Tab bending device and battery cell winding equipment

Abstract

The utility model is applicable to the technical field of lithium battery production, and provides a pole ear bending device and a battery cell winding device, wherein the pole ear bending device comprises a main frame, a support roller and a clamping mechanism. The battery cell winding device comprises the above-mentioned pole ear bending device. Compared with the method of bending the pole ear by a mold in the prior art, when producing the battery cell, the pole piece passes through the support roller in sequence during the movement, and under the action of the clamping mechanism, the pole piece will be set close to the surface of the support roller when passing through the support roller. At the same time, a bending working part is also provided on the support roller, which can abut against the pole ear when the pole piece passes through the support roller, and the pole ear can be bent or pre-folded under the extrusion of the bending working part, so that the pole ear bending operation is more convenient and quick.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery production, and in particular relates to a tab bending device and a battery core winding device. Background Art

[0002] Lithium-ion batteries are batteries with high energy density and good environmental performance. They have the advantages of high energy, high reliability and good processability. Therefore, they are widely used in various portable electronic devices, electric vehicles and electrical equipment for energy storage power stations. Lithium-ion batteries include battery cells, and battery cells have tabs. Tabs refer to the parts that connect the battery cells and external devices. They are mainly used to connect the positive and negative electrodes of the battery cells to the outside world and build circuits to achieve the transmission of electrical energy. In the production process of battery cells, in order to meet the needs of battery assembly and use, it is usually necessary to bend the tabs of the battery cells. However, the existing battery cells have the problem of inconvenient tab bending during the production process, which seriously affects the production efficiency and assembly accuracy of the battery cells. Utility Model Content

[0003] The utility model aims to provide a tab bending device and a battery cell winding device, aiming to solve the technical problem of inconvenient tab bending in the production process of the battery cell in the prior art.

[0004] The utility model is implemented in this way. In a first aspect, a tab bending device is provided, comprising:

[0005] Main frame;

[0006] A support roller shaft is rotatably arranged on the main frame, used to abut against the pole piece and can rotate with the movement of the pole piece, and a bending working part is arranged on the support roller shaft, and the bending working part is used to abut against the pole ear on the pole piece when the pole piece passes through the support roller shaft to bend the pole ear;

[0007] The clamping mechanism is arranged on the main frame and is used for clamping the main body of the pole piece against the surface of the supporting roller shaft and making the pole ear on the pole piece abut against the bending working part.

[0008] In an optional embodiment, the bending working portion includes an annular component and a working inclined surface, the annular component is protruding from one end of the support roller shaft, and the annular component is arranged around the support roller shaft, the working inclined surface is arranged on the side of the annular component facing the other end of the support roller shaft, and the working inclined surface is arranged at an angle to the surface of the support roller shaft, and is used to abut against the pole ear passing through the working inclined surface to bend the pole ear.

[0009] In an optional embodiment, the working inclined surface comprises a conical surface, and the angle between the conical surface and the surface of the supporting roller is 90° to 150°.

[0010] In an optional embodiment, the clamping mechanism includes an adjusting bracket and a clamping roller, the adjusting bracket is arranged on the main frame, the clamping roller is rotatably arranged on the adjusting bracket, and the axis of the clamping roller is parallel to the axis of the supporting roller, and the clamping roller is used to clamp the pole piece when the pole piece passes through the supporting roller.

[0011] In an optional embodiment, the adjustment bracket is slidably connected to the main frame along a first direction, and the first direction is a direction perpendicular to the axis of the supporting roller shaft. A lifting unit is provided between the adjustment bracket and the main frame, and the lifting unit is used to drive the adjustment bracket to move along the first direction.

[0012] In an optional embodiment, the adjustment bracket includes a first support portion, a second support portion and a translation unit, the first support portion is slidably connected to the main frame along a first direction, and the second support portion is slidably connected to the first support portion along a second direction, the second direction is perpendicular to the first direction, the translation unit is arranged between the first support portion and the second support portion, and the translation unit is used to drive the first support portion to move along the second direction, and the pressure roller is rotatably connected to the second support portion.

