Winding and unwinding equipment and battery production line

Abstract

The embodiment of the utility model provides winding and unwinding equipment and a battery production line. The winding and unwinding equipment is used for winding or unwinding a material belt and comprises a first winding drum and a clamping mechanism, the first winding drum is provided with an outer circumferential face and an inner circumferential face which are opposite in the radial direction of the first winding drum, a limiting groove penetrating through the inner circumferential face and the outer circumferential face of the first winding drum is formed in the first winding drum, and the starting end of the material belt can penetrate through the limiting groove; the clamping mechanism is arranged on the first winding drum and used for clamping and fixing the starting end of the material belt. According to the technical scheme, the fixing effect on the material belt is good.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a winding and unwinding device and a battery production line. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the battery manufacturing process, the electrode is one of the important components. During the winding or unwinding process, the starting end of the electrode is generally adhered to the reel of the winding and unwinding equipment with tape, which may easily lead to problems such as glue remaining on the surface of the reel or the electrode being not firmly fixed. Utility Model Content

[0004] The present application provides a winding and unwinding device, which has a good fixing effect on the material belt.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, an embodiment of the present application provides a winding and unwinding device, which is used for winding or unwinding a material tape. The winding and unwinding device includes a first reel and a clamping mechanism. Along the radial direction of the first reel, the first reel has a relative outer circumference and an inner circumference. The first reel is provided with a limiting groove that passes through the inner circumference and the outer circumference of the first reel, and the limiting groove is used for the starting end of the supply tape to pass through; the clamping mechanism is arranged on the first reel, and the clamping mechanism is used to clamp and fix the starting end of the material tape.

[0007] In the technical solution of the embodiment of the present application, the material strip can be a pole piece material strip for battery manufacturing. By opening a limiting groove on the first reel, the limiting groove is arranged through the inner circumference and the outer circumference of the first reel, so that the starting end of the material strip is arranged in the limiting groove, which is convenient for the arrangement of the clamping mechanism. The clamping mechanism clamps and fixes the starting end of the material strip by clamping, and has a good fixing effect on the starting end of the material strip. Compared with the starting end of the material strip being fixed to the outer circumference of the first reel by conventional adhesive, the method of clamping and fixing the material strip by the clamping mechanism does not need to consider the amount of adhesive used for the tape, and there will be no phenomenon of adhesive remaining on the outer circumference of the first reel or the material strip being not firmly fixed.

[0008] According to some embodiments of the present application, the clamping mechanism is disposed on the inner circumference of the first reel.

[0009] In the above solution, the clamping mechanism is arranged on one side of the inner circumference of the first reel. Compared with the case where the clamping mechanism is arranged in the limit groove to fix the material belt, the installation space on one side of the inner circumference of the first reel is larger, which is more conducive to the installation layout of the clamping mechanism. In addition, since the clamping mechanism does not need to be arranged in the limit groove, the size of the limit groove can be smaller, and only needs to be sufficient for the starting end of the material belt to pass through, which is conducive to the winding and unwinding of the material belt.

[0010] According to some embodiments of the present application, the clamping mechanism includes a first clamping member and a second clamping member; at least one of the first clamping member and the second clamping member is movably disposed on the first reel so that the first clamping member and the second clamping member can be close to clamp the starting end of the material strip.

[0011] In the above solution, at least one of the first clamping member and the second clamping member is movable, so the first clamping member and the second clamping member can move closer to or farther away from each other to achieve clamping of the starting end of the material strip, which has strong flexibility.

[0012] According to some embodiments of the present application, the first clamping member is fixedly disposed on the first reel, and the second clamping member is movably disposed on the first reel.

[0013] In the above scheme, the first clamping member is fixed and the second clamping member is movable to clamp the starting end of the material strip, which is more convenient to operate. The starting end of the material strip can be clamped or released by only adjusting the relative position of the second clamping member.

[0014] According to some embodiments of the present application, the first clamping member and the second clamping member are magnetically engaged with each other.

[0015] In the above scheme, by adopting a magnetic connection between the first clamping member and the second clamping member, the magnetic force can adsorb the second clamping member on the first clamping member, and the second clamping member is clamped with the first clamping member under the action of the magnetic force, so as to clamp and fix the starting end of the material strip, and the structure is simple. When the clamping force on the material strip needs to be canceled, it is only necessary to overcome the magnetic attraction force to separate the second clamping member from the first clamping member, and the operation is simple and convenient, and easy to implement.

[0016] According to some embodiments of the present application, the first clamping member includes a first body and a first magnetic member, and the first magnetic member is connected to the first body; the second clamping member includes a second body and a second magnetic member, and the second magnetic member is connected to the second body; the magnetic poles of the first magnetic member and the second magnetic member are in opposite directions.

[0017] In the above scheme, by arranging magnetic members with opposite magnetic poles on the first body and the second body, the magnetic connection between the first clamping member and the second clamping member is achieved by utilizing the magnet effect that like poles repel and opposite poles attract.

[0018] According to some embodiments of the present application, a first mounting groove and a second mounting groove are respectively provided on the sides facing each other of the first body and the second body, the first magnetic attraction component is embedded in the first mounting groove, and the second magnetic attraction component is embedded in the second mounting groove.

[0019] In the above scheme, by respectively providing the first mounting groove and the second mounting groove on the first body and the second body, the first magnetic attraction component can be installed in the first mounting groove and the second magnetic attraction component can be installed in the second mounting groove, the first mounting groove can play the function of positioning and limiting the first magnetic attraction component, and the second mounting groove can play the function of positioning and limiting the second magnetic attraction component, and the installation stability of the first magnetic attraction component and the second magnetic attraction component is higher.

[0020] According to some embodiments of the present application, the first body has a first surface facing the second body, the first mounting groove is arranged on the first surface, and the side of the first magnetic attraction component away from the bottom surface of the first mounting groove is flush with the first surface; the second body has a second surface facing the first body, the second mounting groove is arranged on the second surface, and the side of the second magnetic attraction component away from the bottom surface of the second mounting groove is flush with the second surface.

