphragm c and the second diaphragm d, but the connection state of the first diaphragm c, the second electrode piece b and the second diaphragm d is not limited. For example, the second electrode piece b and the second diaphragm d in the fifth composite sheet j can be in contact but not connected, or they can be in contact and connected, so that the second electrode piece b and the second diaphragm d in the fifth composite sheet j are in a state of connection or non-connection. The second electrode piece b and the first diaphragm c in the fifth composite sheet j can be in contact but not connected, or they can be in contact and connected, so that the second electrode piece b and the first diaphragm c in the fifth composite sheet j are in a state of connection or non-connection. The edge of the second diaphragm d and the edge of the first diaphragm c in the fifth composite sheet j can be in contact but not connected, or they can be in contact and connected with edge sealing.

[0366] 11 and 12 , the second electrode piece b can be pulled from the second feeding mechanism 12 to the fifth polymerization mechanism 35, the second separator d can be pulled from the fourth feeding mechanism 22 to the fifth polymerization mechanism 35, the first separator c can be pulled from the third feeding mechanism 21 to the fifth polymerization mechanism 35, and the first electrode piece a can be pulled from the first feeding mechanism 11 to the first polymerization mechanism 31. The fifth polymerization mechanism 35 is used to sequentially stack the second separator d, the second electrode piece b, and the first separator c to form a fifth composite piece j. The first polymerization mechanism 31 is used to stack the first electrode piece a and the fifth composite piece j to form a first composite piece e. The first composite piece e is pulled from the first polymerization mechanism 31 to the winding mechanism 40 and wound by the winding mechanism 40 to form the electrode assembly 20.

[0367] Thus, by providing the fifth polymerization mechanism 35 and the first polymerization mechanism 31, the second diaphragm d, the second electrode piece b, the first diaphragm c, and the first electrode piece a are formed into the first composite sheet e in two sequential steps. This allows for more stringent control over the operation of forming the first composite sheet e from the second diaphragm d, the second electrode piece b, the first diaphragm c, and the first electrode piece a, thereby helping to improve the quality of the first composite sheet e, and thereby helping to improve the quality of the electrode assembly 200. By adopting the above technical solution, the fifth polymerization mechanism 35 can first form the fifth composite sheet j containing the second electrode piece b, and then the first polymerization mechanism 31 can form the first composite sheet e containing the first electrode piece a. The second electrode piece b and the first electrode piece a are polymerized sequentially. This allows for separate control over the polymerization quality of the second electrode piece b and the first electrode piece a, thereby helping to improve the quality of the first composite sheet e, and thereby improving the quality of the electrode assembly 200.

[0368] Furthermore, by providing the fifth polymerization mechanism 35 and the first polymerization mechanism 31, the second separator d, the second electrode piece b, the first separator c, and the first electrode piece a are composited in two composite steps to form the first composite piece e. Furthermore, a larger space can be provided between the fifth polymerization mechanism 35 and the first polymerization mechanism 31, thereby improving the layout rationality of the winding apparatus 100, for example, facilitating the layout of the fifth image acquisition device 75, the fourth buffer mechanism 84, the fifth buffer mechanism 85, and the like, described later.

[0369] According to the connection relationship between the first diaphragm c, the second electrode b and the second diaphragm d in the fifth composite sheet j, the form of the fifth polymerization mechanism 35 can be designed accordingly.

[0370] Exemplarily, the fifth polymerization mechanism 35 is an edge sealing mechanism, and is used to seal and connect at least one of the two side edges of the first diaphragm c and the second diaphragm d in the width direction. Thus, the edge sealing mechanism can connect the edges of the first diaphragm c and the second diaphragm d together to achieve edge sealing. When the external force is removed, the first diaphragm c and the second diaphragm d will not separate, causing the second pole piece b to be exposed. During the winding process of the electrode assembly 200, the gap is not easy to fold, and it is not easy to be disturbed by the holes during the injection process. The risk of the second pole piece b overlapping the first pole piece a and the second pole piece b overlapping the shell 3011 of the battery cell 301 is effectively reduced, and the lithium plating problem is improved. For example, the edge sealing mechanism may include two edge sealing rollers arranged opposite to each other, and the two edge sealing rollers can heat the two side edges of the first diaphragm c and the second diaphragm d and apply a predetermined pressure along the thickness direction F1 to achieve the edge sealing connection of the first diaphragm c and the second diaphragm d.

[0371] Combined with Figure 14, when the fifth polymerization mechanism 35 is a sealing mechanism, the fifth composite sheet j is formed as a sheet body formed by the second pole piece b being sealed and wrapped by the first diaphragm c and the second diaphragm d on both sides of the thickness direction F1, so that the relative position of the second pole piece b and the first diaphragm c and the second diaphragm d is stable, and can be synchronously transmitted to the first polymerization mechanism 31 without easily causing problems such as offset, folding of the first diaphragm c, folding of the second diaphragm d, and exposure of the second pole piece b. This is beneficial to improving the position accuracy of the second pole piece b during transmission and subsequent processes, and reducing the risk of overlap between the second pole piece b and the first pole piece a.

[0372] Exemplarily, the fifth polymerization mechanism 35 is a composite mechanism, and is used to securely connect the second electrode piece b in the fifth composite sheet j to the first and second diaphragms c and d, respectively. This reduces the displacement of the first electrode piece a relative to the first and second diaphragms c and d during winding and use, helping to improve the accuracy of the relative positions of the various materials, thereby enhancing product quality. The method of secure connection is not limited, and may be achieved through cold pressing, hot pressing, gluing, or other methods. Furthermore, the location of secure connection is not limited and may be the entire surface or a localized area, such as a central area or an edge area.

[0373] For example, when the fifth polymerization mechanism 35 is a composite mechanism, the second electrode piece b can be pressed between the first diaphragm c and the second diaphragm d by pressure, or the second electrode piece b can be attached to the first diaphragm c and the second diaphragm d by gluing or other means. For example, the fifth polymerization mechanism 35 can include two rollers spaced apart from each other, or a single roller and a support spaced apart from the roller, or multiple rollers or other structures. The roller in the fifth polymerization mechanism 35 can be rotatable, fixed, or floating. The roller in the fifth polymerization mechanism 35 can also be an active roller or a passive roller.

[0374] In some embodiments, referring to Figures 12 and 13 , the fifth polymerization mechanism 35 includes a first composite roller 351 and a second composite roller 352. Composite roller 351 and second composite roller 352 rotate in opposite directions. Composite roller 351 and second composite roller 352 cooperate to roll and press together the second separator d, the second electrode piece b, and the first separator c.

[0375] With reference to Figures 12 and 13, both the fifth composite roller 351 and the fifth composite roller 352 are roller-shaped structures. The fifth composite roller 351 and the fifth composite roller 352 are arranged in parallel. Specifically, the central axis of the fifth composite roller 351 and the central axis of the fifth composite roller 352 are arranged parallel to each other, and the rotation direction of the fifth composite roller 351 and the rotation direction of the fifth composite roller 352 are opposite. The fifth composite roller 351 and the fifth composite roller 352 are spaced apart to form a fifth composite gap 353.

[0376] 12 and 13 , the first composite roller 351 of the fifth mechanism and the second composite roller 352 of the fifth mechanism are spaced apart along the second direction F6 to form the fifth composite gap 353 .

[0377] Based on the above structure, the second diaphragm d, the second electrode piece b, and the first diaphragm c can pass through the fifth composite gap 353 and be rolled by the composite roller 1 351 and the composite roller 2 352 of the mechanism 5 to form the fifth composite sheet j. This arrangement can achieve the composite effect of the fifth polymerization mechanism 35.

[0378] Among them, according to the connection relationship between the first diaphragm c, the second pole piece b and the second diaphragm d in the fifth composite sheet j, the rolling position and rolling pressure of the composite roller 1 351 of mechanism five and the composite roller 2 352 of mechanism five can be specifically designed to meet the requirements of only stacking without connection, or composite fixed connection, or edge sealing connection.

[0379] In some embodiments, referring to FIG12 and FIG13 , when the winding apparatus 100 includes the fifth aggregation mechanism 35, the type of the first aggregation mechanism 31 is not limited. For example, the first aggregation mechanism 31 may be a composite mechanism that is used to securely connect the fifth composite sheet j and the first pole piece a. Alternatively, the first aggregation mechanism 31 may be a mechanism that is used to simply stack the fifth composite sheet j and the first pole piece a together without connecting them.

[0380] When the first polymerization mechanism 31 is a composite mechanism and is used to securely connect the fifth composite sheet j and the first electrode sheet a, it can reduce the offset of the first electrode sheet a relative to the fifth composite sheet j during winding and use, thereby improving the accuracy of the relative positions of the materials and thus enhancing product quality. The method of secure connection is not limited, and for example, cold pressing, hot pressing, gluing, etc. can be used. Furthermore, the location of the secure connection is not limited and can be the entire surface or a portion, such as a portion in the center or a portion at the edge.

[0381] In some embodiments, referring to Figures 12 and 13 , the first polymerization mechanism 31 includes a first composite roller 311 and a second composite roller 312. Composite roller 311 and composite roller 312 rotate in opposite directions. Composite roller 311 and composite roller 312 cooperate to roll together to composite the first electrode sheet a and the fifth composite sheet j. Both composite roller 311 and composite roller 312 are roller-shaped structures.

[0382] The first composite roller 311 and the second composite roller 312 are arranged in parallel. Specifically, the central axis of the first composite roller 311 and the central axis of the second composite roller 312 are arranged in parallel, and the rotation direction of the first composite roller 311 and the rotation direction of the second composite roller 312 are opposite. The first composite roller 311 and the second composite roller 312 are spaced apart to form a first composite gap 313.

[0383] The first composite roller 311 of the mechanism 1 and the second composite roller 312 of the mechanism 1 are spaced apart along the second direction F6 to form the first composite gap 313 .

[0384] Based on the above structure, the first electrode piece a and the fifth composite piece j can pass through the first composite gap 313 and be rolled by the first composite roller 311 and the second composite roller 312 to form the first composite piece e. This arrangement can achieve the composite effect of the first polymerization mechanism 31.

[0385] Among them, according to the connection relationship between the first pole piece a and the fifth composite piece j in the first composite piece e, the rolling position and rolling pressure of the composite roller 1 311 of mechanism 1 and the composite roller 2 312 of mechanism 1 can be specifically designed to meet the requirements of only stacking without connection, or composite fixed connection.

[0386] In conjunction with Figures 11 and 12 , in some embodiments, when the winding apparatus 100 includes the fifth aggregating mechanism 35, the winding apparatus 100 may further include a fifth detection device, comprising a fifth image acquisition device 75. The fifth image acquisition device 75 is located between the fifth aggregating mechanism 35 and the first aggregating mechanism 31 and is configured to detect the fifth composite sheet j. The fifth image acquisition device 75 may be communicatively connected to the processor 702. Alternatively, the fifth detection device may comprise a separate processor that is communicatively connected to the fifth image acquisition device 75.

