Double-station automatic unwinding device for battery pole piece

Abstract

The application provides a battery pole piece double-station automatic unwinding device, which comprises a rack, a rotating frame driven by a speed reducer motor arranged on the rack, pole piece rolls symmetrically arranged on the rotating frame, and respectively located at an unwinding station and a roll changing station. The pole piece rolls to be unwound are rotated to the unwinding station through ascending and descending actions in sequence, and the position of the rack at the roll changing station is provided with a damping device; the rotating frame is further provided with a radially extending force receiving seat, and the side of the force receiving seat is a force receiving surface subjected to damping of the damping device; the damping device is separated from the force receiving seat during the ascending process of the pole piece roll to be unwound; and the damping device applies downward pressure to the force receiving surface of the force receiving seat located at the roll changing station when the pole piece roll to be unwound passes the highest point. The downward pressure applied by the damping device when the pole piece roll passes the highest point offsets the problem of driving force reversal caused by sudden change of gravity direction, avoids damage of the speed reducer motor caused by sudden change of torque, and prolongs the service life of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of unwinding devices, in particular to a double-station automatic unwinding device for battery pole pieces. Background Art

[0002] In the production process of electrode sheets, rolling is a key process to ensure their sealing and thickness consistency. The electrode sheets need to be unwound before rolling, and the traditional single-station unwinding device has the problem of low efficiency when changing rolls. In order to improve production efficiency, Chinese patent CN201420447655.9 proposes a dual-station automatic winding and unwinding device, which realizes continuous unwinding by switching stations and reduces the reel changing time. However, the device has the following problems in actual application: the rolled electrode sheets are heavy (about two tons). During the switching process, when the electrode sheet rotates from a low position to a high position, the reduction motor needs to overcome gravity to do work, and the direction of the driving force is opposite to the direction of gravity; and when the electrode sheet passes the highest point, the direction of the driving force is consistent with the direction of gravity, resulting in a sudden change in force. This sudden change not only easily damages the reduction motor, but also affects the precise positioning of the electrode sheet to the unwinding station.

[0003] To solve the above problems, the existing technology usually adopts an automatic weight balancing solution, that is, using a weight block to compensate for the reduced weight of the electrode sheet. However, this method has the following shortcomings:

[0004] 1. When installing the electrode sheet at the non-unwinding station, the counterweight block needs to be removed and added again when unwinding, which increases the complexity of the operation.

[0005] 2. The total weight of the counterweight is two tons. Frequent loading and unloading may easily lead to casualties or equipment damage.

[0006] 3. The electrode sheet is made of metal, and its density is similar to that of the counterweight. The traditional unwinding device lacks sufficient space to accommodate the required counterweight, making it difficult to achieve effective counterweighting.

[0007] In summary, the existing double-station unwinding device has significant defects in weight mutation, counterweight operation and space utilization. A solution with reasonable structure, stable operation and high safety is urgently needed to improve production efficiency and reduce equipment maintenance costs. Summary of the Invention

[0008] In order to solve the technical problems in the background technology, the present invention discloses a double-station automatic unwinding device for battery pole pieces.

[0009] The present invention provides a dual-station automatic unwinding device for battery electrodes, comprising a frame, a rotating frame driven by a reduction motor, the rotating frame being provided with symmetrically arranged electrode rolls, which are respectively located at an unwinding station and a reel-changing station. The electrode rolls to be unwound are rotated to the unwinding station by ascending and descending actions in sequence, and a damping device is provided at the reel-changing station of the frame.

[0010] The rotating frame is also provided with a radially extending force bearing seat, one side of which is a force bearing surface for the damping device to apply damping;

[0011] When the pole piece roll to be unwound is in the process of rising, the damping device is separated from the force bearing seat;

[0012] When the pole piece roll to be unwound passes the highest point, the damping device applies downward pressure to the force-bearing surface of the force-bearing seat located at the roll-changing station.

