Winding equipment, battery processing equipment and battery production line

Abstract

The invention discloses winding equipment, battery processing equipment and a battery production line and belongs to the technical field of battery manufacturing. The winding equipment is used for producing an electrode assembly, the electrode assembly comprises a first pole piece, a second pole piece, a first diaphragm and a second diaphragm, and the winding equipment comprises 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 polymerization mechanism is used for polymerizing incoming materials at least comprising a first pole piece, a first diaphragm and a second pole piece into a first composite piece; the winding mechanism is positioned at the downstream of the first polymerization mechanism and is used for winding an incoming material at least comprising a first composite sheet to form an electrode assembly; the first detection device is located between the first polymerization mechanism and the winding mechanism and used for detecting the first composite sheet. According to the scheme, the cathode pole piece and the anode pole piece are polymerized with the diaphragm and detected before entering the winding mechanism, and then are wound by the winding mechanism, so that the problem of omission of OH is solved.

Description

[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 introduced into this application as a reference. Technical Field

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

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

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

[0006] In the first aspect, an embodiment of the present application provides a winding device for producing an electrode assembly, wherein the electrode assembly includes a first electrode sheet, a second electrode sheet, a first diaphragm and a second diaphragm, and the winding device includes: a first 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, wherein 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.

[0007] In the above technical scheme, by setting a first polymerization mechanism, the polymerization of the first electrode sheet, the second electrode sheet and the first diaphragm is completed in advance before the electrode sheet is rolled up, 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 sheet 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 sheet), wrinkling of the diaphragm head, crushing and damage of the electrode sheet, head and tail swinging, etc., thereby reducing the detection blind spots and being able to remove defective products in time, thereby helping to improve the quality of the electrode assembly.

[0008] 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 pole piece, the first diaphragm, the second pole piece and the second diaphragm into a first composite sheet.

[0009] In the above technical scheme, 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 scheme of polymerizing these four at the winding needle, it can reduce the functional requirements of the winding needle, facilitate to increase 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, so as to reduce the displacement of the electrode sheet and the diaphragm during the winding process, and improve the quality of the electrode assembly.

[0010] 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.

[0011] 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 to expose the second pole 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 liquid injection process. The risk of overlapping of the second pole piece with the first pole piece and overlapping of the second pole piece with the shell of the battery cell is effectively reduced, thereby improving the lithium plating problem.

[0012] 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.

[0013] In the above technical solution, by arranging a second polymerization mechanism upstream of the first polymerization mechanism, the first pole piece and the first diaphragm can be polymerized preferentially. The number of material layers polymerized here is relatively small, so the polymerization quality can be better controlled, and the relative position of the first pole piece and the first diaphragm, as well as the respective states of the first pole piece and the first diaphragm can be better guaranteed, thereby improving product quality.

[0014] In some embodiments, the second polymer structure is a composite structure and is used to fix the first pole piece and the first diaphragm in the second composite sheet.

[0015] 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 improve the accuracy of the relative position between the materials, thereby improving product quality.

[0016] In some embodiments, the winding device 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.

[0017] In the above technical solution, by setting 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 the second polymerization mechanism and not entering the first polymerization mechanism, so as to promptly 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.

[0018] 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.

[0019] In the above technical scheme, 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 pole piece and the first diaphragm are polymerized. The first cache mechanism can cache part of the second composite sheet when the winding needle is switched 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, pole piece 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 continuously feed and improve production efficiency.

[0020] In some embodiments, the winding device includes 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.

[0021] In the above technical solution, during the production process, the first buffer mechanism is used to buffer the material and continuously transfer the material downstream, so that the winding needle can operate without deceleration and is not affected by the operation of the first cutting mechanism upstream of the first buffer mechanism. By caching with the first buffer mechanism, the first buffer mechanism can still convey the second composite sheet to the first polymerization mechanism during the process of the first cutting mechanism cutting off the first electrode sheet, without reducing the winding needle rate, thereby improving the winding efficiency and thus improving the overall production capacity. Moreover, the first cutting mechanism can be set away from the winding mechanism in space, so as to solve the adverse effect of the cutting chips formed by cutting falling into the electrode assembly wound on the winding needle on the quality of the electrode assembly, thereby facilitating further improving the quality of the electrode assembly.

[0022] In some embodiments, the second pole piece and the second diaphragm are separately fed into the first polymerization mechanism, and 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 first polymerization mechanism.

[0023] 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.

[0024] In some embodiments, the second cutting mechanism comprises a cam cutter.

[0025] 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 deceleration, which can improve production capacity, and because the space requirement for chase cutting is eliminated, it is helpful to reduce space occupancy.

[0026] 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.

[0027] In the above technical solution, by arranging a third polymerization mechanism upstream of the first polymerization mechanism, the second pole piece and the second diaphragm can be polymerized preferentially. The number of material layers polymerized here is relatively small, so the polymerization quality can be better controlled, and the relative position of the second pole piece and the second diaphragm, as well as the respective states of the second pole piece and the second diaphragm can be better guaranteed, thereby improving product quality.

[0028] In some embodiments, the third polymerization structure is a composite structure and is used to fix the second pole piece and the second diaphragm in the third composite sheet.

[0029] 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 position between the materials, thereby improving product quality.

[0030] In some embodiments, the winding device further includes: a third detection device, which is located between the third polymerization mechanism and the first polymerization mechanism and is used to detect the third composite sheet.

[0031] 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 promptly discover defects and abnormalities of the third composite sheet, so as to facilitate timely response when problems occur in the third composite sheet, thereby reducing the negative impact on subsequent processes and improving product quality.

[0032] 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.

[0033] In the above technical solution, the second buffer mechanism can cache the third composite sheet. When there is a speed difference before and after the second buffer mechanism, the second buffer mechanism can cache and release part of the third composite sheet in time, so as to solve the problem of speed reduction or wrinkle caused by insufficient tension, and improve production capacity and product quality. In addition, the second buffer mechanism can cache part of the third composite sheet after the second pole piece and the second diaphragm are polymerized. The second buffer mechanism can cache part of the third composite sheet when the winding needle is switched or other tension is reduced, and release the cached third composite sheet when the tension is normal, so as to reduce the negative impact of the winding needle switching, pole piece cutting or other situations on the feeding of the second feeding mechanism and the fourth feeding mechanism, reduce the deceleration or shutdown of the second feeding mechanism and the fourth feeding mechanism, so that the second feeding mechanism and the fourth feeding mechanism can continue to feed and improve production efficiency.

[0034] In some embodiments, the winding device includes 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.

[0035] In the above technical solution, during the production process, the second buffer mechanism is used to buffer the material and continuously transfer the material downstream, so that the winding needle can operate without deceleration and is not affected by the operation of the second cutting mechanism upstream of the second buffer mechanism. Through the buffering of the second buffer mechanism, the second buffer mechanism can still transport the third composite sheet to the third polymerization mechanism during the process of the second cutting mechanism cutting the second electrode sheet, without reducing the winding needle rate, thereby improving the winding efficiency and thus improving the overall production capacity. Moreover, the second cutting mechanism can be set away from the winding mechanism in space, so as to solve the adverse effect of the cutting chips formed by cutting falling into the electrode assembly wound on the winding needle on the quality of the electrode assembly, which is conducive to further improving the quality of the electrode assembly.

[0036] 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.

[0037] In the above technical solution, by setting the fifth polymerization mechanism and the first polymerization mechanism, the second diaphragm, the second pole piece, the first diaphragm and the first pole piece 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 pole piece, the first diaphragm and the first pole piece 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 including the second pole piece can be formed by the fifth polymerization mechanism first, and then the first composite sheet including the first pole piece can be formed by the first polymerization mechanism. The second pole piece and the first pole piece are polymerized in succession, so that the polymerization quality of the second pole piece and the first pole piece can be controlled separately, which can help to improve the quality of the first composite sheet, so as to improve the quality of the electrode assembly.

[0038] 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.

[0039] 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 to expose the second pole piece. The gap is not easy to fold during the winding process of the electrode assembly, and it is not easy to be disturbed by holes during the injection process. The risk of overlapping the second pole piece with the first pole piece and the second pole piece with the shell of the battery cell is effectively reduced, and the lithium deposition problem is improved. 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.

[0040] In some embodiments, the fifth polymerization mechanism is a composite mechanism, and is used to fix the second pole piece in the fifth composite sheet to the first diaphragm and the second diaphragm, respectively.

[0041] 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 position between the materials, thereby improving product quality.

[0042] 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.

[0043] 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 displacement 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.

[0044] In some embodiments, the winding apparatus further includes: a fifth detection device, which is located between the fifth polymerization mechanism and the first polymerization mechanism and is used to detect the fifth composite sheet.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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 polymerization mechanism.

[0049] In the above technical solution, when the second cutting mechanism needs to slow down to cut off the second electrode sheet, the fourth buffer mechanism can release the buffered fifth composite sheet to supply the first polymerization mechanism, so that the first polymerization mechanism can continuously and uninterruptedly combine the fifth composite sheet and the first electrode sheet to form the first composite sheet without stopping, and then the winding mechanism can continuously and uninterruptedly wind the first composite sheet without stopping. In this way, the winding efficiency of the winding equipment can be improved to improve the production efficiency of the electrode assembly. Moreover, the second cutting mechanism can be set away from the winding mechanism in space to solve the adverse effect of the cutting chips formed by cutting falling into the electrode assembly wound on the winding needle on the quality of the electrode assembly, which is conducive to further improving the quality of the electrode assembly.

[0050] 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.

[0051] 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.

[0052] In some embodiments, the winding device includes 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.

[0053] In the above technical solution, when the first cutting mechanism needs to slow down to cut off the first electrode sheet, the fifth buffer mechanism can release the buffered first composite sheet to supply the winding mechanism, so that the winding mechanism can continuously and uninterruptedly wind the first composite sheet without stopping. In this way, the winding efficiency of the winding equipment can be improved to improve the production efficiency of the electrode assembly. Moreover, the first cutting mechanism can be set away from the winding mechanism in space to solve the adverse effect of the cutting chips falling into the electrode assembly wound on the winding needle on the quality of the electrode assembly, which is conducive to further improving the quality of the electrode assembly.

[0054] 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 disposed between the first polymerization mechanism and the winding mechanism.

[0055] In the above technical solution, the length of the diaphragm can be made longer than the length of the pole 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.

[0056] In some embodiments, the second membrane and the first composite sheet are bonded at a location downstream of the first detection device.

[0057] In the above technical solution, the first detection device is arranged upstream of the winding mechanism, which can more comprehensively detect the first composite sheet which is a three-in-one stack of the first pole piece, the first diaphragm and the second pole piece, thereby reducing the detection blind area and improving the detection accuracy. In addition, both sides of the first composite sheet are pole pieces. During the transmission of the first composite sheet, the friction force on both sides of the first composite sheet along its thickness direction is consistent, and when passing through the transmission roller body, it is not easy for the roller body to be detached from the pole piece.

[0058] In some embodiments, the first polymerization mechanism is a composite mechanism, and is used to fix the first pole piece and the second pole piece in the first composite sheet to the first diaphragm.

[0059] 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 beneficial to improve the accuracy of the relative position between the materials, thereby improving product quality.

[0060] 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.

[0061] In the above technical solution, by setting the sixth polymerization mechanism downstream of the first polymerization mechanism, the second diaphragm provided by the sixth polymerization mechanism can be firstly polymerized with the first composite sheet and then put into the winding mechanism together, so that the relative position of the second diaphragm and the sixth composite sheet is more reliable and not easy to move, which is conducive to improving the reliability of the second diaphragm insulating the first electrode sheet from the second electrode sheet in the electrode assembly after winding. In addition, by setting the sixth polymerization mechanism and the winding mechanism at intervals, the problem of crowded space around the winding mechanism can be avoided, and the winding equipment sets each unwinding mechanism and the winding mechanism separately, and the layout is flexible and convenient.

[0062] 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.

[0063] In the above technical solution, the first diaphragm and the second diaphragm will not separate to expose the second pole 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, which effectively reduces the risk of the second pole piece overlapping the first pole piece and the second pole piece overlapping the shell of the battery cell, and the lithium plating problem is improved.

[0064] In some embodiments, the winding device 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.

[0065] In the above technical solution, the sixth detection device is arranged between the sixth polymerization mechanism and the winding mechanism, and can comprehensively detect the state of the sixth composite sheet, and the detection result can have a high degree of accuracy. When the sixth polymerization mechanism is an edge sealing mechanism, the sixth detection device can be used to detect the edge sealing state of the sixth composite sheet, improve the reliability of the edge sealing, and enable the diaphragm to play a reliable role in limiting and protecting the second pole piece.

[0066] 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 disposed between the sixth polymerization mechanism and the winding mechanism.

[0067] In the above technical solution, the length of the diaphragm can be made longer than the length of the pole 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.

[0068] 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.

[0069] 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.

[0070] In some embodiments, 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 polymerization mechanism, and the second cutting mechanism is arranged between the second feeding mechanism and the first polymerization mechanism.

[0071] In the above technical solution, when the first electrode sheet and the second electrode sheet are cut in advance before the first polymerization mechanism, the sixth buffer mechanism can buffer and release the first composite sheet, thereby ensuring that the winding mechanism does not affect the winding of the electrode sheet when the electrode sheet is cut, which significantly improves the winding efficiency. In addition, the first cutting mechanism and the second cutting mechanism can be arranged away from the winding mechanism in space, so as to solve the adverse effect of the cutting chips falling into the electrode assembly wound on the winding needle on the quality of the electrode assembly, thereby facilitating further improving the quality of the electrode assembly.

[0072] In some embodiments, the first pole piece, the first diaphragm, and the second pole piece are separately fed into the first polymerization mechanism.

[0073] 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.

[0074] In some embodiments, the fourth feeding mechanism and the first composite sheet are combined at the winding mechanism.

[0075] 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.

[0076] In a second aspect, an embodiment of the present application provides a battery processing device, including a winding device.

[0077] The battery processing equipment provided in the embodiment of the present application, by adopting the winding equipment involved in the above embodiments, can improve the layout rationality of the winding equipment, so as to improve 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, so as to improve the quality of the battery.

[0078] In a third aspect, an embodiment of the present application provides a battery production line, including a winding device or a battery processing device.

[0079] 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, so as to improve 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 to improve the quality of the battery.

[0080] 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

[0081] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0082] Figure 1 A schematic diagram of a battery provided for some embodiments of the present application;

[0083] Figure 2 A schematic diagram of a battery cell provided for some embodiments of the present application;

[0084] Figure 3 A schematic diagram of an electrode assembly provided for some embodiments of the present application;

[0085] Figure 4 A schematic diagram of a winding device provided for some embodiments of the present application;

[0086] Figure 5 A schematic diagram of a winding device provided for some embodiments of the present application;

[0087] Figure 6 A detection schematic diagram of a first detection mechanism provided in some embodiments of the present application;

[0088] Figure 7 A detection schematic diagram of a first detection mechanism provided in some embodiments of the present application;

[0089] Figure 8 A detection schematic diagram of a second detection mechanism provided in some embodiments of the present application;

[0090] Fig. 9 A detection schematic diagram of a second detection mechanism provided in some embodiments of the present application;

[0091] Fig.10 A schematic diagram of a winding device provided for some embodiments of the present application;

[0092] Fig.11 A schematic diagram of a winding device provided for some embodiments of the present application;

[0093] Fig.12 A schematic diagram of a winding device provided for some embodiments of the present application;

[0094] Fig.13 for Fig.12 A partial enlarged view of

[0095] Fig.14 A schematic diagram of a winding device provided for some embodiments of the present application;

[0096] Fig.15 A schematic diagram of a winding device provided for some embodiments of the present application;

[0097] Fig.16 A schematic diagram of a winding device provided for some embodiments of the present application;

[0098] Fig.17 A schematic diagram of a winding device provided for some embodiments of the present application;

[0099] Fig.18A schematic diagram of a winding device provided for some embodiments of the present application;

[0100] Fig.19 A schematic diagram of a winding device provided for some embodiments of the present application;

[0101] Fig. 20 A schematic diagram of a winding device provided for some embodiments of the present application;

[0102] Fig.21 A schematic diagram of a winding device provided for some embodiments of the present application;

[0103] Fig. 22 A schematic diagram of a winding mechanism provided in some embodiments of the present application;

[0104] Fig.23 A detection schematic diagram of a seventh detection device provided in some embodiments of the present application;

[0105] Fig.24 A detection schematic diagram of a tenth detection device provided in some embodiments of the present application;

[0106] Fig.25 A schematic diagram of a first composite sheet provided in some embodiments of the present application;

[0107] Fig.26 A detection schematic diagram of a sixth detection device provided in some embodiments of the present application;

[0108] Fig. 27 A detection schematic diagram of an eighth detection device provided in some embodiments of the present application;

[0109] Fig.28 A detection schematic diagram of an eighth detection device provided in some embodiments of the present application;

[0110] Fig.29 A schematic diagram of a battery production line provided for some embodiments of the present application.

[0111] Reference numerals:

[0112] Battery production line 1000; Battery processing equipment 1001;

[0113] Winding device 100; assembly device 400; stacking device 500;

[0114] First device 101; second device 102;

[0115] A first feeding mechanism 11; a second feeding mechanism 12; a first conveyor belt 14; a second conveyor belt 15;

[0116] A third feeding mechanism 21; a fourth feeding mechanism 22;

[0117] The first polymerization mechanism 31; the first composite roller 311 of the mechanism 1; the second composite roller 312 of the mechanism 1; the first composite gap 313; the second polymerization mechanism 32; the third polymerization mechanism 33; the fourth polymerization mechanism 34;

[0118] The fifth polymerization mechanism 35; the first composite roller of the mechanism five 351; the second composite roller of the mechanism five 352; the fifth composite gap 353; the sixth polymerization mechanism 36;

[0119] Winding mechanism 40; turret 41; station 401; winding station 4101; finishing station 4102;

[0120] Gluing station 4103; unloading station 4104; retracting station 4105; winding needle 42;

[0121] Finishing assembly 43; finishing roller 431; rubber-applying roller 432;

[0122] Feeding mechanism 50; clamping jaw 51; platform 52;

[0123] First cutting mechanism 61; first cutting knife 611; first abutting member 612;

[0124] The second cutting mechanism 62; the first cam cutter 621; the second abutting member 622;

[0125] The third cutting mechanism 63; the second cam cutter 631; the third abutting member 632;

[0126] A first deviation correcting device 66; a second deviation correcting device 67; a third deviation correcting device 68;

[0127] A first detection device 71; a second detection device 72; a third detection device 73;

[0128] Fifth detection device 75; sixth detection device 76; detector one 761; detector two 762;

[0129] Seventh detection device 77; eighth detection device 78; ninth detection device 791; tenth detection device 792;

[0130] A first buffer mechanism 81; a first fixed roller 811; a first floating roller 812;

[0131] A second cache mechanism 82;

[0132] Fourth buffer mechanism 84; fourth fixed roller 841; fourth floating roller 842;

[0133] Fifth buffer mechanism 85; fifth fixed roller 851; fifth floating roller 852;

[0134] Sixth buffer mechanism 86; sixth fixed roller 861; sixth floating roller 862;

[0135] A first transmission member 91; a second transmission member 92; a third transmission member 93;

[0136] A fourth transmission member 94; a fifth transmission member 95; a sixth transmission member 96;

[0137] First insert feeding mechanism 97; second insert feeding mechanism 98;

[0138] Electrode assembly 200;

[0139] First pole piece a; second pole piece b; first diaphragm c; second diaphragm d;

[0140] The first composite sheet e; the second composite sheet f; the third composite sheet g;

[0141] The fourth composite sheet h; the fifth composite sheet j; the sixth composite sheet k; the seventh composite sheet m;

[0142] Battery 300 ; battery cell 301 ; housing 3011 . DETAILED DESCRIPTION

[0143] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0144] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0145] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0146] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0147] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0148] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0149] The term "plurality" used in the present application refers to two or more (including two).

