Lithium battery core stacking tail roll device

Abstract

The utility model discloses a lithium battery core stacking tail winding device which comprises a rack, a core stacking tail winding mechanism is assembled and connected to the rack, the core stacking tail winding mechanism comprises a moving assembly, a telescopic assembly is installed on the moving assembly, and the core stacking tail winding mechanism further comprises a winding assembly matched with the telescopic assembly. The winding assembly comprises a winding component and an axis pay-off component installed on the winding component. The telescopic assembly is used for tensioning the axis unwound by the axis unwinding component. In the core and tail winding process, the stacked core which is not subjected to tail winding is placed between the axes, the stacked core diaphragm is placed on the outer sides of the axes, and the winding assembly and the telescopic assembly synchronously rotate to complete tail winding. The tail winding device is flexible and easy to operate, and in the tail winding process, the automatic sliding degree is high, and the tail winding device can be used for core stacking tail winding of various specifications and sizes, so that practicability, flexibility and universality are high, and the defects that in the tail winding core stacking process, the operation difficulty is large, and the working efficiency is low are greatly reduced.

Description

Technical Field

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

[0002] There are two process routes for forming lithium-ion battery cells: winding and stacking. Winding has higher production efficiency and is a relatively mature process. However, compared with the stacking process, the winding process has its own problems. The stress of the pole pieces in the core is difficult to release, the internal resistance of the cell is large, the pole pieces are prone to breakage at the folding point after hot pressing, and the cell is prone to lithium deposition. The stacking process can well solve or reduce these problems.

[0003] After lamination, the core stack, especially the one produced by Z-type lamination, needs to be wound to prevent wrinkling of the outer separator and short circuit in the cell. Currently, the lamination machines of various suppliers all use four winding needles to clamp the upper and lower edges of the core stack. This method has many disadvantages:

[0004] 1. The minimum thickness of the winding needle is 1.5mm and cannot be thinner. Thinner thickness will reduce the rigidity of the winding needle and make it easy to bend. After clamping, the middle part will be arched, resulting in loose outer diaphragm wrapping after the tail is rolled. During hot pressing, the diaphragm will wrinkle and affect the hot pressing effect.

[0005] 2. The winding needle with appropriate length needs to be matched according to the size of the stacked core, which increases the cost of changing models when producing batteries of different sizes;

[0006] 3. After replacement, it takes a long time to debug, which increases labor costs and reduces production efficiency. Utility Model Content

[0007] Based on the above background, the purpose of the present invention is to provide a lithium battery core tail winding device.

[0008] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0009] A lithium battery core winding device includes a frame, a core winding mechanism is mounted on the frame, the core winding mechanism includes a moving assembly, a telescopic assembly is mounted on the moving assembly, and the core winding mechanism further includes a winding assembly that cooperates with the telescopic assembly;

[0010] The winding assembly includes a winding component and an axis pay-off component installed on the winding component;

[0011] The telescopic assembly is used to tighten the axis of the unwinding axis pay-off component;

[0012] During the core stacking tail winding process, the core stacking material that has not been tail wound is unloaded between the axes, and the core stacking diaphragm is placed on the outside of the axis. The tail winding is completed after the winding assembly and the telescopic assembly rotate synchronously.

[0013] Preferably, the frame includes a bottom plate and a vertical plate perpendicular to the outside of the bottom plate;

[0014] The moving assembly includes a screw slide rail fixedly mounted on the vertical plate, a screw cavity is defined in the screw slide rail, and a screw is rotatably connected in the screw cavity;

[0015] The moving assembly further comprises a first motor mounted at the end of the lead screw slide rail, and the moving assembly further comprises a slide plate threadedly connected to the lead screw, and the telescopic assembly is fixedly mounted on the slide plate.

[0016] Preferably, a long rectangular sliding opening is formed on the lead screw slide rail, and the slide plate includes a convex plate portion threadedly connected to the lead screw, and the convex plate portion passes through the long rectangular sliding opening;

[0017] The slide plate further includes a U-shaped plate portion fixedly connected to the convex plate portion, and the upper and lower ends of the U-shaped plate portion are respectively limited and slid on the top and bottom of the screw slide rail;

[0018] When the lead screw drives the slide plate to slide, the convex plate portion slides on the long rectangular sliding opening.