[0013] Furthermore, the line connecting the centers of the pole piece rolls on both sides of the rotating frame is the reference line L, and an angle α is formed between the force-bearing surface and the reference line L, so that during the rising process of the pole piece roll to be unwound, the force-bearing seat rotates to a position where the force-bearing surface faces upward, and the damping device contacts the force-bearing surface.

[0014] Furthermore, the damping device includes a brake and a liftable electric cylinder; the driving end of the electric cylinder extends downward to apply pressure to the force-bearing seat; the brake is fixed, and the driving end of the brake is transmission-connected to the cylinder body of the electric cylinder.

[0015] Furthermore, the brake is a magnetic powder brake; during the descent of the pole piece roll to be unwound, the pressure applied by the damping device to the force-bearing surface increases gradually.

[0016] Furthermore, the damping device includes a fixed frame, on which a vertically arranged rack is provided, and the rack can be raised and lowered by a linear guide rail installed on the fixed frame;

[0017] The driving end of the brake is provided with a driving gear meshing with the rack;

[0018] The cylinder body of the electric cylinder is fixedly connected to the rack.

[0019] Furthermore, a connecting gear is meshed between the rack and the driving gear;

[0020] The speed ratio between the connecting gear and the driving gear is greater than 1.

[0021] Furthermore, two rollers are installed on the driving end of the electric cylinder and are rollingly connected to the force bearing seat.

[0022] Furthermore, a wheel frame is mounted on the driving end of the electric cylinder in a hinged manner; and the roller is mounted on the wheel frame.

[0023] Furthermore, a horizontally arranged fixing sleeve is provided on the fixing frame;

[0024] A support column driven by a cylinder is inserted into the fixed sleeve;

[0025] The position of the support column is configured so that when the electrode roll to be unwound rotates to the unwinding station, the support column extends to the lower end of the slider against the linear guide rail;

[0026] The length of the support column is configured such that when the support column is extended, at least one third of the portion is inserted into the fixing sleeve.

[0027] Furthermore, the fixing frame is provided with a horizontally arranged transverse plate and a vertically arranged vertical plate;

[0028] The transverse plate is fixedly connected to the top of the frame;

[0029] The vertical plate is fixedly connected to the side of the frame.

[0030] The beneficial effects of the present invention are:

[0031] 1. The damping device applies downward pressure when the pole piece roll passes the highest point to offset the driving force reversal problem caused by the sudden change in the direction of gravity, avoid damage to the reduction motor due to sudden torque change, and extend the service life of the equipment.

[0032] 2. The damping device dynamically adjusts the pressure (pressure increases) during the descending process of the electrode roll to ensure smooth deceleration of the rotating frame, so that the electrode roll stops accurately at the unwinding station, improving the thickness consistency of the rolling process.

[0033] 3. Abandon the traditional counterweight solution, there is no need to frequently load and unload two-ton counterweights, eliminating the risk of casualties and equipment damage, while reducing non-productive time and improving roll change efficiency.

[0034] 4. The arrangement of the force bearing seat does not require any changes to the structure of the rotating frame, and provides a force bearing point for the damping device within a limited space, making the improved structure simple and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and examples.

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0038] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0039] Figure 4 is a top view of the present invention;

[0040] Figure 5 This is a front view of the present invention, wherein the pole piece roll to be unwound is about to be rotated to the highest position;

[0041] Figure 6 This is a front view of the present invention, wherein the pole piece roll to be unwound is rotated to the highest position;

[0042] Figure 7 This is a front view of the present invention, wherein the pole piece roll to be unwound is rotated to the unwinding station;

[0043] Figure 8 This is a front view of the present invention, wherein the electrode roll to be unwound rotates to the unwinding station and begins to unwind, and the support column is in an extended state at this time;

[0044] Figure 9 is a schematic diagram of the structure of the damping device;

[0045] Figure 10 It is a structural diagram of the damping device from another perspective;

