Winding apparatus, winding method, and battery manufacturing apparatus

Abstract

The application is suitable for the technical field of batteries, and provides a winding device, a winding method and a battery manufacturing device. The winding device comprises a 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 has a first surface. The gluing mechanism comprises two spaced-apart gluing members. The two gluing members are respectively used for gluing the edges on the opposite sides of the first surface to form edge sealing areas on the two sides of the first surface. 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 sheet body and make the edge sealing areas adhere to the second diaphragm. The winding mechanism is used for winding the laminated sheet body to form an electrode assembly. The technical scheme provided by the application can solve the technical problems that the diaphragm is prone to displacement and the edges of the diaphragm are prone to folding during the manufacturing process of the electrode assembly.

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

[0002] In the production process of a battery, winding of an electrode assembly is a very important process. At present, a commonly used winding device can wind a cathode sheet, an anode sheet and two layers of separators to form an electrode assembly after the cathode sheet, the anode sheet and the two layers of separators are stacked in a certain order. However, due to the lack of a reliable fixing structure, problems such as folding of the edge of the separator and displacement of the separator are prone to occur during the winding process. These problems not only affect the appearance of the electrode assembly, but also can cause internal short circuit of the electrode assembly in severe cases, thereby affecting the overall performance and reliability of the battery. SUMMARY

[0003] Therefore, the embodiments of the present application provide a winding device, a winding method and a battery manufacturing device to solve the technical problems that the separator is prone to displacement and the edge of the separator is prone to folding during the production process of the electrode assembly.

[0004] The embodiments of the first aspect of the present application provide a winding device, comprising: a unwinding mechanism configured to unwind a first separator, a first electrode sheet, a second separator and a second electrode sheet, the first separator having a first surface; a gluing mechanism disposed on the discharge side of the unwinding mechanism, the gluing mechanism configured to glue the edge of at least one side of the first surface to form an edge sealing area on the first surface; a pressing mechanism disposed on the discharge side of the gluing mechanism, the pressing mechanism configured to press the first separator, the first electrode sheet, the second separator and the second electrode sheet to form a laminated sheet body, and make the edge sealing area adhere to the second separator; and a winding mechanism disposed on the discharge side of the pressing mechanism, the winding mechanism configured to wind the laminated sheet body to form an electrode assembly.

[0005] In the above embodiment, the discharging side of the unwinding mechanism is sequentially provided with the gluing mechanism and the pressing mechanism. The gluing mechanism can glue the first surface of the first diaphragm and form an edge sealing area on at least one side of the first surface. The pressing mechanism can press the first diaphragm, the first pole piece, the second diaphragm and the second pole piece to form a laminated sheet body, and make the edge sealing area of the first diaphragm adhere to the second diaphragm. In this way, the edges of at least one side of the first diaphragm and the second diaphragm in the laminated sheet body are adhered and fixed during transmission to the winding mechanism, so that the positions of the first diaphragm and the second diaphragm can be kept relatively stable during winding, thereby effectively reducing the risk of displacement of the first diaphragm and the second diaphragm or folding of the edges of the diaphragm due to lack of fixation. At the same time, since the materials in the laminated sheet body are combined more closely, when auxiliary winding is performed by using a vacuum winding needle or the like, the vacuum winding needle can adsorb the entire laminated sheet body, thereby avoiding the problem of folding or sliding of only the inner diaphragm and the outer diaphragm due to insufficient adsorption force. The above winding equipment can be used to manufacture electrode assemblies, and can solve the problem of easy folding and displacement of diaphragms during manufacturing, effectively improving the product quality and yield of electrode assemblies, and improving the reliability of electrode assemblies and related battery devices.

[0006] In some embodiments, the winding equipment further comprises a first composite mechanism arranged between the gluing 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.

[0007] By using the first composite mechanism to pre-press the first pole piece and the first diaphragm, the alignment accuracy between the first pole piece and the first diaphragm can be improved, and the first composite sheet body formed by pressing the first pole piece and the first diaphragm has higher mechanical strength, which is beneficial to reduce the risk of displacement or folding of the first pole piece and the first diaphragm during subsequent pressing of the laminated sheet body.

[0008] In some embodiments, the winding equipment further comprises a first cutting device arranged on the feeding side of the first composite mechanism and used to cut the first pole piece, and the first cutting device comprises a cam cutter.

[0009] By using the cam cutter to cut the first pole piece, the occurrence of deceleration or shutdown of the winding equipment can be reduced, thereby being beneficial to improve the production efficiency of the winding equipment.

[0010] In some embodiments, the winding equipment further comprises a stopper arranged opposite to the first cutting device and used to support the first pole piece, and the first cutting device is used to cut the first pole piece on the stopper.

[0011] By using the stopper, reliable support can be provided for the first pole piece to prevent deformation or displacement of the first pole piece during cutting due to cutting pressure, 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 suction roller can suck and fix the first pole piece by air pressure, and the first pole piece is not easy to be damaged. In addition, the vacuum suction roller can rotate and drive the first pole piece to advance, so as to reduce the wear of the first pole piece when passing through the abutting member.

[0014] In some embodiments, the winding device further comprises a conveying member arranged between the first cutting device and the first laminating mechanism, and the conveying member is used for conveying the first pole piece.

[0015] With the above design, the conveying member can be arranged to fix the cut first pole piece, so as to improve the conveying stability of the first pole piece. In some cases, the conveying member can also provide conveying power to avoid the problem of lack of conveying power due to cutting of the first pole piece.

[0016] In some embodiments, the conveying member comprises a vacuum suction conveying belt.

[0017] With the above design, the vacuum suction conveying belt has a large contact area with the first pole piece, and can stably suck and convey the first pole piece. The first pole piece is not easy to be warped, displaced or slipped during the conveying process. In addition, the vacuum suction conveying belt can suck and fix the first pole piece by air pressure, so as to avoid causing pressure damage to the first pole piece during the conveying process.

[0018] In some embodiments, the winding device further comprises a second laminating mechanism arranged on the feeding side of the pressing mechanism, and the second laminating mechanism is used for attaching the second diaphragm and the second pole piece to form a second laminated piece.

[0019] With the above design, the second laminating mechanism is used to pre-press the second pole piece and the second diaphragm, so as to improve the alignment accuracy between the two, and the second laminated piece formed by pressing the second pole piece and the second diaphragm has higher mechanical strength, which is beneficial to reduce the risk of displacement or folding of the second pole piece and the second diaphragm during the subsequent laminating process.

[0020] In some embodiments, the winding device further comprises a second cutting device and a rubberizing mechanism. The second cutting device is arranged on the feeding side of the second laminating mechanism, and is used for cutting the second pole piece. The rubberizing mechanism is arranged on the discharging side of the second laminating mechanism, and is used for rubberizing the leading end and / or the trailing end of the second pole piece to fix the second pole piece and the second diaphragm.

[0021] By adopting the above design, the first end or the tail end of the second pole piece is adhered and fixed to the second diaphragm by using the adhesive structure to adhere the first end and the tail end of the second pole piece in the second composite sheet body, so that the close fit of the second pole piece and the second diaphragm can be improved, and the second composite sheet body can be prevented from being easily scattered during transmission and winding.

[0022] In some embodiments, the winding device further comprises a buffering mechanism arranged between the second composite mechanism and the pressing mechanism, and the buffering mechanism is used for buffering the second composite sheet body.

[0023] By adopting the above design, the second composite sheet body is temporarily stored by using the buffering mechanism, which can reduce the negative impact of cutting the second pole piece on the feeding of the winding device. In actual operation, the buffering mechanism can also adjust the buffering length of the second composite sheet body according to the operation of the winding mechanism to realize continuous feeding, thereby reducing the occurrence of deceleration or shutdown of the winding device, and further improving the production efficiency of the winding device.

[0024] In some embodiments, the winding device further comprises a third cutting device adjacent to the winding mechanism and used for cutting the laminated sheet body, and the third cutting device comprises a cam cutter.

[0025] By adopting the above design, the laminated sheet body is cut by using the cam cutter, which can reduce the occurrence of deceleration or shutdown of the winding device, thereby facilitating the improvement of the production efficiency of the winding device.

[0026] In some embodiments, the gluing mechanism comprises two spaced-apart gluing members, and the two gluing members are respectively used for gluing the edges on opposite sides of the first surface.

[0027] By adopting the above design, the edges on both sides of the first diaphragm and the second diaphragm can be adhered and fixed by the glue in the edge sealing area, so that the edge fixing effect of the first diaphragm and the second diaphragm and the connection reliability between the layers can be further improved.

[0028] In some embodiments, the gluing mechanism further comprises a mounting rod, and the two gluing members are arranged on the mounting rod and the spacing between the two gluing members is adjustable.

[0029] By adopting the above design, the spacing between the two gluing members is adjustable, so that the gluing mechanism can be suitable for first diaphragms of different sizes and meet various gluing requirements, thereby effectively improving the versatility of the gluing mechanism and the winding device.

[0030] In some embodiments, the gluing member is rotatably sleeved on the mounting rod, and the gluing mechanism further comprises a driving member for driving the gluing member to rotate around the mounting rod so as to make the gluing member approach or move away from the first surface.

[0031] With the above design, the position of the gluing member is flexible, and in actual application, by adjusting the distance between the gluing member and the first surface, various gluing requirements can be met, and the gluing effect can be improved.

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

[0033] With the above design, by reasonably limiting the size of the coating head, the requirements of gluing precision and gluing efficiency can be balanced.

[0034] The second aspect of the application provides a winding method, comprising: providing a first diaphragm, a first pole piece, a second diaphragm and a second pole piece, the first diaphragm having a first surface; gluing the edges of at least one side of the first surface to form an edge sealing area on the first surface; 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; winding the laminated sheet body to form an electrode assembly.

[0035] In the above embodiment, the winding step further comprises a gluing step and a pressing step, wherein the gluing step comprises gluing the edges of at least one side of the first surface to form an edge sealing area, and the pressing step comprises 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 of the first diaphragm to the second diaphragm. In this way, by bonding and fixing at least one side of the first diaphragm and the second diaphragm, the 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 remain relatively stable during winding, effectively reducing the risk of displacement of the first diaphragm and the second diaphragm or folding of the edges of the diaphragm due to lack of fixation. When assisted winding is performed using a vacuum winding needle or the like, the vacuum winding needle can adsorb the entire laminated sheet body, avoiding the problem of folding or slipping of the inner diaphragm and the outer diaphragm due to insufficient adsorption force. The above winding method can be used to manufacture an electrode assembly, and can solve the problem of easy folding and displacement of the diaphragm during manufacturing, effectively improving the product quality and yield of the electrode assembly, and improving the reliability of the electrode assembly and related battery devices.

[0036] In some embodiments, gluing the edges of at least one side of the first surface comprises: gluing the edges of opposite sides of the first surface to form two edge sealing areas on the first surface.

[0037] With the above design, edge sealing areas can be formed on both sides of the first surface, and after subsequent pressing treatment, the edges of the first diaphragm and the second diaphragm are bonded and fixed, which can further improve the edge fixing effect of the first diaphragm and the second diaphragm and the connection reliability between the layers, thereby preventing the diaphragm from being displaced and the edges from being folded during winding.

[0038] In some embodiments, the first tab is included in the first polar piece, and the edge of the first surface at least one side of which is coated with glue includes: intermittently coating the edge of the first surface at one side for fitting the first tab to form an edge sealing area with a void.

