Rolling device and battery production equipment

Abstract

The utility model belongs to the technical field of battery production, and provides a rolling device and battery production equipment.The rolling device comprises a rack, a first roller body, a second roller body and a driving mechanism; the first roller body is rotationally connected to the rack; the second roller body is rotationally connected to the rack, and the second roller body and the first roller body are oppositely arranged; a plurality of protruding teeth are arranged on the roller face of the second roller body in a protruding mode and arranged around the axis of the second roller body at intervals, and the width of the protruding teeth is gradually reduced from the middle to the two ends in the extending length direction of the protruding teeth. The utility model aims to improve the non-deformability of the tab on the pole piece.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a rolling device and battery production equipment. Background Art

[0002] The production of electrode sheets is a critical step in the battery production process. The tabs are formed on the electrode sheets, and when the electrode sheets are wound, the tabs are prone to bending, which can affect the production quality of the battery and affect the quality and yield of the battery. Utility Model Content

[0003] The purpose of this application is to provide a rolling device and battery production equipment, aiming to solve the technical problems of poor tab stiffness and easy bending.

[0004] In a first aspect, the present application provides a rolling device, comprising:

[0005] frame;

[0006] A first roller body is rotatably connected to the frame;

[0007] The second roller body is rotatably connected to the frame, the second roller body is arranged opposite to the first roller body, and the axis of the second roller body is parallel to the axis of the first roller body; a plurality of convex teeth are convexly provided on the roller surface of the second roller body, and the plurality of convex teeth are arranged at intervals around the axis of the second roller body, and along the length direction in which the convex teeth extend, the width of the convex teeth tends to gradually decrease from the middle to both ends.

[0008] In this embodiment, a plurality of convex teeth are provided on the second roller body, and the surface of the pole ear is rolled by the convex teeth, so that a concave structure is formed on the surface of the pole ear, which is beneficial to increase the rigidity of the pole ear and improve the deformation resistance of the pole ear; furthermore, the shape of the convex teeth is gradually extended from the middle to the two ends, which is beneficial to reduce the stress concentration phenomenon and makes the area area of ​​the concave structure rolled out on the pole ear and the area area of ​​the convex structure more balanced, which is beneficial to further improve the deformation resistance of the pole ear.

[0009] In one embodiment, the rolling device further includes a driving mechanism connected to the first roller body to drive the first roller body to rotate.

[0010] In this embodiment, a driving mechanism is provided to drive the first roller to rotate relative to the frame. The first roller can serve as the power input part for the movement of the pole piece, and the friction between the first roller and the pole piece drives the pole piece to move between the first roller and the second roller.

[0011] In one embodiment, the protruding tooth has two oppositely disposed tooth side surfaces, and the tooth side surfaces are arc-shaped curved surfaces.

[0012] In this embodiment, the tooth side surfaces of the convex teeth are formed into arc-shaped surfaces, so that the concave side walls of the concave structure extruded on the tab are curved, which helps to alleviate the stress concentration phenomenon and further improve the tab's anti-deformation ability.

[0013] In one embodiment, along a direction perpendicular to the height of the protruding extension of the protruding tooth, the outer contour of the cross section of the protruding tooth is elliptical.

[0014] In this embodiment, the use of elliptical convex teeth is helpful in alleviating stress concentration, so that the area of ​​the concave part and the area of ​​the convex part of the tab are close to each other, which is helpful in improving the tab's anti-deformation ability.

[0015] In one embodiment, the protruding tooth has two oppositely disposed tooth side surfaces, and the tooth side surfaces of the protruding tooth are planes.

[0016] In this embodiment, a planar tooth side surface is adopted, so that the structure of the convex tooth is easy to process, which is beneficial to reducing the processing difficulty and processing cost.

[0017] In one embodiment, the tooth top surface of the convex tooth has a first transition surface, the first transition surface is arranged close to the tooth side surface, the first transition surface extends from the tooth top surface to the tooth side surface and is inclined toward the roller surface close to the second roller body.

[0018] In this embodiment, a first transition surface is formed at the position where the tooth top surface is connected to the tooth side surface, thereby reducing stress concentration when the convex tooth is squeezed against the surface of the tab. In addition, the first transition surface is provided so that the bottom surface of the extruded concave structure is a non-planar surface with concave and convex surfaces, thereby increasing the stiffness of the concave structure and further improving the tab's anti-deformation ability.

[0019] In one embodiment, the second roller body has a first end face along the axial direction of the second roller body; the tooth top face of the convex tooth has a second transition face, the second transition face is arranged close to the first end face, and the second transition face extends from the tooth top face to the first end face and is inclined toward the roller surface close to the second roller body.

[0020] In this embodiment, it is helpful to reduce the stress concentration phenomenon at the connection position between the convex teeth and the roller surface. The concave structure pressed out by the convex teeth is not prone to stress dead corners. The connection position between the bottom and the side of the concave structure has a smooth transition, and the side is inclined, which is helpful to improve the structural stability, thereby improving the deformation resistance of the concave structure and the tab.

[0021] In one embodiment, along the axis direction of the second roller body, the second roller body has a first end face and a second end face opposite to each other, one end of the protruding tooth extends to the first end face, and the other end of the protruding tooth is spaced apart from the second end face.

[0022] In this embodiment, one end of the protruding tooth is spaced apart from one end of the second roller body, so that the second roller body forms a roller surface with an outer edge outside the extended end of the protruding tooth. This roller surface can not only protect the pole piece, but also play a positioning role during the rotation of the second roller body, thereby improving the stability of the second roller body during the rotation process.

[0023] In one embodiment, each of the protruding teeth is extended along a first direction, and an angle between the first direction and the axis direction of the second roller body is in a range of 0°-90°.

[0024] In this embodiment, the extension direction of the convex teeth on the second roller body can be parallel, perpendicular or inclined to the axis of the second roller body, making the extension direction of the convex teeth more flexible, thereby making the styles of the concave structures formed on the tabs more diverse.

[0025] In one embodiment, each of the protruding teeth is extended in a direction parallel to the axis of the second roller body.

[0026] In this embodiment, the extension direction of the convex teeth is parallel to the axial direction of the second roller body, so that the extruded concave structure is not prone to irregular warping of the pole ear during the winding of the pole sheet. In the process of winding the pole sheet into an electrode assembly, the shape of the pole ear is more stable and the consistency of the shape is improved.

