Winding apparatus, winding method, and battery manufacturing apparatus

Abstract

The invention is suitable for the technical field of batteries, and provides winding equipment, a winding method and battery manufacturing equipment. The winding equipment comprises an unwinding mechanism, a gluing mechanism, a pressing mechanism and a winding mechanism, the unwinding mechanism is used for unwinding a first diaphragm, a first pole piece, a second diaphragm and a second pole piece, the first diaphragm is provided with a first surface, and the gluing mechanism comprises two gluing pieces arranged at intervals; the two gluing pieces are used for gluing the edges of the two opposite sides of the first surface respectively so as to form edge sealing areas on the two side edges of the first surface respectively, and the pressing mechanism is used for pressing the first diaphragm, the first pole piece, the second diaphragm and the second pole piece to form a laminated piece body and bonding the edge sealing areas with the second diaphragm; the winding mechanism is used for winding the laminated sheet body to form an electrode assembly. According to the technical scheme provided by the embodiment of the invention, the technical problems that the diaphragm is easy to shift and the edge of the diaphragm is easy to fold in the manufacturing process of the electrode assembly can be solved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a winding device, a winding method and a battery manufacturing device. Background Art

[0002] In the production process of batteries, the winding of electrode assemblies is a very important process. At present, the commonly used winding equipment can stack the cathode sheet, anode sheet and two layers of diaphragms in a certain order and then wind them to form an electrode assembly. However, due to the lack of a reliable fixing structure, problems such as diaphragm edge folding and diaphragm displacement are prone to occur during the winding process. These problems not only affect the appearance of the electrode assembly, but in severe cases can also cause internal short circuits in the electrode assembly, thereby affecting the overall performance and reliability of the battery. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a winding device, a winding method and a battery manufacturing device, which are used to solve the technical problems that the diaphragm is easily displaced and the edge of the diaphragm is easily folded during the production of the electrode assembly.

[0004] An embodiment of the first aspect of the present application provides a winding device, including: an unwinding mechanism, used to unwind a first diaphragm, a first electrode sheet, a second diaphragm and a second electrode sheet, the first diaphragm having a first surface; a gluing mechanism, arranged on the discharge side of the unwinding mechanism, the gluing mechanism being used to apply glue to the edge of at least one side of the first surface to form a sealing edge area on the first surface; a pressing mechanism, arranged on the discharge side of the gluing mechanism, the pressing mechanism being used to press the first diaphragm, the first electrode sheet, the second diaphragm and the second electrode sheet to form a stacked sheet body, and to bond the sealing edge area to the second diaphragm; a winding mechanism, arranged on the discharge side of the pressing mechanism, the winding mechanism being used to wind the stacked sheet body to form an electrode assembly.

[0005] In the above embodiment, the discharge side of the unwinding mechanism is provided with a gluing mechanism and a pressing mechanism in sequence. The gluing mechanism can apply glue on the first surface of the first diaphragm and form a sealing edge area on the edge of at least one side of the first surface. The pressing mechanism can press the first diaphragm, the first electrode piece, the second diaphragm and the second electrode piece to form a stacked sheet body, and bond the sealing edge area of ​​the first diaphragm to the second diaphragm. In this way, in the stacked sheet body transmitted to the winding mechanism, the edges of at least one side of the first diaphragm and the second diaphragm are bonded and fixed, which makes the positions of the first diaphragm and the second diaphragm remain relatively stable during the winding process, thereby effectively reducing the risk of displacement of the first diaphragm and the second diaphragm or folding of the diaphragm edges due to lack of fixation. At the same time, since the layers of materials in the stacked sheet body are relatively tightly combined, when auxiliary winding is performed using a vacuum winding needle or other device, the vacuum winding needle can adsorb the entire stacked sheet body, thereby avoiding the problem of only adsorbing the inner diaphragm and causing the outer diaphragm to fold or slip due to insufficient adsorption force. The above-mentioned winding equipment can be used to manufacture electrode assemblies, and can solve the problem of folding and displacement of the diaphragm during the manufacturing process, effectively improving the product quality and product yield of the electrode assembly, and improving the reliability of the electrode assembly and related battery devices.

[0006] In some embodiments, the winding device further includes a first composite mechanism disposed between the glue coating mechanism and the pressing mechanism, and the first composite mechanism is used to bond the first diaphragm and the first pole piece to form a first composite sheet body.

[0007] By adopting the above design, the first pole piece and the first diaphragm are pre-pressed using the first composite mechanism, so that the alignment accuracy between the two can be improved, and the first composite sheet formed by pressing the first pole piece and the first diaphragm has higher mechanical strength, which is conducive to reducing the risk of displacement or folding of the first pole piece and the first diaphragm during the subsequent pressing process of the overlapping sheets.

[0008] In some embodiments, the winding device further includes a first cutting device, which is disposed on the feeding side of the first composite mechanism and is used to cut off the first pole piece, and the first cutting device includes a cam cutter.

[0009] By adopting the above design and using the cam cutter to cut off the first pole piece, the occurrence of deceleration or shutdown of the winding equipment can be reduced, thereby facilitating improving the production efficiency of the winding equipment.

[0010] In some embodiments, the winding device further includes a resisting member, which is arranged opposite to the first cutting device and is used to support the first pole piece, and the first cutting device is used to cut off the first pole piece on the resisting member.

[0011] With the above design, the abutting member can provide reliable support for the first pole piece, preventing the first pole piece from being deformed or shifted due to cutting pressure during the cutting process, thereby ensuring that the first cutting device can smoothly cut the first pole piece.

[0012] In some embodiments, the abutting member is a vacuum suction roller.

[0013] With the above design, the vacuum adsorption roller fixes the first pole piece by adsorbing it through air pressure, which is not easy to damage the first pole piece; in addition, the vacuum adsorption roller can rotate and drive the first pole piece forward, which can also reduce the wear of the first pole piece when it passes through the abutment.

[0014] In some embodiments, the winding device further includes a conveying member disposed between the first cutting device and the first composite mechanism, and the conveying member is used to convey the first pole piece.

[0015] By adopting the above design, a conveying member is provided to fix the first pole piece after being cut, thereby improving the conveying stability of the first pole piece. At the same time, in some cases, the conveying member can also provide conveying power to avoid the problem of lack of conveying power that may occur due to cutting of the first pole piece.

[0016] In some embodiments, the conveyor comprises a vacuum conveyor belt.

[0017] With the above design, the contact area between the vacuum adsorption conveyor belt and the first electrode piece is larger, so the first electrode piece can be stably adsorbed and conveyed. The first electrode piece is not prone to warping, shifting or slipping during the conveying process. Moreover, since the vacuum adsorption conveyor belt fixes the first electrode piece through air pressure, no pressure loss will be caused to the first electrode piece during the conveying process.

[0018] In some embodiments, the winding device further includes a second composite mechanism disposed on the feeding side of the pressing mechanism, and the second composite mechanism is used to make the second diaphragm and the second pole piece fit together to form a second composite sheet body.

[0019] By adopting the above design, the second pole piece and the second diaphragm are pre-pressed using the second composite mechanism, which can improve the alignment accuracy between the two, and the second composite sheet formed by pressing the second pole piece and the second diaphragm has higher mechanical strength, which is conducive to reducing the risk of displacement or folding of the second pole piece and the second diaphragm during the subsequent pressing process of the overlapping sheets.

[0020] In some embodiments, the winding equipment also includes a second cutting device and a gluing mechanism. The second cutting device is arranged on the feeding side of the second composite mechanism, and the second cutting device is used to cut off the second pole piece. The gluing mechanism is arranged on the discharging side of the second composite mechanism, and the gluing mechanism is used to glue the head end and / or tail end of the second pole piece to fix the second pole piece and the second diaphragm.

[0021] By adopting the above design, at least one of the head end and the tail end of the second electrode piece in the second composite sheet is glued using the glue structure, so that the head end or the tail end of the second electrode piece can be bonded and fixed to the second diaphragm. This can improve the tightness of the fit between the second electrode piece and the second diaphragm, and ensure that the second composite sheet is not easy to fall apart during the transmission and winding process.

[0022] In some embodiments, the winding device further includes a buffer mechanism disposed between the second composite mechanism and the pressing mechanism, and the buffer mechanism is used to buffer the second composite sheet.

[0023] By adopting the above design and utilizing a cache mechanism to temporarily store the second composite sheet, the negative impact of the cutting of the second pole piece on the feeding of the winding device can be reduced. In actual operation, the cache mechanism can also adjust the cache length of the second composite sheet according to the operating conditions of the winding mechanism to achieve continuous feeding, thereby reducing the occurrence of deceleration or shutdown of the winding device, thereby improving the production efficiency of the winding device.

[0024] In some embodiments, the winding device further comprises a third cutting device, which is disposed adjacent to the winding mechanism and is used to cut off the superimposed sheets, and the third cutting device comprises a cam cutter.

[0025] By adopting the above design and using the cam cutter to cut off the overlapped sheets, the occurrence of deceleration or shutdown of the winding device can be reduced, thereby facilitating improving the production efficiency of the winding device.

[0026] In some embodiments, the glue applying mechanism includes two glue applying members disposed at intervals, and the two glue applying members are respectively used to apply glue on edges of two opposite sides of the first surface.

[0027] With the above design, both side edges of the first diaphragm and the second diaphragm can be fixed by gluing the edge sealing area, which can further improve the edge fixing effect of the first diaphragm and the second diaphragm and the connection reliability between the various layer structures.

[0028] In some embodiments, the glue coating mechanism further includes a mounting rod, and the two glue coating members are disposed on the mounting rod, and the distance between the two glue coating members is adjustable.

[0029] With the above design, the distance between the two glue coating parts is adjustable, so that the glue coating mechanism can be suitable for first diaphragms of different sizes and meet various glue coating requirements, thereby effectively improving the versatility of the glue coating mechanism and the winding equipment.

[0030] In some embodiments, the glue coating member is rotatably mounted on the mounting rod, and the glue coating mechanism further includes a driving member, which is used to drive the glue coating member to rotate around the mounting rod so that the glue coating member approaches or moves away from the first surface.

[0031] With the above design, the position of the glue coating member can be flexibly designed. In practical applications, by adjusting the distance between the glue coating member and the first surface, various glue coating requirements can be met, and the glue coating effect can be improved.

[0032] In some embodiments, the glue coating member has a coating head, and the diameter of the coating head is d1, 0.5 mm≤d1≤1 mm.

[0033] By adopting the above design and reasonably limiting the size of the coating head, the requirements of gluing accuracy and gluing efficiency can be balanced.

[0034] An embodiment of the second aspect of the present application provides a winding method, including: providing a first diaphragm, a first electrode sheet, a second diaphragm and a second electrode sheet, the first diaphragm having a first surface; applying glue on the edge of at least one side of the first surface to form a sealing edge area on the first surface; pressing the first diaphragm, the first electrode sheet, the second diaphragm and the second electrode sheet to form a stacked sheet body, and bonding the sealing edge area to the second diaphragm; winding the stacked sheet body to form an electrode assembly.

[0035] In the above embodiment, before the winding step, a gluing step and a pressing step are also included, wherein the gluing step includes gluing the edge of at least one side of the first surface to form a sealing edge area, and the pressing step includes pressing the first diaphragm, the first pole piece, the second diaphragm and the second pole piece to form a stacked sheet body, so that the sealing edge area of ​​the first diaphragm is bonded to the second diaphragm. In this way, by bonding and fixing at least one side of the first diaphragm and the second diaphragm, the fitting stability of the first diaphragm and the second diaphragm can be improved, so that the positions of the first diaphragm and the second diaphragm can be kept relatively stable during the winding process, effectively reducing the risk of displacement of the first diaphragm and the second diaphragm or folding of the diaphragm edge due to lack of fixation. At the same time, when using a vacuum winding needle or other device for auxiliary winding, the vacuum winding needle can adsorb the entire stacked sheet body to avoid the problem of only adsorbing the inner diaphragm and the outer diaphragm folding or slipping due to insufficient adsorption force. The above-mentioned winding method can be used to manufacture electrode assemblies, and can solve the problem of folding and displacement of the diaphragm during the manufacturing process, effectively improving the product quality and product yield of the electrode assembly, and improving the reliability of the electrode assembly and related battery devices.

