Winding device, battery processing device, and battery production line

Abstract

A winding device, a battery processing device, and a battery production line, belonging to the technical field of battery manufacturing. The winding device is used for producing an electrode assembly, the electrode assembly comprising a first electrode sheet, a second electrode sheet, a first diaphragm and a second diaphragm. The winding device comprises: a first feeding mechanism, a second feeding mechanism, a third feeding mechanism, a fourth feeding mechanism, a first combining mechanism, a winding mechanism and a first detection apparatus. The first combining mechanism is used for combining incoming materials at least comprising 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 combining mechanism, and is used for winding an incoming material at least comprising the first composite sheet to form the electrode assembly. The first detection apparatus is located between the first combining mechanism and the winding mechanism, and is used for detecting the first composite sheet.

Description

Winding equipment, battery processing equipment and battery production lines

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on Chinese patent application No. 202322664538.X and application date 2023-09-28, Chinese patent application No. 202311498575.6 and application date 2023-11-10, Chinese patent application No. 202410043912.0 and application date 2024-01-11, Chinese patent application No. 202420072183.7 and application date 2024-01-11, Chinese patent application No. 202410557866.6 and application date 2024-05-07, and Chinese patent application No. 202410557506.6 and application date 2024-05-07, and claims the priority of the above Chinese patent applications, and the entire contents of the above Chinese patent applications are hereby incorporated into this application by 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.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a winding device, a battery processing device and a battery production line, wherein the winding device can improve the OH leakage problem.

[0007] In the first aspect, an embodiment of the present application provides a winding device for producing an electrode assembly, the electrode assembly including a first electrode sheet, a second electrode sheet, a first diaphragm and a second diaphragm, the winding device including: a first feeding mechanism, a second feeding mechanism, a third feeding mechanism, a fourth feeding mechanism, a first polymerization mechanism, a winding mechanism and a first detection device, the first feeding mechanism is used to release the first electrode sheet; the second feeding mechanism is used to release the second electrode sheet; the third feeding mechanism is used to release the first diaphragm; the fourth feeding mechanism is used to release the second diaphragm; the first polymerization mechanism is arranged downstream of the first feeding mechanism, the second feeding mechanism and the third feeding mechanism, and 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 is located between the first polymerization mechanism and the winding mechanism, and is used to detect the first composite sheet.

[0008] In the above technical solution, by setting a first polymerization mechanism, the polymerization of the first electrode, the second electrode and the first diaphragm is completed in advance before the electrode is wound, and by setting a first detection device, the first composite sheet is detected before the first composite sheet enters the winding mechanism. Possible defects in the electrode and the diaphragm can be discovered in time, 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, reducing detection blind spots, so that unqualified products can be eliminated in time, thereby helping to improve the quality of the electrode assembly.

[0009] 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.

[0010] 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 detection 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] In some embodiments, the winding apparatus further includes: a second detection device, the second detection device is located between the second polymerization mechanism and the first polymerization mechanism, and is used to detect the second composite sheet.

[0018] In the above technical solution, by arranging a second detection device between the second polymerization mechanism and the first polymerization mechanism, the second detection 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] In some embodiments, the second cutting mechanism comprises a cam cutter.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In some embodiments, the winding apparatus further includes: a third detection device, the third detection device is located between the third polymerization mechanism and the first polymerization mechanism, and is used to detect the third composite sheet.

[0032] In the above technical solution, by arranging a third detection device between the third polymerization mechanism and the first polymerization mechanism, the third detection device can be used to detect the third composite sheet obtained by the third polymerization mechanism and not entering the first polymerization mechanism, so as to timely discover defects and abnormalities in 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] In some embodiments, the winding apparatus further includes: a fifth detecting device, the fifth detecting device being located between the fifth polymerization mechanism and the first polymerization mechanism and being configured to detect the fifth composite sheet.

[0046] In the above technical solution, the fifth detection 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In some embodiments, the second diaphragm and the first composite sheet are bonded at a location downstream of the first detection device.

[0058] In the above technical solution, positioning the first detection 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 detection 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 uniform, making it less likely for the roller to detach from the electrode piece when passing through the transport roller.

[0059] 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.

[0060] In the above technical solution, the displacement of the first pole piece relative to the first diaphragm, the displacement of the second pole piece relative to the first diaphragm, and the displacement 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In some embodiments, the winding apparatus further includes: a sixth detection device, which is located between the sixth polymerization mechanism and the winding mechanism and is used to detect the sixth composite sheet.

[0066] In the above technical solution, the sixth detection device is located between the sixth polymerization mechanism and the winding mechanism, and can comprehensively detect the status of the sixth composite sheet with high accuracy. When the sixth polymerization mechanism is an edge sealing mechanism, the sixth detection device can be used to detect the edge sealing status of the sixth composite sheet, improving the reliability of the edge sealing and ensuring that the diaphragm can reliably limit and protect the second electrode sheet.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] In some embodiments, the first pole piece, the first diaphragm, and the second pole piece are separately fed into the first polymerization mechanism.

[0074] 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.

[0075] In some embodiments, the fourth feeding mechanism and the first composite sheet converge at the winding mechanism.

[0076] 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.

[0077] In a second aspect, an embodiment of the present application provides a battery processing device, including a winding device.

[0078] 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 detection device, and the second detection device, thereby helping to improve the quality of the electrode assembly, thereby improving the quality of the battery.

[0079] In a third aspect, an embodiment of the present application provides a battery production line, including winding equipment or battery processing equipment.

[0080] 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 detection device, and the second detection device, thereby helping to improve the quality of the electrode assembly, thereby improving the quality of the battery.

[0081] 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

[0082] 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.

[0083] FIG1 is a schematic diagram of a battery provided in some embodiments of the present application;

[0084] FIG2 is a schematic diagram of a battery cell provided in some embodiments of the present application;

[0085] FIG3 is a schematic diagram of an electrode assembly provided in some embodiments of the present application;

[0086] FIG4 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0087] FIG5 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0088] FIG6 is a detection schematic diagram of a first detection mechanism provided in some embodiments of the present application;

[0089] FIG7 is a detection schematic diagram of a first detection mechanism provided in some embodiments of the present application;

[0090] FIG8 is a detection schematic diagram of a second detection mechanism provided in some embodiments of the present application;

[0091] FIG9 is a detection schematic diagram of a second detection mechanism provided in some embodiments of the present application;

[0092] FIG10 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0093] FIG11 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0094] FIG12 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0095] FIG13 is a partial enlarged view of FIG12;

[0096] FIG14 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0097] FIG15 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0098] FIG16 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0099] FIG17 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0100] FIG18 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0101] FIG19 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0102] FIG20 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0103] FIG21 is a schematic diagram of a winding device provided in some embodiments of the present application;

[0104] FIG22 is a schematic diagram of a winding mechanism provided in some embodiments of the present application;

[0105] FIG23 is a detection schematic diagram of a seventh detection device provided in some embodiments of the present application;

[0106] FIG24 is a detection schematic diagram of a tenth detection device provided in some embodiments of the present application;

[0107] FIG25 is a schematic diagram of a first composite sheet provided in some embodiments of the present application;

[0108] FIG26 is a detection schematic diagram of a sixth detection device provided in some embodiments of the present application;

[0109] FIG27 is a detection schematic diagram of an eighth detection device provided in some embodiments of the present application;

[0110] FIG28 is a detection schematic diagram of an eighth detection device provided in some embodiments of the present application;

[0111] Figure 29 is a schematic diagram of a battery production line provided in some embodiments of the present application.

[0112] Reference numerals:

[0113] Battery production line 1000; battery processing equipment 1001;

[0114] Winding device 100; Assembly device 400; Stacking device 500;

[0115] First device 101; second device 102;

[0116] First feeding mechanism 11; second feeding mechanism 12; first conveyor belt 14; second conveyor belt 15;

[0117] A third feeding mechanism 21; a fourth feeding mechanism 22;

[0118] First polymerization mechanism 31; mechanism 1 composite roller 1 311; mechanism 1 composite roller 2 312; first composite gap 313;

[0119] Second aggregation mechanism 32; third aggregation mechanism 33; fourth aggregation mechanism 34;

[0120] Fifth polymerization mechanism 35; mechanism five composite roller one 351; mechanism five composite roller two 352; fifth composite gap 353;

[0121] Sixth aggregation mechanism 36;

[0122] Winding mechanism 40; turret 41; workstation 401; winding station 4101; finishing station 4102;

[0123] Gluing station 4103; blanking station 4104; retraction station 4105; winding needle 42;

[0124] Finishing assembly 43; finishing roller 431; adhesive roller 432;

[0125] Unloading mechanism 50; clamping jaw 51; platform 52;

[0126] First cutting mechanism 61; first cutter 611; first abutting member 612;

[0127] Second cutting mechanism 62; first cam cutter 621; second abutting member 622;

[0128] The third cutting mechanism 63; the second cam cutter 631; the third abutting member 632;

[0129] First deviation-correcting device 66; second deviation-correcting device 67; third deviation-correcting device 68;

[0130] First detection device 71; second detection device 72; third detection device 73;

[0131] Fifth detection device 75; sixth detection device 76; detector 1 761; detector 2 762;

[0132] Seventh detection device 77; eighth detection device 78; ninth detection device 791; tenth detection device 792;

[0133] First buffer mechanism 81; first fixed roller 811; first floating roller 812;

[0134] A second cache mechanism 82;

[0135] Fourth buffer mechanism 84; fourth fixed roller 841; fourth floating roller 842;

[0136] Fifth buffer mechanism 85; fifth fixed roller 851; fifth floating roller 852;

[0137] Sixth buffer mechanism 86; sixth fixed roller 861; sixth floating roller 862;

[0138] First transmission member 91; second transmission member 92; third transmission member 93;

[0139] Fourth transmission member 94; fifth transmission member 95; sixth transmission member 96;

[0140] First insert feeding mechanism 97; second insert feeding mechanism 98;

[0141] Electrode assembly 200;

[0142] First pole piece a; second pole piece b; first diaphragm c; second diaphragm d;

[0143] First composite sheet e; second composite sheet f; third composite sheet g;

[0144] Fourth composite sheet h; fifth composite sheet j; sixth composite sheet k; seventh composite sheet m;

[0145] Battery 300 ; battery cell 301 ; housing 3011 . DETAILED DESCRIPTION

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] The term "plurality" used in this application refers to two or more (including two).

