Winding device and winding equipment

Abstract

The embodiment of the utility model provides a winding device and winding equipment, and relates to the technical field of winding devices, the winding device comprises a winding mechanism and a compression roller mechanism, the winding mechanism is used for winding a workpiece, the compression roller mechanism comprises a compression roller, and the compression roller is used for pressing the workpiece on the winding mechanism. Wherein the pressing roller is a one-way roller which rotates along with a workpiece in one direction when the winding mechanism winds the workpiece. According to the winding device, the pressing roller is arranged to be the one-way roller capable of rotating along with the workpiece in the one-way mode when the winding mechanism winds the workpiece, reverse rotation of the winding mechanism can be limited in the winding process of the workpiece, then the situation that the workpiece is loosened or wrinkled due to reverse rotation of the winding mechanism is reduced, and the winding efficiency is improved. And thus, the yield of subsequently obtained products is improved.

Description

Technical Field

[0001] This application relates to the field of winding device technology, and more specifically, to a winding device and winding equipment. Background Technology

[0002] Whether the workpiece can be wound flat during the winding process is an important factor affecting the yield rate. If the workpiece becomes loose or wrinkled during the winding process, the yield rate of the subsequent products will be low. Utility Model Content

[0003] This application provides a winding device and winding equipment that can obtain products with a higher yield during the workpiece winding process.

[0004] This application is achieved through the following technical solution:

[0005] In a first aspect, embodiments of this application provide a winding device, including a winding mechanism and a pressure roller mechanism. The winding mechanism is used to wind a workpiece, and the pressure roller mechanism includes a pressure roller for pressing the workpiece against the winding mechanism. The pressure roller is a unidirectional roller that rotates unidirectionally with the workpiece when the winding mechanism winds it.

[0006] In the above embodiments, by setting the pressure roller as a unidirectional roller that can rotate in one direction with the workpiece when the winding mechanism winds the workpiece, the reverse rotation of the winding mechanism can be restricted during the winding process of the workpiece, thereby reducing the loosening or wrinkling of the workpiece caused by the reverse rotation of the winding mechanism, and thus improving the yield of the subsequent products.

[0007] In some embodiments, the pressure roller mechanism further includes a central shaft and a one-way member, the pressure roller being rotatably sleeved on the outside of the central shaft, the one-way member connecting the central shaft and the pressure roller, and the one-way member being configured to enable unidirectional rotation of the pressure roller relative to the central shaft.

[0008] In the above embodiments, by setting a one-way component connecting the central shaft and the pressure roller, the pressure roller can rotate unidirectionally relative to the central shaft, thereby enabling the pressure roller to rotate unidirectionally with the workpiece when the winding mechanism winds the workpiece.

[0009] In some embodiments, the one-way component includes an inner ring and an outer ring. The inner ring is sleeved on the outside of the central shaft and circumferentially locked to the central shaft. The outer ring is rotatably sleeved on the outside of the inner ring, and the pressure roller is sleeved on the outside of the outer ring and circumferentially locked to the outer ring.

[0010] In the above embodiments, by setting the inner ring to be circumferentially locked to the central shaft and the outer ring to be circumferentially locked to the pressure roller, the outer ring can be rotatably fitted on the outside of the inner ring, so that the pressure roller can rotate unidirectionally relative to the central shaft, thereby enabling the pressure roller to rotate unidirectionally with the workpiece when the winding mechanism winds the workpiece.

[0011] In some embodiments, one of the inner ring and the central shaft is provided with a first locking protrusion, and the other is provided with a first locking groove. The first locking protrusion engages within the first locking groove to circumferentially lock the inner ring and the central shaft. In the above embodiments, circumferential locking of the inner ring and the central shaft is achieved by correspondingly providing the first locking protrusion and the first locking groove on the inner ring and the central shaft.

[0012] In some embodiments, one of the outer ring and the pressure roller is provided with a second locking protrusion, and the other is provided with a second locking groove. The second locking protrusion engages within the second locking groove to circumferentially lock the outer ring and the pressure roller. In the above embodiments, circumferential locking of the outer ring and the pressure roller is achieved by correspondingly providing a second locking protrusion and a second locking groove on the outer ring and the pressure roller.

[0013] In some embodiments, the one-way component is a one-way bearing. This arrangement enables unidirectional rotation of the pressure roller relative to the central axis, thereby reducing the possibility of the wound workpiece becoming loose or wrinkled when the pressure roller rotates in the opposite direction, thus improving the yield of the subsequent products.

[0014] In some embodiments, the winding apparatus further includes an adhesive application mechanism, which includes an adhesive application roller for applying adhesive to the surface of the workpiece. In the above embodiments, after the workpiece is wound, the adhesive layer can be adhered to the workpiece by the adhesive application roller to fix the workpiece.

[0015] In some embodiments, the pressure roller is an adhesive applicator roller for applying adhesive to the surface of the workpiece. In the above embodiments, using the adhesive applicator roller as a pressure roller during the workpiece winding process, and applying adhesive after the workpiece winding is completed, can assist in supporting the winding of the workpiece, while also reducing the investment cost of manufacturing equipment and improving overall economic efficiency.

[0016] In some embodiments, the outer peripheral surface of the adhesive roller is provided with adsorption holes. In the above embodiments, by providing adsorption holes on the outer peripheral surface of the adhesive roller, the adhesive layer can be better adsorbed onto the outer peripheral surface of the adhesive roller, thereby reducing the possibility of the adhesive layer shifting or falling off. Furthermore, during the adhesive application process, the occurrence of wrinkles in the adhesive layer can also be effectively reduced.

[0017] In some embodiments, the outer peripheral surface of the adhesive roller is provided with a plurality of adsorption holes, and the adhesive roller has a negative pressure space, with the plurality of adsorption holes communicating with the negative pressure space. In the above embodiments, by forming a negative pressure space communicating with the adsorption holes inside the adhesive roller, the adhesive layer adhered to the outer peripheral surface of the adhesive roller can be well adsorbed onto the adhesive roller, thereby reducing the occurrence of adhesive layer displacement and falling off, as well as the easy occurrence of wrinkling of the adhesive layer during the adhesive application process.