[0021] In the above scheme, the first magnetic attraction member is flush with the first installation groove, so that the first surface of the first body is in a planar state. Similarly, the second magnetic attraction member is flush with the second installation groove, so that the second surface of the second body is in a planar state. In this way, the surfaces of the first clamping member and the second clamping member facing each other can contact the material strip, and the contact area with the material strip is larger. Under the condition of the same clamping force, the clamping mechanism exerts less pressure on the starting end of the material strip, and the material strip is not easily squeezed and deformed.

[0022] According to some embodiments of the present application, the number of first magnetic components is set to multiple, and the multiple first magnetic components are distributed at intervals along the axial direction of the first reel; the number of second magnetic components is set to multiple, and the multiple second magnetic components are distributed at intervals along the axial direction of the first reel.

[0023] In the above scheme, by setting the number of the first magnetic attraction member and the second magnetic attraction member to be multiple, there are multiple magnetic attraction points between the first clamping member and the second clamping member, and the clamping force between the first clamping member and the second clamping member is more stable and reliable. Even when one or more magnetic attraction members between the first clamping member and the second clamping member fail, the second clamping member can still be magnetically adsorbed on the first clamping member to achieve stable clamping of the starting end of the material strip. In addition, by adjusting the number of the first magnetic attraction member and / or the second magnetic attraction member, the clamping force of the clamping mechanism can be adjusted, and the scope of application is wider.

[0024] According to some embodiments of the present application, the first body has a first surface facing the second body and a third surface close to the outer peripheral surface, and the first surface and the second surface are connected by a first rounded portion; and / or, the second body has a second surface facing the first body and a fourth surface close to the outer peripheral surface, and the second surface and the fourth surface are connected by a second rounded portion.

[0025] In the above scheme, since the width of the limiting groove is greater than the thickness of the material strip to allow the starting end of the material strip to pass through, when the first clamping member and the second clamping member clamp the starting end of the material strip, at least one of the first clamping member or the second clamping member is likely to interfere with the starting end of the material strip. By setting the first rounded corner portion and / or the second rounded corner portion, when the material strip is clamped by the first clamping member and the second clamping member after passing through the limiting groove, even if the material strip contacts the first rounded corner portion or the second rounded corner portion, it can guide and buffer the starting end of the material strip, and compared with the first body and the second body having right-angled tips on the side surfaces, it can reduce damage to the material strip.

[0026] According to some embodiments of the present application, a first positioning portion and a second positioning portion are respectively provided on the opposite sides of the first body and the second body, and when the first clamping member and the second clamping member clamp the starting end of the material strip, the first positioning portion and the second positioning portion are plugged into each other.

[0027] In the above scheme, when the second clamping member approaches the first clamping member and is ready to clamp the starting end of the material strip, the first positioning part and the second positioning part are plugged in and matched to play the positioning function of the clamping mechanism. The staff can observe whether the first positioning part and the second positioning part are plugged in and in place to judge whether the clamping mechanism has clamped the starting end of the material strip in place. In addition, when the winding and unwinding equipment is winding or unwinding the material strip, the first positioning part and the second positioning part are plugged in and matched to improve the clamping stability of the first clamping member and the second clamping member, prevent relative displacement between the first clamping member and the second clamping member, and the clamping mechanism has higher clamping stability for the material strip.

[0028] According to some embodiments of the present application, the first positioning portions are disposed at two ends of the first body along the axial direction of the first reel, and the second positioning portions are disposed at two ends of the second body along the axial direction of the first reel.

[0029] In the above scheme, by setting the first positioning part at both ends of the first body, the second positioning part can be set at both ends of the second body. On the one hand, there are two positioning points between the first clamping member and the second clamping member, and the positioning effect between the first clamping member and the second clamping member is good. On the other hand, the material strip is located between the first clamping member and the second clamping member, and the positioning part is set at both ends of the first body or the second body, which can reduce the risk of interference between the first positioning part or the second positioning part and the material strip.

[0030] According to some embodiments of the present application, the first positioning portion is a protrusion, and the second positioning portion is a groove.

[0031] In the above scheme, the protrusion is plugged into and matched with the groove, so that the first clamping member and the second clamping member are plugged and positioned, and the positioning effect is good.

[0032] According to some embodiments of the present application, the first body, the second body and the first reel are made of the same material.

[0033] In the above solution, the first body, the second body and the first reel are made of the same material, which is convenient to obtain and easy to manufacture.

[0034] According to some embodiments of the present application, the winding and unwinding device also includes a second reel and a connecting member, wherein the second reel is located on the inner side of the first reel, and along the radial direction of the first reel, the outer circumference of the second reel is spaced apart from the inner circumference of the first reel; the connecting member is arranged between the inner circumference of the first reel and the outer circumference of the second reel, and the connecting member connects the first reel and the second reel.

[0035] In the above solution, the second reel is arranged inside the first reel, and the area between the second reel and the first reel forms a space for the clamping mechanism to be arranged, and the position selection of the clamping mechanism is more flexible. The second reel is connected to the first reel through a connecting piece to realize the integrity of the winding and unwinding device.

[0036] According to some embodiments of the present application, the number of connecting members is set to multiple, and the multiple connecting members are distributed at intervals along the circumference of the first reel.

[0037] In the above solution, the plurality of connecting members are distributed along the circumference of the first reel, and the plurality of connecting members connect the first reel and the second reel as a whole, so that the reeling and unreeling device has a stronger integrity.

[0038] In a second aspect, an embodiment of the present application further provides a battery production line, which includes the above-mentioned winding and unwinding equipment, and the winding and unwinding equipment is used to wind or unwind the electrode material strip.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1This is a schematic diagram of the structure of the reeling and unreeling equipment in some embodiments of the present application;

[0042] Figure 2 A side view of a winding and unwinding device according to some embodiments of the present application;

[0043] Figure 3 A side view of a winding and unwinding device holding a material belt according to some embodiments of the present application;

[0044] Figure 4 for Figure 3 A is an enlarged schematic diagram;

[0045] Figure 5 A front cross-sectional view of a winding and unwinding device according to some embodiments of the present application;

[0046] Figure 6 This is a schematic diagram of the structure of a second clamping member in a reeling and unreeling device in some embodiments of the present application;

[0047] Figure 7 A schematic diagram of the structure of a clamping mechanism of a winding and unwinding device according to some other embodiments of the present application;

[0048] Figure 8 This is a side view of the reeling and unreeling equipment after reeling in the material tape in some embodiments of the present application.