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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 .

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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).

[0167] 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.

[0168] As shown in Figures 3 and 4, a 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 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 sheet a; the second feeding mechanism 12 is used to release the second electrode sheet b; the third feeding mechanism 21 is used to release the first separator c; and the fourth feeding mechanism 22 is used to release the second separator d.

[0169] 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. 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] As shown in Figure 4, the winding device 100 also includes a winding mechanism 40. 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.

[0178] As shown in FIG4 , the winding apparatus 100 further includes a first polymerization mechanism 31, which 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 a first electrode sheet a, a first separator c, and a second electrode sheet b into a first composite sheet e. A winding mechanism 40, located downstream of the first polymerization mechanism 31, winds the incoming materials comprising at least the first composite sheet e to form the electrode assembly 200.

[0179] 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.

[0180] 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.

[0181] 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 transported 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 transported 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 transported 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 transported to the first polymerization mechanism 31, so that the second diaphragm d can serve as the input material of the first polymerization mechanism 31.

[0182] 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.

[0183] 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.

[0184] Of course, the first composite sheet e can also be designed as the first electrode sheet a stacked between the second diaphragm d and the first diaphragm c. To simplify the description, the following mainly uses the second electrode sheet b stacked between the second diaphragm d and the first diaphragm c as an example.

[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] It is worth noting that the "polymerization" described in this article should be understood in a broad sense, and the 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 also include a composite connection between the electrode and the diaphragm, or it can also include edge sealing connection between diaphragms, etc.

[0187] 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.

[0188] For example, in the above-mentioned 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, that is, the first electrode piece a and the first diaphragm c are partially connected, or are completely connected and inseparable, or they are in a non-connected and attached state. 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, that is, the second electrode piece b and the first diaphragm c are partially connected, or are completely connected and inseparable, or they are in a non-connected and attached state.

[0189] For example, in the above-mentioned four-in-one composite sheet polymerized 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, that is, the first electrode piece a and the first diaphragm c are partially connected, or are integrally connected and inseparable, or they are in a non-connected fitted state. 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, that is, the second electrode piece b and the first diaphragm c are partially connected, or are integrally connected and inseparable, or they are in a non-connected fitted state. The second diaphragm d and the adjacent electrode piece may be in contact but not connected, or they may be in contact and connected, that is, the second diaphragm d and the adjacent electrode piece are partially connected, or are integrally connected and inseparable, or they are in a non-connected fitted state. The edge of the first diaphragm c extending beyond the electrode piece and the edge of the second diaphragm d extending beyond the electrode piece may be non-connected, continuously connected, or intermittently connected.

[0190] 4 , the winding device 100 further includes a first detecting device 71 . The first detecting device 71 is located between the first polymerization mechanism 31 and the winding mechanism 40 and is used to detect the first composite sheet e.

[0191] It is worth noting that "the first detection 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 detection device 71, 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 can first be inspected by the first detection device 71 before entering the winding mechanism 40.

[0192] Illustratively, the first detection device 71 may include a camera, a machine vision detection device, or other structures. Illustratively, the first detection device 71 may also include other devices such as a control device. The first detection device 71 may acquire image information (e.g., position, color, shape, etc.) of the first composite sheet e and convert the image information into a digital signal that is transmitted to the control device, so that the control device can determine whether the first composite sheet e meets the requirements according to a preset program.

[0193] Thus, by disposing the first detection device 71 between the first polymerization mechanism 31 and the winding mechanism 40, the first composite sheet e can be inspected, thereby determining the quality of the first composite sheet e. Specifically, the first detection device 71 is positioned at this location to detect the state of the first composite sheet e after polymerization by the first polymerization mechanism 31, and can more comprehensively detect the state of the entire first composite sheet e. Because the composited first composite sheet e will enter the winding needle 42 for winding, the head end of the first composite sheet e will be difficult to detect after entering the winding needle 42. Moreover, because the positions of the pole pieces and diaphragms in the polymerized first composite sheet e are relatively stable and less prone to displacement or misalignment, the state of the first composite sheet e detected by the first detection device 71 between the first polymerization mechanism 31 and the winding mechanism 40 is relatively close to or identical to the state of the first composite sheet e after winding. The detection results of the first detection device 71 can be highly accurate, and the detection of the first composite sheet e is more comprehensive.

[0194] Since the current lamination of the electrode and the diaphragm is usually carried out at the winding needle, the head ends of the electrode and the diaphragm entering the winding needle are not easily detected by the detection equipment, which easily leads to the omission of OH (overhang, the excess part, which can be the OH between the cathode and anode electrodes, or the OH between the diaphragm and the electrode) and the omission of electrode corner crushing defects. Accordingly, in this embodiment, the winding device 100 includes a first polymerization mechanism 31 and a first detection device 71, and the first detection device 71 is arranged between the first polymerization mechanism 31 and the winding mechanism 40. After polymerization by the first polymerization mechanism 31, the positions of the electrode and the diaphragm in the first composite sheet e are relatively fixed and not easy to shift. After detection by the first detection device 71, the structure of the first composite sheet e is not easy to change, and the detection result is more accurate. At the same time, arranging the first detection device 71 upstream of the winding mechanism 40 also enables the first detection device 71 to more comprehensively detect the first composite sheet e, reducing the area of ​​blind spots or undetectable parts and improving the accuracy of detection. This avoids the situation where defects of the first electrode piece a, the first diaphragm c, the second electrode piece b and the second diaphragm d are blocked and cannot be accurately detected after they are wound at the winding needle 42 to form the electrode assembly 200, thereby improving the detection accuracy and reducing the risk of missing defects during the production process of the electrode assembly 200.

[0195] For example, the detection function of the first detection device 71 may include, but is not limited to, at least one of the following.

[0196] Exemplarily, the first detection device 71 is located after the first polymerization mechanism 31 and before the winding mechanism 40, and can be used to detect the relative position of the second electrode piece b and the first electrode piece a in the first composite sheet e, such as judging whether the second electrode piece b and the first electrode piece a are completely covered, the OH of the anode electrode piece covering the cathode electrode piece (that is, the size of the two side edges of the anode electrode piece active material area exceeding the two side edges of the cathode electrode piece active material area in the width direction), etc. By improving the OH leakage problem, the distance on both sides of the width of the second electrode piece b in the electrode assembly 200 formed by subsequent winding exceeds the edge of the first electrode piece a meets the requirements, which is conducive to solving the lithium plating problem. Exemplarily, in the formed first composite sheet e, the length and width of the anode electrode piece are both larger than the cathode electrode piece, so that the anode electrode piece can cover the cathode electrode piece.

[0197] Exemplarily, the first detection device 71 is located after the first polymerization mechanism 31 and before the winding mechanism 40, and 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 (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.

[0198] Exemplarily, the first detection device 71 is located after the first polymerization mechanism 31 and before the winding mechanism 40, and can 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.).

[0199] Illustratively, the first detection device 71 is located after the first polymerization mechanism 31 and before the winding mechanism 40, and can 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.

[0200] For example, the first detection device 71 is located after the first aggregation mechanism 31 and before the winding mechanism 40. It can be used to detect whether the first composite sheet e has problems such as head swing or tail swing. At the cut point of the pole piece, the pole piece is prone to swing. The phenomenon of the pole piece's head being offset is called "head swing", and the phenomenon of the pole piece's tail being offset is called "tail swing".

[0201] 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 detection device to detect them. The CCD detection device takes pictures toward the winding needle. Due to the angle limitation, the head of the electrode assembly is difficult to be photographed by the CCD detection device when winding, and the tail of the electrode assembly is also difficult to be photographed when unwinding, resulting in a blind spot in the detection of the electrode assembly, and it is difficult to detect the problem of the electrode piece swinging head and tail.

[0202] Therefore, the winding device 100 provided in the embodiment of the present application, by setting a first polymerization mechanism 31, completes the polymerization of the first electrode a, the second electrode b and the first diaphragm c before the electrode is wound, and by setting a first detection device 71, before the first composite sheet e enters the winding mechanism 40, it comprehensively detects the first composite sheet e, and promptly discovers possible defects in the electrode and 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 detection blind spots, so that unqualified products can be eliminated in time, thereby helping to improve the quality of the electrode assembly 200.

[0203] 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. Furthermore, the two pole pieces have free ends, which means that the two pole pieces are not offset before entering the winding needle, but are offset after entering the winding needle. Therefore, the relative position of the two pole pieces is not accurately detected at the beginning of winding.

[0204] In the embodiment of the present application, the first aggregation mechanism 31 in the winding device 100 aggregates the second electrode piece b, the first electrode piece a, and the separator before the winding needle 42, forming 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 piece b and the first electrode piece a is relatively stable, thereby enabling the first detection device 71 to accurately and easily detect the relative position between the second electrode piece b and the first electrode piece a. There are no blind spots in the imaging, and the entire head, middle, and tail of the first composite sheet e can be captured, ensuring that the relative position of the second electrode piece b and the first electrode piece a is correct, and there is no missed OH at the head and tail, which helps to improve the quality of the electrode assembly 200.