[0018] In some embodiments, the outer circumferential surface of the adhesive application roller is provided with a plurality of hole groups arranged circumferentially along the roller. Each hole group includes a plurality of adsorption holes with equal diameters. Along the rotation direction of the adhesive application roller, the diameter of the adsorption holes in the plurality of hole groups tends to increase. In the above embodiments, by providing a plurality of hole groups with increasing adsorption hole diameters, the adhesive layer can be subjected to different adsorption forces. In some specific application scenarios, the first end of the adhesive layer is covered with a hole group with a smaller diameter, and the last end is covered with a hole group with a larger diameter. This allows the adsorption force at the last end of the adhesive layer to be greater than that at the first end. The plurality of hole groups with increasing adsorption hole diameters can support the increasing adsorption force of the adhesive layer from the first end to the last end, thereby reducing wrinkling of the adhesive layer during the gradual application process.

[0019] In some embodiments, each hole group includes at least one row of adsorption holes, and each row of adsorption holes includes a plurality of adsorption holes spaced apart along the axial direction of the adhesive roller. In the above embodiments, by providing each hole group with at least one row of adsorption holes, the adsorption force on the adhesive layer disposed on the surface of the adhesive roller can have a better transition. At the same time, it can also reduce the molds used in manufacturing the adsorption holes, thereby reducing the manufacturing cost of the adhesive roller and improving its economic efficiency.

[0020] In some embodiments, the number of adsorption holes in each row of multiple hole groups is equal. This arrangement allows for better control of the adsorption force provided by the adhesive roller through the adsorption holes.

[0021] In some embodiments, the number of rows of adsorption holes in the multiple hole groups is equal. This arrangement allows for a better transition in the adsorption force experienced by the adhesive layer on the surface of the adhesive roller. Simultaneously, it reduces the number of molds used in manufacturing the adsorption holes, thereby lowering the manufacturing cost of the adhesive roller and improving its economic efficiency.

[0022] In some embodiments, a separator is provided within the negative pressure space, dividing the negative pressure space into a first space and multiple second spaces. The multiple second spaces are arranged around the first space, and each second space is connected to at least one adsorption hole. The separator includes multiple partitions connected end-to-end, each partition corresponding to a second space, and each partition has a through hole connecting the first space and the second space. In the above embodiments, by providing a separator to divide the negative pressure space into a first space and multiple second spaces, and by connecting each second space to at least one adsorption hole, the influence of the environment of the first space on the generated adsorption force can be reduced, thereby making the adsorption force on the surface of the pressure roller through the adsorption hole more stable.

[0023] In some embodiments, the cross-section of the separator is arc-shaped, perpendicular to the axial direction of the adhesive roller. Along the arc-shaped extension direction, the separator has two ends, with the middle portion closer to the rotation axis of the adhesive roller than the two ends. The separator is provided with multiple second hole groups, each including multiple through holes of the same diameter. The diameter of the multiple second hole groups increases from the middle to both ends of the separator. In the above embodiments, by providing multiple second hole groups on the separator, each including multiple through holes of the same diameter, and the diameter of the multiple second hole groups increasing from the middle to both ends of the separator, the suction force transmitted to the inner surface of the pressure roller by the generated negative pressure can be more uniform. In some examples, the inlet of the negative pressure generator is located within the first space and at the axis of the pressure roller. In this case, the cross-section is arc-shaped, and the middle portion of the separator is closer to the rotation axis of the adhesive roller than the two ends, making the suction force transmitted to the inner surface of the pressure roller by the generated negative pressure more uniform.

[0024] Secondly, embodiments of this application provide a winding apparatus, including a first unwinding mechanism, a second unwinding mechanism, and a third unwinding mechanism, and also includes a winding device provided in any one of the embodiments of the first aspect. The first unwinding mechanism is used to unwind a first electrode sheet; the second unwinding mechanism is used to unwind a separator film; the third unwinding mechanism is used to unwind a second electrode sheet; and the winding device is used to wind the first electrode sheet, the separator film, and the second electrode sheet to form an electrode assembly.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a winding device according to some embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a winding device according to some embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the structure of the pressure roller mechanism in some embodiments of this application;

[0030] Figure 4 This is a cross-sectional view of the pressure roller mechanism of some embodiments of this application;

[0031] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0032] Figure 6 This is a schematic diagram of the winding apparatus according to other embodiments of this application;

[0033] Figure 7 This is a schematic diagram of the structure of a winding device according to some embodiments of this application;

[0034] Figure 8 This is a schematic diagram of the structure of the adhesive roller in some embodiments of this application;

[0035] Figure 9 This is a cross-sectional view of the adhesive roller according to some embodiments of this application;

[0036] Figure 10 This is a schematic diagram of the flat structure of the adhesive roller according to some embodiments of this application;

[0037] Figure 11 This is a cross-sectional view of the adhesive roller according to other embodiments of this application;

[0038] Figure 12 This is a schematic diagram of the tiled structure of the partition in some embodiments of this application.

[0039] icon:

[0040] 100-First unwinding mechanism; 200-Second unwinding mechanism; 300-Third unwinding mechanism; 400-Winding device; 10-Winding mechanism; 20-Workpiece; 30-Pressure roller mechanism; 301-Pressure roller; 3011-Second locking protrusion; 302-Central shaft; 3021-First locking protrusion; 303-One-way component; 3031-Inner ring; 3032-Outer ring; 3033-First locking groove; 3034-Second locking groove; 40-Adhesive application mechanism; 401-Adhesive application roller; 4011-Adsorption hole; 4012-Negative pressure space; 40121-First space; 40122-Second space; 50-Separator; 501-Separation part; 5011-Through hole; X-Rotation direction. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0043] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0047] In this application, "multiple" means two or more (including two).

[0048] A winding device typically includes a winding mechanism and a pressure roller mechanism. The pressure roller structure may include a pressure roller. The winding mechanism can be used to wind the workpiece, and the pressure roller can be used to press the workpiece against the winding mechanism for tensioning or rolling treatment, thereby reducing the loosening or wrinkling of the workpiece during the winding process.