[0039] With the above design, by reserving the void, the glue can be prevented from being bonded to the first tab, thereby preventing the glue from polluting or interfering with the first tab, and ensuring that the first tab can maintain good electrical effect.

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

[0041] With the above design, by making the size of the void larger than the size of the first tab, a tolerance space can be provided to accept the assembly error between the first diaphragm and the first polar piece, further reducing the risk of the glue being bonded to the first tab. At the same time, the size of the void is reasonably designed, which can not only provide a reliable safety margin, but also avoid the void being designed too large to affect the bonding effect of the first polar 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 0.1mm≤w≤0.3mm.

[0043] With the above design, the size of the edge sealing area is reasonable, which 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 polar piece includes a first main body part, and the first surface has a patch area for fitting the first main body part. Along the width direction of the first diaphragm, the distance between the edge sealing area and the patch area is d2, and 1.75mm≤d2≤2.25mm.

[0045] With the above design, by spacing the edge sealing area and the patch area, a tolerance space can be provided to accept the assembly error between the first diaphragm and the first polar piece, thereby preventing the glue of the edge sealing area from being bonded to the first main body part of the first polar piece. At the same time, the distance 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 space waste and material waste caused by the distance between them being too large.

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

[0047] By adopting the above design, the first pole piece and the first diaphragm are pre-pressed to ensure the alignment accuracy therebetween, and the first composite piece formed by pressing the first pole piece and the first diaphragm has higher mechanical strength, which is also conducive to reducing the risk of displacement or folding of the first pole piece and the first diaphragm in the pressing process of the subsequent laminated piece.

[0048] In some embodiments, before pressing the first diaphragm and the first pole piece to form the first composite piece, the winding method further comprises: cutting the first pole piece by using a cam cutter.

[0049] By adopting the above design, the cam cutter can periodically perform the cutting action during the transmission of the first pole piece, and the cutting period can be set according to the preset length of the first pole piece and the transmission line speed. By cutting the first pole piece by using the cam cutter, the situation of deceleration or shutdown of the winding equipment can be reduced, thereby facilitating the improvement of the manufacturing efficiency of the electrode assembly.

[0050] In some embodiments, after cutting the first pole piece by using the cam cutter, the winding method further comprises: conveying the first pole piece by using a vacuum suction conveying belt.

[0051] By adopting the above design, the vacuum suction conveying belt can stably adsorb and convey the first pole piece, and the first pole piece is not prone to warping, displacement or slipping during the conveying process, and the first pole piece will not be damaged by pressure, and the reliability is higher.

[0052] In some embodiments, before pressing the first diaphragm, the first pole piece, the second diaphragm and the second pole piece, the winding method further comprises: pressing the second diaphragm and the second pole piece to form a second composite piece.

[0053] By adopting the above design, the second pole piece and the second diaphragm are pre-pressed to ensure the alignment accuracy therebetween, and the second composite piece formed by pressing the second pole piece and the second diaphragm has higher mechanical strength, which is also conducive to reducing the risk of displacement or folding of the second pole piece and the second diaphragm in the pressing process of the subsequent laminated piece.

[0054] In some embodiments, before pressing the second diaphragm and the second pole piece to form the second composite piece, the winding method further comprises: cutting the second pole piece by using a cutter; and after pressing the second diaphragm and the second pole piece to form the second composite piece, the winding method further comprises: gluing the first end and / or the tail end of the second composite piece to fix the second pole piece and the second diaphragm.

[0055] By adopting the above design, by gluing at least one of the first end and the tail end of the second pole piece, the first end or the tail end of the second pole piece is fixedly bonded to the second diaphragm, which can effectively improve the close fit of the second pole piece and the second diaphragm, thereby ensuring that the second composite piece is not prone to be scattered, and the second pole piece and the second diaphragm are not prone to slip.

[0056] In some embodiments, after the second separator and the second tab are crimped to form the second composite sheet, the winding method further comprises: buffering the second composite sheet.

[0057] With the above design, by temporarily storing the second composite sheet, the negative impact of the second tab cutting step on the supply can be reduced. In actual production, the buffering length of the second composite sheet can be adjusted according to the winding condition of the composite sheet to realize continuous supply, thereby reducing the occurrence of winding equipment deceleration or shutdown during processing, which is conducive to improving the production efficiency of the electrode assembly.

[0058] In some embodiments, winding the composite sheet to form the electrode assembly comprises: winding the composite sheet by using a vacuum winding needle.

[0059] With the above design, the vacuum winding needle can adsorb the composite sheet by negative pressure, without the need to configure an additional clamping device, and the winding process is stable and the tab and the separator are not easy to be damaged, thereby facilitating the improvement of the product quality of the electrode assembly.

[0060] In some embodiments, after the composite sheet is wound, the winding method further comprises: cutting the composite sheet by using a cam cutter.

[0061] With the above design, the first separator and the second separator are cut by using the cam cutter, which can reduce the occurrence of winding equipment deceleration or shutdown, thereby facilitating the improvement of the production efficiency of the electrode assembly.

[0062] Embodiments of the third aspect of the present application provide a battery manufacturing device comprising the winding device of the first aspect.

[0063] The battery manufacturing device provided by the embodiments of the present application can effectively improve the product quality and yield of the electrode assembly by using the winding device of the first aspect, thereby improving the reliability and safety of the battery device.

[0064] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0065] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or conventional technical description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any inventive labor.

[0066] Figure 1 is a structural schematic diagram of a winding device provided by an embodiment of the present application;

[0067] Figure 2 is a structural schematic diagram of a first composite sheet body provided by an embodiment of the present application;

[0068] Figure 3 is a structural schematic diagram of a gluing device provided by an embodiment of the present application;

[0069] Figure 4 is a structural schematic diagram of the gluing device from another perspective provided by an embodiment of the present application;

[0070] Figure 5 is a flowchart of a winding method provided by an embodiment of the present application;

[0071] Figure 6 is a flowchart of a winding method provided by another embodiment of the present application.

[0072] The meanings of the labels in the figures are as follows:

[0073] 100, winding device;

[0074] 10, unwinding mechanism; 11, first unwinding roller; 12, second unwinding roller; 13, third unwinding roller; 14, fourth unwinding roller;

[0075] 20, gluing mechanism; 21, gluing member; 21a, coating head; 22, mounting rod; 23, driving member;

[0076] 30, pressing mechanism;

[0077] 40, winding mechanism;

[0078] 51, first compounding mechanism; 52, second compounding mechanism;

[0079] 61, first cutting device; 62, abutting member; 63, conveying member;

[0080] 71, second cutting device; 72, gluing mechanism; 73, buffering mechanism; 731, fixed roller; 732, floating roller;

[0081] 80, third cutting device;

[0082] 90, passing roller;

[0083] 210, first diaphragm; 211, edge sealing area; 212, empty space avoiding position; 220, first pole piece; 221, first main body part; 222, first tab; 230, second diaphragm; 240, second pole piece; 250, laminated sheet body; 260, first composite sheet body; 270, second composite sheet body. DETAILED DESCRIPTION

[0084] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0085] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0086] 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0087] In this paper, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0088] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0089] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0090] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0091] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", etc. should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled 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.

[0092] The electrode assembly is the core part of the battery cell. In the production process of the winding type battery, the winding equipment is used to wind the pole piece and the separator to form the electrode assembly. In the commonly used winding equipment and winding method, the cathode sheet, the anode sheet and the two layers of separators can be fed respectively and stacked in a certain order before being transmitted to the winding mechanism for winding.

[0093] In the electrode assembly, in order to reliably isolate the two pole pieces, the size of the separator is generally larger than that of the pole piece, so that the two side edges of the separator can exceed the pole piece. However, due to the soft structure of the separator itself, and the lack of reliable fixing structure of the edges of the two layers of separators, the edges of the separator are prone to folding and displacement during winding. In addition, the surfaces in contact between the pole piece and the separator and between the two layers of separators are usually only attached together by their own tension, and this combination has relatively low reliability. During winding, especially when auxiliary winding is performed by using a vacuum winding needle and the like, the inner layer of the separator can be effectively adsorbed, while the outer layer of the separator is prone to folding or sliding due to insufficient adsorption force.

[0094] To solve the above problems, the embodiment of the present application provides a winding device, which comprises a unwinding mechanism, a gluing mechanism, a pressing mechanism and a winding mechanism, wherein the gluing mechanism is used for gluing the edges of the first surface of the first diaphragm to form an edge sealing area on the first surface, 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 the edge sealing area on the first diaphragm is bonded with 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 be kept relatively stable during winding, the diaphragm is not easy to shift, and the edges of the diaphragm are not easy to fold. When the winding is assisted by a vacuum winding needle or the like, the vacuum winding needle can simultaneously adsorb the entire laminated piece body, thereby avoiding the problem that only the inner diaphragm is adsorbed, and the outer diaphragm is folded or shifted due to insufficient adsorption force.

[0095] The winding device provided by the embodiment of the present application can wind to form a cylindrical electrode assembly, or can wind 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 monomer. The battery monomer can be used in an electric device using a battery as a power source or various energy storage systems using a battery as an energy storage element. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0096] In order to illustrate the technical solutions provided by the present application, the following will be described in detail in combination 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 to each other.

[0097] The embodiment of the first aspect of the present application provides a winding device 100 for manufacturing an electrode assembly.

[0098] Please refer to Figure 1 and Figure 2 , Figure 1 the structure schematic diagram of the winding device 100 provided by the embodiment of the present application, Figure 2The structure schematic diagram of the first diaphragm 210 and the first pole piece 220 provided by the embodiment of the application, the winding equipment 100 provided by the embodiment of the application comprises a unwinding mechanism 10, a gluing mechanism 20, a pressing mechanism 30 and a winding mechanism 40. The unwinding mechanism 10 is used for unwinding 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 at the discharging side of the unwinding mechanism 10, and the gluing mechanism 20 is used for gluing the edge of at least one side of the first surface to form an edge sealing area 211 on the first surface. The pressing mechanism 30 is arranged at the discharging side of the gluing mechanism 20, and the pressing mechanism 30 is used for 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, and the edge sealing area 211 is bonded with the second diaphragm 230. The winding mechanism 40 is arranged at the discharging side of the pressing mechanism 30, and the winding mechanism 40 is used for winding the laminated sheet body 250 to form an electrode assembly.

[0099] The unwinding mechanism 10 refers to a structure for providing pole pieces and diaphragms in the winding equipment 100. The unwinding mechanism 10 can comprise a plurality of unwinding parts for unwinding the first diaphragm 210, the first pole piece 220, the second diaphragm 230 and the second pole piece 240, respectively, and the unwinding part can be but is not limited to a roller body, a reel, a shaft or the like structure. The unwinding mechanism 10 can comprise a passive structure, that is, the unwinding mechanism 10 needs to pull the pole pieces and diaphragms by other structures in the winding equipment 100 to realize the unwinding feeding, and the unwinding mechanism 10 can also comprise an active structure, for example, a motor or the like structure can be used to control the unwinding feeding of the pole pieces and diaphragms. The unwinding mechanism 10 needs to accurately control the unwinding speed, tension and other parameters during use, so as to ensure the stability and flatness of the diaphragm and pole piece conveying.