[0387] It is worth noting that "the fifth image acquisition device 75 is located between the fifth aggregation mechanism 35 and the first aggregation mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the fifth image acquisition device 75, the fifth aggregation mechanism 35, and the first aggregation mechanism 31 are not limited), but a restriction on the order of the workstations, that is, the fifth composite sheet j formed by the aggregation of the fifth aggregation mechanism 35 can first be inspected by the fifth image acquisition device 75 before entering the first aggregation mechanism 31.

[0388] The fifth image acquisition device 75 may be, but is not limited to, a CCD (charge coupled device) camera. Exemplarily, the fifth image acquisition device 75 may include a camera, a machine vision detection device, or other structures. Exemplarily, the fifth image acquisition device 75 may also include other components, such as a control device. The fifth image acquisition device 75 can capture image information (e.g., position, color, shape, etc.) relative to the fifth composite sheet j, convert this image information into a digital signal, and transmit it to the control device, so that the control device can determine whether the fifth composite sheet j meets the requirements according to a preset program.

[0389] 11 and 12 , by disposing a fifth image acquisition device 75 between the fifth aggregation mechanism 35 and the first aggregation mechanism 31 , the fifth composite sheet j can be inspected, thereby obtaining the quality of the fifth composite sheet j.

[0390] Among them, the fifth image acquisition device 75 can detect the fifth composite sheet j, so as to obtain the polymerization status of the first diaphragm a, the second electrode sheet b, and the second diaphragm c, so as to strictly control the quality of the fifth composite sheet j, which can help improve the quality of the electrode assembly 200.

[0391] For example, in conjunction with Figures 11 and 12 , the fifth image acquisition device 75 can be used to detect the relative position of the first diaphragm c and the second electrode piece b in the fifth composite sheet j. Thus, the fifth image acquisition device 75 can detect the OH of the first diaphragm c exceeding the second electrode piece b. "OH of the first diaphragm c exceeding the second electrode piece b" refers to the extent to which the edge of the first diaphragm c extends beyond the active material area of ​​the second electrode piece b in the width direction of the electrode piece. An OH defect means that the dimension of the excess portion does not meet the required size range. This allows the first diaphragm c to provide a relatively reliable insulation between the second electrode piece b and the first electrode piece a.

[0392] For example, a fifth image acquisition device 75 is provided on one or both sides of the fifth composite sheet j in the thickness direction F1 to detect defects and other information within the fifth composite sheet j. The fifth image acquisition device 75 can sequentially inspect multiple locations along the length of the material while the material is in motion, or can continuously inspect the material along its length.

[0393] For example, referring to Figures 11 and 12 , when the fifth aggregation mechanism 35 is a composite mechanism, the fifth image acquisition device 75 is positioned downstream of the fifth aggregation mechanism 35 and is capable of detecting the composite state of the fifth composite sheet j. For example, composite defects such as corner folding and damage of the second electrode sheet b can be detected.

[0394] For example, referring to Figures 11 and 12 , when the fifth aggregation mechanism 35 is an edge-sealing mechanism, the fifth image acquisition device 75 can be used to detect the edge-sealing status of the fifth composite sheet j. After edge-sealing, the fifth composite sheet j can be transferred to the fifth image acquisition device 75, where the fifth image acquisition device 75 can be used to inspect the edge-sealing status of the formed sheet. For example, edge-sealing defects such as the folded corners of the second electrode sheet b, wrinkles in the first and second diaphragms c and d, edge-sealing failure, edge-sealing misalignment, edge-sealing dimensions, and grayscale differences can be inspected. For example, the width and position of the edge-sealing along the width direction F2 of the first and second diaphragms c and d can be inspected. Based on the inspection results, the first and second diaphragms c and d and the edge-sealing mechanism can be adjusted to ensure that the width of the formed edge-sealing is 0.5 mm to 1 mm, and that the edge-sealing is located approximately in the middle of the portion where the first and second diaphragms c and d extend beyond the edge of the second electrode sheet b. This improves the reliability of the edge-sealing, ensuring that the first and second diaphragms c and d can reliably limit and protect the second electrode sheet b.

[0395] When the fifth aggregation mechanism 35 is an edge-sealing mechanism, the fifth image acquisition device 75 is used to detect the relative positions of the first diaphragm c, the second diaphragm d, and the second electrode piece b. For example, the fifth image acquisition device 75 can also detect the OH of the first diaphragm c and the second diaphragm d exceeding the second electrode piece b. "The OH of the first diaphragm c and the second diaphragm d exceeding the second electrode piece b" refers to the size of the first diaphragm c edge exceeding the active material area edge of the second electrode piece b, and the size of the second diaphragm d edge exceeding the active material area edge of the second electrode piece b, in the width direction of the electrode piece.

[0396] Therefore, the fifth image acquisition device 75 can detect whether the relative positions of the second pole piece b and the first diaphragm c and the second diaphragm d are accurate, thereby improving the position accuracy of the first diaphragm c, the second diaphragm d and the second pole piece b. The two sides of the first diaphragm c and the second diaphragm d in the width direction F2 can exceed the edge of the second pole piece b by a sufficient size, thereby improving the edge sealing effect and reducing the risk of overlap between the second pole piece b and the first pole piece a.

[0397] Exemplarily, when the fifth polymerization mechanism 35 is an edge-sealing mechanism and the first polymerization mechanism 31 is a laminating mechanism, the edge-sealing mechanism is located upstream of the laminating mechanism. The edge-sealing mechanism is used to seal the second electrode sheet b with the first and second separators c and d to form a fifth composite sheet j. After the fifth composite sheet j is transferred to the laminating mechanism, the laminating mechanism can attach the first electrode sheet a to one side of the fifth composite sheet j and laminate them to form the unwound electrode assembly 200.

[0398] At this time, the first image acquisition device 71 is also used to detect the relative position of the second electrode piece b and the first electrode piece a. After the fifth composite piece j and the first electrode piece a are stacked and composited, the relative position of the second electrode piece b and the first electrode piece a of the resulting electrode assembly 200 is accurate, for example, the width of the second electrode piece b is required to extend beyond the edge of the first electrode piece a by a certain distance on both sides, thereby reducing the risk of OH leakage and effectively solving the lithium plating problem.

[0399] For example, the fifth image acquisition device 75 may adopt a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different image acquisition devices may be the same or different. For example, the fifth image acquisition device 75 may include a CCD. The CCD is capable of acquiring an optical image of the material, thereby realizing detection. Furthermore, the CCD is also capable of converting the optical image into a digital signal so as to analyze, process and store the optical image. For example, the fifth image acquisition device 75 may include an X-ray camera, which is capable of penetrating the first diaphragm c and the second diaphragm d to detect the position of the second pole piece b located in the inner layer. The X-ray camera has high resolution and can penetrate objects for detection, thereby improving detection accuracy.

[0400] In some embodiments, in combination with Figures 11 and 12, when the winding device 100 includes a fifth polymerization mechanism 35, the winding device 100 may also include: a fourth cache mechanism 84, the fourth cache mechanism 84 is arranged between the fifth polymerization mechanism 35 and the first polymerization mechanism 31, and is used to cache the fifth composite sheet j.

[0401] In some embodiments, referring to FIG12 , the fourth buffer mechanism 84 is disposed between the fifth aggregation mechanism 35 and the first aggregation mechanism 31 and is used to buffer the fifth composite sheet j. Since the fourth buffer mechanism 84 is disposed between the fifth aggregation mechanism 35 and the first aggregation mechanism 31 and is used to buffer the fifth composite sheet j, the fourth buffer mechanism 84 can buffer the fifth composite sheet j located between the fifth aggregation mechanism 35 and the first aggregation mechanism 31.

[0402] Therefore, the fourth cache mechanism 84 can cache the fifth composite sheet j. When there is a speed difference before and after the fourth cache mechanism 84, the fourth cache mechanism 84 can cache and release part of the fifth composite sheet j in time, thereby solving the speed reduction problem or the wrinkle problem caused by insufficient tension, and improving production capacity and product quality.

[0403] In some embodiments, in combination with FIG. 11 and FIG. 12 , when the winding device 100 includes the fourth buffer mechanism 84 , the second cutting mechanism 62 for cutting the second pole piece b may be provided between the second feeding mechanism 12 and the fifth aggregation mechanism 35 .

[0404] It is worth noting that "the second cutting mechanism 62 is arranged between the second feeding mechanism 12 and the fifth aggregation mechanism 35" is not a restriction on the spatial position (that is, in space, the relative positions of the second cutting mechanism 62, the second feeding mechanism 12, and the fifth aggregation mechanism 35 are not limited), but a restriction on the order of the work stations, that is, the second electrode b output by the second feeding mechanism 12 can be cut off by the second cutting mechanism 62 before entering the fifth aggregation mechanism 35.

[0405] In this way, when the second cutting mechanism 62 needs to slow down to cut the second electrode sheet b, the fourth buffer mechanism 84 can release the buffered fifth composite sheet j to supply to the first aggregation mechanism 31, allowing the first aggregation mechanism 31 to continuously and uninterruptedly combine the fifth composite sheet j with the first electrode sheet a to form the first composite sheet e without stopping. This in turn allows the winding mechanism 40 to continuously and uninterruptedly wind the first composite sheet e without stopping. In this way, the winding efficiency of the winding device 100 can be improved, thereby improving the production efficiency of the electrode assembly.

[0406] Moreover, the second cutting mechanism 62 can be arranged spatially away from the winding mechanism 40 to solve the adverse effect on the quality of the electrode assembly 200 caused by chips formed by cutting falling into the electrode assembly 200 wound on the winding needle 42, thereby helping to further improve the quality of the electrode assembly 200.

[0407] For example, the tape feeding of the second electrode sheet b can be stopped, that is, the first feeding mechanism 11 can stop the reeling and unreeling operation of the second electrode sheet b and cut the second electrode sheet b, thereby ensuring the cutting operation of the second electrode sheet b to a certain extent. In addition, when the tape feeding of the second electrode sheet b stops and the cutting operation is performed, because the fourth buffer mechanism 84 buffers the fifth composite sheet j located between the fifth polymerization mechanism 35 and the first polymerization mechanism 31, the first polymerization mechanism 31 can continuously and uninterruptedly combine the fifth composite sheet j and the first electrode sheet a to form the first composite sheet e without stopping, thereby allowing the winding mechanism 40 to continuously and uninterruptedly wind the first composite sheet e without stopping. In this way, the winding efficiency of the winding device 100 can be improved, thereby improving the production efficiency of the electrode assembly.