[0049] Icons: 21-material strip; 210-starting end; 400-reeling and unreeling device; 410-first reel; 411-outer circumference; 412-inner circumference; 413-limiting groove; 420-clamping mechanism; 421-first clamping member; 4210-first body; 4211-first magnetic member; 4212-first surface; 4213-third surface; 4214-first fillet; 4215-first positioning portion; 422-second clamping member; 4220-second body; 4221-second magnetic member; 4222-second surface; 4223-fourth surface; 4224-second fillet; 4225-second positioning portion; 423-driving portion; 424-connecting rod mechanism; 430-second reel; 440-connecting member. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0052] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0055] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0056] At present, in the battery manufacturing process, the pole piece in the battery is one of the important components. During the winding or unwinding process of the pole piece, the starting end of the pole piece is generally attached to the reel of the winding and unwinding equipment with tape, but the amount of tape used is difficult to control. When the amount of tape used is too much, it is easy to cause glue to remain on the surface of the reel, which is inconvenient to clean, and the tape residue on the reel will contaminate the pole piece. When the amount of tape used is too little, the pole piece is prone to be not firmly fixed.

[0057] Based on the above considerations, in order to better fix the starting end of the electrode piece, the present application designs a winding and unwinding device, which includes a first reel and a clamping mechanism. Along the radial direction of the first reel, the first reel has a relative outer circumference and an inner circumference, and the first reel is provided with a limiting groove that passes through the inner circumference and the outer circumference of the first reel, and the limiting groove is used for the starting end of the feed tape to pass through; the clamping mechanism is arranged on the first reel, and the clamping mechanism is used to clamp and fix the starting end of the material tape.

[0058] In such a winding and unwinding device, the clamping mechanism clamps and fixes the starting end of the material tape by clamping, which has a good fixing effect on the starting end of the material tape (for example, the pole piece). Compared with the starting end of the material tape being fixed to the outer circumference of the first reel by conventional gluing, the clamping mechanism fixes the material tape in a way that does not require consideration of the amount of glue used, and there will be no glue remaining on the outer circumference of the first reel or the material tape being loosely fixed.

[0059] The present application embodiment provides a winding and unwinding device, please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of the reeling and unreeling equipment in some embodiments of the present application; Figure 2 A side view of a winding and unwinding device according to some embodiments of the present application; Figure 3 A side view of a winding and unwinding device holding a material belt according to some embodiments of the present application; Figure 4 for Figure 3 The enlarged schematic diagram of A in the figure. The reeling and unreeling device 400 is used for reeling or unreeling the material belt 21. The reeling and unreeling device 400 includes a first reel 410 and a clamping mechanism 420. Along the radial direction of the first reel 410, the first reel 410 has an outer peripheral surface 411 and an inner peripheral surface 412 relative to each other. The first reel 410 is provided with a limiting groove 413 penetrating the inner peripheral surface 412 and the outer peripheral surface 411 of the first reel 410. The limiting groove 413 is used for the starting end 210 of the material belt 21 to pass through. The clamping mechanism 420 is provided on the first reel 410, and the clamping mechanism 420 is used to clamp and fix the starting end 210 of the material belt 21.

[0060] The first reel 410 is a cylindrical structure, and the clamping mechanism 420 is a clamping structure disposed on the first reel 410 . The clamping mechanism 420 can fix the starting end 210 of the material strip 21 .

[0061] The radial direction refers to the linear direction of the diameter or radius of the first drum 410 , or the linear direction perpendicular to the axial direction. The outer circumference 411 refers to the outer surface area of ​​the outer circumference of the first drum 410 , and the inner circumference 412 refers to the inner surface area of ​​the inner circumference of the first drum 410 .

[0062] The starting end 210 of the material strip 21 refers to an end of the material strip 21 in the length direction, that is, the end of the material strip 21 that first contacts the first reel 410 . The material strip 21 may be a pole piece.

[0063] The clamping mechanism 420 can be disposed in the limiting groove 413 or on one side of the inner circumferential surface 412 of the first reel 410 , and both can achieve clamping and fixing of the starting end 210 of the material strip 21 .

[0064] The limiting groove 413 is arranged through the inner circumference 412 and the outer circumference 411 of the first reel 410, so that the starting end 210 of the material strip 21 is arranged in the limiting groove 413, which is convenient for the arrangement of the clamping mechanism 420. The groove width of the limiting groove 413 can be adaptively set according to the actual thickness of the material strip. For example, the groove width of the limiting groove 413 can be 0.5-1.0 cm, that is, the groove width of the limiting groove 413 can be any value such as 0.5 cm, 0.6 cm, 0.7 cm, 0.8 cm, 0.9 cm or 1.0 cm.

[0065] In the technical solution of the embodiment of the present application, a limiting groove 413 is provided on the first reel 410, and the limiting groove 413 is arranged through the outer circumference 411 and the inner circumference 412 of the first reel 410, so that the starting end of the material belt 21 is arranged in the limiting groove 413, which is convenient for the arrangement of the clamping mechanism 420. The clamping mechanism 420 clamps and fixes the starting end 210 of the material belt 21 by clamping, and has a good fixing effect on the starting end 210 of the material belt 21. Compared with the starting end 210 of the material belt 21 being fixed to the outer circumference 411 of the first reel 410 by conventional adhesive, the clamping mechanism 420 clamps and fixes the material belt 21 in a way that does not need to consider the amount of adhesive used for the tape, and there will be no phenomenon that adhesive is left on the outer circumference 411 of the first reel 410 or the material belt 21 is not firmly fixed.

[0066] According to some embodiments of this application, please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the reeling and unreeling equipment in some embodiments of the present application; Figure 2 The side view of the reeling and unreeling device of some embodiments of the present application. The clamping mechanism 420 is disposed on the inner circumference 412 of the first reel 410 .

[0067] The clamping mechanism 420 is arranged on one side of the inner circumference 412 of the first reel 410. Compared with the case where the clamping mechanism 420 is arranged in the limiting groove 413 to fix the material belt 21, the installation space on one side of the inner circumference 412 of the first reel 410 is larger, which is more conducive to the installation layout of the clamping mechanism 420. In addition, since the clamping mechanism 420 does not need to be arranged in the limiting groove 413, the size of the limiting groove 413 can be smaller, and only needs to be sufficient for the starting end 210 of the material belt 21 to pass through, which is conducive to the winding and unwinding of the material belt 21.