[0019] Preferably, the telescopic assembly includes a fixed end plate fixedly mounted on the slide, a second motor is mounted on the fixed end plate, and an output shaft of the second motor is fixedly connected to the first end plate;

[0020] A first core stack locking structure for locking one end of the core stack is fixedly connected to the inner side wall of the first end plate;

[0021] Both ends of the inner side wall of the first end plate are respectively fixedly connected with an axis locking structure for locking the axis;

[0022] The axis locking structure is located on both sides of the first stacked core locking structure.

[0023] Preferably, the first stacked core locking structure includes a first double-claw cylinder, wherein the two piston rods of the first double-claw cylinder are respectively fixedly connected to a first pressure block, the first pressure block is fixedly connected to a first pressure plate, and the end of one end of the stacked core is locked between the first pressure plates;

[0024] The axis locking structure includes a first double-rod cylinder, and a first wire pressure plate is fixedly connected to the two piston rods of the first double-rod cylinder. The upper and lower ends of the first end plate are fixedly connected to a second wire pressure plate that cooperates with the first wire pressure plate, and the axis locking is positioned on the first wire pressure plate and the second wire pressure plate.

[0025] Preferably, the winding component comprises a stand plate fixedly mounted at a top position of the bottom plate;

[0026] A third motor is mounted on the stand plate, and an output shaft of the third motor is fixedly connected to the second end plate;

[0027] A second core stacking locking structure that cooperates with the first core stacking locking structure is fixedly connected to the second end plate;

[0028] A pair of axis line-releasing components cooperating with the axis locking structure are fixedly connected to the second end plate, and the axis line-releasing components are located on both sides of the second stacked core locking structure.

[0029] Preferably, the second stacked core locking structure includes a second double-claw cylinder, the two piston rods of the second double-claw cylinder are respectively fixedly connected to a second pressure block, the second pressure block is fixedly connected to a second pressure plate, and the end of the other end of the stacked core is locked between the second pressure plates;

[0030] The axis pay-off component includes an axis pay-off motor, the axis pay-off motor is fixedly connected to a rotating shaft, and the rotating shaft is fixedly connected to a pair of pay-off wheels;

[0031] During the unwinding process of the axis, the pay-off wheels at the upper and lower ends pay out the axis, and the free end of the axis is locked on the axis locking structure.

[0032] Preferably, a bearing rotatably connected to the rotating shaft is fixedly connected to the second end plate;

[0033] The upper and lower ends of the second end plate are fixedly connected with arc-shaped limiting plates that cooperate with the pay-off wheel;

[0034] The bottom of the axis pay-off motor is fixedly mounted on the second end plate via a motor mounting bracket.

[0035] Preferably, the bottom plate is equipped with a roller mechanism for tensioning the stacked cores;

[0036] The roller mechanism includes a U-shaped roller seat, in which a roller is rotatably connected; the roller and the bottom of the U-shaped roller seat have a lifting space.

[0037] The roller mechanism further includes a fourth motor, the output shaft of which is fixedly mounted with a lifting screw; the lifting screw is threadedly connected to the center position of the U-shaped roller seat;

[0038] Both ends of the U-shaped roller seat are slidably connected with sliding guide rods, the bottom plate is fixedly connected with a bottom fixing seat, the fourth motor is fixedly installed on the bottom fixing seat, and the sliding guide rods are fixedly connected to the top position of the bottom fixing seat.

[0039] The utility model has the following beneficial effects:

[0040] 1. In the process of tail winding, there is no need to use the traditional winding needle tail winding, which solves the existing tail winding process. The thinner the winding needle thickness is, the less hardness of the winding needle is, and it is easy to bend. After clamping, the middle part is arched, resulting in loose coating of the outer diaphragm after the tail winding, and the diaphragm is wrinkled during hot pressing, affecting the hot pressing effect; the cost of changing models increases when producing batteries of different sizes; after replacing the winding needle, it takes a long time to debug, which increases labor costs and reduces production efficiency. Technical defects.