[0150] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of battery application fields, its market demand is also constantly expanding.

[0151] The battery cell includes an electrode assembly, which includes a cathode electrode sheet, an anode electrode sheet and a separator. In the related art, when the electrode assembly is produced by winding equipment, the cathode electrode sheet, the anode electrode sheet and the separator are fed into the winding mechanism separately, and a detector is set at the winding mechanism to obtain the offset between each layer. However, this method is prone to OH (overhang) leakage.

[0152] Based on this, the present application proposes a winding device, in which the cathode electrode sheet and the anode electrode sheet are first polymerized with the diaphragm and tested before entering the winding mechanism, and then wound by the winding mechanism, thereby solving the OH leakage problem.

[0153] The winding equipment of the embodiment of the present application is used to produce electrode assemblies, and the electrode assemblies can be used for battery cells, and the battery cells can be used for batteries. The electrical equipment may include a battery cell or a battery in any of the following embodiments. Specifically, the electrical equipment may use a battery or a battery cell as a power source, and the electrical equipment may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, electric airplane toys, and the like, and spacecraft may include airplanes, rockets, space shuttles, spacecrafts, and the like.

[0154] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0155] Reference Figure 1 and Figure 2 The vehicle is provided with a battery 300 inside, and the battery 300 can be provided at the bottom, head or tail of the vehicle. The battery 300 can be used to power the vehicle, for example, the battery 300 can be used as an operating power source for the vehicle. The vehicle can also include a controller and a motor, and the controller is used to control the battery 300 to power the motor, for example, for starting, navigating and driving the vehicle.

[0156] In the embodiment of the present application, the battery 300 can not only be used as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0157] In the implementation mode of this application, Figure 1 As shown, the battery 300 refers to a single physical module including 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, etc. Some batteries 300 may include a box for encapsulating one or more battery cells 301 or multiple battery modules. The box can prevent liquid 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 box and are directly set in the battery installation compartment of the electrical device.

[0158] 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, etc., 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.

[0159] For example, Figure 2 As shown, the 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 .

[0160] For example, Figure 3 As shown, the electrode assembly 200 is a component in the battery cell 301 where electrochemical reactions occur. The electrode assembly 200 includes a stacked multilayer material, such as a first pole piece a, a second pole piece b, a first diaphragm c, and a second diaphragm d. The battery cell 301 mainly works by moving metal ions between the first pole piece a and the second pole piece b. One of the first pole piece a and the second pole piece b is a cathode pole piece, and the other is an anode pole piece.

[0161] The cathode plate 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 tab of the cathode plate. Taking lithium-ion batteries as an example, the material of the cathode current collector can be aluminum, and the cathode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0162] 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 pole ear of the anode plate. The material of the anode current collector can be copper, and the anode active material can be carbon or silicon, etc.

[0163] In order to ensure that a large current does not melt, the cathode electrode has multiple tabs stacked together, and the anode electrode has multiple tabs stacked together. The material of the diaphragm (first diaphragm c, second diaphragm d) can be PP (polypropylene) or PE (polyethylene).

[0164] 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.

[0165] like Figure 3 and Figure 4As shown, the winding device 100 is used to produce an electrode assembly 200, and the electrode assembly 200 includes a first electrode sheet a, a second electrode sheet b, a first diaphragm c and a second diaphragm d. The winding device 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 diaphragm c; and the fourth feeding mechanism 22 is used to release the second diaphragm d.

[0166] The second pole piece b has a different polarity from the first pole piece a. One of the first pole piece a and the second pole piece b is an anode pole piece, and the other is a cathode pole piece. The first pole piece a can be an anode pole piece or a cathode pole piece; the second pole piece b can be an anode pole piece or a cathode pole piece. For example, the first pole piece a is an anode pole piece, and the second pole piece b is a cathode pole piece. For another example, the first pole piece a is a cathode pole piece, and the second pole piece b is an anode pole piece.

[0167] 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 materials in a wound state and are used to release the materials in a wound state in the form of a strip. Exemplarily, the unwinding mechanism can be, but is not limited to, structures such as a roller, a reel, a drum, and a rotating shaft. The specific design and features of the unwinding mechanism can be set according to the width and thickness of the strip material. Among them, the material can be pre-wound and directly placed on the unwinding mechanism, or it can be wound in real time by the unwinding mechanism.

[0168] Exemplarily, the unwinding mechanism can be rotated to wind and release the strip material. For example, the unwinding mechanism can be an active mechanism, that is, the rotation of the unwinding mechanism can be actively driven by a motor, a hydraulic system, or a pneumatic system. Or, for example, the unwinding mechanism can also be a passive mechanism, such as being able to rotate by pulling the winding mechanism 40 described later, so that the material is released in the form of a strip.

[0169] 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 a plurality of them allows multiple unwinding mechanisms to be used alternately to achieve continuous unwinding operations and improve production efficiency.

[0170] Exemplarily, the first feeding mechanism 11 is used for winding the first pole piece a and releasing the first pole piece a. For example, the first feeding mechanism 11 can rotate, so that the first feeding mechanism 11 can rotate and deliver the first pole 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 pole 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 pole piece a, thereby improving production efficiency.

[0171] Exemplarily, the second feeding mechanism 12 is used for winding the second pole piece b and releasing the second pole piece b. For example, the second feeding mechanism 12 can rotate, so that the second feeding mechanism 12 can rotate and deliver the second pole piece b wound thereon to a subsequent mechanism. For example, the shape of the second feeding mechanism 12 can be cylindrical, or 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 pole 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 pole piece b, thereby improving production efficiency.

[0172] Exemplarily, the third feeding mechanism 21 is used for winding the first diaphragm c 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 deliver the first diaphragm c wound thereon to a subsequent mechanism. For example, the shape of the third feeding mechanism 21 can be cylindrical, or 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.

[0173] Exemplarily, the fourth feeding mechanism 22 is used for winding the second diaphragm d and releasing the second diaphragm d. For example, the fourth feeding mechanism 22 can be rotatable, so that the fourth feeding mechanism 22 can rotate and deliver the second diaphragm d wound thereon to a subsequent mechanism. For example, the shape of the fourth feeding mechanism 22 can be cylindrical, or 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.

[0174] like Figure 4As shown, 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 rotation. Exemplarily, the rotation of the winding needle 42 can be driven to rotate by a motor, a hydraulic system, a pneumatic system, etc. Exemplarily, the shape of the winding needle 42 can be a regular shape such as a cylinder, a cone, or an irregular shape. Among them, according to the different shapes of the winding needle 42, the electrode assembly 200 obtained by winding can present different shapes.

[0175] like Figure 4 As shown, the winding device 100 further includes a first polymerization mechanism 31, which is disposed 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 the incoming materials including at least the first electrode sheet a, the first separator c, and the second electrode sheet b into a first composite sheet e. The winding mechanism 40 is located downstream of the first polymerization mechanism 31, and winds the incoming materials including at least the first composite sheet e to form the electrode assembly 200.

[0176] Among them, “the first feeding mechanism 11, the second feeding mechanism 12 and the third feeding mechanism 21 are arranged upstream of the first polymerization 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 polymerization mechanism 31.

[0177] For example, the first feeding mechanism 11, the second feeding mechanism 12 and the third feeding mechanism 21 may be arranged upstream of the first polymerization mechanism 31, while the fourth feeding mechanism 22 is not arranged 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 arranged upstream of the first polymerization mechanism 31.

[0178] 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 be used 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 be used 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 be used 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 be used as the input material of the first polymerization mechanism 31.

[0179] Exemplarily, when the first feeding mechanism 11, the second feeding mechanism 12 and the third feeding mechanism 21 are arranged upstream of the first polymerization mechanism 31, and the fourth feeding mechanism 22 is not arranged upstream of the first polymerization mechanism 31, the incoming materials of the first polymerization mechanism 31 include the first pole piece a, the second pole piece b and the first diaphragm c. At this time, the first polymerization mechanism 31 can aggregate the first pole piece a, the first diaphragm c and the second pole piece b into a first composite sheet e. At this time, the first composite sheet e can be defined as a three-in-one composite sheet, in which the first diaphragm c is stacked between the first pole piece a and the second pole piece b. At this time, the winding mechanism 40 is located downstream of the first polymerization mechanism 31, and the first composite sheet e and the second diaphragm d can be wound to form the electrode assembly 200.

[0180] Exemplarily, when the first feeding mechanism 11, the second feeding mechanism 12, the third feeding mechanism 21 and the fourth feeding mechanism 22 are provided upstream of the first polymerization mechanism 31, the incoming materials of the first polymerization mechanism 31 include the first pole piece a, the second pole piece b, the first diaphragm c and the second diaphragm d. At this time, the first polymerization mechanism 31 can polymerize the first pole piece a, the first diaphragm c, the second pole piece b and the second diaphragm d into a first composite sheet e. At this time, the first composite sheet e can be defined as a four-in-one composite sheet, in which the first diaphragm c is stacked between the first pole piece a and the second pole piece b, and the second pole piece b is stacked between the second diaphragm d and the first diaphragm c. At this time, 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.

[0181] Of course, the first composite sheet e can also be designed as the first pole sheet a stacked between the second diaphragm d and the first diaphragm c. To simplify the description, the following mainly takes the second pole sheet b stacked between the second diaphragm d and the first diaphragm c as an example.

[0182] 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.

[0183] It is worth noting that the "polymerization" mentioned 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 may include only stacking without connection between different layers, or it may include a composite connection between the pole piece and the diaphragm, or it may also include edge sealing connection between diaphragms, etc.

[0184] For example, the first polymerization mechanism 31 is to understand the "polymerization" in the polymerization of the incoming material into the first composite sheet e in a broad sense, for example, the material may be simply stacked and merged in sequence along the thickness direction, or the material may be not only stacked and merged together, but also the related layers may be connected in an inseparable manner. The connection relationship may include the above-mentioned composite connection, edge sealing connection, etc. The composite connection and edge sealing connection are not limited in method, for example, they may be formed by cold pressing, hot pressing, gluing, etc.

[0185] For example, in the above three-in-one composite sheet polymerized by the first polymerization mechanism 31, the first electrode piece a and the first diaphragm c may only be in contact but not connected, or they may both be in contact and connected, that is, the first electrode piece a and the first diaphragm c are partially connected, or are in an inseparable state of overall connection, or are in a non-connected bonding state. Similarly, the second electrode piece b and the first diaphragm c may only be in contact but not connected, or they may both be in contact and connected, that is, the second electrode piece b and the first diaphragm c are partially connected, or are in an inseparable state of overall connection, or are in a non-connected bonding state.

[0186] 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 only be in contact but not connected, or they may both be in contact and connected, so that 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 only be in contact but not connected, or they may both be in contact and connected, so that 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 only be in contact but not connected, or they may both be in contact and connected, so that 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 not be connected, may be continuously connected, or may be intermittently connected.

[0187] Combination Figure 4 The winding device 100 further includes a first detection device 71, which is located between the first polymerization mechanism 31 and the winding mechanism 40 and is used to detect the first composite sheet e.

[0188] 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 workstations, that is, the first composite sheet e formed by the polymerization of the first polymerization mechanism 31 can be inspected by the first detection device 71 before entering the winding mechanism 40.

[0189] Exemplarily, the first detection device 71 may include a camera, a machine vision detection device or other structures. Exemplarily, the first detection device 71 may also include other devices such as a control device. The first detection device 71 may obtain image information (such as position, color, shape, etc.) of the relative first composite sheet e, and may convert the image information into a digital signal and send it 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.

[0190] Therefore, by setting the first detection device 71 between the first polymerization mechanism 31 and the winding mechanism 40, the first composite sheet e can be detected, so that the quality of the first composite sheet e can be obtained. Specifically, the first detection device 71 is set at this position 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 that has passed; because the composite first composite sheet e will enter the winding needle 42 for winding, the head end of the first composite sheet e will not be easy to detect after entering the winding needle 42, and because the positions of the pole piece and the diaphragm in the first composite sheet e after polymerization are relatively stable, it is not easy to be displaced or misaligned, so the state of the first composite sheet e detected by the first detection device 71 located between the first polymerization mechanism 31 and the winding mechanism 40 is smaller or the same as the state of the first composite sheet e after winding, and the result of the first detection device 71 detection can have a higher accuracy, and the detection of the first composite sheet e is more comprehensive.

[0191] Since the current stacking of the pole piece and the diaphragm is usually carried out at the winding needle, the head end of the pole piece and the diaphragm entering the winding needle is not easy to be detected by the detection equipment, which is prone to OH leakage (overhang, the excess part, can be OH between the positive and negative pole pieces, or OH between the diaphragm and the pole piece), pole piece corner crushing and other 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. The positions of the pole piece and the diaphragm in the first composite sheet e after polymerization by the first polymerization mechanism 31 are relatively fixed and not easy to shift. After the first detection device 71 detects, the structure of the first composite sheet e is not easy to change, and the detection result is relatively accurate. At the same time, the first detection device 71 is arranged upstream of the winding mechanism 40, so that the first detection device 71 can detect the first composite sheet e more comprehensively, reducing the area of ​​dead angles or undetectable parts, and improving the accuracy of detection. This avoids the situation where defects of the first pole piece a, the first diaphragm c, the second pole 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.

[0192] For example, the detection function of the first detection device 71 may include, but is not limited to, at least one of the following.

[0193] 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 coated, 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 in the width direction exceeding the two side edges of the cathode electrode piece active material area), 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 precipitation problem. Exemplarily, in the formed first composite sheet e, the length and width of the anode electrode piece are both greater than the cathode electrode piece, so that the anode electrode piece can cover the cathode electrode piece.

[0194] 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.

[0195] 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 sheet has a folded corner, whether the electrode sheet is damaged, the width of the active material layer of the electrode sheet, and known defective electrode sheets (such as defective products with yellow labels, etc.).

[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 state of the first diaphragm c in the first composite sheet e, such as diaphragm wrinkling, diaphragm folding, and diaphragm damage.

[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 whether the first composite sheet e has a head swing or tail swing problem. At the cutting point of the pole piece, the pole piece is prone to swing, and 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".

[0198] In the related art, the winding equipment winds the first pole piece, the first diaphragm, the second pole 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, so that there is a blind spot in the detection of the electrode assembly, and it is difficult to detect the problem of pole piece head and tail swinging.

[0199] Therefore, the winding device 100 provided in the embodiment of the present application, by setting the first polymerization mechanism 31, completes the polymerization of the first electrode sheet a, the second electrode sheet b and the first diaphragm c before the electrode sheet is wound, and by setting the first detection device 71, before the first composite sheet e enters the winding mechanism 40, the first composite sheet e is detected in all directions, so as to timely discover possible defects in the electrode sheet and the diaphragm, such as OH leakage (OH between the cathode and anode electrodes, or OH between the diaphragm and the electrode sheet), wrinkling of the diaphragm head, crushing and damage of the electrode sheet, head shaking and tail shaking, etc., thereby reducing the detection blind spots and being able to timely remove defective products, thereby helping to improve the quality of the electrode assembly 200.

[0200] 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 in different material lines together. The two pole pieces will be respectively transferred to the winding needle of the winding mechanism. The two pole pieces need to maintain a certain relative position, otherwise it is easy to cause poor lithium precipitation. Specifically, the two pole pieces are offset in the length or width direction. Lithium ions are not transferred from one pole piece to another, but are precipitated in the area outside the pole piece, thereby generating lithium crystals, resulting in punctures, cuts and other defects in the electrode assembly formed by the pole piece, which in turn leads to safety risks in 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 vision and a problem of missed detection. Moreover, the two pole pieces have free ends, which is specifically manifested in that the two pole pieces are not offset before entering the winding needle, and the two pole pieces are offset after entering the winding needle. Therefore, at the beginning of winding, the detection of the relative position between the two pole pieces is inaccurate.

[0201] In the embodiment of the present application, the first polymerization mechanism 31 in the winding device 100 polymerizes the second pole piece b, the first pole piece a and the diaphragm before the winding needle 42 to form a flattened first composite sheet e. Since the first composite sheet e is in a flattened state and is not wound, the relative positions of the second pole piece b and the first pole piece a are relatively stable, so that the first detection device 71 can accurately and easily detect the relative position between the second pole piece b and the first pole piece a, and there is no blind spot for shooting. The head, middle and tail of the entire first composite sheet e can be photographed, so that the relative positions of the second pole piece b and the first pole piece a are correct, and there is no head and tail OH leakage, which helps to improve the quality of the electrode assembly 200.

[0202] Moreover, by providing the first polymerization mechanism 31 and the winding mechanism 40, at least the second electrode sheet b, the first diaphragm c and the first electrode sheet a are sequentially stacked and polymerized by the first polymerization mechanism 31 to form the first composite sheet e, and then are wound by the winding mechanism 40 to form the electrode assembly 200. In this way, the polymerization operation of at least the second electrode sheet b, the first diaphragm c and the first electrode sheet a is separately provided from the winding operation of the winding mechanism 40, so that it is not necessary to concentrate the polymerization of the second electrode sheet b, the first diaphragm c and the first electrode sheet a at the winding needle 42 of the winding mechanism 40, so that at least the first feeding mechanism 11, the second feeding mechanism 12, the third feeding mechanism 21 and the winding mechanism 40 can have a larger space, so as to improve the rationality of the layout of the winding device 100, facilitate the layout of various functional devices and mechanisms, such as facilitating the layout of the above-mentioned first detection device 71, etc., and thus help to improve the quality of the electrode assembly 200.