[0049] During the winding process, the winding mechanism may reverse. This reversal will cause the pressure roller to reverse as well. The reversal of the pressure roller will cause the workpiece in contact with the pressure roller to become loose or wrinkled, which will reduce the yield of the subsequent products.

[0050] Taking the winding process of electrode assembly as an example, the electrode assembly is an important component of the battery cell. The electrode assembly includes stacked structure and wound structure. In the wound structure, the electrode assembly is generally made of positive electrode sheet, negative electrode sheet and separator. The separator is sandwiched between the positive electrode sheet and the negative electrode sheet to prevent the positive electrode sheet and the negative electrode sheet from directly contacting each other and causing a short circuit.

[0051] In the electrode assembly fabrication line, roller assemblies can be used to tension or roll the electrode strip. The electrode strip includes a positive electrode, a negative electrode, and a separator. After winding, the electrode strip becomes a wound electrode assembly. In the fabrication of wound batteries, the electrode strip needs to be wound to form the electrode assembly. This winding action can be achieved through a winding mechanism. However, if the winding mechanism alone completes the winding of the electrode strip, the strip may not be tightly pressed together. Therefore, pressure rollers are needed. During the winding process, the pressure rollers press the electrode strip firmly against the winding mechanism, ensuring a tighter bond.

[0052] When using pressure rollers, the winding mechanism may reverse. This reversal will cause the pressure roller to reverse as well. The reversal of the pressure roller will cause the electrode strip in contact with the pressure roller to loosen or wrinkle, which will reduce the yield of the resulting battery cells.

[0053] In view of this, this application provides a winding device, including a winding mechanism and a pressure roller mechanism. The winding mechanism is used to wind a workpiece, and the pressure roller mechanism includes a pressure roller for pressing the workpiece against the winding mechanism. The pressure roller is a unidirectional roller that rotates unidirectionally with the workpiece when the winding mechanism winds it.

[0054] When using such a winding device, by setting the pressure roller as a unidirectional roller that can rotate in one direction with the workpiece when the winding mechanism winds the workpiece, the reverse rotation of the winding mechanism can be restricted during the winding process, thereby reducing the loosening or wrinkling of the workpiece caused by the reverse rotation of the winding mechanism, and thus improving the yield of the subsequent products.

[0055] The technical solutions described in the embodiments of this application are all applicable to winding equipment for winding electrode assemblies.

[0056] Please see Figure 1 , Figure 1The diagram below shows the structure of a winding device according to some embodiments of this application. The winding device includes a first unwinding mechanism 100, a second unwinding mechanism 200, a third unwinding mechanism 300, and a winding device 400. The first unwinding mechanism 100 is used to unwind a first electrode sheet, the second unwinding mechanism 200 is used to unwind a separator film, the third unwinding mechanism 300 is used to unwind a second electrode sheet, and the winding device 400 is used to wind the first electrode sheet, the separator film, and the second electrode sheet to form an electrode assembly.

[0057] The first electrode, the separator, and the second electrode are stacked and wound together to obtain an electrode assembly, in which one of the first electrode and the other is the positive electrode and the other is the negative electrode.

[0058] The separator can be any well-known porous structure separator with good chemical and mechanical stability.

[0059] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different.

[0060] The first electrode, the separator, and the second electrode can form a stacked structure between windings or during the winding process.

[0061] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the winding device 400 according to some embodiments of this application; Figure 3 This is a schematic diagram of the structure of the pressure roller mechanism 30 in some embodiments of this application. This application provides a winding device 400, including a winding mechanism 10 and a pressure roller mechanism 30. The winding mechanism 10 is used to wind a workpiece 20, and the pressure roller mechanism 30 includes a pressure roller 301, which is used to press the workpiece 20 against the winding mechanism 10. The pressure roller 301 is a unidirectional roller that rotates unidirectionally with the workpiece 20 when the winding mechanism 10 winds the workpiece 20.

[0062] The pressure roller mechanism 30 includes a pressure roller 301, which can be driven to move toward or away from the winding mechanism 10 with the assistance of a drive assembly. During its movement toward the winding mechanism 10, the pressure roller 301 gradually contacts the workpiece 20 and gradually presses it against the winding mechanism 10, resulting in a tighter winding of the workpiece 20. As the pressure roller 301 contacts and presses the workpiece 20 against the winding mechanism 10, the distance between the pressure roller 301 and the winding mechanism 10 gradually increases with the increase in the winding thickness of the workpiece 20, thereby reducing the impact of the pressure roller 301 on the workpiece 20. For example, a cylinder can be used to drive the pressure roller 301 to move toward or away from the winding mechanism 10.

[0063] The pressure roller 301 can be made of metallic materials, such as copper, aluminum, or steel; it can also be made of non-metallic materials, such as plastic or rubber. The pressure roller 301 can be made of either hard or soft materials. The pressure roller 301 can directly contact the workpiece 20 through its outer peripheral surface to complete the rolling action. Alternatively, a protective element can be provided on the outer peripheral surface of the pressure roller 301, allowing it to contact the workpiece 20 and complete the rolling action. For example, a soft rubber sleeve can be provided on the surface of the pressure roller 301, allowing it to contact the workpiece 20, thereby reducing hard contact between the pressure roller 301 and the workpiece 20 and improving the protection performance of the workpiece 20.

[0064] Rollers can be categorized into different types based on their functions. For example, a roller that presses the workpiece 20 by applying pressure can be called a pressure roller 301. Another type of roller can be used to apply adhesive to the workpiece 20; this type of roller can be called an adhesive application roller 401.

[0065] The winding mechanism 10 maintains a rotating motion during the winding process, and the pressure roller 301 rotates itself after contacting the workpiece 20.

[0066] A unidirectional roller can only rotate in one direction and not in the opposite direction. The unidirectional roller can support its unidirectional rotation along with the workpiece 20 when the winding mechanism 10 winds the workpiece 20. Figure 2 For example, when the winding mechanism 10 rotates counterclockwise to wind the workpiece 20, the pressure roller 301 contacts the workpiece 20 and rotates with it. The rotation direction X of the pressure roller 301 is the clockwise direction. When the winding mechanism 10 reverses, that is, when the winding mechanism 10 changes from counterclockwise rotation to clockwise rotation, because the pressure roller 301 is a one-way roller, it cannot change from clockwise rotation to counterclockwise rotation under the drive of the winding mechanism 10.