[0041] 2. The tail winding device disclosed in the present invention is not only flexible and easy to operate, but also has a high degree of automatic sliding during the tail winding process, and can be used for tail winding of stacked cores of various specifications and sizes. Therefore, it has great practicality, flexibility and versatility, and greatly reduces the defects of high operating difficulty and low work efficiency in the tail winding and stacking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0043] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0044] Figure 2 This is a structural diagram of a mobile assembly in an embodiment of the present utility model;

[0045] Figure 3 This is a schematic structural diagram of the telescopic assembly in an embodiment of the present utility model;

[0046] Figure 4 This is a schematic structural diagram of a winding assembly in an embodiment of the present utility model;

[0047] Figure 5 This is a schematic structural diagram of the roller mechanism in an embodiment of the present utility model;

[0048] Figure 6 This is a structural diagram of a double U-shaped roller seat in an embodiment of the present utility model;

[0049] Figure 7 The embodiment of the utility model is a schematic diagram of the positional relationship between the diaphragm, the axis, and the stacked core during the tail winding process. The purpose of the utility model, the functional characteristics and advantages will be further explained with reference to the accompanying drawings in conjunction with the embodiment. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0052] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0053] Example 1

[0054] like Figure 1-7 As shown, a lithium battery core tail winding device includes a frame (the shape of the frame is: the frame includes a base plate 1 and a vertical plate 11 perpendicular to the outside of the base plate 1), the frame is equipped with a core tail winding mechanism, the core tail winding mechanism includes a moving component 2 (the moving component 2 includes a component installed on the vertical plate 11), the moving component 2 is equipped with a telescopic component 3, the core tail winding mechanism also includes a winding component 4 cooperating with the telescopic component 3; the winding component 4 includes a winding part and an axis pay-off part installed on the winding part; the telescopic component 3 is used to tighten the axis A of the axis pay-off part.

[0055] During the core tail winding process, the core B that has not been tail wound is discharged between the axes A, and the diaphragm C of the core B is placed outside the axis A. The winding component 4 and the telescopic component 3 rotate synchronously to complete the tail winding.

[0056] Through the above-mentioned Angshi, there is no need for tail winding using a needle in the process of processing the stacked core B. This tail winding method effectively solves the technical defects of the prior art in which the stacked core B is processed using a needle, which causes difficulty in matching the stacked core B with the needle and replacing the needle, resulting in difficulty in tail winding during lithium battery processing.

[0057] Example 2

[0058] like Figure 1-7 As shown, this embodiment builds on the structure of Example 1, with the moving assembly 2 comprising a screw rail 21 fixedly mounted on the vertical plate 11. A screw cavity is defined within the screw rail 21, within which a screw 221 is rotatably connected (according to conventional methods, a bearing rotatably connected to the screw is mounted on the screw rail 21). Furthermore, a first motor 22 is mounted at the front end of the screw rail 21, which drives the screw 221 to rotate.

[0059] The moving assembly 2 further includes a slide plate 23 threadedly connected to the lead screw 221 , and the telescopic assembly 3 is fixedly mounted on the slide plate 23 .

[0060] Specifically, a long rectangular sliding opening 211 is opened on the lead screw slide rail 21 , and the slide plate 23 includes a convex plate portion 232 threadedly connected to the lead screw, and the convex plate portion 232 passes through the long rectangular sliding opening 211 .

[0061] At the same time, the slide plate 23 also includes a U-shaped plate portion fixedly connected to the protruding plate portion 232, and the upper and lower ends of the U-shaped plate portion are respectively limited and slid on the top and bottom of the screw slide rail 21. When the screw drives the slide plate 23 to slide, the protruding plate portion 232 slides on the long rectangular sliding opening 211.

[0062] During operation, the slide plate 23 is pushed toward the winding assembly 4 by the lead screw, the axis A of the unwinding axis unwinding component on the winding assembly 4 is locked, and then moved in the opposite direction to the tightening axis A.

[0063] Example 3

[0064] like Figure 1-7 As shown, in this embodiment, based on the structure of embodiment 2, the telescopic assembly 3 includes a fixed end plate 31 fixedly mounted on the slide 23 (specifically: a first triangular connecting plate 231 is fixedly connected to the slide 23, a second triangular connecting plate is fixedly connected to the fixed end plate 31, and the first triangular connecting plate 231 and the second triangular connecting plate are fastened by bolts).