[0203] Combination Figure 4 In some embodiments, the winding device 100 further includes a first cutting mechanism 61 for cutting off the first electrode sheet a and a second cutting mechanism 62 for cutting off the second electrode sheet b. Exemplarily, when a first polymerization mechanism 31 is provided upstream of the winding mechanism 40, both the first cutting mechanism 61 and the second cutting mechanism 62 may be provided upstream of the first polymerization mechanism 31. For example, the first cutting mechanism 61 may be provided between the first feeding mechanism 11 and the first polymerization mechanism 31, and the second cutting mechanism 62 may be provided between the second feeding mechanism 12 and the first polymerization mechanism 31. Thus, both the first cutting mechanism 61 and the second cutting mechanism 62 may be provided spatially away from the winding mechanism 40, so as to solve the adverse effect of the cutting chips formed by cutting and falling into the electrode assembly 200 wound on the winding needle 42 on the quality of the electrode assembly 200, thereby facilitating further improving the quality of the electrode assembly 200.

[0204] Combination Figure 4In some embodiments, the winding device 100 further includes a third cutting mechanism 63, which is used to cut the diaphragm. Since the first diaphragm c and the second diaphragm d are both supplied in continuous coils, after the first diaphragm c and the second diaphragm d are aggregated with the first pole piece a and the second pole piece b, the third cutting mechanism 63 is required to cut the first diaphragm c and the second diaphragm d.

[0205] The number of the third cutting mechanism 63 is not limited, for example, it can be one or two. For example, when the number of the third cutting mechanism 63 is one, the third cutting mechanism 63 can cut the first diaphragm c and the second diaphragm d at the same time; for another example, when the number of the third cutting mechanism 63 is at least two, 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.

[0206] Exemplarily, when the first detection device 71 is disposed between the first polymerization mechanism 31 and the winding mechanism 40, the specific position of the third cutting mechanism 63 can be flexibly set. For example, the first detection device 71 can be disposed between the first polymerization mechanism 31 and the third cutting mechanism 63 (combined with Figure 4 and Figure 5 ), or, the first detection device 71 may be disposed between the third cutting mechanism 63 and the winding mechanism 40.

[0207] Combination 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 materials 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.

[0208] 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 be used as the input material of the first polymerization mechanism 31. Exemplarily, the first polymerization mechanism 31 can aggregate the first pole piece a, the first diaphragm c, the second pole 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 which the first diaphragm c is stacked between the first pole piece a and the second pole piece b, and the second diaphragm d is stacked on the side of the first pole piece a or the second pole piece b away from the first diaphragm c.

[0209] To simplify the description, the following text takes the second pole piece b in the first composite sheet e stacked between the first diaphragm c and the second diaphragm d as an example for explanation. Of course, the first pole piece a can also be stacked between the first diaphragm c and the second diaphragm d. Exemplarily, the first composite sheet e is stacked in the order of the first pole piece a, the first diaphragm c, the second pole piece b and the second diaphragm d, the second pole piece b is stacked between the first diaphragm c and the second diaphragm d, and the first diaphragm c is stacked between the first pole piece a and the second pole piece b, the first pole piece a is a cathode pole piece, and the second pole piece b is an anode pole piece.

[0210] The first pole piece a, the second pole piece b, the first diaphragm c and the second diaphragm d are all sheet-like structures and have thickness. For example, the second diaphragm d, the second pole piece b, the first diaphragm c and the first pole piece a are stacked in sequence, which means that the second diaphragm d, the second pole piece b, the first diaphragm c and the first pole piece a are stacked in sequence along the thickness direction of the pole pieces, and at this time, the thickness direction of the second diaphragm d, the thickness direction of the second pole piece b, the thickness direction of the first diaphragm c and the thickness direction of the first pole piece a are parallel.

[0211] 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 achieve 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 achieve insulation between the second electrode sheet b and the first electrode sheet a.

[0212] 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 71 for detecting the relative position of the second electrode piece b and the first electrode piece a in the first composite sheet e, for detecting the relative position of the first diaphragm c and the electrode piece in the first composite sheet e, 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 state of the electrode piece a), detecting the state 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 state 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. More types of detectable information can be used to more fully avoid the problem of defect omission, and unqualified products can be eliminated in time, thereby improving the quality of the electrode assembly 200.

[0213] Moreover, the first polymerization mechanism 31 can polymerize at least the first electrode piece a, the first diaphragm c, the second electrode piece b and the second diaphragm d to obtain the first composite piece e. Compared with the solution of polymerizing these four at the winding needle 42, the functional requirements of the winding needle 42 can be reduced, which is convenient for increasing the winding speed of the winding needle 42 and improving production efficiency. Moreover, the polymerization of the electrode piece and the diaphragm can be completed before winding to reduce the displacement of the electrode piece and the diaphragm during the winding process and improve the quality of the electrode assembly 200.

[0214] Combination Figure 4 and Figure 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, and the first polymerization mechanism 31 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.

[0215] 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), wherein the edge sealing of the two diaphragms on the pole ear side can be continuous edge sealing or intermittent edge sealing to avoid 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.

[0216] Combination Figure 6 For the electrode assembly 200, the material conveying direction of the second electrode piece b, the first electrode piece a, the first diaphragm c, and the second diaphragm d refers to the direction of travel of each material in the production process, that is, the length direction of each material in the electrode assembly 200; the thickness direction F1 of the second electrode piece b, the first electrode piece a, the first diaphragm c, and the second diaphragm d refers to the direction of the smallest material size, that is, the stacking direction of each material in the electrode assembly 200; the width direction F2 of the second electrode piece b, the first electrode piece a, the first diaphragm c, and the second diaphragm d refers to the direction perpendicular to the thickness direction F1 and the material conveying direction. During the winding process of the electrode assembly 200, the winding axis is generally parallel to the width direction F2.

[0217] 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 can seal the portion of the first diaphragm c that exceeds the edge of the second electrode piece b in the width direction F2 and the portion of the second diaphragm d that exceeds 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. According to 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, which is within the protection scope of this application.

[0218] For example Figure 6 The portion of the second diaphragm d that exceeds the left edge of the second pole piece b shown in FIG. 1 is connected to the portion of the first diaphragm c that exceeds the left edge of the second pole piece b to achieve left side sealing; for example Figure 6 The portion of the second diaphragm d that exceeds the right edge of the second pole piece b shown in the figure is connected to the portion of the first diaphragm c that exceeds the right edge of the second pole piece b to achieve right side sealing; the left side sealing and the right side sealing can be set at the same time, or only one of them can be set.

[0219] 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 to expose the second pole piece b. 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. The risk of overlapping of the second pole piece b with the first pole piece a and overlapping of the second pole piece b with the shell 3011 of the battery cell 301 is effectively reduced, and the lithium plating problem is improved.

[0220] For example, in combination Figure 5 The edge sealing mechanism may include two edge sealing rollers arranged opposite to each other, and the two edge sealing rollers can heat the edges of 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.

[0221] For example, in combination Figure 4 The first aggregation mechanism 31 may include two rollers that are relatively spaced apart from each other, or may include a roller and a support that is 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 be an active roller or a passive roller.

[0222] Combination Figure 5-Figure 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.

[0223] The first detection device 71 is arranged 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 as to use the first detection device 71 to detect the state of the formed edge sealing. For example, edge sealing defects such as the folded angle of the pole piece, the wrinkles of the first diaphragm c and the second diaphragm d, edge sealing failure, edge sealing misalignment, edge sealing size, grayscale difference, etc. 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 as to adjust the first diaphragm c, the second diaphragm d and the edge sealing mechanism according to the detection results, so that the width of the formed edge sealing is 0.5mm~1mm, and the edge sealing is generally in the middle of the part where the first diaphragm c and the second diaphragm d exceed the edge of the second pole piece b, thereby improving the reliability of the edge sealing, and the first diaphragm c and the second diaphragm d can reliably limit and protect the second pole piece b. For example Figure 6 and Figure 7 As shown, 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 pole piece b and the first pole piece a.

[0224] The first detection device 71 may adopt a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different detection devices may be the same or different. For example, the first detection device 71 may include a CCD. CCD can obtain an optical image of the material to achieve detection. Furthermore, 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, 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.

[0225] 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.

[0226] Combination Figure 4 and Figure 5In some embodiments, when the fourth feeding mechanism 22 is disposed upstream of the first polymerization mechanism 31, the first electrode piece a and the first diaphragm c can be polymerized first. For example, the winding device 100 may further include a second polymerization mechanism 32, the second polymerization mechanism 32 is located upstream of the first polymerization mechanism 31, and the second polymerization mechanism 32 is located downstream of the first feeding mechanism 11 and the third feeding mechanism 21, and the second polymerization mechanism 32 is used to polymerize the first electrode piece a and the first diaphragm c into a second composite sheet f.

[0227] 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 be transported 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, and the first electrode a and the first diaphragm c in the second composite sheet f can be only in contact but not connected, or can be both 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 unconnected bonding state.

[0228] Therefore, by setting the second polymerization mechanism 32 upstream of the first polymerization mechanism 31, the first pole piece 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 pole piece a and the first diaphragm c, as well as the respective states of the first pole piece a and the first diaphragm c can be better guaranteed, thereby improving product quality.

[0229] 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.

[0230] For example, combined with Figure 4 and Figure 5 The second polymerization mechanism 32 is a composite mechanism, and is used to fix the first pole piece a in the second composite sheet f to the first diaphragm c. This reduces the displacement of the first pole piece a relative to the first diaphragm c during winding and use, which is beneficial to improve the accuracy of the relative position between the materials, thereby improving product quality. Among them, the fixed connection method 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.

[0231] For example, in combination Figure 4The second polymerization mechanism 32 can press the first electrode piece a onto the first diaphragm c by pressure, or can make the first electrode piece a fit onto the first diaphragm c by gluing or other methods. For example, the second polymerization mechanism 32 can include two rollers arranged relatively at intervals, or can include a roller and a support arranged relatively at intervals with the roller, or can include multiple rollers or other structures; the roller in the second polymerization mechanism 32 can be a rotatable structure, or a fixed structure, or can be floating; the roller in the second polymerization mechanism 32 can also be an active roller or a passive roller.

[0232] For example, in combination Figure 5 The second polymerization mechanism 32 can compound the first pole piece a with the first diaphragm c, that is, the first pole piece a and the first diaphragm c are connected together, for example, the connection can be achieved by heating, pressurizing, etc., reducing the displacement of the first pole piece a relative to the first diaphragm c during winding and use, which is conducive to improving the accuracy of the relative position between the materials. For example, the compounding mechanism may include two compounding rollers arranged opposite to each other, and the two compounding rollers can heat the first pole piece a and the first diaphragm c and apply a predetermined pressure along the thickness direction F1, so that the first pole piece a and the first diaphragm c are bonded together, and the first pole piece a and the first diaphragm c are compositely connected.

[0233] 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 pole piece a and the first diaphragm c in the second composite sheet f together without connecting them.

[0234] Combination Figure 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.

[0235] 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 be inspected by the second detection device 72 before entering the first polymerization mechanism 31.

[0236] Combination Figure 4The second detection device 72 is disposed between the second polymerization mechanism 32 and the first polymerization mechanism 31, and is used to detect 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 may obtain image information (such as position, color, shape, etc.) of the relative second composite sheet f, and may convert the image information into a digital signal and send it to the control device, so that the control device may determine whether the second composite sheet f meets the requirements according to a preset program.

[0237] Combination Figure 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 the second polymerization mechanism 32 and not entering the first polymerization mechanism 31, so as to promptly discover the defects and abnormalities of 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.

[0238] Combination Figure 5 , exemplarily, the second detection device 72 is used to detect the relative position of the first diaphragm c and the first pole 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 pole piece a, "the OH of the first diaphragm c exceeding the first pole piece a" means that the edge of the first diaphragm c exceeds the edge of the active material area of ​​the first pole piece a in the width direction of the pole piece, and the OH defect means that the size of the exceeding part does not meet the required size range.

[0239] For example, in combination Figure 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.

[0240] For example, combining Figure 5 , Figure 8 and Fig. 9 As shown, a second detection device 72 is provided on one side of the second composite sheet f in the thickness direction F1 to detect information such as defects of the second composite sheet f. The second detection device 72 can detect multiple locations in the length direction of the material in sequence during the material movement, or can continuously detect the material in the length direction.

[0241] The second detection device 72 can be 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 second detection device 72 can include a linear array camera or a planar array camera, wherein the image acquisition range of the linear array camera is narrow but the acquisition accuracy is high, so Figure 8 As shown in FIG. 1 , a linear array camera can be set on both sides of the material width direction F2 to improve the detection accuracy; the image acquisition range of the area array camera is larger but the acquisition accuracy is lower, so Fig. 9 As shown, an area array camera can be arranged in the middle of the material width direction F2 to reduce costs.

[0242] 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 the composite state are detected by the first detection device 71 and the second detection device 72 respectively, so as to achieve more comprehensive detection, wherein the second detection device 72 can detect whether the relative position of the first pole piece a and the first diaphragm c before the edge sealing of the first diaphragm c and the second diaphragm d is accurate, thereby improving the position accuracy of the first diaphragm c and the first pole piece a, and the two sides of the first diaphragm c in the width direction F2 can exceed the edge of the first pole piece a by a sufficient size, so as to provide sufficient space for edge sealing, thereby improving the effect of the first diaphragm c separating the second pole piece b and the first pole piece a. The risk of defect leakage during the production process of the electrode assembly 200 is reduced, and the second pole piece b and the first pole piece a in the produced electrode assembly 200 are not easy to overlap and short-circuit, and the second pole piece b is not easy to overlap with the shell 3011 of the battery cell 301 to cause corrosion and leakage.

[0243] Combination Figure 4 and Figure 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, the first cache mechanism 81 is arranged between the second polymerization mechanism 32 and the first polymerization mechanism 31, and the first cache mechanism 81 is used to cache the second composite sheet f.

[0244] It is worth explaining 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 sequence of the workstations, 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.

[0245] 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.

[0246] Combination Figure 4 A first buffer mechanism 81 is provided between the second polymerization mechanism 32 and the first polymerization mechanism 31. The first buffer mechanism 81 can cache part of the second composite sheet f after the first pole piece a and the first diaphragm c are polymerized. The first buffer mechanism 81 can cache part of the second composite sheet f when the winding needle 42 is switched 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, pole piece 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 continuously feed and improve production efficiency.

[0247] Combination Figure 4 , the first buffer mechanism 81 is arranged between the second polymerization mechanism 32 and the first polymerization mechanism 31, and the first buffer mechanism 81 is used for winding the second composite sheet f formed by the first electrode a and the first diaphragm c. The first buffer mechanism 81 refers to a structure for temporarily storing electrode sheets and diaphragms in the winding device 100, and the first buffer mechanism 81 can also release the electrode sheets and diaphragms cached therein; the first buffer mechanism 81 is arranged between the second polymerization mechanism 32 and the first polymerization mechanism 31 for winding the second composite sheet f; for example, when the first composite sheet e is wound on the winding needle 42, the turret 41 drives the winding needle 42 to move so that the idle winding needle 42 moves to the side of the first polymerization mechanism 31. In this process, the second composite sheet f lacks the pulling force provided by the winding needle 42, which easily leads to insufficient tension and feed amount. At this time, the first buffer mechanism 81 can cache part of the second composite sheet f to supplement the tension of the second composite sheet f and reduce the wrinkles of the second composite sheet f.

[0248] The first buffer mechanism 81 can store the second composite sheet f composited by the second polymerization mechanism 32 by winding, stacking, etc.

[0249] Combination Figure 4, exemplarily, the first cache mechanism 81 may include one or more rollers, and the second composite sheet f can bypass one or more rollers of the first cache mechanism 81 and then enter the first polymerization mechanism 31. The first cache 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 cache 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 playing the role 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 starts to wind the first composite sheet e, the first cache 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 cache 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.

[0250] Combination Figure 4 Exemplarily, the first cache mechanism 81 may include a first fixed roller 811 and a first floating roller 812, 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.

[0251] Combination Figure 4 The first fixed roller 811 refers to a 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.

[0252] Combination Figure 4The first floating roller 812 refers to a 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.

[0253] Combination Figure 4 The first floating roller 812 can move in a direction close to the first fixed roller 811, and can move in a direction away from the first fixed roller 811. When the first floating roller 812 moves in a direction away from the first fixed roller 811, the first buffer mechanism 81 stores the second composite sheet f, and at this time, the length of the second composite sheet f between the second polymerization mechanism 32 and the first polymerization mechanism 31 increases, and the movement of the first floating roller 812 can also supplement the missing part of the tension on the second composite sheet f; when the first floating roller 812 moves in a direction close to the first fixed roller 811, the first buffer mechanism 81 releases the second composite sheet f.

[0254] Combination Figure 4 , the floating of the first floating roller 812 can be passive floating or active floating. In some embodiments, the floating of the first floating roller 812 is achieved by elastic members such as springs and rubber strips. At this time, 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 large and causes the first floating roller 812 to move toward the first fixed roller 811, and the elastic member is in a deformed state; while in the process of the turret 41 driving the winding needle 42 to move, the tension on the second composite sheet f decreases, the elastic member returns to its original state and drives the first floating roller 812 to move 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 relatively 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.

[0255] Combination Figure 4The number of the first fixed rollers 811 may be one, or two or more; the number of the floating rollers 812 may be one, or two or more; when the number of the first fixed rollers 811 and the 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.

[0256] Combination Figure 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.

[0257] Combination Figure 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 being compounded, 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.

[0258] Combination Figure 4 and Figure 5 In some embodiments, when the winding device 100 includes a first cache mechanism 81 , a first cutting mechanism 61 for cutting off the first pole piece a may be disposed between the first feeding mechanism 11 and the second polymerization mechanism 32 .

[0259] It is worth explaining 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 sequence of workstations, that is, the first electrode piece a output by the first feeding mechanism 11 can be cut off by the first cutting mechanism 61 before entering the second aggregation mechanism 32.

[0260] For example, in combination Figure 5 The first cutting mechanism 61 can cut the first electrode piece a and then feed it to the second polymerization mechanism 32 in sections, or feed the already segmented first electrode piece a to the second polymerization mechanism 32 in sections by inserting the first electrode piece. For example, the first cutting mechanism 61 can include components such as a feeding roller and a cutting knife.

