Flattening device

Abstract

The utility model relates to the technical field of batteries, in particular to a flattening device. The utility model provides a flattening device. The flattening device can solve the problem that a pole roll is prone to collapse due to the fact that an uncoated area is thinner than a coated area. When the pole piece winding device is applied, in the pole piece winding process, the flattening roller can apply pressure to the surface of the pole piece to be wound, the flattening roller unceasingly flattens wrinkles on the surface of the pole piece to be wound, and pole rolls are prevented from collapsing in the winding process. In the process that the winding roller continuously winds the to-be-wound pole piece, the diameter of the pole roll is continuously increased, the distance between the flattening roller and the pole roll is adjusted through the distance adjusting mechanism, interference between the flattening roller and the pole roll due to the too short distance is avoided, and the situation that the flattening effect cannot be achieved due to the fact that the pressing force of the flattening roller to the to-be-wound pole piece is too small due to the too long distance is also avoided.

Description

Technical Field

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

[0002] At present, lithium-ion power batteries mainly adopt the strip coating method. Since the pole piece is coated continuously, the pole piece surface density is consistent, and there is no thick edge effect at the head and tail, it has been widely used in the field of power batteries. In the strip coating process, there will be uncoated areas between adjacent coated areas. Since the uncoated area is thinner than the coated area, as the radius of the rolled pole roll increases, the uncoated area collapses toward the core of the roll under the action of tension, and then pulls the two sides of the pole piece inward, thereby generating wrinkles, which will affect the product quality. In summary, in the current pole piece winding process, how to solve the problem of easy collapse of the pole roll due to the thinner thickness of the uncoated area than the coated area is a technical problem that needs to be solved in this field. Utility Model Content

[0003] In view of this, the present application provides a flattening device that can solve the problem that the pole roll is prone to collapse due to the uncoated area being thinner than the coated area.

[0004] In the first aspect, the present application provides a flattening device, which is arranged on the upstream side of the winding roller along the conveying direction of the pole piece, and the flattening device is used to flatten the pole piece to be wound up, and the winding roller is used to wind up the pole piece to be wound up and form a pole roll; the flattening device includes: a flattening roller, which at least partially covers the pole piece surface of the pole piece to be wound up to flatten the wrinkles on the surface of the pole piece to be wound up; and a distance adjustment mechanism, which is connected to the flattening roller, and the distance adjustment mechanism is constructed to adjust the distance between the flattening roller and the pole roll to keep it constant.

[0005] In combination with the first aspect, in a possible implementation, the flattening device also includes: a fixed support frame, connected to the adjustment end of the distance adjustment mechanism; a flattening roller mounting frame, the flattening roller is rotatably connected to the flattening roller mounting frame, and the flattening roller mounting frame is rotatably connected to the fixed support frame via a hinge seat; and an angle adjustment assembly, respectively connected to the fixed support frame and the flattening roller mounting frame, the angle adjustment assembly is constructed to: adjust the angle between the flattening roller mounting frame and the surface of the pole piece to be rolled up, and then adjust the mutual angle between the first roller axis of the flattening roller and the pole piece surface of the pole piece to be rolled up.

[0006] In combination with the first aspect, in a possible implementation, the angle adjustment assembly includes: a first adjustment rod and a second adjustment rod, the first adjustment rod is detachably connected to the fixed support frame and the flattening roller mounting frame respectively, the second adjustment rod is detachably connected to the fixed support frame and the flattening roller mounting frame respectively, the first adjustment rod and the second adjustment rod are respectively arranged on opposite sides of the articulated seat, and the angle adjustment assembly is constructed to: adjust the length of the first adjustment rod and the length of the second adjustment rod between the fixed support frame and the flattening roller mounting frame.

[0007] In combination with the first aspect, in a possible implementation, the flattening device further includes: a flattening roller drive motor, which is disposed on the flattening roller mounting frame, and an output shaft of the flattening roller drive motor is connected to the flattening roller to drive the flattening roller to rotate.