[0205] Furthermore, by providing the first aggregation mechanism 31 and the 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 concentrate the aggregation of 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 rationality of the layout of the winding apparatus 100 and facilitating the layout of various functional devices and mechanisms, such as the layout of the first detection device 71, thereby helping to improve the quality of the electrode assembly 200.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] For example, when the first detection device 71 is disposed 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 detection device 71 can be disposed between the first aggregation mechanism 31 and the third cutting mechanism 63 (see Figures 4 and 5), or the first detection device 71 can also be disposed between the third cutting mechanism 63 and the winding mechanism 40.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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 detection 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 device for detecting the relative position of the second electrode piece b and the first electrode piece a in the first composite sheet e, the detection device for detecting the relative position of the first diaphragm c and the electrode piece in the first composite sheet e, the detection device for detecting 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 the 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 defect omission, and timely eliminate unqualified products, thereby improving the quality of the electrode assembly 200.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 5 to 7 , when the first polymerization mechanism 31 is an edge sealing mechanism, the first detection device 71 can be used to detect the edge sealing state of the first composite sheet e.

[0226] The first detection device 71 is located downstream of the edge sealing mechanism, so that the first composite sheet e can be conveyed to the first detection device 71 after edge sealing, so that the first detection device 71 can detect the state of the formed edge sealing. For example, edge sealing defects such as electrode piece folding angle, wrinkling of the first diaphragm c and the second diaphragm d, edge sealing failure, edge sealing misalignment, edge sealing size, and grayscale difference can be detected. For example, the width and position of the edge sealing in the width direction F2 of the first diaphragm c and the second diaphragm d can be detected, so that the first diaphragm c, the second diaphragm d and the edge sealing mechanism can be adjusted according to the detection results to ensure that the width of the formed edge sealing is 0.5mm to 1mm, and the edge sealing is generally located in the middle of the portion where the first diaphragm c and the second diaphragm d extend beyond the edge of the second electrode piece b. This improves the reliability of the edge sealing, and the first diaphragm c and the second diaphragm d can reliably limit and protect the second electrode piece b. For example, as shown in FIG6 and FIG7 , first detection 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.

[0227] The first detection device 71 can adopt a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different detection devices can be the same or different. For example, the first detection device 71 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 as to analyze, process and store the optical image. For example, the first detection 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.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 4 , in some embodiments, when the winding device 100 includes a second polymerization mechanism 32 , the winding device 100 may further include a second detection device 72 , which is located between the second polymerization mechanism 32 and the first polymerization mechanism 31 and is used to detect the second composite sheet f.

[0238] It is worth noting that "the second detection device 72 is located 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 second detection device 72, the first polymerization mechanism 31, and the second polymerization mechanism 32 are not limited), but a restriction on the order of the workstations, that is, the second composite sheet f formed by the polymerization of the second polymerization mechanism 32 can first be inspected by the second detection device 72 before entering the first polymerization mechanism 31.

[0239] 4 , a second detection device 72 is disposed between the second aggregation mechanism 32 and the first aggregation mechanism 31 and is used to inspect the second composite sheet f. Exemplarily, the second detection device 72 may include a camera, a machine vision detection device, or other structures. Exemplarily, the second detection device 72 may also include other devices such as a control device. The second detection device 72 can obtain image information (e.g., position, color, shape, etc.) of the second composite sheet f relative to the composite sheet f, and can convert this image information into a digital signal and transmit it to the control device, so that the control device can determine whether the second composite sheet f meets the requirements according to a preset program.

[0240] 4 , by setting a second detection device 72 between the second polymerization mechanism 32 and the first polymerization mechanism 31, the second detection 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, so as to facilitate timely response when problems occur in the second composite sheet f, thereby reducing the negative impact on subsequent processes and improving product quality.

[0241] 5 , illustratively, the second detection 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 detection 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 exceeds the edge of the active material area of ​​the first electrode piece a in the width direction of the electrode piece. An OH defect means that the size of the exceeding portion does not meet the required size range.

[0242] 5 , when the second polymerization mechanism 32 is a composite mechanism, the second detection device 72 is disposed downstream of the second polymerization 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 breakage of the first electrode sheet a.

[0243] For example, as shown in Figures 5, 8, and 9, a second detection 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 detection device 72 can sequentially detect multiple locations along the length of the material while the material is in motion, or it can continuously detect the material along its length.

[0244] The second detection device 72 can be a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, or the like. The different detection devices can be of the same or different types. For example, the second detection 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.

[0245] When the first polymerization mechanism 31 is an edge-sealing mechanism and the second polymerization mechanism 32 is a composite mechanism, the edge-sealing state and composite state are respectively detected by the first detection device 71 and the second detection device 72, enabling more comprehensive detection. The second detection device 72 can detect whether the relative position of the first electrode piece a and the first diaphragm c is accurate 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, causing corrosion and leakage.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] The first buffer mechanism 81 can store the second composite sheets f composited by the second polymerization mechanism 32 by winding, stacking, etc.

[0252] 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.

[0253] 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 .

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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 .

[0262] 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.

[0263] 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.

[0264] 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.

[0265] When the winding apparatus 100 includes a first buffer mechanism 81, the second detection device 72 can be located upstream of the first buffer mechanism 81 (e.g., in the embodiment shown in FIG4 ), or downstream of the first buffer mechanism 81 (e.g., in the embodiment shown in FIG5 ). As shown in FIG5 , when the second detection device 72 is located downstream of the first buffer mechanism 81, the second detection device 72 can detect the second composite sheet f released by 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 detection device 72, which is beneficial for improving the quality of the electrode assembly 200 used in production.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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 .

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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 .

[0274] 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.

[0275] 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 .

[0276] 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.

[0277] 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.

[0278] 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 .

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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 .

[0283] 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.

[0284] 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] 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.

[0289] 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.

[0290] 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.

[0291] 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.

[0292] 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.

[0293] 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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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.

[0301] 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.

[0302] 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.

[0303] 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.

[0304] 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.

[0305] 10 , in some embodiments, when the winding device 100 includes a third polymerization mechanism 33 , the winding device 100 may further include a third detection device 73 , which is located between the third polymerization mechanism 33 and the first polymerization mechanism 31 and is used to detect the third composite sheet g.

[0306] It is worth noting that "the third detection device 73 is located between the third polymerization mechanism 33 and the first polymerization mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the third detection device 73, the third polymerization mechanism 33, and the first polymerization mechanism 31 are not limited), but a restriction on the order of the workstations, that is, the third composite sheet g formed by the polymerization of the third polymerization mechanism 33 can first be inspected by the third detection device 73 before entering the first polymerization mechanism 31.

[0307] With reference to Figure 10 , a third detection 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 detection device 73 may include a camera, a machine vision detection device, or other structures. Exemplarily, the third detection device 73 may also include other devices such as a control device. The third detection device 73 can capture image information (e.g., position, color, shape, etc.) of the third composite sheet g and convert this image information into a digital signal that is transmitted to the control device, allowing the control device to determine whether the third composite sheet g meets requirements according to a preset program.

[0308] 10 , by setting a third detection device 73 between the third polymerization mechanism 33 and the first polymerization mechanism 31, the third detection device 73 can be used to detect the third composite sheet g obtained by polymerization 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.

[0309] In conjunction with Figure 10 , the third detection device 73 is used to detect the relative position of the second electrode piece b and the second diaphragm d in the third composite sheet g. Thus, the third detection device 73 can detect whether the second diaphragm d exceeds the OH of the second electrode piece b. "The second diaphragm d exceeds the OH of the second electrode piece b" refers to the extent to which the edge of the second diaphragm d exceeds the edge of the active material area of ​​the second electrode piece b in the width direction of the electrode piece. A defective OH means that the size of the exceeding portion does not meet the required size range.

[0310] 10 , when the third aggregation mechanism 33 is a composite mechanism, the third detection 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 folding and breakage of the second electrode sheet b.

[0311] For example, a third detection device 73 is provided on one side of the third composite sheet g in the thickness direction F1 to detect defects and other information of the second composite sheet f. The third detection device 73 can sequentially detect multiple locations along the length of the material while the material is in motion, or it can continuously detect the material along its length.

[0312] For example, the third detection device 73 may employ a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, or the like, and the different detection devices may be of the same or different types. For example, the third detection 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.

[0313] 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 detection device 71 and the third detection device 73, enabling more comprehensive detection. Specifically, the third detection 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, thereby improving 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, causing corrosion and leakage.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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 .

[0321] 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.

[0322] 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.

[0323] 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.

[0324] When the winding apparatus 100 includes a second buffer mechanism 82, the third detection device 73 can be located upstream of the second buffer mechanism 82 (e.g., in the embodiment shown in FIG10 ), or downstream of the second buffer mechanism 82. When the third detection device 73 is located downstream of the second buffer mechanism 82, the third detection 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 detection device 73, which is beneficial for improving the quality of the electrode assembly 200 used in production.

[0325] 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 ).

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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 detection device 75, the fourth buffer mechanism 84, the fifth buffer mechanism 85, and the like, described later.

[0331] 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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] 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.

[0338] 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 .

[0339] 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.

[0340] 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.

[0341] 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.

[0342] 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.

[0343] 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.

[0344] 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.

[0345] 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 .

[0346] 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.

[0347] 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.

[0348] 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 detection device 75 , the fifth detection device 75 being located between the fifth polymerization mechanism 35 and the first polymerization mechanism 31 and being used to detect the fifth composite sheet j.

[0349] It is worth noting that "the fifth detection device 75 is located between the fifth polymerization mechanism 35 and the first polymerization mechanism 31" is not a restriction on the spatial position (that is, in space, the relative positions of the fifth detection device 75, the fifth polymerization mechanism 35, and the first polymerization mechanism 31 are not limited), but a restriction on the order of the work stations, that is, the fifth composite sheet j formed by the polymerization of the fifth polymerization mechanism 35 can first be inspected by the fifth detection device 75 before entering the first polymerization mechanism 31.