[0261] During the production process, the first buffer mechanism 81 buffers the material and can continuously transfer the material downstream, so that the winding needle 42 can operate without deceleration and is not affected by the operation of the first cutting mechanism 61 upstream of the first buffer mechanism 81. Figure 5 As shown, the first cutting mechanism 61 has a high precision requirement for cutting the first electrode piece a, resulting in a slow operation speed. The first buffer mechanism 81 is used to buffer the second composite piece f after the first electrode piece a and the first diaphragm c are polymerized, and the winding needle 42 operates at a faster speed. Through the buffering of the first buffer mechanism 81, the first buffer mechanism 81 can still deliver the second composite piece f to the first polymerization mechanism 31 during the process of the first cutting mechanism 61 cutting the first electrode piece a, without reducing the speed of the winding needle 42, thereby improving the winding efficiency and thus improving the overall production capacity. Moreover, the first cutting mechanism 61 can be set away from the winding mechanism 40 in space, so as to solve the adverse effect of the cutting chips formed by cutting and falling into the electrode assembly 200 wound on the winding needle 42 on the quality of the electrode assembly 200, thereby facilitating further improving the quality of the electrode assembly 200.

[0262] When the winding device 100 includes the first buffer mechanism 81, the second detection device 72 can be arranged upstream of the first buffer mechanism 81 (for example, Figure 4 The second detection device 72 may also be disposed downstream of the first buffer mechanism 81 (eg Figure 5 ). Figure 5 As shown, when the second detection device 72 is arranged downstream of the first cache mechanism 81, the second detection device 72 can detect the second composite sheet f released by the first cache mechanism 81. Thus, defects of the second composite sheet f generated during the polymerization process and the cache process can be detected by the second detection device 72, which is beneficial to improving the quality of the electrode assembly 200 used for production.

[0263] For example, in combination 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, and the first cutting mechanism 61 and the second cutting mechanism 62 can cut the first electrode sheet a and the second electrode sheet b before the first polymerization mechanism 31, and the third cutting mechanism 63 cuts 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.

[0264] Moreover, when the first buffer mechanism 81 is provided, during the production process, the materials are buffered by the first buffer mechanism 81 and can be continuously transmitted downstream, so that the third cutting mechanism 63 can perform the cutting operation without deceleration, and is not affected by the operation of the first cutting mechanism 61 upstream of the first buffer mechanism 81. Figure 5 As shown, the first cutting mechanism 61 has a high precision requirement for cutting the first electrode piece a, resulting in a slow operating speed. The first buffer mechanism 81 is used to buffer the second composite piece f polymerized by the first electrode piece a and the first diaphragm c. The third cutting mechanism 63 is used to cut the first diaphragm c and the second diaphragm d. The precision requirement is low and the operating speed is fast. By caching with the first buffer mechanism 81, during the process of the first cutting mechanism 61 cutting the first electrode piece a, the first buffer mechanism 81 can still convey the second composite piece f to the first polymerization mechanism 31 without reducing the speed of the first polymerization mechanism 31. The third cutting mechanism 63 can cut the strip electrode assembly 200 without deceleration, thereby improving the winding efficiency and thereby improving the overall production capacity.

[0265] 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.

[0266] Combination Figure 4 Exemplarily, the first cutting mechanism 61 is arranged between the first feeding mechanism 11 and the second polymerization mechanism 32, and includes a first cutter 611 and a first push piece 612. The first cutter 611 and the first push piece 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 piece 612.

[0267] Combination Figure 4 The first cutter 611 and the first push member 612 are both part of the pole piece cutting assembly 61. The first cutter 611 and the first push member 612 are arranged between the first feeding mechanism 11 and the second polymerization mechanism 32 to cut the first pole piece a.

[0268] Combination Figure 4 The first cutter 611 refers to a structure in the winding device 100 for cutting the pole 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 a motor in conjunction with a cam and a rocker arm, and the first cutter 611 can also be driven by a cylinder, a hydraulic cylinder and other devices to realize a reciprocating cutting action; in some embodiments, the first pole piece a is a cathode pole piece, because the material of the cathode pole piece usually includes lithium iron phosphate, lithium cobalt oxide or silicon-based materials, vanadate materials, etc., and 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.

[0269] Combination Figure 4 The first push 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 push member 612. When the first cutter 611 cuts the first pole piece a, the first pole piece a can be pressed against the first push member 612 and cut off. The material of the first push member 612 may include plastic, metal or other materials.

[0270] Combination Figure 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.

[0271] Combination Figure 4 The first cutter 611 and the first push piece 612 are arranged relatively spaced apart, and the first pole piece a can pass through the space between the first cutter 611 and the first push piece 612; when the first cutter 611 is raised, the distance between the first cutter 611 and the first push piece 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.

[0272] Combination Figure 4 The first pole 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 pole piece a to move to the first aggregation mechanism 31 through the first buffer mechanism 81 .

[0273] Combination Figure 4 The first cutter 611 and the first abutting member 612 are arranged between the first feeding mechanism 11 and the second aggregation mechanism 32. The first abutting member 612 supports the first pole piece a and provides support for the first cutter 611 to cut the first pole piece a. The pole piece is cut by the first cutter 611 to achieve cutting of the first pole piece a.

[0274] Combination Figure 4 and Figure 5 In some embodiments, when the winding device 100 includes the second polymerization mechanism 32, the second pole piece b and the second diaphragm d can be separately fed into the first polymerization mechanism 31, that is, the second pole piece b and the second diaphragm d are not pre-polymerized before entering the first polymerization mechanism 31. Thus, the structure can be simplified.

[0275] For example, in combination Figure 4 and Figure 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 can be arranged between the second feeding mechanism 12 and the first polymerization mechanism 31 .

[0276] It is worth explaining that “the second cutting mechanism 62 is arranged between the second feeding mechanism 12 and the first polymerization 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 polymerization mechanism 31 are not limited), but a restriction on the sequence of the workstations, 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 polymerization mechanism 31.

[0277] Therefore, 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 the chips formed by cutting falling into the electrode assembly 200 wound on the winding needle 42, thereby facilitating further improving the quality of the electrode assembly 200.

[0278] Combination Figure 4 In some embodiments, the second cutting mechanism 62 includes a cam cutter. Therefore, 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 in response to the cutting, so the second cutting mechanism 62 can cut the second pole piece b without deceleration, which can improve the production capacity, and because the space requirement for chasing cutting is omitted, it is helpful to reduce space occupation.

[0279] Combination Figure 4 Exemplarily, the second cutting mechanism 62 includes a first cam cutter 621 and a second push piece 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 piece 622.

[0280] Combination Figure 4 The first cam cutter 621 and the second abutting member 622 are both parts 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.

[0281] Combination Figure 4 The first cam cutter 621 can intermittently act and cut off the second pole piece b, and 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.

[0282] Combination Figure 4The 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, and the intermittent time of the cutter = the required length of the second pole piece b / the linear speed 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, and the intermittent time of the cutter = the required length of the second pole piece b / the linear speed 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, not limited to the above two.

[0283] Combination 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 may include plastic, metal or other materials.

[0284] Combination Figure 4 The second push piece 622 can be a rectangular thin plate structure, a cylindrical structure or other structures; the second push piece 622 can be a fixed structure or a rotatable structure to reduce the friction between the second pole piece b and the second push piece 622; in some embodiments, the second push piece 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.

[0285] Combination Figure 4 The first cam cutter 621 and the second push piece 622 are arranged relatively spaced apart, and the second pole piece b can pass through the gap between the first cam cutter 621 and the second push piece 622; when the first cam cutter 621 is raised, the distance between the first cam cutter 621 and the second push piece 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.

[0286] Combination Figure 4This embodiment provides some specific structures of the pole piece cutting assembly 61, and the first cam cutter 621 and the second abutting member 622 are arranged between the second feeding mechanism 12 and the first polymerization mechanism 31. The second abutting 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 accuracy of the cam cutter structure is high and no other structure is required to control its intermittent position, which is convenient for control and can also simplify the structure of the cutter.

[0287] Combination Figure 4 For example, the third cutting mechanism 63 may include a second cam cutter 631 and a third push piece 632 that are relatively spaced apart. The second cam cutter 631 can rotate and cut the diaphragm on the third push piece 632. The second cam cutter 631 refers to a mechanism in the third cutting mechanism 63 for cutting the diaphragm; the second cam cutter 631 can intermittently act and cut 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 higher efficiency, higher precision, more precise intermittent indexing action, and more stable rotation, and can more accurately achieve periodic interval cutting of the diaphragm.

[0288] Combination Figure 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 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, 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, not limited to the above two.

[0289] Combination Figure 4 The third push piece 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 piece 632. When the second cam cutter 631 cuts the diaphragm, the diaphragm can be pressed against the third push piece 632 and cut off. The material of the third push piece 632 may include plastic, metal or other materials.

[0290] Combination Figure 4The third push piece 632 can be a rectangular thin plate structure, a cylindrical structure or other structures; the third push piece 632 can be a fixed structure or a rotatable structure to reduce the friction between the diaphragm and the third push piece 632; in some embodiments, the third push piece 632 is a roller structure rotatably connected to the housing, and the second cam cutter 631 can press the diaphragm against the roller mechanism and cut the diaphragm when cutting the diaphragm.

[0291] Combination Figure 4 The present 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 support member 632. The second cam cutter 631 can perform the cutting action periodically and intermittently. The length of the diaphragm can be controlled by controlling the intermittent duration of the second cam cutter 631. The intermittent indexing action of the cam cutter 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.

[0292] 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.

[0293] The rotation cycle length of the second cam cutter 631 is the time taken by 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, and 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.

[0294] The first diaphragm c and the second diaphragm d are simultaneously conveyed toward the winding mechanism 40 and have the same transmission line speed. The lengths of the first diaphragm c and the second diaphragm d in the electrode assembly 200 may be equal or unequal. 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 duration 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.

[0295] 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 waiting time for cutting is saved; the second cam cutter 631 can cut the membrane to be cut every time it rotates one circle. There is no need to reduce the transmission line speed of the membrane in order to cut the membrane, thus achieving the cutting of the membrane without deceleration, and effectively improving the overall winding speed.

[0296] 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 be smaller than the ratio of the length of the film to be cut to the transmission line speed of the film to be cut.

[0297] In the embodiment of the present application, the second electrode piece b and the second diaphragm d may not be fed into the first polymerization mechanism 31 separately. Fig.10 In some embodiments of the present application, the winding device 100 also 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 polymerize the second pole piece b and the second diaphragm d into a third composite sheet g.

[0298] 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 be transported to the third polymerization mechanism 33 and polymerized by the third polymerization mechanism 33. Among them, 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, and the second electrode piece b and the second diaphragm d in the third composite sheet g can only be in contact without being connected, or can be both 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 unconnected bonding state.

[0299] Therefore, by setting the third polymerization mechanism 33 upstream of the first polymerization mechanism 31, the second pole piece 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 pole piece b and the second diaphragm d, as well as the respective states of the second pole piece b and the second diaphragm d can be better guaranteed, thereby improving product quality.

[0300] Combination Fig.10, wherein the type of the third polymerization mechanism 33 is not limited, and can be specifically set according to whether the second pole piece 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 as 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 pole piece b and the second diaphragm d in the third composite sheet g. Thereby reducing the displacement of the second pole piece 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 the 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.

[0301] 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 being a composite mechanism. For example, the third polymerization mechanism 33 can also be a mechanism for stacking the second pole piece b and the second diaphragm d in the third composite sheet g together without connecting them.

[0302] Combination Fig.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.

[0303] 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 be inspected by the third detection device 73 before entering the first polymerization mechanism 31.

[0304] Combination Fig.10 The third detection device 73 is disposed between the third polymerization mechanism 33 and the first polymerization mechanism 31, and is used to detect 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 may obtain image information (such as position, color, shape, etc.) of the relative third composite sheet g, and may convert the image information into a digital signal and send it to the control device, so that the control device may determine whether the third composite sheet g meets the requirements according to a preset program.

[0305] Combination Fig.10By 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 the third polymerization mechanism 33 and not entering the first polymerization mechanism 31, so as to timely discover the defects and abnormalities of the third composite sheet g, so as to facilitate timely response when problems occur in the third composite sheet g, thereby reducing the negative impact on subsequent processes and improving product quality.

[0306] Combination Fig.10 The third detection device 73 is used to detect the relative position of the second pole piece b and the second diaphragm d in the third composite sheet g. Thus, the third detection device 73 can detect the OH of the second diaphragm d exceeding the second pole piece b. "The OH of the second diaphragm d exceeding the second pole piece b" means that the edge of the second diaphragm d exceeds the edge of the active material area of ​​the second pole piece b in the width direction of the pole piece. The defective OH means that the size of the exceeding part does not meet the required size range.

[0307] Combination Fig.10 When the third polymerization mechanism 33 is a composite mechanism, the third detection device 73 is disposed downstream of the third polymerization mechanism 33 and is capable of detecting the composite state of the third composite sheet g, for example, detecting composite defects such as corner bending and breakage of the second electrode sheet b.

[0308] 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 information such as defects of the second composite sheet f. The third detection device 73 can detect multiple locations in the length direction of the material in sequence during the material movement, or can continuously detect the material in the length direction.

[0309] For example, the third detection device 73 may be a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different detection devices may be the same or different. For example, the third detection device 73 may include a linear array camera or an area array camera, wherein the image acquisition range of the linear array camera is narrow but the acquisition accuracy is high, so that the linear array cameras can be respectively arranged on both sides of the material width direction F2 to improve the detection accuracy; the image acquisition range of the area array camera is large but the acquisition accuracy is low, so that the area array camera can be arranged in the middle of the material width direction F2 to reduce the cost.

[0310] 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 the composite state are detected by the first detection device 71 and the third detection device 73 respectively, so as to achieve more comprehensive detection, wherein the third detection device 73 can detect whether the relative position of the second pole piece b and the second diaphragm d before the edge sealing of the first diaphragm c and the second diaphragm d is accurate, and improve the position accuracy of the second pole piece b and the second diaphragm d, and the two sides of the width direction F2 of the second diaphragm d can exceed the edge of the second pole piece b by a sufficient size, so as to provide sufficient space for edge sealing, and improve the effect of the first diaphragm c separating the second pole piece b and the first pole piece a. The risk of defect leakage during the production process of the electrode assembly 200 is reduced, and the second pole piece b and the first pole piece a in the produced electrode assembly 200 are not easy to overlap and short-circuit, and the second pole piece b is not easy to overlap with the shell 3011 of the battery cell 301 to cause corrosion and leakage.

[0311] Combination Fig.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.

[0312] It is worth explaining that “the second cache mechanism 82 is arranged 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 second cache mechanism 82, the first polymerization mechanism 31 and the third polymerization mechanism 33 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 cached by the second cache mechanism 82 before entering the first polymerization mechanism 31.

[0313] 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.

[0314] Combination Fig.10A second buffer mechanism 82 is provided between the third polymerization mechanism 33 and the first polymerization mechanism 31. The second buffer mechanism 82 can cache part of the third composite sheet g after the second pole piece b and the second diaphragm d are polymerized. The second buffer 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, pole piece 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 continuously feed and improve production efficiency.

[0315] Combination Fig.10 , the second buffer mechanism 82 is arranged between the third polymerization mechanism 33 and the first polymerization mechanism 31, and the second buffer mechanism 82 is used for winding the third composite sheet g formed by the second electrode b and the second diaphragm d. The second buffer mechanism 82 refers to a structure for temporarily storing electrode sheets and diaphragms in the winding device 100, and the second buffer mechanism 82 can also release the electrode sheets and diaphragms cached therein; the second buffer mechanism 82 is arranged between the third polymerization mechanism 33 and the first polymerization mechanism 31 for winding the third composite sheet g; for example, when the first composite sheet e is wound on the winding needle 42, the turret 41 drives the winding needle 42 to move so that the idle winding needle 42 moves to the side of the first polymerization mechanism 31. In this process, the third composite sheet g lacks the pulling force provided by the winding needle 42, which easily leads to insufficient tension and feed amount. At this time, the second buffer mechanism 82 can cache part of the third composite sheet g to supplement the tension of the third composite sheet g and reduce the wrinkles of the third composite sheet g.

[0316] 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.

[0317] Combination Fig.10 In some embodiments, when the winding device 100 includes a second buffer mechanism 82 , a second cutting mechanism 62 for cutting off the second pole piece b may be disposed between the second feeding mechanism 12 and the third polymerization mechanism 33 .

[0318] It is worth explaining that “the second cutting mechanism 62 is arranged between the second feeding mechanism 12 and the third polymerization 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 polymerization mechanism 33 are not limited), but a restriction on the sequence of the workstations, 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 polymerization mechanism 33.

[0319] For example, in combination Fig.10 The second cutting mechanism 62 can cut the second electrode piece b and then feed it to the third polymerization mechanism 33 in sections, or feed the already segmented second electrode piece b to the third polymerization mechanism 33 in sections by inserting the pieces. For example, the second cutting mechanism 62 can include components such as a feeding roller and a cutting knife.

[0320] During the production process, the second buffer mechanism 82 buffers the material and can continuously transfer the material downstream, so that the winding needle 42 can operate without deceleration and is not affected by the operation of the second cutting mechanism 62 upstream of the second buffer mechanism 82. Fig.10 As shown, the second cutting mechanism 62 has a high precision requirement for cutting the second electrode piece b, resulting in a slow operation speed. The second buffer mechanism 82 is used to buffer the third composite piece g after the second electrode piece b and the second diaphragm d are polymerized, and the winding needle 42 operates at a faster speed. Through the second buffer mechanism 82 buffering, the second buffer mechanism 82 can still deliver the third composite piece g to the third polymerization mechanism 33 during the process of the second cutting mechanism 62 cutting the second electrode piece b, without reducing the speed of the winding needle 42, thereby improving the winding efficiency and thus improving the overall production capacity. Moreover, the second cutting mechanism 62 can be set away from the winding mechanism 40 in space, so as to solve the adverse effect of the cutting chips formed by cutting falling into the electrode assembly 200 wound on the winding needle 42 on the quality of the electrode assembly 200, thereby further improving the quality of the electrode assembly 200.

[0321] When the winding device 100 includes the second buffer mechanism 82, the third detection device 73 can be arranged upstream of the second buffer mechanism 82 (for example, Fig.10 In the embodiment shown in the figure), the third detection device 73 can also be arranged downstream of the second buffer mechanism 82. When the third detection device 73 is arranged downstream of the second buffer mechanism 82, the third detection device 73 can detect the third composite sheet g released by the second buffer mechanism 82, thereby, the defects of 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 conducive to improving the quality of the electrode assembly 200 used for production.

[0322] When the fourth feeding mechanism 22 is disposed 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 (for example, refer to Figure 11-Figure 15 ); or, the first electrode a, the first diaphragm c and the second electrode b may be firstly polymerized (for example, referring to Fig.16 ).

[0323] Combination Figure 11-Figure 15In 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, and the fifth polymerization mechanism 35 is used to polymerize the first diaphragm c, the second electrode piece b and the second diaphragm d into a fifth composite piece j.

