WO2021008388A1 - Pole piece winding apparatus and pole piece winding method - Google Patents

Abstract

A pole piece winding apparatus (1) and a pole piece winding method. The pole piece winding apparatus (1) comprises: a pole piece unwinding device (2) for driving a material roll to output a pole piece to a receiving position; a pole piece feeding device (3) provided downstream the pole piece unwinding device (2), the pole piece feeding device (3) comprising a pole piece clamping component (31) and a driving component (32), the pole piece clamping component (31) being connected to the driving component (32), the pole piece feeding device (3) being able to clamp, at the receiving position, a section to be winded (50) of the pole piece by means of the pole piece clamping component (31), the pole piece feeding device (3) driving, by means of the driving component (32), the pole piece clamping component (31) to move reciprocally between the receiving position and a feeding position; and a pole piece winding device (4) provided downstream the pole piece feeding device (3), the pole piece winding device (4) comprising a winding member (41) for winding the pole piece; and in the feeding position, the pole piece feeding device (3) is able to directly feed the section to be winded (50) to the winding member (41). The pole piece winding apparatus (1) can ensure that the section to be winded (50) of the pole piece has a controllable tensioning force, reducing the possibility of displacement, bending and fracture easily occurring when the section to be winded (50) enters the winding member (41).

Description

Pole piece winding equipment and pole piece winding method

Cross references to related applications

This application claims the priority of the Chinese patent application 201910636229.7 named "Pole Piece Winding Equipment" filed on July 15, 2019, and the entire content of this application is incorporated herein by reference.

Technical field

This application relates to the technical field of battery processing equipment, in particular to a pole piece winding device and a pole piece winding method.

Background technique

In the production process of power lithium batteries, winding equipment is required to wind the pole pieces into batteries. In the initial step of winding, the winding needle pre-winds a certain number of layers of inner and outer diaphragms, and then the pole piece is sent to the winding needle, and finally the pole piece and the diaphragm are wound together by the winding needle. However, in the winding process of the prior art, the winding section of the pole piece (which can be the initial section or the end section of the pole piece to enter the winding needle) before fully entering the winding needle, the winding section of the pole piece will be freely suspended Therefore, there is no tension in the winding section of the pole piece, and the winding section of the pole piece is easily displaced and deviated, causing problems such as displacement, bending and folding when entering the winding needle, and affecting the winding quality of the battery.

Summary of the invention

The embodiments of the application provide a pole piece winding device and a pole piece winding method, which can ensure that the winding section of the pole piece has a controllable tension force, and reduce the winding section caused by the winding section being in a freely suspended state. When entering the winding needle, it is prone to problems such as displacement, bending and discounting.

On the one hand, an embodiment of the present application proposes a pole piece winding device, which includes:

The pole piece unwinding device is used to drive the material roll to the receiving position to output the pole pieces; the pole piece feeding device is arranged downstream of the pole piece unwinding device, and the pole piece feeding device includes a pole piece clamping assembly and a driving assembly, The pole piece clamping assembly is connected with the driving assembly. The pole piece feeding device can clamp the winding section of the pole piece at the receiving position through the pole piece clamping assembly. The pole piece feeding device drives the pole piece clamping assembly through the driving assembly. It moves back and forth between the receiving and feeding positions; the pole piece winding device is arranged downstream of the pole piece feeding device. The pole piece winding device includes a winding needle for winding the pole pieces; at the feeding position, the pole piece feeding The device can directly convey the winding section to the winding needle.

According to an aspect of the embodiment of the present invention, the pole piece clamping assembly includes a first roller frame, a driving roller, a first power source, a second roller frame, a driven roller, and a second power source, and the second roller frame is movably connected In the first roller frame, one of the driven roller and the driving roller is arranged in the second roller frame, the other is arranged in the first roller frame, the driven roller is arranged parallel to the driving roller, and the first power source is opposite to the driving roller. Connected, the second power source drives one of the driven roller and the driving roller to move closer to or away from the other by driving the second roller frame to clamp or release the winding section, and the drive assembly is connected to the first roller frame .