[0046] Figure 11 This is a front view of the present invention, wherein the force bearing seats on both sides are collinear with the rotation centerline of the rotating frame;

[0047] Figure 12 It is a structural diagram of the hidden parts of the present invention;

[0048] In the figure: 1. Frame; 2. Pole coil; 3. Unwinding station; 4. Reel changing station; 5. Force bearing seat; 6. Brake; 7. Electric cylinder; 8. Fixed frame; 9. Rack; 10. Linear guide; 11. Drive gear; 12. Connecting gear; 13. Roller; 14. Wheel frame; 15. Fixed sleeve; 16. Cylinder; 17. Support column; 18. Rotating frame; 19. Elastic linear guide; 20. First sliding frame; 21. Second sliding frame; 22. First pneumatic shaft; 23. Second pneumatic shaft; 24. Unwinding reduction motor; 25. Moving frame; 26. Screw lift; 27. Support cylinder; 28. Support block; 29. ​​V-shaped groove; 30. Tension cylinder; 51. Force-bearing surface; 81. Horizontal plate; 82. Vertical plate; 83. Main body; 84. Fixed rod; 85. Reinforcement rod; 86. Mounting plate; 87. Extension plate. DETAILED DESCRIPTION

[0049] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0050] like Figure 1-4 As shown, the present invention discloses a double-station automatic unwinding device for battery pole pieces, comprising a frame 1 on which a rotating frame 18 driven by a reduction motor is provided, and the rotating shaft thereof is arranged horizontally.

[0051] On one side of the frame 1 is the unwinding station 3, where a two-ton electrode roll 2 with a maximum diameter of 1200mm is unwound, allowing the unwound electrode to enter the rolling mill for rolling. On the other side of the frame 1 is the reel changing station 4, which is used to remove the unwound reel from the rotating frame 18 and install a full electrode roll 2. The electrode roll 2 to be unwound is moved to the unwinding station 3 by sequentially ascending and descending.

[0052] Damping devices are installed at both ends of the rotating frame 18, located at the reel-changing station 4. These devices include an electric cylinder 7 and a brake 6 mounted on a fixed frame 8. The specific structure is as follows: the fixed frame 8 comprises a support frame welded from square tubes and fixedly connected to the frame 1, and a vertically arranged mounting plate 86 welded to the support frame. A vertically arranged linear guide 10 is provided on the side of the mounting plate 86 facing the electrode reel 2. A vertically arranged rack 9 is fixedly mounted on the slider of the linear guide 10, and the upper end of the rack 9 is fixedly connected to the slider. The cylinder body of the electric cylinder 7 is fixed in the middle position of the rack 9, with its driving end facing downward.

[0053] A brake 6 is also mounted on the fixed frame 8. A drive gear 11 is mounted on the drive end of the brake 6, which meshes with the rack 9. When the rack 9 is raised or lowered, the drive end of the brake 6 rotates. When the brake 6 applies braking force, it provides resistance to the rise and fall of the rack 9. In this embodiment, the brake 6 is a magnetic powder brake 6. In other embodiments, electromagnetic brakes, servo brakes, or hydraulic brakes may also be used. Compared to other brakes, magnetic powder brakes offer advantages such as simple structure, low cost, and more precise torque control.

[0054] The end of the rotating frame 18 near the electric cylinder 7 radially extends out from the force bearing seat 5. To increase the strength of the force bearing seat 5, the force bearing seat 5 in this embodiment is made of I-beam. The force bearing seat 5 is provided as two parallel and staggered members extending in opposite directions, and is also staggered from the axis of the rotating frame 18. In other embodiments, the force bearing seat 5 can be provided as two collinear members, or as a single member, both coinciding with the axis of the rotating frame 18 (see FIG. 1 ). Figure 11 ). One side of the force bearing seat 5 is set as the force bearing surface 51 of the damping device. Figure 6 As shown, when the electrode roll 2 to be unwound passes the highest point, the force-bearing seat 5 rotates to the roll-changing station 4 and is arranged obliquely downward. At this time, the electric cylinder 7 descends, and the driving end of the electric cylinder 7 extends to abut against the force-bearing surface 51, applying downward pressure to the force-bearing surface 51.