[0100] The gluing mechanism 20 refers to a structure in the winding device 100 for gluing on the first diaphragm 210. The gluing mechanism 20 is located on the discharge side of the unwinding mechanism 10, specifically, the gluing mechanism 20 is located in the area passed by the first diaphragm 210 after being output from the unwinding mechanism 10. The gluing mechanism 20 can include one or more glue applying parts 21, which directly contact the first surface of the first diaphragm 210 to apply glue on the first surface. Along the width direction X of the first diaphragm 210, the first surface includes two opposite sides, and the gluing mechanism 20 can be used to glue the edges on one side of the first surface or glue the edges on both sides of the first surface at the same time. The edge sealing area 211 refers to the part of the first surface that is glued. The gluing action is synchronized 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, which means that the gluing mechanism 20 continuously glues along the side of the first surface to form a continuous glue line, i.e., a continuous edge sealing area 211. The gluing mechanism 20 can also be set to intermittent gluing, which means that the gluing is intermittent according to a certain interval along the side of the first surface to form a point or line-shaped glue segment distributed at intervals.

[0101] The pressing mechanism 30 refers to a structure in the winding device 100 for pressing the pole piece and the diaphragm. The pressing mechanism 30 is located on the discharge side of the gluing mechanism 20, specifically, the pressing mechanism 30 is located in the area passed by the first diaphragm 210 after being output from the gluing mechanism 20, and the first pole piece 220, the first diaphragm 210 and the second pole piece 240 after being output from the unwinding mechanism 10. The pressing mechanism 30 can at least press the edge sealing area 211, and the interlayer gap of the contact surface of the first diaphragm 210 and the second diaphragm 230 is less than 0.15 mm after pressing, so as to ensure that the side edges of the first diaphragm 210 and the second diaphragm 230 can be bonded and fixed. For example, the pressing mechanism 30 can include a pressing roller, which is used to apply 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 closely attached under the action of tension.

[0102] 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 sequentially arranged, and the first diaphragm 210 and the second diaphragm 230 are distributed on the opposite sides of the first pole piece 220. In the width direction X, the two side edges of the first diaphragm 210 and the second diaphragm 230 directly contact each other, and in the edge sealing area 211, the first diaphragm 210 and the second diaphragm 230 are bonded by glue.

[0103] 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 on the discharge side of the pressing mechanism 30, specifically, the winding mechanism 40 is located in the area through which the laminated sheet body 250 passes after being output from the pressing mechanism 30. The winding mechanism 40 can include a winding needle for winding the laminated sheet body 250, and can also include a pressing member, a rubberizing member, a discharging member, and the like for tail-end processing.

[0104] The winding device 100 can further include a rack for providing an installation environment for the unwinding mechanism 10, the rubberizing mechanism 20, the pressing mechanism 30, the winding mechanism 40, and the conveying device, and an over roller 90 disposed between the devices and used to assist in conveying the pole piece and the separator.

[0105] In the winding device 100 provided by the embodiment, the discharge side of the unwinding mechanism 10 is sequentially provided with the rubberizing mechanism 20 and the pressing mechanism 30. The rubberizing mechanism 20 can apply rubber to the first surface of the first separator 210 and form an edge sealing area 211 on at least one side edge of the first surface. The pressing mechanism 30 can press the first separator 210, the first pole piece 220, the second separator 230, and the second pole piece 240 to form the laminated sheet body 250, and make the edge sealing area 211 of the first separator 210 adhere to the second separator 230. In this way, at least one side edge of the first separator 210 and the second separator 230 in the laminated sheet body 250 is adhered and fixed, which makes the positions of the first separator 210 and the second separator 230 relatively stable during the winding process, thereby effectively reducing the risk of displacement of the first separator 210 and the second separator 230 or folding of the separator edge due to lack of fixation. At the same time, since the materials in the laminated sheet body 250 are combined more tightly, when assisted winding is performed by using a vacuum winding needle or the like, the vacuum winding needle can adsorb the entire laminated sheet body 250, thereby avoiding the problem of folding or slipping of the inner separator and the outer separator due to insufficient adsorption force. In summary, the above winding device 100 can be used to manufacture an electrode assembly and can solve the problem of easy folding and displacement of the separator during the manufacturing process, effectively improving the product quality and yield of the electrode assembly, and improving the reliability of the electrode assembly and related battery devices.

[0106] Please refer to Figure 3 and Figure 4 , Figure 3 and Figure 4 is a structural schematic diagram of the rubberizing mechanism 20 provided by the embodiment. In some embodiments, the rubberizing mechanism 20 includes two rubberizing members 21 arranged at intervals, and the two rubberizing members 21 are respectively used to apply rubber to the edges on opposite sides of the first surface to form edge sealing areas on the two side edges of the first surface.

[0107] The gluing member 21 is a structure in the gluing mechanism 20 for contacting the first diaphragm 210 and performing a gluing action, and can include a coating head 21a, a glue supply system, etc. It should be noted that the two gluing members 21 can operate synchronously and independently perform the gluing action, and the gluing position and gluing amount of the gluing member 21 are determined according to the structure of the diaphragm and the pole piece.

[0108] In the above design, the two gluing members 21 are used to glue and form the edge sealing area 211 on the two side edges of the first diaphragm 210, and after subsequent pressing treatment, the two 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 the layers, thereby ensuring that the two side edges of the diaphragm will not be folded during winding, and further reducing the risk of displacement of the diaphragm.

[0109] In addition, in some cases, the first pole piece 220 is an anode piece, and the second pole piece 240 is a cathode piece. The anode piece may have a lithium deposition problem during long-term use, causing lithium ions to deposit on the surface of the first pole piece 220, bonding and fixing the two side edges of the first diaphragm 210 and the second diaphragm 230, which can create a relatively sealed environment for the first pole piece 220, thereby reducing the contact of lithium ions on the surface of the first pole piece 220 with external air, moisture or other impurities, which is also conducive to improving the safety of the electrode assembly.

[0110] It can be understood that the gluing position of the gluing mechanism 20 is not unique, for example, in other embodiments, the second diaphragm 230 includes a second surface opposite the first diaphragm 210, 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 for gluing the edge on one side of the first surface, and the other is used for gluing the edge on 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 side edges of the laminated piece 250; for example, in other embodiments, the gluing mechanism 20 can also include only one gluing member 21, which is used for gluing one side edge of the first surface.

[0111] Please refer to Figure 3 and Figure 4 In some embodiments, the gluing mechanism 20 further includes a mounting rod 22, and the two gluing members 21 are arranged on the mounting rod 22 and the spacing between the two gluing members 21 is adjustable.

[0112] The mounting rod 22 has a certain length and rigidity, and can reliably support and fix the gluing member 21. Optionally, in some embodiments, the installation position of the gluing member 21 on the mounting rod 22 can be adjusted, so as to realize the spacing adjustment between the two gluing members 21; or in some embodiments, the mounting rod 22 can also be designed as a telescopic rod, and the length of the mounting rod 22 is adjusted, so as to realize the spacing adjustment between the two gluing members 21.

[0113] The gluing mechanism 20 can be configured with a separate fixing frame, or the mounting rod 22 of the gluing mechanism 20 can be directly assembled on the rack of the gluing device.

[0114] In the above design, the spacing between the two gluing members 21 is adjustable, so that the gluing mechanism 20 can be applied to first diaphragms 210 of different sizes, and meet various gluing requirements, so that the gluing mechanism 20 and the winding device 100 have high versatility.

[0115] It can be understood that the fixing mode of the gluing member 21 is not unique, and in other embodiments, a mechanical arm can also be configured to install the gluing member 21.

[0116] In some embodiments, the spacing between the two gluing members 21 is 35mm-45mm. For example, the spacing between the two gluing members 21 can be 35mm, 40mm, or 45mm.

[0117] When the two gluing members 21 are used to glue the edges on both sides of the first surface respectively, it is necessary to ensure that the spacing between the two gluing members 21 matches the size of the first diaphragm 210, so as to ensure that the gluing member 21 can perform gluing work at the preset position.

[0118] In the above design, the spacing between the two gluing members 21 is reasonably set, which can meet the gluing requirements of diaphragms of conventional sizes, and can avoid unnecessary cost increase caused by excessively large adjustment range design of the gluing member 21.

[0119] It can be understood that the spacing between the two gluing members 21 is designed based on the actual size of the first diaphragm 210, and in other embodiments, if the width of the first diaphragm 210 is larger, the spacing between the two gluing members 21 can be 50mm, 55mm, 60mm, or even larger size.

[0120] Please refer to Figure 3 and Figure 4 In some embodiments, the gluing member 21 is rotatably sleeved on the mounting rod 22, and the gluing mechanism 20 further comprises a driving member 23, which is used to drive the gluing member 21 to rotate around the mounting rod 22, so as to make the gluing member 21 close to or away from the first surface.

[0121] For example, the glue applying member 21 can be sleeved on the mounting rod 22 through a bearing or the like, and the driving member 23 can be a rotary motor, which is independently connected to the glue applying member 21 and can drive the glue applying member 21 to rotate independently around the mounting rod 22. It can be understood that the driving member 23 is not limited to be a rotary motor, and in other embodiments, the driving member 23 can also be a screw rod, a handle or the like.

[0122] Since the glue applying member 21 is at least partially fixed on the mounting rod 22, the actual meaning of the glue applying member 21 approaching or moving away from the first surface is that the coating head 21a of the glue applying member 21 approaches or moves away from the first surface.

[0123] With the above design, on the one hand, the position of the glue applying member 21 is flexible, and in actual application, by adjusting the distance between the glue applying member 21 and the first surface, various glue applying requirements can be met, and the glue applying effect, including the glue applying thickness, the glue applying uniformity and the like, can be improved; on the other hand, by moving the glue applying member 21 away from the first surface, intermittent glue applying can be realized, and when the equipment is stopped, the glue applying member 21 can also be prevented from scalding the first diaphragm 210 at high temperature; in addition, in some cases, the driving member 23 is a rotary motor, which can automatically adjust the position of the glue applying member 21 during the operation of the equipment, so that the occurrence of the deceleration or stop of the winding equipment 100 can be reduced, thereby being beneficial to improving the production efficiency of the winding equipment 100.

[0124] In some embodiments, the distance between the glue applying member 21 and the first surface is controlled to be 0mm-15mm.

[0125] The distance between the glue applying member 21 and the first surface actually refers to the distance between the coating head 21a of the glue applying member 21 and the first surface. When the glue applying member 21 normally applies glue, the distance between the coating head 21a and the first surface can be 0mm, and when the equipment is temporarily stopped, the glue applying member 21 is lifted, and the distance between the coating head 21a and the first surface can be 15mm.

[0126] According to different setting modes of the glue applying member 21, the distance adjustment mode between the glue applying member 21 and the first diaphragm 210 is not unique. For example, the glue applying member 21 can be rotatably sleeved on the mounting rod 22 through a bearing, and at this time, the angle of the glue applying member 21 on the mounting rod 22 can be adjusted through the driving member 23, so as to adjust the distance between the coating head 21a and the first surface; for another example, the glue applying member 21 can also be installed on a mechanical arm, and at this time, the movement of the mechanical arm can be adjusted, so as to adjust the distance between the coating head 21a and the first surface; or, the glue applying member 21 can also be installed on a telescopic rod, and at this time, the length of the telescopic rod can be adjusted, so as to adjust the distance between the coating head 21a and the first surface.