[0068] According to some embodiments of this application, please continue to refer to Figure 2 The clamping mechanism 420 includes a first clamping member 421 and a second clamping member 422; at least one of the first clamping member 421 and the second clamping member 422 is movably disposed on the first reel 410 so that the first clamping member 421 and the second clamping member 422 can be close to clamp the starting end 210 of the material strip 21.

[0069] At least one of the first clamping member 421 and the second clamping member 422 is movably disposed on the first reel 410. It can be understood that the first clamping member 421 is movably disposed on the inner circumference 412 of the first reel 410, and the second clamping member 422 is fixedly disposed on the inner circumference 412 of the first reel 410. Alternatively, the second clamping member 422 is movably disposed on the inner circumference 412 of the first reel 410, and the first clamping member 421 is fixedly disposed on the inner circumference 412 of the first reel 410. Alternatively, both the first clamping member 421 and the second clamping member 422 are movably disposed on the inner circumference 412 of the first reel 410.

[0070] At least one of the first clamping member 421 and the second clamping member 422 is movable, so the first clamping member 421 and the second clamping member 422 can move closer to or farther from each other to clamp the starting end 210 of the material strip 21 , which has high flexibility.

[0071] According to some embodiments of the present application, the first clamping member 421 is fixedly disposed on the first reel 410 , and the second clamping member 422 is movably disposed on the first reel 410 .

[0072] The first clamping member 421 can be fixed on the first reel 410 in a variety of ways, for example, the first clamping member 421 can be fixed by glue or screws. In this embodiment, the first clamping member 421 is fixed to the inner circumference 412 of the first reel 410 by glue.

[0073] The clamping force between the first clamping member 421 and the second clamping member 422 can be realized in a variety of ways. For example, the first clamping member 421 and the second clamping member 422 are clamped and fixed by magnetic attraction. Of course, the second clamping member 422 can also be provided with a driving part 423 (for example, a clamping cylinder), and the driving part 423 is used to drive the second clamping member 422 to approach or move away from the first clamping member 421.

[0074] The second clamping member 422 is movable and arranged on one side of the inner circumference 412 of the first reel 410, which means that the second clamping member 422 may or may not be connected to the inner circumference 412 of the first reel 410. When the first clamping member 421 and the second clamping member 422 are clamped by magnetic attraction, the second clamping member 422 may not be connected to the inner circumference 412 of the first reel 410. When necessary, the second clamping member 422 is slowly brought close to the first clamping member 421. Under the adsorption of the magnetic force, the second clamping member 422 and the first clamping member 421 are clamped and matched to achieve the clamping and fixing of the starting end 210 of the material strip 21. When the material strip 21 needs to be removed, the second clamping member 422 and the first clamping member 421 can be separated by overcoming the magnetic force.

[0075] Of course, the second clamping member 422 can also be slidably disposed on the inner circumference 412 of the first reel 410, for example, please refer to Figure 7 , Figure 7 The following is a schematic diagram of the structure of the clamping mechanism of the reeling and unwinding device of some other embodiments of the present application. When the second clamping member 422 is driven by the driving unit 423 (for example, the clamping cylinder) to approach the first clamping member 421 to achieve clamping, the inner circumference 412 of the first reel 410 can be provided with an arc-shaped slide rail, which is extended along the circumference of the first reel 410, and the slide rail is disconnected at the limit groove 413, and the second clamping member 422 slides with the slide rail. A connecting rod mechanism 424 is provided between the driving unit 423 and the second clamping member 422, one end of the connecting rod mechanism 424 is hinged to the driving shaft of the clamping cylinder, and the other end is hinged to the second clamping member 422. The driving unit 423 is used to drive the second clamping member 422 to move around the inner circumference 412 of the first reel 410, so as to approach the first clamping member 421 and clamp it to the starting end 210 of the material strip 21. When the material strip 21 needs to be removed, the driving unit 423 drives the second clamping member 422 to move away from the first clamping member 421 . After the material strip 21 loses the clamping force of the first clamping member 421 and the second clamping member 422 , the material strip 21 can be removed.

[0076] The first clamping member 421 is fixed and the second clamping member 422 is movable to clamp the starting end 210 of the material strip 21, which is more convenient to operate. The starting end 210 of the material strip 21 can be clamped or released by only adjusting the relative position of the second clamping member 422.

[0077] According to some embodiments of the present application, the first clamping member 421 and the second clamping member 422 are magnetically coupled.

[0078] There are many ways to realize the magnetic attraction between the first clamping member 421 and the second clamping member 422. For example, one of the first clamping member 421 and the second clamping member 422 is a metal part, and the other is a permanent magnet or an electromagnet. The magnetic attraction between the first clamping member 421 and the second clamping member 422 is realized by using the principle of magnet-metal attraction. Of course, the first clamping member 421 and the second clamping member 422 can also be provided with permanent magnets with opposite magnetic poles, and the magnetic attraction connection between the first clamping member 421 and the second clamping member 422 can be realized by using the magnet effect of like poles repelling and opposite poles attracting.

[0079] By using a magnetic connection between the first clamping member 421 and the second clamping member 422, the magnetic force can adsorb the second clamping member 422 onto the first clamping member 421, and the second clamping member 422 is clamped with the first clamping member 421 under the action of the magnetic force, so as to clamp and fix the starting end 210 of the material strip 21, and the structure is simple. When the clamping force on the material strip 21 needs to be canceled, it is only necessary to overcome the magnetic attraction force to separate the second clamping member 422 from the first clamping member 421, and the operation is simple and convenient, and easy to implement.

[0080] According to some embodiments of this application, please refer to Figure 4 The first clamping member 421 includes a first body 4210 and a first magnetic member 4211, and the first magnetic member 4211 is connected to the first body 4210; the second clamping member 422 includes a second body 4220 and a second magnetic member 4221, and the second magnetic member 4221 is connected to the second body 4220; the magnetic poles of the first magnetic member 4211 and the second magnetic member 4221 are in opposite directions.