[0013] In an optional embodiment, the main frame includes a fixed support portion, a movable support portion and a correction unit, the movable support portion is slidably connected to the fixed support portion along a third direction, and the third direction is a direction parallel to the axis of the support roller shaft, the correction unit is arranged between the fixed support portion and the movable support portion, and the correction unit is used to push the movable support portion to slide along the third direction.

[0014] In an optional embodiment, the correction unit includes a pushing screw and an elastic member, wherein the pushing screw is threadedly connected to the fixed support portion and has the freedom to rotate around its own axis relative to the fixed support portion, the end of the pushing screw abuts against the movable support portion, and the elastic member is arranged between the fixed support portion and the movable support portion, and is located on the side of the movable support portion away from the pushing screw, and the elastic member is used to apply a force to the movable support portion toward the pushing screw.

[0015] In an optional embodiment, the movable support portion is provided with a sliding guide member arranged along the axial direction of the support roller shaft, and the fixed support portion is also provided with a guide structure for slidingly cooperating with the sliding guide member, and the movable support portion is slidably arranged on the fixed support portion along a preset path through the sliding guide member and the guide structure.

[0016] In a second aspect, a battery cell winding device is provided, comprising a tab bending device as described in any one of the above items.

[0017] The technical effect of the first aspect of the utility model is: by rotating a support roller on the main frame, the support roller can abut against the pole piece and rotate with the movement of the pole piece, and at the same time, at least part of the pole piece can be pressed by a clamping mechanism, so that the pole piece can be set close to the surface of the support roller. A bending working part is set on the support roller, and the bending working part is used to abut against the pole ear passing through the bending working part and squeeze the pole ear to bend the pole ear. Compared with the method of bending the pole ear on the pole piece by a mold in the prior art, the pole ear bending device can pass through the support roller in sequence during the movement of the pole piece, and under the action of the clamping mechanism, the main body of the pole piece will be set close to the surface of the support roller when the pole piece passes through the support roller. At the same time, a bending working part is also set on the support roller, which can abut against the pole ear when the pole piece passes through the support roller, and the pole ear can be bent or pre-folded under the squeezing of the bending working part during the movement of the pole piece. The pole ear bending operation is made more convenient and quick, and the efficiency of pole ear bending during battery cell production is improved.

[0018] It can be understood that the beneficial effects of the second aspect mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a tab bending device provided in an embodiment of the utility model;

[0021] Figure 2 It is a schematic cross-sectional structural diagram of a tab bending device provided by an embodiment of the utility model;

[0022] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 4 It is a structural schematic diagram of a battery cell winding device provided in an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 100, tab bending device; 200, negative electrode sheet feeding group; 300, positive electrode sheet feeding group; 400, first diaphragm feeding group; 500, second diaphragm feeding group; 600, winding mechanism;

[0026] 1. Main frame; 11. Fixed support part; 12. Movable support part; 13. Correction unit; 131. Push screw; 132. Elastic member; 14. Sliding unit; 141. Sliding block; 142. Slide rail; 15. Sliding guide; 2. Support roller; 3. Bending working part; 31. Annular part; 32. Working inclined surface; 4. Clamping mechanism; 41. Adjustment bracket; 411. First support part; 412. Second support part; 413. Translation unit; 42. Clamping roller; 43. Lifting unit. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", 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 present invention 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 present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] Please refer to Figures 1 to 4 As shown, in the embodiment of the utility model, in the first aspect, a pole ear bending device is provided, comprising a main frame 1, a support roller 2 and a clamping mechanism 4. The support roller 2 is rotatably arranged on the main frame 1, used to abut against the pole piece and can rotate with the movement of the pole piece, and a bending working part 3 is arranged on the support roller 2, and the bending working part 3 is used to abut against the pole ear on the pole piece when the pole piece passes through the support roller 2 to bend the pole ear. The clamping mechanism 4 is arranged on the main frame 1, used to press the main body of the pole piece against the surface of the support roller 2, and make the pole ear on the pole piece abut against the bending working part 3.