[0127] Please refer to Figure 4In some embodiments, the glue applying member 21 has a glue applying head 21a, and the diameter of the glue applying head 21a is d1, 0.5mm≤d1≤1mm.

[0128] For example, the glue applying head 21a can be, but is not limited to, a spray glue applying head, a doctor blade glue applying head, a slit glue applying head, etc.

[0129] The size of the glue applying head 21a affects the glue applying width, the glue applying precision, the glue applying efficiency, etc. It can be understood that the glue applying precision is inversely proportional to the size of the glue applying head 21a, and the smaller the size of the glue applying head 21a, the easier to control the glue amount, and thus the higher the glue applying precision; the glue applying efficiency is proportional to the size of the glue applying head 21a, and the larger the size of the glue applying head 21a, the relatively more glue amount, and the higher the glue applying speed and the glue applying efficiency. In the above design, the size of the glue applying head 21a is reasonable, and the requirements of the glue applying precision and the glue applying efficiency can be balanced.

[0130] In some embodiments, the glue applying member 21 has a heat preservation effect, and the heat preservation range is 45-75℃.

[0131] The temperature of the glue applying member 21 affects the flowability, viscosity, curing speed, etc. of the glue. By using the above design, the glue can be kept at a suitable working temperature for a long time, reducing the risk of glue blocking the glue applying head 21a. In addition, maintaining the glue applying member 21 at a reasonable temperature range can also avoid the negative effects of environmental temperature changes on the performance of the glue, so that the performance of the glue remains stable for a long time, thereby facilitating the improvement of the consistency of the glue applying.

[0132] Please refer to Figure 1 In some embodiments, the winding device 100 further comprises a first laminating mechanism 51 arranged between the glue applying mechanism 20 and the pressing mechanism 30, and the first laminating mechanism 51 is used for laminating the first diaphragm 210 and the first pole piece 220 to form a first laminated piece 260.

[0133] The first laminating mechanism 51 refers to a structure in the winding device 100 for laminating the first pole piece 220 to the first diaphragm 210. The first laminating mechanism 51 can press the first pole piece 220 to the first diaphragm 210 by applying pressure, or can laminate the first pole piece 220 to the first diaphragm 210 by gluing or other means. For example, the first laminating mechanism 51 can include oppositely arranged pressing rollers, when the first pole piece 220 and the first diaphragm 210 are transmitted between the pressing rollers, the pressing 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 laminated to form the first laminated piece 260.

[0134] The first tab 220 includes a first body portion 221 and a first tab lug 222 connected to the first body portion 221, and in the first composite sheet body 260, the first body portion 221 is completely attached to the first surface of the first separator 210, and the first tab lug 222 protrudes from one side edge of the first separator 210 in the width direction X.

[0135] On the one hand, pre-pressing the first tab 220 and the first separator 210 can ensure the alignment accuracy between the two; on the other hand, the first composite sheet body 260 formed by pressing the first tab 220 and the first separator 210 has higher mechanical strength, which is also conducive to reducing the risk of displacement or folding of the first tab 220 and the first separator 210 during the subsequent pressing process of the laminated sheet body 250.

[0136] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a first cutting device 61, which is arranged on the feeding side of the first composite mechanism 51 and is used to cut the first tab 220. The first cutting device 61 includes a cam cutter.

[0137] The first tab 220 is supplied in a continuous roll, so during the manufacturing process, the first tab 220 needs to be cut according to a predetermined size in the length direction Y of the first tab 220 to prepare the required electrode assembly. The length of the first tab 220 and the specific cutting position need to be determined according to the design requirements of the electrode assembly and the winding method.

[0138] The first cutting device 61 refers to a structure in the winding device 100 for cutting the first tab 220. The first cutting device 61 is located on the feeding side of the first composite mechanism 51, specifically, the first cutting device 61 is located in the area passed by the first tab 220 before entering the first composite mechanism 51.

[0139] The cam cutter is a common automatic cutting tool that can periodically perform cutting actions. For example, the cam cutter can include a driving device, a cam, a rocker arm, and a cutter, which drives the cam to rotate, thereby driving the rocker arm to reciprocate, so that the cutter intermittently cuts the first tab 220; for another example, the cam cutter can include a driving device, a crank slider mechanism, and a cutter, which drives the crank slider mechanism to move, thereby driving the cutter to reciprocate, so that the cutter intermittently cuts the first tab 220.

[0140] The period of the cutting action performed by the cam cutter can be designed according to the preset length of the first tab 220 and the transmission line speed, wherein the transmission line speed of the first tab 220 refers to the transmission line speed of the first tab 220 before entering the first cutting device 61.

[0141] It can be understood that the first tab 220 is cut off to form a first composite sheet 260 with the first diaphragm 210, and the first diaphragm 210 is a continuous structure that can carry the cut-off first tab 220 to the subsequent station.

[0142] In the above design, on the one hand, in the electrode assembly, the length of the first diaphragm 210 generally needs to be greater than the length of the first tab 220, the first tab 220 is cut off before being combined with the first diaphragm 210, the operation is more difficult, and the cut length of the first tab 220 can be accurately controlled; on the other hand, the cam cutter can periodically perform the cutting action during the transmission of the first tab 220, and the cutting period can be set according to the preset length of the first tab 220 and the transmission line speed. The first tab 220 is cut off by using the cam cutter, which can reduce the occurrence of deceleration or shutdown of the winding device 100, thereby facilitating the improvement of the production efficiency of the winding device 100.

[0143] It can be understood that in other embodiments, the first cutting device 61 can also be a linear cutter, a laser cutter, etc. that moves linearly back and forth.

[0144] Please refer to Figure 1 In some embodiments, the winding device 100 further comprises an abutting piece 62, the abutting piece 62 is arranged opposite to the first cutting device 61 and is used to support the first tab 220, and the first cutting device 61 is used to cut off the first tab 220 on the abutting piece 62.

[0145] The abutting piece 62 has a smooth support surface, and the abutting piece 62 can be but is not limited to a flat plate structure, a cylindrical structure. The abutting piece 62 can be designed as a fixed structure, or can be designed as a rotatable structure, when the abutting piece 62 is rotatably arranged, it can assist in conveying the first tab 220. The first cutting device 61 is arranged spaced apart from the abutting piece 62 to ensure that the first tab 220 can smoothly pass between the two; in some cases, the distance between the first cutting device 61 and the abutting piece 62 is adjustable to adapt to first tabs 220 of different thicknesses.

[0146] With the above design, the abutting piece 62 can provide reliable support for the first tab 220 to prevent the first tab 220 from deforming or shifting due to cutting pressure during cutting, thereby ensuring that the first cutting device 61 can smoothly cut off the first tab 220.

[0147] In some embodiments, the abutting piece 62 is a vacuum suction roller.

[0148] The vacuum adsorption roller comprises a roller body, the surface of the roller body is provided with adsorption holes, the roller body is connected with a vacuumizing device, under the action of the vacuumizing 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 with a driving device and rotate under the action of the driving device, thereby driving the first pole piece 220 to advance.

[0149] The vacuum adsorption roller adsorbs and fixes the first pole piece 220 through air pressure, and the first pole piece 220 is not easy to be damaged; in some cases, the vacuum adsorption roller can rotate and drive the first pole piece 220 to advance, thereby also reducing the abrasion of the first pole piece 220 when passing through the abutting piece 62.

[0150] It can be understood that, in other embodiments, the abutting piece 62 can also comprise a conveying belt, a magnetic adsorption roller, an electrostatic adsorption roller, etc.

[0151] Please refer to Figure 1 In some embodiments, the winding device 100 further comprises a conveying piece 63 arranged between the first cutting device 61 and the first compounding mechanism 51, the conveying piece 63 being used for conveying the first pole piece 220.

[0152] Specifically, the conveying piece 63 is used for conveying the first pole piece 220 passing through the first cutting device 61 to the first compounding mechanism 51.

[0153] After the first pole piece 220 is cut, the head end and the tail end of the first pole piece 220 are not easy to be fixed, by arranging the conveying piece 63, the conveying piece 63 can play a fixing role on the cut first pole piece 220, thereby improving the conveying stability of the first pole piece 220, and in some cases, the conveying piece 63 can also provide conveying power, thereby avoiding the problem of lack of conveying power of the first pole piece 220 due to cutting.

[0154] In some embodiments, the conveying piece 63 comprises a vacuum adsorption conveying belt.

[0155] The vacuum adsorption conveying belt comprises a conveying belt, the surface of the conveying belt is provided with adsorption holes, the vacuum adsorption conveying belt is connected with a vacuumizing device, under the action of the vacuumizing device, the adsorption holes can adsorb the first pole piece 220 and fix the first pole piece 220 on the surface of the conveying belt; the conveying belt is also connected with a driving device, and the conveying belt can drive the first pole piece 220 to advance in the process of rotating.

[0156] Optionally, in a specific embodiment, the winding device 100 comprises the first cutting device 61, the vacuum adsorption roller and the vacuum adsorption conveying belt, the first cutting device 61 is arranged opposite to the vacuum adsorption roller, the vacuum adsorption roller is arranged adjacent to the vacuum adsorption conveying belt, the first pole piece 220 can pass through the vacuum adsorption roller and the vacuum adsorption conveying belt in sequence, and the first pole piece 220 is cut by the first cutting device 61 when passing through the first vacuum adsorption roller.

[0157] On the one hand, the vacuum adsorption conveying belt has a large contact area with the first pole piece 220, and can stably adsorb and convey the first pole piece 220. The first pole piece 220 is not prone to warping, displacement or slipping during the conveying process, and the vacuum adsorption conveying belt does not cause pressure damage to the first pole piece 220 during the conveying process because the vacuum adsorption conveying belt adsorbs the first pole piece 220 through air pressure. On the other hand, the vacuum adsorption conveying belt can adsorb impurities such as debris and dust in addition to the first pole piece 220, thereby reducing the negative effects of impurities on the first pole piece 220 and the processing environment.

[0158] In some embodiments, the conveying speed of the vacuum adsorption conveying belt matches the winding speed of the winding mechanism 40.

[0159] The conveying speed of the vacuum adsorption conveying belt refers to the length of the first pole piece 220 that can be conveyed by the vacuum conveying belt per unit time. The winding speed of the winding mechanism 40 refers to the length of the laminated sheet body 250 that can be wound by the winding mechanism 40 per unit time.

[0160] The conveying speed of the vacuum adsorption conveying belt matches the winding speed of the winding mechanism 40, which can reduce the occurrence of deceleration or shutdown of the winding device 100, and can 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.

[0161] It can be understood that in other embodiments, the conveying member 63 can also include conveying rollers, clamps, and the like.

[0162] Please refer to Figure 1 In some embodiments, the winding device 100 further comprises a second composite mechanism 52 arranged on the inlet side of the pressing mechanism 30. The second composite mechanism 52 is used to make the second diaphragm 230 and the second pole piece 240 adhere to each other to form a second composite sheet body 270.

[0163] The second composite mechanism 52 refers to a structure in the winding device 100 that makes the second pole piece 240 adhere 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 make the second pole piece 240 adhere to the second diaphragm 230 by gluing or other means. For example, the second composite mechanism 52 can include oppositely arranged pressing rollers. When the second pole piece 240 and the second diaphragm 230 are conveyed between the pressing rollers, the pressing rollers can press the second pole piece 240 and the second diaphragm 230 to make the second pole piece 240 and the second diaphragm 230 adhere to each other, thereby forming the second composite sheet body 270.