[0081] The first body 4210 provides a mounting base for the first magnetic member 4211, and the second body 4220 provides a mounting base for the second magnetic member 4221. The first magnetic member 4211 and the second magnetic member 4221 are permanent magnets with opposite magnetic poles, which are easy to obtain and low in cost.

[0082] By providing magnetic members with opposite magnetic poles on the first body 4210 and the second body 4220 , the magnetic connection between the first clamping member 421 and the second clamping member 422 is achieved by utilizing the magnet effect that like poles repel and opposite poles attract.

[0083] According to some embodiments of the present application, a first mounting groove and a second mounting groove are respectively provided on the opposite sides of the first body 4210 and the second body 4220, the first magnetic component 4211 is embedded in the first mounting groove, and the second magnetic component 4221 is embedded in the second mounting groove.

[0084] The first mounting groove and the second mounting groove are groove structures arranged on the opposite sides of the first body 4210 and the second body 4220 . The first mounting groove is used to accommodate the first magnetic attraction member 4211 , and the second mounting groove is used to accommodate the second magnetic attraction member 4221 .

[0085] There are many ways to connect the first magnetic member 4211 to the first body 4210, such as by gluing, screws, or interference fit to fix it in the first mounting groove. Similarly, there are many ways to connect the second magnetic member 4221 to the second body 4220, such as by gluing, screws, or interference fit to fix it in the second mounting groove.

[0086] By respectively providing a first mounting groove on the first body 4210 and a second mounting groove on the second body 4220, the first magnetic component 4211 can be installed in the first mounting groove and the second magnetic component 4221 can be installed in the second mounting groove. The first mounting groove can play a positioning and limiting function for the first magnetic component 4211, and the second mounting groove can play a positioning and limiting function for the second magnetic component 4221. The installation stability of the first magnetic component 4211 and the second magnetic component 4221 is higher.

[0087] According to some embodiments of this application, please refer to Figure 4 The first body 4210 has a first surface 4212 facing the second body 4220, the first mounting groove is arranged on the first surface 4212, and the side of the first magnetic attraction component 4211 away from the bottom surface of the first mounting groove is flush with the first surface 4212; the second body 4220 has a second surface 4222 facing the first body 4210, the second mounting groove is arranged on the second surface 4222, and the side of the second magnetic attraction component 4221 away from the bottom surface of the second mounting groove is flush with the second surface 4222.

[0088] The first surface 4212 refers to the surface of the first body 4210 close to the second body 4220, and the second surface 4222 refers to the surface of the second body 4220 close to the first body 4210. The first surface 4212 and the second surface 4222 are arranged opposite to each other. Flush means that the side of the first magnetic member 4211 away from the bottom surface of the first installation slot is coplanar with the first surface 4212, or the side of the second magnetic member 4221 away from the bottom surface of the second installation slot is coplanar with the second surface 4222.

[0089] The first magnetic member 4211 may be protruding from the first surface 4212 , or may be flush with the first surface 4212 , or the height of the first magnetic member 4211 may be lower than the first surface 4212 .

[0090] The first magnetic component 4211 is flush with the first mounting groove, so that the first surface 4212 of the first body 4210 is in a planar state. Similarly, the second magnetic component 4221 is flush with the second mounting groove, so that the second surface 4222 of the second body 4220 is in a planar state. In this way, the surfaces of the first clamping component 421 and the second clamping component 422 facing each other can contact the material strip 21, and the contact area with the material strip 21 is larger. Under the condition of the same clamping force, the clamping mechanism 420 exerts less pressure on the starting end 210 of the material strip 21, and the material strip 21 is not easily squeezed and deformed.

[0091] According to some embodiments of this application, please refer to Figure 5 and Figure 6 , Figure 5 A front cross-sectional view of a winding and unwinding device according to some embodiments of the present application; Figure 6 Schematic diagram of the structure of the second clamping member in the reeling and unreeling device of some embodiments of the present application. The number of the first magnetic members 4211 is set to be multiple, and the multiple first magnetic members 4211 are distributed along the axial direction of the first reel 410 at intervals; the number of the second magnetic members 4221 is set to be multiple, and the multiple second magnetic members 4221 are distributed along the axial direction of the first reel 410 at intervals.

[0092] The number of the first magnetic member 4211 and the second magnetic member 4221 can be any integer value such as three, five, eight, ten or twelve. The number of the first magnetic member 4211 and the second magnetic member 4221 can be equal or unequal. In this embodiment, the first magnetic member 4211 and the second magnetic member 4221 are equal, and the number is twelve. And each first magnetic member 4211 on the first clamping member 421 and each second magnetic member 4221 on the second clamping member 422 are arranged one by one.

[0093] In the case where the number of the first magnetic member 4211 and the second magnetic member 4221 is multiple, the number of the first mounting slot or the second mounting slot can be one or more. In the case where the number of the first mounting slot or the second mounting slot is one, multiple first magnetic members 4211 can be distributed in the same first mounting slot, that is, multiple first magnetic members 4211 share the same first mounting slot. Similarly, multiple second magnetic members 4221 can be distributed in the same second mounting slot, and the second mounting slots are distributed along the length direction of the second body 4220, so that multiple second magnetic members 4221 share the same second mounting slot.

[0094] When there are multiple first mounting slots or multiple second mounting slots, each first mounting slot can accommodate one first magnetic member 4211 or multiple first magnetic members 4211. Each second mounting slot can accommodate one second magnetic member 4221 or multiple second magnetic members 4221, depending on the actual situation.

[0095] The shapes of the first magnetic member 4211 and the second magnetic member 4221 can be any shape such as circular, rectangular or hexagonal. In this embodiment, the number of the first magnetic member 4211 and the second magnetic member 4221 is circular, and the shapes of the first installation groove and the second installation groove are also circular.

[0096] Each first mounting slot can accommodate a corresponding first magnetic member 4211. Similarly, when there are multiple second mounting slots, each second mounting slot can accommodate a corresponding second magnetic member 4221. Of course, the specific number of first magnetic members 4211 on the first body 4210 and the specific number of second magnetic members 4221 on the second body 4220 can be placed according to actual conditions, that is, in order to ensure that the starting end 210 of the material strip 21 does not fall off when the first reel 410 starts to rotate after being clamped, the clamping force of the clamping mechanism 420 can be adjusted by adjusting the number of the first magnetic members 4211 and / or the second magnetic members 4221, and the adjustment is convenient.