[0350] The fifth detection device 75 may be, but is not limited to, a CCD (charge coupled device) camera. Exemplarily, the fifth detection device 75 may include a camera, a machine vision detection device, or other structures. Exemplarily, the fifth detection device 75 may also include other devices, such as a control device. The fifth detection device 75 can capture image information (e.g., position, color, shape, etc.) of the fifth composite sheet j and convert this image information into a digital signal, which is transmitted to the control device, allowing the control device to determine whether the fifth composite sheet j meets the requirements according to a preset program.

[0351] 11 and 12 , by disposing a fifth detection device 75 between the fifth polymerization mechanism 35 and the first polymerization mechanism 31 , the fifth composite sheet j can be detected, thereby obtaining the quality of the fifth composite sheet j.

[0352] Among them, the fifth detection 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.

[0353] For example, in conjunction with Figures 11 and 12 , the fifth detection 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 detection 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 exceeds the active material area edge of the second electrode piece b in the width direction of the electrode piece. An OH defect means that the size of the exceeding portion does not meet the required size range. This allows the first diaphragm c to provide a more reliable insulation between the second electrode piece b and the first electrode piece a.

[0354] For example, a fifth detection 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 detection device 75 can sequentially detect multiple locations along the length of the material while the material is in motion, or can continuously detect the material along its length.

[0355] For example, referring to Figures 11 and 12 , when the fifth aggregation mechanism 35 is a composite mechanism, the fifth detection device 75 is located downstream of the fifth aggregation mechanism 35 and is capable of detecting the composite state of the fifth composite sheet j. For example, it can detect composite defects such as corner folding and damage of the second electrode sheet b.

[0356] For example, in conjunction with Figures 11 and 12 , when the fifth polymerization mechanism 35 is an edge-sealing mechanism, the fifth inspection device 75 can be used to inspect the edge-sealing status of the fifth composite sheet j. After edge-sealing, the fifth composite sheet j can be transferred to the fifth inspection device 75 so that the fifth inspection device 75 can inspect the status of the resulting edge-sealing. For example, edge-sealing defects such as the folded corners of the second electrode sheet b, wrinkles on 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 resulting edge-sealing width is 0.5 mm to 1 mm and 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.

[0357] When the fifth aggregation mechanism 35 is an edge-sealing mechanism, the fifth detection 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 detection 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.

[0358] Therefore, the fifth detection device 75 can detect whether the relative position of the second pole piece b and the first diaphragm c and the second diaphragm d is 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.

[0359] 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.

[0360] At this time, the first detection 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 better solving the lithium plating problem.

[0361] For example, the fifth detection device 75 can adopt a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different detection devices can be the same or different. For example, the fifth detection device 75 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 as to analyze, process and store the optical image. For example, the fifth detection device 75 may include an X-ray camera, which 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.

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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 .

[0366] 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.

[0367] 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.

[0368] 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.

[0369] 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.

[0370] 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.

[0371] 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.

[0372] 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.

[0373] 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.

[0374] 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 .

[0375] When the winding apparatus 100 includes the fourth buffer mechanism 84, the fifth inspection device 75 can be disposed between the fifth polymerization mechanism 35 and the fourth buffer mechanism 84; alternatively, the fifth inspection device 75 can be disposed between the fourth buffer mechanism 84 and the first polymerization mechanism 31. When the fifth inspection device 75 is disposed between the fourth buffer mechanism 84 and the first polymerization mechanism 31, defects in the fifth composite sheet j generated during the polymerization process and the buffering process can be inspected by the fifth inspection device 75, thereby improving the quality of the electrode assembly 200 produced.

[0376] 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.

[0377] 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.

[0378] 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 .

[0379] 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.

[0380] 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.

[0381] 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.

[0382] 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.

[0383] 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.

[0384] 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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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 .

[0389] When the winding apparatus 100 includes the fifth buffer mechanism 85, the first detection device 71 can be disposed between the fifth buffer mechanism 85 and the first polymerization mechanism 31; alternatively, the first detection device 71 can be disposed between the fifth buffer mechanism 85 and the winding mechanism 40. When the first detection device 71 is disposed 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 detection device 71, thereby improving the quality of the electrode assembly 200 produced.

[0390] 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 .

[0391] 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 detection device 71 is positioned downstream of the first aggregating mechanism 31 and is configured to detect the first composite sheet e.

[0392] At this point, the first detection 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 must 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 deposition problem. Alternatively, the first detection device 71 can also be used to detect OH in the diaphragm-encased electrode piece.

[0393] 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 separators c and d. In this case, the first detection device 71 may detect the edge-sealing status. Alternatively, the first convergence mechanism 31 may be a compounding mechanism, etc.

[0394] 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 detection device 71.

[0395] 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.

[0396] 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.

[0397] 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 composite sheet e can be inspected using the first detection device 71. 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 or tail problems, etc.

[0398] For example, in combination with Figure 17, the first detection 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), damaged electrode, etc.

[0399] 17 , the first detection 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.

[0400] For example, in combination with Figure 17, the first detection 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.

[0401] For example, in combination with Figure 17, the first detection 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.

[0402] For example, in combination with Figure 17, the first detection 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 edge of the first diaphragm c exceeds the size of 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.

[0403] Therefore, in combination with Figure 17, the first detection 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 detection 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.

[0404] For example, the first detection 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 detection device 71 may also include other components such as a controller. The first detection device 71 may obtain image information (e.g., position, color, shape, etc.) of the relative electrode piece, diaphragm, and first composite sheet e, and may convert the image information into a digital signal and transmit it to the controller so that the controller can determine whether the electrode piece, diaphragm, and first composite sheet e meet the requirements according to a preset program. For example, the first composite sheet e can be transported straight, and the first detection device 71 can more comprehensively detect the state of the entire first composite sheet e passing through, and the detection result can have a high degree of accuracy.

[0405] 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, the winding equipment 100 includes a first detection device 71 disposed between the first aggregation mechanism 31 and the winding mechanism 40. Placing the first detection device 71 upstream of the winding mechanism 40 enables more comprehensive detection 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. Moreover, 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.

[0406] 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.

[0407] 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.

[0408] 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.

[0409] 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.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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.

[0414] 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.

[0415] 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.

[0416] For example, with reference to Figure 17 , when the first polymerization mechanism 31 is a composite mechanism, the first detection device 71 is located downstream of the first polymerization mechanism 31. The first detection 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 detection device 71 is located downstream of the first polymerization mechanism 31. This allows the first electrode sheet a, first separator c, and second electrode sheet b, after being composited to form the first composite sheet e, to be transferred to the first detection device 71 for detection of the composite state. For example, this can detect composite defects such as folded corners, damage, crushing, and wrinkling of the electrode sheet and separator.

[0417] For example, in conjunction with Figure 17, the first detection device 71 can adopt a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different detection devices can be the same or different. For example, the detection 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 as to analyze, process and store the optical image. For example, the detection device may include an X-ray camera. The X-ray camera has high resolution and can penetrate objects for detection, thereby improving the detection accuracy.

[0418] In addition, with reference to FIG17 , the first detection device 71 can be provided on one or both sides of the material thickness direction F1 as needed. For example, a first detection device 71 can be provided 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 to detect defects in the second electrode piece b and the first electrode piece a. The first detection device 71 can sequentially detect multiple locations in the material length direction F3 during the material movement, or it can continuously detect the material length direction F3.

[0419] 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.

[0420] 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.

[0421] 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.

[0422] 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.

[0423] 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.

[0424] 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.

[0425] 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.

[0426] 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.

[0427] 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.

[0428] 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.

[0429] 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.

[0430] 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.

[0431] In addition, when the sixth polymerization mechanism 36 is an edge sealing mechanism, the detection of the first composite sheet e by the first detection device 71 is helpful to ensure that the first diaphragm c has sufficient edge to be edge sealed with the second diaphragm d, thereby improving the edge sealing quality.

[0432] 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.

[0433] 17 and 18 , when the winding device 100 includes a sixth polymerization mechanism 36 , in some embodiments, the winding device 100 further includes: a sixth detection device 76 , which is located between the sixth polymerization mechanism 36 and the winding mechanism 40 and is used to detect the sixth composite sheet k.

[0434] It is worth noting that "the sixth detection 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 detection 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 detection device 76 before entering the winding mechanism 40.

[0435] Exemplarily, the sixth detection device 76 may include a camera, a machine vision detection device, or other structure. The camera may be a CCD camera, etc. The sixth detection device 76 may also include other components such as a controller. The sixth detection device 76 can obtain image information (e.g., position, color, shape, etc.) of the sixth composite sheet k and convert this image information into a digital signal that is transmitted 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 detection device 76 is disposed between the sixth polymerization mechanism 36 and the winding mechanism 40, and can comprehensively detect the condition of the sixth composite sheet k, resulting in highly accurate detection results.

[0436] The sixth detection 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.

[0437] For example, the sixth detection 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 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 size range. Furthermore, in some embodiments, the sixth detection 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.

[0438] As shown in Figure 17 , illustratively, when the sixth polymerization mechanism 36 is an edge-sealing mechanism, the sixth detection device 76 can be used to detect 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 diaphragm misalignment. For example, the relative position of the edge-sealing formed by the first diaphragm c and the second diaphragm d and the second electrode sheet b can be detected. Based on the detection results, the diaphragm and the sixth polymerization mechanism 36 can be adjusted to ensure that the width and position of the formed edge-sealing meet the requirements of the diaphragm wrapping the second electrode sheet b, thereby improving the reliability of the edge-sealing and enabling the diaphragm to reliably limit and protect the second electrode sheet b. Thus, by using the sixth detection device 76 to detect the edge-sealing status after the first electrode sheet a, the first diaphragm c, the second electrode sheet b, and the second diaphragm d are stacked and edge-sealed to form the electrode assembly 200, more comprehensive detection can be achieved, improving the reliability of the edge-sealing connection and reducing the risk of missed defects during the production of the electrode assembly 200. This improves the positional accuracy of the first electrode sheet a, the first diaphragm c, the second electrode sheet b, and the second diaphragm d.