[0027] In one embodiment, two second rollers are provided. Along the axis direction of the first roller, the two second rollers are respectively arranged close to two ends of the first roller.

[0028] In this embodiment, two second rollers are provided to achieve simultaneous rolling of a pole piece with two pole tabs, which is beneficial to improving processing efficiency.

[0029] In one embodiment, the second roller is used for rolling the tab, and the tab has a first surface and a second surface that are oppositely disposed. The first surface is a polished surface, and the first surface is oppositely disposed to the second roller.

[0030] In this embodiment, the roller surface of the second roller body is brought into contact with the first surface of the tab, so that a concave structure is formed on the first surface of the tab, thereby further reducing the risk of bending and deformation of the tab.

[0031] In one embodiment, the rolling device also includes a power mechanism, the frame includes a first frame and a second frame, the first roller body rotates around its own axis and is connected to the first frame, the second roller body rotates around its own axis and is connected to the second frame, the first frame is movably connected to the second frame, and the power mechanism is connected to the second frame to drive the second frame to move relative to the first frame, so that the second roller body moves closer to or away from the first roller body.

[0032] In this embodiment, a first frame is provided to carry the first roller, a second frame is provided to carry the second roller, and a power mechanism is provided so that the power mechanism drives the first frame to carry the second roller to move, thereby achieving the purpose of moving the second roller closer to or away from the first roller, thereby adjusting the squeezing force of the second roller on the pole ear, and adjusting the depth of the concave structure on the pole ear, thereby achieving the effect of adjusting the anti-deformation ability of the pole ear, making the use of this device more flexible.

[0033] In one embodiment, a rubber cover layer is formed on the roller surface of the first roller.

[0034] In this embodiment, the rubber coating layer is beneficial to increasing the friction between the first roller and the pole piece, so that the first roller and the pole piece are not easy to slip, and has a protective effect on the surface of the pole piece.

[0035] In one embodiment, the surface of the second roller is coated with a protective layer, and the protective layer at least includes chromium material.

[0036] In this embodiment, a protective layer containing chromium material is provided on the surface of the second roller body to reduce the risk of corrosion of the roller surface of the second roller body and improve the wear resistance of the roller surface, thereby achieving the purpose of protecting the second roller body.

[0037] In a second aspect, the present application provides a battery production device, which includes a rolling device as described above.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1 Schematic diagram of the structure of the rolling device provided in some embodiments of the present application Figure 1 ;

[0041] Figure 2 for Figure 1 AA section view;

[0042] Figure 3 for Figure 1 Axonometric Figure 1 ;

[0043] Figure 4 for Figure 1 Axonometric Figure 2 ;

[0044] Figure 5 Schematic diagram of the structure of the convex teeth in the rolling device provided in some embodiments of the present application Figure 1 ;

[0045] Figure 6 for Figure 5 Axonometric drawing of

[0046] Figure 7 for Figure 5 Magnified view of position B in the middle;

[0047] Figure 8 for Figure 5 CC cross-sectional view;

[0048] Figure 9 for Figure 8 Enlarged view of the middle D position;

[0049] Figure 10 for Figure 8 Enlarged view of position E in the middle;

[0050] Figure 11 Schematic diagram of the structure of the convex teeth in the rolling device provided in some embodiments of the present application Figure 2 .

[0051] Description of reference numerals:

[0052] 1000, rolling device; 1100, frame; 1110, first frame; 1111, first connecting plate; 1112, first end plate; 1113, base; 1114, first rotating shaft; 1120, second frame; 1121, second connecting plate; 1122, second end plate; 1223, second rotating shaft; 1200, first roller; 1300, second roller; 1310, convex tooth; 1311, tooth top surface; 1312, tooth side surface; 1313, first transition surface; 1314, second transition surface; 1320, first end surface; 1330, second end surface; 1340, spacing area; 1400, driving mechanism; 1500, power mechanism; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0056] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0058] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0060] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0061] In the battery production process, the production of pole pieces is an extremely critical step. The pole pieces are formed on the pole pieces, and when the pole pieces are die-cut, slit or wound, the pole pieces are prone to bending problems. For example, during the production process, after the pole pieces are cut and formed, they are impacted by external forces and the stress of the pole pieces themselves is released, causing some of the pole pieces to bend. After passing through the winding process of the winder, the bending state is more obvious, and some of the pole pieces are bent into the diaphragm, causing a large number of winding cores to need to be repaired. The repaired batteries are prone to abnormalities such as short circuits and increased internal resistance, which affects the production quality of the battery and affects the quality and yield of the battery.

[0062] Therefore, the present application provides a rolling device 1000, in which a first roller body 1200 and a second roller body 1300 that cooperate with each other are provided. The pole piece can move relative to the first roller body 1200 and the second roller body 1300 between the first roller body 1200 and the second roller body 1300, and the second roller body 1300 can squeeze the pole tab on the pole piece. A convex tooth 1310 is formed on the second roller body 1300, so that a concave indentation can be formed on the pole tab, thereby enhancing the rigidity of the pole tab and helping to reduce the risk of deformation of the pole tab; the shape of the convex tooth 1310 is configured to gradually extend from the middle to both ends, so that the indentation formed gradually shrinks from the middle to both ends, which helps to reduce stress concentration. In addition, the design of the convex tooth 1310 gradually extending from the middle to both ends makes the concave area and the convex area on the pole tab more evenly distributed, which helps to enhance the anti-deformation ability of the pole tab.

[0063] It should be noted that the rolling device 1000 is not limited to extruding the tabs on the pole pieces. The rolling device 1000 can be applied to extrude various types of sheet structures to form concave structures, thereby enhancing the rigidity of the sheet structures.

[0064] In this embodiment, the rolling of the tabs on the pole piece is taken as an example for explanation. Specifically, according to some embodiments of the present application, referring to Figure 1 and Figure 2 As shown, Figure 1 FIG. 1 shows a schematic structural diagram of a rolling device 1000 in one embodiment. Figure 2 for Figure 1 AA cross-sectional view, an embodiment of the present application provides a rolling device 1000, the rolling device 1000 includes a frame 1100, a first roller body 1200 and a second roller body 1300; the first roller body 1200 is rotatably connected to the frame 1100; the second roller body 1300 is rotatably connected to the frame 1100, and the second roller body 1300 is arranged opposite to the first roller body 1200; a plurality of convex teeth 1310 are convexly provided on the roller surface of the second roller body 1300, and the plurality of convex teeth 1310 are arranged at intervals around the axis of the second roller body 1300, and along the length direction in which the convex teeth 1310 extend, the width of the convex teeth 1310 tends to gradually decrease from the middle to both ends.