[0008] In combination with the first aspect, in a possible implementation, the flattening device includes a first flattening roller and a second flattening roller, and the first flattening roller and the second flattening roller are symmetrically arranged on both sides along the pole piece conveying direction.

[0009] In combination with the first aspect, in a possible implementation, the pole piece to be rolled up includes a first uncoated area, a second uncoated area, a third uncoated area and a fourth uncoated area uniformly distributed in the width direction; the first outer edge of the first flattening roller is pressed at a first position, the first position is located within the edge of the pole piece of the pole piece to be rolled up, the first inner edge of the first flattening roller is pressed at a second position, the second position is at a distance of -50 mm to 100 mm from the edge of the second uncoated area toward the third uncoated area, and the first outer edge is the distance between the first flattening roller and the second flattening roller. Edge, the first inner edge is the edge of the first flattening roller close to the second flattening roller; the second outer edge of the second flattening roller is pressed at a third position, and the third position is located inside the edge of the pole piece of the pole piece to be rolled up, the second inner edge of the second flattening roller is pressed at a fourth position, and the fourth position is at a distance of -50mm to 100mm from the edge of the third uncoated area toward the second uncoated area, the second outer edge is the edge of the second flattening roller away from the first flattening roller, and the second inner edge is the edge of the second flattening roller close to the first flattening roller.

[0010] In combination with the first aspect, in a possible implementation manner, the angle between the roller axis of the flattening roller and the pole piece surface of the pole piece to be rolled up is any value between 45° and 85°.

[0011] In combination with the first aspect, in a possible implementation, it also includes: a fixed frame; the distance adjustment mechanism includes: a swing arm, which is hingedly connected to the fixed frame, and the flattening roller is arranged on the swing arm; and a swing drive assembly, which is connected to the swing arm to drive the swing arm to rotate around the hinge axis of the swing arm on the fixed frame, so as to drive the flattening roller to approach or move away from the pole roll.

[0012] In combination with the first aspect, in a possible implementation, the swing drive assembly also includes: a servo motor, which is arranged on the fixed frame; a driving wheel, which is connected to the driving shaft of the servo motor; a driven wheel, which is rotatably connected to the fixed frame, one end of the swing arm is connected to the axle of the driven wheel, and a flattening roller is arranged on the other end of the swing arm; and a transmission belt, which is respectively connected to the driving wheel and the driven wheel.

[0013] In combination with the first aspect, in a possible implementation, it also includes: a passing roller, which is arranged on the side of the flattening roller away from the winding roller, and the pole piece to be wound is pressed onto the passing roller and the flattening roller in turn and then rolled into the winding roller; the rotation angle of the servo motor is Δθ=2(arccos(r1 / L)-arocos(r2 / L)), r1 is the radius of the winding roller in an empty roll state, r2 is the current radius of the pole roll, and L is the distance value between the passing roller axis of the passing roller and the winding roller axis of the winding roller.

[0014] When the present application is used, during the process of winding up the pole piece, the flattening roller can apply pressure to the surface of the pole piece to be wound up, and the flattening roller continuously flattens the wrinkles on the surface of the pole piece to be wound up, so as to avoid the pole roll from collapsing during the winding process. During the process of the winding roller continuously winding up the pole piece to be wound up, the diameter of the pole roll continuously increases, and the distance adjustment mechanism adjusts the distance between the flattening roller and the pole roll to avoid interference between the flattening roller and the pole roll due to the distance being too close, and also to avoid the flattening effect being ineffective due to the flattening roller pressing too little on the pole piece to be wound up due to the distance being too far. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic structural diagram of a flattening device provided in one embodiment of the present application.

[0016] Figure 2 Shown is a partial structural schematic diagram of a flattening device provided in one embodiment of the present application.

[0017] Figure 3 Shown is a partial structural schematic diagram of a flattening device provided in another embodiment of the present application.

[0018] Figure 4 Shown is a partial structural schematic diagram of a flattening device provided in another embodiment of the present application.