[0439] 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.

[0440] 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 .

[0441] 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.

[0442] 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 end 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 .

[0443] 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.

[0444] 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 .

[0445] 19 , in some embodiments, the first transmission member 91 is a vacuum adsorption transmission belt.

[0446] 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.

[0447] 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.

[0448] 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.

[0449] 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.

[0450] 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.

[0451] 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.

[0452] 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.

[0453] 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.

[0454] 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.

[0455] 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.

[0456] 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.

[0457] 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.

[0458] 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.

[0459] 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.

[0460] 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.

[0461] 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.

[0462] 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 .

[0463] 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.

[0464] 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.

[0465] When the winding apparatus 100 includes the sixth buffer mechanism 86, the first detection device 71 can be located between the first polymerization mechanism 31 and the sixth buffer mechanism 86. The first detection device 71 can also be located between the sixth buffer mechanism 86 and the sixth polymerization mechanism 36. When the first detection 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 detection device 71, which is beneficial for improving the quality of the electrode assembly 200 produced.

[0466] 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.

[0467] 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.

[0468] 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 .

[0469] 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 together to form the electrode assembly 200. This simplifies the mechanism, eliminating the need for a polymerization mechanism downstream of the first polymerization mechanism 31 and saving space.

[0470] With reference to Figure 21 , two third cutting mechanisms 63 can be provided: one third cutting mechanism 63 is located between the first polymerization mechanism 31 and the winding mechanism 40 and is used to cut the first separator c; the other third cutting mechanism 63 is located between the fourth feeding mechanism 22 and the winding mechanism 40 and is used to cut the second separator d. With reference to Figure 21 , the winding apparatus 100 can also include a second transmission member 92 and a third transmission member 93, respectively located between the two third cutting mechanisms 63 and the winding mechanism 40. The second transmission member 92 is used to convey the first composite sheet e, and the third transmission member 93 is used to convey the second separator d. The third cutting mechanism 63 can include a cam cutter, a linearly reciprocating cutter, a laser cutter, or other similar cutters. By adopting this technical solution, both the first separator c and the second separator d are cut before winding. The third cutting mechanism 63 does not occupy space in the winding mechanism 40, eliminating the need to relocate the winding needle 42, which rotates with the turret 41.

[0471] 4 , a winding device 100 according to some specific implementations of the present application will be described below.

[0472] 4 , the winding device 100 mainly includes a feeding mechanism, a cutting mechanism, a polymerization mechanism, a detection component, a buffer mechanism, a winding mechanism, and the like.

[0473] 4 , the feeding mechanism includes a pole piece feeding mechanism and a diaphragm feeding mechanism. The pole piece feeding mechanism includes a first feeding mechanism 11 (for example, a pole piece roller) and a second feeding mechanism 12 (for example, a pole piece roller); the diaphragm feeding mechanism includes a third feeding mechanism 21 (for example, a diaphragm roller) and a fourth feeding mechanism 22 (for example, a diaphragm roller).

[0474] The first feeding mechanism 11 is used to wind the first electrode a and release the first electrode a; the second feeding mechanism 12 is used to wind the second electrode b and release the second electrode b; the third feeding mechanism 21 is used to wind the first diaphragm c and release the first diaphragm c; the fourth feeding mechanism 22 is used to wind the second diaphragm d and release the second diaphragm d.

[0475] 4 , the polymerization mechanism may include a first polymerization mechanism 31 and a second polymerization mechanism 32 . The winding mechanism 40 may include a turret 41 and five winding pins 42 disposed on the turret 41 . The winding pins 42 are used to wind the stacked electrode sheets and separators. The winding mechanism 40 also includes a finishing assembly 43 , which includes a finishing roller 431 and a glue roller 432 . A material removal mechanism 50 is also provided next to the turret 41 . The material removal mechanism 50 may include a clamp 51 and a platform 52 , or may also include a manipulator or other structure. The clamp 51 is used to remove the wound electrode assembly 200 from the winding pins 42 , and the platform 52 is used to carry and transport the electrode assembly 200 removed by the clamp 51 , so that the wound electrode assembly 200 can be obtained from the platform 52 in subsequent processes.

[0476] Referring to Figure 4, the tail roller 431 is used to press the electrode and the diaphragm. The tail roller 431 refers to the structure in the tail structure 43 that presses the first composite sheet e wound on the winding needle 42. Because the tail end of the electrode and the tail end of the diaphragm are easy to separate and tilt after the first composite sheet e is wound on the winding needle 42, the main function of the tail roller 431 is to press the tail end of the first composite sheet e to reduce the separation of the electrode and the diaphragm at the tail end of the first composite sheet e and increase the stability of the bonding between the electrode and the diaphragm in the first composite sheet e. The tail structure 43 of this embodiment includes a tail roller 431, which presses the electrode and the diaphragm to the winding needle 42 through the tail roller 431, and presses the electrode and the diaphragm together through the pressure of the tail roller 431 to reduce the separation of the electrode and the diaphragm.

[0477] Referring to Figure 4, the glue roller 432 is used to fix the diaphragm to the electrode. The glue roller 432 refers to the structure in the tail structure 43 used to glue on the electrode. The glue roller 432 can stick adhesive paper, tape, or other fixing structures on the tail end of the first composite sheet e to fix the tail end of the first composite sheet e, thereby further reducing the situation where the tail end of the first composite sheet e is lifted, and can also further reduce the situation where the electrode and the diaphragm are separated at the tail end of the first composite sheet e. The tail structure 43 of this embodiment also includes a glue roller 432. After the tail roller 431 presses the electrode and the diaphragm together, the glue roller 432 is used to glue the tail end of the first composite sheet e to further fix the electrode and the diaphragm and obtain a first composite sheet e with a relatively stable connection that is not easy to fall apart, thereby reducing the situation where the electrode and the diaphragm are separated.

[0478] 4 , the cutting mechanism includes a first cutting mechanism 61, a second cutting mechanism 62, and a third cutting mechanism 63. The first cutting mechanism 61 and the second cutting mechanism 62 are both electrode cutting mechanisms. The first cutting mechanism 61 refers to a mechanism for cutting the first electrode a in the winding device 100, and the first cutting mechanism 61 is arranged between the first feeding mechanism 11 and the first polymerization mechanism 31. The second cutting mechanism 62 refers to a mechanism for cutting the second electrode b in the winding device 100, and the second cutting mechanism 62 is arranged between the second feeding mechanism 12 and the first polymerization mechanism 31. The third cutting mechanism 63 refers to a diaphragm cutting mechanism for cutting the diaphragm in the winding device 100, and the third cutting mechanism 63 is arranged upstream of the winding mechanism 40.

[0479] The electrode cutting mechanism can include various cutting mechanisms, such as a linear cutter that reciprocates along a straight line, a cam cutter that rotates about an axis, etc. The electrode cutting mechanism can be selected as a cutting mechanism for cutting the cathode electrode piece or a cutting mechanism for cutting the anode electrode piece as needed. The diaphragm cutting mechanism can include various cutting mechanisms, such as a linear cutter that reciprocates along a straight line, a cam cutter that rotates about an axis, etc.

[0480] Depending on the structure of the electrode assembly 200, the electrode assembly 200 typically includes a first separator c and a second separator d. In this case, the third cutting mechanism 63 may include only a cutting mechanism for cutting the first separator c, only a cutting mechanism for cutting the second separator d, a cutting mechanism for both the first separator c and the second separator d, or a cutting mechanism capable of simultaneously cutting the first separator c and the second separator d. The third cutting mechanism 63 is located upstream of the winding mechanism 40, enabling the third cutting mechanism 63 to cut the separator before it enters the winding mechanism 40. The third cutting mechanism 63 may be located downstream of the first polymerization mechanism 31 or upstream of the first polymerization mechanism 31, as needed.

[0481] 4 , the electrode sheet cutting mechanism is located upstream of the first aggregation mechanism 31, and the diaphragm cutting mechanism is provided between the first aggregation mechanism 31 and the winding mechanism 40. This allows the electrode sheet cutting mechanism to cut the electrode sheet before the electrode sheet and diaphragm are aggregated, and the diaphragm cutting mechanism to cut the diaphragm after the electrode sheet and diaphragm are aggregated. This arrangement can easily make the diaphragm longer than the electrode sheet, thereby meeting the design requirements of the electrode assembly 200.

[0482] 4 , the first cutting mechanism 61 includes a first cutter 611 and a first stopper 612 disposed in a relatively spaced relationship. The second cutting mechanism 62 includes a second cam cutter 621 and a second stopper 622 disposed in a relatively spaced relationship. The third cutting mechanism 63 includes a second cam cutter 631 and a third stopper 632 disposed in a relatively spaced relationship.

[0483] Referring to Figure 4 , the first electrode piece a and first diaphragm c wound on the first feeding mechanism 11 and the third feeding mechanism 21 are aggregated at the second aggregation mechanism 32 to form a second composite sheet f. The first aggregation mechanism 31 is used to aggregate the second composite sheet f, the second diaphragm d, and the second electrode piece b into a first composite sheet e. After being composited by the second aggregation mechanism 32, the first electrode piece a and the first diaphragm c are aggregated with the second electrode piece b and the second diaphragm d at the first aggregation mechanism 31 through the first buffer mechanism 81 to form a first composite sheet e. In the first composite sheet e, the first electrode piece a, the first diaphragm c, the second electrode piece b, and the second diaphragm d are stacked in sequence. The second cam cutter 631, located between the first aggregation mechanism 31 and the winding mechanism 40, cooperates with the third abutment 632 to sever the first diaphragm c and the second diaphragm d from the first composite sheet e, forming a single, complete first composite sheet e.