[0036] In some embodiments, applying glue to the edge of at least one side of the first surface includes: applying glue to the edges of two opposite sides of the first surface to form two edge-sealed areas on the first surface.

[0037] By adopting the above design, edge sealing areas can be formed on both sides of the first surface. After subsequent pressing treatment, the two side edges of the first diaphragm and the second diaphragm are bonded and fixed. This can further improve the edge fixing effect of the first diaphragm and the second diaphragm and the connection reliability between each layer structure, thereby ensuring that the diaphragm is not easily displaced during the winding process and that both side edges will not fold.

[0038] In some embodiments, the first pole piece includes a first pole ear, and applying glue on the edge of at least one side of the first surface includes: intermittently applying glue on the edge of the first surface for bonding to one side of the first pole ear to form an edge sealing area with a space-avoiding position.

[0039] By adopting the above design, by reserving a space to avoid, it is possible to avoid the glue from adhering to the first pole ear, thereby preventing the glue from contaminating or interfering with the first pole ear, ensuring that the first pole ear can maintain a good electrical effect.

[0040] In some embodiments, along the length direction of the first diaphragm, the length of the first electrode tab is l1, the length of the clearance position is l2, and l1+6.5mm≤l2≤l1+10.5mm.

[0041] By adopting the above design, by making the size of the avoidance larger than the size of the first pole ear, a tolerance space can be provided to accept the assembly error between the first diaphragm and the first pole piece, thereby further reducing the risk of glue bonding to the first pole ear. At the same time, the size of the avoidance is reasonably designed, which can not only provide a reliable safety margin, but also avoid the avoidance being designed too large to affect the bonding effect between the first pole piece and the first diaphragm.

[0042] In some embodiments, along the width direction of the first diaphragm, the width of the edge sealing area is w, and 0.1 mm≤w≤0.3 mm.

[0043] With the above design, the edge sealing area has a reasonable size and can provide sufficient bonding area in the width direction to fix the first diaphragm and the second diaphragm, while also avoiding unnecessary material waste caused by the edge sealing area occupying too much space.

[0044] In some embodiments, the first pole piece includes a first main body, the first surface has a patch area for bonding to the first main body, and along the width direction of the first diaphragm, the distance between the edge sealing area and the patch area is d2, 1.75mm≤d2≤2.25mm.

[0045] By adopting the above design, by setting the edge sealing area and the patch area apart, a tolerance space can be provided to accept the assembly error between the first diaphragm and the first pole piece, thereby avoiding the glue in the edge sealing area from adhering to the first main body of the first pole piece. At the same time, the spacing between the edge sealing area and the patch area is reasonably designed, which can not only provide a reliable safety margin, but also avoid unnecessary waste of space and material due to excessive spacing between the two.

[0046] In some embodiments, before pressing the first diaphragm, the first pole piece, the second diaphragm and the second pole piece, the winding method further includes: pressing the first diaphragm and the first pole piece to form a first composite sheet body.

[0047] By adopting the above design, the first pole piece and the first diaphragm are pre-pressed to ensure the alignment accuracy between the two. At the same time, the first composite sheet formed by pressing the first pole piece and the first diaphragm has higher mechanical strength, which is also beneficial to reduce the risk of displacement or folding of the first pole piece and the first diaphragm during the subsequent pressing process of the overlapping sheets. In some embodiments, before pressing the first diaphragm and the first pole piece to form the first composite sheet body, the winding method further includes: cutting the first pole piece by using a cam cutter.

[0048] By adopting the above design, the cam cutter can periodically perform cutting actions during the transmission of the first pole piece, and the cutting cycle can be set according to the preset length of the first pole piece and the transmission line speed. By using the cam cutter to cut off the first pole piece, the occurrence of deceleration or shutdown of the winding equipment can be reduced, which is beneficial to improving the production efficiency of the electrode assembly.

[0049] In some embodiments, after cutting the first pole piece by using a cam cutter, the winding method further includes: transporting the first pole piece by using a vacuum adsorption conveyor belt.

[0050] With the above design, the first pole piece can be stably adsorbed and transported using a vacuum adsorption conveyor belt. During the transportation process, the first pole piece is not prone to warping, shifting or slipping, and will not cause pressure loss to the first pole piece, thereby increasing reliability.

[0051] In some embodiments, before pressing the first diaphragm, the first pole piece, the second diaphragm and the second pole piece, the winding method further includes: pressing the second diaphragm and the second pole piece to form a second composite sheet.

[0052] By adopting the above design, the second pole piece and the second diaphragm are pre-pressed to ensure the alignment accuracy between the two. At the same time, the second composite sheet formed by pressing the second pole piece and the second diaphragm has higher mechanical strength, which is also beneficial to reduce the risk of displacement or folding of the second pole piece and the second diaphragm during the subsequent pressing process of the overlapping sheets.

[0053] In some embodiments, before laminating the second diaphragm and the second pole piece to form the second composite sheet, the winding method further includes: cutting the second pole piece with a cutter; and after laminating the second diaphragm and the second pole piece to form the second composite sheet, the winding method further includes: applying glue to the leading end and / or the trailing end of the second composite sheet to fix the second pole piece and the second diaphragm.

[0054] By adopting the above design, by sticking glue on at least one of the head end and the tail end of the second pole piece, the head end or the tail end of the second pole piece is bonded and fixed to the second diaphragm, which can effectively improve the tightness of the fit between the second pole piece and the second diaphragm, thereby ensuring that the second composite sheet is not easy to fall apart and the second pole piece and the second diaphragm are not easy to slip.

[0055] In some embodiments, after the second diaphragm and the second pole piece are pressed together to form the second composite sheet, the winding method further includes: buffering the second composite sheet.

[0056] By adopting the above design, the negative impact of the second electrode sheet cutting step on the feeding can be reduced through temporary storage of the second composite sheet. In actual production, the buffer length of the second composite sheet can be adjusted according to the winding conditions of the overlapping sheets to achieve continuous feeding, thereby reducing the deceleration or shutdown of the winding equipment during processing, which is beneficial to improving the production efficiency of the electrode assembly.

[0057] In some embodiments, winding the laminated sheets to form the electrode assembly includes: winding the laminated sheets using a vacuum winding needle.

[0058] With the above design, the vacuum winding needle can absorb the overlapping sheets through negative pressure without the need for additional clamping devices. The winding process is highly stable and not prone to damage the pole pieces and diaphragms, which is beneficial to improving the product quality of the electrode assembly.

[0059] In some embodiments, after winding the overlapping sheets, the winding method further comprises: cutting the overlapping sheets with a cam cutter.

[0060] By adopting the above design, the cam cutter is used to cut the first diaphragm and the second diaphragm, which can reduce the occurrence of deceleration or shutdown of the winding equipment, thereby facilitating improving the manufacturing efficiency of the electrode assembly.

[0061] An embodiment of the third aspect of the present application provides a battery manufacturing device, including the winding device in the first aspect.

[0062] The battery manufacturing equipment provided in the embodiment of the present application can effectively improve the product quality and product yield of the electrode assembly by adopting the winding equipment in the first aspect, thereby improving the reliability and safety of the battery device.

[0063] 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

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0065] Figure 1is a schematic structural diagram of a winding device provided in an embodiment of the present application; Figure 2 is a schematic structural diagram of a first composite sheet provided in an embodiment of the present application; Figure 3 It is a structural schematic diagram of the glue coating device provided in the embodiment of the present application; Figure 4 is a structural schematic diagram of the glue coating device provided in an embodiment of the present application from another perspective; Figure 5 is a flow chart of a winding method provided by an embodiment of the present application; Figure 6 This is a flow chart of a winding method provided in another embodiment of the present application.

[0066] The meanings of the marks in the figure are: 100. Winding equipment; 10. Unwinding mechanism; 11. First unwinding roller; 12. Second unwinding roller; 13. Third unwinding roller; 14. Fourth unwinding roller; 20. Glue coating mechanism; 21. Glue coating member; 21a. Coating head; 22. Mounting rod; 23. Driving member; 30. Pressing mechanism; 40. Winding mechanism; 51. First composite mechanism; 52. Second composite mechanism; 61. first cutting device; 62. abutting member; 63. conveying member; 71. second cutting device; 72. gluing mechanism; 73. buffer mechanism; 731. fixed roller; 732. floating roller; 80. A third cutting device; 90. Roller passing; 210, first diaphragm; 211, edge sealing area; 212, avoidance position; 220, first pole piece; 221, first main body; 222, first pole ear; 230, second diaphragm; 240, second pole piece; 250, laminated sheet; 260, first composite sheet; 270, second composite sheet. DETAILED DESCRIPTION

[0067] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0069] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0070] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0071] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0072] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0073] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0074] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0075] The electrode assembly is the core part of the battery cell. In the production process of wound batteries, winding equipment is needed to wind the electrode sheets and separators to form the electrode assembly. At present, in the commonly used winding equipment and winding methods, the cathode sheet, the anode sheet and the two layers of separators can be fed separately, and then stacked in a certain order and transferred to the winding mechanism for winding.

[0076] In the electrode assembly, in order to reliably isolate the two pole pieces, the size of the diaphragm is generally larger than the size of the pole pieces, so that the edges of the diaphragm can extend beyond the pole pieces. However, due to the soft structure of the diaphragm itself and the lack of a reliable fixing structure at the edges of the two layers of diaphragms, the diaphragm is prone to edge folding and displacement during the winding process. In addition, since the pole piece and the diaphragm and the contact surfaces of the two layers of diaphragms are usually only attached together by their own tension, the reliability of this combination is relatively low. During the winding process, especially when using a vacuum winding needle or other device for auxiliary winding, it is often only possible to effectively adsorb the inner diaphragm, while the outer diaphragm is prone to folding or slipping due to insufficient adsorption force.

[0077] Based on the above problems, an embodiment of the present application provides a winding device, including an unwinding mechanism, a gluing mechanism, a pressing mechanism and a winding mechanism, wherein the gluing mechanism is used to apply glue on the edge of the first surface of the first diaphragm to form a sealing area on the first surface, and the pressing mechanism is used to press the first diaphragm, the first pole piece, the second diaphragm and the second pole piece to form a stacked sheet body, and bond the sealing area on the first diaphragm to the second diaphragm. In this way, since the edges of the first diaphragm and the second diaphragm can be bonded and fixed, the positions of the two diaphragms can remain relatively stable during the winding process, the diaphragms are not easy to shift and the edges of the diaphragms are not easy to fold. When using a vacuum winding needle or other device to assist in winding, the vacuum winding needle can simultaneously adsorb the entire stacked sheet body, thereby avoiding the problem of only adsorbing the inner diaphragm and causing the outer diaphragm to fold or slip due to insufficient adsorption force.

[0078] The winding device provided in the embodiment of the present application can be wound to form a cylindrical electrode assembly, or it can be wound to form a prismatic electrode assembly or an electrode assembly of other shapes. The electrode assembly formed by the winding device can be used as a component for electrochemical reaction in a battery cell, and the battery cell can be used in an electrical device using a battery as a power source or various energy storage systems using a battery as an energy storage element. The electrical device can 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, the electric toy can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, electric airplane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, spacecrafts, and the like.

[0079] In order to illustrate the technical solution provided by the present application, the following is a detailed description in conjunction with specific drawings and embodiments. In the embodiments provided by the present application, the direction indicated by X is the width direction of the first diaphragm, and the direction indicated by Y is the length direction of the first diaphragm, and the X direction and the Y direction are perpendicular.

[0080] An embodiment of the first aspect of the present application provides a winding device 100 for manufacturing an electrode assembly.

[0081] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the winding device 100 provided in an embodiment of the present application. Figure 2 The structural schematic diagram of the first diaphragm 210 and the first pole piece 220 provided in the embodiment of the present application, the winding device 100 provided in the embodiment of the present application includes an unwinding mechanism 10, a gluing mechanism 20, a pressing mechanism 30 and a winding mechanism 40. The unwinding mechanism 10 is used to unwind the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240, wherein the first diaphragm 210 has a first surface. The gluing mechanism 20 is arranged on the discharge side of the unwinding mechanism 10, and the gluing mechanism 20 is used to apply glue on the edge of at least one side of the first surface to form a sealing edge area 211 on the first surface. The pressing mechanism 30 is arranged on the discharge side of the gluing mechanism 20, and the pressing mechanism 30 is used to press the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240 to form a laminated sheet 250, and to bond the sealing edge area 211 to the second diaphragm 230. The winding mechanism 40 is disposed at the discharge side of the pressing mechanism 30 , and is used to wind the laminated sheet 250 to form an electrode assembly.