According to one aspect of the embodiment of the present invention, the pole piece feeding device further includes a first guide rail, the first guide rail extends along the direction of the driven roller approaching or away from the driving roller, and the second roller frame is linearly movably connected to the first guide rail. A roller frame, the second power source drives the second roller frame to move linearly along the first guide rail; or,

The second power source includes a swing cylinder, the second roller frame is connected with the swing cylinder, and the second roller frame is driven to swing by the swing cylinder.

According to an aspect of the embodiment of the present invention, the first roller frame has two cantilever beams spaced apart along the axial direction of the active roller and a connecting rod connecting the two cantilever beams, and the second power source is connected to the first roller frame and is located in the connecting rod. In the space enclosed by the rod and the cantilever beam, the second roller frame is movably connected to the connecting rod.

According to an aspect of the embodiment of the present invention, the driven roller has two end portions opposed to each other in the axial direction of the driven roller and an intermediate section arranged between the two end portions, and the axial dimension of the driving roller is smaller than the axial dimension of the driven roller , The middle section of the driving roller and the driven roller are arranged correspondingly along the radial direction of the driving roller; or,

The driving roller has two opposite ends in the axial direction of its own and a middle section arranged between the two ends. The axial dimension of the driven roller is smaller than that of the driving roller. The middle section of the driven roller and the driving roller Correspondingly arranged along the radial direction of the driving roller.

According to one aspect of the embodiment of the present invention, the driving assembly includes a second guide rail and a driving part, the pole piece clamping assembly is linearly movably connected to the second guide rail, and the output end of the driving part is connected to the pole piece clamping assembly to drive the pole piece clamping assembly. The sheet clamping assembly moves along the second guide rail, so that the pole sheet clamping assembly reciprocates at the receiving position and the feeding position; or,

The driving assembly includes a telescopic component and a driving component, the telescopic component is connected with the pole piece clamping component, and the driving component drives the telescopic component to move, so that the pole piece clamping component reciprocates at the receiving position and the feeding position; or,

The drive assembly includes a lead screw and a drive part, the lead screw is threadedly connected with the pole piece clamping assembly, and the drive part drives the lead screw to rotate, so that the pole piece clamping assembly reciprocates at the receiving position and the feeding position.

According to one aspect of the embodiment of the present invention, the pole piece feeding device further includes a first position sensor, the first position sensor is arranged at the drive assembly or the pole piece clamping assembly, and the first position sensor is used to detect the position of the pole piece clamping assembly .

According to one aspect of the embodiment of the present invention, the pole piece feeding device further includes a correction assembly, the correction assembly includes a bracket, a third rail and a third power source, the third rail and the third power source are arranged on the bracket, and the third rail moves along the active The roller extends in the axial direction, the driving assembly is movably arranged on the third guide rail, and the third power source drives the driving assembly to move along the third guide rail.

According to one aspect of the embodiment of the present invention, the pole piece feeding device further includes a second position sensor, the second position sensor is arranged on the bracket or the drive assembly, and the second position sensor is used to detect the position of the drive assembly.

According to an aspect of the embodiment of the present invention, the pole piece winding device further includes a pole piece guide assembly, the pole piece guide assembly is arranged upstream of the pole piece clamping assembly, and the pole piece guide assembly is used to guide the roll-in section into the pole piece clamping As for the assembly, the pole piece guide assembly includes a material passing gap, and the material passing gap is gradually reduced along the direction away from the pole piece clamping assembly to close to the pole piece clamping assembly.

According to one aspect of the embodiment of the present invention, the pole piece winding device further includes a winding guide assembly that is arranged downstream of the pole piece clamping assembly, and the winding guide assembly includes a fixing frame and a detachable connection to the fixing frame. The guide is used to support and guide the roll-in section.

According to one aspect of the embodiment of the present invention, the pole piece unwinding device further includes a feeding assembly, the feeding assembly is arranged upstream of the pole piece feeding device, the feeding assembly includes a pole piece clamping unit and a fourth power source, the pole piece clamping unit It is used to clamp the pole piece at the tape receiving position, and the fourth power source drives the pole piece clamping unit to move back and forth between the tape receiving position and the material receiving position.