[0164] The second tab 240 includes a second body portion and a second lug connected to the second body portion, in the second composite sheet 270, the second body portion is completely attached to the second surface of the second separator 230, and the second lug protrudes from one side edge of the second separator 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, and in the laminated sheet 250 formed by pressing, the first lug 222 and the second lug are arranged staggered.

[0165] On the one hand, the second tab 240 and the second separator 230 are pressed in advance to ensure the alignment accuracy between them; on the other hand, the second composite sheet 270 formed by pressing the second tab 240 and the second separator 230 has higher mechanical strength, which also helps to reduce the risk of displacement or folding of the second tab 240 and the second separator 230 during the subsequent pressing of the laminated sheet 250.

[0166] It can be understood that in some other embodiments, the first separator 210, the first tab 220 and the second separator 230 can be first attached to form a composite sheet, and then the third composite sheet and the second tab 240 are pressed to form the laminated sheet 250; or the first separator 210 and the first tab 220 can be first attached to form a composite sheet, and then the composite sheet, the second separator 230 and the second tab 240 are pressed to form the laminated sheet 250.

[0167] Please refer to Figure 1 In some embodiments, the winding device 100 further includes a second cutting device 71 and a gumming 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 tab 240, the gumming mechanism 72 is arranged on the discharging side of the second composite mechanism 52, and the gumming mechanism 72 is used to gum the head end and / or tail end of the second tab 240 to fix the second tab 240 and the second separator 230.

[0168] The second tab 240 is supplied in continuous roll material, so it is necessary to cut the second tab 240 in the length direction Y according to the predetermined size during the manufacturing process to prepare the required electrode assembly. The length of the second tab 240 and the specific cutting position need to be determined according to the design requirements of the electrode assembly and the winding method.

[0169] The second cutting device 71 refers to a structure in the winding device 100 for cutting the second electrode tab 240. The second cutting device 71 is located on the feeding side of the second compounding mechanism 52, specifically, the second cutting device 71 is located on the area through which the second electrode tab 240 passes before being input into the second compounding mechanism 52. The second cutting device 71 can be, but is not limited to, a linear cutter reciprocating along a straight line, a laser cutter, etc., wherein the linear cutter is used in combination with a fixed cutter, and the linear cutter can move towards or away from the fixed cutter.

[0170] It can be understood that the second electrode tab 240 is cut off and adhered to the second diaphragm 230 to form the second composite tab 270, and the second diaphragm 230 is a continuous structure that can carry the cut second electrode tab 240 to the subsequent station.

[0171] The gluing mechanism 72 refers to a structure in the winding device 100 for gluing on the second composite tab 270. The gluing mechanism 72 is located on the discharging side of the second compounding mechanism 52, specifically, the gluing mechanism 72 is located on the area through which the second composite tab 270 passes after being output from the second compounding mechanism 52. The gluing mechanism 72 can include a gluing roller and a pressure adjusting device, the gluing roller is used for gluing on the second electrode tab 240 in the second composite tab 270, specifically, for gluing a fixed structure such as a tape or a paper on at least one of the leading end and the trailing end of the second electrode tab 240, so as to adhere and fix the leading end and / or the trailing end of the second electrode tab 240 to the second diaphragm 230, and the pressure adjusting device is used for adjusting the pressure of the gluing roller on the second composite tab 270, so as to realize the gluing action and ensure the gluing quality. The gluing mechanism 72 can be designed as a rotatable or movable structure, so as to realize gluing on different positions of the second electrode tab 240.

[0172] 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 tab 240, and the second electrode tab 240 is cut off before being compounded with the second diaphragm 230, which is of lower operation difficulty and is easy to accurately control the cutting length of the second electrode tab 240; on the other hand, the gluing structure is used for gluing on at least one of the leading end and the trailing end of the second electrode tab 240 in the second composite tab 270, so as to adhere and fix the leading end or the trailing end of the second electrode tab 240 to the second diaphragm 230, which can improve the close adhesion of the second electrode tab 240 and the second diaphragm 230, and ensure that the second composite tab 270 is not easy to be scattered during the transmission and winding process, and based on this, the second composite tab 270 can also realize long-line transmission.

[0173] Please refer to Figure 1 In some embodiments, the winding device 100 further comprises a buffer mechanism 73 arranged between the second compounding mechanism 52 and the pressing mechanism 30, and the buffer mechanism 73 is used for buffering the second composite tab 270.

[0174] The buffer mechanism 73 refers to a structure for temporarily storing the second composite web 270 in the winding device 100. The buffer mechanism 73 is located between the second compounding mechanism 52 and the pressing mechanism 30, specifically, the buffer mechanism 73 is located in the area through which the second composite web 270 passes after being output from the second compounding mechanism 52 and before being input into the pressing mechanism 30.

[0175] For example, the buffer mechanism 73 can include fixed rollers 731 and floating rollers 732 arranged at intervals, the fixed rollers 731 and the floating rollers 732 can be used for winding the second composite web 270 to temporarily store the second composite web 270, further, the fixed rollers 731 are fixed in position in the winding device 100, and the floating rollers 732 can move closer to or farther away from the fixed rollers 731 in a direction perpendicular to the conveying direction of the second composite web 270, so as to change the length of the second composite web 270 stored in the buffer mechanism 73. When the floating rollers 732 move towards the fixed rollers 731, the length of the second composite web 270 stored in the buffer mechanism 73 decreases, so as to release part of the second composite web 270; when the floating rollers 732 move away from the fixed rollers 731, the length of the second composite web 270 stored in the buffer mechanism 73 increases, so as to store a longer second composite web 270.

[0176] The fixed rollers 731 can be, but are not limited to, cylindrical roller bodies or prismatic roller bodies. The material of the fixed rollers 731 can be, but is not limited to, plastic, rubber, metal, etc. The fixed rollers 731 can be rotatably arranged relative to the rack of the winding device 100, or can be fixedly arranged relative to the rack; the fixed rollers 731 can be passive rollers and rotate with the movement of the second composite web 270, or the fixed rollers 731 can be active rollers and rotate by the driving of a motor or other driving device.

[0177] The floating rollers 732 can be, but are not limited to, cylindrical roller bodies or prismatic roller bodies. The material of the floating rollers 732 can be, but is not limited to, plastic, rubber, metal, etc. The floating rollers 732 can be rotatably arranged relative to the rack of the winding device 100, or can be fixedly arranged relative to the rack; the floating rollers 732 can be passive rollers and rotate with the movement of the second composite web 270, or the fixed rollers 731 can be active rollers and rotate by the driving of a motor or other driving device.

[0178] In the above design, the buffer mechanism 73 is used to temporarily store the second composite web 270, which can reduce the negative impact of cutting the second pole piece 240 on the feeding of the winding device 100. In actual operation, the buffer mechanism 73 can also adjust the length of the second composite web 270 according to the operation of the winding mechanism 40, so as to realize continuous feeding, thereby reducing the occurrence of deceleration or shutdown of the winding device 100, and further improving the production efficiency of the winding device 100.

[0179] Please refer to Figure 1 In some embodiments, the winding device 100 further comprises a third cutting device 80, which is arranged adjacent to the winding mechanism 40 and used to cut the laminated sheet 250, and the third cutting device 80 comprises a cam cutter.

[0180] The first diaphragm 210 and the second diaphragm 230 are supplied in the form of continuous rolls, and therefore the first diaphragm 210 and the second diaphragm 230 need to be cut after winding is completed to prepare the required electrode assembly.

[0181] The third cutting device 80 refers to a structure for cutting the first diaphragm 210 and the second diaphragm 230 in the winding device 100. The third cutting device 80 is arranged adjacent to the winding mechanism 40, and optionally, the cutter of the third cutting device 80 can be directed towards the winding mechanism 40 and pressed against the surface of the laminated sheet 250.

[0182] 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 the first diaphragm 210 and the second diaphragm 230 before or after the electrode assembly is wound, which is low in operation difficulty; on the other hand, the cam cutter can periodically perform cutting action during the winding process of the laminated sheet 250, and cutting the first diaphragm 210 and the second diaphragm 230 by the cam cutter can reduce the occurrence of deceleration or shutdown of the winding device 100, thereby facilitating the improvement of the production efficiency of the winding device 100.

[0183] It can be understood that in other embodiments, one or more cutting devices can also be arranged between the pressing mechanism 30 and the winding mechanism 40 to cut the first diaphragm 210 and the second diaphragm 230 synchronously or step by step, and the cutting device can be a linear cutter reciprocating along a straight line, a laser cutter, etc.

[0184] In some embodiments, the winding mechanism 40 comprises a vacuum winding needle.

[0185] The vacuum winding needle refers to a structure for winding the electrode assembly in the winding mechanism 40. The vacuum winding needle can be but is not limited to a cylindrical shape, a prism shape, etc., wherein the cylindrical vacuum winding needle can be used to form a cylindrical electrode assembly, and the prism-shaped vacuum winding needle can be used to form a square electrode assembly.

[0186] The vacuum winding needle can adsorb the laminated sheet 250 by negative pressure, without the need to configure an additional clamping device, and the winding process is high in stability and less likely to damage the electrode sheet and the diaphragm.

[0187] In some embodiments, the winding device 100 further comprises a plurality of conveying devices, which can be, but are not limited to, clamping jaws, over rollers 90, etc., and 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 pole piece and the separator.

[0188] In some embodiments, the winding device 100 further comprises a tailing mechanism for tailing the wound electrode assembly, for example, the tailing mechanism can comprise a mechanical hand which can be used to take the electrode assembly from the winding mechanism 40.

[0189] In a specific embodiment provided in the present application, please refer to Figure 1 , the winding device 100 comprises an unwinding mechanism 10, a gluing mechanism 20, a first cutting device 61, a stopping piece 62, a conveying piece 63, a first compounding mechanism 51, a second cutting device 71, a taping mechanism 72, a second compounding mechanism 52, a buffering mechanism 73, a pressing mechanism 30, a winding mechanism 40, and a third cutting device 80.

[0190] The unwinding mechanism 10 comprises first, second, third, and fourth unwinding rollers 11, 12, 13, and 14 arranged at intervals. In the initial state of the winding device 100, the first separator 210 is wound around the first unwinding roller 11, the first pole piece 220 is wound around the second unwinding roller 12, the second separator 230 is wound around the third unwinding roller 13, and the second pole piece 240 is wound around the fourth unwinding roller 14. In the working state of the winding device 100, the first unwinding roller 11 is used to unwind the first separator 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 separator 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, second, third, and fourth unwinding rollers 11, 12, 13, and 14 can be arranged from bottom to top, so that the first separator 210, the first pole piece 220, the second separator 230, and the second pole piece 240 are arranged in layers from bottom to top.