[0065] Among them, the tabs are formed on the pole pieces. Generally, the tabs are formed on the width edges of the strip-shaped pole pieces. The tabs can be connected to the width edges of the pole pieces by die-cutting or welding.

[0066] Combine Figure 3 and Figure 4 As shown, the first roller 1200 has a cylindrical outer shape, and the axis of the first roller 1200 serves as the rotation axis. The first roller 1200 is connected to the frame 1100, which can be rotatable around its axis. The frame 1100 can be a frame, plate, or solid structure, and is used to support the first roller 1200. An external force can act on the first roller 1200, thereby forming the first roller 1200 as an active roller. Alternatively, the first roller 1200 and the second roller 1300 can both serve as driven rollers. An external force can act on the pole pieces, causing the pole pieces to move. The friction between the pole pieces and the first roller 1200 and the second roller 1300, respectively, causes the first roller 1200 and the second roller 1300 to rotate relative to the frame 1100.

[0067] Combine Figure 3 and Figure 4 As shown, the second roller 1300 has a cylindrical outer shape. The axis of the second roller 1300 serves as the rotation axis. The second roller 1300 is connected to the frame 1100 so as to rotate around its axis. The frame 1100 is also used to support the second roller 1300. The second roller 1300 is arranged relative to the first roller 1200, meaning that the axis of the second roller 1300 is arranged parallel to the axis of the first roller 1200, and the roller surfaces of the first roller 1200 and the second roller 1300 are spaced apart. When the electrode sheet and the tab thereon pass through the roller surface of the first roller 1200, the roller surface of the second roller 1300 can jointly clamp the tab, thereby enabling the second roller 1300 to exert a compressive force on the tab.

[0068] Specifically, the roller surface of the second roller 1300 is provided with a plurality of protruding teeth 1310. Each protruding tooth 1310 is formed by the roller surface protruding outward in a direction away from the roller surface. Each protruding tooth 1310 extends along the roller surface of the second roller 1300 by a predetermined length. The protruding teeth 1310 are spaced apart and arranged around the axis of the second roller 1300. In other words, the protruding teeth 1310 are spaced apart and arranged around the roller surface of the second roller 1300. When the second roller 1300 compresses the tab, the protruding teeth 1310 on the roller surface abut and compress the tab surface, thereby forming a concave structure on the tab surface. The concave structure can be understood as a groove structure.

[0069] Among them, reference Figure 5 and Figure 6 as well as Figure 7 As shown, the shape of the convex tooth 1310 is that along the length direction of the convex tooth 1310 (which can be considered as the extension direction of the convex tooth), the convex tooth 1310 shows a trend of gradually decreasing from the middle to the two ends, that is, the convex tooth 1310 is gradually extended from the middle to the two ends, so that the width of the middle position of the convex tooth 1310 is greater than the width of the two ends of the convex tooth 1310, and the width of the convex tooth 1310 gradually decreases from the middle position to the two ends. The width of the convex tooth 1310 refers to the extension length of the convex tooth 1310 perpendicular to the extension direction, which can also be referred to as the tooth width. It can be seen that the tooth width of the convex tooth 1310 adopts a gradual design, and the tooth width of the convex tooth 1310 gradually decreases from the middle position of the convex tooth 1310 toward the two ends. It can be seen that the concave structure formed by rolling the convex tooth 1310 is the same as the shape of the convex tooth 1310, and the concave structure with a gradual shape is beneficial to reducing the stress concentration phenomenon.

[0070] Taking the first roller 1200 as an example, the second roller 1300 is arranged above the first roller 1200. Figure 1 and Figure 2As shown, when the rolling device 1000 is in use, the pole piece is transported to the top of the first roller body 1200 and contacts the roller surface of the first roller body 1200, and the pole ear is located between the first roller body 1200 and the second roller body 1300, and the two surfaces of the pole ear are respectively in contact with the roller surface of the first roller body 1200 and the roller surface of the second roller body 1300. The external force causes the first roller body 1200 to rotate, thereby moving the pole piece, or the external force directly acts on the pole piece to actively move the pole piece. Due to the friction between the pole piece and the second roller body 1300, the second roller body 1300 rotates together, and the convex teeth 1310 on the surface of the second roller body 1300 continuously press on the pole ear. An inward concave structure is extruded, and the surface of the tab passing between the first roller body 1200 and the second roller body 1300 is covered with regularly arranged inward concave structures; the shape of the convex teeth 1310 is gradually reduced from the middle position to both ends, so the inward concave structure extruded by the convex teeth 1310 is also in the shape of a strip that gradually extends from the middle position to both ends, and a convex structure that gradually expands and extends from the middle position to both ends is formed between the two adjacent concave structures. The shapes of the concave structure and the convex structure form a complementary combination, and the roller surface area occupied by the concave structure is closer to the roller surface area occupied by the convex structure, which is more conducive to improving the stiffness of the tab, and then improving the tab's anti-deformation ability.

[0071] In this embodiment, a plurality of convex teeth 1310 are protruded on the second roller body 1300, and the convex teeth 1310 are used to roll the surface of the pole ear, thereby forming a concave structure on the surface of the pole ear, which is beneficial to increase the stiffness of the pole ear and improve the anti-deformation ability of the pole ear; furthermore, the shape of the convex teeth 1310 is gradually extended from the middle to the two ends, which is beneficial to reduce the stress concentration phenomenon, and makes the area area of ​​the concave structure rolled out on the pole ear and the area area of ​​the convex structure more balanced, which is beneficial to further improve the anti-deformation ability of the pole ear.

[0072] In some embodiments, reference Figure 1 As shown, the rolling device 1000 further includes a driving mechanism 1400 , which is connected to the first roller body 1200 to drive the first roller body 1200 to rotate.