[0067] In the above embodiment, by setting the pressure roller 301 as a unidirectional roller that can rotate in one direction with the workpiece 20 when the winding mechanism 10 winds the workpiece 20, the reverse rotation of the winding mechanism 10 can be restricted during the winding process of the workpiece 20, thereby reducing the loosening or wrinkling of the workpiece 20 caused by the reverse rotation of the winding mechanism 10, and thus improving the yield of the subsequent products.

[0068] In some embodiments, see still Figure 3 The pressure roller mechanism 30 also includes a central shaft 302 and a one-way component 303. The pressure roller 301 is rotatably sleeved on the outside of the central shaft 302. The one-way component 303 connects the central shaft 302 and the pressure roller 301. The one-way component 303 is configured to enable the pressure roller 301 to rotate unidirectionally relative to the central shaft 302.

[0069] The central shaft 302 is located at the rotation center of the pressure roller 301. The pressure roller 301 is rotatably sleeved on the outside of the central shaft 302, so that the pressure roller 301 can rotate relative to the central shaft 302 to complete the rolling action of the pressure roller 301. The pressure roller 301 can be in direct contact with the central shaft 302 or indirect contact with the central shaft 302. For example, the pressure roller 301 can be connected to the central shaft 302 through a one-way member 303.

[0070] The one-way component 303 is a component used to enable the pressure roller 301 to rotate unidirectionally with the workpiece 20 when the winding mechanism 10 winds the workpiece 20. For example, the one-way component 303 may be a one-way bearing, ratchet, Geneva wheel, incomplete gear mechanism, etc.

[0071] In the above embodiment, by setting a one-way component 303 connecting the central shaft 302 and the pressure roller 301, the pressure roller 301 can rotate unidirectionally relative to the central shaft 302, thereby enabling the pressure roller 301 to rotate unidirectionally with the workpiece 20 when the winding mechanism 10 winds the workpiece 20.

[0072] In some embodiments, please refer to Figure 4 and Figure 5 , Figure 4 This is a cross-sectional view of the pressure roller mechanism 30 of some embodiments of this application; Figure 5 for Figure 4 A partial enlarged view at point A. The unidirectional component 303 includes an inner ring 3031 and an outer ring 3032. The inner ring 3031 is sleeved on the outside of the central shaft 302 and is circumferentially locked to the central shaft 302. The outer ring 3032 is rotatably sleeved on the outside of the inner ring 3031. The pressure roller 301 is sleeved on the outside of the outer ring 3032 and is circumferentially locked to the outer ring 3032.

[0073] The inner ring 3031 is circumferentially locked to the central shaft 302, preventing relative rotation between them. The outer ring 3032 is circumferentially locked to the pressure roller 301, preventing relative rotation between them. The outer ring 3032 is unidirectionally rotatable around the outer side of the inner ring 3031, allowing rotation relative to the inner ring 3031, but only in one direction. For example, a one-way bearing may have an outer ring 3032 structure that allows rotation relative to the inner ring 3031.

[0074] Locking can be achieved through an interference fit, such as an interference fit between the inner ring 3031 and the central shaft 302. Locking can also be achieved through a limiting component. For example, a limiting groove can be provided on the first object to be locked, and a limiting protrusion can be provided on the second object to be locked. Locking is achieved through the engagement of the limiting groove and the limiting protrusion. For instance, the inner ring 3031 is fitted onto the outside of the central shaft 302. A limiting groove can be provided on the inner side of the inner ring 3031 or the outer side of the central shaft 302, and a limiting protrusion can be provided on the other. When the limiting protrusion is located in the limiting groove, it can prevent relative rotation between the inner ring 3031 and the central shaft 302, thereby achieving the axial locking function between the inner ring 3031 and the central shaft 302.

[0075] The outer ring 3032 is rotatably fitted on the outside of the inner ring 3031 and can be made of one-way bearings, ratchet, grooved wheel, incomplete gear mechanism, etc.

[0076] In the above embodiment, by setting the inner ring 3031 to be circumferentially locked to the central shaft 302 and the outer ring 3032 to be circumferentially locked to the pressure roller 301, the outer ring 3032 can be unidirectionally rotatably sleeved on the outside of the inner ring 3031, so that the pressure roller 301 can rotate unidirectionally relative to the central shaft 302, thereby enabling the pressure roller 301 to follow the workpiece 20 in unidirectional rotation when the winding mechanism 10 winds the workpiece 20.

[0077] In some embodiments, see still Figure 5 One of the inner ring 3031 and the central shaft 302 is provided with a first locking protrusion 3021, and the other is provided with a first locking groove 3033. The first locking protrusion 3021 is locked in the first locking groove 3033 to circumferentially lock the inner ring 3031 and the central shaft 302.

[0078] The first locking protrusion 3021 is engaged within the first locking groove 3033 to circumferentially lock the inner ring 3031 and the central shaft 302, preventing them from rotating relative to each other. The first locking protrusion 3021 can be located on the inner side of the inner ring 3031, in which case the first locking groove 3033 is located on the outer side of the central shaft 302; alternatively, the first locking protrusion 3021 can be located on the outer side of the central shaft 302, in which case the first locking groove 3033 is located on the inner side of the inner ring 3031. Figure 5 As shown in the example, the first cam 3021 is located on the outside of the central shaft 302, and the first slot 3033 is located on the inside of the inner ring 3031.

[0079] In the above embodiments, the inner ring 3031 and the central shaft 302 are circumferentially locked by providing a first locking protrusion 3021 and a first locking groove 3033 on the inner ring 3031 and the central shaft 302 respectively.

[0080] In some embodiments, see still Figure 5 One of the outer ring 3032 and the pressure roller 301 is provided with a second locking protrusion 3011, and the other is provided with a second locking groove 3034. The second locking protrusion 3011 is locked in the second locking groove 3034 to circumferentially lock the outer ring 3032 and the pressure roller 301.