[0082] The unwinding mechanism 10 refers to a structure in the winding device 100 for providing pole pieces and diaphragms. The unwinding mechanism 10 may include a plurality of unwinding members, which are respectively used to unwind the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240. The unwinding members may be, but are not limited to, rollers, reels, rotating shafts and other structures. The unwinding mechanism 10 may include a passive structure, that is, the unwinding mechanism 10 needs to pull the pole piece and the diaphragm through other structures in the winding device 100 to achieve unwinding and feeding. The unwinding mechanism 10 may also include an active structure, for example, a motor and other structures may be used to control the unwinding and feeding of the pole piece and the diaphragm. During the use of the unwinding mechanism 10, parameters such as the unwinding speed and tension need to be precisely controlled to ensure the stability and flatness of the diaphragm and pole piece transportation.

[0083] The glue coating mechanism 20 refers to a structure in the winding device 100 for coating glue on the first diaphragm 210. The glue coating mechanism 20 is located on the discharge side of the unwinding mechanism 10. Specifically, the glue coating mechanism 20 is located in the area through which the first diaphragm 210 passes after being output from the unwinding mechanism 10. The glue coating mechanism 20 may include one or more glue coating members 21, and the glue coating members 21 directly contact the first surface of the first diaphragm 210, so as to coat the glue on the first surface. Along the width direction X of the first diaphragm 210, the first surface includes two opposite sides. The glue coating mechanism 20 can be used to coat glue on the edge of one side of the first surface or on the edges of both sides of the first surface at the same time. The edge sealing area 211 refers to the portion coated with glue within the first surface. The gluing action is carried out synchronously with the conveying of the first diaphragm 210, so the gluing path extends along the length direction Y of the first diaphragm 210. The gluing mechanism 20 can be set to continuous gluing. Continuous gluing means that the gluing mechanism 20 applies glue uninterruptedly along the side of the first surface to form a continuous glue line, that is, a continuous edge sealing area 211. The gluing mechanism 20 can also be set to intermittent gluing. Intermittent gluing means intermittent gluing along the side of the first surface according to a certain interval pattern to form spaced point-like or line-like glue segments.

[0084] The pressing mechanism 30 refers to a structure in the winding device 100 for laminating the pole piece and the diaphragm. The pressing mechanism 30 is located at the discharge side of the glue coating mechanism 20. Specifically, the pressing mechanism 30 is located after the first diaphragm 210 is output from the glue coating mechanism 20, and the area through which the first pole piece 220, the first diaphragm 210 and the second pole piece 240 pass after being output from the unwinding mechanism 10. The pressing mechanism 30 can at least press the edge sealing area 211, and after pressing, the interlayer gap of the contact surface of the first diaphragm 210 and the second diaphragm 230 is less than 0.15mm, thereby ensuring that the sides of the first diaphragm 210 and the second diaphragm 230 can be bonded and fixed. For example, the pressing mechanism 30 may include a pressing roller for applying pressure to the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240, so that the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240 are tightly fitted under the action of tension.

[0085] The first pole piece 220 and the second pole piece 240 have opposite polarities, one of the first pole piece 220 and the second pole piece 240 is a cathode piece, and the other is an anode piece. In the laminated sheet 250, the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240 are stacked in sequence, and the first diaphragm 210 and the second diaphragm 230 are distributed on opposite sides of the first pole piece 220. In the width direction X, the two sides of the first diaphragm 210 and the second diaphragm 230 are in direct contact, and at the edge sealing area 211, the first diaphragm 210 and the second diaphragm 230 are bonded by glue.

[0086] The winding mechanism 40 refers to a structure for winding the pole piece and the separator in the winding device 100. The winding mechanism 40 is located at the discharge side of the pressing mechanism 30. Specifically, the winding mechanism 40 is located in the area where the laminated sheet 250 passes after being output from the pressing mechanism 30. The winding mechanism 40 may include a winding needle for winding the laminated sheet 250, and may also include a holding component, a gluing component, a blanking component, etc. for finishing processing.

[0087] The winding device 100 may also include a frame and a roller 90. The frame is used to provide an installation environment for the unwinding mechanism 10, the gluing mechanism 20, the laminating mechanism 30, the winding mechanism 40 and the conveying device. The roller 90 is arranged between multiple devices and is used to assist in conveying the pole piece and the diaphragm.

[0088] In the winding device 100 provided in the embodiment of the present application, a glue coating mechanism 20 and a pressing mechanism 30 are sequentially provided on the discharge side of the unwinding mechanism 10. The glue coating mechanism 20 can coat the first surface of the first diaphragm 210 with glue, and form a sealing edge area 211 on the edge of at least one side of the first surface. The pressing mechanism 30 can press the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240 to form a stacked sheet 250, and bond the sealing edge area 211 of the first diaphragm 210 to the second diaphragm 230. In this way, in the stacked sheet 250 transmitted to the winding mechanism 40, the edges of at least one side of the first diaphragm 210 and the second diaphragm 230 are bonded and fixed, which makes the first diaphragm 210 and the second diaphragm 230 in the winding process. The position can be kept relatively stable, thereby effectively reducing the risk of displacement of the first diaphragm 210 and the second diaphragm 230 or folding of the diaphragm edges due to lack of fixation. At the same time, since the layers of material in the laminated sheet 250 are closely combined, when auxiliary winding is performed using a vacuum winding needle or the like, the vacuum winding needle can adsorb the entire laminated sheet 250, thereby avoiding the problem of only adsorbing the inner diaphragm and causing folding or slipping of the outer diaphragm due to insufficient adsorption force. In summary, the above-mentioned winding device 100 can be used to manufacture electrode assemblies, and can solve the problem of folding and displacement of the diaphragm during the manufacturing process, effectively improving the product quality and product yield of the electrode assembly, and thereby improving the reliability of the electrode assembly and related battery devices.

[0089] See also Figure 3 and Figure 4 , Figure 3 and Figure 4 A structural schematic diagram of a gluing mechanism 20 provided in an embodiment of the present application. In some embodiments, the gluing mechanism 20 includes two glue coating members 21 spaced apart from each other. The two glue coating members 21 are respectively used to apply glue on the edges of opposite sides of the first surface to form edge sealing areas on both sides of the first surface.

[0090] The glue coating member 21 is a structure in the glue coating mechanism 20 for contacting the first diaphragm 210 and performing glue coating. The glue coating member 21 may include a coating head 21a, a glue supply system, etc. It should be noted that the two glue coating members 21 may work synchronously and perform glue coating independently. The glue coating position and glue coating amount of the glue coating member 21 are determined according to the structure of the diaphragm and the electrode.

[0091] In the above design, two glue coating parts 21 are used to apply glue to the two side edges of the first diaphragm 210 and form a sealing edge area 211. After the subsequent pressing process, the two side edges of the first diaphragm 210 and the second diaphragm 230 can be bonded and fixed. This can further improve the edge fixing effect of the first diaphragm 210 and the second diaphragm 230 and the connection reliability between each layer structure, thereby ensuring that the two side edges of the diaphragm will not be folded during the winding process, and further reducing the risk of diaphragm displacement.

[0092] In addition, in some cases, the first pole piece 220 is an anode piece, and the second pole piece 240 is a cathode piece. During long-term use of the anode piece, lithium deposition may occur, resulting in lithium ions being deposited on the surface of the first pole piece 220. By bonding and fixing the two sides of the first diaphragm 210 and the second diaphragm 230, a relatively sealed environment can be created for the first pole piece 220, thereby reducing the contact between the lithium ions on the surface of the first pole piece 220 and the external air, moisture or other impurities, which is also conducive to improving the safety of the electrode assembly.

[0093] It can be understood that the gluing position of the gluing mechanism 20 is not unique. For example, in some other embodiments, the second diaphragm 230 includes a second surface opposite to the first diaphragm 210, and the gluing mechanism 20 includes two gluing members 21. The two gluing members 21 are respectively arranged on the discharge side of the unwinding device of the first diaphragm 210 and the second diaphragm 230. One of the other gluing members 21 is used to glue the edge of one side of the first surface, and the other is used to glue the edge of one side of the second surface. The edge sealing area 211 of the first surface and the edge sealing area 211 of the second surface are formed on different sides of the overlapping sheet 250. For example, in some other embodiments, the gluing mechanism 20 can also include only one gluing member 21, and the gluing member 21 is used to glue one of the side edges of the first surface.

[0094] See also Figure 3 and Figure 4 In some embodiments, the glue coating mechanism 20 further includes a mounting rod 22, two glue coating members 21 are disposed on the mounting rod 22, and the distance between the two glue coating members 21 is adjustable.

[0095] The mounting rod 22 has a certain length and rigidity, and can reliably support and fix the glue-coated member 21. Optionally, in some embodiments, the mounting position of the glue-coated member 21 on the mounting rod 22 can be adjusted to adjust the distance between the two glue-coated members 21; or, in some embodiments, the mounting rod 22 can be designed as a telescopic rod, and the distance between the two glue-coated members 21 can be adjusted by adjusting the length of the mounting rod 22.

[0096] The gluing mechanism 20 may be provided with an independent fixing frame, or the mounting rod 22 of the gluing mechanism 20 may be directly mounted on the frame of the gluing device.

[0097] In the above design, the distance between the two glue coating members 21 is adjustable, so that the glue coating mechanism 20 can be applied to first diaphragms 210 of different sizes and meet various glue coating requirements, so that the glue coating mechanism 20 and the winding device 100 have high versatility.

[0098] It is understandable that the fixing method of the glue coating member 21 is not unique. In some other embodiments, a robotic arm may be configured to install the glue coating member 21 .

[0099] In some embodiments, the distance between the two glue coating members 21 is 35 mm to 45 mm. For example, the distance between the two glue coating members 21 can be 35 mm, 40 mm, or 45 mm.

[0100] When two glue coating members 21 are used to coat glue on the edges of both sides of the first surface, it is necessary to ensure that the distance between the two glue coating members 21 matches the specification size of the first diaphragm 210, so as to ensure that the glue coating members 21 can perform glue coating operations at preset positions.

[0101] In the above design, the spacing between the glue coating members 21 is reasonably set, which can meet the glue coating requirements of conventional size diaphragms and avoid unnecessary cost increase caused by overly large adjustment range of the glue coating members 21.

[0102] It is understandable that the distance between the two rubber coating parts 21 is designed based on the actual size of the first diaphragm 210. In some other embodiments, if the width of the first diaphragm 210 is larger, the distance between the two rubber coating parts 21 can be 50mm, 55mm, 60mm, or even larger.

[0103] Please refer to Figure 3 and Figure 4 In some embodiments, the glue coating member 21 is rotatably mounted on the mounting rod 22, and the glue coating mechanism 20 further includes a driving member 23, which is used to drive the glue coating member 21 to rotate around the mounting rod 22 so that the glue coating member 21 is close to or away from the first surface.

[0104] For example, the glue coating member 21 can be sleeved on the mounting rod 22 through a bearing or other structure, and the driving member 23 can be a rotary motor, which is independently connected to the glue coating member 21 and can drive any glue coating member 21 to rotate independently with the mounting rod 22 as the axis. It can be understood that the driving member 23 is not limited to a rotary motor. In some other embodiments, the driving member 23 can also be a screw rod, a handle or other structures.

[0105] Since the glue coating member 21 is at least partially fixed on the mounting rod 22, the glue coating member 21 approaching or moving away from the first surface actually means that the coating head 21a of the glue coating member 21 approaches or moves away from the first surface.

[0106] With the above design, on the one hand, the position design of the glue coating member 21 is flexible. In actual application, by adjusting the distance between the glue coating member 21 and the first surface, various glue coating requirements can be met, and the glue coating effect can be improved, wherein the glue coating effect includes glue coating thickness, glue coating uniformity, etc.; on the other hand, by keeping the glue coating member 21 away from the first surface, intermittent glue coating can also be achieved. When the equipment is shut down, the high temperature of the glue coating member 21 can be avoided to burn the first diaphragm 210; in addition, in some cases, the driving member 23 is a rotating motor, and the rotating motor can automatically adjust the position of the glue coating member 21 during the operation of the equipment, which can reduce the occurrence of deceleration or shutdown of the winding device 100, thereby helping to improve the production efficiency of the winding device 100.