[0324] The second pole 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 pole piece b and the second diaphragm d is not limited. For example, the second pole piece b and the second diaphragm d in the fifth composite sheet j can be only in contact without being connected, or they can be both in contact and connected, so that the second pole piece b and the second diaphragm d in the fifth composite sheet j are in a connected or unconnected fitting state. The second pole piece b and the first diaphragm c in the fifth composite sheet j can be only in contact without being connected, or they can be both in contact and connected, so that the second pole piece b and the first diaphragm c in the fifth composite sheet j are in a connected or unconnected fitting state. The edge of the second diaphragm d and the edge of the first diaphragm c in the fifth composite sheet j can be only in contact without being connected, or they can be both in contact and connected with edge sealing.

[0325] Combination Fig.11 and Fig.12 , the second electrode piece b can be pulled from the second feeding mechanism 12 to the fifth polymerization mechanism 35, the second diaphragm d can be pulled from the fourth feeding mechanism 22 to the fifth polymerization mechanism 35, the first diaphragm 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 stack and composite the second diaphragm d, the second electrode piece b, and the first diaphragm c in sequence to form a fifth composite piece j, the first polymerization mechanism 31 is used to stack and composite the first electrode piece a and the fifth composite piece j to form a first composite piece e, and the first composite piece e is pulled from the first polymerization mechanism 31 to the winding mechanism 40, and is wound by the winding mechanism 40 to form the electrode assembly 20.

[0326] Thus, by providing the fifth polymerization mechanism 35 and the first polymerization mechanism 31, the second diaphragm d, the second pole piece b, the first diaphragm c and the first pole piece a are formed into the first composite sheet e through two steps in succession. In this way, the operation of forming the first composite sheet e by the second diaphragm d, the second pole piece b, the first diaphragm c and the first pole piece a can be more strictly controlled, which helps to improve the quality of the first composite sheet e, and further helps to improve the quality of the electrode assembly 200. By adopting the above technical solution, the fifth composite sheet j including the second pole piece b can be formed by the fifth polymerization mechanism 35 first, and then the first composite sheet e including the first pole piece a can be formed by the first polymerization mechanism 31. The second pole piece b and the first pole piece a are polymerized in succession, so that the polymerization quality of the second pole piece b and the first pole piece a can be separately controlled, which can help to improve the quality of the first composite sheet e, so as to improve the quality of the electrode assembly 200.

[0327] In addition, by providing the fifth polymerization mechanism 35 and the first polymerization mechanism 31, the second diaphragm d, the second pole piece b, the first diaphragm c and the first pole piece a are compounded to form the first compound piece e through two compounding steps. In addition, there can be a large space between the fifth polymerization mechanism 35 and the first polymerization mechanism 31, that is, the layout rationality of the winding device 100 can be improved, for example, it is conducive to the layout of the fifth detection device 75, the fourth cache mechanism 84, the fifth cache mechanism 85, etc. described later.

[0328] According to the connection relationship among the first diaphragm c, the second pole piece b and the second diaphragm d in the fifth composite sheet j, the form of the fifth polymerization mechanism 35 can be designed accordingly.

[0329] 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, and the first diaphragm c and the second diaphragm d will not separate when the external force is removed, causing the second pole piece b to be exposed. It is not easy to fold in the air during the winding process of the electrode assembly 200, and it is not easy to be disturbed by holes during the injection process, which effectively reduces 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, and improves the lithium deposition problem. 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.

[0330] Combination Fig.14When the fifth polymerization mechanism 35 is an edge sealing mechanism, the fifth composite sheet j is formed as a sheet body formed by the second pole piece b being edge 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 the occurrence of deviation, folding of the first diaphragm c, folding of the second diaphragm d, exposure of the second pole piece b and other problems, which is beneficial to improve the position accuracy of the second pole piece b in the transmission and subsequent processes, and reduce the risk of overlap between the second pole piece b and the first pole piece a.

[0331] Exemplarily, the fifth polymerization mechanism 35 is a composite mechanism, and is used to fix the second pole piece b in the fifth composite sheet j to the first diaphragm c and the second diaphragm d, respectively. This reduces the displacement of the first pole piece a relative to the first diaphragm c and the second diaphragm d during winding and use, which 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.

[0332] 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 methods. For example, the fifth polymerization mechanism 35 can include two rollers arranged relatively at intervals, or a roller and a support arranged relatively at intervals with the roller, or multiple rollers or other structures; the roller in the fifth polymerization mechanism 35 can be a rotatable structure, or a fixed structure, or a floating structure; the roller in the fifth polymerization mechanism 35 can also be an active roller or a passive roller.

[0333] In some embodiments, in combination Fig.12 and Fig.13 The fifth polymerization mechanism 35 includes a mechanism five composite roller 1 351 and a mechanism five composite roller 2 352. The rotation directions of the mechanism five composite roller 1 351 and the mechanism five composite roller 2 352 are opposite. The mechanism five composite roller 1 351 and the mechanism five composite roller 2 352 are used to cooperate in rolling to composite the second diaphragm d, the second pole piece b, and the first diaphragm c.

[0334] Combination Fig.12 and Fig.13The first composite roller 351 of the fifth mechanism and the second composite roller 352 of the fifth mechanism are both roller-shaped structures. The first composite roller 351 of the fifth mechanism and the second composite roller 352 of the fifth mechanism are arranged in parallel, specifically, the central axis of the first composite roller 351 of the fifth mechanism and the central axis of the second composite roller 352 of the fifth mechanism are arranged in parallel, and the rotation direction of the first composite roller 351 of the fifth mechanism is opposite to the rotation direction of the second composite roller 352 of the fifth mechanism. The first composite roller 351 of the fifth mechanism and the second composite roller 352 of the fifth mechanism are arranged at intervals to form a fifth composite gap 353.

[0335] Combination Fig.12 and Fig.13 The first composite roller 351 of mechanism five and the second composite roller 352 of mechanism five are distributed at intervals along the second direction F6 to form the fifth composite gap 353 mentioned above.

[0336] Based on the above structure, the second diaphragm d, the second pole piece b, and the first diaphragm c can pass through the fifth composite gap 353 and be rolled by the composite roller 1 351 of the mechanism 5 and the composite roller 2 352 of the mechanism 5, so as to composite to form the fifth composite piece j. In this way, the composite effect of the fifth polymerization mechanism 35 can be achieved.

[0337] 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.

[0338] In some embodiments, in combination Fig.12 and Fig.13 When the winding device 100 includes the fifth polymerization mechanism 35, the type of the first polymerization mechanism 31 is not limited. For example, the first polymerization mechanism 31 can be a composite mechanism, and is used to fix the fifth composite sheet j and the first pole sheet a. Alternatively, the first polymerization mechanism 31 can also be a mechanism for making the fifth composite sheet j and the first pole sheet a only stacked together without being connected.

[0339] Among them, when the first polymerization mechanism 31 is a composite mechanism and is used to fix the fifth composite sheet j and the first pole piece a, the displacement of the first pole piece a relative to the fifth composite sheet j during winding and use can be reduced, which is conducive to improving 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.

[0340] In some embodiments, in combination Fig.12 and Fig.13The first polymerization mechanism 31 includes a mechanism first composite roller 1 311 and a mechanism first composite roller 2 312. The rotation directions of the mechanism first composite roller 1 311 and the mechanism first composite roller 2 312 are opposite. The mechanism first composite roller 1 311 and the mechanism first composite roller 2 312 are used to cooperate in rolling to composite the first electrode sheet a and the fifth composite sheet j. The mechanism first composite roller 1 311 and the mechanism first composite roller 2 312 are both roller-shaped structures.

[0341] 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 arranged at intervals to form a first composite gap 313.

[0342] The first composite roller 311 of the mechanism 1 and the second composite roller 312 of the mechanism 1 are distributed at intervals along the second direction F6 to form the above-mentioned first composite gap 313 at intervals.

[0343] Based on the above structure, the first electrode sheet a and the fifth composite sheet 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 sheet e. In this way, the composite effect of the first polymerization mechanism 31 can be achieved.

[0344] 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.

[0345] Combination Fig.11 and Fig.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 is located between the fifth polymerization mechanism 35 and the first polymerization mechanism 31, and is used to detect the fifth composite sheet j.

[0346] 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 workstations, that is, the fifth composite sheet j formed by the polymerization of the fifth polymerization mechanism 35 can be inspected by the fifth detection device 75 before entering the first polymerization mechanism 31.

[0347] The fifth detection device 75 can be, but is not limited to, a CCD (charge coupled device) camera. Exemplarily, the fifth detection device 75 can include a camera, a machine vision detection device, or other structures. Exemplarily, the fifth detection device 75 can also include other devices such as a control device. The fifth detection device 75 can obtain image information (such as position, color, shape, etc.) of the relative fifth composite sheet j, and can convert the image information into a digital signal and send it to the control device, so that the control device can determine whether the fifth composite sheet j meets the requirements according to a preset program.

[0348] Combination Fig.11 and Fig.12 By setting 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, so that the quality of the fifth composite sheet j can be obtained.

[0349] 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.

[0350] For example, combined with Fig.11 and Fig.12 , the fifth detection device 75 can be used to detect the relative position of the first diaphragm c and the second pole 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 pole piece b. "The OH of the first diaphragm c exceeding the second pole piece b" means that the edge of the first diaphragm c exceeds the size of the active material area edge of the second pole piece b in the width direction of the pole piece. The defect of OH means that the size of the exceeding part does not meet the required size range. Thus, the first diaphragm c can play a more reliable insulation role between the second pole piece b and the first pole piece a.

[0351] 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 information such as defects of the fifth composite sheet j. The fifth detection device 75 can detect multiple locations in the length direction of the material in sequence during the material movement, or can continuously detect the material in the length direction.

[0352] For example, in combination Fig.11 and Fig.12 When the fifth polymerization mechanism 35 is a composite mechanism, the fifth detection device 75 is disposed downstream of the fifth polymerization mechanism 35 and is capable of detecting the composite state of the fifth composite sheet j, for example, detecting composite defects such as corner folding and breakage of the second electrode sheet b.

[0353] For example, in combination Fig.11 and Fig.12 When the fifth polymerization mechanism 35 is an edge sealing mechanism, the fifth detection device 75 can be used to detect the edge sealing state of the fifth composite sheet j. The fifth composite sheet j can be transferred to the fifth detection device 75 after edge sealing, so that the fifth detection device 75 can be used to detect the state of the formed edge sealing. For example, the edge sealing defects such as the folding angle of the second pole piece b, the wrinkling of the first diaphragm c and the second diaphragm d, the edge sealing failure, the edge sealing dislocation, the edge sealing size, and the 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 as to adjust the first diaphragm c, the second diaphragm d and the edge sealing mechanism according to the detection results, so that the width of the formed edge sealing is 0.5mm~1mm, and the edge sealing is generally in the middle of the first diaphragm c and the second diaphragm d beyond the edge of the second pole piece b, thereby improving the reliability of the edge sealing, and the first diaphragm c and the second diaphragm d can play a reliable limiting and protective role for the second pole piece b.

[0354] When the fifth polymerization 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 pole 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 pole piece b, and "the OH of the first diaphragm c and the second diaphragm d exceeding the second pole piece b" means the size of the edge of the first diaphragm c exceeding the edge of the active material area of ​​the second pole piece b, and the size of the edge of the second diaphragm d exceeding the edge of the active material area of ​​the second pole piece b in the width direction of the pole piece.

[0355] 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.

[0356] Exemplarily, when the fifth polymerization mechanism 35 is an edge sealing mechanism and the first polymerization mechanism 31 is a composite mechanism, the edge sealing mechanism is arranged upstream of the composite mechanism. The edge sealing mechanism is used to seal the second electrode sheet b and the first diaphragm c and the second diaphragm d to form a fifth composite sheet j. After the fifth composite sheet j is transferred to the composite mechanism, the composite mechanism can attach the first electrode sheet a to one side of the fifth composite sheet j and composite them to form an unwound electrode assembly 200.

[0357] At this time, the first detection device 71 is also used to detect the relative position of the second pole piece b and the first pole piece a. After the fifth composite sheet j and the first pole piece a are stacked and composited, the relative position of the second pole piece b and the first pole piece a of the obtained electrode assembly 200 is accurate, for example, the requirement that the width of the second pole piece b exceeds the edge of the first pole piece a by a certain distance on both sides is met, the risk of OH leakage is reduced, and the effect of solving the lithium precipitation problem is better.

[0358] For example, the fifth detection device 75 may adopt a photoelectric sensor, an X-ray camera, a CCD (charge coupled device) visual sensor, etc., and the types of different detection devices may be the same or different. For example, the fifth detection device 75 may include a CCD. CCD can obtain an optical image of the material to achieve detection. Furthermore, 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.

[0359] In some embodiments, in combination Fig.11 and Fig.12 When the winding device 100 includes the fifth polymerization mechanism 35, the winding device 100 may further include: a fourth cache mechanism 84, which is disposed between the fifth polymerization mechanism 35 and the first polymerization mechanism 31 and is used to cache the fifth composite sheet j.

[0360] In some embodiments, in combination Fig.12 The fourth cache mechanism 84 is disposed between the fifth polymerization mechanism 35 and the first polymerization mechanism 31 and is used to cache the fifth composite sheet j. The fourth cache mechanism 84 is disposed between the fifth polymerization mechanism 35 and the first polymerization mechanism 31 and is used to cache the fifth composite sheet j, so that the fourth cache mechanism 84 can cache the fifth composite sheet j located between the fifth polymerization mechanism 35 and the first polymerization mechanism 31.

[0361] 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.

[0362] In some embodiments, in combination 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 can be arranged between the second feeding mechanism 12 and the fifth polymerization mechanism 35 .

[0363] It is worth explaining 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 sequence of the workstations, 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.

[0364] In this way, when the second cutting mechanism 62 needs to slow down and cut off the second electrode sheet b, the fourth buffer mechanism 84 can release the buffered fifth composite sheet j to supply the first polymerization mechanism 31, so that 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, and further the winding mechanism 40 can 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 to improve the production efficiency of the electrode assembly.

[0365] Moreover, the second cutting mechanism 62 can be arranged spatially away from the winding mechanism 40 to solve the problem of the adverse effect of the cutting chips falling into the electrode assembly 200 wound on the winding needle 42 on the quality of the electrode assembly 200, thereby facilitating further improving the quality of the electrode assembly 200.

[0366] For example, the tape running 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 off the second electrode sheet b, so that the cutting operation of the second electrode sheet b can be guaranteed to a certain extent. In addition, when the tape running of the second electrode sheet b stops and the cutting operation is performed, since 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, and then the winding mechanism 40 can 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 to improve the production efficiency of the electrode assembly.

[0367] In some embodiments, in combination Fig.12 The fourth buffer mechanism 84 may include a fourth floating roller 842 and a plurality of fourth fixed rollers 841. The fourth floating roller 842 and the fourth fixed roller 841 are used to alternately bypass the fifth composite sheet j, and the fourth floating roller 842 can move relative to the fourth fixed roller 841 to buffer the fifth composite sheet j. The fourth fixed roller 841 refers to a pulley that can rotate and has a fixed position. The fourth floating roller 842 refers to a pulley that can rotate and has a non-fixed position. The number of the fourth floating roller 842 may be at least one.

[0368] The fourth floating roller 842 and the fourth fixed roller 841 are used to alternately bypass the fifth composite sheet j, which means that the fifth composite sheet j can alternately bypass the fourth floating roller 842 and the fourth fixed roller 841. Taking the example that the number of the fourth fixed rollers 841 is two and the number of the fourth floating roller 842 is one, the fifth composite sheet j can sequentially bypass one of the fourth fixed rollers 841, the fourth floating roller 842 and the other fourth fixed roller 841. Taking the example that the number of the fourth fixed rollers 841 is three and the number of the fourth floating rollers 842 is two, as Figure 2 and Figure 3 As shown, the fifth composite sheet j may 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 .

[0369] A plurality of fourth fixed rollers 841 are distributed at intervals along the first direction F5. In the first direction F5, a fourth floating roller 842 is provided between two adjacent fourth fixed rollers 841. Moreover, the fourth fixed roller 841 and the fourth floating roller 842 are also distributed at intervals along the second direction F6. The fifth composite sheet j alternately bypasses the fourth fixed roller 841 and the fourth floating roller 842 and is pulled to the first polymerization mechanism 31. When the second pole piece b stops running for cutting operation, 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, so that the first polymerization mechanism 31 can continuously and uninterruptedly composite the fifth composite sheet j to form the first composite sheet e, and accordingly, the winding mechanism 40 can continuously and uninterruptedly perform winding operation on the first composite sheet e.

[0370] 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.

[0371] It should be noted that the length of the fifth composite sheet j that can be cached by the fourth cache mechanism 84 can be adjusted by adjusting the fourth floating roller 842 and the number of the fourth floating rollers 842 and adjusting the distance between the fourth floating roller 842 and the fourth fixed roller 841 .

[0372] When the winding device 100 includes the fourth buffer mechanism 84, the fifth detection device 75 can be disposed between the fifth polymerization mechanism 35 and the fourth buffer mechanism 84; or, the fifth detection device 75 can also be disposed between the fourth buffer mechanism 84 and the first polymerization mechanism 31. When the fifth detection device 75 is disposed between the fourth buffer mechanism 84 and the first polymerization mechanism 31, defects of the fifth composite sheet j generated during the polymerization process and the buffering process can be detected by the fifth detection device 75, which is beneficial to improving the quality of the electrode assembly 200 used for production.

[0373] Combination Fig.11 and Fig.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, the fifth cache mechanism 85 is arranged between the first polymerization mechanism 31 and the winding mechanism 40, and is used to cache the first composite sheet e.

[0374] 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.

[0375] Combination Fig.11 and Fig.12 In some embodiments, when the winding device 100 includes a fifth buffer mechanism 85 , the first cutting mechanism 61 for cutting off the first pole piece a may be disposed between the first feeding mechanism 11 and the first polymerization mechanism 31 .

[0376] It is worth explaining 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 sequence of workstations, that is, the first electrode piece a output by the first feeding mechanism 11 can be cut off by the first cutting mechanism 61 before entering the first aggregation mechanism 31.

[0377] In this way, when the first cutting mechanism 61 needs to slow down and 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, so that the winding mechanism 40 can 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 to improve the production efficiency of the electrode assembly. Moreover, the first cutting mechanism 61 can be set away from the winding mechanism 40 in space to solve the adverse effect of the cutting chips and the like falling into the electrode assembly 200 wound on the winding needle 42 on the quality of the electrode assembly 200, thereby facilitating further improvement of the quality of the electrode assembly 200.