[0081] The second locking protrusion 3011 is engaged within the second locking groove 3034 to circumferentially lock the outer ring 3032 and the pressure roller 301, preventing them from rotating relative to each other. The second locking protrusion 3011 can be located on the outer side of the outer ring 3032, in which case the second locking groove 3034 is located on the inner side of the pressure roller 301; alternatively, the second locking protrusion 3011 can be located on the inner side of the pressure roller 301, in which case the second locking groove 3034 is located on the outer side of the outer ring 3032. Figure 5 As shown in the example, the second protrusion 3011 is disposed on the inner side of the pressure roller 301, and the second groove 3034 is disposed on the outer side of the outer ring 3032.

[0082] In the above embodiment, the outer ring 3032 and the pressure roller 301 are circumferentially locked by correspondingly providing a second locking protrusion 3011 and a second locking groove 3034 on the outer ring 3032 and the pressure roller 301.

[0083] In some embodiments, the one-way component 303 is a one-way bearing. This arrangement enables the pressure roller 301 to rotate in one direction relative to the central shaft 302, thereby reducing the possibility of the wound workpiece 20 becoming loose or wrinkled when the pressure roller 301 rotates in the opposite direction, thus improving the yield of the subsequent products.

[0084] In some embodiments, please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of a winding device 400 according to other embodiments of this application. The winding device 400 also includes an adhesive application mechanism 40, which includes an adhesive application roller 401 for applying adhesive to the surface of the workpiece 20.

[0085] Taking a wound electrode assembly as an example, in the manufacturing process of a wound electrode assembly, after the electrode strip is wound, adhesive needs to be applied to the edge of the electrode strip to reduce the loosening of the electrode strip. The adhesive application action can be completed by the adhesive application mechanism 40 to reduce the loosening of the electrode strip.

[0086] The outer circumferential surface of the adhesive roller 401 can be wrapped with multiple turns of adhesive layer, which is then adhered to the workpiece 20 to fix the workpiece 20. During the adhesive application process, the required adhesive layer is adhered to the workpiece 20, and can then be cut as needed for subsequent adhesive application actions. The outer circumferential surface of the adhesive roller 401 can also adsorb an adhesive layer with an area smaller than the outer circumferential surface of the adhesive roller 401. In this case, the adhesive layer can be used for single purposes; that is, during the adhesive application action, the adhesive layer is first placed on the outer circumferential surface of the adhesive roller 401, and then the subsequent adhesive application action is completed by the adhesive roller 401.

[0087] The outer peripheral surface of the adhesive roller 401 can be a smooth surface, or it can be provided with adsorption holes 4011. The adsorption holes 4011 can enable the adhesive layer to be better adsorbed onto the outer peripheral surface of the adhesive roller 401.

[0088] The adhesive applicator roller 401 and the pressure roller 301 can be separate components, each performing the adhesive applicator action and the pressure roller action respectively. Alternatively, the adhesive applicator roller 401 and the pressure roller 301 can be a single component, meaning that one roller can perform both the adhesive applicator action and the pressure roller action.

[0089] In the above embodiment, after the workpiece 20 is wound, the adhesive layer can be pasted onto the workpiece 20 by the adhesive roller 401 to fix the workpiece 20.

[0090] In some embodiments, please refer to Figure 7 , Figure 7 This is a schematic diagram of the winding device 400 according to some embodiments of this application. The pressure roller 301 is an adhesive application roller 401 used to apply adhesive to the surface of the workpiece 20.

[0091] After the workpiece is wound, it needs to be coated with adhesive by another adhesive roller 401 to obtain a wound workpiece.

[0092] Setting up pressure roller 301 and adhesive roller 401 usually requires setting up a drive mechanism and other control components to control pressure roller 301 and adhesive roller 401.

[0093] In the above embodiment, the adhesive roller 401 is used as the pressure roller 301 in the process of winding the workpiece 20, and the adhesive is applied after the workpiece 20 is wound. This can help support the winding of the workpiece 20, and at the same time reduce the investment cost of manufacturing equipment and improve the overall economy.

[0094] In some examples, during the winding process of workpiece 20, the adhesive roller 401 does not have an adhesive layer. The adhesive roller 401 presses the workpiece 20 tightly against the winding mechanism 10 through a rolling action. After the workpiece 20 is wound, when adhesive needs to be applied to the edge of the workpiece 20, the adhesive layer is then set on the outer circumferential surface of the adhesive roller 401, and the adhesive application action of the workpiece 20 is completed.

[0095] In some embodiments, please refer to Figure 8 , Figure 8 This is a schematic diagram of the structure of an adhesive roller 401 according to some embodiments of this application. The outer peripheral surface of the adhesive roller 401 is provided with adsorption holes 4011.

[0096] One or more adsorption holes 4011 can be provided. When multiple adsorption holes 4011 are provided, the multiple adsorption holes 4011 can be provided in a part of the outer peripheral surface of the adhesive roller 401, such as only in one-third or one-half of the outer peripheral surface of the adhesive roller 401; the multiple adsorption holes 4011 can also be provided in the entire outer peripheral surface of the adhesive roller 401.

[0097] In the embodiment where the adsorption hole 4011 is provided, the inner side of the adhesive roller 401 can be hollowed out to form an airflow channel on the inner side of the adhesive roller 401. At this time, due to the provision of the airflow channel, the adsorption hole 4011 can have a certain adsorption force, thereby achieving good adsorption of the adhesive layer provided on the adhesive roller 401.

[0098] In the example where the adsorption hole 4011 is provided, a negative pressure space 4012 can also be formed on the inner side of the adhesive roller 401 so that the adhesive layer on the outer side of the adhesive roller 401 can be subjected to adsorption force and adsorbed onto the adhesive roller 401.

[0099] In some examples, to reduce the cutting action of the adhesive layer, the length of the adhesive layer added each time only needs to be used to fix the end of the workpiece 20 winding. In this case, the length of the adhesive layer used at one time may be less than the circumference of the adhesive roller 401. Since there is no overlapping area, the adhesive layer does not have tension at the opposite ends along the circumference of the adhesive roller 401. In this example, the adhesive layer is prone to displacement, falling off, or wrinkling during the application process.