[0055] Because the angle between the force-bearing seat 5 and the horizontal plane changes as the rotating frame 18 rotates, to improve the stability of the force acting between the electric cylinder 7 and the force-bearing seat 5, a wheel frame 14 is hingedly connected to the lower end of the driving end of the electric cylinder 7. Mounted at the lower end of the wheel frame 14 are two rollers 13 that contact the force-bearing seat 5 and are arranged along the length of the force-bearing seat 5. When the force-bearing seat 5 swings, the wheel frame 14 automatically changes its angle with the horizontal plane due to the hinged connection, allowing the rollers 13 to apply stable pressure to the force-bearing seat 5.

[0056] The setting of the connection position between the slider and the rack 9, as well as the setting of the connection position between the rack 9 and the electric cylinder 7, can minimize the length of the slide rail and the rack 9 while ensuring that the rack 9 and the gear will not disengage, and the slider and the slide rail will not disengage. This not only reduces costs, but also improves the structural stability of the damping device, avoiding the slide rail and the rack 9 from being too long, resulting in large flexibility and large shaking, thereby affecting the normal operation of the damping device.

[0057] The specific structure of the support frame is as follows: Figure 9 and Figure 10 As shown, the lower end of the support frame is provided with a main body 83 which is welded into a rectangular parallelepiped by a square tube, as shown in FIG. Figure 3 As shown, a horizontally arranged transverse plate 81 is welded to the lower end of the main body 83 and is fixedly connected to the upper end of the frame 1 via bolts. A rectangular connecting frame extends downward from the lower end of the main body 83, and a vertical plate 82 is welded to the connecting frame. The vertical plate 82 is fixedly connected to the side of the frame 1 via bolts.

[0058] A vertically arranged fixing rod 84 extends upward from the outer end of the main body 83 and is fixedly connected to the back side of the mounting plate 86. An obliquely arranged reinforcing rod 85 is welded between the fixing rod 84 and the main body 83.

[0059] The support frame is limited in two directions, so that the position of the fixing frame 8 is also more stable. In addition, the setting of the fixing rod 84 and the reinforcing rod 85 can further improve the structural strength of the mounting plate 86 to ensure the stable operation of the damping device.

[0060] When the pole piece roll 2 to be unwound passes the highest point, the electric cylinder 7 descends, and the driving end of the electric cylinder 7 extends to abut against the upper end surface of the force-bearing seat 5, and applies downward pressure to the force-bearing seat 5 to offset the driving force reversal problem caused by the sudden change in the direction of gravity, thereby avoiding damage to the reduction motor due to the sudden change in torque and extending the service life of the equipment.

[0061] Moreover, the present application replaces the traditional counterweight design, eliminating the risk of casualties and equipment damage, while reducing non-productive time and improving roll-changing efficiency.

[0062] The arrangement of the force bearing seat 5 does not require modification of the structure of the rotating frame 18 and provides a force bearing point for the damping device within a limited space, making the improved structure simple and low-cost.

[0063] like Figure 8 As shown, when the pole piece roll 2 is unwound and the workstation is switched, and the pole piece roll 2 to be unwound rises, the drive shaft of the electric cylinder 7 rises and separates from the force-bearing seat 5, so that the rotating frame 18 can rotate unhindered.

[0064] In order to increase the resistance of the damping device, reduce the current of the brake 6 and save energy, a connecting gear 12 is also installed on the fixed frame 8. Its specific installation structure is: a vertically arranged connecting plate is installed on the main body 83, and a bearing seat is installed on the connecting plate. Two parallel bearings are installed in the bearing seat, and one end of the connecting gear 12 is provided with an integrally formed rotating shaft, which is inserted into the bearing to realize the rotational connection.