[0107] In some embodiments, the distance between the glue coating member 21 and the first surface is controlled to be 0 mm-15 mm.

[0108] The distance between the glue coating member 21 and the first surface actually refers to the distance between the coating head 21a of the glue coating member 21 and the first surface. When the glue coating member 21 is normally coating, the distance between the coating head 21a and the first surface can be 0mm. When the equipment is temporarily stopped, the glue coating member 21 is lifted, and the distance between the coating head 21a and the first surface can be 15mm.

[0109] According to different settings of the glue coating member 21, there are different ways to adjust the distance between the glue coating member 21 and the first diaphragm 210. For example, the glue coating member 21 can be rotatably mounted on the mounting rod 22 through a bearing, and the angle of the glue coating member 21 on the mounting rod 22 can be adjusted by the driving member 23, thereby adjusting the distance between the coating head 21a and the first surface; for another example, the glue coating member 21 can also be installed on a mechanical arm, and the movement of the mechanical arm can be adjusted to adjust the distance between the coating head 21a and the first surface; or, the glue coating member 21 can also be installed on a telescopic rod, and the length of the telescopic rod can be adjusted to adjust the distance between the coating head 21a and the first surface.

[0110] Please refer to Figure 4 In some embodiments, the glue coating member 21 has a coating head 21 a , and the diameter of the coating head 21 a is d1 , 0.5 mm ≤ d1 ≤ 1 mm.

[0111] For example, the coating head 21a may be, but is not limited to, a spray coating head, a blade coating head, a slit coating head, and the like.

[0112] The size of the coating head 21a will affect the glue coating width, glue coating accuracy, glue coating efficiency, etc. It can be understood that the glue coating accuracy is inversely proportional to the size of the coating head 21a. The smaller the size of the coating head 21a, the easier it is to control the glue coating amount, so the coating accuracy is higher; the glue coating efficiency is proportional to the size of the coating head 21a. The larger the size of the coating head 21a, the more glue is output, and the higher the coating speed and glue coating efficiency. In the above design, the size of the coating head 21a is reasonable, which can balance the requirements of glue coating accuracy and glue coating efficiency.

[0113] In some embodiments, the rubber coating member 21 has a heat preservation function, and the heat preservation range is 45°C-75°C.

[0114] The temperature of the glue-coated part 21 will affect the fluidity, viscosity, curing speed and other properties of the glue. The above design can keep the glue at a suitable working temperature for a long time, reducing the risk of glue clogging the coating head 21a. In addition, maintaining the glue-coated part 21 within a reasonable temperature range can also avoid the negative impact of ambient temperature changes on the glue performance, so that the glue performance remains stable for a long time, which is beneficial to improving the consistency of glue coating.

[0115] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a first composite mechanism 51 disposed between the glue coating mechanism 20 and the pressing mechanism 30 , and the first composite mechanism 51 is used to fit the first diaphragm 210 and the first pole piece 220 together to form a first composite sheet body 260 .

[0116] The first composite mechanism 51 refers to a structure in the winding device 100 that allows the first pole piece 220 to be bonded to the first diaphragm 210. The first composite mechanism 51 can press the first pole piece 220 onto the first diaphragm 210 by applying pressure, or can also make the first pole piece 220 bonded to the first diaphragm 210 by gluing or other means. For example, the first composite mechanism 51 may include pressure rollers arranged opposite to each other, and when the first pole piece 220 and the first diaphragm 210 are transferred between the pressure rollers, the pressure rollers can press the first pole piece 220 and the first diaphragm 210, so that the first pole piece 220 and the first diaphragm 210 are bonded to form a first composite sheet 260.

[0117] The first pole piece 220 includes a first main body 221 and a first pole ear 222 connected to the first main body 221. In the first composite sheet 260, the first main body 221 is completely attached to the first surface of the first diaphragm 210, and the first pole ear 222 protrudes from one side edge of the first diaphragm 210 in the width direction X.

[0118] On the one hand, pre-pressing the first pole piece 220 and the first diaphragm 210 can ensure the alignment accuracy between the two; on the other hand, the first composite sheet 260 formed by pressing the first pole piece 220 and the first diaphragm 210 has higher mechanical strength, which is also beneficial to reduce the risk of displacement or folding of the first pole piece 220 and the first diaphragm 210 during the subsequent pressing process of the stacked sheet 250.

[0119] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a first cutting device 61, which is disposed on the feeding side of the first composite mechanism 51 and is used to cut off the first pole piece 220, and the first cutting device 61 includes a cam cutter.

[0120] The first pole piece 220 is supplied in a continuous coil, so during the manufacturing process, the first pole piece 220 needs to be cut according to a predetermined size in the length direction Y of the first pole piece 220 to prepare an electrode assembly that meets the requirements. The length and specific cutting position of the first pole piece 220 need to be determined according to the design requirements and winding method of the electrode assembly.

[0121] The first cutting device 61 refers to a structure in the winding device 100 for cutting off the first pole piece 220. The first cutting device 61 is located at the feeding side of the first composite mechanism 51, specifically, the first cutting device 61 is located at the area where the first pole piece 220 passes before being fed into the first composite mechanism 51.

[0122] The cam cutter is a common automatic cutting tool that can perform cutting actions periodically. For example, the cam cutter may include a driving device, a cam, a rocker arm, and a cutter, and the driving device drives the cam to rotate, thereby driving the rocker arm to reciprocate, so that the cutter intermittently cuts the first pole piece 220; for another example, the cam cutter may include a driving device, a crank slider mechanism, and a cutter, and the driving device drives the crank slider mechanism to move, thereby driving the cutter to reciprocate, so that the cutter intermittently cuts the first pole piece 220.

[0123] The cycle of the cam cutter performing the cutting action can be designed based on the preset length of the first pole piece 220 and the transmission line speed, wherein the transmission line speed of the first pole piece 220 refers to the transmission line speed of the first pole piece 220 before entering the first cutting device 61.

[0124] It can be understood that after the first pole piece 220 is cut, it forms a first composite sheet 260 with the first diaphragm 210 , and the first diaphragm 210 is a continuous structure, which can carry the cut first pole piece 220 into the subsequent workstation.

[0125] In the above design, on the one hand, in the electrode assembly, the length of the first diaphragm 210 usually needs to be greater than the length of the first electrode piece 220. Cutting off the first electrode piece 220 before the first electrode piece 220 is compounded with the first diaphragm 210 makes the operation less difficult and easy to accurately control the cut length of the first electrode piece 220. On the other hand, the cam cutter can periodically perform cutting actions during the transmission of the first electrode piece 220, and the cutting cycle can be set according to the preset length of the first electrode piece 220 and the transmission line speed. Using the cam cutter to cut the first electrode piece 220 can reduce the occurrence of deceleration or shutdown of the winding device 100, thereby helping to improve the production efficiency of the winding device 100.

[0126] It is understandable that in some other embodiments, the first cutting device 61 may also be a linear cutter that reciprocates along a straight line, a laser cutter, etc.

[0127] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a resisting member 62 , which is arranged opposite to the first cutting device 61 and is used to support the first pole piece 220 , and the first cutting device 61 is used to cut off the first pole piece 220 on the resisting member 62 .

[0128] The abutting member 62 has a smooth supporting surface, and the abutting member 62 may be, but is not limited to, a flat plate structure or a cylindrical structure. The abutting member 62 may be designed as a fixed structure or a rotatable structure, and when the abutting member 62 is rotated, it may assist in conveying the first pole piece 220. The first cutting device 61 is spaced apart from the abutting member 62 to ensure that the first pole piece 220 can pass smoothly between the two; in some cases, the spacing between the first cutting device 61 and the abutting member 62 is adjustable to accommodate first pole pieces 220 of different thicknesses.

[0129] With the above design, the abutting member 62 can provide reliable support for the first pole piece 220 , preventing the first pole piece 220 from being deformed or shifted due to cutting pressure during the cutting process, thereby ensuring that the first cutting device 61 can smoothly cut the first pole piece 220 .

[0130] In some embodiments, the abutting member 62 is a vacuum suction roller.

[0131] The vacuum adsorption roller includes a roller body, and adsorption holes are provided on the surface of the roller body. The roller body is connected to a vacuum pumping device. Under the action of the vacuum pumping device, the adsorption holes can adsorb the first pole piece 220 and fix the first pole piece 220 on the surface of the roller body; the roller body can also be connected to a driving device and rotate under the action of the driving device, thereby driving the first pole piece 220 forward.

[0132] The vacuum adsorption roller fixes the first pole piece 220 by adsorbing it through air pressure, which is not easy to damage the first pole piece 220; in some cases, the vacuum adsorption roller can rotate and drive the first pole piece 220 forward, which can also reduce the wear of the first pole piece 220 when passing through the abutment 62.

[0133] It is understandable that in some other embodiments, the abutting member 62 may also include a conveyor belt, a magnetic adsorption roller, an electrostatic adsorption roller, etc.

[0134] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a conveying member 63 disposed between the first cutting device 61 and the first composite mechanism 51 , and the conveying member 63 is used to convey the first pole piece 220 .

[0135] Specifically, the conveying member 63 is used to convey the first pole piece 220 passing through the first cutting device 61 to the first combining mechanism 51 .

[0136] After the first pole piece 220 is cut off, the head end and the tail end of the first pole piece 220 are not easy to fix. By setting the conveying member 63, the cut first pole piece 220 can be fixed, thereby improving the conveying stability of the first pole piece 220. At the same time, in some cases, the conveying member 63 can also provide conveying power to avoid the problem of loss of conveying power that may occur when the first pole piece 220 is cut off.

[0137] In some embodiments, the conveying member 63 includes a vacuum suction conveyor belt.

[0138] The vacuum adsorption conveyor belt includes a conveyor belt, and adsorption holes are provided on the surface of the conveyor belt. The vacuum adsorption conveyor belt is connected to a vacuum pumping device. Under the action of the vacuum pumping device, the adsorption holes can adsorb the first pole piece 220 and fix the first pole piece 220 on the surface of the conveyor belt; the conveyor belt is also connected to a driving device, and can drive the first pole piece 220 forward during the rotation of the conveyor belt.

[0139] Optionally, in a specific embodiment, the winding device 100 includes a first cutting device 61, a vacuum adsorption roller and a vacuum adsorption conveyor belt. The first cutting device 61 is arranged opposite to the vacuum adsorption roller, and the vacuum adsorption roller is arranged adjacent to the vacuum adsorption conveyor belt. The first pole piece 220 can pass through the vacuum adsorption roller and the vacuum adsorption conveyor belt in sequence, and is cut off by the first cutting device 61 when passing through the first vacuum adsorption roller.

[0140] On the one hand, the contact area between the vacuum adsorption conveyor belt and the first pole piece 220 is relatively large, and the first pole piece 220 can be stably adsorbed and conveyed. The first pole piece 220 is not easy to warp, shift or slip during the conveying process. In addition, since the vacuum adsorption conveyor belt adsorbs the first pole piece 220 through air pressure, no pressure loss will be caused to the first pole piece 220 during the conveying process. On the other hand, in addition to being able to adsorb the first pole piece 220, the vacuum adsorption conveyor belt can also adsorb impurities such as debris and dust, thereby reducing the negative impact that impurities may have on the first pole piece 220 and the processing environment.

[0141] In some embodiments, the conveying speed of the vacuum adsorption conveyor belt matches the winding speed of the winding mechanism 40 .

[0142] The conveying speed of the vacuum adsorption conveyor belt refers to the length of the first pole piece 220 that the vacuum conveyor belt can convey per unit time; the winding speed of the winding mechanism 40 refers to the length of the stacked sheet 250 that the winding mechanism 40 winds per unit time.

[0143] The conveying speed of the vacuum adsorption conveyor belt matches the winding speed of the winding mechanism 40, which can reduce the deceleration or shutdown of the winding device 100 and ensure that the tension of the first pole piece 220 remains in a reasonable range to avoid deformation of the first pole piece 220 due to excessive tension.

[0144] It can be understood that in some other embodiments, the conveying member 63 may also include conveying rollers, clamps, etc.