[0097] By setting the number of the first magnetic member 4211 and the second magnetic member 4221 to be multiple, there are multiple magnetic points between the first clamping member 421 and the second clamping member 422, and the clamping force between the first clamping member 421 and the second clamping member 422 is more stable and reliable. Even when one or more magnetic members between the first clamping member 421 and the second clamping member 422 fail, the second clamping member 422 can still be magnetically adsorbed on the first clamping member 421 to achieve stable clamping of the starting end 210 of the material strip 21. In addition, by adjusting the number of the first magnetic member 4211 and / or the second magnetic member 4221, the clamping force of the clamping mechanism 420 can be adjusted, and the scope of application is wider.

[0098] According to some embodiments of this application, please refer to Figure 4 The first body 4210 has a first surface 4212 facing the second body 4220 and a third surface 4213 close to the outer peripheral surface 411, and the first surface 4212 and the second surface 4222 are connected by a first rounded portion 4214; and / or, the second body 4220 has a second surface 4222 facing the first body 4210 and a fourth surface 4223 close to the outer peripheral surface 411, and the second surface 4222 and the fourth surface 4223 are connected by a second rounded portion 4224.

[0099] The first surface 4212 refers to the surface of the first body 4210 close to the second body 4220, the third surface 4213 refers to the surface of the first body 4210 close to the outer circumference 411 of the first reel 410, the second surface 4222 refers to the surface of the second body 4220 close to the first body 4210, the first surface 4212 and the second surface 4222 are arranged opposite to each other, and the fourth surface 4223 refers to the surface of the second body 4220 close to the outer circumference 411.

[0100] The first fillet portion 4214 refers to an arc-shaped chamfered structure or an arc-shaped structure connected between the first surface 4212 and the third surface 4213. The second fillet portion 4224 refers to an arc-shaped chamfered structure or an arc-shaped structure connected between the second surface 4222 and the fourth surface 4223.

[0101] Since the width of the limiting groove 413 is greater than the thickness of the material strip 21 so that the starting end 210 of the material strip 21 can pass through, when the first clamping member 421 and the second clamping member 422 clamp the starting end 210 of the material strip 21, at least one of the first clamping member 421 or the second clamping member 422 is likely to interfere with the starting end 210 of the material strip 21. By setting the first rounded corner portion 4214 and / or the second rounded corner portion 4224, when the material strip 21 is clamped by the first clamping member 421 and the second clamping member 422 after passing through the limiting groove 413, even if the material strip 21 contacts the first rounded corner portion 4214 or the second rounded corner portion 4224, it can guide and buffer the starting end 210 of the material strip 21, and compared with the right-angled tips of the side surfaces of the first body 4210 and the second body 4220, it can reduce damage to the material strip 21.

[0102] According to some embodiments of this application, please refer to Figure 5 and Figure 6 A first positioning portion 4215 and a second positioning portion 4225 are respectively provided on the opposite sides of the first body 4210 and the second body 4220. When the first clamping member 421 and the second clamping member 422 clamp the starting end 210 of the material strip 21, the first positioning portion 4215 and the second positioning portion 4225 are plugged into each other.

[0103] The first positioning portion 4215 and the second positioning portion 4225 can be a protrusion and groove structure, that is, the first positioning portion 4215 can be either a protrusion or a groove; similarly, the second positioning portion 4225 can be either a groove or a protrusion.

[0104] When the second clamping member 422 approaches the first clamping member 421 and is ready to clamp the starting end 210 of the material strip 21, the first positioning portion 4215 and the second positioning portion 4225 are plugged in and matched, which can play a positioning function for the clamping mechanism 420. The staff can observe whether the first positioning portion 4215 and the second positioning portion 4225 are plugged in and in place to determine whether the clamping mechanism 420 has clamped the starting end 210 of the material strip 21 in place. In addition, when the winding and unwinding device 400 is winding or unwinding the material strip 21, the first positioning portion 4215 and the second positioning portion 4225 are plugged in and matched, which can improve the clamping stability of the first clamping member 421 and the second clamping member 422, prevent the first clamping member 421 and the second clamping member 422 from relative displacement, and the clamping mechanism 420 has higher clamping stability for the material strip 21.

[0105] According to some embodiments of this application, please refer to Figure 6 The first positioning portions 4215 are disposed at two ends of the first body 4210 along the axial direction of the first reel 410 , and the second positioning portions 4225 are disposed at two ends of the second body 4220 along the axial direction of the first reel 410 .

[0106] The axial direction refers to the direction of the central axis of rotation of the first reel 410, that is, the same direction as the central axis.

[0107] By setting the first positioning portion 4215 at both ends of the first body 4210 and the second positioning portion 4225 at both ends of the second body 4220, on the one hand, there are two positioning points between the first clamping member 421 and the second clamping member 422, and the positioning effect between the first clamping member 421 and the second clamping member 422 is good. On the other hand, the material strip 21 is located between the first clamping member 421 and the second clamping member 422. By setting the positioning portion at both ends of the first body 4210 or the second body 4220, the risk of interference between the first positioning portion 4215 or the second positioning portion 4225 and the material strip 21 can be reduced.

[0108] According to some embodiments of the present application, the first positioning portion 4215 is a protrusion, and the second positioning portion 4225 is a groove.

[0109] The shape of the protrusion can be a rectangular block, a cylindrical block or a triangle. In this embodiment, the shape of the protrusion is a rectangular block, and the groove is a rectangular groove that matches the shape of the protrusion.

[0110] The protrusion and the groove are plugged and matched, so that the first clamping member 421 and the second clamping member 422 are plugged and positioned, and the positioning effect is good.

[0111] According to some embodiments of the present application, the first body 4210 , the second body 4220 , and the first reel 410 are made of the same material.

[0112] The first body 4210 , the second body 4220 and the first reel 410 may be made of various materials, such as metal, such as copper.

[0113] The first body 4210 , the second body 4220 and the first reel 410 are made of the same material, which is convenient to obtain and easy to manufacture.