[0408] In some embodiments, referring to FIG12 , the fourth buffer mechanism 84 may include a fourth floating roller 842 and a plurality of fourth fixed rollers 841. The fourth floating rollers 842 and the fourth fixed rollers 841 are configured to alternately pass around the fifth composite sheet j. The fourth floating rollers 842 are movable relative to the fourth fixed rollers 841 to buffer the fifth composite sheet j. The fourth fixed rollers 841 are rotatable, fixed pulleys. The fourth floating rollers 842 are rotatable, flexible pulleys. There may be at least one fourth floating roller 842.

[0409] The fourth floating roller 842 and the fourth fixed roller 841 are used to alternately pass around the fifth composite sheet j, meaning that the fifth composite sheet j can alternately pass around the fourth floating roller 842 and the fourth fixed roller 841. For example, if there are two fourth fixed rollers 841 and one fourth floating roller 842, the fifth composite sheet j can sequentially pass around one of the fourth fixed rollers 841, the fourth floating roller 842, and the other fourth fixed roller 841. For example, if there are three fourth fixed rollers 841 and two fourth floating rollers 842, as shown in Figures 2 and 3, the fifth composite sheet j can sequentially pass around the first fourth fixed roller 841, the first fourth floating roller 842, the second fourth fixed roller 841, the second fourth floating roller 842, and the third fourth fixed roller 841.

[0410] Multiple fourth fixed rollers 841 are spaced apart along the first direction F5. A fourth floating roller 842 is provided between two adjacent fourth fixed rollers 841 in the first direction F5. Furthermore, the fourth fixed rollers 841 and the fourth floating rollers 842 are spaced apart along the second direction F6. The fifth composite sheet j alternately passes around the fourth fixed rollers 841 and the fourth floating rollers 842 and is pulled to the first aggregation mechanism 31. When the second pole piece b stops running for cutting, the fourth floating roller 842 can move toward the fourth fixed roller 841 along the second direction F6 to shorten the distance between the fourth fixed roller 841 and the fourth floating roller 842, allowing the first aggregation mechanism 31 to continuously and uninterruptedly composite the fifth composite sheet j into the first composite sheet e. Accordingly, the winding mechanism 40 can continuously and uninterruptedly wind the first composite sheet e.

[0411] By providing a fourth fixed roller 841 and a fourth floating roller 842 that can move relative to the fourth fixed roller 841, and the fourth fixed roller 841 and the fourth floating roller 842 can alternately bypass the fifth composite sheet j, a caching effect can be achieved for the fifth composite sheet j.

[0412] It should be noted that the length of the fifth composite sheet j that can be cached by the fourth buffer mechanism 84 can be adjusted by adjusting the number of the fourth floating rollers 842 and the distance between the fourth floating rollers 842 and the fourth fixed roller 841 .

[0413] When the winding apparatus 100 includes the fourth buffer mechanism 84, the fifth image acquisition device 75 can be disposed between the fifth polymerization mechanism 35 and the fourth buffer mechanism 84; alternatively, the fifth image acquisition device 75 can be disposed between the fourth buffer mechanism 84 and the first polymerization mechanism 31. When the fifth image acquisition device 75 is disposed between the fourth buffer mechanism 84 and the first polymerization mechanism 31, defects generated in the fifth composite sheet j during the polymerization process and the buffering process can be detected by the fifth image acquisition device 75, thereby improving the quality of the electrode assembly 200 produced.

[0414] 11 and 12 , in some embodiments, when the winding device 100 includes a fifth polymerization mechanism 35 , the winding device 100 may further include: a fifth cache mechanism 85 , which is disposed between the first polymerization mechanism 31 and the winding mechanism 40 and is used to cache the first composite sheet e.

[0415] In this way, the fifth cache mechanism 85 can cache the first composite sheet e located between the first polymerization mechanism 31 and the winding mechanism 40. When there is a speed difference before and after the fifth cache mechanism 85, the fifth cache mechanism 85 can cache and release part of the first composite sheet e in time, thereby solving the speed reduction problem or the wrinkle problem caused by insufficient tension, and improving production capacity and product quality.

[0416] 11 and 12 , in some embodiments, when the winding device 100 includes the fifth buffer mechanism 85 , the first cutting mechanism 61 for cutting the first pole piece a may be provided between the first feeding mechanism 11 and the first aggregation mechanism 31 .

[0417] It is worth noting that "the first cutting mechanism 61 is arranged between the first feeding mechanism 11 and the first aggregation mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the first cutting mechanism 61, the first feeding mechanism 11, and the first aggregation mechanism 31 are not limited), but a restriction on the order of the work stations, that is, the first electrode a output by the first feeding mechanism 11 can be cut by the first cutting mechanism 61 before entering the first aggregation mechanism 31.

[0418] In this way, when the first cutting mechanism 61 needs to slow down to cut the first electrode sheet a, the fifth buffer mechanism 85 can release the buffered first composite sheet e to supply the winding mechanism 40, allowing the winding mechanism 40 to continuously and uninterruptedly wind the first composite sheet e without stopping. This improves the winding efficiency of the winding device 100 and thus the production efficiency of the electrode assembly. Furthermore, the first cutting mechanism 61 can be spatially located away from the winding mechanism 40, preventing the adverse effects of cutting chips falling onto the electrode assembly 200 being wound on the winding needle 42, thereby further improving the quality of the electrode assembly 200.

[0419] For example, the tape feeding of the second electrode sheet b and the first electrode sheet a can be stopped, that is, the first feeding mechanism 11 and the third feeding mechanism 21 can respectively stop the winding and unwinding operations of the first electrode sheet a and the second electrode sheet b, and cut the first electrode sheet a and the second electrode sheet b, thereby ensuring the cutting operation of the second electrode sheet b and the first electrode sheet a to a certain extent. In addition, during the process of stopping the tape feeding of the second electrode sheet b and the first electrode sheet a and performing the cutting operation, because the fifth buffer mechanism 85 buffers the first composite sheet e located between the first polymerization mechanism 31 and the winding mechanism 40, the winding mechanism 40 can continue to wind the first composite sheet e without stopping. In this way, the winding mechanism 40 can perform the winding operation without stopping, thereby improving the winding efficiency of the winding equipment 100 and improving the production efficiency of the electrode assembly.

[0420] In some embodiments, referring to FIG12 , the fifth buffer mechanism 85 may include a fifth floating roller 852 and a plurality of fifth fixed rollers 851. The fifth floating roller 852 and the fifth fixed roller 851 are configured to alternately pass around the first composite sheet e, and the fifth floating roller 852 is movable relative to the fifth fixed roller 851 to buffer the first composite sheet e.

[0421] The fifth fixed roller 851 is a pulley that can rotate and is fixed in position. The fifth floating roller 852 is a pulley that can rotate and is not fixed in position. There can be at least one fifth floating roller 852.

[0422] The fifth floating roller 852 and the fifth fixed roller 851 are used to alternately pass around the first composite sheet e. This means that the first composite sheet e can alternately pass around the fifth floating roller 852 and the fifth fixed roller 851. For example, if there are two fifth fixed rollers 851 and one fifth floating roller 852, the first composite sheet e can sequentially pass around one of the fifth fixed rollers 851, the fifth floating roller 852, and the other fifth fixed roller 851.

[0423] Taking the example that there are three fifth fixed rollers 851 and two fifth floating rollers 852, the first composite sheet e can pass through the first fifth fixed roller 851, the first fifth floating roller 852, the second fifth fixed roller 851, the second fifth floating roller 852 and the third fifth fixed roller 851 in sequence.

[0424] Multiple fifth fixed rollers 851 are spaced apart along the first direction F5. A fifth floating roller 852 is provided between two adjacent fifth fixed rollers 851 in the first direction F5. Furthermore, the fifth fixed rollers 851 and the fifth floating rollers 852 are spaced apart along the second direction F6. The first composite sheet e alternately passes around the fifth fixed rollers 851 and the fifth floating rollers 852 and is pulled to the winding mechanism 40. When at least one of the second pole piece b and the first pole piece a stops running for cutting, the fifth floating roller 852 can move along the second direction F6 toward the fifth fixed roller 851 to shorten the distance between the fifth fixed roller 851 and the fifth floating roller 852, allowing the winding mechanism 40 to continuously and uninterruptedly wind the first composite sheet e. The first direction F5 and the second direction F6 are perpendicular.

[0425] By providing a fifth fixed roller 851 and a fifth floating roller 852 that can move relative to the fifth fixed roller 851, and the fifth fixed roller 851 and the fifth floating roller 852 can alternately bypass the first composite sheet e, a buffering effect can be achieved for the first composite sheet e.

[0426] It should be noted that the length of the first composite sheet e that can be cached by the fifth buffer mechanism 85 can be adjusted by adjusting the number of the fifth floating rollers 852 and the distance between the fifth floating rollers 852 and the fifth fixed roller 851 .

[0427] When the winding apparatus 100 includes the fifth buffer mechanism 85, the first image acquisition device 71 can be positioned between the fifth buffer mechanism 85 and the first polymerization mechanism 31; alternatively, the first image acquisition device 71 can be positioned between the fifth buffer mechanism 85 and the winding mechanism 40. When the first image acquisition device 71 is positioned between the fifth buffer mechanism 85 and the winding mechanism 40, defects in the first composite sheet e generated during the polymerization process and the buffering process can be detected by the first image acquisition device 71, thereby improving the quality of the electrode assembly 200 produced.

[0428] For example, referring to Figures 12 and 13 , when the fourth feeding mechanism 22 is positioned upstream of the first polymerization mechanism 31 so that the second separator d is also polymerized into the first composite sheet e, and when the winding apparatus 100 includes a fifth polymerization mechanism 35 , the third cutting mechanism 63 can be positioned between the first polymerization mechanism 31 and the winding mechanism 40 to separate the second separator d from the first separator c. This makes it easier to make the separator length longer than the electrode sheet, thereby meeting the design requirements of the electrode assembly 200. Furthermore, only one third cutting mechanism 63 is required, simplifying the equipment, reducing costs, and conserving space. For example, referring to Figures 12 and 13 , when the winding apparatus 100 includes a fifth buffer mechanism 85 , the third cutting mechanism 63 is specifically positioned between the fifth buffer mechanism 85 and the winding mechanism 40 .

[0429] With reference to FIG16 , in some embodiments, when the fourth feeding mechanism 22 is positioned upstream of the first aggregating mechanism 31, the winding apparatus 100 may further include a fourth aggregating mechanism 34. The fourth aggregating mechanism 34 is positioned upstream of the first aggregating mechanism 31 and downstream of the third feeding mechanism 21, the second feeding mechanism 12, and the first feeding mechanism 11. The fourth aggregating mechanism 34 is configured to aggregate the first electrode sheet a, the first separator c, and the second electrode sheet b into a seventh composite sheet m. The seventh composite sheet m and the second separator d are aggregated into a first composite sheet e via the first aggregating mechanism 31. The first image acquisition device 71 is positioned downstream of the first aggregating mechanism 31 and is configured to detect the first composite sheet e.