[0100] Therefore, in the above embodiments, by providing adsorption holes 4011 on the outer peripheral surface of the adhesive roller 401, the adhesive layer can be better adsorbed onto the outer peripheral surface of the adhesive roller 401, thereby reducing the possibility of the adhesive layer shifting or falling off. Furthermore, during the adhesive application process, the occurrence of wrinkles in the adhesive layer can also be effectively reduced.

[0101] In some embodiments, please refer to Figure 9 , Figure 9 This is a cross-sectional view of an adhesive roller 401 according to some embodiments of this application. The outer peripheral surface of the adhesive roller 401 is provided with a plurality of adsorption holes 4011, and the adhesive roller 401 has a negative pressure space 4012, with the plurality of adsorption holes 4011 communicating with the negative pressure space 4012.

[0102] A cavity can be formed inside the adhesive applicator roller 401, creating a negative pressure space 4012 within the cavity. The negative pressure space 4012 can be formed using a negative pressure generator connected to the inner cavity of the adhesive applicator roller 401. During the operation of the adhesive applicator roller 401, the negative pressure generator remains continuously connected to the inner cavity of the adhesive applicator roller 401. Alternatively, after the adhesive applicator roller 401 has finished operating, the negative pressure generator can be connected to the adhesive applicator roller 401 to maintain the stability of the negative pressure space 4012 within the inner cavity of the adhesive applicator roller 401; during the operation of the adhesive applicator roller 401, the negative pressure generator can be disconnected from the adhesive applicator roller 401 to improve the ease of use of the adhesive applicator roller 401.

[0103] In the above embodiment, by forming a negative pressure space 4012 in the adhesive roller 401 that communicates with the adsorption hole 4011, the adhesive layer attached to the outer peripheral surface of the adhesive roller 401 can be well adsorbed onto the adhesive roller 401, thereby reducing the occurrence of adhesive layer shifting or falling off, and the occurrence of wrinkling of the adhesive layer during the adhesive application process.

[0104] In some embodiments, please refer to Figure 10 , Figure 10 This is a schematic diagram of the flat structure of the adhesive roller 401 according to some embodiments of this application. The outer peripheral surface of the adhesive roller 401 is provided with a plurality of hole groups arranged circumferentially along the adhesive roller 401. Each hole group includes a plurality of adsorption holes 4011 with equal diameter. Along the rotation direction X of the adhesive roller 401, the diameter of the adsorption holes 4011 in the plurality of hole groups tends to increase.

[0105] Multiple hole groups can be arranged in a part of the outer peripheral surface of the adhesive roller 401. Along the rotation direction X of the adhesive roller 401, the diameter of the adsorption hole 4011 in the multiple hole groups gradually increases. At this time, there is a smooth surface without adsorption holes 4011 between the hole group with the smallest diameter and the hole group with the largest diameter.

[0106] Multiple hole groups can also be arranged over the entire outer circumferential surface of the adhesive roller 401. Along the rotation direction X of the adhesive roller 401, the diameter of the adsorption holes 4011 in the multiple hole groups gradually increases. In this case, the hole group with the smallest diameter is arranged adjacent to the hole group with the largest diameter.

[0107] Depending on the required size of the adhesive layer, multiple hole groups can be set in a portion of the outer peripheral surface of the adhesive roller 401, or multiple hole groups can be set in the entire outer peripheral surface of the adhesive roller 401.

[0108] Each circumferentially arranged group of holes may include one row of adsorption holes 4011 or multiple rows of adsorption holes 4011. Different groups of holes are distinguished according to the size of the hole diameter. All adsorption holes 4011 in each group have the same diameter. Along the rotation direction X of the adhesive roller 401, the diameter of the adsorption holes 4011 in multiple groups of holes tends to increase. That is, according to the grouping, along the rotation direction X of the adhesive roller 401, the diameter of the adsorption holes 4011 in each group of holes gradually increases.

[0109] In specific application scenarios, the size of the adhesive layer covering the outer periphery of the adhesive roller 401 is smaller than the size of the outer periphery of the adhesive roller 401. In this case, the first end of the adhesive layer can be set in the area where the hole group with the smaller aperture is located, and cover the hole group; then the last end of the adhesive layer can be set in the area where the hole group with the larger aperture is located, and cover the hole group. The first end of the adhesive layer refers to the part that first detaches from the adhesive roller 401 and is pasted to the winding tail end of the workpiece 20 during the adhesive application process. The last end of the adhesive layer refers to the part that finally detaches from the adhesive roller 401 and is pasted to the winding tail end of the workpiece 20 during the adhesive application process. Since the aperture of the adsorption hole 4011 of each hole group gradually increases along the rotation direction X of the adhesive roller 401, the aperture of the hole group covered by the adhesive layer also gradually increases from the first end to the last end.

[0110] Furthermore, when the pressure roller 301 is an adhesive roller 401 used to apply adhesive to the surface of the workpiece 20, the adhesive roller 401 is a unidirectional roller, which can further correspond to the first end of the adhesive layer covering the hole group with a smaller aperture, while the tail end of the adhesive layer covers the hole group with a larger aperture.

[0111] In the above embodiments, by setting multiple groups of pores with increasing pore diameters of the adsorption pores 4011, the adhesive layer can be subjected to different adsorption forces. In some specific application scenarios, the first end of the adhesive layer is covered with a group of pores with smaller pore diameters, and the last end is covered with a group of pores with larger pore diameters. This allows the adsorption force at the last end of the adhesive layer to be greater than that at the first end. The multiple groups of pores with increasing pore diameters of the adsorption pores 4011 can support the increasing adsorption force of the adhesive layer from the first end to the last end, thereby reducing the occurrence of wrinkles in the adhesive layer during the gradual application of the adhesive.

[0112] In some embodiments, see still Figure 10 Each hole group includes at least one row of adsorption holes 4011, and each row of adsorption holes 4011 includes a plurality of adsorption holes 4011 arranged at intervals along the axial direction of the adhesive roller 401.

[0113] Each pore group may include only one row of adsorption pores 4011, or it may include at least two rows of adsorption pores 4011. When each pore group includes at least two rows of adsorption pores 4011, the multiple rows of adsorption pores 4011 in each pore group are arranged adjacent to each other and are not alternated with other pore groups.