[0065] Connecting gear 12 is disposed between rack 9 and drive gear 11 and meshes with both. The speed ratio between connecting gear 12 and drive gear 11 is greater than 1. In this embodiment, the speed ratio between connecting gear 12 and drive gear 11 is 1.5. This arrangement provides greater resistance to the rise and fall of rack 9 while maintaining the current drawn by brake 6. This reduces the current drawn by brake 6 while maintaining the resistance drawn by rack 9, thereby achieving energy savings.

[0066] As the unwinding electrode roll 2 descends, the torque increases. Therefore, as the electrode roll 2 descends, the current of the brake 6 is gradually increased to increase the resistance of the electric cylinder 7 to the force-bearing seat 5, achieving a force balance. This allows the rotating frame 18 to decelerate smoothly, allowing the electrode roll 2 to accurately stop at the unwinding station 3, thereby improving the thickness consistency of the rolling process.

[0067] The line connecting the centers of the pole piece rolls 2 on both sides of the rotating frame 18 is the reference line L; the conventional force-bearing surface 51 is parallel to the reference line L. With this arrangement, when the pole piece roll 2 to be unwound rises to the highest point, the damping device cannot contact the force-bearing surface 51; therefore, when the pole piece roll 2 to be unwound passes the highest point and a sudden change in force occurs, an impact will occur between the damping device and the force-bearing seat 5, causing damage. Therefore, the position of the force-bearing seat 5 is set to: the angle between the force-bearing surface 51 and the reference line L forms an angle α, α=45±5°, so that before the pole piece roll 2 to be unwound rotates to the highest point, the force-bearing surface 51 is in an upward position (reference Figure 5 ), at this time, the brake 6 is de-energized, the cylinder body of the electric cylinder 7 descends under the action of gravity, and the drive rod of the electric cylinder 7 extends downward, preferentially contacting the force-bearing surface 51. In other embodiments, the brake 6 can also be energized so that the cylinder body of the electric cylinder 7 remains in position, and the drive rod of the electric cylinder 7 extends downward, preferentially contacting the force-bearing surface 51.

[0068] When the pole piece roll 2 starts to unwind (refer to Figure 7 ), generally, the position of the rotating frame 18 is kept stable by continuously supplying power to the brake 6. This arrangement consumes a lot of power and is also costly. Figure 6 As shown, the top position of the mounting plate 86 extends vertically outward from the extension plate 87, and a horizontally arranged fixing sleeve 15 is installed on the extension plate 87, and a horizontally arranged support column 17 is inserted into the fixing sleeve 15. A cylinder 16 is also installed on the extension plate 87 to drive the support column 17 to move horizontally, approaching or moving away from the linear guide rail 10. When the pole piece roll 2 to be unwound rotates to the unwinding station, the slider moves to the top position of the mounting plate 86. At this time, the cylinder 16 drives the support column 17 to extend. The upper end face of the support column 17 abuts against the lower end face of the slider, supporting the slider and allowing the electric cylinder 7 to maintain its position and state stable when the brake 6 is no longer in effect. With this arrangement, the brake 6 can remain in a de-energized state, achieving the effect of saving electricity.

[0069] To prevent support column 17 from exerting radial pressure on cylinder 16 and potentially damaging it, support column 17 is configured so that, when extended, at least one-third of it is inserted into retaining sleeve 15. This arrangement allows the reaction force of the slider against support column 17 to act solely on retaining sleeve 15, preventing damage to cylinder 16.