[0073] Specifically, the first roller 1200 is connected to the drive mechanism 1400. Therefore, it can be seen that the drive mechanism 1400 is used to drive the first roller 1200 to rotate about its own axis. The first roller 1200 is the active roller in the rolling device 1000. During use, the pole pieces and tabs can abut against the roller surface of the first roller 1200. The drive mechanism 1400 may include a combination of one or more of a motor, an electric motor, a gear transmission mechanism, a connecting rod mechanism, a pneumatic component, and a hydraulic component.

[0074] In this embodiment, a driving mechanism 1400 is provided to drive the first roller 1200 to rotate relative to the frame 1100. The first roller 1200 can serve as the power input part for the movement of the pole piece, and through the friction between the first roller 1200 and the pole piece, the pole piece is driven to move between the first roller 1200 and the second roller 1300.

[0075] In some embodiments, reference Figure 5-7 As shown, the protruding tooth 1310 has two oppositely disposed tooth side surfaces 1312, and the tooth side surfaces 1312 are arc-shaped curved surfaces.

[0076] Specifically, the convex tooth 1310 is extended on the roller surface of the second roller body 1300, so two oppositely arranged extended side surfaces are formed on both sides of the convex tooth 1310. The extended side surfaces are the tooth side surfaces 1312 of the convex tooth 1310. The tooth side surfaces 1312 extend along the arc curve so that the tooth side surfaces 1312 form an arc-shaped surface. Along the extension direction of the convex tooth 1310, the arc curve extends from the middle of the convex tooth 1310 to the two ends respectively and approaches the extension axis direction of the convex tooth 1310, thereby forming a structural form that gradually shrinks from the middle to both ends.

[0077] In this embodiment, the tooth side surface 1312 of the convex tooth 1310 is formed into an arc-shaped surface, so that the concave side wall of the concave structure extruded on the tab is curved, which is conducive to alleviating the stress concentration phenomenon and further improving the deformation resistance of the tab.

[0078] In some embodiments, reference Figure 5 and Figure 6 As shown, along the direction perpendicular to the outwardly protruding extension height of the protruding tooth 1310 , the outer contour of the cross section of the protruding tooth 1310 is elliptical.

[0079] Specifically, the cross-section of the convex tooth 1310 refers to the cross-section of the convex tooth perpendicular to the height direction of the convex extension of the convex tooth 1310. The outer contour of the cross-section of the convex tooth 1310 is elliptical. It can be understood that the extension direction (or length direction) of the convex tooth 1310 is the major axis direction of the ellipse, and the width direction of the convex tooth 1310 is the minor axis direction of the ellipse. The elliptical convex tooth 1310 increases the spacing distance between the extension ends of two adjacent convex teeth 1310. The area ratio of the concave part and the convex part on the surface of the pole ear squeezed by the convex tooth 1310 is closer, and the fusion and intersection of the concave part and the convex part are increased, which is conducive to improving the distribution balance between the concave part and the convex part, and is conducive to improving the deformation resistance of the pole ear. The elliptical tooth shape is more conducive to alleviating stress concentration.

[0080] In this embodiment, the use of elliptical protruding teeth 1310 is helpful in alleviating stress concentration, so that the area of ​​the concave portion of the tab is close to the area of ​​the convex portion, which is helpful in improving the tab's anti-deformation ability.

[0081] In some embodiments, the protruding tooth 1310 has two oppositely disposed tooth side surfaces 1312 , and the tooth side surfaces 1312 of the protruding tooth 1310 are planes.

[0082] Specifically, the tooth flank 1312 of the protruding tooth 1310 is a plane. It can be seen that the tooth flank 1312 extends along a straight line so that the tooth flank 1312 forms a plane. Along the extension direction of the protruding tooth 1310, the straight line extends from the middle of the protruding tooth 1310 to the two ends and approaches the extension axis of the protruding tooth 1310, thereby forming a structure that tapers from the middle to the two ends. For example, the cross-sectional circumferential outer contour of the protruding tooth 1310 is polygonal, such as a diamond. The two tooth flanks 1312 are designed with an arc transition at the location where the extended ends connect, forming a curved surface at the extended end of the protruding tooth 1310. This creates a smooth curved transition between the adjacent sidewalls of the concave structure extruded on the tab, which helps reduce stress concentration.

[0083] In this embodiment, a planar tooth side surface 1312 is adopted, so that the structure of the protruding tooth 1310 is easy to process, which is beneficial to reducing the processing difficulty and processing cost.

[0084] In some embodiments, reference Figure 7 As shown, the tooth top surface 1311 of the convex tooth 1310 has a first transition surface 1313, which is arranged close to the tooth side surface 1312. The first transition surface 1313 extends from the tooth top surface 1311 to the tooth side surface 1312 and is inclined toward the roller surface close to the second roller body 1300.

[0085] Specifically, the convex tooth 1310 has a tooth top surface 1311. The tooth top surface 1311 and the tooth flank surface 1312 together form the outer surface of the convex tooth 1310. The tooth top surface 1311 can be divided into a main top surface located in the center and a first transition surface 1313 located on the periphery of the main top surface and extending to the tooth flank surface 1312. The first transition surface 1313 is located at the edge of the tooth top surface 1311 near the tooth flank surface 1312. It can be seen that the first transition surface 1313 is an annular surface. The shape of the first transition surface 1313 is that the first transition surface 1313 extends from the position on the tooth top surface 1311 where it connects with the main top surface to the tooth flank surface 1312 and is inclined toward the roller surface of the second roller body 1300 (that is, the tooth root direction). It can be seen that the first transition surface 1313 is an inclined annular surface. The longitudinal cross-section of the first transition surface 1313 is a straight line or a curve. It can be understood that the extension line of the first transition surface 1313 extending from the main top surface toward the tooth side surface 1312 is a straight line or a curve. For example, the first transition surface 1313 is a part of a conical surface or a spherical surface.

[0086] The first transition surface 1313 and the main top surface on the tooth top surface 1311 can form an angle of 0°-30°, but excluding 0°. The larger the angle, the greater the inclination of the first transition surface 1313, and the smaller the angle, the smaller the inclination of the first transition surface 1313. The angle between the first transition surface 1313 and the main top surface on the tooth top surface 1311 can be any value in the range of 0°-30°, for example, the angle is 2°, 5°, 10°, 15°, 20°, 30°, etc.