[0033] Specifically, the main frame 1 refers to a supporting component with a certain volume, and the main frame 1 can be a single component or a combination of multiple components. The support roller 2 refers to a shaft with a certain length, and the support roller 2 can rotate around its own axis. The axis of the support roller 2 is generally parallel to the pole piece and perpendicular to the movement direction of the pole piece. The bending working part 3 refers to a component with a certain volume, and the bending working part 3 is arranged on the support roller 2. It can be a separate component from the support roller 2, or it can be integrally formed with the support roller 2. The bending working part 3 can be a single component, or it can be composed of multiple components arranged at intervals along the circumference of the support roller 2. The clamping mechanism 4 refers to a component that clamps an object.

[0034] The pole ear bending device provided by the embodiment of the utility model is provided with a support roller 2 rotatably arranged on the main frame 1, and the support roller 2 can abut against the pole piece and rotate with the movement of the pole piece, and at least part of the pole piece can be pressed by the pressing mechanism 4, so that the pole piece can be set close to the surface of the support roller 2. A bending working part 3 is arranged on the support roller 2, and the bending working part 3 is used to abut against the pole ear passing through the bending working part 3 and squeeze the pole ear to bend the pole ear. Compared with the method of bending the pole ear on the pole piece by a mold in the prior art, the pole ear bending device can pass through the support roller 2 in sequence during the movement of the pole piece, and under the action of the pressing mechanism 4, the pole piece will be set close to the surface of the support roller 2 when passing through the support roller 2. At the same time, a bending working part 3 is also arranged on the support roller 2, which can abut against the pole ear when the pole piece passes through the support roller 2, and bend or pre-fold the pole ear under the pressure of the bending working part 3. The tab bending operation is made more convenient and quick, and the efficiency of tab bending during battery cell production is improved.

[0035] In addition, the tab bending device can also be arranged on the movement path of the pole piece before the pole piece is wound into a battery cell to pre-bend the tab of the pole piece, thereby avoiding the difficulty of bending caused by uneven arrangement of the tabs on the pole piece after the pole piece is wound into a battery cell structure, making the bending of the tab more convenient.

[0036] In one embodiment, see Figure 2 and Figure 3 The bending working part 3 includes an annular component 31 and a working inclined surface 32. The annular component 31 is convexly arranged at one end of the supporting roller shaft 2, and the annular component 31 is arranged around the supporting roller shaft 2. The working inclined surface 32 is arranged on the side of the annular component 31 facing the other end of the supporting roller shaft 2. The working inclined surface 32 is arranged at an angle with the surface of the supporting roller shaft 2, and is used to abut against the pole ear passing through the working inclined surface 32 to bend the pole ear. Specifically, the annular component 31 refers to an annular component with a certain height dimension, and the annular component 31 is arranged around the supporting roller shaft 2. The cross section of the annular component 31 can be semicircular, trapezoidal or triangular, etc., wherein the cross section refers to the plane intercepted by the plane passing through the axis of the supporting roller shaft 2. The working inclined surface 32 refers to a surface structure with a certain area, and the working inclined surface 32 is generally connected to the surface of the supporting roller shaft 2. The working inclined surface 32 can be a plane structure or a curved surface structure. The working inclined surface 32 can be continuously arranged in the circumferential direction around the supporting roller shaft 2, or can be arranged at intervals according to the distribution of the pole ears. An annular component 31 is protruded from one end of the support roller 2, and a working inclined surface 32 which is at an angle to the surface of the support roller 2 is provided on the side of the annular component 31 facing the other end of the support roller 2. When the pole piece passes through the support roller 2, the working inclined surface 32 can be used to squeeze the pole ear so that the pole ear is forced to bend, thereby realizing the bending of the pole ear, making the bending of the pole ear more convenient.

[0037] In an alternative embodiment, see Figure 1 The annular component 31 can be an integrally formed structure with the support roller shaft 2. The annular component 31 and the support roller shaft 2 can be integrally formed by injection molding, die casting or casting, or the annular component 31 and the support roller shaft 2 can also be integrally formed by machining.

[0038] In one embodiment, see Figure 3 , the working inclined surface 32 includes a conical surface, and the angle B between the conical surface and the surface of the support roller shaft 2 is 90° to 150°. Specifically, the conical surface usually refers to the surface of the cone except the bottom surface and the top surface. By setting the working inclined surface 32 as a conical surface, the angle B between the working inclined surface 32 and the surface of the support roller shaft 2 can be kept consistent everywhere in the axial direction of the support roller shaft 2, so that the bending angle of the pole ear on the pole piece is kept consistent. At the same time, the angle B between the conical surface and the surface of the support roller shaft 2 is 90° to 150°, so that the bending effect of the pole ear is better.