[0430] At this point, the first image acquisition device 71 can be used to detect the relative position of the second electrode piece b and the first electrode piece a. For example, the width of the second electrode piece b can be extended beyond the edge of the first electrode piece a by a certain distance on both sides, thereby reducing the risk of OH leakage and effectively solving the lithium deposition problem. Alternatively, the first image acquisition device 71 can also be used to detect OH in the diaphragm-encased electrode piece.

[0431] When the winding apparatus 100 includes the fourth convergence mechanism 34, the first convergence mechanism 31 may be an edge-sealing mechanism, configured to seal and connect at least one of the widthwise edges of the first and second diaphragms c and d. In this case, the first image acquisition device 71 may detect the edge-sealing status. Alternatively, the first convergence mechanism 31 may be a compounding mechanism, etc.

[0432] Of course, the present application is not limited to this. In other embodiments of the present application, the first composite sheet e may not include the second diaphragm d. For example, in conjunction with Figure 17, in some embodiments, the aggregation position of the second diaphragm d and the first composite sheet e is located downstream of the first image acquisition device 71.

[0433] The fourth feeding mechanism 22 is no longer disposed upstream of the first polymerization mechanism 31, so that the second diaphragm d released by the fourth feeding mechanism 22 cannot be conveyed to the first polymerization mechanism 31. For example, the fourth feeding mechanism 22 can convey the second diaphragm d between the first polymerization mechanism 31 and the winding mechanism 40; or, for another example, the fourth feeding mechanism 22 can convey the second diaphragm d directly to the winding mechanism 40.

[0434] Among them, the first polymerization mechanism 31 can polymerize the first electrode a, the first diaphragm c and the second electrode b at one time, or the first polymerization mechanism 31 can also polymerize the first electrode a, the first diaphragm c and the second electrode b in batches. For example, other polymerization mechanisms can be set upstream of the first polymerization mechanism 31 to first polymerize the first electrode a and the first diaphragm c, and then polymerize the second electrode b and the polymerized polymer sheet through the first polymerization mechanism 31 to form a first composite sheet e.

[0435] In the first composite sheet e, the first electrode piece a, the first diaphragm c and the second electrode piece b are stacked in sequence. After the first composite sheet e is formed, the first image acquisition device 71 can be used to inspect the first composite sheet e. The inspection items may include: whether the first diaphragm c can cover the first electrode piece a and the second electrode piece b, whether the first composite sheet e has head shaking or tail shaking problems, etc.

[0436] For example, in combination with Figure 17, the first image acquisition device 71 can be used to detect the state of the first electrode a in the first composite sheet e. The state of the first electrode a includes but is not limited to the width of the active material layer of the first electrode a, known defective electrode products (such as defective products with yellow labels), and electrode damage.

[0437] 17 , the first image acquisition device 71 can be used to detect the state of the first diaphragm c in the first composite sheet e, including but not limited to diaphragm folding, damage, etc. The state of the second electrode sheet b and the first diaphragm c.

[0438] For example, in combination with Figure 17, the first image acquisition device 71 can be used to detect the state of the second electrode b in the first composite sheet e. The state of the second electrode b includes but is not limited to the width of the active material layer of the second electrode b, known defective electrode products (such as defective products with yellow labels), electrode damage, etc.

[0439] For example, in combination with Figure 17, the first image acquisition device 71 can be used to detect the relative position relationship between the first electrode piece a and the first diaphragm c in the first composite piece e, including but not limited to the OH of the first diaphragm c wrapping the first electrode piece a, that is, the edge of the first diaphragm c exceeds the size of the edge of the first electrode piece a in at least one direction of the width direction F2 and the length direction F3. The defect of OH means that the size of the exceeding part does not meet the required size range.

[0440] For example, in combination with Figure 17, the first image acquisition device 71 can be used to detect the relative position relationship between the second electrode piece b and the first diaphragm c in the first composite piece e, including but not limited to the OH of the first diaphragm c wrapping the second electrode piece b, that is, the size of the edge of the first diaphragm c exceeds the edge of the second electrode piece b in at least one direction of the width direction F2 and the length direction F3. The defect of OH means that the size of the exceeding part does not meet the required size range.

[0441] Therefore, in combination with Figure 17, the first image acquisition device 71 can be used to detect whether the width of the active material layer of the first electrode piece a and the second electrode piece b in the first composite piece e meets the set range, and whether the first electrode piece a, the second electrode piece b and the first diaphragm c have defects such as composite defects such as compression so as to be discovered and eliminated in time; the first image acquisition device 71 can also detect whether the relative position of the second electrode piece b and the first diaphragm c is accurate, and whether the relative position of the first electrode piece a and the first diaphragm c is accurate, so as to facilitate subsequent processing and reduce the risk of overlap between the second electrode piece b and the first electrode piece a.

[0442] For example, the first image acquisition device 71 may include a camera, a machine vision detection device, or other structure. The camera may be, for example, a CCD camera. The first image acquisition device 71 may also include other components such as a controller. The first image acquisition device 71 can obtain image information (e.g., position, color, shape, etc.) of the relative electrode pieces, diaphragms, and first composite sheet e, and can convert this image information into digital signals and transmit them to the controller, so that the controller can determine whether the electrode pieces, diaphragms, and first composite sheet e meet requirements according to a preset program. For example, if the first composite sheet e can be transported straight, the first image acquisition device 71 can more comprehensively detect the status of the entire first composite sheet e passing through, and the detection results can be highly accurate.

[0443] In related art, winding equipment winds the electrode and diaphragm around a winding needle, making the head and tail of the electrode and diaphragm entering the winding needle difficult to detect by the detection device. In this embodiment, however, the winding equipment 100 includes a first image acquisition device 71 disposed between the first aggregation mechanism 31 and the winding mechanism 40. Positioning the first image acquisition device 71 upstream of the winding mechanism 40 enables more comprehensive inspection of the first composite sheet e, which is a three-in-one stack of the first electrode sheet a, the first diaphragm c, and the second electrode sheet b. This reduces detection blind spots and improves detection accuracy. Furthermore, because the first composite sheet e is a three-in-one stack of the first electrode sheet a, the first diaphragm c, and the second electrode sheet b, it facilitates early and accurate detection.

[0444] For example, with reference to FIG17 , the winding apparatus 100 includes a first polymerization mechanism 31, a fourth feeding mechanism 22, and a winding mechanism 40. The first polymerization mechanism 31 is used to press the first electrode sheet a, the first separator c, and the second electrode sheet b to form a first composite sheet e. The fourth feeding mechanism 22 is used to unwind the second separator d. The winding mechanism 40 is used to wind the first composite sheet e and the second separator d to form the electrode assembly 200. The first polymerization mechanism 31 first aggregates the first electrode sheet a, the first separator c, and the second electrode sheet b into a first composite sheet e, and then winds the first composite sheet e and the second separator d on the winding mechanism 40. The first polymerization mechanism 31 and the winding mechanism 40 of the winding apparatus 100 can be spaced apart, each of which can have a larger space. Furthermore, the winding apparatus 100 does not need to feed the cathode electrode sheet, the anode electrode sheet, and the separator separately to the winding mechanism 40, which solves the problem of crowded space above the winding mechanism 40, optimizes the layout of the winding apparatus 100, and facilitates flexible arrangement of various components. In addition, since the first polymerization mechanism 31 presses the first electrode piece a, the first diaphragm c and the second electrode piece b to form the first composite piece e, the first composite piece e can be fully inspected before entering the winding mechanism 40, thereby solving the problem of blind spots in the detection of the wound electrode assembly 200 at the winding mechanism 40.

[0445] In addition, both sides of the first composite sheet e are pole pieces. During the transmission of the first composite sheet e, the friction forces on both sides of the first composite sheet e along its thickness direction are consistent. When passing through the transmission roller, it is not easy for the roller to detach from the pole piece.

[0446] When the first composite sheet e does not include the second diaphragm d, the first electrode piece a and the first diaphragm c in the first composite sheet e may be in contact without being connected, or may be in contact and connected, that is, the first electrode piece a and the first diaphragm c are in a state of being connected or not connected. At the same time, the second electrode piece b and the first diaphragm c in the first composite sheet e may be in contact without being connected, or may be in contact and connected, that is, the second electrode piece b and the first diaphragm c are in a state of being connected or not connected.

[0447] In conjunction with Figure 17 , when the first composite sheet e does not include the second separator d, the unwinding of the second separator d is unaffected by upstream processes such as cutting and defect removal of the first composite sheet e. Continuous unwinding (i.e., uninterrupted unwinding) of the second separator d can be achieved as needed, allowing the second separator d to extend beyond the beginning and end of each electrode assembly 200's electrode sheet (e.g., on both sides of the electrode sheet in the longitudinal direction F3). This improves the effectiveness of the second separator d in separating the first electrode sheet a from the second electrode sheet b during winding of the electrode assembly 200, helping to reduce the risk of short circuits caused by overlapping of the second electrode sheet b and the first electrode sheet a. Furthermore, the second separators d of multiple electrode assemblies 200 can be connected during transport, improving transport stability and reducing deviation of the electrode assemblies 200 during production. Furthermore, the continuous unwinding of the second separator d eliminates the need for continuous unwinding of the first separator c. The unwinding of the second separator d alone allows the electrode sheets to extend beyond the beginning and end and connect multiple electrode assemblies 200, saving materials and achieving better economic efficiency.

[0448] Exemplarily, in conjunction with FIG17 , the first polymerization mechanism 31 is a composite mechanism, and is used to fix the first electrode piece a and the second electrode piece b in the first composite piece e to the first diaphragm c. This reduces the displacement of the first electrode piece a relative to the first diaphragm c, the displacement of the second electrode piece b relative to the first diaphragm c, and the displacement of the first electrode piece a relative to the second electrode piece b during winding and use, which is beneficial to improving the accuracy of the relative positions between the materials, thereby improving product quality. Among them, the method of fixed connection is not limited, for example, it can be connected by cold pressing, hot pressing, gluing, etc. In addition, the location of the fixed connection is not limited, and it can be the entire surface or a part, such as a part in the center, or a part at the edge, etc.

[0449] For example, when the first polymerization mechanism 31 is a composite mechanism, the first polymerization mechanism 31 can press the first electrode piece a and the second electrode piece b onto the first diaphragm c by pressure, or can adhere the first electrode piece a and the second electrode piece b to the first diaphragm c by applying glue or other means. For example, the first polymerization mechanism 31 can include two rollers spaced apart from each other, or a roller and a support spaced apart from the roller, or multiple rollers or other structures; the roller in the first polymerization mechanism 31 can be rotatable, fixed, or floating; and the roller in the first polymerization mechanism 31 can be either an active roller or a passive roller.