[0378] For example, the tape running 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 operation of the first electrode sheet a and the second electrode sheet b, and cut off the first electrode sheet a and the second electrode sheet b, so that the cutting operation of the second electrode sheet b and the first electrode sheet a can be guaranteed to a certain extent. In addition, the tape running of the second electrode sheet b and the first electrode sheet a is stopped, and during the cutting operation, since 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 device 100, so as to improve the production efficiency of the electrode assembly.

[0379] In some embodiments, in combination Fig.12 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 used to alternately bypass the first composite sheet e, and the fifth floating roller 852 can move relative to the fifth fixed roller 851 to buffer the first composite sheet e.

[0380] The fifth fixed roller 851 refers to a pulley that can rotate and is fixed in position. The fifth floating roller 852 refers to a pulley that can rotate and is not fixed in position. There can be at least one fifth floating roller 852.

[0381] The fifth floating roller 852 and the fifth fixed roller 851 are used to alternately bypass the first composite sheet e, which means that the first composite sheet e can alternately bypass the fifth floating roller 852 and the fifth fixed roller 851. Taking the example that the number of the fifth fixed rollers 851 is two and the number of the fifth floating roller 852 is one, the first composite sheet e can bypass one of the fifth fixed rollers 851, the fifth floating roller 852 and the other fifth fixed roller 851 in sequence.

[0382] Taking the example that the number of fifth fixed rollers 851 is three and the number of fifth floating rollers 852 is two, the first composite sheet e can sequentially pass around 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.

[0383] A plurality of fifth fixed rollers 851 are spaced apart along the first direction F5. In the first direction F5, a fifth floating roller 852 is provided between two adjacent fifth fixed rollers 851. Moreover, the fifth fixed roller 851 and the fifth floating roller 852 are spaced apart along the second direction F6. The first composite sheet e alternately bypasses the fifth fixed roller 851 and the fifth floating roller 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 operation, the fifth floating roller 852 can move toward the fifth fixed roller 851 along the second direction F6 to shorten the distance between the fifth fixed roller 851 and the fifth floating roller 852, so that the winding mechanism 40 can continuously and uninterruptedly perform the winding operation on the first composite sheet e. Among them, the first direction F5 and the second direction F6 are perpendicular.

[0384] 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 caching effect can be achieved for the first composite sheet e.

[0385] It should be noted that the length of the first composite sheet e that can be cached by the fifth cache mechanism 85 can be adjusted by adjusting the fifth floating roller 852 and the number of the fifth floating rollers 852 and adjusting the distance between the fifth floating roller 852 and the fifth fixed roller 851 .

[0386] When the winding device 100 includes the fifth buffer mechanism 85, the first detection device 71 may be disposed between the fifth buffer mechanism 85 and the first polymerization mechanism 31; or, the first detection device 71 may also 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 of 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 to improving the quality of the electrode assembly 200 used for production.

[0387] For example, in combination Fig.12 and Fig.13When the fourth feeding mechanism 22 is arranged upstream of the first polymerization mechanism 31, so that the second separator d is also polymerized in the first composite sheet e, and when the winding device 100 includes the fifth polymerization mechanism 35, the third cutting mechanism 63 can be arranged between the first polymerization mechanism 31 and the winding mechanism 40, and is used to cut the second separator d and the first separator c. In this way, it is relatively easy 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, and only one third cutting mechanism 63 is required, which can simplify the equipment, reduce costs, and save space. For example, in combination with Fig.12 and Fig.13 When the winding device 100 includes the fifth buffer mechanism 85 , the third cutting mechanism 63 is specifically arranged between the fifth buffer mechanism 85 and the winding mechanism 40 .

[0388] Combination Fig.16 In some embodiments, when the fourth feeding mechanism 22 is disposed upstream of the first polymerization mechanism 31, the winding device 100 may further include a fourth polymerization mechanism 34, which is located upstream of the first polymerization mechanism 31, and the fourth polymerization mechanism 34 is located downstream of the third feeding mechanism 21, the second feeding mechanism 12, and the first feeding mechanism 11, and the fourth polymerization mechanism 34 is used to polymerize the first electrode a, the first diaphragm c, and the second electrode b into the seventh composite sheet m. The seventh composite sheet m and the second diaphragm d are polymerized into the first composite sheet e through the first polymerization mechanism 31, and the first detection device 71 is disposed downstream of the first polymerization mechanism 31, and is used to detect the first composite sheet e.

[0389] At this time, the first detection device 71 can be used to detect the relative position of the second pole piece b and the first pole piece a. For example, the width of the second pole piece b is satisfied to exceed the edge of the first pole piece a by a certain distance on both sides, thereby reducing the risk of OH leakage and solving the lithium precipitation problem more effectively. Alternatively, the first detection device 71 can also be used to detect OH of the diaphragm-wrapped pole piece, etc.

[0390] When the winding device 100 includes the fourth polymerization mechanism 34, the first polymerization mechanism 31 may be an edge sealing mechanism, and is used to seal and connect at least one of the two edges of the first diaphragm c and the second diaphragm d in the width direction. At this time, the first detection device 71 may detect the edge sealing state. Alternatively, the first polymerization mechanism 31 may also be a composite mechanism, etc.

[0391] Of course, the present application is not limited thereto. In other embodiments of the present application, the first composite sheet e may not include the second diaphragm d. Fig.17 In some embodiments, the polymerization position of the second diaphragm d and the first composite sheet e is located downstream of the first detection device 71 .

[0392] The fourth feeding mechanism 22 is no longer arranged upstream of the first polymerization mechanism 31, so that the second diaphragm d released by the fourth feeding mechanism 22 cannot be delivered to the first polymerization mechanism 31. For example, the fourth feeding mechanism 22 can deliver 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 also deliver the second diaphragm d directly to the winding mechanism 40, etc.

[0393] 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 with the polymerized polymer sheet through the first polymerization mechanism 31 to form a first composite sheet e.

[0394] 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 detection device 71 can be used to detect the first composite sheet e. The detection items may include: detecting 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.

[0395] For example, combined with Fig.17 The first detection device 71 can be used to detect the state of the first electrode piece a in the first composite piece e. The state of the first electrode piece a includes but is not limited to the width of the active material layer of the first electrode piece a, known defective electrode pieces (such as defective pieces with yellow labels), and electrode piece damage.

[0396] For example, combined with Fig.17 The first detection device 71 can be used to detect the state of the first diaphragm c in the first composite sheet e. The state of the first diaphragm c includes but is not limited to diaphragm folding, damage, etc. The state of the second electrode sheet b and the first diaphragm c.

[0397] For example, combined with Fig.17 The first detection device 71 can be used to detect the state of the second electrode piece b in the first composite sheet e. The state of the second electrode piece b includes but is not limited to the width of the active material layer of the second electrode piece b, known defective electrode pieces (such as defective pieces with yellow labels), and electrode piece damage.

[0398] For example, combined with Fig.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, and the defect of OH means that the size of the exceeding part does not meet the required size range.

[0399] For example, combined with Fig.17 The first detection device 71 can be used to detect the relative position relationship between the second pole piece b and the first diaphragm c in the first composite sheet e, including but not limited to the OH of the first diaphragm c wrapping the second pole piece b, that is, the edge of the first diaphragm c exceeds the edge of the second pole 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.

[0400] Therefore, combined with Fig.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.

[0401] For example, the first detection device 71 may include a camera, a machine vision detection device or other structures, the camera is, for example, a CCD camera, and the first detection device 71 may also include other components such as a controller. The first detection device 71 may obtain image information (such as position, color, shape, etc.) of the relative pole piece, diaphragm, and first composite piece e, and may convert the image information into a digital signal and send it to the controller, so that the controller can determine whether the pole piece, diaphragm, and first composite piece e meet the requirements according to a preset program. For example, the first composite piece e can be transported straight, and the first detection device 71 can more comprehensively detect the state of the entire first composite piece e passing through, and the detection result can have a high degree of accuracy.

[0402] In the related art, the winding device winds the pole piece and the diaphragm at the winding needle, which makes it difficult for the head and tail of the pole piece and the diaphragm entering the winding needle to be detected by the detection device; in this embodiment, the winding device 100 includes a first detection device 71 arranged between the first polymerization mechanism 31 and the winding mechanism 40. The first detection device 71 is arranged upstream of the winding mechanism 40 to more comprehensively detect the first composite sheet e of the three-in-one stack of the first pole piece a, the first diaphragm c and the second pole piece b, thereby reducing the detection blind area and improving the detection accuracy. Moreover, since the first composite sheet e is a three-in-one stack of the first pole piece a, the first diaphragm c and the second pole piece b stacked in sequence, it is conducive to early and accurate detection.

[0403] For example, in combination Fig.17The winding device 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 diaphragm 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 diaphragm d. The winding mechanism 40 is used to wind the first composite sheet e and the second diaphragm d to form the electrode assembly 200. The first polymerization mechanism 31 firstly aggregates the first electrode sheet a, the first diaphragm c and the second electrode sheet b into the first composite sheet e, and then winds the first composite sheet e and the second diaphragm d on the winding mechanism 40. The first polymerization mechanism 31 and the winding mechanism 40 of the winding device 100 can be arranged at intervals, and each can obtain a larger space. In addition, the winding device 100 does not need to feed the cathode electrode sheet, the anode electrode sheet and the diaphragm to the winding mechanism 40 separately, which solves the problem of crowded space above the winding mechanism 40, optimizes the layout of the winding device 100, and is conducive to the flexible arrangement of various components. In addition, since the first polymerization mechanism 31 presses the first electrode sheet a, the first diaphragm c and the second electrode sheet b to form the first composite sheet e, the first composite sheet e can be fully inspected before entering the winding mechanism 40, thereby solving the problem of blind spots in the detection of the electrode assembly 200 after winding at the winding mechanism 40.

[0404] 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 body, it is not easy for the roller body to detach from the pole piece.

[0405] When the first composite sheet e does not include the second diaphragm d, the first electrode sheet a and the first diaphragm c in the first composite sheet e may only be in contact without being connected, or may be both in contact and connected, so that the first electrode sheet a and the first diaphragm c are in a connected or unconnected bonding state. At the same time, the second electrode sheet b and the first diaphragm c in the first composite sheet e may only be in contact without being connected, or may be both in contact and connected, so that the second electrode sheet b and the first diaphragm c are in a connected or unconnected bonding state.

[0406] Combination Fig.17, when the first composite sheet e does not contain the second diaphragm d, the unwinding of the second diaphragm d is not affected by the cutting, defect removal and other processes of the upstream first composite sheet e. The second diaphragm d can be unwound continuously (i.e., uninterrupted unwinding) as needed, so that the second diaphragm d can exceed the head and tail of the electrode sheet of each electrode assembly 200 (for example, the two sides of the electrode sheet in the length direction F3), thereby improving the effect of the second diaphragm d separating the first electrode sheet a and the second electrode sheet b in the process of winding the electrode assembly 200, which is conducive to reducing the risk of short circuit caused by the overlap of the second electrode sheet b and the first electrode sheet a, and the second diaphragms d of multiple electrode assemblies 200 can be connected during the transmission process, which improves the stability of the transmission and reduces the deviation of the electrode assembly 200 during the production process. In addition, the continuous unwinding of the second diaphragm d can save the continuous unwinding of the first diaphragm c, and only the unwinding of the second diaphragm d can exceed the head and tail of the electrode sheet and connect multiple electrode assemblies 200, which is conducive to saving materials and has good economic efficiency.

[0407] For example, in combination Fig.17 , the first polymerization mechanism 31 is a composite mechanism, and is used to fix the first pole piece a and the second pole piece b in the first composite piece e to the first diaphragm c. Thereby reducing the displacement of the first pole piece a relative to the first diaphragm c, the displacement of the second pole piece b relative to the first diaphragm c, and the displacement of the first pole piece a relative to the second pole piece b during winding and use, which is beneficial to improve the accuracy of the relative position between the materials, thereby improving the 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.

[0408] Exemplarily, 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 make the first electrode piece a and the second electrode piece b fit onto the first diaphragm c by gluing or other methods. For example, the first polymerization mechanism 31 can include two rollers arranged relatively at intervals, or can include a roller and a support arranged relatively at intervals with the roller, or can include multiple rollers or other structures; the roller in the first polymerization mechanism 31 can be a rotatable structure, or a fixed structure, or can float; the roller in the first polymerization mechanism 31 can also be an active roller or a passive roller.

[0409] For example, in combination Fig.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 of 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, and the first diaphragm c is located between the second electrode piece b and the first electrode piece a. That is, the first electrode piece a, the first diaphragm c and the second electrode piece b are connected together. Thereby, the relative positions of the first pole piece a, the first diaphragm c and the second pole piece b are fixed, and the first pole piece a, the first diaphragm c and the second pole piece b can be synchronously transported without being easily offset, which is beneficial to improving the position accuracy of the first pole piece a and the second pole piece b during the production process.

[0410] For example, combining Fig.17 When the first polymerization mechanism 31 is a composite mechanism, the first electrode piece a, the first diaphragm c and the second electrode piece b can be connected by heating, pressurizing and the like. The viscosity of the first diaphragm c can also be improved by using a first diaphragm c having a higher PVDF (polyvinylidene fluoride) content (for example, a content of 1 mg, 1.5 mg, or 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 piece a and the second electrode piece b, respectively, and reduce the displacement of the first electrode piece a relative to the first diaphragm c and the displacement of the second electrode piece b relative to the first diaphragm c during transportation, winding and use, which is beneficial to improving the accuracy of the relative positions between the materials.

[0411] For example, combining Fig.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 pole piece a, the first diaphragm c and the second pole piece b and apply a predetermined pressure along the thickness direction F1 to make the first pole piece a, the first diaphragm c and the second pole piece b bonded together to achieve a composite connection of the first pole piece a, the first diaphragm c and the second pole piece b.

[0412] For example, in combination Fig.18When the first polymerization mechanism 31 is a composite mechanism, the first polymerization mechanism 31 includes two composite rollers arranged opposite to each other. When the first electrode piece a, the first diaphragm c and the second electrode piece b are transferred 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, that is, the two composite rollers cooperate with each other 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 piece e. Both sides of the first diaphragm c are sticky, 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 are not easy to move relative to each other.

[0413] For example, in combination Fig.17 When the first polymerization mechanism 31 is a composite mechanism, the first detection device 71 is disposed downstream of the first polymerization mechanism 31, and the first detection device 71 can be used to detect the composite state of the first composite sheet e. That is, when the first polymerization mechanism 31 is a composite mechanism, the first detection device 71 is disposed downstream of the first polymerization mechanism 31, so that the first electrode a, the first diaphragm c and the second electrode b can be transferred to the first detection device 71 after being composited to form the first composite sheet e, so as to detect the composite state by using the first detection device 71. For example, composite defects such as folded corners, breakage, crushing and wrinkling of the electrode and diaphragm can be detected.

[0414] For example, combined with Fig.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.

[0415] In addition, combined Fig.17 The first detection device 71 can be arranged on one side or both sides of the material thickness direction F1 according to actual needs. For example, the first detection device 71 is arranged on both sides of the first composite sheet e thickness direction F1 to detect the relative position of the first electrode a and the second electrode b, and detect the defects of the second electrode b and the first electrode a. The first detection device 71 can detect multiple parts of the material length direction F3 in sequence during the material movement, or can continuously detect the material length direction F3.

[0416] 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 piece a, the second electrode piece b, and the first diaphragm c in the first composite piece e together without connecting them.

[0417] In some embodiments, in combination Fig.17 , since the first diaphragm c needs to be arranged between the first pole piece a and the second pole piece b, the third feeding mechanism 21 can be spatially located between the first feeding mechanism 11 and the second feeding mechanism 12, so that the spatial layout of the first polymerization mechanism 31 is more reasonable. It can be understood that each feeding mechanism and polymerization mechanism can be flexibly arranged and is not limited to the above arrangement. Exemplarily, in the height direction of the winding device 100, the first feeding mechanism 11, the third feeding mechanism 21, and the second feeding mechanism 12 are arranged in sequence from top to bottom, so that the first pole piece a, the first diaphragm c, and the second pole piece b are stacked from top to bottom.

[0418] Combination Fig.17 When the first composite sheet e does not contain the second diaphragm d, in some embodiments, the winding device 100 may also 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.

[0419] It is worth explaining 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 (i.e., 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 workstations, that is, the first composite sheet e formed by polymerization by 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.

[0420] The fourth feeding mechanism 22 is arranged 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 be used as the input material of the sixth polymerization mechanism 36. Thus, the sixth polymerization mechanism can polymerize 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.

[0421] Thus, by arranging the sixth polymerization mechanism 36 downstream of the first polymerization mechanism 31, the second diaphragm d provided by the sixth polymerization mechanism 36 can be firstly polymerized with the first composite sheet e and then put into the winding mechanism 40 together, so that the relative position of the second diaphragm d and the sixth composite sheet k is more reliable and not easy to move, which is conducive to improving the reliability of the second diaphragm d insulating the first pole sheet a from the second pole sheet b in the electrode assembly 200 after winding. In addition, by arranging the sixth polymerization mechanism 36 and the winding mechanism 40 at intervals, the problem of crowded space around the winding mechanism 40 (such as above) can be avoided, and the winding device 100 sets each unwinding mechanism separately from the winding mechanism 40, and the layout is flexible and convenient.

[0422] When the winding apparatus 100 includes the sixth polymerization mechanism 36, in some embodiments, in combination with Fig.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.

[0423] Combination Fig.17 When the sixth polymerization mechanism 36 is an edge sealing mechanism, the sixth polymerization mechanism 36 is arranged 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 and 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, pasting, etc. The winding mechanism 40 is arranged downstream of the sixth polymerization mechanism 36 and is used to wind the sixth composite sheet k. It is beneficial to reduce the risk of short circuit caused by the overlap of the second pole piece b and the first pole piece a, and reduce the risk of corrosion and leakage caused by the overlap of the second pole piece b and the shell 3011 of the battery cell 301.

[0424] In some embodiments, in combination Fig.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.

[0425] When making edge banding connections, combine Fig.17 When the sixth polymerization mechanism 36 is an edge sealing mechanism, the portion where the two layers of membranes are connected is the edge sealing. According to actual needs, the edge sealing on both sides of the width direction F2 of the two layers of membranes can extend continuously or discontinuously along the material conveying direction, which is within the protection scope of this application.

[0426] In some related technologies, the electrode sheet 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 sheet and the cathode electrode sheet.

[0427] In some embodiments of the present application, Fig.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.

[0428] 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 a sufficient edge to be edge sealed with the second diaphragm d, thereby improving the edge sealing quality.

[0429] Of course, the present application is not limited thereto, and the sixth polymerization mechanism 36 may not be an edge sealing mechanism. Fig.18 , the sixth polymerization mechanism 36 can also be only a conveying roller, the fourth feeding mechanism 22 is used to unwind the second separator d, and 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 body, and to convey the superimposed sheet body 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 body, and then the superimposed sheet body is conveyed to the winding mechanism 40 for winding. In this way, the mechanism can be simplified.