[0039] In one embodiment, see Figure 1 or Figure 2 The clamping mechanism 4 includes an adjusting bracket 41 and a clamping roller 42. The adjusting bracket 41 is arranged on the main frame 1. The clamping roller 42 is rotatably arranged on the adjusting bracket 41, and the axis of the clamping roller 42 is parallel to the axis of the supporting roller 2. The clamping roller 42 is used to clamp the pole piece when the pole piece passes through the supporting roller 2. Specifically, the clamping roller 42 refers to a shaft body with a certain length. The clamping roller 42 can rotate around its own axis, and the axis of the clamping roller 42 is parallel to the axis of the supporting roller 2. The adjusting bracket 41 refers to a supporting component with a certain volume. The adjusting bracket 41 can be a single component or a combination of multiple components. By arranging the adjusting bracket 41 on the main frame 1, and rotatably arranging the clamping roller 42 on the adjusting bracket 41, and the axis of the clamping roller 42 is parallel to the axis of the supporting roller 2. By providing the pressing roller 42 , the pole piece can be pressed when the pole piece passes through the supporting roller 2 , so that the bending of the pole ear on the pole piece can be more convenient and quick.

[0040] In an alternative embodiment, see Figure 2 and Figure 3 , one end of the pressing roller 42 is flush or nearly flush with the end of the annular component 31 provided on the supporting roller 2. By making one end of the pressing roller 42 flush or nearly flush with the end of the annular component 31 provided on the supporting roller 2, it is ensured that the position of the main body of the pole piece close to the pole ear is pressed, and it is prevented that the bending working part 3 also bends part of the main body when squeezing the pole ear on the pole piece, so that the bending position of the pole ear is more accurate.

[0041] Also, see Figure 2 The length of the pressing roller 42 can be smaller than the length of the supporting roller 2, which can reduce the manufacturing cost of the pressing roller 42 while ensuring the pole piece pressing effect.

[0042] In one embodiment, see Figure 1 or Figure 2, the adjusting bracket 41 is connected to the main frame 1 in a sliding manner along the first direction C, and the first direction C is a direction perpendicular to the axis of the supporting roller 2. A lifting unit 43 is provided between the adjusting bracket 41 and the main frame 1, and the lifting unit 43 is used to drive the adjusting bracket 41 to move along the first direction C. Specifically, the adjusting bracket 41 is connected to the main frame 1 in a sliding manner, which means that the adjusting bracket 41 can slide relative to the main frame 1. The lifting unit 43 refers to a component that drives an object to move. The lifting unit 43 can be a cylinder, a hydraulic cylinder, or an electric push rod, etc., and the lifting unit 43 can also be a screw structure, etc. By slidingly connecting the adjusting bracket 41 to the main frame 1, and driving the adjusting bracket 41 to move along the first direction C through the lifting unit 43. Therefore, when the pole piece is installed, the lifting unit 43 can drive the adjusting bracket 41 and the pressing roller 42 to move in the first direction C away from the supporting roller 2, so that the pole piece can pass through the gap between the pressing roller 42 and the supporting roller 2. After the pole piece is installed in place, the lifting unit 43 drives the adjustment bracket 41 and the clamping roller 42 to move in the first direction C toward the support roller 2, so that the clamping roller 42 presses the pole piece against the surface of the support roller 2, which can make the use of the entire clamping mechanism 4 more convenient, thereby improving the convenience of using the entire clamping mechanism 4.

[0043] In an alternative embodiment, see Figure 2 The lifting unit 43 includes a lifting cylinder, the main body of the lifting cylinder is installed on the main frame 1, and the driving end of the lifting cylinder can be connected to the adjusting bracket 41.