[0114] When the adhesive roller 401 is provided with multiple hole groups, the number of rows of adsorption holes 4011 in different hole groups can be the same or different. For example, some hole groups can be provided with two rows of adsorption holes 4011, while other hole groups can be provided with two rows of adsorption holes 4011, or three rows of adsorption holes 4011, or only one row of adsorption holes 4011.

[0115] In the above embodiments, by setting each hole group to include at least one row of adsorption holes 4011, the adsorption force on the adhesive layer on the surface of the adhesive roller 401 can have a better transition. At the same time, it can also reduce the mold used when manufacturing the adsorption holes 4011, thereby reducing the manufacturing cost of the adhesive roller 401 and improving the economy of the adhesive roller 401.

[0116] In some embodiments, see still Figure 10 In multiple hole groups, the number of adsorption holes 4011 in each row is equal. This setting allows for better control of the adsorption force provided by the adhesive roller 401 through the adsorption holes 4011.

[0117] In some embodiments, see still Figure 10 In this design, the number of rows of adsorption holes 4011 in multiple hole groups is equal. This arrangement allows for a better transition in the adsorption force experienced by the adhesive layer on the surface of the adhesive roller 401. Simultaneously, it reduces the number of molds used in manufacturing the adsorption holes 4011, thereby lowering the manufacturing cost of the adhesive roller 401 and improving its economic efficiency.

[0118] In some embodiments, please refer to Figure 11 , Figure 11 This is a cross-sectional view of the adhesive roller 401 in some other embodiments of this application. A separator 50 is provided in the negative pressure space 4012, which divides the negative pressure space 4012 into a first space 40121 and a plurality of second spaces 40122. The plurality of second spaces 40122 are arranged around the first space 40121, and each second space 40122 is connected to at least one adsorption hole 4011. The separator 50 includes a plurality of partition portions 501 connected end to end, each partition portion 501 corresponding to a second space 40122. The partition portion 501 is provided with a through hole 5011, which connects the first space 40121 and the second space 40122.

[0119] When a negative pressure space 4012 is formed by a negative pressure generator, the connection port of the negative pressure generator can be located in the area of ​​the negative pressure space 4012 near the central axis 302, so that the initially formed negative pressure space 4012 is located at the position of the first space 40121, and then the suction force is transmitted to the second space 40122 through the separator 50, and then transmitted to the adsorption hole 4011 through the second space 40122.

[0120] The separator 50 divides the negative pressure space 4012, forming a first space 40121 on the inner side and a plurality of second spaces 40122 on the outer side. The plurality of second spaces 40122 are arranged around the first space 40121. The separator 50 includes a plurality of dividing parts 501, each dividing part 501 forming a second space 40122. In some specific scenarios, the two ends of the dividing parts 501 can be connected to the inner surface of the adhesive roller 401 to enclose a second space 40122.

[0121] In the above embodiment, by setting the separator 50 to divide the negative pressure space 4012 into a first space 40121 and a plurality of second spaces 40122, and connecting each second space 40122 to at least one adsorption hole 4011, the influence of the environment of the first space 40121 on the adsorption force generated can be reduced, thereby making the adsorption force on the surface of the pressure roller 301 through the adsorption hole 4011 more stable.

[0122] In some embodiments, please refer to Figure 11 And further reading Figure 12 , Figure 12 This is a schematic diagram of the flat structure of the separator 501 according to some embodiments of this application. The separator 501 has an arc-shaped cross-section, which is perpendicular to the axial direction of the adhesive roller 401. Along the extension direction of the arc, the separator 501 has two ends, and the middle part of the separator 501 is closer to the rotation axis of the adhesive roller 401 than the two ends of the separator 501. The separator 501 is provided with a plurality of second hole groups, each second hole group including a plurality of through holes 5011 with the same diameter. The diameter of the plurality of second hole groups increases from the middle part to the two ends of the separator 501.

[0123] In the above embodiments, by providing a plurality of second hole groups on the partition 501, and providing each second hole group including a plurality of through holes 5011 with the same hole diameter, the hole diameter of the plurality of second hole groups increases from the middle to both ends of the partition 501, which makes the negative pressure generated and the adsorption force transmitted to the inner surface of the pressure roller 301 more uniform. In some examples, the inlet of the negative pressure generator is provided in the first space 40121 and located at the axis of the pressure roller 301. In this case, the cross-section is set to be arc-shaped, and the middle of the partition 501 is closer to the rotation axis of the adhesive roller 401 than the two ends of the partition 501, which makes the negative pressure generated and the adsorption force transmitted to the inner surface of the pressure roller 301 more uniform.