[0430] Combination Fig.17 and Fig.18 When the winding device 100 includes the sixth polymerization mechanism 36, in some embodiments, the winding device 100 also includes: a sixth detection device 76, the sixth detection device 76 is located between the sixth polymerization mechanism 36 and the winding mechanism 40, and is used to detect the sixth composite sheet k.

[0431] 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 workstations, that is, the sixth composite sheet k formed by the polymerization of the sixth polymerization mechanism 36 can be inspected by the sixth detection device 76 before entering the winding mechanism 40.

[0432] Exemplarily, the sixth detection device 76 may include a camera, a machine vision detection device or other structures. 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 may obtain image information (such as position, color, shape, etc.) of the sixth composite sheet k, and may convert the image information into a digital signal and send it to the controller, so that the controller can determine whether the sixth composite sheet k meets the requirements according to a preset program, for example, whether the second diaphragm d is offset, whether the second diaphragm d can cover the first pole piece a and the second pole piece b, etc. By adopting the above technical solution, the sixth detection device 76 is arranged between the sixth polymerization mechanism 36 and the winding mechanism 40, and can fully detect the state of the sixth composite sheet k, and the detection result can have a high accuracy.

[0433] 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 respectively arranged at both ends of the pole piece on one side of the material thickness direction F1.

[0434] Exemplarily, the sixth detection device 76 can be used to detect the relative position of the second diaphragm d and the second pole piece b, such as detecting the OH of the second diaphragm d enclosing the second pole piece b, that is, the size of the edge of the second diaphragm d exceeding the edge of the first pole piece a in the width direction F2 and the length direction F3, and the OH defect means that the size of the exceeding part does not meet the required size range. In addition, in some embodiments, the sixth detection device 76 can also be used to detect the relative position of the first pole piece a and the second pole piece b, the relative position of the first diaphragm c and the first pole piece a, etc.

[0435] like Fig.17As shown, exemplarily, when the sixth polymerization mechanism 36 is an edge sealing mechanism, the sixth detection device 76 can be used to detect the edge sealing state of the sixth composite sheet k. For example, edge sealing defects such as the folding angle of the pole piece, wrinkling of the head and tail, and dislocation of the diaphragm can be detected. For example, the relative position of the edge sealing formed by the first diaphragm c and the second diaphragm d and the second pole piece b can be detected, so as to adjust the diaphragm and the sixth polymerization mechanism 36 according to the detection results, so that the width and position of the formed edge sealing meet the requirements of the diaphragm wrapping the second pole piece b, improve the reliability of the edge sealing, and enable the diaphragm to play a reliable limiting and protective role for the second pole piece b. Therefore, by detecting the edge sealing state after the first pole piece a, the first diaphragm c, the second pole piece b and the second diaphragm d are stacked and the diaphragm is edge sealed to form the electrode assembly 200, more comprehensive detection can be achieved, the reliability of the edge sealing connection can be improved, and the risk of defect leakage during the production process of the electrode assembly 200 can be reduced. Improve the position accuracy of the first pole piece a, the first diaphragm c, the second pole piece b and the second diaphragm d.

[0436] In some embodiments, in combination Fig.17 When the winding device 100 includes the sixth polymerization mechanism 36, the third cutting mechanism 63 can be arranged between the sixth polymerization mechanism 36 and the winding mechanism 40. That is, the third cutting mechanism 63 cuts off the first diaphragm c and the second diaphragm d after the sixth polymerization mechanism 36 polymerizes the first composite sheet e and the second diaphragm d into the sixth composite sheet k. 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 is required, which can simplify the equipment, reduce costs, and save space. In addition, the winding device 100 can cut the diaphragm before or after the sixth composite sheet k is rolled, without consuming a separate diaphragm cutting time, thereby improving the overall winding efficiency.

[0437] Combination Fig.19 When the third cutting mechanism 63 is arranged between the sixth polymerization mechanism 36 and the winding mechanism 40, the winding device 100 also includes a first transmission member 91 arranged 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.

[0438] Combination Fig.19The sixth polymerization mechanism 36 is used for merging the second diaphragm 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. The third cutting mechanism 63 can cut the first diaphragm c and the second diaphragm d before the sixth composite sheet k is rolled. The third cutting mechanism 63 may include a variety of cutting structures, such as a straight line cutter that reciprocates along a straight line, a cam cutter 81 that rotates around an axis, a laser cutting structure, etc. The first transmission member 91 transports the sixth composite sheet k from the third cutting mechanism 63 to the winding needle 42. The first transmission member 91 may include a variety of transport structures, such as a clamp, a conveyor belt, etc.

[0439] Combination Fig.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 to facilitate the winding needle 42 to wind the next electrode assembly 200.

[0440] Combination Fig.19 The third cutting mechanism 63 provided in the embodiment of the present application is arranged on the feeding side of the winding mechanism 40, and uses the first transmission member 91 to transport the diaphragm or the sheet to the winding mechanism 40, so that the winding mechanism 40 can wind the electrode assembly 200. By adopting the above technical scheme, 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 with the method of cutting the membrane first and then transporting the membrane.

[0441] Combination Fig.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 .

[0442] Combination Fig.19 In some embodiments, the first transmission member 91 is a vacuum adsorption transmission belt.

[0443] The vacuum adsorption transmission belt refers to a transmission belt with the function of vacuum adsorption of diaphragms. The vacuum adsorption transmission belt is connected to a vacuum pumping device. The surface of the transmission belt is provided with vacuum adsorption holes. Under the vacuum pumping action of the vacuum pumping device, the vacuum adsorption holes adsorb the diaphragm to prevent the diaphragm from warping or shifting during the transmission process. In addition to adsorbing diaphragms, the vacuum adsorption transmission belt can also adsorb impurities such as debris and dust, reducing the negative impact that impurities may have on the diaphragm and the processing environment.

[0444] 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.

[0445] 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 lifted or deviated during the transmission process.

[0446] In some embodiments, in combination Fig.19 , the conveying speed of the vacuum adsorption transmission 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 winding speed of the electrode assembly 200 wound by the winding needle 42 at the winding station 4101, that is, the ratio of the length of the electrode assembly 200 to the time used for winding, which represents the length of the membrane wound by the winding needle 42 per unit time. The conveying speed of the vacuum adsorption transmission belt is the length of the membrane conveyed per unit time. By setting the conveying speed of the vacuum adsorption transmission belt equal to the winding speed of the winding needle 42, the tension of the membrane can be made zero, reducing the probability of deformation of the membrane due to excessive tension, and the vacuum adsorption transmission belt has a faster transmission speed and high transmission efficiency. It can be understood that the conveying speed of the vacuum adsorption transmission belt and the winding speed of the winding needle 42 may not be equal, as long as the two are adapted to make the tension of the membrane within a certain range.

[0447] Combination Fig.17 and Fig.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.

[0448] Combination Fig.17 and Fig.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 winding the first composite sheet e.

[0449] By adopting the above technical solution, the sixth buffer mechanism 86 can buffer and release the first composite sheet e, so that the winding mechanism 40 can continuously obtain the feed, thereby improving the winding efficiency. For example, the sixth buffer mechanism 86 can buffer 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 sixth buffer mechanism 86, the sixth buffer mechanism 86 can buffer 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.

[0450] For example, in combination Fig.17 and Fig.18 The sixth buffer mechanism 86 may include one or more rollers, and the first composite sheet e can enter the winding mechanism 40 after bypassing the one or more rollers of the sixth buffer mechanism 86. The length of the first composite sheet e cached on the sixth buffer mechanism 86 can be flexibly adjusted. Exemplarily, the sixth buffer mechanism 86 can store the first composite sheet e by winding, stacking, etc.

[0451] For example, in combination Fig.18 The sixth cache mechanism 86 includes a sixth fixed roller 861 and a sixth floating roller 862 which are arranged at intervals. The sixth fixed roller 861 is fixed relative to the first polymerization mechanism 31. 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 transmission direction of the first polymerization mechanism 31.

[0452] 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, and can also 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.

[0453] The sixth floating roller 862 refers to a roller body in the sixth cache 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 body, or a prismatic roller body or a roller body 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, and can also 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, and the sixth floating roller 862 can also be an active roller and rotate by being driven by a driving device such as a motor.

[0454] The sixth floating roller 862 can move in a direction close to and away from the sixth fixed roller 861. When the sixth floating roller 862 moves in a direction 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 in a direction close to the sixth fixed roller 861, the length of the first composite sheet e stored in the sixth buffer mechanism 86 decreases, and a portion of the first composite sheet e is released.

[0455] The floating of the sixth floating roller 862 can be passive floating or active floating. In some embodiments, the floating of the sixth floating roller 862 is achieved by elastic members such as springs and rubber strips, and the sixth floating roller 862 is passively floating; in other embodiments, the floating of the sixth floating roller 862 is achieved by active power devices such as cylinders and hydraulic cylinders, and the sixth floating roller 862 is actively floating.

[0456] The number of the sixth fixed rollers 861 may be one or two or more; the number of the floating rollers may be one or two or more; when the number of the sixth fixed rollers 861 and the sixth floating rollers 862 are both two or more, the sixth fixed rollers 861 and the sixth floating rollers 862 may be alternately arranged in sequence along the conveying path of the first composite sheet e.

[0457] 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.

[0458] During the production process, the sixth buffer mechanism 86 buffers the material and can continuously transfer the material downstream, so that the third cutting mechanism 63 can perform the cutting operation without deceleration and is not affected by the complex operation upstream of the sixth buffer mechanism 86. Fig.17As shown, the composite precision requirement is relatively high, resulting in a slow operating speed. The sixth cache mechanism 86 is used to cache the first composite sheet e after the first electrode sheet a, the first diaphragm c and the second electrode sheet b are composited. The third cutting mechanism 63 is used to cut off the second diaphragm d connected between adjacent electrode assemblies 200. The precision requirement is relatively low and the operating speed is relatively fast. Through the caching of the sixth cache mechanism 86, the composite speed of the first polymerization mechanism 31 is reduced. During the process, the sixth cache mechanism 86 can stably and continuously transmit the first composite sheet e to the sixth polymerization mechanism 36 without reducing the edge sealing rate, and then the third cutting mechanism 63 can cut the strip electrode assembly 200 without deceleration, thereby improving the winding efficiency and thus improving the overall production capacity.

[0459] In some embodiments, in combination Fig.18 When the winding device 100 includes the sixth buffer mechanism 86, the first cutting mechanism 61 may be disposed between the first feeding mechanism 11 and the first aggregation mechanism 31, and the second cutting mechanism 62 may be disposed between the second feeding mechanism 12 and the first aggregation mechanism 31.

[0460] In this way, when the first electrode sheet a and the second electrode sheet b are pre-cut before the first polymerization mechanism 31, the sixth buffer mechanism 86 can buffer and release the first composite sheet e, thereby ensuring that the winding mechanism 40 does not affect the winding of the electrode sheet when the electrode sheet is cut, which significantly improves the winding efficiency. In addition, the first cutting mechanism 61 and the second cutting mechanism 62 can be arranged away from the winding mechanism 40 in space, so as to solve the adverse effect of the cutting chips falling into the electrode assembly 200 wound on the winding needle 42 on the quality of the electrode assembly 200, thereby facilitating further improving the quality of the electrode assembly 200.

[0461] In some embodiments, in combination Fig.18 When the first composite sheet e does not include the second diaphragm d, for example, in some embodiments, the combination Fig. 20 , the first electrode piece a, the first diaphragm c and the second electrode piece b can be fed into the first polymerization mechanism 31 separately. That is, before feeding into the first polymerization mechanism 31, the first diaphragm c is not pre-stacked with any of the first electrode piece a and the second electrode piece b, so that the mechanism can be simplified, and the polymerization mechanism upstream of the first polymerization mechanism 31 is omitted, thus saving space occupation.

[0462] When the winding device 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, and 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 disposed between the sixth buffer mechanism 86 and the sixth polymerization mechanism 36, defects of 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 to improving the quality of the electrode assembly 200 used for production.

[0463] Of course, when the first composite sheet e does not include 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. Details will not be elaborated here.

[0464] The winding device 100 may also not include the sixth polymerization mechanism 36, for example, in combination with Fig. 20 and Fig.21 In some embodiments, the fourth feeding mechanism 22 and the first composite sheet e are aggregated at the winding mechanism 40. At this time, the fourth feeding mechanism 22 is not disposed downstream of the first aggregation mechanism 31, but is disposed on one side of the winding mechanism 40.

[0465] Combination Fig. 20 and Fig.21 The fourth feeding mechanism 22 is arranged 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.

[0466] So, combined Fig. 20 and Fig.21 , the fourth feeding mechanism 22 directly delivers the second separator d to the winding mechanism 40, so that the first composite sheet e delivered by the first polymerization mechanism 31 and the second separator d delivered by the fourth feeding mechanism 22 are wound together. In this way, the fourth feeding mechanism 22 can directly deliver the second separator d to the winding device 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. In this way, the mechanism can be simplified, and the polymerization mechanism downstream of the first polymerization mechanism 31 is omitted, saving space occupation.

[0467] Combination Fig.21 The third cutting mechanism 63 can be provided in two parts, one third cutting mechanism 63 is provided between the first polymerization mechanism 31 and the winding mechanism 40 and is used to cut the first diaphragm c, and the other third cutting mechanism 63 is provided between the fourth feeding mechanism 22 and the winding mechanism 40 and is used to cut the second diaphragm d. Fig.21The winding device 100 may also include a second transmission member 92 and a third transmission member 93. The second transmission member 92 and the third transmission member 93 are respectively arranged 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 diaphragm d. The third cutting mechanism 63 may include a cam cutter, or a cutter that reciprocates along a straight line, a laser cutter, etc. By adopting the above technical solution, the first diaphragm c and the second diaphragm d are both cut before winding, and the third cutting mechanism 63 does not occupy the space of the winding mechanism 40, and there is no need to avoid the winding needle 42 rotating with the turret 41.

[0468] Below, refer to Figure 4 , describing a winding device 100 according to some specific implementations of the present application.

[0469] Reference Figure 4 The winding device 100 mainly includes a feeding mechanism, a cutting mechanism, a polymerization mechanism, a detection component, a buffer mechanism and a winding mechanism.

[0470] Reference Figure 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).

[0471] The first feeding mechanism 11 is used for winding the first electrode sheet a and releasing the first electrode sheet a; the second feeding mechanism 12 is used for winding the second electrode sheet b and releasing the second electrode sheet b; the third feeding mechanism 21 is used for winding the first diaphragm c and releasing the first diaphragm c; the fourth feeding mechanism 22 is used for winding the second diaphragm d and releasing the second diaphragm d.

[0472] Reference Figure 4 , the polymerization mechanism may include a first polymerization mechanism 31 and a second polymerization mechanism 32, and the winding mechanism 40 may include a turret 41 and five winding needles 42 arranged on the turret 41, and the winding needles 42 are used to wind the stacked pole pieces and diaphragms. The winding mechanism 40 also includes a finishing assembly 43, and the finishing machine assembly 43 includes a finishing roller 431 and a glue-applying roller 432. A material unloading mechanism 50 is also provided next to the turret 41. The material unloading mechanism 50 may include a clamp 51 and a platform 52, or may also include a manipulator or other structures; the clamp 51 is used to remove the wound electrode assembly 200 from the winding needle 42, and the platform 52 is used to carry and transport the electrode assembly 200 removed by the clamp 51, so that the subsequent process can obtain the wound electrode assembly 200 from the platform 52.

[0473] Reference Figure 4, the tail roller 431 is used to press the pole piece 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 after the first composite sheet e is wound on the winding needle 42, the tail end of the pole piece and the tail end of the diaphragm are easy to separate and warp, so the main function of the tail roller 431 is to press the tail end of the first composite sheet e, so as to reduce the separation of the pole piece and the diaphragm at the tail end of the first composite sheet e, and increase the stability of the bonding between the pole piece and the diaphragm in the first composite sheet e. The tail structure 43 of this embodiment includes a tail roller 431, so that the pole piece and the diaphragm are pressed against the winding needle 42 by the tail roller 431, and the pole piece and the diaphragm are pressed together by the pressure of the tail roller 431, so as to reduce the separation of the pole piece and the diaphragm.

[0474] Reference Figure 4 , the glue roller 432 is used to fix the diaphragm to the pole piece. The glue roller 432 refers to the structure in the tail structure 43 used to glue on the pole piece. The glue roller 432 can stick adhesive paper, tape and 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 that the tail end of the first composite sheet e is lifted, and can also further reduce the situation that the pole piece 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 pole piece 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 pole piece and the diaphragm and obtain a first composite sheet e with a relatively stable connection and not easy to fall apart, thereby reducing the situation that the pole piece and the diaphragm are separated.

[0475] Reference Figure 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.

[0476] The electrode piece cutting mechanism may include a variety of cutting mechanisms, such as a straight line cutter that reciprocates along a straight line, a cam cutter that rotates around an axis, etc.; the electrode piece cutting mechanism may choose to use a cutting mechanism that cuts off the cathode electrode piece or a cutting mechanism that cuts off the anode electrode piece as needed. The diaphragm cutting mechanism may include a variety of cutting mechanisms, such as a straight line cutter that reciprocates along a straight line, a cam cutter that rotates around an axis, etc.

[0477] According to the structure of the electrode assembly 200, the electrode assembly 200 generally includes a first diaphragm c and a second diaphragm d. In this case, the third cutting mechanism 63 may include only a cutting mechanism for cutting the first diaphragm c, or only a cutting mechanism for cutting the second diaphragm d, or may include both a cutting mechanism for cutting the first diaphragm c and a cutting mechanism for cutting the second diaphragm d, or may be a cutting mechanism capable of simultaneously cutting the first diaphragm c and the second diaphragm d. The third cutting mechanism 63 is disposed upstream of the winding mechanism 40, so that the third cutting mechanism 63 can cut the diaphragm before the diaphragm enters the winding mechanism 40. The third cutting mechanism 63 may be disposed downstream of the first polymerization mechanism 31 or upstream of the first polymerization mechanism 31 as required.

[0478] Reference Figure 4 The electrode sheet cutting mechanism is located upstream of the first polymerization mechanism 31, and the diaphragm cutting mechanism is disposed between the first polymerization mechanism 31 and the winding mechanism 40. The electrode sheet cutting mechanism can cut the electrode sheet before the electrode sheet and the diaphragm are polymerized, and the diaphragm cutting mechanism can cut the diaphragm after the electrode sheet and the diaphragm are polymerized. This arrangement can easily make the length of the diaphragm greater than the length of the electrode sheet, thereby meeting the design requirements of the electrode assembly 200.