[0044] In one embodiment, see Figure 1 or Figure 2The adjustment bracket 41 includes a first support portion 411, a second support portion 412 and a translation unit 413. The first support portion 411 is slidably connected to the main frame 1 along a first direction C, and the second support portion 412 is slidably connected to the first support portion 411 along a second direction D, the second direction D is perpendicular to the first direction C, the translation unit 413 is arranged between the first support portion 411 and the second support portion 412, and the translation unit 413 is used to drive the first support portion 411 to move along the second direction D, and the clamping roller 42 is rotatably connected to the second support portion 412. Specifically, the first support portion 411 and the second support portion 412 both refer to support components with a certain volume, the first support portion 411 is slidably connected to the main frame 1 along the first direction C, and the lifting unit 43 is also arranged between the first support portion 411 and the main frame 1. The second support part 412 is connected to the first support part 411 by sliding along the second direction D, and the clamping roller 42 is connected to the second support part 412 by rotation. The clamping roller 42 can slide along the second direction D with the second support part 412 while rotating. The translation unit 413 refers to a component used to drive the object to move. The translation unit 413 can be a cylinder, an electric push rod or a hydraulic cylinder, etc. The translation unit 413 can also be a screw structure, wherein the screw structure can be driven manually or by a motor. By connecting the second support part 412 to the first support part 411 by sliding along the second direction D, and providing the translation unit 413 between the first support part 411 and the second support part 412, the position of the second support part 412 and the clamping roller 42 along the second direction D can be adjusted by the translation unit 413 according to the position of the pole piece, so that the use of the clamping mechanism 4 is more convenient and the clamping position is also kept accurate.

[0045] In an alternative embodiment, see Figure 1 or Figure 2 A sliding structure is provided between the first support portion 411 and the main body 1. The sliding structure may be a slider rail structure or a roller rail structure. The provision of the sliding structure may make the sliding of the first support portion 411 and the main body 1 more convenient.

[0046] In another alternative embodiment, see Figure 1 or Figure 2The translation unit 413 includes a translation screw, the first end of which is threadedly connected to the first support portion 411, the second end of which is free, and the translation screw can be arranged along the second direction D. The middle part of the translation screw is connected to the second support portion 412, and the translation screw only has the degree of freedom to rotate around its own axis relative to the second support portion 412. Since the first end of the translation screw is threadedly connected to the first support portion 411, the translation screw can be moved along its own axis by rotating the second end of the translation screw, driving the second support portion 412 to move together, making the position adjustment between the first support portion 411 and the second support portion 412 more convenient and quick.

[0047] In one embodiment, see Figure 1 or Figure 2 The main frame 1 includes a fixed support part 11, a movable support part 12 and a correction unit 13. The movable support part 12 is slidably connected to the fixed support part 11 along a third direction E. The third direction E is a direction parallel to the axis of the support roller 2. The correction unit 13 is arranged between the fixed support part 11 and the movable support part 12, and the correction unit 13 is used to push the movable support part 12 to slide along the third direction E. Specifically, the fixed support part 11 and the movable support part 12 both refer to support parts with a certain volume. The fixed support part 11 and the movable support part 12 can be slidably connected through a sliding unit 14 or directly slidably connected. The correction unit 13 refers to a component used to drive the object to move. The correction unit 13 can be a cylinder, an electric push rod or a hydraulic cylinder, etc. The correction unit 13 can also be a screw structure, wherein the screw structure can be driven manually or by a motor. By connecting the movable support part 12 to the fixed support part 11 by sliding along the third direction E, and the support roller 2 and the clamping mechanism 4 are both arranged on the movable support part 12, the movable support part 12 can be pushed to slide along the third direction E by the correction unit 13 when the pole ear is bent, so that the position of the support roller 2 and the clamping mechanism 4 can be more matched with the pole piece, making the entire bending device more convenient to use.

[0048] In an alternative embodiment, see Figure 1 or Figure 2 The sliding unit 14 includes a slide rail 142 arranged on the fixed support part 11 and a slider 141 arranged on the movable support part 12. The slider 141 is slidably connected to the slide rail 142 and can slide along the length direction of the slide rail 142. The slide rail 142 is arranged along the axial direction of the support roller shaft 2, that is, along the third direction E. The slide rail 142 cooperates with the slider 141 to make the sliding connection between the fixed support part 11 and the movable support part 12 more convenient and smooth.