[0065] At the same time, a second motor 32 is installed on the fixed end plate 31, and the output shaft of the second motor 32 is fixedly connected to the first end plate 33; a first core locking structure for locking one end of the core stack B is fixedly connected to the inner side wall of the first end plate 33.

[0066] At the same time, both ends of the inner side wall of the first end plate 33 are respectively fixedly connected with axis A locking structures for locking the axis A; the axis A locking structures are located on both sides of the first stacked core locking structure.

[0067] Specifically, the first core stack locking structure includes a first double-claw cylinder 35 (the cylinder barrel of the first double-claw cylinder 35 is fixedly installed on the first end plate 33), and the two piston rods of the first double-claw cylinder 35 are respectively fixedly connected to the first pressure block 351, and the first pressure block 351 is fixedly connected to the first pressure plate 3511. The end of one end of the core stack B is locked between the first pressure plate 3511.

[0068] The axis A locking structure includes a first double-rod cylinder 34, and the two piston rods of the first double-rod cylinder 34 are fixedly connected to a first wire pressing plate 341. The upper and lower ends of the first end plate 33 are fixedly connected to a second wire pressing plate 342 that cooperates with the first wire pressing plate 341. The axis A is locked and positioned on the first wire pressing plate 341 and the second wire pressing plate 342.

[0069] During operation, the piston rods at the top and bottom of the first double-rod cylinder 34 drive the first wire pressing plate 341 to push toward the second wire pressing plate 342 until the free end approaches the axis A and is locked between the first wire pressing plate 341 and the second wire pressing plate 342.

[0070] The winding component includes a stand plate 12 fixedly mounted on the top of the base plate 1 ; a third motor 44 is mounted on the stand plate 12 , and an output shaft of the third motor 44 is fixedly connected to the second end plate 41 .

[0071] At the same time, a second core stack locking structure that cooperates with the first core stack locking structure is fixedly connected to the second end plate 41. The second core stack locking structure cooperates with the first core stack locking structure to lock both ends of the core stack B.

[0072] Specifically, the second core stack locking structure includes a second double-claw cylinder 42, and the two piston rods of the second double-claw cylinder 42 are respectively fixedly connected with a second pressure block 421, and the second pressure block 421 is fixedly connected with a second pressure plate 4211, and the end of the other end of the core stack B is locked between the second pressure plates 4211.

[0073] At the same time, in order to realize the unwinding axis A, a pair of axis unwinding components cooperating with the axis A locking structure are fixedly connected to the second end plate 41, and the axis unwinding components are located on both sides of the second stacked core locking structure.

[0074] The axis pay-off component includes an axis A pay-off motor 43, to which a rotating shaft is fixedly connected, and a pair of pay-off wheels 431 are fixedly connected on the rotating shaft; during the process of unwinding axis A, the pay-off wheels 431 at the upper and lower end positions pay off axis A, and the free end of axis A is locked on the axis A locking structure.

[0075] According to the existing method, a bearing rotatably connected to the rotating shaft is fixedly connected to the second end plate 41 (the inner ring of the bearing is fixedly connected to the rotating shaft).

[0076] At the same time, the upper and lower ends of the second end plate 41 are fixedly connected to arc-shaped limiting plates 4311 that cooperate with the pay-off wheel 431. Specifically, the outline of the pay-off wheel 431 is limited within the arc-shaped opening of the arc-shaped limiting plates 4311. Because the axis A is wound in the wheel groove of the pay-off wheel 431, the axis A maintains a safe distance from the arc-shaped opening, which does not affect the unwinding of the axis A.

[0077] At the same time, the bottom of the axis A pay-off motor 43 is fixedly mounted on the second end plate 41 via a motor mounting bracket.

[0078] During the tail winding process, after axis A is tightened as described above, the stacked core B, which has not yet been tail-wound, is delivered to the four axes A of the tail winding mechanism by the stack unloading robot (not shown) on the existing equipment. At this point, the tail diaphragm of the stacked core B is outside of axis A. At this point, the second pressing block 421-second pressing plate 4211 and the first pressing block 351-first pressing plate 3511 on both sides are locked and positioned on the two sides of the main body of the stacked core B in the length direction.