According to one aspect of the embodiment of the present invention, the pole piece clamping unit includes a clamping roller group and a pole piece support assembly arranged downstream of the clamping roller group, the clamping roller group includes a first clamping roller and a second clamping roller, The first clamping roller and the second clamping roller are close to or away from each other to clamp or release the pole piece. The pole piece support assembly includes a first support plate and a second support plate. The pole piece can be supported from the first support plate and the second support plate. Pass between the boards.

According to one aspect of the embodiment of the present invention, the pole piece unwinding device further includes a pole piece cutting assembly, the pole piece cutting assembly is arranged on the path of the feeding assembly moving from the tape receiving position to the material receiving position, and the pole piece cutting assembly is used to cut off the pole piece. The sheet and pole sheet cutting assembly includes a knife seat and a cutter that are arranged oppositely.

According to the pole piece winding device of the embodiment of the present application, the roll-in section of the pole piece is clamped by the pole piece feeding device, and the roll-in section is directly conveyed to the winding needle under the drive of the drive assembly. In this way, when the winding section enters the winding needle, the pole piece feeding device can provide a controllable tension force for the winding section, and reduce the occurrence of the winding section entering the winding needle due to the free suspension state of the winding section. Possibility of problems such as displacement, bending and discount, and improve the quality of battery winding.

On the other hand, the embodiment of the present application also proposes a pole piece winding method, including:

Drive the material roll to output pole piece at the receiving position;

The pole piece clamping component of the pole piece feeding device clamps the winding section of the pole piece at the receiving position, and the driving component of the pole piece feeding device drives the pole piece clamping component to move back and forth between the receiving position and the feeding position;

The winding needle of the pole piece winding device winds the pole piece; at the feeding position, the pole piece feeding device directly transports the winding section to the winding needle.

According to the pole piece winding method of the embodiment of the present application, the pole piece clamping assembly of the pole piece feeding device clamps the winding section of the pole piece, and the winding section is directly conveyed to the winding needle under the drive of the driving assembly. In this way, when the winding section enters the winding needle, the pole piece feeding device can provide a controllable tension force for the winding section, and reduce the occurrence of the winding section entering the winding needle due to the free suspension state of the winding section. Possibility of problems such as displacement, bending and discount, and improve the quality of battery winding.

Description of the drawings

The features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the drawings.

Fig. 1 is a schematic diagram of a use state of a pole piece winding device according to an embodiment of the present application;

2 is a schematic structural view of a pole piece feeding device according to an embodiment of the present application;

3 is a schematic structural view of the pole piece feeding device shown in FIG. 2 from a second perspective;

Figure 4 is a partial enlarged view of A in Figure 1;

Figure 5 is a partial enlarged view of B in Figure 4;

Fig. 6 is a second schematic diagram showing the use state of the pole piece winding device of the embodiment shown in Fig. 1;

FIG. 7 is a three schematic diagram showing the use state of the pole piece winding device of the embodiment in FIG. 1;

Fig. 8 is a fourth schematic diagram showing the use state of the pole piece winding device of the embodiment shown in Fig. 1.

In the drawings, the drawings may not be drawn to actual scale.

Mark description:

1. Pole piece winding equipment;

2. Pole piece unwinding device;

3. Pole piece feeding device; 31, pole piece clamping assembly; 311, first roller frame; 311a, cantilever beam; 311b, connecting rod; 312, driving roller; 313, first power source; 314, second roller Frame; 315, driven roller; 316, second power source; 32, drive assembly; 321, base; 322, second rail; 323, drive component; 33, first rail; 34, first position sensor; 35 , Correction component; 351, bracket; 352, third guide rail; 353, third power source; 36, second position sensor;

4. Pole piece winding device; 41, winding needle; 41a, half shaft; 42, turntable;

5. Pole piece guide assembly; 51. Passing gap;

6. Roll-in guide assembly; 61. Fixing frame; 62. Guide; 621. Support and guide surface; 621a, first arc-shaped concession section; 621b, middle straight section; 621c, second arc-shaped concession section;

7. Feeding component; 71, pole piece clamping unit; 711, clamping roller group; 711a, first clamping roller; 711b, second clamping roller; 712, pole piece support assembly; 712a, first support plate; 712b. The second support plate;

8. Pole piece cutting assembly; 81. Knife holder; 82. Cutter;

9. Diaphragm guide assembly; 91. Guide roller; 92. Telescopic rod;

10. Inner diaphragm;

20. Outer diaphragm;

30. Anode sheet;

40. Cathode sheet;

50. Into the volume section.

Detailed ways

The implementation of the present application will be described in further detail below in conjunction with the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principles of the application, but cannot be used to limit the scope of the application, that is, the application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", and " The orientation or positional relationship indicated by “outside” is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to the present application. Application restrictions. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

In the description of this application, it should be noted that the terms "installation", "connection", and "connection" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they may be fixed connections or alternatively. Disassembly connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in this application can be understood according to the specific circumstances.