[0191] The gluing mechanism 20 is arranged on the discharge side of the first unwinding roller 11. The gluing mechanism 20 can include two gluing members 21, a mounting rod 22, and a rotating motor. The two gluing members 21 are sleeved on the mounting rod 22 and are arranged at intervals. The two gluing members 21 are respectively used for gluing two side edges of the first surface of the first diaphragm 210. The rotating motor is connected to the two gluing members 21 and can drive any gluing member 21 to rotate alone with the mounting rod 22 as the axis, so as to adjust the distance between the gluing member 21 and the first surface. The distance between the two gluing members 21 is 35mm-45mm. For example, the distance between the two gluing members 21 can be 35mm, 40mm, or 45mm. The gluing member 21 has a coating head 21a. The diameter of the coating head 21a is d1, and 0.5mm≤d1≤1mm. For example, the diameter of the coating head 21a can be 0.5mm, 0.8mm, or 1mm.

[0192] The first cutting device 61 is arranged on the discharge side of the second unwinding roller 12. The first cutting device 61 is used for cutting the first pole piece 220 output by the second unwinding roller 12. The first cutting device 61 can include a cam cutter.

[0193] The abutting member 62 is arranged on the discharge side of the second unwinding roller 12 and is arranged opposite to the first cutting device 61. The abutting member 62 can be a vacuum suction roller. The vacuum suction roller can suck and support the first pole piece 220, so as to prevent the first pole piece 220 from being deformed or displaced due to cutting pressure in the cutting process. The vacuum suction roller can include a roller body. The surface of the roller body is provided with suction holes. The suction holes can suck 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, so as to drive the first pole piece 220 to advance.

[0194] The conveying member 63 is arranged on the discharge side of the abutting member 62 and is arranged adjacent to the abutting member 62. The conveying member 63 can be a vacuum suction conveying belt. The vacuum suction conveying belt can receive the first pole piece 220 output by the abutting member 62 and convey the first pole piece 220 to a subsequent station. The vacuum suction conveying belt can include a conveying belt. The surface of the conveying belt is provided with suction holes. The suction holes can suck the first pole piece 220 and fix the first pole piece 220 on the surface of the conveying belt. The conveying belt is also connected to a driving device. The conveying belt can drive the first pole piece 220 to advance in the rotating process.

[0195] The first compounding mechanism 51 is arranged on the discharge side of the gluing mechanism 20 and the vacuum suction conveying belt. The first compounding mechanism 51 can include two oppositely arranged pressing rollers. When the first pole piece 220 and the first diaphragm 210 are conveyed between the two pressing rollers, the two pressing 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 attached to each other to form a first compound piece 260.

[0196] The second cutting device 71 is arranged at the discharge side of the fourth unwinding roller 14. The second cutting device 71 is used to cut the second pole piece 240 output by the fourth unwinding roller 14.

[0197] The second compounding mechanism 52 is arranged at the discharge side of the third unwinding roller 13 and the second cutting device 71. The second compounding mechanism 52 can include two oppositely arranged pressing rollers. When the second pole piece 240 and the second diaphragm 230 are transmitted between the two pressing rollers, the two 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 each other to form a second compounded piece 270.

[0198] The gluing mechanism 72 is arranged at the discharge side of the second compounding mechanism 52. The gluing mechanism 72 can include a gluing roller, which is used to glue the second pole piece 240 in the second compounded piece 270. Specifically, the gluing mechanism 72 is used to glue a fixing structure such as a tape or a paper on at least one of the head end and the tail end of the second pole piece 240, so as to bond and fix the head end and / or the tail end of the second pole piece 240 to the second diaphragm 230.

[0199] The buffering mechanism 73 is arranged at the discharge side of the gluing mechanism 72. The buffering mechanism 73 can include fixed rollers 731 and floating rollers 732 arranged at intervals, which can be used to wind the second compounded piece 270 to buffer the second compounded piece 270.

[0200] The pressing mechanism 30 is arranged at the discharge side of the first compounding mechanism 51 and the buffering mechanism 73. The pressing mechanism 30 can include a pressing roller, which can apply pressure to the first compounded piece 260 and the second compounded piece 270, so that the first compounded piece 260 and the second compounded piece 270 are tightly attached to each other under tension to form a laminated piece 250, and the side edges of the first diaphragm 210 and the second diaphragm 230 are bonded and fixed.

[0201] The winding mechanism 40 is arranged at the discharge side of the pressing mechanism 30. The winding mechanism 40 can include a vacuum winding needle, which is used to adsorb and wind the laminated piece 250 to form an electrode assembly. The vacuum winding needle can be, but is not limited to, a cylindrical shape, a prism shape, or the like.

[0202] The third cutting device 80 is arranged at the discharge side of the winding mechanism 40. The third cutting device 80 is used to cut the first diaphragm 210 and the second diaphragm 230 to prepare a required electrode assembly. The third cutting device 80 can be a cam cutter.

[0203] In summary, the winding device 100 provided by the embodiment of the present application has the following advantages: 1. By arranging the gluing mechanism 20 and the pressing mechanism 30, the surface of the first diaphragm 210 can be glued, and the edges of at least one side of the first diaphragm 210 and the second diaphragm 230 can be bonded and fixed. This design can improve the close-fitting property of the first diaphragm 210 and the second diaphragm 230, solve the problems of displacement of the diaphragm and folding of the edge during winding, and thus improve the product quality and yield of the electrode assembly; 2. By arranging the first composite mechanism 51 and the second composite mechanism 52, the first diaphragm 210 and the first tab 220 can be pre-pressed, and the second diaphragm 230 and the second tab 240 can be pre-pressed. This is conducive to improving the alignment accuracy of the diaphragm and the tab, and thus further improving the product quality of the electrode assembly. 3. By using the cam cutter to cut off the first tab 220, the first diaphragm 210 and the second diaphragm 230, and using the buffer mechanism 73 to buffer the second composite sheet body 270, the feeding speed of the tab and the diaphragm can be matched with the winding speed, the situation of deceleration or shutdown during the operation of the winding device 100 can be reduced, and thus the production efficiency of the winding device 100 is improved.

[0204] The embodiment of the second aspect of the present application provides a winding method for manufacturing an electrode assembly.

[0205] Please refer to Figure 1 and Figure 5 , Figure 5 The winding method provided by the embodiment of the present application is shown in the specific flowchart, and the winding method provided by the embodiment of the present application includes the following steps.

[0206] S10, providing a first diaphragm 210, a first tab 220, a second diaphragm 230 and a second tab 240, the first diaphragm 210 has a first surface.

[0207] The first tab 220 and the second tab 240 are the core structures participating in the electrochemical reaction in the battery device. The first tab 220 and the second tab 240 have different polarities, one of the first tab 220 and the second tab 240 is an anode tab, and the other is a cathode tab. The first tab 220 and the second tab 240 each include a main body and a tab lug connected to the main body, wherein the main body can include a current collector and an active material coated on the surface of the current collector, the main body can be in a long strip shape, the size and thickness of the main body are determined according to design requirements, and the tab lug is a metal conductor led out from the main body, the number, size and arrangement position of the tab lug are determined according to design requirements.

[0208] The first separator 210 and the second separator 230 are high-molecular thin films with a microporous structure, which are used to isolate the first tab 220 and the second tab 240 in the electrode assembly to prevent the first tab 220 and the second tab 240 from directly contacting and causing a short circuit. The first separator 210 and the second separator 230 can be in a long strip shape, and the size and thickness of the first separator 210 and the second separator 230 are determined according to design requirements. The first separator 210 includes two opposite surfaces in the thickness direction thereof, one of which is defined as a first surface, and the first surface is used for attaching the first tab 220; the second separator 230 includes two opposite surfaces in the thickness direction thereof, one of which is defined as a second surface, and the second surface is used to be opposite to the first surface.

[0209] The first separator 210, the first tab 220, the second separator 230, and the second tab 240 can be wound in a specific manner to form an electrode assembly.

[0210] S20, glue is applied to at least one side edge of the first surface to form an edge sealing area 211 on the first surface.

[0211] The glue application method includes but is not limited to spraying, scraping, and the like. The glue application can be continuous glue application, which means that the glue is applied continuously along the edge of the first surface to form a continuous glue line; or the glue application can be intermittent glue application, which means that the glue is applied intermittently along the edge of the first surface according to a certain interval rule to form a point-shaped or line-shaped glue segment distributed at intervals.

[0212] The first separator 210 has two opposite sides in the width direction X, wherein the width direction X is perpendicular to the conveying direction of the first separator 210. The above-mentioned "gluing at least one side edge of the first surface" includes gluing at both side edges of the first surface, and gluing at any one 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.

[0213] The edge sealing area 211 refers to the portion of the first surface on which glue is applied.

[0214] S30, the first separator 210, the first tab 220, the second separator 230, and the second tab 240 are pressed to form a laminated sheet body 250, and the edge sealing area 211 is bonded to the second separator 230.

[0215] The pressing refers to sequentially stacking the first separator 210, the first tab 220, the second separator 230, and the second tab 240, and tightly adhering the first separator 210, the first tab 220, the second separator 230, and the second tab 240 together by applying pressure. The pressing includes pressing the entire separator and tab, and can also include pressing the side edges of the separator and tab, and when the side edges of the separator and tab are pressed, the pressing area should cover the edge sealing area 211.

[0216] The size of the separator is generally larger than that of the electrode sheet. After the pressing, the two side edges of the first separator 210 and the second separator 230 are directly in contact. At the position where the edge sealing area 211 is formed, the first separator 210 and the second separator 230 can be fixed by adhesive bonding.

[0217] S40, winding the laminated sheet body 250 to form an electrode assembly.

[0218] Winding refers to winding the laminated sheet body 250 in a certain direction. By using different winding mechanisms 40, electrode assemblies of different shapes can be formed, including but not limited to cylindrical electrode assemblies, prismatic electrode assemblies, and the like.

[0219] Alternatively, the first electrode sheet 220 can be an anode sheet, and the second electrode sheet 240 can be a cathode sheet. In the formed electrode assembly, the length of the anode sheet is greater than that of the cathode sheet, so that the anode sheet can wrap the cathode sheet.

[0220] The winding method provided in the embodiments of the present application further includes a gluing step and a pressing step before the winding step. The gluing step includes gluing the edges of at least one side of the first surface to form an edge sealing area 211. The pressing step includes pressing the first separator 210, the first electrode sheet 220, the second separator 230, and the second electrode sheet 240 to form a laminated sheet body 250, and bonding the edge sealing area 211 of the first separator 210 to the second separator 230. In this way, by bonding at least one side of the first separator 210 and the second separator 230, the stability of the fit of the first separator 210 and the second separator 230 can be improved, so that the positions of the first separator 210 and the second separator 230 can remain relatively stable during winding, effectively reducing the risk of displacement of the first separator 210 and the second separator 230 or folding of the edges of the separators due to lack of fixation. At the same time, when auxiliary winding is performed using a vacuum winding needle or the like, the vacuum winding needle can adsorb the entire laminated sheet body 250, avoiding the problem of folding or slipping of the inner and outer separators due to insufficient adsorption force. Therefore, by using the winding method, the product quality and yield of the electrode assembly can be effectively improved, and an electrode assembly and a battery device with higher reliability can be produced.

[0221] In some embodiments, the step S20 includes gluing the edges of the opposite sides of the first surface to form edge sealing areas 211 on the two side edges of the first surface.

[0222] The two edge sealing areas 211 are arranged at intervals along the width direction X of the first separator 210, and the part between the two edge sealing areas 211 is used to fit the first electrode sheet 220.

[0223] With the above design, the edge sealing area 211 can be formed on both sides of the first surface, and after subsequent pressing treatment, the two 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 the layers, thereby ensuring that the diaphragm is not easy to displace during winding and the two side edges are not folded.