[0049] In one embodiment, see Figure 1 or Figure 2The deviation correction unit 13 includes a pushing screw 131 and an elastic member 132. The pushing screw 131 is threadedly connected to the fixed support portion 11 and has the freedom to rotate around its own axis relative to the fixed support portion 11. The end of the pushing screw 131 abuts against the movable support portion 12. The elastic member 132 is arranged between the fixed support portion 11 and the movable support portion 12, and is located on the side of the movable support portion 12 away from the pushing screw 131. The elastic member 132 is used to apply a force to the movable support portion 12 toward the pushing screw 131. Specifically, the pushing screw 131 refers to a rod-shaped component with a certain length, and the pushing screw 131 is threadedly connected to the fixed support portion 11. The elastic member 132 refers to an elastic component with a certain length, and the elastic member 132 can be a spring, a rubber component, a nitrogen spring, etc. When adjusting the position of the movable support part 12, the pushing screw 131 can be rotated to move the pushing screw 131 away from or towards the movable support part 12, and the movable support part 12 will be pushed to move during the movement of the pushing screw 131. In addition, the elastic member 132 is used to apply a force to the movable support part 12 toward the pushing screw 131, so that the movable support part 12 and the pushing screw 131 can always maintain contact, making the position adjustment of the movable support part 12 more convenient, and also making the position adjustment of the support roller 2 more convenient.

[0050] In one embodiment, see Figure 1 or Figure 2 The movable support part 12 is provided with a sliding guide 15, which is arranged along the axial direction of the support roller shaft 2, and the fixed support part 11 is also provided with a guide structure for cooperating with the sliding guide 15. The movable support part 12 is slidably arranged on the fixed support part 11 along a preset path through the sliding guide 15 and the guide structure. Specifically, the sliding guide 15 refers to a component that can guide the movement of an object, and the sliding guide 15 can be a guide rod, a guide block or a guide rail. The setting of the sliding guide 15 can make the sliding of the movable support part 12 more stable, and the position adjustment of the support roller shaft 2 more accurate.

[0051] See also Figure 1 or Figure 2 The sliding guide member 15 includes a guide rod, and the guide structure includes a guide hole provided in the fixed support portion 11. One end of the guide rod is connected to the movable support portion 12, and the other end of the guide rod is slidably inserted into the guide hole, and the guide rod is arranged along the axial direction of the support roller shaft 2. Through the sliding cooperation between the guide rod and the guide hole, the sliding of the movable support portion 12 can be made more stable and convenient.

[0052] Based on the above feature guide rod, please refer to Figure 1 or Figure 2The elastic member 132 includes a spring, which is sleeved on the outside of the guide rod, and one end of the spring abuts against the fixed support part 11, and the other end of the spring abuts against the movable support part 12. By sleeved the spring on the outside of the guide rod, the installation of the spring can be made more stable, and the movement of the entire movable support part 12 can be made more stable.

[0053] See also Figure 4 In the second aspect, a battery cell winding device is provided, comprising any one of the above-mentioned tab bending devices 100. Specifically, the battery cell winding device may further include a negative electrode sheet supply group 200, a positive electrode sheet supply group 300, a first diaphragm supply group 400, a second diaphragm supply group 500 and a winding mechanism 600, wherein the negative electrode sheet supply group 200 provides the winding mechanism 600 with a negative electrode sheet, the positive electrode sheet supply group 300 provides the winding mechanism 600 with a positive electrode sheet, and the first diaphragm supply group 400 and the second diaphragm supply group 500 provide the diaphragm to the winding mechanism 600, and finally the negative electrode sheet, the positive electrode sheet and the diaphragm are wound into a battery cell structure through the winding mechanism 600. The tab bending device 100 may be provided with two groups, and the two groups of tab bending devices 100 are respectively provided on the moving path of the positive electrode sheet and the moving path of the negative electrode sheet, so that the tabs on the negative electrode sheet and the positive electrode sheet can be pre-bent before the negative electrode sheet and the positive electrode sheet are wound into a battery cell. This avoids the difficulty of bending caused by the misalignment of the tabs on the negative electrode sheet and the positive electrode sheet after the negative electrode sheet and the positive electrode sheet are wound into a battery cell structure, making the bending of the tabs more convenient and improving the production efficiency of the battery cell.