[0087] In this embodiment, a first transition surface 1313 is formed at the position where the tooth top surface 1311 is connected to the tooth side surface 1312, so that stress concentration is reduced when the convex tooth 1310 is squeezed against the surface of the tab. In addition, the first transition surface 1313 is provided so that the bottom surface (or groove bottom surface) of the extruded concave structure is a non-planar surface with concave and convex surfaces, thereby increasing the rigidity of the concave structure and further improving the tab's anti-deformation ability.

[0088] In some embodiments, reference Figure 8-10 As shown, along the axial direction of the second roller body 1300, the second roller body 1300 has a first end face 1320; the tooth top surface 1311 of the convex tooth 1310 has a second transition surface 1314, and the second transition surface 1314 is arranged close to the first end face 1320. The second transition surface 1314 extends from the tooth top surface 1311 to the first end face 1320 and is inclined toward the direction of the roller surface close to the second roller body 1300.

[0089] Specifically, the second roller body 1300 is cylindrical. In other words, the second roller body 1300 is a cylinder, so it can be seen that the cylinder has an axis, and the two ends of the axis of the cylinder form two end surfaces, one of which is the first end surface 1320, and the other end surface opposite the first end surface 1320 is defined as the second end surface 1330. The first end surface 1320 and the second end surface 1330 are arranged opposite each other. The location where the first end surface 1320 and the second end surface 1330 connect to the roller surface is chamfered to reduce burrs. This allows for a smooth transition between the edges of the first end surface 1320 and the second end surface 1330 and the roller surface, which helps reduce stress concentration.

[0090] The protruding tooth 1310 extends from the roller surface of the second roller body 1300 and has two extended ends. One of the extended ends of the protruding tooth 1310 extends near the first end surface 1320 and can reach the position of the first end surface 1320. A second transition surface 1314 is formed in the area or position where the extended end of the protruding tooth 1310 is close to the first end surface 1320. This second transition surface 1314 is inclined toward the roller surface of the second roller body 1300, allowing the extended end of the protruding tooth 1310 to smoothly transition to the roller surface, thereby reducing the generation of stress dead zones. When the protruding tooth 1310 with the aforementioned shape is rolled on the surface of the tab, the sidewalls (or groove walls) of the resulting concave structure are inclined, which helps reduce stress concentration.

[0091] In this embodiment, one end of the convex tooth 1310 is extended obliquely toward the first end face 1320 of the second roller body 1300, which is beneficial to reducing the stress concentration phenomenon at the connection position between the convex tooth 1310 and the roller surface. The concave structure pressed out by the convex tooth 1310 is not prone to stress dead angles. The connection position between the bottom surface and the side surface (or side wall) of the concave structure has a smooth transition, and the side surface is inclined, which is beneficial to improving the structural stability, thereby improving the deformation resistance of the concave structure and the tab.

[0092] In some embodiments, reference Figure 5 and Figure 8 As shown, along the axis direction of the second roller body 1300 , the second roller body 1300 has a first end face 1320 and a second end face 1330 opposite to each other, one end of the protruding tooth 1310 extends to the first end face 1320 , and the other end of the protruding tooth 1310 is spaced apart from the second end face 1330 .

[0093] Specifically, the convex tooth 1310 is extended along the roller surface of the first roller body 1200, and the extension direction of the convex tooth 1310 is the length direction of the convex tooth 1310. Therefore, the convex tooth 1310 forms two extension ends. One extension end of the convex tooth 1310 extends to the first end face 1320 of the second roller body 1300. The end face of the extension end can be set flush with the first end face 1320. A spacing distance is formed between the other extension end of the convex tooth 1310 and the second end face 1330, so that the other end of the convex tooth 1310 is spaced from the second end face 1330, and a spacing area 1340 is formed.

[0094] Regarding the structure of the pole piece, the pole piece includes a tab and a pole piece body. The tab can be formed on the side of the pole piece body by die-cutting, or the tab can be connected to the side of the pole piece body by welding. When the protruding teeth 1310 are working, the spacing area 1340 is used to avoid the pole piece body portion on the side of the tab. Since the second roller body 1300 is used to press the tab, the protruding teeth 1310 extrude an inward concave structure on the surface of the tab. Therefore, it is only necessary to make the protruding teeth 1310 abut the surface of the tab. However, there is a risk of bulging at the connection point between the tab and the pole piece body during the extrusion process. Therefore, it is necessary to make the roller surface of the second roller body 1300 on the outer edge of the protruding teeth 1310 so that the roller surface of the second roller body 1300 can block the connection point between the tab and the pole piece body, thereby preventing the risk of bulging at this location and providing protection.

[0095] In addition, the provision of the spacing area 1340 enables the spacing area 1340 to play a role of avoidance when the thickness of the pole piece body is greater than the thickness of the pole tab, or when the surface of the pole piece body protrudes outside the surface of the pole tab.

[0096] Furthermore, the roller surface on the outer edge of the second roller body 1300 outside the convex teeth 1310 can also abut against the surface of the pole piece body when the convex teeth 1310 squeeze the pole piece, thereby playing a positioning role and improving the stability of the second roller body 1300 during rotation.

[0097] In this embodiment, one end of the protruding tooth 1310 is spaced apart from one end of the second roller body 1300, so that the second roller body 1300 forms a roller surface with an outer edge outside the extended end of the protruding tooth 1310. This roller surface can not only protect the pole piece, but also play a positioning role during the rotation of the second roller body 1300, thereby improving the stability of the rotation process of the second roller body 1300.

[0098] In some embodiments, reference Figure 5 and Figure 11As shown, each of the protruding teeth 1310 is extended along the first direction X, and the angle between the first direction X and the axis direction of the second roller body 1300 is in the range of 0°-90°.

[0099] Specifically, the first direction X is the extension direction of the convex tooth 1310, that is, the length direction of the convex tooth. Since the convex tooth 1310 extends along the roller surface of the second roller body 1300, and the roller surface is a cylindrical surface, it can be seen that the extension axis of the convex tooth 1310 is a straight line or a curve. Then the first direction X is the direction of the extension axis of the convex tooth 1310, or the tangent direction of the extension axis of the convex tooth 1310.