[0145] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a second composite mechanism 52 disposed on the feeding side of the pressing mechanism 30 , and the second composite mechanism 52 is used to fit the second diaphragm 230 and the second pole piece 240 together to form a second composite sheet body 270 .

[0146] The second composite mechanism 52 refers to a structure in the winding device 100 that allows the second pole piece 240 to be attached to the second diaphragm 230. The second composite mechanism 52 can press the second pole piece 240 onto the second diaphragm 230 by applying pressure, or can also make the second pole piece 240 attached to the second diaphragm 230 by gluing or other means. For example, the second composite mechanism 52 may include pressing rollers arranged opposite to each other, and when the second pole piece 240 and the second diaphragm 230 are transferred between the pressing rollers, the pressing rollers can press the second pole piece 240 and the second diaphragm 230, so that the second pole piece 240 and the second diaphragm 230 are attached to form a second composite sheet 270.

[0147] The second pole piece 240 includes a second main body and a second pole ear connected to the second main body. In the second composite sheet 270, the second main body is completely attached to the second surface of the second diaphragm 230, and the second pole ear protrudes from one side edge of the second diaphragm 230 in the width direction X. It can be understood that the subsequent pressing mechanism 30 can directly press the first composite sheet 260 and the second composite sheet 270. In the laminated sheet 250 formed by pressing, the first pole ear 222 and the second pole ear are staggered.

[0148] On the one hand, pre-pressing the second pole piece 240 and the second diaphragm 230 can ensure the alignment accuracy between the two; on the other hand, the second composite sheet 270 formed by pressing the second pole piece 240 and the second diaphragm 230 has higher mechanical strength, which is also beneficial to reduce the risk of displacement or folding of the second pole piece 240 and the second diaphragm 230 during the subsequent pressing process of the stacked sheet 250.

[0149] It is understandable that in some other embodiments, the first diaphragm 210, the first pole piece 220 and the second diaphragm 230 can be firstly bonded to form a composite sheet, and then the third composite sheet and the second pole piece 240 can be pressed together to form a stacked sheet 250; or, the first diaphragm 210 and the first pole piece 220 can be firstly bonded to form a composite sheet, and then the composite sheet, the second diaphragm 230 and the second pole piece 240 can be pressed together to form a stacked sheet 250.

[0150] Please refer to Figure 1 In some embodiments, the winding device 100 also includes a second cutting device 71 and a gluing mechanism 72. The second cutting device 71 is arranged on the feeding side of the second composite mechanism 52, and the second cutting device 71 is used to cut off the second pole piece 240. The gluing mechanism 72 is arranged on the discharging side of the second composite mechanism 52, and the gluing mechanism 72 is used to glue the head end and / or tail end of the second pole piece 240 to fix the second pole piece 240 and the second diaphragm 230.

[0151] The second pole piece 240 is supplied in a continuous coil, so during the manufacturing process, the second pole piece 240 needs to be cut according to a predetermined size in the length direction Y of the second pole piece 240 to prepare an electrode assembly that meets the requirements. The length and specific cutting position of the second pole piece 240 need to be determined according to the design requirements and winding method of the electrode assembly.

[0152] The second cutting device 71 refers to a structure in the winding device 100 for cutting off the second pole piece 240. The second cutting device 71 is located at the feeding side of the second composite mechanism 52. Specifically, the second cutting device 71 is located in the area where the second pole piece 240 passes before being input into the second composite mechanism 52. The second cutting device 71 can be, but is not limited to, a linear cutter, a laser cutter, etc. that reciprocates along a straight line, wherein the linear cutter is used in conjunction with a fixed cutter, and the linear cutter can move in a direction close to or away from the fixed cutter.

[0153] It can be understood that after the second pole piece 240 is cut, it is bonded to the second diaphragm 230 to form the second composite sheet 270 . The second diaphragm 230 is a continuous structure and can carry the cut second pole piece 240 to the subsequent workstation.

[0154] The gluing mechanism 72 refers to a structure in the winding device 100 for gluing the second composite sheet 270. The gluing mechanism 72 is located at the discharge side of the second composite mechanism 52. Specifically, the gluing mechanism 72 is located in the area through which the second composite sheet 270 passes after outputting the second composite mechanism 52. The gluing mechanism 72 may include a gluing roller and a pressure regulating device. The gluing roller is used to glue the second pole piece 240 in the second composite sheet 270. Specifically, it is used to glue a tape, adhesive tape or other fixing structure to at least one of the head end and the tail end of the second pole piece 240 so that the head end and / or the tail end of the second pole piece 240 are bonded and fixed to the second diaphragm 230. The pressure regulating device is used to adjust the pressure of the gluing roller on the second composite sheet 270 to achieve the gluing action and ensure the gluing quality. The gluing mechanism 72 may be designed as a rotatable or movable structure to achieve gluing at different positions of the second pole piece 240.

[0155] In the above design, on the one hand, in the electrode assembly, the length of the second diaphragm 230 usually needs to be greater than the length of the second electrode piece 240. Cutting off the second electrode piece 240 before the second electrode piece 240 is compounded with the second diaphragm 230 makes the operation less difficult and easy to accurately control the cut length of the second electrode piece 240. On the other hand, the gluing structure is used to glue at least one of the head end and the tail end of the second electrode piece 240 in the second composite sheet 270, so that the head end or the tail end of the second electrode piece 240 is bonded and fixed to the second diaphragm 230. This can improve the tightness of the fit between the second electrode piece 240 and the second diaphragm 230, and ensure that the second composite sheet 270 is not easy to spread out during the transmission and winding process. Based on this, the second composite sheet 270 can also achieve long-line transmission.

[0156] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a cache mechanism 73 disposed between the second composite mechanism 52 and the pressing mechanism 30 , and the cache mechanism 73 is used to cache the second composite sheet 270 .

[0157] The buffer mechanism 73 refers to a structure in the winding device 100 for temporarily storing the second composite sheet 270. The buffer mechanism 73 is located between the second composite mechanism 52 and the laminating mechanism 30. Specifically, the buffer mechanism 73 is located in the area after the second composite sheet 270 is output from the second composite mechanism 52 and before the second composite sheet 270 is input into the laminating mechanism 30.

[0158] For example, the buffer mechanism 73 may include a fixed roller 731 and a floating roller 732 arranged at intervals, and the fixed roller 731 and the floating roller 732 can be wound by the second composite sheet 270 to play the role of caching the second composite sheet 270. Further, the fixed roller 731 is fixed in the winding device 100, and the floating roller 732 can approach or move away from the fixed roller 731 in a direction perpendicular to the conveying direction of the second composite sheet 270 to change the length of the second composite sheet 270 cached by the buffer mechanism 73. When the floating roller 732 moves toward the direction approaching the fixed roller 731, the length of the second composite sheet 270 stored in the buffer mechanism 73 decreases, thereby releasing part of the second composite sheet 270; when the floating roller 732 moves toward the direction away from the fixed roller 731, the length of the second composite sheet 270 stored in the buffer mechanism 73 increases, thereby caching a longer second composite sheet 270.

[0159] The fixed roller 731 may be, but is not limited to, a cylindrical roller or a prismatic roller. The material of the fixed roller 731 may be, but is not limited to, plastic, rubber, metal, etc. The fixed roller 731 may be rotatably disposed relative to the frame of the winding device 100, or may be fixedly disposed relative to the frame; the fixed roller 731 may be a passive roller and rotate with the movement of the second composite sheet 270, or may be an active roller and rotate by a drive device such as a motor.

[0160] The floating roller 732 may be, but is not limited to, a cylindrical roller or a prismatic roller. The material of the floating roller 732 may be, but is not limited to, plastic, rubber, metal, etc. The floating roller 732 may be rotatably disposed relative to the frame of the winding device 100, or may be fixedly disposed relative to the frame; the floating roller 732 may be a passive roller and rotate with the movement of the second composite sheet 270, and the fixed roller 731 may also be an active roller and rotate by being driven by a driving device such as a motor.

[0161] In the above design, the cache mechanism 73 is designed to temporarily store the second composite sheet 270, so as to reduce the negative impact of the second pole piece 240 cutting off the feeding of the winding device 100. In actual operation, the cache mechanism 73 can also adjust the cache length of the second composite sheet 270 according to the operation of the winding mechanism 40 to achieve continuous feeding, thereby reducing the occurrence of deceleration or shutdown of the winding device 100, thereby improving the production efficiency of the winding device 100.

[0162] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a third cutting device 80, which is disposed adjacent to the winding mechanism 40 and is used to cut off the overlapping sheet 250, and the third cutting device 80 includes a cam cutter.

[0163] The first separator 210 and the second separator 230 are supplied in the form of continuous coils, so after the winding is completed, the first separator 210 and the second separator 230 need to be cut to prepare an electrode assembly that meets the requirements.

[0164] The third cutting device 80 refers to a structure in the winding device 100 for cutting the first diaphragm 210 and the second diaphragm 230. The third cutting device 80 is disposed adjacent to the winding mechanism 40. Optionally, the cutter of the third cutting device 80 can face the winding mechanism 40 and press against the surface of the laminated sheet 250.

[0165] In the above design, on the one hand, the third cutting device 80 is arranged adjacent to the winding mechanism 40, and the third cutting device 80 can cut off the first diaphragm 210 and the second diaphragm 230 before or after the electrode assembly is rolled, and the operation difficulty is low; on the other hand, the cam cutter can periodically perform cutting action during the winding process of the superimposed sheet 250. Using the cam cutter to cut off the first diaphragm 210 and the second diaphragm 230 can reduce the occurrence of deceleration or shutdown of the winding equipment 100, thereby helping to improve the production efficiency of the winding equipment 100.

[0166] It is understandable that in some other embodiments, one or more cutting devices may be provided between the pressing mechanism 30 and the winding mechanism 40 to cut off the first diaphragm 210 and the second diaphragm 230 synchronously or in steps. The cutting device may be a linear cutter that reciprocates along a straight line, a laser cutter, etc.

[0167] In some embodiments, the winding mechanism 40 includes a vacuum winding needle.

[0168] The vacuum winding needle refers to a structure used for winding the electrode assembly in the winding mechanism 40. The vacuum winding needle may be, but is not limited to, cylindrical, prismatic, etc., wherein a cylindrical vacuum winding needle may be used to form a cylindrical electrode assembly, and a prismatic vacuum winding needle may be used to form a square electrode assembly.

[0169] The vacuum winding needle can absorb the stacked sheet 250 through negative pressure without the need for additional clamping devices. The winding process is highly stable and is not prone to damage the pole piece and the diaphragm.

[0170] In some embodiments, the winding device 100 also includes multiple conveying devices, which may be but are not limited to clamps, rollers 90, etc. The conveying devices can be arranged at any position between the unwinding mechanism 10, the gluing mechanism 20, the pressing mechanism 30, and the winding mechanism 40 to assist in conveying the electrode and the diaphragm.

[0171] In some embodiments, the winding device 100 further includes a finishing mechanism, which is used to perform finishing processing on the wound electrode assembly. For example, the finishing mechanism may include a robot arm, which can be used to remove the electrode assembly from the winding mechanism 40.

[0172] In a specific embodiment provided in this application, please refer to Figure 1 The winding device 100 includes an unwinding mechanism 10, a gluing mechanism 20, a first cutting device 61, a resisting member 62, a conveying member 63, a first composite mechanism 51, a second cutting device 71, a gluing mechanism 72, a second composite mechanism 52, a buffer mechanism 73, a pressing mechanism 30, a winding mechanism 40 and a third cutting device 80.

[0173] The unwinding mechanism 10 includes a first unwinding roller 11, a second unwinding roller 12, a third unwinding roller 13, and a fourth unwinding roller 14 which are arranged at intervals. When the winding device 100 is in an initial state, the first diaphragm 210 is wound on the first unwinding roller 11, the first pole piece 220 is wound on the second unwinding roller 12, the second diaphragm 230 is wound on the third unwinding roller 13, and the second pole piece 240 is wound on the fourth unwinding roller 14. When the winding device 100 is in a working state, the first unwinding roller 11 is used to unwind the first diaphragm 210, the second unwinding roller 12 is used to unwind the first pole piece 220, the third unwinding roller 13 is used to unwind the second diaphragm 230, and the fourth unwinding roller 14 is used to unwind the second pole piece 240. The above-mentioned unwinding rollers can be flexibly arranged. For example, in the height direction of the winding device 100, the first unwinding roller 11, the second unwinding roller 12, the third unwinding roller 13 and the fourth unwinding roller 14 can be arranged from bottom to top, so that the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240 are stacked from bottom to top.

