Secondary rolling device for battery pole piece

Abstract

The utility model discloses a secondary rolling device for a battery pole piece. The secondary rolling device comprises a mounting rack, the first compression roller is rotationally assembled on the mounting frame; the second compression roller is rotationally assembled on the mounting frame, and the second compression roller is tangent to the first compression roller; the third pressing roller is rotationally assembled on the mounting frame, and the third pressing roller is tangent to the first pressing roller; wherein the second compression roller and the third compression roller are arranged at an interval, and the connecting lines of the orthographic projections of the axes of the first compression roller, the second compression roller and the third compression roller on the mounting rack form a right triangle or an obtuse triangle. According to the secondary rolling device, the structure of the secondary rolling device can be simplified, the first pressing roller, the second pressing roller and the third pressing roller are adopted to achieve the effect that two-time rolling is completed through the three pressing rollers, the space occupied by the secondary rolling device is reduced, the rolling distances on the two sides are short, compared with four pressing rollers, the time consumed by secondary rolling can be shortened, and the production efficiency is improved. Therefore, the processing efficiency of the pole piece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field related to battery processing equipment, in particular to a secondary rolling device for battery pole pieces. Background Art

[0002] In the production process of lithium batteries, pole sheet rolling is a crucial process. The consistency of pole sheet rolling thickness directly determines the electrical performance of the battery. Especially under the current trend of pursuing large-capacity batteries, the compaction of pole sheets continues to increase, and the requirements for rolling technology are becoming more and more stringent. At present, the pole sheet rolling methods commonly used in the industry mainly include cold pressing, hot pressing and secondary rolling.

[0003] Although these methods can meet production needs to a certain extent, they each have obvious shortcomings. Taking a single roll press as an example, although the pole piece can be initially compacted, the internal stress of the pole piece after rolling is relatively large, resulting in high brittleness of the pole piece, which is prone to breakage, wavy edges and other problems. In addition, the inconsistent extension of each edge also affects the overall performance of the battery.

[0004] In order to solve these problems, the industry has proposed a technical solution of secondary rolling (patent number: 201120485298.1). This method uses two pairs of main rollers to roll the pole pieces for a second time, effectively alleviating the high stress and fracture inside the pole roll. However, the secondary rolling technology is not perfect. Its equipment structure is relatively complex, which not only increases maintenance costs, but also occupies a large workshop area, which poses a considerable challenge to controlling production costs and improving production efficiency.

[0005] Therefore, how to reduce equipment complexity, reduce maintenance costs and optimize workshop layout while ensuring the consistency of electrode rolling thickness has become an urgent problem to be solved in the current lithium battery production field. Utility Model Content

[0006] In order to overcome at least one of the defects of the prior art, the utility model provides a secondary rolling device for battery pole pieces, which can solve the problems of equipment complexity and space occupation.

[0007] The technical solution adopted by the utility model to solve the problem is:

[0008] A secondary rolling device for a battery pole piece comprises: a mounting frame; a first rolling roller, which is rotatably mounted on the mounting frame; a second rolling roller, which is rotatably mounted on the mounting frame, and is tangent to the first rolling roller; a third rolling roller, which is rotatably mounted on the mounting frame, and is tangent to the first rolling roller; wherein the second rolling roller and the third rolling roller are arranged at intervals, and the line connecting the axes of the first rolling roller, the second rolling roller and the third rolling roller on the orthographic projection of the mounting frame is a right triangle or an obtuse triangle.

[0009] By adopting the above scheme, the structure of the secondary rolling device can be simplified, and the first pressing roller, the second pressing roller and the third pressing roller are used to achieve the effect of completing two rolling presses with three pressing rollers, thereby reducing the space occupied by the secondary rolling device, and the rolling distance on both sides is closer. Compared with the use of four pressing rollers, the time consumed by the secondary rolling press can be reduced, thereby improving the efficiency of the electrode processing.

[0010] Furthermore, the second pressing roller is tangent to the first pressing roller to form a first rolling surface for rolling the pole piece, and the mounting frame is provided with a pole piece entrance roller tangent to the first rolling surface in the extension direction of the first rolling surface, and the pole piece entrance roller rotates following the movement of the pole piece.

[0011] By adopting the above solution, the pole piece can be smoothly transferred from the roller to the first roller pressing surface without getting stuck or scratched, thereby improving production efficiency, reducing the risk of damage to the pole piece during transmission, and helping to maintain the stable operation of the production line.