[0100] For example, the first direction X is set at a preset angle a with the axial direction of the second roller body 1300, and the range of the preset angle a is 0°-90°. The axial direction of the second roller body 1300 is defined as the second direction Y. It can be seen that the first direction X and the second direction Y are set at the preset angle a. Then, the preset angle a can take any value in the range of 0°-90°. For example, if the preset angle a is 0°, the extension direction of the convex tooth 1310 is parallel to the axial direction of the second roller body 1300. It can be understood that when the second roller body 1300 is placed vertically, the convex tooth 1310 is vertical on the roller surface of the second roller body 1300. The convex tooth 1310 designed above is more It is easy to process and manufacture. For another example, if the preset angle a is 45°, the tangent direction of a certain position on the extension axis of the convex tooth 1310 forms an angle of 45° with the axial direction of the second roller body 1300. It can be understood that when the second roller body 1300 is placed vertically, the convex tooth 1310 is inclined on the roller surface of the second roller body 1300. For another example, if the preset angle a is 90°, the tangent direction of a certain position on the extension axis of the convex tooth 1310 forms an angle of 90° with the axial direction of the second roller body 1300. It can be understood that when the second roller body 1300 is placed vertically, the convex tooth 1310 is in a horizontal ring shape on the roller surface of the second roller body 1300.

[0101] In this embodiment, the extension direction of the protruding teeth 1310 on the second roller body 1300 can be parallel, perpendicular or inclined to the axis of the second roller body 1300, making the extension direction design of the protruding teeth 1310 more flexible, thereby making the style of the concave structure formed on the tab more diverse.

[0102] In some embodiments, reference Figure 1-3 As shown, each protruding tooth 1310 is extended in a direction parallel to the axis of the second roller body 1300 .

[0103] Specifically, the convex teeth 1310 are arranged to extend along a straight line, which is parallel to the axis of the second roller body 1300, so that straight or straight strip-shaped convex teeth 1310 are formed on the surface of the second roller body 1300. That is to say, the preset angle a is 0°, then correspondingly, the extension direction of the concave structure pressed out on the pole ear will be parallel to the width direction of the pole piece, and the extension direction of the concave structure refers to the extension direction of the notch of the groove; when the pole piece is wound, the winding axis is parallel to the extension direction of the concave structure, then it can be seen that the bending axis of the pole piece and the pole ear is parallel to the extension direction of the concave structure, so that the pole ear is easier to bend synchronously and consistently, so as to be wound to form an electrode assembly, so that the pole ear is not prone to irregular warping and bending.

[0104] In this embodiment, the extension direction of the protruding teeth 1310 is parallel to the axial direction of the second roller body 1300, so that the extruded concave structure is not prone to irregular warping of the pole ear during the winding process of the pole sheet. In the process of winding the pole sheet into an electrode assembly, the shape of the pole ear is more stable and the consistency of the shape is improved.

[0105] In some embodiments, reference Figure 1-3 As shown, two second roller bodies 1300 are provided. Along the axis direction of the first roller body 1200 , the two second roller bodies 1300 are respectively arranged close to the two ends of the first roller body 1200 .

[0106] Generally, a pole piece has tabs formed at both ends in the width direction (that is, on both sides in the length direction of the pole piece). Therefore, by providing two second rollers 1300, the pole pieces at both ends can be rolled simultaneously. It should be noted that if the number of tabs on the pole piece is more than two, the number of second rollers 1300 is not limited to two. The number of second rollers 1300 can be more than two. One second roller 1300 can be provided corresponding to one pole tab, or multiple second rollers 1300 can be provided corresponding to one pole tab.

[0107] Specifically, taking the example of two second rollers 1300, the two second rollers 1300 are respectively arranged opposite to the two pole ears at both ends of the pole piece. For example, one second roller 1300 is correspondingly arranged above a pole piece. After the pole piece is transported to the top of the first roller 1200, each pole ear is clamped between the corresponding second roller 1300 and the first roller 1200. The first roller 1200 rotates to move the pole piece. The friction force causes the two second rollers 1300 to rotate, and the two second rollers 1300 roll the two pole ears respectively.

[0108] The two second rollers 1300 are both rotatably connected to the frame 1100. The two second rollers 1300 can be rotatably connected to the frame 1100 respectively through a rotating shaft, or the two second rollers 1300 can be rotatably connected to the frame 1100 through a rotating shaft. Setting a common rotating shaft is conducive to improving the consistency of the rotation of the second rollers 1300, reducing the asynchronous rotation of the two second rollers 1300, and reducing the pulling problem on the surface of the tab.

[0109] In this embodiment, by providing two second rollers 1300 , the pole piece with two pole tabs can be rolled simultaneously, which is beneficial to improving the processing efficiency.

[0110] In some embodiments, reference Figure 1 、 Figure 2 as well as Figure 3 As shown, the rolling device 1000 also includes a power mechanism 1500, the frame 1100 includes a first frame 1110 and a second frame 1120, the first roller 1200 rotates around its own axis and is connected to the first frame 1110, the second roller 1300 rotates around its own axis and is connected to the second frame 1120, the first frame 1110 is movably connected to the second frame 1120, and the power mechanism 1500 is connected to the second frame 1120 to drive the second frame 1120 to move relative to the first frame 1110, so that the second roller 1300 moves closer to or away from the first roller 1200.

[0111] Specifically, refer to Figure 1 and Figure 2 As shown, the first frame 1110 and the second frame 1120 can each adopt any one of a frame structure, a plate structure, or a solid structure. The first frame 1110 is movably connected to the second frame 1120. For example, the first frame 1110 and the second frame 1120 are slidably connected. The first frame 1110 is provided with a sliding hole or a sliding groove, and the second frame 1120 is formed with a sliding protrusion, which is plugged into the sliding hole or the sliding groove. The power mechanism 1500 can adopt a combination of one or more of a motor, an electric motor, a gear transmission assembly, a connecting rod assembly, a pneumatic assembly, and a hydraulic assembly. The power output end of the power mechanism 1500 is connected to the second frame 1120, thereby driving the second frame 1120 to move relative to the first frame 1110. During the movement of the second frame 1120, the second roller 1300 connected to the second frame 1120 moves closer to or away from the first roller 1200, thereby achieving the purpose of adjusting the distance between the roller surface of the second roller 1300 and the roller surface of the first roller 1200.