[0484] 4 , the first composite sheet e cut by the second cam cutter 631 and the third push member 632 is wound by the winding needle 42. When the winding needle 42 finishes winding, the winding needle 42 passes through the tail roller 431, the glue roller 432, the unloading mechanism 50 and an empty position in sequence. The unloading mechanism 50 removes the electrode assembly 200 on the winding needle 42 and forms an empty winding needle 42. The empty winding needle 42 can move through the empty position to the winding station 4101 to wind the first composite sheet e again.

[0485] 4 , the detection assembly is located upstream of the winding mechanism 40. The detection assembly includes a first detection device 71 and a second detection device 72. The first detection device 71 is located between the first aggregation mechanism 31 and the winding mechanism 40, and the second detection device 72 is located between the second aggregation mechanism 32 and the first buffer mechanism 81. The detection assembly may include a camera, a machine vision detection device, or other structures. The detection assembly may also include other devices such as a control device. The detection assembly can obtain image information (such as position, color, shape, etc.) and convert the image information into a digital signal and send it to the control device, so that the control device can determine whether the electrode, diaphragm, or composite sheet meets the requirements according to a preset program.

[0486] Placing the detection component between the polymerization mechanism and the winding mechanism 40 can more comprehensively detect the state of the entire first composite sheet e passing through; because the first composite sheet e will enter the winding needle 42 for winding, the head end of the first composite sheet e will be difficult to detect after entering the winding needle 42, and because the positions of the electrode sheet and the diaphragm in the first composite sheet e after polymerization are relatively stable, displacement, misalignment, etc. are not likely to occur. Therefore, the state of the first composite sheet e detected by the detection component located between the polymerization mechanism and the winding mechanism 40 is small or the same as the state of the electrode assembly 200 after winding, and the detection result of the detection component can have a higher accuracy.

[0487] For example, the first electrode piece a is the cathode electrode piece, the second electrode piece b is the anode electrode piece, and in the first composite piece e, the second electrode piece b is stacked between the first diaphragm c and the second diaphragm d. Detection devices (i.e., the second detection device 72 and the first detection device 71) are both provided after the second polymerization mechanism 32 and after the first polymerization mechanism 31, thereby enabling full OH detection at the winding and ending of the electrode pieces. This solves the problem in the related art of missing OH at the head and tail when the cathode and cathode electrodes are respectively wound and inspected at the winding needle.

[0488] In some embodiments, referring to FIG4 , the winding apparatus 100 may further include a transmission member. For example, the transmission member may include a fourth transmission member 94 , a fifth transmission member 95 , and a sixth transmission member 96 . The fourth transmission member 94 is disposed between the first cutting mechanism 61 and the second aggregation mechanism 32 and is used to transport the first electrode sheet a. The fifth transmission member 95 is disposed between the second feeding mechanism 12 and the second cutting mechanism 62 . The sixth transmission member 96 is disposed between the second cutting mechanism 62 and the first aggregation mechanism 31 and is used to transport the second electrode sheet b. For example, the transmission member may be a vacuum conveyor belt, a reciprocating transport trolley, a sheet feeding mechanism, or other structures.

[0489] After the first cutting mechanism 61 cuts the first electrode piece a, the tail end of the first electrode piece a is difficult to fix. Transporting the cut first electrode piece a through the fourth transmission member 94 can fix the first electrode piece a, thereby reducing the movement of the tail end of the first electrode piece a. After the second cutting mechanism 62 cuts the second electrode piece b, the tail end of the second electrode piece b is difficult to fix. Transporting the cut second electrode piece b through the fifth transmission member 95 and the sixth transmission member 96 can fix the second electrode piece b, thereby reducing the movement of the tail end of the second electrode piece b.

[0490] For example, the transmission element is a vacuum adsorption conveyor belt. The principle of the vacuum adsorption conveyor belt is to use vacuum adsorption to adsorb materials on the conveyor belt and transport the materials to the desired location through the conveyor belt. The transmission element is a vacuum adsorption conveyor belt. In addition to being able to transport the first electrode piece a and the second electrode piece b, the transmission element can also adsorb metal debris, dust and other impurities that may be generated during the severing process of the first electrode piece a and the second electrode piece b, thereby reducing the potential negative impact on the electrode piece, the diaphragm and the processing environment. In this embodiment, the second electrode piece b and the first electrode piece a are transported by the transmission element to increase the stability of the transportation and reduce the occurrence of situations such as loss of transportation power after the electrode piece is severed.

[0491] 5 , a winding device 100 according to some specific implementations of the present application will be described.

[0492] Referring to Figure 5 , the winding apparatus 100 includes: a second feeding mechanism 12, a first feeding mechanism 11, a third feeding mechanism 21, a fourth feeding mechanism 22, a first aggregating mechanism 31, a second aggregating mechanism 32, a second detecting device 72, a first detecting device 71, a first buffering mechanism 81, a first cutting mechanism 61, a second cutting mechanism 62, a third cutting mechanism 63, a winding mechanism 40, and conveyor rollers disposed between these mechanisms for conveying the material. The first aggregating mechanism 31 is an edge-sealing mechanism, and the second aggregating mechanism 32 is a laminating mechanism.

[0493] Referring to Figure 5 , the first polymerization mechanism 31 is an edge-sealing mechanism used to seal and connect the edges of the first and second diaphragms c and d on both sides of the second electrode sheet b in the width direction F2, producing a first composite sheet e. The second polymerization mechanism 32 is used to composite the first electrode sheet a (e.g., cathode electrode sheet) with the first diaphragm c, producing a second composite sheet f. A first detection device 71 is located downstream of the first polymerization mechanism 31 and is capable of detecting the edge-sealing status of the first composite sheet e. A second detection device 72 is located downstream of the second polymerization mechanism 32 and is capable of detecting the composite status of the second composite sheet f.

[0494] Referring to Figure 5 , the laminating mechanism is located upstream of the edge-sealing mechanism. It is used to combine the first electrode sheet a and the first diaphragm c to form a second composite sheet f. After the second composite sheet f is transferred to the edge-sealing mechanism, the edge-sealing mechanism is used to seal the second electrode sheet b, the second composite sheet f, and the second diaphragm d to form a first composite sheet e.

[0495] Referring to Figure 5, the second composite sheet f is a sheet obtained by connecting the first pole piece a and the first diaphragm c through a composite mechanism, so that the relative positions of the first pole piece a and the first diaphragm c are fixed, and can be synchronously transmitted to the edge sealing mechanism without being easily offset, which is beneficial to improving the position accuracy of the first pole piece a during the transmission and edge sealing process.

[0496] 5 , the first electrode piece a and the first diaphragm c are firstly compounded by the second polymerization mechanism 32 to obtain the second composite piece f, and then the second composite piece f, the second electrode piece b and the second diaphragm d are sealed by the first polymerization mechanism 31 to obtain an unwound electrode assembly 200, and finally wound into the electrode assembly 200 by the winding mechanism 40.

[0497] The second detection device 72 is installed after the first buffer mechanism 81 and before the first polymerization mechanism 31, and is used to detect composite conditions such as the OH of the first diaphragm c exceeding the first electrode a in the second composite sheet f, the folding angle of the first electrode a, and electrode damage. The first detection device 71 is installed after the first polymerization mechanism 31, and is used to detect the double-sided OH of the anode electrode sheet wrapped around the cathode electrode sheet (that is, the size of the two side edges of the anode electrode sheet active material area exceeding the two side edges of the cathode electrode sheet active material area in the width direction), the electrode folding angle, the wrinkling of the first diaphragm c and the second diaphragm d, and other edge sealing conditions. In this way, it is possible to achieve comprehensive inspection of the electrode assembly 200 produced by the composite edge sealing winding method, and improve the missed elimination of composite edge sealing defects such as electrode sheet OH leakage, head wrinkling, and electrode sheet crushing.

[0498] For example, the first electrode piece a is a cathode electrode piece, the second electrode piece b is an anode electrode piece, and in the first composite sheet e, the second electrode piece b is stacked between the first diaphragm c and the second diaphragm d. Detection devices (i.e., a second detection device 72 and a first detection device 71) are provided after the second polymerization mechanism 32 and after the first polymerization mechanism 31. The second detection device 72 is installed after the first buffer mechanism 81 and before the first polymerization mechanism 31, and can detect composite defects such as diaphragm super-cathode OH, cathode folding, and electrode piece damage. The first detection device 71 is installed after the first polymerization mechanism 31 and before the serpentine correction, and can detect edge defects such as double-sided OH of the anode electrode piece wrapped around the cathode electrode piece, electrode folding, and diaphragm wrinkling in the first composite sheet e. In addition, the winding device 100 can also include a seventh detection device 77 and an eighth detection device 78. The seventh detection device 77 is installed after the cathode electrode piece is unwound and before the first cutting mechanism 61, and can detect defects such as the AT11 width of the front and back sides of the cathode, defective products (such as defective products with yellow labels), and electrode piece damage. The eighth detection device 78 is installed behind the third cutting mechanism 63 and in front of the winding needle 42, and is used to detect the OH on both sides of the anode-cathode package of two adjacent turns of the first composite sheet e on the winding mechanism 40 to avoid OH leakage.

[0499] 11 , a winding device 100 according to some specific implementations of the present application will be described below.

[0500] Referring to Figure 11 , the winding apparatus 100 includes: a second feeding mechanism 12, a first feeding mechanism 11, a third feeding mechanism 21, a fourth feeding mechanism 22, a first aggregating mechanism 31, a fifth aggregating mechanism 35, a first detecting device 71, a fifth detecting device 75, a first cutting mechanism 61, a second cutting mechanism 62, a third cutting mechanism 63, a fifth buffer mechanism 85, a fourth buffer mechanism 84, a winding mechanism 40, and conveyor rollers disposed between the various mechanisms for conveying the material. The first aggregating mechanism 31 is a compounding mechanism, and the fifth aggregating mechanism 35 is an edge-sealing mechanism.