[0070] The working principle of the present invention is: Figure 12 As shown, the rotating frame 18 is installed on both sides of the pole piece roll 2, and two sets of symmetrically arranged elastic linear guides 19 are provided at the end of each side, and the elastic linear guides 19 extend axially toward the rotating frame 18. The sliders of the elastic linear guides 19 are respectively installed with a first sliding frame 20 and a second sliding frame 21. The first sliding frame 20 is provided with a threaded fastening bolt, the threaded end of which abuts against the rotating frame 18, which is used to adjust the position of the first sliding frame 20 to accommodate pole piece rolls 2 of different lengths. A tensioning cylinder 30 is installed at one end of the rotating frame 18 close to the second sliding frame 21, and its driving end is fixedly connected to the second sliding frame 21 to drive the second sliding frame 21 to move.

[0071] Mounted on the first and second carriages 20 and 21 are first and second pneumatic shafts 22 and 23, respectively, which are rotatably connected via bearings and arranged opposite each other. These shafts are used to insert into the winding shaft of the electrode roll 2. Mounted on the first carriage 20 is an unwinding reduction motor 24, whose drive end is connected to the first pneumatic shaft 22, for driving the electrode roll 2 to rotate and unwind.

[0072] A moving frame 25 is also mounted on another set of sliders of the elastic linear guide 19. Horizontally arranged screw elevators 26 are mounted on both ends of the rotating frame 18 to drive the moving frame 25 to slide. A support cylinder 27 is mounted on the moving frame 25. A support block 28 is mounted on the driving end of the support cylinder 27. A V-shaped groove 29 is provided on the side of the support block 28 facing the reel of the pole piece reel 2 to support the reel of the pole piece reel 2.

[0073] The steps for changing the roll are:

[0074] S1, start the screw lift 26 to drive the moving frame 25 to move toward each other;

[0075] S2, hoisting the electrode roll 2 to the roll changing station 4;

[0076] S3, start the support cylinder 27, drive the support block 28 to rise, and support both ends of the pole piece roll 2;

[0077] S4, start the tensioning cylinder 30, drive the second air expansion shaft 23 to move toward the pole piece roll 2, and insert it into the reel of the pole piece roll 2; at the same time, push the pole piece roll 2 to move toward the unwinding reduction motor 24, so that the first air expansion shaft 22 is also inserted into the reel of the pole piece roll 2;

[0078] S5, the first and second air-expansion shafts 22 and 23 are inflated and expanded, and tightened with the winding shaft of the pole piece roll 2;

[0079] S6. Drive the supporting cylinder 27 and the tensioning cylinder 30 in reverse direction to reset the supporting block 28 and separate it from the pole piece roll 2.

[0080] The specific steps of station switching of the present invention are:

[0081] T1. Start the reduction motor to drive the rotating frame 18 to rotate, so that the pole piece roll 2 to be unwound rises; at the same time, the driving shaft of the electric cylinder 7 rises synchronously and disengages from the force-bearing seat 5, so that the force-bearing seat 5 can pass over the roller 13 without hindrance;

[0082] T2. When the pole piece roll 2 continues to rise until the force-bearing surface 51 is arranged obliquely upward, the following two states occur: 1. The brake 6 loses power, the cylinder body of the electric cylinder 7 descends under the action of gravity, and the drive shaft of the electric cylinder 7 extends downward and contacts the force-bearing surface 51; 2. The brake 6 is energized, and the damping generated by it keeps the cylinder body of the electric cylinder 7 in place. At this time, the drive shaft of the electric cylinder 7 extends and contacts the force-bearing surface 51. In both cases, the brake 6 does not produce a damping effect on the force-bearing surface 51.

[0083] T3, when the pole piece roll 2 continues to rise to the highest point, the force bearing seat 5 pushes the cylinder body of the electric cylinder 7 to rise, and the state of the brake 6 remains unchanged;

[0084] T4, when the pole piece roll 2 passes the highest point, the brake 6 is powered or the current is increased, to damp the descent of the pole piece roll 2;

[0085] T5, as the pole piece roll 2 continues to descend, the current of the brake 6 is increased;

[0086] T6, when the pole piece roll 2 rotates to the unwinding station 3, the cylinder 16 drives the support column 17 to abut against the lower end of the slider on the linear guide rail 10;

[0087] T7, the brake 6 is powered off, and the unwinding deceleration motor 24 starts to unwind;

[0088] T8, when the pole piece roll 2 is unwound, the steps T1-T7 are recycled, and the roll changing and unwinding actions are continuously performed.