[0019] Figure 5 Shown is a partial structural schematic diagram of a flattening device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] An exemplary flattening device is as follows:

[0022] Figure 1 Shown is a schematic structural diagram of a flattening device provided in one embodiment of the present application. Figure 2 Shown is a partial structural schematic diagram of a flattening device provided in one embodiment of the present application. Figure 3 Shown is a partial structural schematic diagram of a flattening device provided in another embodiment of the present application. Figure 4 FIG. 1 is a partial structural schematic diagram of a flattening device provided by another embodiment of the present application. The present application provides a flattening device, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the flattening device is arranged on the upstream side of the winding roller 1 along the conveying direction of the pole piece, and is used to flatten the pole piece 2 to be wound. The winding roller 1 is used to wind up the pole piece 2 to be wound and form a pole roll 3. The winding roller 1 provides conveying power for the pole piece when winding. The flattening device includes a flattening roller 4 and a distance adjustment mechanism. The flattening roller 4 at least partially covers the pole piece surface of the pole piece 2 to be wound. The flattening roller 4 applies pressure to the pole piece surface to flatten the wrinkles on the surface of the pole piece 2 to be wound. The flattening roller 4 can be a flat roller, a striped roller or a spiral roller. The distance adjustment mechanism is connected to the flattening roller 4, and the distance adjustment mechanism is configured to adjust the distance between the flattening roller 4 and the pole roll 3 to keep it constant.

[0023] When this embodiment is in use, during the process of winding up the pole piece 2, the flattening roller 4 can apply pressure to the surface of the pole piece 2 to be wound up, and the flattening roller 4 continuously flattens the wrinkles on the surface of the pole piece 2 to be wound up, so as to avoid the pole roll 3 from collapsing during the winding process. During the process of the winding roller 1 continuously winding up the pole piece 2 to be wound up, the diameter of the pole roll 3 is continuously increased, and the distance adjustment mechanism adjusts the distance between the flattening roller 4 and the pole roll 3 to avoid interference between the flattening roller 4 and the pole roll 3 due to the distance being too close, and to avoid the flattening effect being unable to be achieved due to the pressure of the flattening roller 4 on the pole piece 2 to be wound up being too small due to the distance being too far.

[0024] Specifically, in one embodiment, Figure 1 and Figure 2 As shown, the flattening device also includes a fixed support frame 5, a flattening roller mounting frame 6 and an angle adjustment assembly. The fixed support frame 5 is connected to the adjustment end of the distance adjustment mechanism. The flattening roller 4 is rotatably connected to the flattening roller mounting frame 6, and the flattening roller mounting frame 6 is rotatably connected to the fixed support frame 5 through a hinge seat 9. The angle adjustment assembly is connected to the fixed support frame 5 and the flattening roller mounting frame 6 respectively, and the angle adjustment assembly is constructed to adjust the angle between the flattening roller mounting frame 6 and the surface of the pole piece 2 to be wound up, thereby adjusting the mutual angle between the first roller axis of the flattening roller 4 and the pole piece surface of the pole piece 2 to be wound up. In this embodiment, the angle between the flattening roller 4 and the surface of the pole piece is controlled by an angle adjustment component, so that the flattening roller 4 pushes the pole piece, causing the surface of the pole piece to partially bulge, thereby increasing the edge tension of the pole piece 2 to be wound up. Under the action of the tension, the middle part of the pole piece 2 to be wound up shrinks in the direction of large tension, so that the middle uncoated area of ​​the pole piece 2 to be wound up is subjected to lateral pulling force, thereby avoiding the collapse of the uncoated area and avoiding the appearance of wrinkles in the uncoated area of ​​the pole roll 3.

[0025] Specifically, Figure 2 As shown, the angle adjustment assembly includes a first adjustment rod 7 and a second adjustment rod 8, the first adjustment rod 7 is detachably connected to the fixed support frame 5 and the flattening roller mounting frame 6, respectively, the second adjustment rod 8 is detachably connected to the fixed support frame 5 and the flattening roller mounting frame 6, respectively, the first adjustment rod 7 and the second adjustment rod 8 are respectively arranged on opposite sides of the hinge seat 9, and the angle adjustment assembly is constructed to adjust the length of the first adjustment rod 7 and the length of the second adjustment rod 8 between the fixed support frame 5 and the flattening roller mounting frame 6. When it is necessary to adjust the angle between the flattening roller 4 and the surface of the pole piece, the length of the first adjustment rod 7 and / or the second adjustment rod 8 can be adjusted.