[0112] Reference Figure 3As shown, the first frame 1110 may include two first end plates 1112 and a first connecting plate 1111 connected between the two first end plates 1112. A first rotating shaft 1114 is connected between the two first end plates 1112. A first insertion hole is formed in the middle portion of the first roller 1200 along the axial direction. The first rotating shaft 1114 is inserted into the first insertion hole, and the first roller 1200 is rotatably connected to the first rotating shaft 1114. The two first end plates 1112 and the first connecting plate 1111 are connected to form a groove-shaped space. The first frame 1110 may also include a base 1113, so that the two first end plates 1112 are connected to the base 1113, and the base 1113 supports the two first end plates 1112.

[0113] Reference Figure 3 As shown, the second frame 1120 includes two second end plates 1122 and a second connecting plate 1121 connected between the two second end plates 1122, a second rotating shaft 1223 is connected between the two second end plates 1122, a second plug-in hole is formed in the middle part of the second roller body 1300 along the axial direction, the second rotating shaft 1223 is plugged into the second plug-in hole, and the second roller body 1300 is rotatably connected to the second rotating shaft 1223. The second frame 1120 is arranged in the groove-shaped space of the first frame 1110, and the second connecting plate 1121 is connected to a sliding shaft. The first connecting plate 1111 is provided with a sliding hole, and the sliding shaft is inserted and slidably connected in the sliding hole; the power mechanism 1500 is connected to the first connecting plate 1111, and the power output end of the power mechanism 1500 is connected to the sliding shaft, and the second frame 1120 is moved through the sliding shaft. For example, the second roller 1300 is located above the first roller 1200, and the second frame 1120 moves up and down relative to the first frame 1110.

[0114] In this embodiment, a first frame 1110 is provided to carry the first roller 1200, a second frame 1120 is provided to carry the second roller 1300, and a power mechanism 1500 is provided, so that the power mechanism 1500 drives the first frame 1110 to carry the second roller 1300 to move, so as to achieve the purpose of moving the second roller 1300 closer to or away from the first roller 1200, thereby adjusting the squeezing force of the second roller 1300 on the pole ear, and adjusting the depth of the concave structure on the pole ear, thereby achieving the effect of adjusting the anti-deformation ability of the pole ear, making the use of this device more flexible.

[0115] In some embodiments, a rubber coating layer is formed on the roller surface of the first roller body 1200 .

[0116] Specifically, the rubber coating can be made of rubber material, resin material, ethylene material, etc. The rubber coating is at least wrapped around the roller surface of the first roller body 1200 opposite to the second roller body 1300, or the rubber coating can be wrapped around the entire roller surface of the first roller body 1200 to facilitate processing and manufacturing.

[0117] The rubber coating is beneficial to increasing the friction coefficient of the roller surface of the first roller body 1200, thereby increasing the friction between the first roller body 1200 and the pole piece, reducing the risk of slipping between the pole piece and the surface of the first roller body 1200, and improving the stability of the pole piece transmission.

[0118] In this embodiment, the rubber coating layer is beneficial to increasing the friction between the first roller 1200 and the pole piece, so that the first roller 1200 and the pole piece are not easy to slip, and has a protective effect on the surface of the pole piece.

[0119] In some embodiments, the second roller 1300 is used to roll the tab. The tab has a first surface and a second surface that are oppositely disposed. The first surface is a polished surface, and the first surface is oppositely disposed to the second roller 1300 .

[0120] Taking the die-cut tab as an example, the tab is formed on the side edge of the pole piece by die-cutting. The pole piece as a whole can be made of copper foil. The copper foil has a bright side and a dark side. The bright side usually refers to the polished surface. For the tab, the tab has a first surface and a second surface relative to each other, wherein the first surface is a polished surface, that is, the bright side of the copper foil.

[0121] In actual applications, when winding, the tab is easily bent from the bright side to the dark side. Therefore, in this embodiment, the roller surface of the second roller body 1300 is abutted against the first surface (that is, the bright side) of the tab, so that a concave structure is formed on the first surface of the tab, which is more conducive to reducing the risk of bending and deformation of the tab.

[0122] In some embodiments, the surface of the second roller 1300 is coated with a protective layer, and the protective layer includes at least chromium material.

[0123] The second roller 1300 can be made of a metal material. The protective layer comprises at least chromium and has a thickness of 8-12 μm. The chromium forms a dense oxide film on the surface of the second roller 1300, which prevents further oxidation and protects the metal surface of the second roller 1300 from corrosion. The chromium oxide film is very thin and effectively isolates the metal from oxygen, moisture, and other corrosive substances in the environment. Furthermore, chromium has a high hardness, and the protective layer increases the wear resistance of the metal surface, reducing wear and scratching, thereby extending the service life of the metal material.

[0124] In this embodiment, a protective layer containing chromium material is provided on the surface of the second roller body 1300 to reduce the risk of corrosion of the roller surface of the second roller body 1300 and improve the wear resistance of the roller surface, thereby achieving the purpose of protecting the second roller body 1300.

[0125] According to some embodiments of the present application, the present application further provides a battery production device, which includes the rolling device 1000 in the above embodiment.

[0126] Specifically, the battery production process generally includes raw material preparation, electrode manufacturing, battery assembly, packaging, formation and testing. During the electrode manufacturing process, a winding device is required to wind the pole piece. Before the winding process, the pole piece needs to be rolled to form an inward concave structure on the pole ear, thereby enhancing the pole ear's anti-deformation ability.

[0127] The embodiment of the battery production equipment in this application is based on the embodiment of the above-mentioned rolling device 1000. The embodiment of the battery production equipment includes all the technical effects of the embodiment of the above-mentioned rolling device 1000, which will not be repeated here.