[0479] Reference Figure 4 The first cutting mechanism 61 includes a first cutter 611 and a first abutting member 612 which are arranged relatively at intervals. The second cutting mechanism 62 includes a second cam cutter 621 and a second abutting member 622 which are arranged relatively at intervals. The third cutting mechanism 63 includes a second cam cutter 631 and a third abutting member 632 which are arranged relatively at intervals.

[0480] Reference Figure 4 The first electrode a and the 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 b into a first composite sheet e. After the first electrode a and the first diaphragm c are composited by the second aggregation mechanism 32, they are aggregated with the second electrode 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 a, the first diaphragm c, the second electrode b, and the second diaphragm d are stacked in sequence; the second cam cutter 631 provided between the first aggregation mechanism 31 and the winding mechanism 40 cooperates with the third abutting member 632 to cut the first diaphragm c and the second diaphragm d in the first composite sheet e to form a single complete first composite sheet e.

[0481] Reference Figure 4The 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.

[0482] Reference Figure 4 , the detection component is arranged upstream of the winding mechanism 40. The detection component includes a first detection device 71 and a second detection device 72, the first detection device 71 is arranged between the first polymerization mechanism 31 and the winding mechanism 40, and the second detection device 72 is arranged between the second polymerization mechanism 32 and the first cache mechanism 81. The detection component may include a camera, a machine vision detection device or other structures, and the detection component may also include other devices such as a control device. The detection component can obtain image information (such as position, color, shape, etc.), and can convert the image information into a digital signal and send it to the control device, so that the control device can judge whether the pole piece, diaphragm or composite sheet meets the requirements according to a preset program.

[0483] 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 slightly different from 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.

[0484] Exemplarily, the first pole piece a is a cathode pole piece, the second pole piece b is an anode pole piece, in the first composite piece e, the second pole piece b is stacked between the first diaphragm c and the second diaphragm d, and there are detection devices (i.e., the second detection device 72 and the first detection device 71) after the second polymerization mechanism 32 and after the first polymerization mechanism 31, so that the OH full detection of the pole piece winding and ending can be achieved. The problem of missing the head and tail OH cannot be detected when the positive and negative pole pieces are respectively wound at the winding needle in the related art.

[0485] In some embodiments, reference Figure 4The winding device 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 polymerization mechanism 32, and is used to transport the first pole piece a. The fifth transmission member 95 is disposed between the second feeding mechanism 12 and the second cutting mechanism 62, and the sixth transmission member 96 is disposed between the second cutting mechanism 62 and the first polymerization mechanism 31, and is used to transport the second pole piece b. For example, the transmission member may be a vacuum conveyor belt, a reciprocating conveying trolley, a sheet feeding mechanism or other structures.

[0486] After the first cutting mechanism 61 cuts off the first electrode piece a, the tail end of the first electrode piece a is not easy to fix. The first electrode piece a after being cut off is transported by the fourth transmission member 94, which can play a role in fixing 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 off the second electrode piece b, the tail end of the second electrode piece b is not easy to fix. The second electrode piece b after being cut off is transported by the fifth transmission member 95 and the sixth transmission member 96, which can play a role in fixing the second electrode piece b, thereby reducing the movement of the tail end of the second electrode piece b.

[0487] For example, the transmission member is a vacuum adsorption conveyor belt, the principle of which is to use vacuum adsorption to adsorb materials on the conveyor belt, and to transport the materials to the desired location through the conveyor belt; the transmission member is a vacuum adsorption conveyor belt, so that in addition to being able to transport the first pole piece a and the second pole piece b, the transmission member can also adsorb metal debris, dust and other impurities that may be generated during the cutting process of the first pole piece a and the second pole piece b, thereby reducing the negative impact that may be caused to the pole piece, the diaphragm and the processing environment. In this embodiment, the second pole piece b and the first pole piece a are transported by the transmission member to increase the stability of the transportation and reduce the occurrence of situations such as loss of transportation power after the pole piece is cut off.

[0488] Below, refer to Figure 5 , describing a winding device 100 according to some specific implementations of the present application.

[0489] refer to Figure 5 The winding device 100 includes: a second feeding mechanism 12, a first feeding mechanism 11, a third feeding mechanism 21, a fourth feeding mechanism 22, a first polymerization mechanism 31, a second polymerization mechanism 32, a second detection device 72, a first detection device 71, a first buffer mechanism 81, a first cutting mechanism 61, a second cutting mechanism 62, a third cutting mechanism 63, a winding mechanism 40, and a conveying roller disposed between the mechanisms, the conveying roller is used to convey the material. The first polymerization mechanism 31 is an edge sealing mechanism, and the second polymerization mechanism 32 is a compound mechanism.

[0490] refer to Figure 5The first polymerization mechanism 31 is an edge sealing mechanism for sealing and connecting the edges of the first diaphragm c and the second diaphragm d on both sides of the second electrode piece b in the width direction F2 to obtain a first composite piece e. The second polymerization mechanism 32 is used to composite the first electrode piece a (for example, the cathode electrode piece) with the first diaphragm c to obtain a second composite piece f. The first detection device 71 is arranged downstream of the first polymerization mechanism 31 and is capable of detecting the edge sealing state of the first composite piece e. The second detection device 72 is arranged downstream of the second polymerization mechanism 32 and is capable of detecting the composite state of the second composite piece f.

[0491] refer to Figure 5 The composite mechanism is arranged upstream of the edge sealing mechanism. The composite mechanism is used to composite the first pole piece a and the first diaphragm c to form a second composite piece f. After the second composite piece f is transferred to the edge sealing mechanism, the edge sealing mechanism is used to seal the second pole piece b, the second composite piece f and the second diaphragm d to form a first composite piece e.

[0492] refer to Figure 5 The second composite sheet f is a sheet body obtained by compositely 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.

[0493] refer to Figure 5 The first electrode sheet a and the first diaphragm c are firstly compounded by the second polymerization mechanism 32 to obtain the second composite sheet f, and then the second composite sheet f, the second electrode sheet b and the second diaphragm d are sealed by the first polymerization mechanism 31 to obtain the unwound electrode assembly 200, and finally wound into the electrode assembly 200 by the winding mechanism 40.

[0494] 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 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, the electrode damage and other composite conditions. 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 first diaphragm c, the second diaphragm d wrinkling and other edge sealing conditions. In this way, it is possible to achieve a 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.

[0495] Exemplarily, the first pole piece a is a cathode pole piece, the second pole piece b is an anode pole piece, and in the first composite piece e, the second pole piece b is stacked between the first diaphragm c and the second diaphragm d. There are detection devices (i.e., the second detection device 72 and the first detection device 71) 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 angle, and pole piece damage. The first detection device 71 is installed after the first polymerization mechanism 31 and before the serpentine correction, and can detect edge sealing defects such as double-sided OH of the anode pole piece and the cathode pole piece in the first composite piece e, pole piece folding angle, and diaphragm wrinkling. 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 pole piece is unwound and before the first cutting mechanism 61, and can detect defects such as AT11 width on the front and back sides of the cathode and bad products (such as bad products with yellow labels), and pole 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 and cathode of two adjacent turns of the first composite sheet e on the winding mechanism 40 to avoid OH leakage.

[0496] Below, refer to Fig.11 , describing a winding device 100 according to some specific implementations of the present application.

[0497] refer to Fig.11 The winding device 100 includes: a second feeding mechanism 12, a first feeding mechanism 11, a third feeding mechanism 21, a fourth feeding mechanism 22, a first polymerization mechanism 31, a fifth polymerization mechanism 35, a first detection device 71, a fifth detection 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 a conveying roller disposed between the mechanisms, the conveying roller is used to convey the material. The first polymerization mechanism 31 is a compound mechanism, and the fifth polymerization mechanism 35 is an edge sealing mechanism.

[0498] The first diaphragm c and the second diaphragm d compositely cover the second pole piece b and the portions of the first diaphragm c and the second diaphragm d extending beyond the second pole piece b are sealed to obtain a fifth composite sheet j, and the fifth composite sheet j is then composited with the first pole piece a to form a first composite sheet e.

[0499] 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 electrode, the first diaphragm c, and the second diaphragm d and other edge sealing conditions. 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 double-sided 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 first diaphragm c, and the second diaphragm d wrinkling and other conditions. In this way, a comprehensive inspection of the electrode assembly 200 produced by the edge sealing composite winding method can be achieved to avoid the omission of composite edge sealing defects such as electrode OH leakage, head wrinkling, and electrode crushing.

[0500] Exemplarily, the first pole piece a is a cathode pole piece, the second pole piece b is an anode pole piece, in the first composite piece e, the second pole piece b is stacked between the first diaphragm c and the second diaphragm d, and there are detection devices (i.e., the fifth detection device 75 and the first detection device 71) after the fifth polymerization mechanism 35 and after the first polymerization mechanism 31, so that the OH full detection of the pole piece winding and tailing can be achieved. The problem of missing the head and tail OH cannot be detected when the positive and negative pole pieces are respectively wound and inspected at the winding needle in the related art is solved.

[0501] Below, refer to Fig.12 and Fig.13 , describing a winding device 100 according to some specific implementations of the present application.

[0502] refer to Fig.12 and Fig.13 The winding device 100 includes a first polymerization mechanism 31, a fifth polymerization mechanism 35, a winding mechanism 40, a fifth cache mechanism 85, a fourth cache mechanism 84, a fifth detection device 75 and a first detection device 71. The fifth polymerization mechanism 35 is used to stack and compound the second diaphragm d, the second pole piece b and the first diaphragm c in sequence to form a fifth composite sheet j. The first polymerization mechanism 31 is used to stack and compound the fifth composite sheet j and the first pole piece a to form a first composite sheet e. The winding mechanism 40 is used to wind the first composite sheet e to form an electrode assembly 200. The fifth cache mechanism 85 is arranged between the first polymerization mechanism 31 and the winding mechanism 40, and the first detection device 71 is arranged between the first polymerization mechanism 31 and the fifth cache mechanism 85. The fourth cache mechanism 84 is arranged between the fifth polymerization mechanism 35 and the first polymerization mechanism 31, and the fifth detection device 75 is arranged between the fifth polymerization mechanism 35 and the fourth cache mechanism 84.

[0503] The fifth detection device 75 can detect the fifth composite sheet j, so as to obtain the composite conditions of at least two of the fifth composite sheet j. The first detection device 71 can detect the first composite sheet e, so as to obtain the composite conditions of the first electrode sheet a and the fifth composite sheet j. That is, the fifth detection device 75 can detect the composite conditions of the second electrode sheet b, the second diaphragm d and the first diaphragm c, and the first detection device 71 can detect the composite conditions of the fifth composite sheet j and the first electrode sheet a. In this way, the quality of the first composite sheet e can be strictly controlled, which can help improve the quality of the electrode assembly 200.

[0504] The first detection device 71 and the fifth detection device 75 can be but are not limited to CCD (charge coupled device) cameras.

[0505] Below, refer to Fig.14 , describing a winding device 100 according to some specific implementations of the present application.

[0506] refer to Fig.14 The winding device 100 includes two production devices, which are respectively 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 pole piece b, the first diaphragm c and the second diaphragm d are pressed together to form a fifth composite sheet j. In the second device 102, the first pole piece a and the fifth composite sheet j are pressed together to form a first composite sheet e.

[0507] refer to Fig.14 In the first device 101, the first diaphragm c and the second diaphragm d are respectively tightly attached to the two opposite surfaces of the second pole piece b in the thickness direction. The first diaphragm c, the second pole piece b and the second diaphragm d are pressed together to form a fifth composite sheet j, and the fifth composite sheet j is kept flat and transferred to the second device 102. The fifth composite sheet j is in a flat state, which means that the fifth composite sheet j is not wound and can extend along a straight line. The fifth composite sheet j enters the second device 102, is pressed together with the first pole piece a to form a first composite sheet e, and the first composite sheet e is flat and transferred to the winding mechanism 40, and is wound in the winding mechanism 40.

[0508] refer to Fig.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.

[0509] refer to Fig.14, the first detection device 71 is used to detect the relative position of the second pole piece b and the first pole 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 pole piece b and the first pole piece a, so as to ensure that the position of the fifth composite sheet j and the first pole piece a pressed together is correct. The fifth composite sheet j and the first pole piece a are pressed together by the first polymerization mechanism 31 to form the first composite sheet e.

[0510] refer to Fig.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 the poor relative position of the second pole piece b and the first pole piece a.

[0511] Before the second cutting mechanism 62 cuts the second electrode piece b, the second electrode piece b extends along the conveying direction L, and the second insert feeding mechanism 98, the first conveyor belt 14 and the adsorption plate sequentially adsorb the tail and the head of the second electrode piece b along the conveying direction L. After the second electrode piece b is cut, the second insert feeding mechanism 98 and the first deviation correction device 66 correct the positions of the head and the tail of the second electrode piece b, and the first conveyor belt 14 and the adsorption plate adsorb the second electrode piece b. The second electrode piece b is laminated and compounded with the first diaphragm c and the second diaphragm d by the fifth polymerization mechanism 35 to form a three-layer fifth composite sheet j.

[0512] The fifth composite sheet j enters the second device 102 through the conveying roller, and the third cutting mechanism 63 of the second device 102 cuts the first diaphragm c and the second diaphragm d in the fifth composite sheet j so that the size of the first diaphragm c and the second diaphragm d matches the second electrode b. Before cutting the first diaphragm c and the second diaphragm d, the first insert feeding mechanism 97, the second conveyor belt 15 and the adsorption plate sequentially adsorb the tail and the head of the fifth composite sheet j along the conveying direction L. After cutting the first diaphragm c and the second diaphragm d, the first insert feeding mechanism 97 adsorbs 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 adsorption plate adsorb the previous fifth composite sheet j. The first polymerization mechanism 31 in the second device 102 presses the fifth composite sheet j with the first electrode a to form the first composite sheet e. The position of the head and tail of the electrode component is detected and corrected by the first detection device 71.

[0513] Below, refer to Fig.15 , describing a winding device 100 according to some specific implementations of the present application.

[0514] See also Fig.15The 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 pole piece b and the diaphragm, and the first polymerization mechanism 31 is used to press the second pole piece b, the first pole piece a and the diaphragm.

[0515] Before the second pole piece b and the diaphragm are pressed together, a sixth transmission member 96 is provided, which can transport the second pole piece b. The adsorption holes opened on the sixth transmission member 96 have negative pressure, and the second pole piece b can stably move to the area of ​​the fifth polymerization mechanism 35 under the action of the sixth transmission member 96.

[0516] Before the second pole piece b, the first pole piece a and the diaphragm are pressed together, a fourth transmission member 94 is provided, which can transport the first pole piece a. The adsorption holes on the fourth transmission member 94 have negative pressure, and the first pole piece a can stably move to the area of ​​the first polymerization mechanism 31 under the action of the fourth transmission member 94, so that the second pole piece b, the first pole piece a and the diaphragm form a first composite piece e.

[0517] 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 that the relative position of the second electrode piece b and the first electrode piece a is correct. Then, the first composite sheet e is further transported to the area where the winding mechanism 40 is located, thereby completing the winding of the electrode assembly 200.

[0518] 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.

[0519] Specifically, the first detection device 71 can detect the positions of the head, tail, and multiple points in the middle of the second pole piece b in the length direction, and can detect the positions of the head, tail, and multiple points in the middle of the first pole piece a in the length direction. Combined with the positions of multiple parts of the second pole piece b and the first pole piece a, the relative positions of multiple parts of the second pole piece b and the first pole piece a in the length direction can be determined. For example, the relative position of the head of the second pole piece b in the length direction and the head of the first pole piece a in the length direction.

[0520] 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.

[0521] The first detection device 71 includes an X-ray camera. Specifically, the X-ray camera can detect the relative positions of multiple parts of the second pole piece b and the first pole piece a in the length direction, and the X-ray camera can penetrate the diaphragm to detect the positions of multiple parts of the second pole piece b located in the inner layer.

[0522] 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.

[0523] Below, refer to Fig.17 , Figure 23-Figure 28 , describing a winding device 100 according to some specific implementations of the present application.

[0524] Please refer to Fig.17 The first pole piece a, the second pole piece b and the first diaphragm c are unwound, and the first pole piece a and the second pole piece b wrap the first diaphragm c in the middle and are compounded together through the first polymerization mechanism 31 to form a first composite piece e. Then, the first composite piece e passes through the sixth buffer mechanism 86 and is sealed with the second diaphragm d through the sixth polymerization mechanism 36 to form a sixth composite piece k. The winding device 100 also includes a first detection device 71, a sixth detection device 76, a seventh detection device 77, an eighth detection device 78, a ninth detection device 791, and a tenth detection device 792.

[0525] 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 sheet e, the second electrode piece b is stacked between the first diaphragm c and the second diaphragm d.

[0526] 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, the electrode metal leakage / breakage and other incoming material defects;

[0527] The ninth detection device 791 is installed after the anode electrode is unwound, and is used to detect anode damage, electrode film width and yellow-labeled defective products, electrode cracking / metal leakage and other incoming material defects;

[0528] The first detection device 71 is installed behind the sixth buffer mechanism 86 and before the sixth polymerization mechanism 36, and is used to detect composite defects such as breakage, crushing, and wrinkl...

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, characterized in that: 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, characterized in that 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, characterized in that 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, characterized in that: 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, characterized in that 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, characterized in that 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, characterized in that: 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, characterized in that 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, characterized in that: 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, characterized in that The second cutting mechanism includes a cam cutter.

11. The winding device according to any one of claims 3 to 5, characterized in that: 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, characterized in that 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, characterized in that 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, characterized in that 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 device according to claim 14, characterized in that 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 device according to claim 2, characterized in that 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 device according to claim 16, characterized in that 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 device according to claim 16, characterized in that 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, characterized in that 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, characterized in that 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, characterized in that 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 device according to claim 21, characterized in that 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, characterized in that 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 device according to claim 23, characterized in that 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, characterized in that 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 device according to claim 1, characterized in that The aggregation position of the second diaphragm and the first composite sheet is located downstream of the first detection device.

27. The winding device according to claim 26, characterized in that 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. The winding device according to claim 26 or 27, characterized in that 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 device according to claim 28, characterized in that 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 device according to claim 28 or 29, characterized in that 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. The winding device according to any one of claims 28 to 30, characterized in that 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. The winding device according to any one of claims 26 to 31, characterized in that 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 device according to claim 31, characterized in that 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 device according to any one of claims 26 to 33, characterized in that The first pole piece, the first diaphragm and the second pole piece are separately fed into the first polymerization mechanism.

35. A winding device according to any one of claims 26 to 34, characterized in that The fourth feeding mechanism and the first composite sheet are assembled at the winding mechanism.

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

37. A battery production line, characterized in that: 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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