[0174] The glue coating mechanism 20 is arranged on the discharge side of the first unwinding roller 11. The glue coating mechanism 20 may include two glue coating members 21, a mounting rod 22 and a rotating motor. The two glue coating members 21 are sleeved on the mounting rod 22 and arranged at intervals. The two glue coating members 21 are respectively used to apply glue on the two side edges of the first surface of the first diaphragm 210. The rotating motor is connected to the two glue coating members 21, and can drive any glue coating member 21 to rotate independently with the mounting rod 22 as the axis, so as to adjust the distance between the glue coating member 21 and the first surface. The distance between the two glue coating members 21 is 35mm-45mm. For example, the distance between the two glue coating members 21 can be 35mm, 40mm, and 45mm. The glue coating member 21 has a coating head 21a, and the diameter of the coating head 21a is d1, 0.5mm≤d1≤1mm. For example, the diameter of the coating head 21a can be 0.5mm, 0.8mm, and 1mm.

[0175] The first cutting device 61 is disposed at the discharge side of the second unwinding roller 12. The first cutting device 61 is used to cut off the first pole piece 220 output by the second unwinding roller 12. The first cutting device 61 may include a cam cutter.

[0176] The abutment member 62 is disposed on the discharge side of the second unwinding roller 12 and is disposed opposite to the first cutting device 61. The abutment member 62 may be a vacuum adsorption roller, which can adsorb and support the first pole piece 220, thereby preventing the first pole piece 220 from being deformed or displaced due to the cutting pressure during the cutting process. The vacuum adsorption roller may include a roller body, and the surface of the roller body is provided with adsorption holes, which can adsorb the first pole piece 220 and fix the first pole piece 220 on the surface of the roller body; the roller body may also be connected to a driving device, and rotate under the action of the driving device, thereby driving the first pole piece 220 forward.

[0177] The conveyor 63 is arranged on the discharge side of the abutting member 62 and is arranged adjacent to the abutting member 62. The conveyor 63 can be a vacuum adsorption conveyor belt, which can receive the first pole piece 220 output by the abutting member 62 and transfer the first pole piece 220 to a subsequent workstation. The vacuum adsorption conveyor belt can include a conveyor belt, and the surface of the conveyor belt is provided with adsorption holes, which can adsorb the first pole piece 220 and fix the first pole piece 220 on the surface of the conveyor belt; the conveyor belt is also connected to a driving device, and can drive the first pole piece 220 forward during the rotation of the conveyor belt.

[0178] The first composite mechanism 51 is disposed at the discharging side of the glue coating mechanism 20 and the vacuum adsorption conveyor belt. The first composite mechanism 51 may include two pressing rollers arranged opposite to each other. When the first pole piece 220 and the first diaphragm 210 are transferred between the two pressing rollers, the two pressing rollers may press the first pole piece 220 and the first diaphragm 210 together, so that the first pole piece 220 and the first diaphragm 210 are attached to each other to form a first composite sheet 260.

[0179] The second cutting device 71 is disposed on the discharge side of the fourth unwinding roller 14. The second cutting device 71 is used to cut off the second pole piece 240 outputted by the fourth unwinding roller 14.

[0180] The second composite mechanism 52 is disposed on the discharge side of the third unwinding roller 13 and the second cutting device 71. The second composite mechanism 52 may include two pressing rollers arranged opposite to each other. When the second pole piece 240 and the second diaphragm 230 are transferred between the two pressing rollers, the two pressing rollers may press the second pole piece 240 and the second diaphragm 230 together to make the second pole piece 240 and the second diaphragm 230 fit together to form a second composite sheet 270.

[0181] The gluing mechanism 72 is disposed at the discharge side of the second composite mechanism 52. The gluing mechanism 72 may include a gluing roller, which is used to glue the second pole piece 240 in the second composite sheet body 270, specifically, to glue a fixing structure such as a tape or adhesive paper on at least one of the head end and the tail end of the second pole piece 240, so that the head end and / or the tail end of the second pole piece 240 is bonded and fixed to the second diaphragm 230.

[0182] The buffer mechanism 73 is disposed at the discharge side of the gluing mechanism 72. The buffer mechanism 73 may include a fixed roller 731 and a floating roller 732 disposed at intervals, and the fixed roller 731 and the floating roller 732 can be wound around the second composite sheet 270 to play the role of buffering the second composite sheet 270.

[0183] The pressing mechanism 30 is disposed on the discharge side of the first composite mechanism 51 and the buffer mechanism 73. The pressing mechanism 30 may include a pressing roller, which can apply pressure to the first composite sheet 260 and the second composite sheet 270, so that the first composite sheet 260 and the second composite sheet 270 are tightly attached to form a laminated sheet 250 under the action of tension, and the side edges of the first diaphragm 210 and the second diaphragm 230 are bonded and fixed.

[0184] The winding mechanism 40 is disposed at the discharge side of the pressing mechanism 30. The winding mechanism 40 may include a vacuum winding needle, which is used to absorb and wind the stacked sheets 250 to form an electrode assembly. The vacuum winding needle may be, but is not limited to, cylindrical, prismatic, and the like.

[0185] The third cutting device 80 is disposed at the discharge side of the winding mechanism 40. The third cutting device 80 is used to cut the first separator 210 and the second separator 230 to prepare an electrode assembly that meets the requirements. The third cutting device 80 may be a cam cutter.

[0186] In summary, the winding device 100 provided in the embodiment of the present application has the following advantages: 1. By setting up a gluing mechanism 20 and a pressing mechanism 30, it is possible to apply glue on the surface of the first diaphragm 210 and to bond and fix the edges of at least one side of the first diaphragm 210 and the second diaphragm 230. This design can improve the tightness of the fit between the first diaphragm 210 and the second diaphragm 230, and solve the problem that the diaphragm is easily displaced or the edges are easily folded during the winding process, thereby improving the product quality and product yield of the electrode assembly; 2. By setting up a first composite mechanism 51 and a second composite mechanism 52, it is possible to pre-press the first diaphragm 210 and the first electrode piece 220, as well as pre-press the second diaphragm 230 and the second electrode piece 240, which is conducive to improving the alignment accuracy of the diaphragm and the electrode piece, thereby further improving the product quality of the electrode assembly. 3. Using a cam cutter to cut off the first pole piece 220, the first diaphragm 210 and the second diaphragm 230, and using the cache mechanism 73 to cache the second composite sheet 270, the feeding speed of the pole piece and the diaphragm can be matched with the winding speed, reducing the occurrence of deceleration or shutdown during the operation of the winding device 100, thereby improving the production efficiency of the winding device 100.

[0187] An embodiment of the second aspect of the present application provides a winding method for manufacturing an electrode assembly.

[0188] See also Figure 1 and Figure 5 , Figure 5 The specific flow chart of the winding method provided in the embodiment of the present application, the winding method provided in the embodiment of the present application includes: S10 , providing a first diaphragm 210 , a first pole piece 220 , a second diaphragm 230 , and a second pole piece 240 , wherein the first diaphragm 210 has a first surface.

[0189] The first pole piece 220 and the second pole piece 240 are core structures that participate in the electrochemical reaction in the battery device. The first pole piece 220 and the second pole piece 240 have different polarities, one of the first pole piece 220 and the second pole piece 240 is an anode piece, and the other is a cathode piece. The first pole piece 220 and the second pole piece 240 both include a main body and a pole ear connected to the main body, wherein the main body may include a current collector and an active material coated on the surface of the current collector, the main body may be in the shape of a long strip, the size and thickness of the main body are determined according to design requirements, the pole ear is a metal conductor led out from the main body, and the number, size and location of the pole ear are determined according to design requirements.

[0190] The first diaphragm 210 and the second diaphragm 230 are polymer films with a microporous structure, which are used to separate the first electrode 220 and the second electrode 240 in the electrode assembly to prevent the first electrode 220 and the second electrode 240 from directly contacting each other and causing a short circuit. The first diaphragm 210 and the second diaphragm 230 can be in the shape of long strips, and the size and thickness of the first diaphragm 210 and the second diaphragm 230 are determined according to design requirements. The first diaphragm 210 includes two opposite surfaces in its thickness direction, one of which is defined as the first surface, and the first surface is used for the first electrode 220 to be attached; the second diaphragm 230 includes two opposite surfaces in its thickness direction, one of which is defined as the second surface, and the second surface is used to be opposite to the first surface.

[0191] The first separator 210 , the first electrode sheet 220 , the second separator 230 , and the second electrode sheet 240 can be wound in a specific manner to form an electrode assembly.

[0192] S20, applying glue to the edge of at least one side of the first surface to form an edge-sealed area 211 on the first surface.

[0193] The glue coating method includes but is not limited to spraying, scraping, etc. The glue coating can be continuous glue coating, which means that the glue is applied uninterruptedly along the edge of the first surface to form a continuous glue line; the glue coating can also be intermittent glue coating, which means that the glue is applied intermittently along the edge of the first surface according to a certain interval pattern to form spaced point-shaped or line-shaped glue segments.

[0194] The first diaphragm 210 has two opposite sides in the width direction X, wherein the width direction X is perpendicular to the conveying direction of the first diaphragm 210. The above-mentioned "applying glue on at least one side edge of the first surface" includes applying glue on both side edges of the first surface, and applying glue on any side edge. It should be noted that the above-mentioned "one side edge" is not limited to the edge position, but also includes a position close to the side edge.

[0195] The edge sealing area 211 refers to the portion of the first surface where glue is applied.

[0196] S30 , pressing the first diaphragm 210 , the first pole piece 220 , the second diaphragm 230 and the second pole piece 240 together to form a laminated sheet body 250 , and bonding the edge sealing area 211 to the second diaphragm 230 .

[0197] Pressing means stacking the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240 in sequence, and applying pressure to tightly fit the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240 together. Pressing includes pressing the diaphragm and the pole piece as a whole, and may also include pressing the sides of the diaphragm and the pole piece. When pressing the sides of the diaphragm and the pole piece, the pressing area should cover the edge sealing area 211.

[0198] The size of the diaphragm is generally larger than that of the pole piece. After pressing, the two side edges of the first diaphragm 210 and the second diaphragm 230 are in direct contact. At the position where the edge sealing area 211 is formed, the first diaphragm 210 and the second diaphragm 230 can be fixed by glue.

[0199] S40, winding the laminated sheet 250 to form an electrode assembly.

[0200] Winding refers to rolling up the stacked sheet 250 in a certain direction. Different winding mechanisms 40 can be used to form electrode assemblies of different shapes, including but not limited to cylindrical electrode assemblies, prismatic electrode assemblies, and the like.

[0201] Optionally, the first electrode sheet 220 may be an anode sheet, and the second electrode sheet 240 may be a cathode sheet. In the formed electrode assembly, the length of the anode sheet is greater than the length of the cathode sheet, so that the anode sheet can cover the cathode sheet.

[0202] In the winding method provided in the embodiment of the present application, a gluing step and a pressing step are also included before the winding step, wherein the gluing step includes gluing the edge of at least one side of the first surface to form a sealing edge area 211, and the pressing step includes pressing the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240 to form a laminated sheet body 250, so that the sealing edge area 211 of the first diaphragm 210 is bonded to the second diaphragm 230. In this way, by bonding and fixing at least one side of the first diaphragm 210 and the second diaphragm 230, the lamination stability of the first diaphragm 210 and the second diaphragm 230 can be improved. , so that the positions of the first diaphragm 210 and the second diaphragm 230 can remain relatively stable during the winding process, effectively reducing the risk of displacement of the first diaphragm 210 and the second diaphragm 230 or folding of the diaphragm edges due to lack of fixation. At the same time, when using a vacuum winding needle and other devices for auxiliary winding, the vacuum winding needle can adsorb the entire laminated sheet 250, avoiding the problem of only adsorbing the inner diaphragm and causing the outer diaphragm to fold or slip due to insufficient adsorption force. Therefore, the winding method can effectively improve the product quality and product yield of the electrode assembly, thereby producing an electrode assembly and battery device with higher reliability.

[0203] In some embodiments, step S20 includes: applying glue on the edges of two opposite sides of the first surface to form edge-sealing areas 211 on the two sides of the first surface respectively.