[0224] In addition, in some cases, the first pole piece 220 is an anode piece, and the second pole piece 240 is a cathode piece. The anode piece may have a lithium precipitation problem during long-term use, causing lithium ions to deposit on the surface of the first pole piece 220. In the above design, the first diaphragm 210 and the second diaphragm 230 are pressed on the opposite sides of the first pole piece 220, and the two side edges are bonded and sealed, which can create a relatively sealed environment for the first pole piece 220, thereby reducing the contact of lithium ions on the surface of the first pole piece 220 with external air, moisture or other impurities. This is also conducive to enhancing the safety of the electrode assembly.

[0225] It can be understood that in other embodiments, the second diaphragm 230 includes a second surface, and before pressing the diaphragm and the pole piece, glue can be applied to the second surface to form an edge sealing area 211, thereby achieving the bonding and fixing of the side edges 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 edge sealing area 211 formed by the second surface and the edge sealing area 211 formed by the first surface can be relative or staggered.

[0226] Please refer to Figure 2 and Figure 6 In some embodiments, the first pole piece 220 includes a first tab 222, and step S20 includes intermittently applying glue to the edge of the side of the first surface for bonding the first tab 222 to form an edge sealing area 211 with an empty space 212.

[0227] The first pole piece 220 includes a first main body 221 and a first tab 222 disposed on one side of the first main body 221. After the first pole piece 220 is bonded to the first diaphragm 210, the part of the first tab 222 connected to the first main body 221 is bonded to the first surface, and the part away from the first main body 221 protrudes from the first surface. The glue application position avoids the part for bonding the first tab 222.

[0228] In the above design, by reserving the empty space 212, the glue can be prevented from being bonded to the first tab 222, thereby preventing the glue from polluting or interfering with the first tab 222, and ensuring that the first tab 222 can maintain good electrical effect.

[0229] It can be understood 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.

[0230] In some embodiments, along the length direction Y of the first diaphragm 210, the length of the first lug 222 is l1, and the length of the avoidance position 212 is l2, l1+6.5mm≤l2≤l1+10.5mm.

[0231] The length of the avoidance position 212 is expanded by 6.5mm-10.5mm compared to the length of the first lug 222, and when the first lug 222 is arranged at the center of the avoidance position 212, the spacing between the edge sealing area 211 and the first lug 222 is 3.25mm-5.25mm.

[0232] On the one hand, errors may exist in the process of pressing the first diaphragm 210 and the first pole piece 220, and by making the size of the avoidance position 212 larger than the size of the first lug 222, a tolerance space can be provided to accept these assembly errors, further reducing the risk of glue adhering to the first lug 222; on the other hand, the above-mentioned avoidance position 212 size design is reasonable, which can not only provide reliable safety margin, but also avoid the avoidance position 212 being designed too large to affect the bonding effect of the first pole piece 220 and the first diaphragm 210.

[0233] In some embodiments, along the width direction X of the first diaphragm 210, the width of the edge sealing area 211 is w, 0.1mm≤w≤0.3mm.

[0234] For example, the width of the edge sealing area 211 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm.

[0235] The width of the edge sealing area 211 is also the width of the glue coating. The greater the width of the edge sealing area 211, the greater the amount of glue and the bonding area provided, and the stronger the bonding force generated.

[0236] In the above design, the size of the edge sealing area 211 is reasonable, which can provide sufficient bonding area in the width direction X to fix the first diaphragm 210 and the second diaphragm 230, and also avoids unnecessary material waste caused by the edge sealing area 211 occupying too much space.

[0237] It can be understood that in other embodiments, the width of the edge sealing area 211 can also be designed as 0.4mm, 0.5mm, 0.6mm, or even larger sizes.

[0238] In some embodiments, the first tab 220 comprises a first body portion 221, and the first surface has a patch area for abutting the first body portion 221, and the distance between the edge sealing area 211 and the patch area along the width direction X of the first diaphragm 210 is d2, 1.75 mm≤d2≤2.25 mm.

[0239] For example, the distance between the edge sealing area 211 and the patch area can be 1.75 mm, 1.85 mm, 2.0 mm, 2.1 mm, or 2.25 mm.

[0240] On the one hand, during the pressing process of the first diaphragm 210 and the first tab 220, there can be alignment errors, and by spacing the edge sealing area 211 and the patch area, a tolerance space can be provided to accept these assembly errors, thereby avoiding the glue of the edge sealing area 211 adhering to the first body portion 221 of the first tab 220; on the other hand, the distance 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 space waste and material waste due to too large distance between the two.

[0241] In some embodiments, before step S30, the winding method further comprises: pressing the first diaphragm 210 and the first tab 220 to form a first composite sheet 260.

[0242] Specifically, the first tab 220 comprises a first body portion 221 and a first tab 222, and the first surface of the first diaphragm 210 has a patch area, and during pressing, the first diaphragm 210 and the first tab 220 need to be stacked, with the first tab 220 facing the first surface, and after aligning the first body portion 221 with the patch area, the first diaphragm 210 and the first tab 220 are pressed, so that the first tab 220 is tightly attached to the first diaphragm 210 to form the first composite sheet 260.

[0243] In the first composite sheet 260, the first tab 222 protrudes from one side edge of the first diaphragm 210 in the width direction X.

[0244] On the one hand, the first tab 220 and the first diaphragm 210 are pressed in advance, which can improve the alignment accuracy between the two; on the other hand, the first composite sheet 260 formed by pressing the first tab 220 and the first diaphragm 210 has higher mechanical strength, which is also conducive to reducing the risk of displacement or folding of the first tab 220 and the first diaphragm 210 during the subsequent pressing process of the stacked sheet 250.

[0245] In some embodiments, before pressing the first diaphragm 210 and the first tab 220 to form the first composite sheet 260, the winding method further comprises: cutting the first tab 220 with a cam cutter.

[0246] The first tab 220 is supplied in a continuous roll, and thus the first tab 220 needs to be cut in the length direction Y of the first tab 220 according to a predetermined size during the manufacturing process to prepare an electrode assembly meeting the requirements. The length of the first tab 220 and the specific cutting position need to be determined according to the design requirements of the electrode assembly and the winding method.

[0247] It can be understood that the first tab 220 is cut and combined with the first separator 210 to form a first composite sheet 260. The first separator 210 is a continuous structure and can carry the first tab 220 together into the subsequent station.

[0248] In the above design, on the one hand, the length of the first separator 210 in the electrode assembly usually needs to be greater than the length of the first tab 220. The first tab 220 is cut before being combined with the first separator 210, which is less difficult to operate and easy to accurately control the cutting length of the first tab 220. On the other hand, the cam cutter can periodically perform cutting action during the transmission of the first tab 220, and the cutting period can be set according to the preset length of the first tab 220 and the transmission line speed. The use of the cam cutter to cut the first tab 220 can reduce the occurrence of deceleration or shutdown of the winding equipment 100, thereby facilitating the improvement of the manufacturing efficiency of the electrode assembly.

[0249] It can be understood that in some other embodiments, the first tab 220 can also be cut by using a linear cutter, a laser cutter, etc. that reciprocate along a straight line.

[0250] In some embodiments, after the first tab 220 is cut by the cam cutter, the winding method further includes conveying the first tab 220 by using a vacuum suction conveying belt.

[0251] For example, the vacuum suction conveying belt includes a conveying belt, the surface of the conveying belt is provided with suction holes, the vacuum suction conveying belt is connected to a vacuum pump, and under the action of the vacuum pump, the suction holes can suction the first tab 220 and fix the first tab 220 on the surface of the conveying belt. The conveying belt is also connected to a driving device, and the conveying belt can drive the first tab 220 to advance during rotation.

[0252] On the one hand, after the first tab 220 is cut, the leading end and the trailing end of the first tab 220 are not easy to fix, and the use of the vacuum suction conveying belt can stably suction and convey the first tab 220. The first tab 220 is not easy to be warped, displaced or slipped during the conveying process, and will not cause pressure damage to the first tab 220, and the reliability is higher. On the other hand, in addition to being able to suction the first tab 220, the vacuum suction conveying belt can also suction impurities such as debris and dust, thereby reducing the negative effects of impurities on the first tab 220 and the processing environment.

[0253] In some embodiments, the conveying speed of the vacuum suction conveying belt matches the winding speed of the winding mechanism 40, so that the winding device 100 can work without deceleration or stop.

[0254] The conveying speed of the vacuum suction conveying belt refers to the length of the first pole piece 220 that can be conveyed by the vacuum conveying belt per unit time; the winding speed of the winding mechanism 40 refers to the length of the laminated sheet body 250 that can be wound by the winding mechanism 40 per unit time.

[0255] The conveying speed of the vacuum suction conveying belt matches the winding speed of the winding mechanism 40, which can reduce the occurrence of deceleration or stop of the winding device 100, and can ensure that the tension of the first pole piece 220 is kept within a reasonable range, thereby avoiding deformation of the first pole piece 220 due to excessive tension.

[0256] It can be understood that in other embodiments, the first pole piece 220 can also be conveyed by using conveying rollers and clamping conveying devices. In some embodiments, before step S30, the winding method further comprises: pressing the second diaphragm 230 and the second pole piece 240 to form a second laminated sheet body 270.

[0257] Specifically, the second pole piece 240 includes a second main body part and a second tab, and the second surface of the second diaphragm 230 has a patch area. When pressing, the second diaphragm 230 and the second pole piece 240 need to be stacked, with the second pole piece 240 facing the second surface, and after the second main body part is aligned with the patch area, pressure is applied to the second diaphragm 230 and the second pole piece 240, so that the second pole piece 240 is tightly attached to the second diaphragm 230 to form the second laminated sheet body 270.

[0258] In the second laminated sheet body 270, the second tab protrudes from one side edge of the second diaphragm 230 in the width direction X.

[0259] On the one hand, pre-pressing the second pole piece 240 and the second diaphragm 230 can ensure the alignment accuracy between them; on the other hand, the second laminated sheet body 270 formed by pressing the second pole piece 240 and the second diaphragm 230 has higher mechanical strength, which is also conducive to reducing the risk of displacement or folding of the second pole piece 240 and the second diaphragm 230 during subsequent pressing of the laminated sheet body 250.

[0260] In some embodiments, before pressing the second diaphragm 230 and the second pole piece 240 to form the second laminated sheet body 270, the winding method further comprises: cutting the second pole piece 240 by using a cutter; and after pressing the second diaphragm 230 and the second pole piece 240 to form the second laminated sheet body 270, the winding method further comprises: gluing the first end and / or the tail end of the second laminated sheet body 270 to fix the second pole piece 240 and the second diaphragm 230.

[0261] The second tab 240 is supplied in a continuous roll, and thus the second tab 240 needs to be cut to a predetermined size in the length direction Y of the second tab 240 during manufacturing to produce an electrode assembly that meets the requirements. The length of the second tab 240 and the specific cutting position need to be determined according to the design requirements of the electrode assembly and the winding method.

[0262] The adhesive tape includes a fixing structure such as an adhesive tape or a gummed paper attached to at least one of the leading end and the trailing end of the second tab 240.

[0263] It can be understood that the second tab 240 is cut and then combined with the second separator 230 to form a second composite sheet 270, and the second separator 230 is a continuous structure that can carry the cut second tab 240 to a subsequent station.