[0501] The first diaphragm c and the second diaphragm d are compositely coated with the second electrode piece b and the portions of the first diaphragm c and the second diaphragm d extending beyond the second electrode piece b are sealed to obtain a fifth composite piece j. The fifth composite piece j is then composited with the first electrode piece a to form a first composite piece e.

[0502] The fifth detection device 75 is installed after the fifth polymerization mechanism 35 and before the fourth buffer mechanism 84, and is used to detect the OH of the first diaphragm c and the second diaphragm d wrapped around the second electrode b, the edge sealing effect, and the edge sealing conditions such as wrinkling of the electrode, the first diaphragm c, and the second diaphragm d. The first detection device 71 is installed after the first polymerization mechanism 31 and before the fifth buffer mechanism 85, and is used to detect the bilateral OH of the anode electrode wrapped around the cathode electrode (that is, the size of the two side edges of the anode electrode active material area exceeding the two side edges of the cathode electrode active material area in the width direction), the electrode fold angle, the wrinkling of the first diaphragm c and the second diaphragm d, etc. In this way, a comprehensive inspection of the electrode assembly 200 produced by the edge sealing composite winding method can be achieved, avoiding the omission of composite edge sealing defects such as missed electrode OH, head wrinkling, and electrode crushing.

[0503] For example, the first electrode piece a is the cathode electrode piece, the second electrode piece b is the anode electrode piece, and in the first composite piece e, the second electrode piece b is stacked between the first diaphragm c and the second diaphragm d. Detection devices (i.e., the fifth detection device 75 and the first detection device 71) are provided after the fifth polymerization mechanism 35 and after the first polymerization mechanism 31, thereby enabling full OH detection at the beginning and end of the electrode piece winding. This solves the problem of missing OH at the beginning and end of the winding when the cathode and cathode electrodes are respectively wound at the winding needle.

[0504] 12 and 13 , a winding device 100 according to some specific implementations of the present application will be described below.

[0505] 12 and 13 , the winding apparatus 100 includes a first polymerization mechanism 31, a fifth polymerization mechanism 35, a winding mechanism 40, a fifth buffer mechanism 85, a fourth buffer mechanism 84, a fifth detection device 75, and a first detection device 71. The fifth polymerization mechanism 35 is used to sequentially stack and composite the second separator d, the second electrode sheet b, and the first separator c to form a fifth composite sheet j. The first polymerization mechanism 31 is used to stack and composite the fifth composite sheet j and the first electrode sheet a to form a first composite sheet e. The winding mechanism 40 is used to wind the first composite sheet e to form the electrode assembly 200. The fifth buffer mechanism 85 is disposed between the first polymerization mechanism 31 and the winding mechanism 40. The first detection device 71 is disposed between the first polymerization mechanism 31 and the fifth buffer mechanism 85. The fourth buffer mechanism 84 is disposed between the fifth polymerization mechanism 35 and the first polymerization mechanism 31. The fifth detection device 75 is disposed between the fifth polymerization mechanism 35 and the fourth buffer mechanism 84.

[0506] The fifth inspection device 75 can inspect the fifth composite sheet j, thereby determining the composite status of at least two of the fifth composite sheet j. The first inspection device 71 can inspect the first composite sheet e, thereby determining the composite status of the first electrode sheet a and the fifth composite sheet j. In other words, the fifth inspection device 75 can inspect the composite status of the second electrode sheet b, the second diaphragm d, and the first diaphragm c, while the first inspection device 71 can inspect the composite status of the fifth composite sheet j and the first electrode sheet a. This ensures strict control of the quality of the first composite sheet e, thereby improving the quality of the electrode assembly 200.

[0507] The first detection device 71 and the fifth detection device 75 can be, but are not limited to, CCD (charge coupled device) cameras.

[0508] 14 , a winding device 100 according to some specific implementations of the present application will be described below.

[0509] Referring to FIG14 , the winding apparatus 100 includes two production devices, namely a first device 101 and a second device 102. The first device 101 and the second device 102 are arranged in parallel. In the first device 101, the second electrode sheet b, the first separator c, and the second separator d are pressed together to form a fifth composite sheet j. In the second device 102, the first electrode sheet a and the fifth composite sheet j are pressed together to form a first composite sheet e.

[0510] Referring to Figure 14, in the first device 101, the first diaphragm c and the second diaphragm d are respectively tightly attached to the opposite surfaces of the second electrode piece b in the thickness direction. The first diaphragm c, the second electrode piece b, and the second diaphragm d are pressed together to form a fifth composite sheet j. The fifth composite sheet j is conveyed to the second device 102 in a flattened state. The flattened state of the fifth composite sheet j refers to the state in which the fifth composite sheet j is unwound and can extend along a straight line. The fifth composite sheet j enters the second device 102 and is pressed together with the first electrode piece a to form a first composite sheet e. The first composite sheet e is conveyed in a flattened state to the winding mechanism 40, where it is wound.

[0511] Referring to Figure 14, in this way, a fifth composite sheet j consisting of a first diaphragm c, a second electrode piece b and a second diaphragm d can be made through the first device 101, and the fifth composite sheet j and the first electrode piece a are stacked and pressed together through the second device 102, so that the fifth composite sheet j and the first electrode piece a are tightly fitted in turn to form a first composite sheet e, thereby improving the structural stability and flatness of the first composite sheet e.

[0512] Referring to Figure 14 , a first detection device 71 is used to detect the relative position of the second electrode piece b and the first electrode piece a in the first composite sheet e. The first detection device 71 can be arranged on one side of the first polymerization mechanism 31 along the conveying direction L. The first detection device 71 can use a laser sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc. to accurately detect the relative position of the second electrode piece b and the first electrode piece a, thereby ensuring that the fifth composite sheet j and the first electrode piece a are pressed together in the correct position. The fifth composite sheet j and the first electrode piece a are pressed together by the first polymerization mechanism 31 to form the first composite sheet e.

[0513] 14 , in this way, the first detection device 71 confirms that the second pole piece b and the first pole piece a are in the correct relative position, thereby avoiding problems after the first composite sheet e is wound due to poor relative position of the second pole piece b and the first pole piece a.

[0514] Before the second cutting mechanism 62 cuts the second electrode sheet b, the second electrode sheet b extends along the conveying direction L. The second insert feeding mechanism 98, the first conveyor belt 14, and the suction plate sequentially suction-hold the tail and head of the second electrode sheet b along the conveying direction L. After the second electrode sheet b is cut, the second insert feeding mechanism 98 and the first deviation-correcting device 66 correct the positions of the head and tail of the second electrode sheet b. The first conveyor belt 14 and the suction plate suction-hold the second electrode sheet b. The second electrode sheet b is laminated and composited with the first and second separators c and d by the fifth polymerization mechanism 35 to form a three-layer fifth composite sheet j.

[0515] The fifth composite sheet j enters the second device 102 via a conveyor roller. The third cutting mechanism 63 of the second device 102 cuts the first and second separators c and d in the fifth composite sheet j so that their dimensions match those of the second electrode sheet b. Before cutting the first and second separators c and d, the first insert feeding mechanism 97, the second conveyor belt 15, and the suction plate sequentially suction the tail and head of the fifth composite sheet j along the conveying direction L. After cutting the first and second separators c and d, the first insert feeding mechanism 97 suctions the next fifth composite sheet j. The second deviation correction device 67 corrects the position of the head and tail of the fifth composite sheet j, and the second conveyor belt 15 and the suction plate suction the previous fifth composite sheet j. The first polymerization mechanism 31 of the second device 102 presses the fifth composite sheet j with the first electrode sheet a to form the first composite sheet e. The first detection device 71 detects and corrects the position of the head and tail of the electrode components.

[0516] 15 , a winding device 100 according to some specific implementations of the present application will be described.

[0517] 15 , the winding device 100 includes a fifth polymerization mechanism 35, a first polymerization mechanism 31, and a first detection device 71. The fifth polymerization mechanism 35 is used to press the second electrode b and the diaphragm, and the first polymerization mechanism 31 is used to press the second electrode b, the first electrode a, and the diaphragm.

[0518] Before the second electrode piece b and the diaphragm are pressed together, a sixth transmission member 96 is provided. The sixth transmission member 96 can transport the second electrode piece b. There is negative pressure in the adsorption hole opened on the sixth transmission member 96. The second electrode piece b can move stably to the area of ​​the fifth polymerization mechanism 35 under the action of the sixth transmission member 96.

[0519] Before the second electrode b, the first electrode a and the diaphragm are pressed together, a fourth transmission member 94 is provided. The fourth transmission member 94 can transport the first electrode a. The adsorption hole opened on the fourth transmission member 94 has a negative pressure. The first electrode a can move stably to the area of ​​the first polymerization mechanism 31 under the action of the fourth transmission member 94, so that the second electrode b, the first electrode a and the diaphragm form a first composite sheet e.

[0520] The first detection device 71 uses an X-ray camera to accurately detect the relative position of the second electrode piece b and the first electrode piece a, thereby ensuring the correct relative position of the second electrode piece b and the first electrode piece a. The first composite sheet e is then further transported to the area where the winding mechanism 40 is located, thereby completing the winding of the electrode assembly 200.

[0521] The first detection device 71 is used to sequentially detect the relative positions of multiple locations in the length direction of the second pole piece b and the first pole piece a during the movement of the first composite piece e.

[0522] Specifically, the first detection device 71 can detect the positions of the head, tail, and multiple points in the middle of the length direction of the second pole piece b, and can detect the positions of the head, tail, and multiple points in the middle of the length direction of the first pole piece a. Combined with the positions of multiple parts of the second pole piece b and the first pole piece a, the relative positions of the second pole piece b and multiple parts of the length direction of the first pole piece a can be determined. For example, the relative position of the head of the second pole piece b in the length direction to the head of the first pole piece a in the length direction.