[0204] Along the width direction X of the first diaphragm 210 , the two edge sealing areas 211 are arranged at intervals, and the portion between the two edge sealing areas 211 is used to adhere to the first pole piece 220 .

[0205] By adopting the above design, edge sealing areas 211 can be formed on both sides of the first surface. After subsequent pressing treatment, both side edges of the first diaphragm 210 and the second diaphragm 230 are bonded and fixed, which can further improve the edge fixing effect of the first diaphragm 210 and the second diaphragm 230 and the connection reliability between each layer structure, thereby ensuring that the diaphragm is not easily displaced during the winding process and both side edges will not fold.

[0206] In addition, in some cases, the first pole piece 220 is an anode piece, and the second pole piece 240 is a cathode piece. During long-term use of the anode piece, lithium deposition may occur, resulting in lithium ions being deposited on the surface of the first pole piece 220. In the above design, the first diaphragm 210 and the second diaphragm 230 are respectively pressed on opposite sides of the first pole piece 220, and the two sides are bonded and sealed, which can create a relatively sealed environment for the first pole piece 220, thereby reducing the contact between the lithium ions on the surface of the first pole piece 220 and the external air, moisture or other impurities, which is also conducive to enhancing the safety of the electrode assembly.

[0207] It can be understood that in some other embodiments, the second diaphragm 230 includes a second surface, and before the diaphragm and the electrode are pressed together, glue can be applied to the second surface to form a sealing edge area 211, thereby achieving bonding and fixation of the sides of the first diaphragm 210 and the second diaphragm 230; when applying glue to the second surface, the glue application position can be the edge of one side or the edges of both sides of the second surface, and the sealing edge area 211 formed on the second surface can be relative to or staggered with the sealing edge area 211 formed on the first surface.

[0208] Please refer to Figure 2 and Figure 6 In some embodiments, the first pole piece 220 includes a first pole ear 222 , and step S20 includes: intermittently applying glue on the edge of the first surface for bonding to one side of the first pole ear 222 to form an edge sealing area 211 with a clearance 212 .

[0209] The first pole piece 220 includes a first main body 221 and a first pole ear 222 disposed on one side of the first main body 221. After the first pole piece 220 is attached to the first diaphragm 210, the portion of the first pole ear 222 connected to the first main body 221 is attached to the first surface, and the portion away from the first main body 221 extends out of the first surface. The glue coating position avoids the portion for attaching the first pole ear 222.

[0210] In the above design, by reserving the avoidance space 212 , it is possible to prevent the glue from adhering to the first pole lug 222 , thereby preventing the glue from contaminating or interfering with the first pole lug 222 , and ensuring that the first pole lug 222 can maintain a good electrical effect.

[0211] It is understandable that the second diaphragm 230 is pressed between the first diaphragm 210 and the second pole piece 240 , and the glue on the first diaphragm 210 will not adhere to the second pole piece 240 .

[0212] In some embodiments, along the length direction Y of the first diaphragm 210 , the length of the first electrode tab 222 is l1 , the length of the clearance space 212 is l2 , and l1+6.5 mm≤l2≤l1+10.5 mm.

[0213] The length of the clearance 212 is 6.5 mm-10.5 mm longer than that of the first pole tab 222 . When the first pole tab 222 is located at the center of the clearance 212 , the distance between the edge sealing area 211 and the first pole tab 222 is 3.25 mm-5.25 mm.

[0214] On the one hand, there may be alignment errors during the pressing process of the first diaphragm 210 and the first pole piece 220. By making the size of the avoidance position 212 larger than the size of the first pole piece 222, a tolerance space can be provided to accept these assembly errors, further reducing the risk of glue bonding to the first pole piece 222. On the other hand, the size of the avoidance position 212 is reasonably designed, which can not only provide a reliable safety margin, but also avoid the avoidance position 212 being designed too large to affect the bonding effect between the first pole piece 220 and the first diaphragm 210.

[0215] In some embodiments, along the width direction X of the first diaphragm 210 , the width of the edge sealing area 211 is w, and 0.1 mm≤w≤0.3 mm.

[0216] For example, the width of the edge sealing area 211 may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm.

[0217] The width of the edge sealing area 211 is also the width of the glue coating. The larger the width of the edge sealing area 211, the larger the corresponding amount of glue and the bonding area provided, thereby generating a stronger bonding force.

[0218] In the above design, the edge sealing area 211 has a reasonable size and can provide a sufficient bonding area in the width direction X to fix the first diaphragm 210 and the second diaphragm 230 , while also avoiding the edge sealing area 211 occupying too much space and causing unnecessary material waste.

[0219] It is understandable that in some other embodiments, the width of the edge sealing area 211 can also be designed to be 0.4 mm, 0.5 mm, 0.6 mm, or even a larger size.

[0220] In some embodiments, the first pole piece 220 includes a first main body 221 , and the first surface has a patch area for bonding to the first main body 221 . Along the width direction X of the first diaphragm 210 , the distance between the edge sealing area 211 and the patch area is d2, 1.75mm≤d2≤2.25mm.

[0221] For example, the distance between the edge sealing area 211 and the patch area may be 1.75 mm, 1.85 mm, 2.0 mm, 2.1 mm, or 2.25 mm.

[0222] On the one hand, there may be alignment errors during the pressing process of the first diaphragm 210 and the first pole piece 220. By spacing the edge sealing area 211 and the patch area, a tolerance space can be provided to accept these assembly errors, thereby preventing the glue in the edge sealing area 211 from adhering to the first main body 221 of the first pole piece 220. On the other hand, the spacing between the edge sealing area 211 and the patch area is reasonable, which can not only provide a reliable safety margin, but also avoid unnecessary waste of space and material due to excessive spacing between the two.

[0223] In some embodiments, before step S30 , the winding method further includes: pressing the first diaphragm 210 and the first pole piece 220 to form a first composite sheet 260 .

[0224] Specifically, the first electrode piece 220 includes a first main body 221 and a first electrode ear 222. The first surface of the first diaphragm 210 has a patch area. During pressing, the first diaphragm 210 and the first electrode piece 220 need to be stacked so that the first electrode piece 220 faces the first surface. After the first main body 221 is aligned with the patch area, pressure is applied to the first diaphragm 210 and the first electrode piece 220 so that the first electrode piece 220 is tightly attached to the first diaphragm 210 to form a first composite sheet 260.

[0225] In the first composite sheet 260 , the first electrode tab 222 protrudes from one side edge of the first diaphragm 210 in the width direction X.

[0226] On the one hand, pre-pressing the first pole piece 220 and the first diaphragm 210 can improve the alignment accuracy between the two; on the other hand, the first composite sheet 260 formed by pressing the first pole piece 220 and the first diaphragm 210 has higher mechanical strength, which is also beneficial to reduce the risk of displacement or folding of the first pole piece 220 and the first diaphragm 210 during the subsequent pressing process of the stacked sheet 250.

[0227] In some embodiments, before pressing the first diaphragm 210 and the first pole piece 220 to form the first composite sheet 260 , the winding method further includes: cutting the first pole piece 220 by using a cam cutter.

[0228] The first pole piece 220 is supplied in a continuous coil, so during the manufacturing process, the first pole piece 220 needs to be cut according to a predetermined size in the length direction Y of the first pole piece 220 to prepare an electrode assembly that meets the requirements. The length and specific cutting position of the first pole piece 220 need to be determined according to the design requirements and winding method of the electrode assembly.

[0229] It can be understood that after the first pole piece 220 is cut, it is bonded to the first diaphragm 210 to form the first composite sheet 260 . The first diaphragm 210 is a continuous structure and can carry the first pole piece 220 to enter the subsequent workstation together.

[0230] In the above design, on the one hand, in the electrode assembly, the length of the first diaphragm 210 usually needs to be greater than the length of the first electrode piece 220. Cutting off the first electrode piece 220 before the first electrode piece 220 and the first diaphragm 210 are compounded has lower operation difficulty and is easy to accurately control the cut length of the first electrode piece 220. On the other hand, the cam cutter can periodically perform cutting action during the transmission of the first electrode piece 220, and the cutting cycle can be set according to the preset length of the first electrode piece 220 and the transmission line speed. Using the cam cutter to cut the first electrode piece 220 can reduce the occurrence of deceleration or shutdown of the winding equipment 100, which is beneficial to improving the production efficiency of the electrode assembly.

[0231] It is understandable that in some other embodiments, the first pole piece 220 may be cut by a cutting device such as a linear cutter or a laser cutter that reciprocates along a straight line.

[0232] In some embodiments, after cutting the first pole piece 220 by using a cam cutter, the winding method further includes: transporting the first pole piece 220 by using a vacuum adsorption conveyor belt.

[0233] For example, the vacuum adsorption conveyor belt includes a conveyor belt, the surface of the conveyor belt is provided with adsorption holes, the vacuum adsorption conveyor belt is connected to a vacuum pumping device, under the action of the vacuum pumping device, the adsorption holes can adsorb the first pole piece 220 and fix the first pole piece 220 on the surface of the conveyor belt; the conveyor belt is also connected to a driving device, which can drive the first pole piece 220 forward during the rotation of the conveyor belt.

[0234] On the one hand, after the first pole piece 220 is cut off, the head and tail ends of the first pole piece 220 are not easy to fix. The vacuum adsorption conveyor belt can stably adsorb and convey the first pole piece 220. During the transportation process, the first pole piece 220 is not easy to warp, shift or slip, and will not cause pressure loss to the first pole piece 220, so the reliability is higher. On the other hand, in addition to being able to adsorb the first pole piece 220, the vacuum adsorption conveyor belt can also adsorb impurities such as debris and dust, thereby reducing the negative impact that impurities may have on the first pole piece 220 and the processing environment.

[0235] In some embodiments, the conveying speed of the vacuum adsorption transmission belt matches the winding speed of the winding mechanism 40, so that the winding device 100 can operate without deceleration or stopping.

[0236] The conveying speed of the vacuum adsorption conveyor belt refers to the length of the first pole piece 220 that the vacuum conveyor belt can convey per unit time; the winding speed of the winding mechanism 40 refers to the length of the stacked sheet 250 that the winding mechanism 40 winds per unit time.

[0237] The conveying speed of the vacuum adsorption conveyor belt matches the winding speed of the winding mechanism 40, which can reduce the deceleration or shutdown of the winding device 100 and ensure that the tension of the first pole piece 220 remains within a reasonable range, thereby avoiding deformation of the first pole piece 220 due to excessive tension.

[0238] It is understandable that in some other embodiments, a conveying roller or a clamp conveying device may be used to assist in conveying the first electrode sheet 220. In some embodiments, before step S30, the winding method further includes: pressing the second diaphragm 230 and the second electrode sheet 240 to form a second composite sheet 270.

[0239] Specifically, the second electrode piece 240 includes a second main body and a second electrode ear. The second surface of the second diaphragm 230 has a patch area. During pressing, the second diaphragm 230 and the second electrode piece 240 need to be stacked so that the second electrode piece 240 faces the second surface. After the second main body is aligned with the patch area, pressure is applied to the second diaphragm 230 and the second electrode piece 240 so that the second electrode piece 240 is tightly fitted on the second diaphragm 230 to form a second composite sheet 270.

[0240] In the second composite sheet 270 , the second electrode tab protrudes from one side edge of the second diaphragm 230 in the width direction X.

[0241] On the one hand, pre-pressing the second pole piece 240 and the second diaphragm 230 can ensure the alignment accuracy between the two; on the other hand, the second composite sheet 270 formed by pressing the second pole piece 240 and the second diaphragm 230 has higher mechanical strength, which is also beneficial to reduce the risk of displacement or folding of the second pole piece 240 and the second diaphragm 230 during the subsequent pressing process of the stacked sheet 250.

[0242] In some embodiments, before pressing the second diaphragm 230 and the second pole piece 240 to form the second composite sheet 270, the winding method also includes: cutting the second pole piece 240 with a cutter; and after pressing the second diaphragm 230 and the second pole piece 240 to form the second composite sheet 270, the winding method also includes: applying glue to the front end and / or the rear end of the second composite sheet 270 to fix the second pole piece 240 and the second diaphragm 230.