[0012] Furthermore, the third pressing roller is tangent to the first pressing roller to form a second rolling surface for rolling the pole piece, and the mounting frame is provided with a pole piece outlet roller tangent to the second rolling surface in the extension direction of the second rolling surface, and the pole piece outlet roller rotates following the movement of the pole piece.

[0013] By adopting the above solution, no matter how the moving speed of the pole piece changes, the pole piece exit roller can rotate synchronously with it, ensuring the stability and continuity of the pole piece when it leaves the rolling device. This design helps to reduce the damage of the pole piece at the exit and maintain the smooth operation of the production line.

[0014] Furthermore, an angle between a line connecting the axes of the first pressing roller and the second pressing roller and a line connecting the axes of the first pressing roller and the third pressing roller is in a range of 90°-110°.

[0015] By adopting the above scheme, within the angle range of 90°-110°, interference between the second pressing roller and the third pressing roller can be effectively avoided, and the secondary rolling of the pole piece can be facilitated, so that the pole piece between the first rolling surface and the second rolling surface can be wound along the surface of the first pressing roller, reducing the stress concentration on the pole piece during the rolling process, thereby reducing the risk of pole piece breakage, twisting or deformation.

[0016] Furthermore, the first pressure roller, the second pressure roller and the third pressure roller are connected to a driving motor for controlling their own rotation, the first pressure roller and the second pressure roller rotate in opposite directions, and the second pressure roller and the third pressure roller rotate in the same direction.

[0017] By adopting the above scheme, the rotation of each pressing roller can be independently controlled, so that the rolling parameters can be flexibly adjusted according to production needs. Combined with the setting of the rotation direction between different pressing rollers, this battery electrode secondary rolling device can realize assembly line rolling of the electrode, thereby improving the efficiency of secondary rolling.

[0018] Furthermore, it also includes an unwinding mechanism, which is used to provide the pole piece to be rolled to the first rolling surface.

[0019] By adopting the above solution, it can be ensured that the pole piece is released from the reel of the unwinding mechanism at a stable speed and tension and is accurately fed into the first rolling surface.

[0020] Furthermore, it also includes a winding mechanism, which is used to receive and wind the pole piece rolled out from the second rolling surface.

[0021] By adopting the above solution, it is ensured that the pole pieces after rolling can be collected in an orderly manner, which is convenient for subsequent processing and use.

[0022] Furthermore, a first stretching mechanism for stretching the pole piece is provided between the unwinding mechanism and the first pressing roller.

[0023] By adopting the above solution, the first stretching mechanism stretches the pole piece released from the unwinding mechanism to ensure that the pole piece has a certain tension and straightness before entering the first rolling surface.

[0024] Furthermore, a second stretching mechanism for stretching the pole piece is provided between the winding mechanism and the first pressing roller.

[0025] By adopting the above solution, the second stretching mechanism can stretch the pole piece again after the second rolling to eliminate possible internal stress and slight deformation.

[0026] Furthermore, a thickness measuring mechanism for measuring the thickness of the pole piece is provided between the winding mechanism and the first pressing roller.

[0027] By adopting the above solution, the thickness of the pole piece after rolling can be monitored in real time to ensure that the thickness of the pole piece meets the preset standard.

[0028] In summary, the battery pole piece secondary rolling device provided by the utility model has the following technical effects:

[0029] 1. The device uses three pressing rollers, namely the first pressing roller, the second pressing roller and the third pressing roller, to achieve a double pressing effect. Compared with the traditional design of four pressing rollers, the structure is simpler. This simplification not only reduces the complexity and manufacturing cost of the device, but also significantly saves the occupied space, making the entire device more compact and convenient for layout and installation on the production line.

[0030] 2. Since the second and third rollers are set at intervals, the distance between the two roller pressings is closer, which reduces the transmission time and distance of the pole piece between the two roller pressings. This helps to speed up the production line, shorten the production cycle, and thus improve production efficiency;

[0031] 3. The first pressing roller, the second pressing roller and the third pressing roller form a first pressing surface and a second pressing surface, so that the pole piece can be subjected to uniform and effective pressure when passing through, thereby improving the density and consistency of the pole piece; this helps to improve the performance and stability of the battery;

[0032] 4. Due to the use of fewer pressure rollers, the energy consumption required during the operation of the device is relatively low; at the same time, the simplified structure also reduces the workload of maintenance and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of a secondary rolling device for a battery pole piece according to an embodiment of the utility model;

[0034] Figure 2 This is a schematic structural diagram of another battery pole piece secondary rolling device according to an embodiment of the utility model;

[0035] Figure 3 This is a schematic structural diagram of another battery pole piece secondary rolling device according to an embodiment of the utility model;

[0036] Figure 4 It is a schematic structural diagram of another battery pole piece secondary rolling device according to an embodiment of the utility model.