[0128] In a specific embodiment, referring to Figure 1-10As shown, the rolling device 1000 includes a frame 1100, a first roller 1200, and a second roller 1300; the first roller 1200 is rotatably connected to the frame 1100; the second roller 1300 is rotatably connected to the frame 1100, and the second roller 1300 is arranged opposite the first roller 1200; a plurality of protruding teeth 1310 are convexly provided on the roller surface of the second roller 1300, and the plurality of protruding teeth 1310 are spaced around the axis of the second roller 1300. Along the longitudinal direction of the protruding teeth 1310, the width of the protruding teeth 1310 gradually decreases from the middle to the ends. The rolling device 1000 further includes a driving mechanism 1400, which is connected to the first roller body 1200 to drive the first roller body 1200 to rotate; the convex tooth 1310 has two oppositely arranged tooth side surfaces 1312, and the tooth side surfaces 1312 are arc-shaped surfaces; along the direction perpendicular to the height of the outer convex extension of the convex tooth 1310, the cross-sectional outer contour of the convex tooth 1310 is elliptical; the tooth top surface 1311 of the convex tooth 1310 has a first transition surface 1313, and the first transition surface 1313 is arranged close to the tooth side surface 1312, and the first transition surface 1313 is from the tooth top surface 1311 to the tooth side surface 1312. The tooth side surface 1312 extends and is tilted toward the direction of the roller surface close to the second roller body 1300; along the axial direction of the second roller body 1300, the second roller body 1300 has a first end surface 1320; the tooth top surface 1311 of the convex tooth 1310 has a second transition surface 1314, and the second transition surface 1314 is arranged close to the first end surface 1320. The second transition surface 1314 extends from the tooth top surface 1311 to the first end surface 1320 and is tilted toward the direction of the roller surface close to the second roller body 1300; along the axial direction of the second roller body 1300, the second roller body 1300 has the same With respect to the first end face 1320 and the second end face 1330, one end of the protruding tooth 1310 extends to the first end face 1320, and the other end of the protruding tooth 1310 is spaced apart from the second end face 1330. Each protruding tooth 1310 extends in a direction parallel to the axis of the second roller body 1300. The diameter of the second roller body 1300 is 50 mm to 60 mm, the number of the protruding teeth 1310 is 40 to 50, and the height of the protruding teeth 1310 is 1 mm to 2 mm. For example, the diameter of the second roller body 1300 is 52 mm, the number of the protruding teeth 1310 is 43, and the height of the protruding teeth 1310 is 1.5mm, the length of the second roller 1300 is 50mm, the length of the protruding teeth 1310 is 37mm, and the transition extension length of the second transition surface 1314 is 7mm-8mm. The rolling device 1000 also includes a power mechanism 1500. The frame 1100 includes a first frame 1110 and a second frame 1120. The first roller 1200 is connected to the first frame 1110 for rotation about its axis. The second roller 1300 is connected to the second frame 1120 for rotation about its axis. The first frame 1110 is movably connected to the second frame 1120. The power mechanism 1500 is connected to the second frame 1120 to drive the second frame 1120 to move relative to the first frame 1110, causing the second roller 1300 to move closer to or away from the first roller 1200.

[0129] The above are merely preferred embodiments of the present application and only specifically describe the technical principles of the present application. These descriptions are intended only to explain the principles of the present application and should not be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application, as well as other specific implementations of the present application that can be conceived by those skilled in the art without inventive effort, shall be included within the scope of protection of the present application.

Claims

1. A rolling device (1000), characterized in that: include: Rack(1100); A first roller (1200) is rotatably connected to the frame (1100); The second roller body (1300) is rotatably connected to the frame (1100), the second roller body (1300) is arranged opposite to the first roller body (1200), and the axis of the second roller body (1300) is parallel to the axis of the first roller body (1200); a plurality of convex teeth (1310) are convexly provided on the roller surface of the second roller body (1300), and the plurality of convex teeth (1310) are arranged at intervals around the axis of the second roller body (1300), and along the longitudinal direction in which the convex teeth (1310) extend, the width of the convex teeth (1310) tends to gradually decrease from the middle to both ends.

2. The rolling device (1000) according to claim 1, characterized in that The rolling device (1000) further comprises a driving mechanism (1400), wherein the driving mechanism (1400) is connected to the first roller body (1200) to drive the first roller body (1200) to rotate.

3. The rolling device (1000) according to claim 1, characterized in that: The convex tooth (1310) has two oppositely arranged tooth side surfaces (1312), and the tooth side surfaces (1312) are arc-shaped curved surfaces.

4. The rolling device (1000) according to claim 3, characterized in that: Along a direction perpendicular to the outwardly protruding extension height of the protruding tooth (1310), the outer contour of the cross section of the protruding tooth (1310) is elliptical.

5. The rolling device (1000) according to claim 1, characterized in that: The protruding tooth (1310) has two tooth side surfaces (1312) arranged opposite to each other, and the tooth side surfaces (1312) of the protruding tooth (1310) are planes.

6. The rolling device (1000) according to any one of claims 3 to 5, characterized in that: The tooth top surface (1311) of the convex tooth (1310) has a first transition surface (1313), and the first transition surface (1313) is arranged close to the tooth side surface (1312). The first transition surface (1313) extends from the tooth top surface (1311) to the tooth side surface (1312) and is inclined toward the roller surface close to the second roller body (1300).

7. The rolling device (1000) according to any one of claims 1 to 5, characterized in that: Along the axial direction of the second roller body (1300), the second roller body (1300) has a first end face (1320); the tooth top face (1311) of the convex tooth (1310) has a second transition face (1314), and the second transition face (1314) is arranged close to the first end face (1320). The second transition face (1314) extends from the tooth top face (1311) to the first end face (1320) and is inclined toward the roller surface close to the second roller body (1300).

8. The rolling device (1000) according to any one of claims 1 to 5, characterized in that: Along the axial direction of the second roller body (1300), the second roller body (1300) has a first end face (1320) and a second end face (1330) opposite to each other, one end of the convex tooth (1310) extends to the first end face (1320), and the other end of the convex tooth (1310) is spaced apart from the second end face (1330).

9. The rolling device (1000) according to any one of claims 1 to 5, characterized in that: Each of the protruding teeth (1310) is extended along a first direction (X), and the angle between the first direction (X) and the axial direction of the second roller body (1300) is in the range of 0°-90°.

10. The rolling device (1000) according to claim 9, characterized in that: Each of the protruding teeth (1310) is extended in a direction parallel to the axis of the second roller body (1300).

11. The rolling device (1000) according to any one of claims 1 to 5, characterized in that: The rolling device (1000) comprises two second roller bodies (1300), and along the axial direction of the first roller body (1200), the two second roller bodies (1300) are respectively arranged close to the two ends of the first roller body (1200).

12. The rolling device (1000) according to any one of claims 1 to 5, characterized in that: The second roller (1300) is used for rolling the tab, and the tab has a first surface and a second surface that are arranged opposite to each other, the first surface is a polished surface, and the first surface is arranged opposite to the second roller (1300).

13. A battery production device, characterized in that: The battery production equipment comprises the rolling device (1000) according to any one of claims 1 to 12.

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