[0124] In some embodiments of this application, a winding device 400 is provided, including a winding mechanism 10 and a pressure roller mechanism 30. The winding mechanism 10 is used to wind a workpiece 20. The pressure roller mechanism 30 includes a pressure roller 301, a central shaft 302, and a one-way component 303. The pressure roller 301 is used to press the workpiece 20 against the winding mechanism 10, and the pressure roller 301 is a one-way roller that rotates unidirectionally with the workpiece 20 when the winding mechanism 10 winds the workpiece 20. The pressure roller 301 is rotatably sleeved on the outside of the central shaft 302. The one-way component 303 includes an inner ring 3031 and an outer ring 3032. The inner ring 3031 is sleeved on the outside of the central shaft 302 and is circumferentially locked to the central shaft 302. The outer ring 3032 is rotatably sleeved on the outside of the inner ring 3031, and the pressure roller 301 is sleeved on the outside of the outer ring 3032 and is circumferentially locked to the outer ring 3032. One of the inner ring 3031 and the central shaft 302 is provided with a first locking protrusion 3021, and the other is provided with a first locking groove 3033. The first locking protrusion 3021 is engaged in the first locking groove 3033 to circumferentially lock the inner ring 3031 and the central shaft 302. One of the outer ring 3032 and the pressure roller 301 is provided with a second locking protrusion 3011, and the other is provided with a second locking groove 3034. The second locking protrusion 3011 is engaged in the second locking groove 3034 to axially lock the outer ring 3032 and the pressure roller 301. The one-way component 303 may specifically be a one-way bearing. The winding device 400 may include an adhesive application mechanism 40, which includes an adhesive application roller 401 for applying adhesive to the surface of the workpiece 20, and the pressure roller 301 is the adhesive application roller 401 for applying adhesive to the surface of the workpiece 20. The outer peripheral surface of the adhesive applicator roller 401 is provided with a plurality of adsorption holes 4011. The adhesive applicator roller 401 has a negative pressure space 4012, and the plurality of adsorption holes 4011 are connected to the negative pressure space 4012. The outer peripheral surface of the adhesive applicator roller 401 is provided with a plurality of hole groups arranged circumferentially along the adhesive applicator roller 401. Each hole group includes a plurality of adsorption holes 4011 with equal diameters. Along the rotation direction X of the adhesive applicator roller 401, the diameter of the adsorption holes 4011 in the plurality of hole groups tends to increase. Each hole group includes at least one row of adsorption holes 4011. Each row of adsorption holes 4011 includes a plurality of adsorption holes 4011 arranged at intervals along the axial direction of the adhesive applicator roller 401. The number of adsorption holes 4011 in each row of the plurality of hole groups is equal, and the number of rows of adsorption holes 4011 in the plurality of hole groups is equal. The negative pressure space 4012 is provided with a separator 50, which divides the negative pressure space 4012 into a first space 40121 and a plurality of second spaces 40122. The plurality of second spaces 40122 are arranged around the first space 40121, and each second space 40122 is connected to at least one adsorption hole 4011. The separator 50 includes a plurality of dividing parts 501 connected end to end, each dividing part 501 corresponding to a second space 40122. The dividing part 501 is provided with a through hole 5011, which connects the first space 40121 and the second space 40122.The separator 501 has an arc-shaped cross-section perpendicular to the axial direction of the adhesive roller 401. Along the arc's extension direction, the separator 501 has two ends, with the middle portion of the separator 501 closer to the rotation axis of the adhesive roller 401 than the two ends. The separator 501 is provided with multiple second hole groups, each second hole group including multiple through holes 5011 of the same diameter. The diameter of the multiple second hole groups increases from the middle to both ends of the separator 501.

[0125] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0126] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A winding device, characterized in that, include: A winding mechanism used for winding workpieces; A pressure roller mechanism includes a pressure roller for pressing the workpiece against the winding mechanism; The pressure roller is a unidirectional roller that rotates in one direction along with the workpiece when the winding mechanism winds the workpiece.

2. The winding device according to claim 1, characterized in that, The pressure roller mechanism further includes: A central shaft, on which the pressure roller is rotatably sleeved; A one-way component connects the central shaft and the pressure roller, the one-way component being configured to allow the pressure roller to rotate unidirectionally relative to the central shaft.

3. The winding device according to claim 2, characterized in that, The unidirectional component includes an inner ring and an outer ring. The inner ring is sleeved on the outside of the central shaft and circumferentially locked to the central shaft. The outer ring is rotatably sleeved on the outside of the inner ring, and the pressure roller is sleeved on the outside of the outer ring and circumferentially locked to the outer ring.

4. The winding device according to claim 3, characterized in that, One of the inner ring and the central shaft is provided with a first locking protrusion, and the other is provided with a first locking groove. The first locking protrusion is engaged in the first locking groove to circumferentially lock the inner ring and the central shaft.

5. The winding device according to claim 3, characterized in that, One of the outer ring and the pressure roller is provided with a second locking protrusion, and the other is provided with a second locking groove. The second locking protrusion is engaged in the second locking groove to circumferentially lock the outer ring and the pressure roller.

6. The winding device according to claim 2, characterized in that, The one-way component is a one-way bearing.

7. The winding device according to claim 1, characterized in that, The winding device further includes an adhesive applicator, which includes an adhesive applicator roller for applying adhesive to the surface of the workpiece.

8. The winding device according to claim 1, characterized in that, The pressure roller is an adhesive roller used to apply adhesive to the surface of the workpiece.

9. The winding apparatus according to claim 7 or 8, characterized in that, The outer circumferential surface of the adhesive roller is provided with adsorption holes.

10. The winding apparatus according to claim 9, characterized in that, The outer circumferential surface of the adhesive roller is provided with a plurality of adsorption holes, and the adhesive roller has a negative pressure space, wherein the plurality of adsorption holes are connected to the negative pressure space.

11. The winding apparatus according to claim 10, characterized in that, The outer circumferential surface of the adhesive roller is provided with a plurality of hole groups arranged along the circumference of the adhesive roller. Each hole group includes a plurality of adsorption holes with equal diameters. Along the rotation direction of the adhesive roller, the diameter of the adsorption holes in the plurality of hole groups tends to increase.

12. The winding apparatus according to claim 11, characterized in that, Each of the hole groups includes at least one row of adsorption holes, and each row of adsorption holes includes a plurality of adsorption holes spaced apart along the axial direction of the adhesive roller.

13. The winding apparatus according to claim 12, characterized in that, The number of adsorption pores in each row of the plurality of pore groups is equal.

14. The winding apparatus according to claim 12, characterized in that, The number of rows of adsorption pores is equal in the plurality of pore groups.

15. The winding apparatus according to claim 10, characterized in that, The negative pressure space is provided with a separator, which divides the negative pressure space into a first space and a plurality of second spaces. The plurality of second spaces are arranged around the first space, and each second space is connected to at least one of the adsorption holes. The separator includes multiple partitions connected end to end, each partition corresponding to a second space, and each partition has a through hole that connects the first space and the second space.

16. The winding apparatus according to claim 15, characterized in that, The cross-section of the separator is arc-shaped and perpendicular to the axial direction of the adhesive roller. Along the extension direction of the arc, the separator has two ends, and the middle part of the separator is closer to the rotation axis of the adhesive roller than the two ends of the separator. The partition is provided with a plurality of second hole groups, each of which includes a plurality of through holes with the same diameter, and the diameter of the plurality of second hole groups increases from the middle to both ends of the partition.

17. A winding device, characterized in that, include: The first unwinding mechanism is used to unwind the first electrode sheet; The second unwinding mechanism is used to unwind the release film; The third unwinding mechanism is used to unwind the second electrode sheet; The winding apparatus according to any one of claims 1-16, the winding apparatus being used to wind the first electrode, the separator and the second electrode to form an electrode assembly.

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