[0026] Specifically, Figure 2 As shown, the flattening device further includes a flattening roller drive motor 10, which is disposed on the flattening roller mounting frame 6, and the output shaft of the flattening roller drive motor 10 is connected to the flattening roller 4 to drive the flattening roller 4 to rotate. The flattening roller 4 rotates so that when the pole piece 2 to be wound passes through the flattening roller 4, the pole piece 2 to be wound will not have a relatively serious relative friction with the flattening roller 4, thereby avoiding damage to the pole piece 2 to be wound. In some embodiments, the speed ratio of the linear speed of the circumference of the flattening roller 4 to the conveying speed of the pole piece 2 to be wound is any value between 0.8 and 1.2.

[0027] In one embodiment, if Figure 3 As shown, the flattening device includes a first flattening roller 11 and a second flattening roller 12, and the first flattening roller 11 and the second flattening roller 12 are symmetrically arranged on both sides along the pole piece conveying direction. In this embodiment, a plurality of flattening rollers press the pole piece 2 to be wound from both sides, which can further balance the forces on both sides of the pole piece 2 to be wound, thereby optimizing the flattening effect of the pole piece 2 to be wound.

[0028] In one embodiment, if Figure 3 As shown, the pole piece 2 to be wound up includes a first uncoated area 201, a second uncoated area 202, a third uncoated area 203 and a fourth uncoated area 204 uniformly distributed along the width direction. The first outer edge of the first flattening roller 11 is pressed at the first position, the first position is located inside the edge of the pole piece of the pole piece 2 to be wound up, the first inner edge of the first flattening roller 11 is pressed at the second position, the second position is at a distance of -50 mm to 100 mm from the edge of the second uncoated area 202 toward the third uncoated area 203, the first outer edge is the edge of the first flattening roller 11 away from the second flattening roller 12, and the first inner edge is the edge of the first flattening roller 11 close to the second flattening roller 12. The second outer edge of the second flattening roller 12 is pressed at the third position, which is located inside the edge of the pole piece 2 to be rolled up. The second inner edge of the second flattening roller 12 is pressed at the fourth position, which is any value from -50 mm to 100 mm away from the edge of the third uncoated area 203 toward the second uncoated area 202. The second outer edge is the edge of the second flattening roller 12 away from the first flattening roller 11, and the second inner edge is the edge of the second flattening roller 12 close to the first flattening roller 11. In this embodiment, the positions of the first flattening roller and the second flattening roller are limited to prevent the flattening roller from protruding from the edge of the pole piece.

[0029] In one embodiment, the angle between the flattening roller axis of the flattening roller 4 and the pole piece surface of the pole piece 2 to be wound is any value between 45° and 85°, so that the flattening roller 4 can effectively lift the pole piece 2 to be wound.