In order to better understand the present application, the following describes the embodiments of the present application with reference to FIGS. 1 to 8.

Referring to FIG. 1, an embodiment of the present application provides a pole piece winding device 1 for winding pole pieces and diaphragms to form a battery core. The pole piece may be an anode piece 30 or a cathode piece 40. The pole piece winding device 1 includes a pole piece unwinding device 2, a pole piece feeding device 3 and a pole piece winding device 4.

The pole piece unwinding device 2 is used to drive the material roll to output the pole piece to the material receiving position. The pole piece feeding device 3 is arranged downstream of the pole piece unwinding device 2. Here, downstream or upstream refers to the sequence of battery cell production, and does not limit the spatial position between components. The pole piece feeding device 3 includes a pole piece clamping assembly 31 and a driving assembly 32. The pole piece clamping assembly 31 is connected with the driving assembly 32. The pole piece feeding device 3 clamps the winding section 50 of the pole piece at the material receiving position through the pole piece clamping assembly 31. Here, the winding section 50 refers to the starting or ending section of the pole piece to enter the winding needle 41 . The beginning section here refers to the initial section of the pole piece used for the initial winding stage to enter the winding needle, and the ending section is the end section on the pole piece used for the ending winding stage to enter the winding needle. The pole piece feeding device 3 can drive the pole piece clamping assembly 31 to move back and forth between the receiving position and the feeding position through the driving assembly 32. The feeding position refers to the moving limit position of the pole piece feeding device 3 when the pole piece feeding section 50 is transported to the winding needle 41. The pole piece winding device 4 is arranged downstream of the pole piece feeding device 3. The pole piece winding device 4 includes a winding needle 41 for winding the diaphragm and the pole piece.

At the feeding position, the pole piece feeding device 3 can directly convey the winding section 50 to the winding needle 41. During the winding process of the initial section of the pole piece, the pole piece clamping assembly 31 of the pole piece feeding device 3 clamps the initial section at the material receiving position. The pole piece clamping assembly 31 always clamps the starting section when moving from the material receiving position to the feeding position, so that the pole piece clamping assembly 31 can provide a controllable tension force for the starting section. After the initial section enters the winding needle 41 and is tightened by the winding needle 41, the pole piece clamping assembly 31 releases the initial section and retreats from the feeding position to the receiving position, waiting to clamp the end section of the pole piece. After the winding needle 41 winds the pole piece of a predetermined length, the pole piece clamping assembly 31 clamps the pole piece in advance, and then the pole piece is cut by the pole piece cutting assembly 8 to form a finishing section. The pole piece clamping assembly 31 always clamps the finishing section when moving from the material receiving position to the feeding position, so that the pole piece clamping assembly 31 can provide a controllable tension force for the finishing section. After the finishing section enters the winding needle 41, the pole piece clamping assembly 31 releases the finishing section and retreats from the feeding position to the receiving position, waiting for the next starting section of the pole piece to be clamped, and then finishing a winding or finishing process. There is no need to provide other clamping rollers or clamping mechanisms between the pole piece feeding device 3 and the winding needle 41, but the initial section or ending section of the pole piece is directly transported to the winding needle 41 through the pole piece feeding device 3. If another clamping roller or clamping mechanism is provided between the pole piece feeding device 3 and the winding needle 41, the pole piece feeding device 3 is required to transport the pole piece to the clamping roller or clamping mechanism, and then pass the clamping roller Or the clamping mechanism drives the pole piece into the winding needle 41. In this way, on the one hand, the distance between the pole piece roll-in section 50 conveyed by the clamping roller or the clamping mechanism and the winding pin 41 is too large, resulting in the winding section 50 The free end is prone to wrinkles and bulges, and at the same time, the winding section 50 is difficult to match the high-speed winding state of the winding needle 41; on the other hand, the winding needle 41 pulls the winding section 50 into the winding by applying friction to the pole piece through the diaphragm. The diaphragm will be stretched under the action of the friction of the pole piece, and it is prone to wrinkles, which ultimately affects the performance of the battery.