[0450] For example, in conjunction with Figure 17, when the first polymerization mechanism 31 is a composite mechanism, the first polymerization mechanism 31 is used to composite the first electrode piece a, the first diaphragm c, and the second electrode piece b to form a first composite piece e, wherein the first diaphragm c is located between the second electrode piece b and the first electrode piece a. The first polymerization mechanism 31 is arranged downstream of the first feeding mechanism 11, the third feeding mechanism 21, and the second feeding mechanism 12, so that the first electrode piece a, the first diaphragm c, and the second electrode piece b can be conveyed to the first polymerization mechanism 31 for composite formation to form the first composite piece e. The first polymerization mechanism 31 can composite the first electrode piece a with the side of the first diaphragm c facing away from the second electrode piece b, and composite the second electrode piece b with the side of the first diaphragm c facing away from the first electrode piece a, with the first diaphragm c located between the second electrode piece b and the first electrode piece a. In other words, the first electrode piece a, the first diaphragm c, and the second electrode piece b are connected together. This ensures that the relative positions of the first electrode piece a, the first diaphragm c and the second electrode piece b are fixed, and the first electrode piece a, the first diaphragm c and the second electrode piece b can be transported synchronously without being easily offset, which is beneficial to improving the position accuracy of the first electrode piece a and the second electrode piece b during the production process.

[0451] For example, in conjunction with Figure 17, when the first polymerization structure 31 is a composite structure, the first electrode a, the first diaphragm c and the second electrode b can be connected by heating, pressurizing, etc., and the viscosity of the first diaphragm c can be improved by adopting a first diaphragm c with a higher PVDF (polyvinylidene fluoride) content (for example, a content of 1 mg, 1.5 mg, 2 mg). For example, the PVDF content in the first diaphragm c is higher than the PVDF content in the second diaphragm d, so as to improve the connection tightness between the first diaphragm c and the first electrode a and the second electrode b respectively, reduce the displacement of the first electrode a relative to the first diaphragm c and the displacement of the second electrode b relative to the first diaphragm c during transportation, winding and use, which is beneficial to improve the accuracy of the relative positions between the materials.

[0452] For example, in combination with Figure 17, when the first polymerization mechanism 31 is a composite mechanism, the first polymerization mechanism 31 may include two composite rollers arranged opposite to each other, and the two composite rollers can heat the first electrode piece a, the first diaphragm c and the second electrode piece b and apply a predetermined pressure along the thickness direction F1 to make the first electrode piece a, the first diaphragm c and the second electrode piece b bonded together to achieve a composite connection of the first electrode piece a, the first diaphragm c and the second electrode piece b.

[0453] By way of example, with reference to FIG18 , when the first polymerization mechanism 31 is a composite mechanism, the first polymerization mechanism 31 includes two opposing composite rollers. When the first electrode piece a, the first diaphragm c, and the second electrode piece b are conveyed between the two composite rollers, the two composite rollers press the first electrode piece a, the first diaphragm c, and the second electrode piece b together. That is, the two composite rollers cooperate to apply a certain pressure to the first electrode piece a, the first diaphragm c, and the second electrode piece b, so that the first electrode piece a, the first diaphragm c, and the second electrode piece b are composited to form a first composite sheet e. Both sides of the first diaphragm c are adhesive, and the first electrode piece a and the second electrode piece b are fixed together by the adhesive on the first diaphragm c, so that the first electrode piece a, the first diaphragm c, and the second electrode piece b are sequentially attached, and the relative positions of the first electrode piece a, the first diaphragm c, and the second electrode piece b are fixed and not easily moved relative to each other.

[0454] For example, with reference to FIG17 , when the first polymerization mechanism 31 is a composite mechanism, the first image acquisition device 71 is located downstream of the first polymerization mechanism 31. The first image acquisition device 71 can be used to detect the composite state of the first composite sheet e. Specifically, when the first polymerization mechanism 31 is a composite mechanism, the first image acquisition device 71 is located downstream of the first polymerization mechanism 31. This allows the first electrode sheet a, the first diaphragm c, and the second electrode sheet b, after being composited to form the first composite sheet e, to be conveyed to the first image acquisition device 71 for detection of the composite state. For example, composite defects such as folded corners, damage, crushing, and wrinkling of the electrode sheet and diaphragm can be detected.

[0455] For example, in conjunction with Figure 17, the first image acquisition device 71 can adopt a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different image acquisition devices can be the same or different. For example, the image acquisition device may include a CCD. The CCD can obtain an optical image of the material to achieve detection. Furthermore, the CCD can also convert the optical image into a digital signal so that the optical image can be analyzed, processed and stored. For example, the image acquisition device may include an X-ray camera. The X-ray camera has high resolution and can penetrate objects for detection, thereby improving detection accuracy.

[0456] In addition, referring to FIG17 , the first image acquisition device 71 can be positioned on one or both sides of the material thickness direction F1 as needed. For example, a first image acquisition device 71 can be positioned on both sides of the first composite sheet e in the thickness direction F1 to detect the relative position of the first electrode piece a and the second electrode piece b, as well as detect defects in the second electrode piece b and the first electrode piece a. The first image acquisition device 71 can sequentially inspect multiple locations along the length direction F3 of the material while the material is in motion, or it can continuously inspect the entire length direction F3.

[0457] Of course, the present application is not limited to this. In other embodiments of the present application, the first polymerization mechanism 31 is not limited to being a composite mechanism. For example, the first polymerization mechanism 31 can also be a mechanism for stacking the first electrode a, the second electrode b, and the first diaphragm c in the first composite sheet e together without connecting them.

[0458] In some embodiments, referring to FIG17 , since the first diaphragm c needs to be positioned between the first electrode piece a and the second electrode piece b, the third feeding mechanism 21 can be spatially positioned between the first feeding mechanism 11 and the second feeding mechanism 12, thereby making the spatial layout of the first aggregation mechanism 31 more reasonable. It is understood that the various feeding mechanisms and aggregation mechanisms can be flexibly arranged and are not limited to the above arrangement. For example, in the height direction of the winding apparatus 100, the first feeding mechanism 11, the third feeding mechanism 21, and the second feeding mechanism 12 are arranged sequentially from top to bottom, so that the first electrode piece a, the first diaphragm c, and the second electrode piece b are stacked from top to bottom.

[0459] In conjunction with Figure 17, when the first composite sheet e does not include the second diaphragm d, in some embodiments, the winding device 100 may further include: a sixth polymerization mechanism 36, the sixth polymerization mechanism 36 is located between the first polymerization mechanism 31 and the winding mechanism 40, the fourth feeding mechanism 22 is located upstream of the sixth polymerization mechanism 36, and the sixth polymerization mechanism 36 is used to polymerize the first composite sheet e and the second diaphragm d into a sixth composite sheet k.

[0460] It is worth noting that "the sixth polymerization mechanism 36 is located between the first polymerization mechanism 31 and the winding mechanism 40" is not a restriction on the spatial position (that is, in space, the relative positions of the sixth polymerization mechanism 36, the first polymerization mechanism 31, and the winding mechanism 40 are not limited), but a restriction on the order of the work stations, that is, the first composite sheet e formed by the polymerization of the first polymerization mechanism 31 needs to be transported to the sixth polymerization mechanism 36 to participate in polymerization before entering the winding mechanism 40.

[0461] The fourth feeding mechanism 22 is disposed upstream of the sixth polymerization mechanism 36, so that the second diaphragm d released by the fourth feeding mechanism 22 can be conveyed to the sixth polymerization mechanism 36, so that the second diaphragm d can serve as the input material for the sixth polymerization mechanism 36. Thus, the sixth polymerization mechanism can aggregate the first composite sheet e conveyed by the first polymerization mechanism 31 and the second diaphragm d conveyed by the fourth feeding mechanism 22 into a sixth composite sheet k.

[0462] Thus, by providing the sixth polymerization mechanism 36 downstream of the first polymerization mechanism 31, the second separator d provided by the sixth polymerization mechanism 36 can be first polymerized with the first composite sheet e before being fed together into the winding mechanism 40. This ensures that the relative position of the second separator d and the sixth composite sheet k is more secure and less likely to shift, thereby improving the reliability of the second separator d insulating the first electrode sheet a from the second electrode sheet b in the wound electrode assembly 200. Furthermore, by spacing the sixth polymerization mechanism 36 from the winding mechanism 40, congestion around (e.g., above) the winding mechanism 40 can be avoided. Furthermore, the winding apparatus 100 separates the unwinding mechanisms from the winding mechanism 40, resulting in a flexible and convenient layout.

[0463] When the winding device 100 includes the sixth polymerization mechanism 36, in some embodiments, in conjunction with Figure 17, the sixth polymerization mechanism 36 is an edge sealing mechanism, and is used to seal and connect the edges of both sides of the first diaphragm c and the second diaphragm d in the width direction.

[0464] In conjunction with Figure 17 , when the sixth polymerization mechanism 36 is an edge-sealing mechanism, the sixth polymerization mechanism 36 is located downstream of the first polymerization mechanism 31 and the fourth feeding mechanism 22 and is used to seal the edge of the second diaphragm d with the first diaphragm c of the first composite sheet e to obtain the sixth composite sheet k. For example, the connection between the second diaphragm d and the first diaphragm c in the first composite sheet e can be achieved by heating, pressurizing, gluing, etc. The winding mechanism 40 is located downstream of the sixth polymerization mechanism 36 and is used to wind the sixth composite sheet k. This helps reduce the risk of short circuits caused by overlapping the second pole piece b and the first pole piece a, and reduces the risk of corrosion and leakage caused by overlapping the second pole piece b and the housing 3011 of the battery cell 301.

[0465] In some embodiments, in combination with Figure 17, when the sixth polymerization mechanism 36 is an edge sealing mechanism, the sixth polymerization mechanism 36 includes four edge sealing rollers arranged opposite to each other. The four edge sealing rollers can heat the four side edges of the diaphragm and apply a predetermined pressure along the thickness direction F1 to achieve edge sealing connection of the two layers of diaphragms.

[0466] During edge sealing, referring to Figure 17 , when the sixth aggregation mechanism 36 is an edge sealing mechanism, the portion where the two membrane layers meet constitutes the edge seal. Depending on practical needs, the edge seals along the width direction F2 of the two membrane layers can extend continuously or discontinuously along the material conveying direction, all of which are within the scope of protection of this application.

[0467] In some related technologies, the electrode and the diaphragm are tightly fitted by a fitting roller before winding. Here, no connection is formed between the materials and the diaphragms, but only a fitting contact relationship. After the external force is removed, it is easy to separate from each other, and there is a risk of overlapping of the anode electrode and the cathode electrode.

[0468] In some embodiments of the present application, combined with Figure 17, when the first polymerization mechanism 31 is a composite mechanism and the sixth polymerization mechanism 36 is an edge sealing mechanism, the first polymerization mechanism 31 is used to composite the first electrode piece a, the first diaphragm c and the second electrode piece b to form a tightly connected first composite piece e, and the sixth polymerization mechanism 36 is used to connect the edges of the first diaphragm c and the second diaphragm d together to achieve edge sealing. Even if the external force is removed, the first electrode piece a, the first diaphragm c and the second electrode piece b are not easy to separate, and the first diaphragm c and the second diaphragm d will not separate to expose the second electrode piece b. The diaphragm is not easy to fold during the winding process of the electrode assembly 200, and is not easily disturbed by holes during the injection process. The risk of the second electrode piece b overlapping the first electrode piece a and the second electrode piece b overlapping the shell 3011 of the battery cell 301 is effectively reduced, and the lithium plating problem is improved.