[0037] Among them, the meanings of the figure marks are as follows: 1. mounting frame; 2. first pressure roller; 3. second pressure roller; 4. third pressure roller; 5. pole piece; 6. pole piece inlet roller; 7. pole piece outlet roller; 8. first roller pressure surface; 9. second roller pressure surface; 10. unwinding mechanism; 11. winding mechanism; 12. first stretching mechanism; 13. second stretching mechanism; 14. thickness measuring mechanism. DETAILED DESCRIPTION

[0038] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] In order to facilitate the understanding of the embodiments of the present utility model, the following will be further explained by taking specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present utility model.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0042] Embodiment 1 of the present utility model is referred to Figure 1As shown, a secondary rolling device for a battery electrode sheet is disclosed, comprising a mounting frame 1, a first pressing roller 2, a second pressing roller 3 and a third pressing roller 4, wherein the first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 are all rotatably assembled on the mounting frame 1, the second pressing roller 3 is tangent to the first pressing roller 2 to form a first rolling surface 8 for rolling the electrode sheet 5; the third pressing roller 4 is tangent to the first pressing roller 2 to form a second rolling surface 9 for rolling the electrode sheet 5; the second pressing roller 3 and the third pressing roller 4 are arranged at intervals, because when the line connecting the axes of the first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 on the positive projection of the mounting frame 1 is an acute triangle, the electrode sheet needs to be around more than 50% of the surface of the first pressing roller 1, thereby increasing the distance of the two rollings and improving the longitudinal space occupied by the mounting frame. Therefore, in the present embodiment 1, the connecting line of the axes of the first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 on the positive projection of the mounting frame 1 is a right triangle or an obtuse triangle, and thus the structure of the secondary rolling device can be simplified. The first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 are used to achieve the effect of completing two rollings with three pressing rollers, thereby reducing the space occupied by the secondary rolling device, and the rolling on both sides makes the interval between the two rollings of the same pole piece closer. Compared with the use of four pressing rollers, the time consumed by the secondary rolling can be reduced, thereby improving the efficiency of processing the pole piece 5.

[0043] It should be noted that the angle between the axis line of the first pressing roller and the second pressing roller and the axis line of the first pressing roller and the third pressing roller is in the range of 90°-110°. Similarly, the angle between the first rolling surface 8 and the second rolling surface 9, which are equal to the angle, is also in the range of 90°-110°. The above angle range is preferably 90°, 95°, 100°, 105° and 110°. The first rolling surface 8 and the second rolling surface 9 are in the angle range of 90°-110°, which can effectively avoid interference between the second pressing roller 3 and the third pressing roller 4, and facilitate the secondary rolling of the pole piece 5, so that the pole piece 5 between the first rolling surface 8 and the second rolling surface 9 can be wound along the surface of the first pressing roller 2, reducing the stress concentration of the pole piece 5 during the rolling process, thereby reducing the risk of fracture, distortion or deformation of the pole piece 5. In this embodiment 1, the sizes of the first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 are the same, and in other embodiments, no specific limitation is made.

[0044] The working principle of this embodiment 1 is as follows:

[0045] The pole piece 5 material to be rolled is fed from the first rolling surface 8, and the first rolling roller 2 and the second rolling roller 3 perform the first rolling operation on the pole piece 5 material. Subsequently, the pole piece 5 material is fed from the second rolling surface 9 again following the rotation of the first rolling roller 2. At this time, the first rolling roller 2 and the third rolling roller 4 perform the second rolling operation on the pole piece 5 material, thereby completing the processing of the pole piece 5 material.