[0030] Figure 5 FIG. 2 is a partial structural schematic diagram of a flattening device provided by another embodiment of the present application. Figure 4 and Figure 5As shown, the flattening device also includes a fixed frame 13. The distance adjustment mechanism includes a swing arm 14 and a swing drive assembly. The swing arm 14 is hingedly connected to the fixed frame 13, and the flattening roller 4 is arranged on the swing arm 14. The hinge axis of the swing arm 14 and the fixed frame 13 is parallel to the second roller axis of the winding roller 1, and the position of the hinge axis is different from the position of the second roller axis. The swing drive assembly is connected to the swing arm 14 to drive the swing arm 14 to rotate around the hinge axis, and the hinge axis is the hinge axis of the swing arm 14 on the fixed frame 13, so as to drive the flattening roller 4 to approach or move away from the pole roll 3. Specifically, the swing drive assembly also includes a servo motor 15, a driving wheel 16, a driven wheel 17 and a conveyor belt 18. The servo motor 15 is arranged on the fixed frame 13, the driving wheel 16 is connected to the driving shaft of the servo motor 15, the driven wheel 17 is rotatably connected to the fixed frame 13, one end of the swing arm 14 is connected to the wheel axle of the driven wheel 17, and the flattening roller 4 is arranged on the other end of the swing arm 14. The transmission belt 18 is respectively connected to the driving wheel 16 and the driven wheel 17. When the driven wheel 17 rotates, it drives the swing arm 14 to swing. When the swing arm 14 swings, the end of the swing arm 14 on which the flattening roller 4 is mounted approaches or moves away from the pole roll 3, so that the flattening roller 4 approaches or moves away from the pole roll 3, and the distance between the flattening roller 4 and the pole roll 3 can be controlled to remain constant.

[0031] When this embodiment is used, the distance between the flattening roller 4 and the pole roll 3 is controlled by a swinging driving mode. When the servo motor 15 is working, it drives the driving wheel 17 to rotate, and the driving wheel 17 drives the driven wheel 17 to rotate through the transmission belt 18. When the driven wheel 17 rotates, it drives the swing arm 14 to swing, thereby controlling the distance between the flattening roller 4 and the pole roll 3. Generally, the distance between the roller axis of the flattening roller and the roller axis of the winding roller is controlled within the range of 100mm to 2000mm.

[0032] In one embodiment, if Figure 4 As shown, the flattening device also includes a roller 19, which is arranged on the side of the flattening roller 4 away from the winding roller 1. The pole piece 2 to be wound is pressed onto the roller 19 and the flattening roller 4 in turn and then wound into the winding roller 1. The roller 19 can change the conveying direction of the pole piece 2 to be wound.

[0033] In one embodiment, the rotation angle Δθ of the servo motor 15 is 2(arccos(r1 / L)-arocos(r2 / L)), r1 is the radius of the winding roller 1 in an empty roll state, r2 is the current radius of the pole roll 3, and L is the distance between the roller axis of the roller 19 and the roller axis of the winding roller 1. This embodiment can quantitatively calculate the rotation speed of the servo motor 15, thereby quantitatively and accurately controlling the position of the flattening roller.

[0034] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0035] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0036] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0037] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features of this utility model.

[0038] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A flattening device, arranged on the upstream side of a winding roller (1) along the conveying direction of the pole piece, the flattening device is used to flatten the pole piece (2) to be wound up, and the winding roller (1) is used to wind up the pole piece (2) to be wound up and form a pole roll (3); characterized in that: The flattening device comprises: a flattening roller (4), the flattening roller (4) at least partially pressing on the surface of the pole piece (2) to be rolled up so as to flatten the wrinkles on the surface of the pole piece (2) to be rolled up; and A distance adjustment mechanism is connected to the flattening roller (4), and the distance adjustment mechanism is configured to adjust the distance between the flattening roller (4) and the pole roll (3) to keep it constant.

2. The flattening device according to claim 1, characterized in that: The flattening device also includes: A fixed support frame (5) connected to the adjustment end of the distance adjustment mechanism; a flattening roller mounting frame (6), the flattening roller (4) being rotatably connected to the flattening roller mounting frame (6), and the flattening roller mounting frame (6) being rotatably connected to the fixed support frame (5) via an articulated seat (9); and An angle adjustment component is connected to the fixed support frame (5) and the flattening roller mounting frame (6) respectively, and the angle adjustment component is constructed to adjust the angle between the flattening roller mounting frame (6) and the surface of the pole piece (2) to be rolled up, thereby adjusting the mutual angle between the first roller axis of the flattening roller (4) and the pole piece surface of the pole piece (2) to be rolled up.