[0114] According to some embodiments of this application, please refer to Figure 5 and Figure 8 , Figure 5 A front cross-sectional view of a winding and unwinding device according to some embodiments of the present application; Figure 8 The side view of the reeling and unreeling device of some embodiments of the present application after reeling the material tape. The reeling and unreeling device 400 further includes a second reel 430 and a connecting member 440. The second reel 430 is located inside the first reel 410. Along the radial direction of the first reel 410, the outer circumference 411 of the second reel 430 is spaced from the inner circumference 412 of the first reel 410. The connecting member 440 is disposed between the inner circumference 412 of the first reel 410 and the outer circumference 411 of the second reel 430. The connecting member 440 connects the first reel 410 and the second reel 430.

[0115] The second reel 430 has the same shape as the first reel 410, both of which are cylindrical structures. The outer diameter of the second reel 430 is smaller than the outer diameter of the first reel 410, that is, the second reel 430 is located inside the first reel 410. The second reel 430 is used to connect with the driving member of the winding and unwinding device 400 to drive the second reel 430 to rotate together with the first reel 410 to achieve the winding and unwinding of the material strip 21. The connecting member 440 can be a connecting rod or a connecting frame, and the material of the connecting member 440 is the same as that of the first reel 410 or the second reel 430.

[0116] The second reel 430 is disposed inside the first reel 410, and the area between the second reel 430 and the first reel 410 forms a space for the clamping mechanism 420 to be arranged, so that the position selection of the clamping mechanism 420 is more flexible. The second reel 430 is connected to the first reel 410 through a connecting member 440 to achieve the integrity of the reeling and unreeling device 400.

[0117] According to some embodiments of this application, please refer to Figure 8 The number of the connecting members 440 is set to be multiple, and the multiple connecting members 440 are distributed at intervals along the circumference of the first reel 410.

[0118] The number of the connecting members 440 can be three, five or seven, etc., depending on the actual situation. In this embodiment, the number of the connecting members 440 is seven, and the seven connecting members 440 are evenly spaced in the circumferential direction of the first reel 410 .

[0119] The plurality of connecting members 440 are distributed along the circumference of the first reel 410 . The plurality of connecting members 440 connect the first reel 410 and the second reel 430 as a whole, and the reeling and unreeling device 400 has a stronger integrity.

[0120] An embodiment of the present application further provides a battery production line, which includes the winding and unwinding device 400 of the above embodiment, and the winding and unwinding device 400 is used for winding or unwinding the electrode strip 21.

[0121] The present application embodiment provides a winding and unwinding device, please refer to Figures 2 to 4 The reeling and unwinding device 400 is used for reeling or unwinding the material belt 21. The reeling and unwinding device 400 includes a first reel 410 and a clamping mechanism 420. The clamping mechanism 420 is disposed on the first reel 410 and is used to clamp and fix the starting end 210 of the material belt 21. Along the radial direction of the first reel 410, the first reel 410 has an outer peripheral surface 411 and an inner peripheral surface 412 opposite to each other. The first reel 410 is provided with a limiting groove 413 that penetrates the inner peripheral surface 412 and the outer peripheral surface 411 of the first reel 410. The limiting groove 413 is used for the starting end 210 of the material belt 21 to pass through. The clamping mechanism 420 is disposed on the inner peripheral surface 412 of the first reel 410. The clamping mechanism 420 includes a first clamping member 421 and a second clamping member 422 ; the first clamping member 421 is fixedly disposed on the first reel 410 , and the second clamping member 422 is movably disposed on the first reel 410 , and the first clamping member 421 and the second clamping member 422 are magnetically engaged with each other.

[0122] By arranging the clamping mechanism 420 on the first reel 410, the clamping mechanism 420 clamps and fixes the starting end 210 of the material strip 21 by clamping, and the fixing effect of the starting end 210 of the material strip 21 is good. Compared with the starting end 210 of the material strip 21 being fixed to the outer circumference 411 of the first reel 410 by conventional adhesive, the method of fixing the material strip 21 by the clamping mechanism 420 does not need to consider the amount of adhesive used, and there will be no adhesive left on the outer circumference 411 of the first reel 410 or the material strip 21 will not be fixed firmly. The limiting groove 413 is arranged through the inner circumference 412 and the outer circumference 411 of the first reel 410, so that the starting end 210 of the material strip 21 is arranged in the limiting groove 413, which is convenient for the arrangement of the clamping mechanism 420. The clamping mechanism 420 is arranged on one side of the inner circumference 412 of the first reel 410. Compared with the case where the clamping mechanism 420 is arranged in the limiting groove 413 to fix the material belt 21, the installation space on one side of the inner circumference 412 of the first reel 410 is larger, which is more conducive to the installation layout of the clamping mechanism 420. In addition, since the clamping mechanism 420 does not need to be arranged in the limiting groove 413, the size of the limiting groove 413 can be smaller, and only needs to be sufficient for the starting end 210 of the material belt 21 to pass through, which is conducive to the winding and unwinding of the material belt 21.

[0123] The first clamping member 421 and the second clamping member 422 are connected by magnetic attraction. The magnetic force can adsorb the second clamping member 422 to the first clamping member 421. The second clamping member 422 is clamped with the first clamping member 421 under the action of the magnetic force, thereby clamping and fixing the starting end 210 of the material strip 21, and the structure is simple.

[0124] In some embodiments, the first clamping member 421 includes a first body 4210 and a first magnetic member 4211, and the first magnetic member 4211 is connected to the first body 4210; the second clamping member 422 includes a second body 4220 and a second magnetic member 4221, and the second magnetic member 4221 is connected to the second body 4220; the magnetic poles of the first magnetic member 4211 and the second magnetic member 4221 are opposite. The first body 4210 and the second body 4220 are respectively provided with a first mounting groove and a second mounting groove on the opposite sides, the first magnetic member 4211 is embedded in the first mounting groove, and the second magnetic member 4221 is embedded in the second mounting groove. The number of the first magnetic members 4211 is set to be multiple, and the multiple first magnetic members 4211 are distributed along the axial direction of the first reel 410 at intervals; the number of the second magnetic members 4221 is set to be multiple, and the multiple second magnetic members 4221 are distributed along the axial direction of the first reel 410 at intervals.