[0046] It should be noted that, in the present embodiment 1, in order to enable the first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 to rotate normally and realize the rolling work, the first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 are connected with a driving motor for controlling their own rotation, the first pressing roller 2 and the second pressing roller 3 have opposite rotation directions, and the second pressing roller 3 and the third pressing roller 4 have the same rotation direction, so that the rotation of each pressing roller can be independently controlled, so that the rolling parameters can be flexibly adjusted according to production requirements, combined with the setting of the rotation direction between different pressing rollers, this secondary rolling device for battery electrode 5 can realize assembly line rolling of the electrode 5, thereby improving the efficiency of secondary rolling.

[0047] See also Figure 2 As shown, in some embodiments, in order to improve the smoothness of the feeding of the pole piece 5 material from the first rolling surface 8 to the feeding machine from the second rolling surface 9, optionally, a pole piece inlet roller 6 and a pole piece outlet roller 7 are respectively arranged on the mounting frame 1, the extension direction of the first rolling surface 8 is tangent to the pole piece inlet roller 6, the pole piece inlet roller 6 rotates following the movement of the pole piece 5, the extension direction of the second rolling surface 9 is tangent to the pole piece outlet roller 7, the pole piece outlet roller 7 rotates following the movement of the pole piece 5, so that the pole piece 5 can smoothly transition from the roller to the first rolling surface 8 without jamming or scratching, thereby improving production efficiency, reducing the risk of damage to the pole piece 5 during the transmission process, and helping to maintain the stable operation of the production line, and no matter how the moving speed of the pole piece 5 changes, the pole piece outlet roller 7 can rotate synchronously with it to ensure the stability and continuity of the pole piece 5 when it leaves the rolling device. This design helps to reduce the damage of the pole piece 5 at the outlet and maintain the smooth operation of the production line.

[0048] In some embodiments, see Figure 3 As shown, the driving motor can be replaced with an unwinding mechanism 10 and a winding mechanism 11, which can realize the winding operation of the electrode material. Therefore, it is unnecessary to directly set a driving motor on the first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 to realize the rotation effect of the three pressing rollers.

[0049] The working principle of the roller pressing device after adding the unwinding mechanism 10 and the rewinding mechanism 11 is as follows:

[0050] The unwinding mechanism 10 ensures that the electrode sheet 5 is released from the reel at a stable speed and tension, and is accurately fed into the first rolling surface 8. Before being fed into the first rolling surface 8, it is guided by the electrode sheet entrance roller 6, and the first pressing roller 2 and the second pressing roller 3 are used to realize the first rolling operation of the electrode sheet 5 material. Subsequently, the electrode sheet 5 material follows the rotation of the first pressing roller 2 and is fed into the second rolling surface 9 again. At this time, the first pressing roller 2 and the third pressing roller 4 realize the second rolling operation of the electrode sheet 5 material. The electrode material after the second rolling is guided by the electrode sheet 5 outlet support, and then is wound into a roll by the winding mechanism 11, thereby completing the secondary rolling effect of the electrode sheet 5 material.

[0051] See also Figure 4 As shown, in order to ensure the tightness and neatness of winding and ensure that the pole piece 5 maintains appropriate tension during the winding process, in some embodiments, a first stretching mechanism 12 for stretching the pole piece 5 may be provided between the unwinding mechanism 10 and the first pressure roller 2, and a second stretching mechanism 13 for stretching the pole piece 5 may be provided between the winding mechanism 11 and the first pressure roller 2. The first stretching mechanism 12 stretches the pole piece 5 released from the unwinding mechanism 10 to ensure that the pole piece 5 has a certain tension and straightness before entering the first rolling surface 8. The second stretching mechanism 13 can stretch the pole piece 5 after the second rolling again to eliminate possible internal stress and slight deformation.

[0052] Optional, see Figure 4 As shown, the winding mechanism 11 may also be equipped with an automatic switching device, which can automatically switch to the next reel when a roll of pole piece 5 is fully wound to ensure the continuity of production.

[0053] Optional, see Figure 4 As shown, a thickness measuring mechanism 14 for measuring the thickness of the pole piece 5 is provided between the winding mechanism 11 and the first pressing roller 2, so that the thickness of the pole piece 5 after rolling can be monitored in real time to ensure that the thickness of the pole piece 5 meets the preset standard.

[0054] In summary, the battery pole piece secondary rolling device provided by the utility model has the following technical effects:

[0055] 1. The device uses three pressing rollers, namely, the first pressing roller 2, the second pressing roller 3 and the third pressing roller 4, to achieve a double pressing effect. Compared with the traditional design of four pressing rollers, the structure is simpler. This simplification not only reduces the complexity and manufacturing cost of the device, but also significantly saves the occupied space, making the entire device more compact and convenient for layout and installation on the production line.