[0079] At this time, the third motor 44 drives the second end plate 41 and the second motor 32 drives the first end plate 33 to rotate synchronously, and the core stack B positioned between the end plates is wound a certain number of times according to the process requirements and the tail roll is completed.

[0080] Then, the unloading robot clamps the stacked core B behind the tail roll and unloads it.

[0081] Example 4

[0082] like Figure 1-6 As shown, based on the structure of Example 3, in order to achieve slight tensioning of the stacked cores B during the tail winding process, a roller mechanism 5 for tensioning the stacked cores B is assembled and connected to the base plate 1.

[0083] Specifically, the roller mechanism 5 includes a U-shaped roller seat 52 , in which a roller 51 is rotatably connected; a lifting space is defined between the roller 51 and the bottom of the U-shaped roller seat 52 .

[0084] At the same time, the roller mechanism 5 also includes a fourth motor 54, and the output shaft of the fourth motor 54 is fixedly installed with a lifting screw 541; the lifting screw 541 is threadedly connected to the center position of the U-shaped roller seat 52; the two ends of the U-shaped roller seat 52 are slidably connected with a sliding guide rod 53, and the bottom fixing seat is fixedly connected to the bottom plate 1, the fourth motor 54 is fixedly installed on the bottom fixing seat, and the sliding guide rod 53 is fixedly connected to the top position of the bottom fixing seat.

[0085] During operation, when the tail is being rolled, the fourth motor 54 drives the lead screw to lift the U-shaped roller seat 52 (during the lifting process, there is a certain distance between the lead screw and the bottom of the roller). After the U-shaped roller seat 52 and the roller 51 are lifted, the rolling surface of the roller 51 always keeps a slight contact with the stacked core B.

[0086] After the core stacking B is completed, the U-shaped roller seat 52-roller is reset. At this time, the axis A is released. After the axis A is released, the pay-off wheel 431 is reversed and reeled back to the core stacking B to complete the entire tail winding operation.

[0087] Example 5

[0088] like Figure 1-7 As shown, this embodiment builds on the structure of Example 4. To cope with the tail roll of the longer stacked core B, the roller mechanism 5 is designed as a double U-shaped roller seat 52. That is, two U-shaped roller seats 52 are connected together, and each U-shaped roller seat 52 is equipped with a roller. At the same time, a trapezoidal support frame 55 is fixedly connected between the bottoms of the U-shaped roller seats 52, and a lifting screw 541 is threadedly connected to the trapezoidal support frame 55. At the same time, a sliding guide rod 53 slides the trapezoidal support frame 55, so that the fourth motor 54 pushes and lowers the trapezoidal support frame 55 via the lifting screw 541, thereby raising and lowering the double U-shaped roller seat 52-roller structure.

[0089] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A lithium battery core tail winding device, characterized in that: The machine comprises a frame, on which a core stacking tail winding mechanism is assembled and connected, the core stacking tail winding mechanism comprises a moving assembly, a telescopic assembly is mounted on the moving assembly, and the core stacking tail winding mechanism further comprises a winding assembly cooperating with the telescopic assembly; The winding assembly includes a winding component and an axis pay-off component installed on the winding component; The telescopic assembly is used to tighten the axis of the unwinding axis pay-off component; During the core stacking tail winding process, the core stacking material that has not been tail-wound is unloaded between the axes, and the core stacking diaphragm is placed on the outside of the axis. The core stacking tail winding is completed after the winding assembly and the telescopic assembly rotate synchronously.

2. The lithium battery core tail winding device according to claim 1, characterized in that: The frame includes a bottom plate and a vertical plate perpendicular to the outside of the bottom plate; The moving assembly includes a screw slide rail fixedly mounted on the vertical plate, a screw cavity is defined in the screw slide rail, and a screw is rotatably connected in the screw cavity; The moving assembly further comprises a first motor mounted at the end of the lead screw slide rail, and the moving assembly further comprises a slide plate threadedly connected to the lead screw, and the telescopic assembly is fixedly mounted on the slide plate.