[0469] In addition, when the sixth polymerization mechanism 36 is an edge sealing mechanism, the detection of the first composite sheet e by the first image acquisition device 71 is conducive to ensuring that the first diaphragm c has sufficient edge to be edge sealed with the second diaphragm d, thereby improving the edge sealing quality.

[0470] Of course, the present application is not limited to this. The sixth polymerization mechanism 36 may not be an edge sealing mechanism. For example, with reference to FIG18 , the sixth polymerization mechanism 36 may simply be a conveyor roller. The fourth feeding mechanism 22 is used to unwind the second separator d. The sixth polymerization mechanism 36 is used to allow the second separator d to merge with the first composite sheet e to form a superimposed sheet, and then convey the superimposed sheet to the winding mechanism 40. The sixth polymerization mechanism 36 is used to allow the first composite sheet e and the second separator d to merge, so that the first composite sheet e and the second separator d can be stacked and formed into a superimposed sheet. The superimposed sheet is then conveyed to the winding mechanism 40 for winding. This simplifies the mechanism.

[0471] In conjunction with Figures 17 and 18 , when the winding apparatus 100 includes the sixth aggregating mechanism 36, in some embodiments, the winding apparatus 100 further includes a sixth detection device, which includes a sixth image acquisition device 76. The sixth image acquisition device 76 is located between the sixth aggregating mechanism 36 and the winding mechanism 40 and is configured to detect the sixth composite sheet k. The sixth image acquisition device 76 may be communicatively connected to the processor 702, or the sixth detection device may comprise a separate processor that is communicatively connected to the sixth image acquisition device 76.

[0472] It is worth noting that "the sixth image acquisition device 76 is located between the sixth polymerization mechanism 36 and the winding mechanism 40" is not a restriction on the spatial position (that is, in space, the relative positions of the sixth image acquisition device 76, the sixth polymerization mechanism 36, and the winding mechanism 40 are not limited), but a restriction on the order of the work stations, that is, the sixth composite sheet k formed by the polymerization of the sixth polymerization mechanism 36 can first be inspected by the sixth image acquisition device 76 before entering the winding mechanism 40.

[0473] Exemplarily, the sixth image acquisition device 76 may include a camera, a machine vision detection device, or other structure. The camera may be a CCD camera, etc. The sixth image acquisition device 76 may also include other components such as a controller. The sixth image acquisition device 76 can capture image information (e.g., position, color, shape, etc.) of the sixth composite sheet k, convert this image information into a digital signal, and transmit it to the controller. This allows the controller to determine, according to a preset program, whether the sixth composite sheet k meets requirements, such as whether the second diaphragm d is misaligned and whether the second diaphragm d can cover the first electrode sheet a and the second electrode sheet b. By adopting the above technical solution, the sixth image acquisition device 76 is disposed between the sixth polymerization mechanism 36 and the winding mechanism 40, enabling comprehensive detection of the sixth composite sheet k, resulting in highly accurate detection results.

[0474] The sixth image acquisition device 76 may include a linear array camera or an area array camera, wherein the image acquisition range of the linear array camera is larger, for example, a linear array camera may be centered on both sides of the material thickness direction F1; the image acquisition range of the area array camera is smaller, for example, an area array camera may be set at both ends of the pole piece on one side of the material thickness direction F1.

[0475] For example, the sixth image acquisition device 76 can be used to detect the relative position of the second diaphragm d and the second electrode piece b, such as detecting the OH of the second diaphragm d enclosing the second electrode piece b, i.e., the extent to which the edge of the second diaphragm d extends beyond the edge of the first electrode piece a in both the width direction F2 and the length direction F3. An OH defect means that the dimensions of the extending portion do not meet the required dimensional range. Furthermore, in some embodiments, the sixth image acquisition device 76 can also be used to detect the relative position of the first electrode piece a and the second electrode piece b, the relative position of the first diaphragm c and the first electrode piece a, and the like.

[0476] As shown in FIG17 , when the sixth polymerization mechanism 36 is an edge-sealing mechanism, the sixth image acquisition device 76 can be used to inspect the edge-sealing status of the sixth composite sheet k. For example, it can detect edge-sealing defects such as electrode sheet folds, wrinkles at the head and tail, and separator misalignment. For example, the relative position of the edge-sealing formed by the first and second separators c and d and the second electrode sheet b can be detected. Based on the detection results, the separators and the sixth polymerization mechanism 36 can be adjusted to ensure that the width and position of the edge-sealing meet the requirements for the separator to wrap around the second electrode sheet b, thereby improving the reliability of the edge-sealing and enabling the separator to reliably limit and protect the second electrode sheet b. Thus, by inspecting the edge-sealing status of the first, first, second, and second separators a, c, b, and d after they are stacked and edge-sealed to form the electrode assembly 200, the sixth image acquisition device 76 can achieve more comprehensive inspection, improve the reliability of the edge-sealing connection, and reduce the risk of missed defects during the production of the electrode assembly 200. This improves the positional accuracy of the first, first, second, and second separators a, c, b, and d.

[0477] In some embodiments, in conjunction with FIG17 , when the winding apparatus 100 includes a sixth polymerization mechanism 36 , the third cutting mechanism 63 can be disposed between the sixth polymerization mechanism 36 and the winding mechanism 40 . That is, the third cutting mechanism 63 cuts the first separator c and the second separator d after the sixth polymerization mechanism 36 aggregates the first composite sheet e and the second separator d into the sixth composite sheet k. This makes it easier to make the length of the separator greater than the length of the electrode sheet, thereby meeting the design requirements of the electrode assembly 200 . Furthermore, only one third cutting mechanism 63 is required, simplifying the equipment, reducing costs, and saving space. Furthermore, the winding apparatus 100 can cut the separator before or after the sixth composite sheet k is wound, eliminating the need for separate separator cutting time and improving overall winding efficiency.

[0478] 19 , when the third cutting mechanism 63 is disposed between the sixth polymerization mechanism 36 and the winding mechanism 40 , the winding device 100 further includes a first transmission member 91 disposed between the third cutting mechanism 63 and the winding mechanism 40 , and the first transmission member 91 is used to transfer the sixth composite sheet k to the winding mechanism 40 .

[0479] 19 , the sixth aggregation mechanism 36 is used to combine the second separator d with the first composite sheet e to form the sixth composite sheet k. The third cutting mechanism 63 is located upstream of the winding mechanism 40 and is capable of severing the first and second separators c and d before the sixth composite sheet k is wound. The third cutting mechanism 63 can include various cutting mechanisms, such as a linear cutter that reciprocates along a straight line, a cam cutter 81 that rotates about an axis, or a laser cutting mechanism. A first conveyor 91 transports the sixth composite sheet k from the third cutting mechanism 63 to the winding needle 42. The first conveyor 91 can include various conveying mechanisms, such as grippers and conveyor belts.

[0480] 19 , after the current winding needle 42 winds the electrode assembly 200 , the third cutting mechanism 63 cuts off the first diaphragm c and the second diaphragm d, and the first transmission member 91 transports the head of the next electrode assembly 200 to the unloaded winding needle 42 so that the winding needle 42 can wind the next electrode assembly 200 .

[0481] In conjunction with Figure 19, the third cutting mechanism 63 provided in the embodiment of the present application is arranged on the feed side of the winding mechanism 40, and uses the first transmission member 91 to transport the diaphragm or sheet to the winding mechanism 40, so that the winding mechanism 40 can wind the electrode assembly 200. By adopting the above technical solution, the third cutting mechanism 63 does not need to avoid the winding needle 42, which is conducive to simplifying the structure of the equipment; the winding device 100 can transport the membrane while cutting the membrane, which significantly improves the winding efficiency compared to the method of cutting the membrane first and then transporting the membrane.

[0482] 18 , in other embodiments, the first transmission member 91 may be omitted. For example, the third cutting mechanism 63 is adjacent to the winding station 4101 , and the cut film can be directly fixed and wound by the winding needle 42 .

[0483] 19 , in some embodiments, the first transmission member 91 is a vacuum adsorption transmission belt.

[0484] A vacuum transfer belt is a belt that can vacuum-hold a diaphragm. Connected to a vacuum pump, it features vacuum holes on its surface. These holes absorb the diaphragm, preventing it from warping or shifting during transport. In addition to holding the diaphragm, the belt can also absorb impurities such as debris and dust, minimizing any negative impacts on the diaphragm and the processing environment.

[0485] During operation, after the third cutting mechanism 63 cuts off the membrane, the first transmission member 91 transmits the head diaphragm of the electrode assembly 200 to the winding needle 42. For example, the head of the diaphragm falls vertically and enters the accommodating gap. The winding needle 42 can clamp the head diaphragm through the accommodating gap and then start winding. The first transmission member 91 can also transmit the tail diaphragm of the electrode assembly 200 to the winding needle 42, and then the tail diaphragm can be wound by the winding roller.

[0486] The first transmission member 91 of the embodiment of the present application is a vacuum adsorption transmission belt, which can improve the stability of the conveyed film and reduce the probability of the film being warped or deviated during the transmission process.

[0487] In some embodiments, as shown in FIG19 , the conveying speed of the vacuum conveyor belt is equal to the winding speed of the winding needle 42 at the winding station 4101. The winding speed of the winding needle 42 refers to the speed at which the winding needle 42 winds the electrode assembly 200 at the winding station 4101. This speed is the ratio of the length of the electrode assembly 200 to the winding time, representing the length of the membrane wound by the winding needle 42 per unit time. The conveying speed of the vacuum conveyor belt is the length of the membrane conveyed per unit time. By setting the conveying speed of the vacuum conveyor belt equal to the winding speed of the winding needle 42, the membrane tension can be kept at zero, reducing the probability of membrane deformation due to excessive tension. Furthermore, the vacuum conveyor belt has a faster conveying speed and higher transmission efficiency. It is understood that the conveying speed of the vacuum conveyor belt and the winding speed of the winding needle 42 can also be different, as long as the two are matched to maintain the membrane tension within a certain range.

[0488] 17 and 18 , in some embodiments, when the first composite sheet e does not include the second diaphragm d, the winding device 100 further includes a sixth cache mechanism 86 , which is disposed between the first polymerization mechanism 31 and the winding mechanism 40 and is used to cache the first composite sheet e.

[0489] In combination with Figures 17 and 18, the sixth cache mechanism 86 refers to a structure in the winding device 100 for temporarily storing the first composite sheet e. The sixth cache mechanism 86 can also release the cached first composite sheet e; the sixth cache mechanism 86 is arranged between the first polymerization mechanism 31 and the winding mechanism 40 for the first composite sheet e to be wound.