[0089] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A battery electrode double-station automatic unwinding device, comprising a frame (1), a rotating frame (18) driven by a reduction motor being provided on the frame (1), the rotating frame (18) being provided with symmetrically arranged electrode rolls (2), which are respectively located at an unwinding station (3) and a reel-changing station (4), the electrode rolls (2) to be unwound being rotated to the unwinding station (3) by ascending and descending actions in sequence, and characterized in that: The frame (1) is provided with a damping device at the roll changing station (4); The rotating frame (18) is further provided with a radially extending force-bearing seat (5), one side of which is a force-bearing surface (51) on which the damping device applies damping; When the pole piece roll (2) to be unwound is in the process of rising, the damping device is separated from the force bearing seat (5); When the pole piece roll (2) to be unwound passes the highest point, the damping device applies downward pressure to the force-bearing surface (51) of the force-bearing seat (5) located at the roll-changing station (4); The line connecting the centers of the pole piece rolls (2) on both sides of the rotating frame (18) is a reference line L, and an angle α is formed between the force-bearing surface (51) and the reference line L, so that during the rising process of the pole piece roll (2) to be unwound, the force-bearing seat (5) rotates to a position where the force-bearing surface (51) faces upward, and the damping device contacts the force-bearing surface (51); The damping device includes a brake (6) and a liftable electric cylinder (7); The driving end of the electric cylinder (7) extends downward to apply pressure to the force-bearing seat (5); The brake (6) is fixed, and the driving end of the brake (6) is in transmission connection with the cylinder body of the electric cylinder (7); The brake (6) is a magnetic powder brake; During the descent of the pole piece roll (2) to be unwound, the pressure applied by the damping device to the force-bearing surface (51) increases gradually; The damping device comprises a fixed frame (8), a vertically arranged rack (9) is provided on the fixed frame (8), and the rack (9) can be raised and lowered via a linear guide rail (10) mounted on the fixed frame (8); The driving end of the brake (6) is provided with a driving gear (11) meshing with the rack (9); The cylinder body of the electric cylinder (7) is fixedly connected to the rack (9).

2. The dual-station automatic unwinding device for battery pole pieces according to claim 1, characterized in that: A connecting gear (12) is also engaged between the rack (9) and the driving gear (11); The speed ratio between the connecting gear (12) and the driving gear (11) is greater than 1.

3. The dual-station automatic unwinding device for battery pole pieces according to claim 1, characterized in that: Two rollers (13) are installed on the driving end of the electric cylinder (7) and are rollingly connected to the force bearing seat (5).

4. The dual-station automatic unwinding device for battery pole pieces according to claim 3, characterized in that: The driving end of the electric cylinder (7) is hingedly mounted with a wheel frame (14); the roller (13) is mounted on the wheel frame (14).

5. The dual-station automatic unwinding device for battery pole pieces according to claim 2, characterized in that: The fixing frame (8) is further provided with a horizontally arranged fixing sleeve (15); A support column (17) driven by a cylinder (16) is inserted into the fixed sleeve (15); The position of the support column (17) is configured such that when the pole piece roll (2) to be unwound rotates to the unwinding station (3), the support column (17) extends to the lower end of the slider against the linear guide rail (10); The length of the support column (17) is configured such that when the support column (17) is extended, at least one third of the support column (17) is inserted into the fixing sleeve (15).

6. The dual-station automatic unwinding device for battery pole pieces according to claim 2, characterized in that: The fixing frame (8) is provided with a horizontally arranged transverse plate (81) and a vertically arranged vertical plate (82); The transverse plate (81) is fixedly connected to the top of the frame (1); The vertical plate (82) is fixedly connected to the side of the frame (1).

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