[0054] In an alternative embodiment, see Figure 4 The positive electrode sheet feeding group 300 can be arranged on the left side of the winding mechanism 600, the negative electrode sheet feeding group 200 can be arranged on the right side of the winding mechanism 600, and the first diaphragm feeding group 400 is arranged above the winding mechanism 600. The direction of the pole ear on the positive electrode sheet is opposite to the direction of the pole ear on the negative electrode sheet, so that the two pole ear bending devices 100 can work independently without causing interference between the work of the pole ear bending device 100 and the work of the other pole ear bending device 100.

[0055] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A tab bending device, characterized in that: include: Main frame; A support roller shaft is rotatably arranged on the main frame, used to abut against the pole piece and can rotate with the movement of the pole piece, and a bending working part is arranged on the support roller shaft, and the bending working part is used to abut against the pole ear on the pole piece when the pole piece passes through the support roller shaft to bend the pole ear; The clamping mechanism is arranged on the main frame and is used for clamping the main body of the pole piece against the surface of the supporting roller shaft and making the pole ear on the pole piece abut against the bending working part.

2. The tab bending device according to claim 1, characterized in that: The bending working portion includes an annular component and a working inclined surface. The annular component is protruding from one end of the support roller shaft, and the annular component is arranged around the support roller shaft. The working inclined surface is arranged on the side of the annular component facing the other end of the support roller shaft. The working inclined surface is arranged at an angle to the surface of the support roller shaft, and is used to abut against the pole ear passing through the working inclined surface to bend the pole ear.

3. The tab bending device according to claim 2, characterized in that: The working inclined surface comprises a conical surface, and the angle between the conical surface and the surface of the supporting roller shaft is 90° to 150°.

4. The tab bending device according to claim 1, characterized in that: The clamping mechanism includes an adjusting bracket and a clamping roller, the adjusting bracket is arranged on the main frame, the clamping roller is rotatably arranged on the adjusting bracket, and the axis of the clamping roller is parallel to the axis of the supporting roller, and the clamping roller is used to clamp the pole piece when the pole piece passes through the supporting roller.

5. The tab bending device according to claim 4, characterized in that: The adjustment bracket is slidably connected to the main frame along a first direction, and the first direction is a direction perpendicular to the axis of the supporting roller shaft. A lifting unit is arranged between the adjustment bracket and the main frame, and the lifting unit is used to drive the adjustment bracket to move perpendicular to the first direction.

6. The tab bending device according to claim 5, characterized in that: The adjustment bracket includes a first support part, a second support part and a translation unit, the first support part is slidably connected to the main frame along a first direction, and the second support part is slidably connected to the first support part along a second direction, the second direction is perpendicular to the first direction, the translation unit is arranged between the first support part and the second support part, the translation unit is used to drive the first support part to move along the second direction, and the clamping roller is rotatably connected to the second support part.

7. The tab bending device according to claim 1, characterized in that: The main frame includes a fixed support part, a movable support part and a correction unit, the movable support part is slidably connected to the fixed support part along a third direction, and the third direction is a direction parallel to the axis of the support roller shaft, the correction unit is arranged between the fixed support part and the movable support part, and the correction unit is used to push the movable support part to slide along the third direction.

8. The tab bending device according to claim 7, characterized in that: The correction unit includes a pushing screw and an elastic member. The pushing screw is threadedly connected to the fixed support portion and has the freedom to rotate around its own axis relative to the fixed support portion. The end of the pushing screw abuts against the movable support portion. The elastic member is arranged between the fixed support portion and the movable support portion and is located on the side of the movable support portion away from the pushing screw. The elastic member is used to apply a force to the movable support portion toward the pushing screw.

9. The tab bending device according to claim 8, characterized in that: The movable support portion is provided with a sliding guide member arranged along the axial direction of the support roller shaft, and the fixed support portion is also provided with a guide structure for slidingly cooperating with the sliding guide member. The movable support portion is slidably arranged on the fixed support portion along a preset path through the sliding guide member and the guide structure.

10. A battery cell winding device, characterized in that: It comprises a tab bending device as described in any one of claims 1 to 9.

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