[0125] By providing magnetic components with opposite magnetic poles on the first body 4210 and the second body 4220, the magnetic connection between the first clamp 421 and the second clamp 422 is achieved by utilizing the magnet effect of like poles repelling and opposite poles attracting. By setting the number of the first magnetic component 4211 and the second magnetic component 4221 to be multiple, there are multiple magnetic points between the first clamp 421 and the second clamp 422, and the clamping force between the first clamp 421 and the second clamp 422 is more stable and reliable. Even when one or more magnetic components between the first clamp 421 and the second clamp 422 fail, the second clamp 422 can still be magnetically attracted to the first clamp 421, thereby achieving stable clamping of the starting end 210 of the material strip 21. In addition, by adjusting the number of the first magnetic component 4211 and / or the second magnetic component 4221, the clamping force of the clamping mechanism 420 can be adjusted, and the scope of application is wider.

[0126] In some embodiments, the first body 4210 and the second body 4220 are respectively provided with a first positioning portion 4215 and a second positioning portion 4225 on the opposite sides thereof. When the first clamping member 421 and the second clamping member 422 clamp the starting end 210 of the material strip 21, the first positioning portion 4215 and the second positioning portion 4225 are plugged in and matched. The plugging and matching of the first positioning portion 4215 and the second positioning portion 4225 can play a positioning function for the clamping mechanism 420. The staff can judge whether the clamping mechanism 420 clamps the starting end 210 of the material strip 21 in place by observing whether the first positioning portion 4215 and the second positioning portion 4225 are plugged in and in place. In addition, when the reeling and unreeling device 400 is reeling or unreeling the material strip 21, the first positioning portion 4215 and the second positioning portion 4225 are plugged into each other, which can improve the clamping stability of the first clamping member 421 and the second clamping member 422 and prevent relative displacement between the first clamping member 421 and the second clamping member 422. The clamping mechanism 420 has a higher clamping stability for the material strip 21.

[0127] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A winding and unwinding device for winding or unwinding a material strip, characterized in that: include: A first reel, wherein the first reel has an outer circumferential surface and an inner circumferential surface opposite to each other along the radial direction of the first reel, and a limiting groove penetrating the inner circumferential surface and the outer circumferential surface of the first reel is provided on the first reel, and the limiting groove is used for the starting end of the material strip to pass through; A clamping mechanism is arranged on the first reel, and is used to clamp and fix the starting end of the material strip.

2. The unwinding and rewinding device according to claim 1, characterized in that: The clamping mechanism is arranged on the inner circumferential surface of the first reel.

3. The unwinding and rewinding device according to claim 2, characterized in that: The clamping mechanism comprises a first clamping member and a second clamping member; At least one of the first clamping member and the second clamping member is movably disposed on the first reel, so that the first clamping member and the second clamping member can approach each other to clamp the starting end of the material tape.

4. The unwinding and rewinding device according to claim 3, characterized in that: The first clamping member is fixedly disposed on the first reel, and the second clamping member is movably disposed on the first reel.

5. The reeling and unreeling device according to claim 3, characterized in that: The first clamping member and the second clamping member are magnetically engaged with each other.

6. The unwinding and rewinding device according to claim 5, characterized in that: The first clamping member includes a first body and a first magnetic member, and the first magnetic member is connected to the first body; The second clamping member includes a second body and a second magnetic member, and the second magnetic member is connected to the second body; The magnetic poles of the first magnetic attraction component and the second magnetic attraction component are in opposite directions.

7. The unwinding and rewinding device according to claim 6, characterized in that: A first mounting groove and a second mounting groove are respectively provided on the opposite sides of the first body and the second body, the first magnetic attraction component is embedded in the first mounting groove, and the second magnetic attraction component is embedded in the second mounting groove.

8. The reeling and unreeling device according to claim 7, characterized in that: The first body has a first surface facing the second body, the first mounting groove is arranged on the first surface, and a side of the first magnetic attraction member away from the bottom surface of the first mounting groove is flush with the first surface; The second body has a second surface facing the first body, the second mounting groove is arranged on the second surface, and a side of the second magnetic attraction member away from the bottom surface of the second mounting groove is flush with the second surface.

9. The unwinding and rewinding device according to claim 6, characterized in that: The number of the first magnetic attraction members is set to be multiple, and the multiple first magnetic attraction members are distributed at intervals along the axial direction of the first reel; The number of the second magnetic elements is set to be multiple, and the multiple second magnetic elements are distributed at intervals along the axial direction of the first reel.

10. The reeling and unreeling device according to claim 8, characterized in that: The first body has a first surface facing the second body and a third surface close to the outer circumference of the first reel, and the first surface and the second surface are connected by a first rounded corner; and / or the second body has a second surface facing the first body and a fourth surface close to the outer circumference, and the second surface and the fourth surface are connected by a second rounded corner.

11. The reeling and unreeling device according to claim 6, characterized in that: A first positioning portion and a second positioning portion are respectively provided on the opposite sides of the first body and the second body. When the first clamping member and the second clamping member clamp the starting end of the material belt, the first positioning portion and the second positioning portion are plug-fitted.

12. The reeling and unreeling device according to claim 11, characterized in that: The first positioning portions are arranged at two ends of the first body along the axial direction of the first reel, and the second positioning portions are arranged at two ends of the second body along the axial direction of the first reel.

13. The reeling and unreeling device according to claim 11, characterized in that: The first positioning portion is a protrusion, and the second positioning portion is a groove.

14. The unwinding and rewinding device according to claim 6, characterized in that: The first body, the second body and the first reel are made of the same material.

15. The unwinding and rewinding device according to any one of claims 1 to 14, characterized in that: The reeling and unreeling device also includes: A second reel is located inside the first reel, and along the radial direction of the first reel, the outer circumference of the second reel is spaced from the inner circumference of the first reel; A connecting member is arranged between the inner circumference of the first drum and the outer circumference of the second drum, and the connecting member connects the first drum and the second drum.

16. The unwinding and rewinding device according to claim 15, characterized in that: The number of the connecting members is set to be multiple, and the multiple connecting members are distributed at intervals along the circumference of the first reel.

17. A battery production line, characterized in that: It comprises a winding and unwinding device according to any one of claims 1 to 16, wherein the winding and unwinding device is used for winding or unwinding a pole piece strip.

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