[0490] By adopting the above-described technical solution, the sixth buffer mechanism 86 can buffer and release the first composite sheet e, allowing the winding mechanism 40 to continuously receive material, thereby improving winding efficiency. For example, the sixth buffer mechanism 86 can buffer the first composite sheet e located between the first aggregation mechanism 31 and the winding mechanism 40. When there is a speed differential between the front and rear ends of the sixth buffer mechanism 86, the sixth buffer mechanism 86 can promptly buffer and release a portion of the first composite sheet e, thereby resolving speed reduction issues or wrinkles caused by insufficient tension, thereby improving production capacity and product quality.

[0491] For example, referring to Figures 17 and 18 , the sixth buffer mechanism 86 may include one or more rollers, and the first composite sheet e can pass around the one or more rollers of the sixth buffer mechanism 86 before entering the winding mechanism 40. The length of the first composite sheet e buffered in the sixth buffer mechanism 86 can be flexibly adjusted. For example, the sixth buffer mechanism 86 can store the first composite sheet e by winding, stacking, or other methods.

[0492] Exemplarily, in combination with Figure 18, the sixth cache mechanism 86 includes a sixth fixed roller 861 and a sixth floating roller 862 arranged at intervals, the sixth fixed roller 861 is fixed relative to the first aggregation mechanism 31, and the sixth floating roller 862 can approach or move away from the sixth fixed roller 861 to change the length of the first composite sheet e cached by the sixth cache mechanism 86, wherein the movement direction of the sixth floating roller 862 intersects with the conveying direction of the first aggregation mechanism 31.

[0493] The sixth fixed roller 861 refers to the roller body in the sixth cache mechanism 86 that is fixedly arranged relative to the first aggregation mechanism 31, that is, the position of the sixth fixed roller 861 is also fixed relative to the frame; the sixth fixed roller 861 can be a cylindrical roller body, or a prismatic roller body or a roller body of other shapes; the material of the sixth fixed roller 861 can include plastic, metal or other materials; the sixth fixed roller 861 can rotate relative to the frame, or be fixed relative to the frame; the sixth fixed roller 861 can be a passive roller and rotate with the movement of the first composite sheet e, and the sixth fixed roller 861 can also be an active roller and rotate by being driven by a driving device such as a motor.

[0494] The sixth floating roller 862 refers to a roller in the sixth buffer mechanism 86 that can move relative to the sixth fixed roller 861, that is, the position of the movable roller can be changed on the frame; the sixth floating roller 862 can be a cylindrical roller, or a prismatic roller or a roller of other shapes; the material of the sixth floating roller 862 can include plastic, metal or other materials; the sixth floating roller 862 can rotate relative to the frame, or be fixed relative to the frame; the sixth floating roller 862 can be a passive roller and rotate with the movement of the pole piece and the diaphragm, or the sixth floating roller 862 can be an active roller and rotate by being driven by a driving device such as a motor.

[0495] The sixth floating roller 862 is movable in a direction approaching and away from the sixth fixed roller 861. When the sixth floating roller 862 moves away from the sixth fixed roller 861, the length of the first composite sheet e stored in the sixth buffer mechanism 86 increases; when the sixth floating roller 862 moves toward the sixth fixed roller 861, the length of the first composite sheet e stored in the sixth buffer mechanism 86 decreases, releasing a portion of the first composite sheet e.

[0496] The floating of the sixth floating roller 862 can be either passive or active. In some embodiments, the floating of the sixth floating roller 862 is achieved by elastic elements such as springs and rubber strips, in which case the sixth floating roller 862 is passively floating. In other embodiments, the floating of the sixth floating roller 862 is achieved by active power elements such as air cylinders and hydraulic cylinders, in which case the sixth floating roller 862 is actively floating.

[0497] The number of sixth fixed rollers 861 can be one or two or more; the number of floating rollers can be one or two or more; when the number of sixth fixed rollers 861 and sixth floating rollers 862 are both two or more, the sixth fixed rollers 861 and the sixth floating rollers 862 can be alternately arranged in sequence along the conveying path of the first composite sheet e.

[0498] This embodiment provides some specific structures of the sixth cache mechanism 86, which realizes the caching and releasing effect of the first composite sheet e through the movement of the sixth floating roller 862. The sixth cache mechanism 86 can adjust the length of the cached first composite sheet e to adapt to the winding speed of the winding mechanism 40 and the speed of cutting the pole piece.

[0499] During the production process, the sixth buffer mechanism 86 buffers materials and continuously delivers them downstream, allowing the third cutting mechanism 63 to perform cutting operations without deceleration, unaffected by the laminating operations upstream of the sixth buffer mechanism 86. For example, as shown in FIG17 , where laminating precision requirements are high and operation speeds are slow, the sixth buffer mechanism 86 is used to buffer the first composite sheet e, formed by laminating the first electrode sheet a, the first diaphragm c, and the second electrode sheet b. The third cutting mechanism 63 is used to cut the second diaphragm d connecting adjacent electrode assemblies 200, requiring lower precision and operating at a faster rate. While the sixth buffer mechanism 86 buffers the materials, slowing the laminating speed of the first polymerization mechanism 31, the sixth buffer mechanism 86 can stably and continuously deliver the first composite sheet e to the sixth polymerization mechanism 36 without reducing the edge sealing rate. Consequently, the third cutting mechanism 63 can cut the strip electrode assembly 200 without deceleration, improving winding efficiency and, consequently, overall production capacity.

[0500] In some embodiments, with reference to FIG18 , when the winding device 100 includes the sixth buffer mechanism 86 , the first cutting mechanism 61 may be provided between the first feeding mechanism 11 and the first aggregation mechanism 31 , and the second cutting mechanism 62 may be provided between the second feeding mechanism 12 and the first aggregation mechanism 31 .

[0501] In this way, when the first electrode sheet a and the second electrode sheet b are pre-cut before the first aggregation mechanism 31, the sixth buffer mechanism 86 can buffer and release the first composite sheet e, thereby ensuring that the electrode sheet cutting does not affect the winding mechanism 40's winding of the electrode sheet, significantly improving winding efficiency. Furthermore, both the first cutting mechanism 61 and the second cutting mechanism 62 can be spatially separated from the winding mechanism 40, eliminating the adverse effects of cutting chips falling into the electrode assembly 200 being wound on the winding needle 42, thereby further improving the quality of the electrode assembly 200.

[0502] In some embodiments, referring to FIG18 , when the first composite sheet e does not include the second diaphragm d, for example, in some embodiments, referring to FIG20 , the first electrode sheet a, the first diaphragm c, and the second electrode sheet b can be fed separately into the first polymerization mechanism 31. That is, before feeding into the first polymerization mechanism 31, the first diaphragm c is not pre-stacked with either the first electrode sheet a or the second electrode sheet b. This simplifies the mechanism and eliminates the need for a polymerization mechanism upstream of the first polymerization mechanism 31, saving space.

[0503] When the winding apparatus 100 includes the sixth buffer mechanism 86, the first image acquisition device 71 can be located between the first polymerization mechanism 31 and the sixth buffer mechanism 86. The first image acquisition device 71 can also be located between the sixth buffer mechanism 86 and the sixth polymerization mechanism 36. When the first image acquisition device 71 is located between the sixth buffer mechanism 86 and the sixth polymerization mechanism 36, defects in the first composite sheet e generated during the polymerization process and the buffering process can be detected by the first image acquisition device 71, thereby improving the quality of the electrode assembly 200 produced.

[0504] Of course, when the first composite sheet e does not contain the second diaphragm d, the first electrode piece a, the first diaphragm c and the second electrode piece b may not be fed separately into the first polymerization mechanism 31. For example, a seventh polymerization mechanism may be set upstream of the first polymerization mechanism 31 to preferentially polymerize the first electrode piece a and the first diaphragm c. Alternatively, an eighth polymerization mechanism may be set upstream of the first polymerization mechanism 31 to preferentially polymerize the first diaphragm c and the second electrode piece b. These will not be elaborated here.

[0505] The winding apparatus 100 may also not include the sixth convergence mechanism 36. For example, referring to FIG. 20 and FIG. 21 , in some embodiments, the fourth feeding mechanism 22 and the first composite sheet e converge at the winding mechanism 40. In this case, the fourth feeding mechanism 22 is not located downstream of the first convergence mechanism 31, but is located on one side of the winding mechanism 40.

[0506] 20 and 21 , the fourth feeding mechanism 22 is provided on one side of the winding mechanism 40 , and the fourth feeding mechanism 22 is used to transfer the second diaphragm d to the winding needle 42 located at the winding station 4101 , and the first composite sheet e and the second diaphragm d converge on the winding needle 42 of the winding station 301 .

[0507] In this way, as shown in Figures 20 and 21 , the fourth feeding mechanism 22 directly delivers the second separator d to the winding mechanism 40, allowing the first composite sheet e delivered by the first polymerization mechanism 31 and the second separator d delivered by the fourth feeding mechanism 22 to be wound together. This allows the fourth feeding mechanism 22 to directly deliver the second separator d to the winding apparatus 100, and the winding needle 42 located at the winding station 4101 can wind the first composite sheet e and the second separator d...

Claims

1. A winding device for producing an electrode assembly, wherein the electrode assembly comprises a first electrode sheet, a second electrode sheet, a first diaphragm and a second diaphragm, wherein: The winding device comprises: A first polymerization mechanism, used for polymerizing the incoming materials including at least the first pole piece, the first diaphragm and the second pole piece into a first composite sheet; A winding mechanism, located downstream of the first polymerization mechanism, for winding the incoming material including at least the first composite sheet to form the electrode assembly; A first detection device, comprising a first image acquisition device and a processor; Wherein, the first image acquisition device is located between the first polymerization mechanism and the winding mechanism, and is used to obtain an edge position image of at least one of the first pole piece and the second pole piece in the first composite sheet; The processor is used to determine the edge distance according to the edge position image, and determine whether the edge distance meets a threshold.

2. The winding device according to claim 1, wherein: The first image acquisition device is used to obtain edge position images of the first pole piece and the first diaphragm in the first composite sheet, and the edge distance includes the edge distance between the first pole piece and the first diaphragm.

3. The winding device according to claim 1 or 2, wherein: The first image acquisition device is used to obtain edge position images of the second pole piece and the first diaphragm in the first composite sheet, and the edge distance includes the edge distance between the second pole piece and the first diaphragm.

4. The winding device according to any one of claims 1 to 3, wherein: The first image acquisition device is used to obtain edge position images of the first pole piece and the second pole piece in the first composite sheet; or, the first image acquisition device is used to obtain edge position images of the first pole piece, the second pole piece and the first diaphragm in the first composite sheet; the edge distance includes the edge distance between the first pole piece and the second pole piece.