[0523] In this way, the first detection device 71 can detect the relative positions of multiple parts of the second pole piece b and the first pole piece a in the length direction, thereby improving the detection accuracy to ensure that the second pole piece b and the first pole piece a are in the correct position.

[0524] The first detection device 71 includes an X-ray camera. Specifically, the X-ray camera can detect the relative positions of multiple locations of the second pole piece b and the first pole piece a along the length direction. The X-ray camera can penetrate the diaphragm to detect the positions of multiple locations of the second pole piece b located in the inner layer.

[0525] It can be understood that the X-ray camera has high resolution and can penetrate objects to detect multiple parts, thereby improving the relative position detection accuracy of multiple parts of the second pole piece b and the first pole piece a in the length direction.

[0526] 17 and 23 to 28 , the winding apparatus 100 according to some specific implementations of the present application will be described.

[0527] Referring to Figure 17 , the first electrode sheet a, the second electrode sheet b, and the first separator c are unwound. The first electrode sheet a and the second electrode sheet b wrap the first separator c between them and are then composited together through the first polymerization mechanism 31 to form a first composite sheet e. Subsequently, the first composite sheet e passes through the sixth buffer mechanism 86 and is edge-sealed with the second separator d through the sixth polymerization mechanism 36 to form a sixth composite sheet k. The winding apparatus 100 further includes a first inspection device 71, a sixth inspection device 76, a seventh inspection device 77, an eighth inspection device 78, a ninth inspection device 791, and a tenth inspection device 792.

[0528] Exemplarily, the first electrode piece a is a cathode electrode piece, the second electrode piece b is an anode electrode piece, and in the first composite piece e, the second electrode piece b is stacked between the first diaphragm c and the second diaphragm d.

[0529] The seventh detection device 77 is installed after the cathode electrode is unwound, and is used to detect the width of the cathode back AT11, the electrode film width, and the yellow-labeled defective products, electrode metal leakage / breakage and other incoming material defects;

[0530] The ninth detection device 791 is installed after the anode electrode is unwound and is used to detect anode damage, electrode film width, yellow-labeled defective products, electrode cracking / metal leakage and other incoming material defects;

[0531] The first detection device 71 is installed behind the sixth buffer mechanism 86 and in front of the sixth polymerization mechanism 36, and is used to detect composite defects such as breakage, crushing, and wrinkling of the anode electrode after composite;

[0532] The sixth detection device 76 is installed after the sixth polymerization mechanism 36 and before the serpentine correction. The upper sixth detection device 76 is used to detect the width of the cathode electrode front AT11, the cathode and anode OH, the diaphragm and cathode OH, the diaphragm misalignment, the cathode angle and damage and other composite post-sealing defects; the lower sixth detection device 76 is used to detect the anode electrode crush, diaphragm wrinkling, edge peeling and other post-sealing defects;

[0533] The eighth detection device 78 is installed behind the third cutting mechanism 63 and in front of the winding needle 42, and is used to detect the OH on both sides of the anode-cathode package of two adjacent turns of the first composite sheet e on the winding mechanism 40 to avoid OH leakage.

[0534] The tenth detection device 792 is installed behind the third cutting mechanism 63 and in front of the winding needle 42, and is used to detect the OH on both sides of the anode and cathode of the same circle of electrode assembly 200 on the winding mechanism 40, to avoid OH leakage caused by the deviation of the pole piece or the overall material line after compounding during the winding process.

[0535] Please refer to Figure 17. The first polymerization mechanism 31 may include two composite rollers arranged opposite to each other. 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 bond the first electrode piece a, the first diaphragm c and the second electrode piece b together to achieve a composite connection of the first electrode piece a, the first diaphragm c and the second electrode piece b.

[0536] Referring to Figure 17 , the sixth polymerization mechanism 36 is located downstream of the first polymerization mechanism 31 and the fourth feeding mechanism 22. It allows the first composite sheet e formed by the first polymerization mechanism 31 and the second separator d unwound by the fourth feeding mechanism 22 to be conveyed to the sixth polymerization mechanism 36 for edge sealing, thereby obtaining a sixth composite sheet k, i.e., the unwound electrode assembly 200. Specifically, the second separator d is connected to the first separator c in the first composite sheet e. For example, the connection of the separators can be achieved by heating, pressurizing, gluing, or other methods.

[0537] The sixth polymerization mechanism 36 is used to seal the portion of the diaphragm that exceeds the edge of the second pole piece b in the width direction F2 and the length direction F3, that is, the four side edges of the diaphragm are sealed, so that the diaphragm wraps the second pole piece b more tightly, and the effect of preventing the second pole piece b from overlapping with the first pole piece a and the second pole piece b from overlapping with the shell 320 is better, which is beneficial to reducing the risk of short circuit caused by the overlap of the second pole piece b and the first pole piece a.

[0538] The sixth polymerization mechanism 36 may include four edge-sealing rollers arranged in pairs opposite to each other. The four edge-sealing rollers can heat the four edges of the diaphragm and apply a predetermined pressure along the thickness direction F1 to achieve edge-sealing connection of the two layers of diaphragm.

[0539] When the edge sealing connection is performed, the portion where the two layers of diaphragms are connected is the edge sealing. Depending on the actual needs, the edge sealing on both sides of the width direction F2 of the two layers of diaphragms can extend continuously along the material conveying direction or can extend intermittently.

[0540] 17 , the first detection device 71 is disposed downstream of the first aggregation mechanism 31 and is at least used to detect the composite state of the first composite sheet e.

[0541] The first detection device 71 can be installed on one or both sides of the material thickness direction F1 according to actual needs. For example, the first detection device 71 can be installed on both sides of the first electrode piece a in the thickness direction F1 to detect parameters and other information of the active material layer on both sides of the first electrode piece a (e.g., the cathode electrode piece); for example, the first detection device 71 can be installed on both sides of the material thickness direction F1 to detect information such as the relative position of the second electrode piece b and the first electrode piece a; for example, the first detection device 71 can be installed on one side of the first electrode piece a in the thickness direction F1 to detect defects in the first electrode piece a. The first detection device 71 can sequentially detect multiple locations in the material length direction F3 during the material movement, or it can continuously detect the material length direction F3.

[0542] The first inspection device 71 is located downstream of the f...

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 feeding mechanism, used for releasing the first pole piece; A second feeding mechanism, used for releasing the second pole piece; a third feeding mechanism, used for releasing the first diaphragm; a fourth feeding mechanism, used for releasing the second diaphragm; A first polymerization mechanism, disposed downstream of the first feeding mechanism, the second feeding mechanism and the third feeding mechanism, for polymerizing the incoming material 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 is located between the first polymerization mechanism and the winding mechanism and is used to detect the first composite sheet.

2. The winding device according to claim 1, wherein: 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.

3. The winding device according to claim 2, 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.

4. The winding device according to claim 2 or 3, 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.

5. The winding device according to claim 4, 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.

6. The winding device according to claim 4 or 5, wherein: The winding device also includes: A second detection device is located between the second polymerization mechanism and the first polymerization mechanism and is used to detect the second composite sheet.

7. The winding device according to any one of claims 4 to 6, 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.

8. The winding device according to claim 7, 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.

9. The winding device according to any one of claims 4 to 8, 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.

10. The winding device according to claim 9, wherein: The second cutting mechanism includes a cam cutter.

11. The winding device according to any one of claims 3 to 5, 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.

12. The winding device according to claim 11, 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.

13. The winding device according to claim 11 or 12, wherein: The winding device also includes: A third detection device is located between the third polymerization mechanism and the first polymerization mechanism and is used to detect the third composite sheet.

14. The winding device according to any one of claims 11 to 13, 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.

15. The winding apparatus according to claim 14, 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.

16. The winding apparatus according to claim 2, 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.

17. The winding apparatus according to claim 16, 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.

18. The winding apparatus according to claim 16, 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.

19. The winding device according to any one of claims 16 to 18, wherein: The first polymerization mechanism is a composite mechanism and is used to fixedly connect the fifth composite sheet and the first pole sheet.

20. The winding device according to any one of claims 16 to 19, wherein: The winding device also includes: A fifth detection device is located between the fifth polymerization mechanism and the first polymerization mechanism and is used to detect the fifth composite sheet.

21. The winding device according to any one of claims 16 to 20, 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.

22. The winding apparatus according to claim 21, 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.

23. The winding device according to any one of claims 16 to 22, 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.

24. The winding apparatus according to claim 23, 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.

25. The winding device according to any one of claims 2 to 24, 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.

26. The winding apparatus of claim 1, wherein: The aggregation position of the second diaphragm and the first composite sheet is located downstream of the first detection device.

27. The winding apparatus of claim 26, 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.

28. A winding apparatus according to claim 26 or 27, 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.

29. The winding apparatus of claim 28, 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.

30. The winding apparatus according to claim 28 or 29, wherein: The winding device also includes: A sixth detection device is located between the sixth polymerization mechanism and the winding mechanism and is used to detect the sixth composite sheet.

31. A winding apparatus according to any one of claims 28 to 30, 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.

32. A winding apparatus according to any one of claims 26 to 31, 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.

33. The winding apparatus of claim 31, 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.

34. A winding apparatus according to any one of claims 26 to 33, wherein: The first pole piece, the first diaphragm and the second pole piece are separately fed into the first polymerization mechanism.

35. A winding apparatus according to any one of claims 26 to 34, wherein: The fourth feeding mechanism and the first composite sheet are assembled at the winding mechanism.

36. A battery processing device, wherein: Comprising a winding device according to any one of claims 1-35.

37. A battery production line, wherein: Comprising a winding device according to any one of claims 1-35; or, comprising a battery processing device according to claim 36.

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