[0264] In the above design, on the one hand, in the electrode assembly, the length of the second separator 230 generally needs to be greater than the length of the second tab 240, and the second tab 240 is cut before being combined with the second separator 230, which is less difficult to operate and easy to accurately control the cutting length of the second tab 240; on the other hand, by attaching the adhesive tape to at least one of the leading end and the trailing end of the second tab 240, the leading end or the trailing end of the second tab 240 is fixedly bonded to the second separator 230, which can effectively improve the close fit of the second tab 240 and the second separator 230, and ensure that the second composite sheet 270 is not easily separated during transmission and winding. Based on this, the second composite sheet 270 can also be long-line transported.

[0265] In some embodiments, after the second separator 230 and the second tab 240 are pressed to form the second composite sheet 270, the winding method further includes buffering the second composite sheet 270.

[0266] Optionally, in a specific embodiment, before the second separator 230 and the second tab 240 are pressed, the winding method includes cutting the second tab 240, and after the second separator 230 and the second tab 240 are pressed, the winding method includes attaching an adhesive tape to the leading end and / or the trailing end of the second tab 240 and buffering the second composite sheet 270. Specifically, the second composite sheet 270 can be temporarily stored by using a buffering structure such as a fixed roller 731 and a floating roller 732.

[0267] By temporarily storing the second composite sheet 270, the negative impact of the cutting step of the second tab 240 on the supply can be reduced. In actual manufacturing, the buffering length of the second composite sheet 270 can be adjusted according to the winding condition of the composite sheet 250 to realize continuous feeding, thereby reducing the occurrence of deceleration or shutdown of the winding equipment 100 during processing, which is conducive to improving the manufacturing efficiency of the electrode assembly.

[0268] In some embodiments, after the first diaphragm 210, the first tab 220, the second diaphragm 230 and the second tab 240 are pressed together, the interlayer gap between the contact surface of the first diaphragm 210 and the second diaphragm 230 is less than 0.15 mm.

[0269] In the above design, by reasonably limiting the interlayer gap between the contact surface of the first diaphragm 210 and the second diaphragm 230, the glue of the edge sealing area 211 can fully spread and penetrate between the first diaphragm 210 and the second diaphragm 230, so that the side edge bonding effect of the first diaphragm 210 and the second diaphragm 230 is good, and the combination is more compact.

[0270] In some embodiments, the step S40 comprises: winding the laminated sheet body 250 by using a vacuum winding needle.

[0271] The vacuum winding needle can be, but is not limited to, a cylindrical shape, a prism shape, etc., wherein the cylindrical vacuum winding needle can be used to form a cylindrical electrode assembly, and the prism-shaped vacuum winding needle can be used to form a square electrode assembly.

[0272] The vacuum winding needle can adsorb the laminated sheet body 250 by negative pressure, without the need to configure additional clamping devices, and the winding process has high stability and is not easy to damage the tabs and diaphragms, thereby facilitating the improvement of the product quality of the electrode assembly.

[0273] In some embodiments, after the laminated sheet body 250 is wound, the winding method further comprises: cutting the laminated sheet body 250 by using a cam cutter.

[0274] The first diaphragm 210 and the second diaphragm 230 are supplied in the form of continuous rolls, so after the winding is completed, the first diaphragm 210 and the second diaphragm 230 need to be cut off to prepare the required electrode assembly.

[0275] The cam cutter can periodically perform the cutting action during the winding process of the laminated sheet body 250, and the first diaphragm 210 and the second diaphragm 230 are cut off by using the cam cutter, which can reduce the occurrence of deceleration or shutdown of the winding equipment 100, thereby facilitating the improvement of the manufacturing efficiency of the electrode assembly.

[0276] In summary, the winding method provided by the embodiments 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 is bonded and fixed after being pressed together, which can effectively improve the close fit of the first diaphragm 210 and the second diaphragm 230, solve the problem that the diaphragm is prone to displacement or the edge is prone to folding during winding, and thus improve the product quality and yield of the electrode assembly; 2. By pre-pressing the first diaphragm 210 and the first tab 220, and pre-pressing the second diaphragm 230 and the second tab 240, the alignment accuracy of the diaphragm and the tab can be improved, thereby further improving the product quality of the electrode assembly; 3. By using the cam cutter to cut off the first tab 220, the first diaphragm 210 and the second diaphragm 230, and buffering the second composite sheet body 270, the feeding speed of the tab and the diaphragm can be matched with the winding speed, reducing the occurrence of deceleration or shutdown of the winding equipment 100 during winding, thereby improving the manufacturing efficiency of the electrode assembly.

[0277] The embodiment of the third aspect of the present application provides a battery manufacturing equipment, including the winding equipment 100 in the first aspect.

[0278] The battery manufacturing equipment provided by the embodiments of the present application can effectively improve the product quality and yield of the electrode assembly by using the winding equipment 100 in the first aspect, thereby improving the reliability and safety of the battery device.

[0279] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A winding apparatus characterized by comprising: include: An unwinding mechanism is used to unwind a first diaphragm, a first electrode, a second diaphragm, and a second electrode, wherein the first diaphragm has a first surface; A gluing mechanism is provided on the discharge side of the unwinding mechanism. The gluing mechanism includes two gluing components, a mounting rod, and a driving component. The gluing components are rotatably sleeved on the mounting rod. The two gluing components are spaced apart and the distance between them is adjustable. The two gluing components are used to apply glue to the edges of opposite sides of the first surface to form sealing areas on both sides of the first surface. The driving component is connected to the gluing components and is used to drive the gluing components to rotate around the mounting rod so that the gluing components move closer to or away from the first surface. A pressing mechanism is provided on the discharge side of the adhesive coating mechanism. The pressing mechanism is used to press the first diaphragm, the first electrode, the second diaphragm and the second electrode to form a stacked sheet, and to bond the sealing area to the second diaphragm. A winding mechanism is provided on the discharge side of the pressing mechanism, and the winding mechanism is used to wind the stacked sheet to form an electrode assembly.

2. The winding apparatus according to claim 1, characterized by The winding equipment further includes a first composite mechanism disposed between the adhesive coating mechanism and the pressing mechanism, the first composite mechanism being used to bond the first diaphragm and the first electrode sheet together to form a first composite sheet.

3. The winding apparatus according to claim 2, wherein The winding equipment further includes a first cutting device, which is located on the feed side of the first composite mechanism and is used to cut the first electrode sheet. The first cutting device includes a cam cutter.

4. The winding apparatus according to claim 3, wherein The winding equipment further includes a stop member, which is disposed opposite to the first cutting device and is used to support the first electrode sheet. The first cutting device is used to cut the first electrode sheet on the stop member.

5. The winding apparatus according to claim 4, wherein The abutting component is a vacuum adsorption roller.

6. The winding apparatus according to claim 3, wherein The winding equipment further includes a conveying component disposed between the first cutting device and the first composite mechanism, the conveying component being used to convey the first electrode sheet.

7. The winding apparatus according to claim 6, wherein The conveying component includes a vacuum adsorption conveyor belt.

8. The winding apparatus according to claim 1, wherein The winding equipment further includes a second composite mechanism located on the feed side of the pressing mechanism. The second composite mechanism is used to bond the second diaphragm and the second electrode sheet together to form a second composite sheet.

9. The winding apparatus according to claim 8, wherein The winding equipment further includes a second cutting device and an adhesive applicator. The second cutting device is located on the feed side of the second composite mechanism and is used to cut the second electrode sheet. The adhesive applicator is located on the discharge side of the second composite mechanism and is used to apply adhesive to the first and / or last ends of the second electrode sheet to fix the second electrode sheet and the second diaphragm.

10. The winding apparatus according to claim 8, wherein The winding equipment further includes a buffer mechanism disposed between the second composite mechanism and the pressing mechanism, the buffer mechanism being used to buffer the second composite sheet.

11. The winding apparatus according to claim 1, wherein The winding equipment also includes a third cutting device, which is arranged adjacent to the winding mechanism and is used to cut the stacked sheet. The third cutting device includes a cam cutter.

12. The winding apparatus according to any one of claims 1 to 11, characterized in that, The coating part has a coating head with a diameter of d1, where 0.5mm≤d1≤1mm.

13. A winding method, characterized by, The electrode assembly is fabricated using the winding apparatus as described in any one of claims 1-12, the winding method comprising: A first diaphragm, a first electrode, a second diaphragm, and a second electrode are provided, wherein the first diaphragm has a first surface; Adhesive is applied to the edges on opposite sides of the first surface to form sealing areas on both sides of the first surface, wherein the first electrode includes a first tab, adhesive is applied intermittently to the edge of the first surface for attaching the first tab to form the sealing area with clearance, and adhesive is applied continuously to the edge of the first surface away from the first tab to form the sealing area with a continuous adhesive line. The first diaphragm, the first electrode, the second diaphragm, and the second electrode are pressed together to form a laminated sheet, and the sealing area is bonded to the second diaphragm. The laminated sheet is wound to form an electrode assembly.

14. The winding method according to claim 13, wherein Along the length of the first diaphragm, the length of the first tab is l1, the length of the clearance is l2, and l1+6.5mm≤l2≤l1+10.5mm.

15. The winding method according to claim 13, wherein Along the width direction of the first diaphragm, the width of the sealing area is w, 0.1mm≤w≤0.3mm.

16. The winding method according to claim 13, wherein The first electrode includes a first main body portion, and the first surface has a patch area for attaching the first main body portion. Along the width direction of the first diaphragm, the distance between the sealing area and the patch area is d2, where 1.75mm≤d2≤2.25mm.

17. The winding method according to any one of claims 13 to 16, characterized in that, Before pressing the first diaphragm, the first electrode, the second diaphragm, and the second electrode, the winding method further includes pressing the first diaphragm and the first electrode to form a first composite sheet.

18. The winding method according to claim 17, wherein Before pressing the first diaphragm and the first electrode sheet to form the first composite sheet, the winding method further includes cutting the first electrode sheet using a cam cutter.

19. The winding method according to claim 18, wherein After cutting the first electrode sheet using a cam cutter, the winding method further includes: conveying the first electrode sheet using a vacuum adsorption conveyor belt.

20. The winding method according to any one of claims 13 to 16, characterized in that, Before pressing the first diaphragm, the first electrode, the second diaphragm, and the second electrode, the winding method further includes pressing the second diaphragm and the second electrode to form a second composite sheet.

21. The winding method according to claim 20, wherein Before pressing the second diaphragm and the second electrode to form the second composite sheet, the winding method further includes: cutting the second electrode with a cutter; and after pressing the second diaphragm and the second electrode to form the second composite sheet, the winding method further includes: applying adhesive to the first and / or last ends of the second composite sheet to fix the second electrode and the second diaphragm.

22. The winding method according to claim 21, wherein After pressing the second diaphragm and the second electrode to form the second composite sheet, the winding method further includes: caching the second composite sheet.

23. The winding method according to any one of claims 13-16, characterized in that, Winding the laminated sheet to form an electrode assembly includes: winding the laminated sheet using a vacuum winding needle.

24. The winding method according to any one of claims 13-16, characterized in that, After winding the composite sheet, the winding method further includes cutting the composite sheet using a cam cutter.

25. A battery manufacturing apparatus, characterized in that, Including the winding equipment as described in any one of claims 1-12.

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