5. The winding device according to any one of claims 1 to 4, wherein: The first image acquisition device is used to obtain the width side edge position image of the first composite sheet in the width direction, and the processor is used to determine the edge distance on one side and / or both sides of the width according to the width side edge position image, and determine whether the edge distance meets the corresponding threshold.

6. The winding device according to claim 5, wherein: The first image acquisition device includes a first acquisition unit, which includes two groups of CCD cameras. The two groups of CCD cameras are arranged on both sides of the first composite sheet along the thickness direction of the first composite sheet, and the two groups of CCD cameras are respectively used to obtain width side edge position images of the first composite sheet in the width direction.

7. The winding device according to claim 6, wherein: Each group of CCD cameras in the first acquisition unit includes two CCD cameras. The two CCD cameras in the same group are arranged at intervals along the width direction of the first composite sheet. The two CCD cameras in the same group are respectively used to obtain width side edge position images of both side edge positions in the width direction of the first composite sheet.

8. The winding device according to any one of claims 5 to 7, wherein: The first image acquisition device includes a second acquisition unit, and the second acquisition unit includes an X-ray camera. The X-ray camera is used to acquire a width side edge position image of the first composite sheet in a width direction.

9. The winding device according to any one of claims 1 to 8, wherein: The first image acquisition device is used to obtain the length end edge position images of the first pole piece and the second pole piece in the length direction of the first composite piece, and the processor is used to determine the edge distance between the head and / or tail of the first pole piece and the second pole piece based on the length end edge position images of the first pole piece and the second pole piece, and determine whether the edge distance meets the corresponding threshold.

10. The winding device according to claim 9, wherein: The first image acquisition device includes a third acquisition unit, and the third acquisition unit includes two groups of CCD cameras. The two groups of CCD cameras are arranged on both sides of the first composite sheet along the thickness direction of the first composite sheet, and the two groups of CCD cameras are respectively used to obtain the head and tail edge position images of the first pole piece and the second pole piece in the length direction of the first composite sheet.

11. The winding device according to claim 9 or 10, wherein: The first image acquisition device includes a fourth acquisition unit, and the fourth acquisition unit includes an X-ray camera. The X-ray camera is used to obtain the head and tail edge position images of the first pole piece and the second pole piece in the length direction of the first composite piece.

12. The winding device according to any one of claims 1 to 11, wherein: Also includes: The rejecting mechanism is located between the first image acquisition device and the winding mechanism, and is used to reject the first composite sheet that does not meet the threshold value according to the signal sent by the processor indicating that the edge distance does not meet the threshold value.

13. The winding device according to any one of claims 1 to 12, wherein: The winding device includes: a first feeding mechanism, a second feeding mechanism, a third feeding mechanism, and a fourth feeding mechanism. The first feeding mechanism is used to release the first pole piece; the second feeding mechanism is used to release the second pole piece; the third feeding mechanism is used to release the first diaphragm; the fourth feeding mechanism is used to release the second diaphragm; the fourth feeding mechanism is arranged upstream of the first polymerization mechanism, and the first polymerization mechanism is used to polymerize the incoming materials including at least the first pole piece, the first diaphragm, the second pole piece and the second diaphragm into a first composite sheet.

14. The winding device according to claim 13, wherein: The first polymerization mechanism is an edge sealing mechanism, and is used to seal and connect at least one of the two side edges of the first diaphragm and the second diaphragm in the width direction.

15. The winding device according to claim 13 or 14, wherein: The winding device also includes: The second polymerization mechanism is located upstream of the first polymerization mechanism and downstream of the first feeding mechanism and the third feeding mechanism, and the second polymerization mechanism is used for polymerizing the first pole piece and the first diaphragm into a second composite sheet.

16. The winding apparatus according to claim 15, wherein: The second polymerization mechanism is a composite mechanism and is used to fixedly connect the first pole piece and the first diaphragm in the second composite sheet.

17. The winding apparatus according to claim 15 or 16, wherein: The winding device also includes: A second image acquisition device, wherein the second image acquisition device is located between the second polymerization mechanism and the first polymerization mechanism and is used to detect the second composite sheet.

18. The winding device according to any one of claims 15 to 17, wherein: The winding device also includes: The first cache mechanism is disposed between the second polymerization mechanism and the first polymerization mechanism and is used for caching the second composite sheet.

19. The winding apparatus according to claim 18, wherein: The winding device comprises a first cutting mechanism for cutting off the first pole piece, and the first cutting mechanism is arranged between the first feeding mechanism and the second polymerization mechanism.

20. The winding device according to any one of claims 15 to 19, wherein: The second pole piece and the second diaphragm are fed into the first polymerization mechanism separately and separately, and the winding device comprises a second cutting mechanism for cutting off the second pole piece, and the second cutting mechanism is arranged between the second feeding mechanism and the first polymerization mechanism.

21. The winding apparatus according to claim 20, wherein: The second cutting mechanism includes a cam cutter.

22. The winding device according to any one of claims 14 to 16, wherein: The winding device also includes: The third polymerization mechanism is located upstream of the first polymerization mechanism and downstream of the second feeding mechanism and the fourth feeding mechanism, and is used for polymerizing the second pole piece and the second diaphragm into a third composite sheet.

23. The winding apparatus according to claim 22, wherein: The third polymerization mechanism is a composite mechanism and is used to fixedly connect the second pole piece and the second diaphragm in the third composite sheet.

24. The winding apparatus according to claim 22 or 23, wherein: The winding device also includes: A third image acquisition device is located between the third polymerization mechanism and the first polymerization mechanism and is used to detect the third composite sheet.

25. The winding device according to any one of claims 22 to 24, wherein: The winding device also includes: The second cache mechanism is disposed between the third polymerization mechanism and the first polymerization mechanism and is used for caching the third composite sheet.

26. The winding apparatus according to claim 25, wherein: The winding device comprises a second cutting mechanism for cutting off the second pole piece, and the second cutting mechanism is arranged between the second feeding mechanism and the third polymerization mechanism.

27. The winding apparatus of claim 13, wherein: The winding device also includes: A fifth polymerization mechanism, the fifth polymerization mechanism is located upstream of the first polymerization mechanism and downstream of the third feeding mechanism, the second feeding mechanism and the fourth feeding mechanism, and the fifth polymerization mechanism is used to polymerize the first diaphragm, the second pole piece and the second diaphragm into a fifth composite sheet.

28. The winding apparatus of claim 27, wherein: The fifth polymerization mechanism is an edge sealing mechanism, and is used to seal and connect at least one of the two side edges of the first diaphragm and the second diaphragm in the width direction.

29. The winding apparatus of claim 27, wherein: The fifth polymerization mechanism is a composite mechanism and is used to respectively fix the second pole piece in the fifth composite sheet to the first diaphragm and the second diaphragm.

30. The winding apparatus according to any one of claims 27 to 29, wherein: The first polymerization mechanism is a composite mechanism and is used to fixedly connect the fifth composite sheet and the first pole sheet.

31. A winding apparatus according to any one of claims 27 to 30, wherein: The winding device also includes: A fifth image acquisition device, the fifth image acquisition device is located between the fifth polymerization mechanism and the first polymerization mechanism, and is used to detect the fifth composite sheet.

32. A winding apparatus according to any one of claims 27 to 31, wherein: The winding device also includes: A fourth cache mechanism is provided between the fifth aggregation mechanism and the first aggregation mechanism and is used for caching the fifth composite sheet.

33. The winding apparatus of claim 32, wherein: The winding device comprises a second cutting mechanism for cutting off the second pole piece, and the second cutting mechanism is arranged between the second feeding mechanism and the fifth aggregation mechanism.

34. A winding apparatus according to any one of claims 27 to 33, wherein: The winding device also includes: A fifth cache mechanism is provided between the first polymerization mechanism and the winding mechanism and is used for caching the first composite sheet.

35. The winding apparatus of claim 34, wherein: The winding device comprises a first cutting mechanism for cutting off the first pole piece, and the first cutting mechanism is arranged between the first feeding mechanism and the first polymerization mechanism.

36. A winding apparatus according to any one of claims 13 to 35, wherein: The winding device includes a third cutting mechanism for cutting the first separator and the second separator, and the third cutting mechanism is provided between the first polymerization mechanism and the winding mechanism.

37. The winding apparatus according to any one of claims 1 to 12, wherein: The winding device includes: a first feeding mechanism, a second feeding mechanism, a third feeding mechanism, and a fourth feeding mechanism. The first feeding mechanism is used to release the first pole piece; the second feeding mechanism is used to release the second pole piece; the third feeding mechanism is used to release the first diaphragm; the fourth feeding mechanism is used to release the second diaphragm; the aggregation position of the second diaphragm and the first composite sheet is located downstream of the first image acquisition device.

38. The winding apparatus of claim 37, wherein: The first polymerization mechanism is a composite mechanism and is used to fixedly connect the first pole piece and the second pole piece in the first composite sheet to the first diaphragm.

39. A winding apparatus according to claim 37 or 38, wherein: The winding device also includes: The sixth polymerization mechanism is located between the first polymerization mechanism and the winding mechanism, the fourth feeding mechanism is located upstream of the sixth polymerization mechanism, and the sixth polymerization mechanism is used to polymerize the first composite sheet and the second diaphragm into a sixth composite sheet.

40. The winding apparatus of claim 39, wherein: The sixth polymerization mechanism is an edge sealing mechanism, and is used to seal and connect the edges of both sides of the first diaphragm and the second diaphragm in the width direction.

41. A winding apparatus according to claim 39 or 40, wherein: The winding device also includes: A sixth image acquisition device is located between the sixth polymerization mechanism and the winding mechanism and is used to detect the sixth composite sheet.

42. A winding apparatus according to any one of claims 39 to 41, wherein: The winding device includes a third cutting mechanism for cutting the first separator and the second separator, and the third cutting mechanism is provided between the sixth polymerization mechanism and the winding mechanism.

43. A winding apparatus according to any one of claims 37 to 42, wherein: The winding device also includes: A sixth buffer mechanism is provided between the first polymerization mechanism and the winding mechanism and is used for buffering the first composite sheet.

44. The winding apparatus of claim 42, wherein: The winding device includes a first cutting mechanism for cutting the first pole piece and a second cutting mechanism for cutting the second pole piece. The first cutting mechanism is arranged between the first feeding mechanism and the first aggregation mechanism, and the second cutting mechanism is arranged between the second feeding mechanism and the first aggregation mechanism.

45. A winding apparatus according to any one of claims 37 to 44, wherein: The first pole piece, the first diaphragm and the second pole piece are separately fed into the first polymerization mechanism.

46. ​​A winding apparatus according to any one of claims 37 to 45, wherein: The fourth feeding mechanism and the first composite sheet are assembled at the winding mechanism.

47. A battery processing device, wherein: Comprising a winding device according to any one of claims 1-46.

48. A battery production line, wherein: Comprising a winding device according to any one of claims 1-47; or, comprising a battery processing device according to claim 36.

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