3. The lithium battery core tail winding device according to claim 2, characterized in that: The lead screw slide rail is provided with a long rectangular sliding opening, and the slide plate includes a convex plate portion threadedly connected to the lead screw, and the convex plate portion passes through the long rectangular sliding opening; The slide plate further includes a U-shaped plate portion fixedly connected to the convex plate portion, and the upper and lower ends of the U-shaped plate portion are respectively limited and slid on the top and bottom of the screw slide rail; When the lead screw drives the slide plate to slide, the convex plate portion slides on the long rectangular sliding opening.

4. The lithium battery core tail winding device according to claim 2, characterized in that: The telescopic assembly includes a fixed end plate fixedly mounted on the slide, a second motor is mounted on the fixed end plate, and an output shaft of the second motor is fixedly connected to the first end plate; A first core stack locking structure for locking one end of the core stack is fixedly connected to the inner side wall of the first end plate; Both ends of the inner side wall of the first end plate are respectively fixedly connected with an axis locking structure for locking the axis; The axis locking structure is located on both sides of the first stacked core locking structure.

5. The lithium battery core tail winding device according to claim 4, characterized in that: The first stacked core locking structure includes a first double-claw cylinder, wherein the two piston rods of the first double-claw cylinder are respectively fixedly connected to a first pressure block, and the first pressure block is fixedly connected to a first pressure plate, and the end of one end of the stacked core is locked between the first pressure plates; The axis locking structure includes a first double-rod cylinder, and a first wire pressure plate is fixedly connected to the two piston rods of the first double-rod cylinder. The upper and lower ends of the first end plate are fixedly connected to a second wire pressure plate that cooperates with the first wire pressure plate, and the axis locking is positioned on the first wire pressure plate and the second wire pressure plate.

6. The lithium battery core stacking tail winding device according to claim 5, characterized in that: The winding component includes a stand plate fixedly mounted at the top position of the base plate; A third motor is mounted on the stand plate, and an output shaft of the third motor is fixedly connected to the second end plate; A second core stacking locking structure that cooperates with the first core stacking locking structure is fixedly connected to the second end plate; A pair of axis line-releasing components cooperating with the axis locking structure are fixedly connected to the second end plate, and the axis line-releasing components are located on both sides of the second stacked core locking structure.

7. The lithium battery core tail winding device according to claim 6, characterized in that: The second stacked core locking structure includes a second double-claw cylinder, the two piston rods of the second double-claw cylinder are respectively fixedly connected to a second pressure block, the second pressure block is fixedly connected to a second pressure plate, and the end of the other end of the stacked core is locked between the second pressure plates; The axis pay-off component includes an axis pay-off motor, the axis pay-off motor is fixedly connected to a rotating shaft, and the rotating shaft is fixedly connected to a pair of pay-off wheels; During the unwinding process of the axis, the pay-off wheels at the upper and lower ends pay out the axis, and the free end of the axis is locked on the axis locking structure.

8. The lithium battery core tail winding device according to claim 7, characterized in that: A bearing rotatably connected to the rotating shaft is fixedly connected to the second end plate; The upper and lower ends of the second end plate are fixedly connected with arc-shaped limiting plates that cooperate with the pay-off wheel; The bottom of the axis pay-off motor is fixedly mounted on the second end plate via a motor mounting bracket.

9. The lithium battery core tail winding device according to claim 2, characterized in that: The bottom plate is equipped with a roller mechanism for tensioning the stacked cores.

10. The lithium battery core tail winding device according to claim 9, characterized in that: The roller mechanism includes a U-shaped roller seat, in which a roller is rotatably connected; the roller and the bottom of the U-shaped roller seat have a lifting space. The roller mechanism further includes a fourth motor, the output shaft of which is fixedly mounted with a lifting screw; the lifting screw is threadedly connected to the center position of the U-shaped roller seat; Both ends of the U-shaped roller seat are slidably connected with sliding guide rods, the bottom plate is fixedly connected with a bottom fixing seat, the fourth motor is fixedly installed on the bottom fixing seat, and the sliding guide rods are fixedly connected to the top position of the bottom fixing seat.

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