[0056] 2. Since the second pressing roller 3 and the third pressing roller 4 are arranged at intervals, the distance between the two rolling presses is shorter, which reduces the transmission time and distance of the pole piece 5 between the two rolling presses. This helps to speed up the operation of the production line, shorten the production cycle, and thus improve production efficiency;

[0057] 3. The first pressing roller 2, the second pressing roller 3 and the third pressing roller 4 form a first pressing surface 8 and a second pressing surface 9, so that the pole piece 5 can be subjected to uniform and effective pressure when passing through, thereby improving the density and consistency of the pole piece 5; this helps to improve the performance and stability of the battery;

[0058] 4. Due to the use of fewer pressure rollers, the energy consumption required during the operation of the device is relatively low; at the same time, the simplified structure also reduces the workload of maintenance and reduces maintenance costs.

[0059] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A secondary rolling device for battery pole pieces, characterized in that: include: Mounting frame (1); A first pressing roller (2), the first pressing roller (2) being rotatably mounted on the mounting frame (1); A second pressing roller (3), the second pressing roller (3) is rotatably mounted on the mounting frame (1), and the second pressing roller (3) is tangent to the first pressing roller (2); a third pressing roller (4), the third pressing roller (4) being rotatably mounted on the mounting frame (1), the third pressing roller (4) being tangent to the first pressing roller (2); The second pressing roller (3) and the third pressing roller (4) are arranged at intervals, and the line connecting the axes of the first pressing roller (2), the second pressing roller (3) and the third pressing roller (4) on the orthographic projection of the mounting frame (1) is a right triangle or an obtuse triangle.

2. A battery pole piece secondary rolling device according to claim 1, characterized in that: The second pressing roller (3) is tangent to the first pressing roller (2) to form a first rolling surface (8) for rolling the pole piece (5); the mounting frame (1) is provided with a pole piece inlet support roller (6) tangent to the first rolling surface (8) in the extension direction of the first rolling surface (8); the pole piece inlet support roller (6) rotates following the movement of the pole piece (5).

3. A battery pole piece secondary rolling device according to claim 1, characterized in that: The third pressing roller (4) is tangent to the first pressing roller (2) to form a second rolling surface (9) for rolling the pole piece (5); the mounting frame (1) is provided with a pole piece outlet roller (7) tangent to the second rolling surface (9) in the extension direction of the second rolling surface (9); the pole piece outlet roller (7) rotates following the movement of the pole piece (5).

4. A battery pole piece secondary rolling device according to claim 1, characterized in that: The angle between the axis line between the first pressing roller (2) and the second pressing roller (3) and the axis line between the first pressing roller (2) and the third pressing roller (4) is in the range of 90°-110°.

5. The battery pole piece secondary rolling device according to claim 1, characterized in that: The first pressing roller (2), the second pressing roller (3) and the third pressing roller (4) are connected to a driving motor for controlling their own rotation; the first pressing roller (2) and the second pressing roller (3) rotate in opposite directions, and the second pressing roller (3) and the third pressing roller (4) rotate in the same direction.

6. A battery pole piece secondary rolling device according to any one of claims 1 to 5, characterized in that: It also comprises an unwinding mechanism (10), wherein the unwinding mechanism (10) is used to provide the pole piece (5) to be rolled between the first pressing roller (2) and the second pressing roller (3).

7. A battery pole piece secondary rolling device according to claim 6, characterized in that: It also comprises a winding mechanism (11), wherein the winding mechanism (11) is used to receive and wind up the pole piece (5) rolled out between the first pressing roller (2) and the third pressing roller (4).

8. The battery pole piece secondary rolling device according to claim 6, characterized in that: A first stretching mechanism (12) for stretching the pole piece (5) is provided between the unwinding mechanism (10) and the first pressing roller (2).

9. A battery pole piece secondary rolling device according to claim 7, characterized in that: A second stretching mechanism (13) for stretching the pole piece (5) is provided between the winding mechanism (11) and the first pressing roller (2).

10. A battery pole piece secondary rolling device according to claim 7, characterized in that: A thickness measuring mechanism (14) for measuring the thickness of the pole piece (5) is provided between the winding mechanism (11) and the first pressing roller (2).

Images