3. The flattening device according to claim 2, characterized in that: The angle adjustment component comprises: A first adjusting rod (7) and a second adjusting rod (8), wherein the first adjusting rod (7) is detachably connected to the fixed support frame (5) and the flattening roller mounting frame (6), respectively, and the second adjusting rod (8) is detachably connected to the fixed support frame (5) and the flattening roller mounting frame (6), respectively, and the first adjusting rod (7) and the second adjusting rod (8) are respectively arranged on opposite sides of the hinge seat (9), and the angle adjustment assembly is constructed to adjust the length of the first adjusting rod (7) and the length of the second adjusting rod (8) between the fixed support frame (5) and the flattening roller mounting frame (6).

4. The flattening device according to claim 2, characterized in that: The flattening device also includes: A flattening roller drive motor (10) is arranged on the flattening roller mounting frame (6), and an output shaft of the flattening roller drive motor (10) is connected to the flattening roller (4) to drive the flattening roller (4) to rotate.

5. The flattening device according to claim 1, characterized in that: The flattening device comprises a first flattening roller (11) and a second flattening roller (12), wherein the first flattening roller (11) and the second flattening roller (12) are symmetrically arranged on both sides along the pole piece conveying direction.

6. The flattening device according to claim 5, characterized in that: The pole piece (2) to be rolled up comprises a first uncoated area (201), a second uncoated area (202), a third uncoated area (203) and a fourth uncoated area (204) uniformly distributed along the width direction; The first outer edge of the first flattening roller (11) is pressed at a first position, the first position is located inside the edge of the pole piece (2) to be rolled up, the first inner edge of the first flattening roller (11) is pressed at a second position, the second position is at a distance of any value between -50 mm and 100 mm from the edge of the second uncoated area (202) toward the third uncoated area (203), the first outer edge is the edge of the first flattening roller (11) away from the second flattening roller (12), and the first inner edge is the edge of the first flattening roller (11) close to the second flattening roller (12); The second outer edge of the second flattening roller (12) is pressed at a third position, and the third position is located inside the edge of the pole piece (2) to be rolled up. The second inner edge of the second flattening roller (12) is pressed at a fourth position, and the fourth position is at a distance of any value between -50 mm and 100 mm from the edge of the third uncoated area (203) toward the second uncoated area (202). The second outer edge is the edge of the second flattening roller (12) away from the first flattening roller (11), and the second inner edge is the edge of the second flattening roller (12) close to the first flattening roller (11).

7. The flattening device according to any one of claims 1 to 6, characterized in that: The angle between the flattening roller axis of the flattening roller (4) and the pole piece surface of the pole piece (2) to be rolled up is any value between 45° and 85°.

8. The flattening device according to claim 1, characterized in that: Also includes: Fixed frame (13); The distance adjustment mechanism comprises: A swing arm (14) is hingedly connected to the fixed frame (13), and the flattening roller (4) is arranged on the swing arm (14); as well as A swing drive assembly is connected to the swing arm (14) to drive the swing arm (14) to rotate around a hinge shaft of the swing arm (14) on the fixed frame (13) to drive the flattening roller (4) to approach or move away from the pole roll (3).

9. The flattening device according to claim 8, characterized in that: The swing drive assembly also includes: A servo motor (15) is arranged on the fixing frame (13); A driving wheel (16) connected to a driving shaft of the servo motor (15); A driven wheel (17) is rotatably connected to the fixed frame (13); one end of the swing arm (14) is connected to the axle of the driven wheel (17); and the flattening roller (4) is arranged on the other end of the swing arm (14); and A transmission belt (18) is connected to the driving wheel (16) and the driven wheel (17) respectively.

10. The flattening device according to claim 9, characterized in that: Also includes: A passing roller (19) is arranged on a side of the flattening roller (4) away from the winding roller (1), and the pole piece (2) to be wound is pressed onto the passing roller (19) and the flattening roller (4) in sequence and then wound into the winding roller (1); The rotation angle Δθ of the servo motor (15) is 2(arccos(r1 / L)-arocos(r2 / L)), wherein r1 is the radius of the winding roller (1) in an empty roll state, r2 is the current radius of the pole roll (3), and L is the distance between the roller axis of the passing roller (19) and the roller axis of the winding roller (1).

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