[0243] The second pole piece 240 is supplied in a continuous coil, so during the manufacturing process, the second pole piece 240 needs to be cut according to a predetermined size in the length direction Y of the second pole piece 240 to prepare an electrode assembly that meets the requirements. The length and specific cutting position of the second pole piece 240 need to be determined according to the design requirements and winding method of the electrode assembly.

[0244] The gluing includes gluing a fixing structure such as a tape or adhesive paper on at least one of the leading end and the trailing end of the second pole piece 240 .

[0245] It can be understood that after the second pole piece 240 is cut, it is bonded to the second diaphragm 230 to form the second composite sheet 270 . The second diaphragm 230 is a continuous structure and can carry the cut second pole piece 240 to the subsequent workstation.

[0246] In the above design, on the one hand, in the electrode assembly, the length of the second diaphragm 230 usually needs to be greater than the length of the second electrode piece 240. Cutting off the second electrode piece 240 before the second electrode piece 240 and the second diaphragm 230 are bonded together makes the operation less difficult and easy to accurately control the cut length of the second electrode piece 240. On the other hand, by gluing at least one of the head end and the tail end of the second electrode piece 240, the head end or the tail end of the second electrode piece 240 is bonded and fixed to the second diaphragm 230, which can effectively improve the tightness of the bonding between the second electrode piece 240 and the second diaphragm 230, and ensure that the second composite sheet 270 is not easy to spread out during the transmission and winding process. Based on this, the second composite sheet 270 can also achieve long-line transportation.

[0247] In some embodiments, after the second diaphragm 230 and the second pole piece 240 are pressed together to form the second composite sheet 270 , the winding method further includes: buffering the second composite sheet 270 .

[0248] Optionally, in a specific embodiment, before laminating the second diaphragm 230 and the second pole piece 240, the winding method includes: cutting the second pole piece 240, and after laminating the second diaphragm 230 and the second pole piece 240, the winding method includes: applying glue to the head end and / or tail end of the second pole piece 240, and caching the second composite sheet 270. Specifically, the second composite sheet 270 can be temporarily stored using a cache structure, such as a fixed roller 731 and a floating roller 732.

[0249] By temporarily storing the second composite sheet 270, the negative impact of the cutting step of the second electrode sheet 240 on the feeding can be reduced. In actual production, the buffer length of the second composite sheet 270 can be adjusted according to the winding condition of the superimposed sheet 250 to achieve continuous feeding, thereby reducing the deceleration or shutdown of the winding equipment 100 during processing, which is beneficial to improving the production efficiency of the electrode assembly.

[0250] In some embodiments, after the first diaphragm 210 , the first pole piece 220 , the second diaphragm 230 , and the second pole piece 240 are pressed together, the interlayer gap between the contact surfaces of the first diaphragm 210 and the second diaphragm 230 is less than 0.15 mm.

[0251] In the above design, by reasonably limiting the interlayer gap between the contact surfaces of the first diaphragm 210 and the second diaphragm 230, the glue in the edge sealing area 211 can fully spread and penetrate between the first diaphragm 210 and the second diaphragm 230, so that the side bonding effect of the first diaphragm 210 and the second diaphragm 230 is good and the combination is tighter.

[0252] In some embodiments, step S40 includes: rolling up the stacked sheet 250 using a vacuum rolling needle.

[0253] The vacuum rolling needle may be, but is not limited to, cylindrical, prismatic, etc., wherein a cylindrical vacuum rolling needle may be used to form a cylindrical electrode assembly, and a prismatic vacuum rolling needle may be used to form a square electrode assembly.

[0254] The vacuum winding needle can absorb the stacked sheets 250 through negative pressure without the need for additional clamping devices. The winding process is highly stable and is not prone to damage the pole pieces and diaphragms, which is beneficial to improving the product quality of the electrode assembly.

[0255] In some embodiments, after winding the superposed sheet 250 , the winding method further includes: cutting the superposed sheet 250 with a cam cutter.

[0256] The first separator 210 and the second separator 230 are supplied in the form of continuous coils, so after the winding is completed, the first separator 210 and the second separator 230 need to be cut to prepare an electrode assembly that meets the requirements.

[0257] The cam cutter can periodically perform cutting actions during the winding process of the laminated sheet 250. By using the cam cutter to cut the first diaphragm 210 and the second diaphragm 230, the occurrence of deceleration or shutdown of the winding device 100 can be reduced, thereby facilitating improving the manufacturing efficiency of the electrode assembly.

[0258] In summary, the winding method provided in the embodiment of the present application has the following advantages: 1. By applying glue on the first surface of the first diaphragm 210, at least one side edge of the first diaphragm 210 and the second diaphragm 230 are bonded and fixed after being pressed together, the tightness of the fit between the first diaphragm 210 and the second diaphragm 230 can be effectively improved, and the problem that the diaphragm is easily displaced or the edge is easily folded during the winding process is solved, thereby improving the product quality and product yield of the electrode assembly; 2. By pre-pressing the first diaphragm 210 and the first electrode piece 220, and pre-pressing the second diaphragm 230 and the second electrode piece 240, the alignment accuracy of the diaphragm and the electrode piece can be improved, thereby further improving the product quality of the electrode assembly; 3. By using a cam cutter to cut off the first electrode piece 220, the first diaphragm 210 and the second diaphragm 230, and caching the second composite sheet 270, the feeding speed of the electrode piece and the diaphragm can be matched with the winding speed, reducing the occurrence of deceleration or shutdown of the winding equipment 100 during the winding process, thereby improving the production efficiency of the electrode assembly.

[0259] An embodiment of the third aspect of the present application provides a battery manufacturing device, including the winding device 100 in the first aspect.

[0260] The battery manufacturing equipment provided in the embodiment of the present application can effectively improve the product quality and product yield of the electrode assembly by adopting the winding device 100 in the first aspect, thereby improving the reliability and safety of the battery device.

[0261] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A winding device, characterized in that: include: An unwinding mechanism, used for unwinding a first diaphragm, a first pole piece, a second diaphragm and a second pole piece, wherein the first diaphragm has a first surface; A gluing mechanism is arranged at the discharge side of the unwinding mechanism, and the gluing mechanism comprises two gluing members arranged at intervals, and the two gluing members are respectively used to apply glue on the edges of the two opposite sides of the first surface, so as to form edge sealing areas on the two sides of the first surface respectively; A pressing mechanism, provided at the discharge side of the glue coating mechanism, the pressing mechanism is used to press the first diaphragm, the first pole piece, the second diaphragm and the second pole piece to form a laminated sheet body, and to bond the edge sealing area to the second diaphragm; The winding mechanism is arranged at the discharge side of the pressing mechanism, and is used for winding the stacked sheets to form an electrode assembly.

2. The winding device according to claim 1, characterized in that The winding device further includes a first composite mechanism disposed between the glue coating mechanism and the pressing mechanism, and the first composite mechanism is used to make the first diaphragm and the first pole piece adhere to each other to form a first composite sheet body.

3. The winding device according to claim 2, characterized in that The winding device further includes a first cutting device, which is disposed on the feeding side of the first composite mechanism and is used to cut off the first pole piece, and the first cutting device includes a cam cutter.

4. The winding device according to claim 3, characterized in that The winding device further includes a resisting member, which is arranged opposite to the first cutting device and is used to support the first pole piece, and the first cutting device is used to cut off the first pole piece on the resisting member.

5. The winding device according to claim 4, characterized in that The abutting member is a vacuum adsorption roller.

6. The winding device according to claim 3, characterized in that The winding device further includes a conveying member disposed between the first cutting device and the first composite mechanism, and the conveying member is used to convey the first pole piece.

7. The winding device according to claim 6, characterized in that The conveying member comprises a vacuum adsorption conveyor belt.

8. The winding device according to claim 1, characterized in that The winding device further comprises a second composite mechanism disposed on the feeding side of the pressing mechanism, and the second composite mechanism is used to make the second diaphragm and the second pole piece bonded to each other to form a second composite sheet body.

9. The winding device according to claim 8, characterized in that The winding equipment also includes a second cutting device and a gluing mechanism, wherein the second cutting device is arranged on the feeding side of the second composite mechanism, and the second cutting device is used to cut off the second pole piece, and the gluing mechanism is arranged on the discharging side of the second composite mechanism, and the gluing mechanism is used to glue the head end and / or tail end of the second pole piece to fix the second pole piece and the second diaphragm.

10. The winding device according to claim 8, characterized in that The winding device further includes a buffer mechanism disposed between the second composite mechanism and the pressing mechanism, and the buffer mechanism is used for buffering the second composite sheet.

11. The winding device according to claim 1, characterized in that The winding device also includes a third cutting device, which is arranged adjacent to the winding mechanism and is used to cut off the superimposed sheets. The third cutting device includes a cam cutter.

12. The winding device according to any one of claims 1 to 11, characterized in that The glue coating mechanism also includes a mounting rod, and the two glue coating members are arranged on the mounting rod, and the distance between the two glue coating members is adjustable.

13. The winding device according to claim 12, characterized in that The glue coating member is rotatably sleeved on the mounting rod. The glue coating mechanism further comprises a driving member, which is used to drive the glue coating member to rotate around the mounting rod so as to make the glue coating member approach or move away from the first surface.

14. The winding device according to any one of claims 1 to 11, characterized in that The glue coating member has a coating head, and the diameter of the coating head is d1, 0.5mm≤d1≤1mm.

15. A winding method, characterized in that: include: Providing a first diaphragm, a first pole piece, a second diaphragm and a second pole piece, wherein the first diaphragm has a first surface; Applying glue on the edges of the two opposite sides of the first surface to form edge-sealing areas on the two sides of the first surface, wherein the first pole piece includes a first pole ear, and applying glue intermittently on the edge of the first surface for bonding to one side of the first pole ear to form the edge-sealing area with a space-avoiding position; Pressing the first diaphragm, the first pole piece, the second diaphragm and the second pole piece to form a laminated sheet body, and bonding the edge sealing area to the second diaphragm; The laminated sheets are wound to form an electrode assembly.

16. The winding method according to claim 15, characterized in that: Along the length direction of the first diaphragm, the length of the first pole ear is l1, the length of the avoidance position is l2, and l1+6.5mm≤l2≤l1+10.5mm.

17. The winding method according to claim 15, characterized in that: Along the width direction of the first diaphragm, the width of the edge sealing area is w, 0.1mm≤w≤0.3mm.

18. The winding method according to claim 15, characterized in that: The first pole piece includes a first main body, the first surface has a patch area for bonding to the first main body, and along the width direction of the first diaphragm, the distance between the edge sealing area and the patch area is d2, 1.75mm≤d2≤2.25mm.

19. The winding method according to any one of claims 15 to 18, characterized in that: Before pressing the first diaphragm, the first pole piece, the second diaphragm and the second pole piece, the winding method further includes: pressing the first diaphragm and the first pole piece to form a first composite sheet body.

20. The winding method according to claim 19, characterized in that Before pressing the first diaphragm and the first pole piece to form a first composite sheet body, the winding method further includes: cutting the first pole piece by using a cam cutter.

21. The winding method according to claim 20, characterized in that After cutting the first pole piece by using a cam cutter, the winding method further includes: transporting the first pole piece by using a vacuum adsorption conveyor belt.

22. The winding method according to any one of claims 15 to 18, characterized in that: Before pressing the first diaphragm, the first pole piece, the second diaphragm and the second pole piece, the winding method further includes: pressing the second diaphragm and the second pole piece to form a second composite sheet body.

23. The winding method according to claim 22, characterized in that Before pressing the second diaphragm and the second pole piece to form a second composite sheet, the winding method also includes: cutting the second pole piece with a cutter; and after pressing the second diaphragm and the second pole piece to form a second composite sheet, the winding method also includes: applying glue to the leading end and / or the trailing end of the second composite sheet to fix the second pole piece and the second diaphragm.

24. The winding method according to claim 23, characterized in that After pressing the second diaphragm and the second pole piece to form a second composite sheet body, the winding method further includes: buffering the second composite sheet body.

25. The winding method according to any one of claims 15 to 18, characterized in that: Winding the laminated sheets to form an electrode assembly includes: using a vacuum winding needle to wind the laminated sheets.

26. The winding method according to any one of claims 15 to 18, characterized in that: After winding the superposed sheet body, the winding method further comprises: cutting the superposed sheet body by using a cam cutter.

27. A battery manufacturing device, characterized in that: Comprising a winding device as claimed in any one of claims 1 to 14.

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