In this embodiment, the roll-in section 50 of the pole piece feeding device 3 is directly transported to the winding needle 41. On the one hand, the roll-in section 50 of the pole piece can be transported to an area very close to the winding needle 41, so the winding section The free end of 50 without tension can be reserved very short, thus effectively solving the uncontrollable free state of the winding section 50 and the problem of folding, bending or wrinkling bulge; on the other hand, because the winding section 50 is transported To the area very close to the winding needle 41, the winding section 50 needs to move with a short path distance, which is well adapted to the high-speed winding of the winding needle 41.

In the pole piece winding device 1 of the embodiment of the present application, the starting section or the ending section of the pole piece is clamped by the pole piece feeding device 3, and the starting section or the ending section is directly conveyed to the winding needle under the drive of the drive assembly 32 41. In this way, when the initial section or the ending section enters the winding needle 41, the pole piece feeding device 3 can provide a controllable tension force for the initial section or the ending section, and reduce the damage caused by the initial section or the ending section being in a freely suspended state. This leads to the possibility of problems such as displacement, bending and discounting when entering the winding needle 41 in the initial section or the final section, and improves the winding quality of the battery. The pole piece feeding device 3 can shorten the distance between the initial section or the end section and the winding needle 41, so as to ensure that the winding section 50 is well adapted to the high-speed winding of the winding needle 41.

As shown in FIG. 1, the pole piece winding device 4 includes a turntable 42 and two winding needles 41 arranged on the turntable 42. After one of the winding needles 41 completes the winding process, the turntable 42 rotates so that the completed winding needle 41 leaves the winding position and is in the unloading position, while the other winding needle 41 enters the winding position. The winding needle 41 includes two semi-shafts 41a that can be opened and closed. In the winding process, the two half shafts 41 a or one of the half shafts 41 a are opened in the horizontal direction to form a vertical center gap. The ends of the inner diaphragm 10 and the outer diaphragm 20 are aligned with the center gap in the axial direction of the winding needle 41. Then, the two half shafts 41a move from the rear side to the front side in the axial direction of the winding needle 41 so that the ends of the inner diaphragm 10 and the outer diaphragm 20 enter the center gap. The two half shafts 41a are closed again to clamp the ends of the inner diaphragm 10 and the outer diaphragm 20. The winding needle 41 is rotated to wind a predetermined number of layers of the inner diaphragm 10 and the outer diaphragm 20 in advance, and then the cathode sheet 40 is directly transported between the inner diaphragm 10 and the winding needle 41 through a pole piece feeding device 3, and passes through the other pole piece. The sheet feeding device 3 directly conveys the anode sheet 30 between the outer diaphragm 20 and the inner diaphragm 10. Finally, the anode sheet 30 and the cathode sheet 40 are each wound by the winding needle 41 together with the inner diaphragm 10 and the outer diaphragm 20 under the action of the friction force of the adjacent diaphragm. The number of winding needles 41 provided on the turntable 42 is not limited to two, and may be one or more than three.

As shown in Figure 1, the pole piece unwinding device 2 unwinds to output the pole piece. The feeding assembly 7 clamps the pole piece from the tape receiving position and moves to the receiving position, and then conveys the winding section 50 of the pole piece to the pole piece feeding device 3 at the receiving position. The tape connection position refers to the position where the feeding assembly 7 is to clamp the pole piece output by the pole piece unwinding device 2. The receiving position refers to the position of the pole piece conveyed by the pole piece feeding device 3 to be clamped and taken by the feeding assembly 7. The feeding assembly 7 is used to support and transport the pole pieces, and reduce the possibility of the pole pieces sag or cannot accurately enter the pole piece clamping assembly 31 due to the long transmission path from the pole piece unwinding device 2 to the pole piece feeding device 3. The two pole piece feeding devices 3 at the material receiving position clamp the initial section of the anode piece 30 to be rolled and the initial section of the cathode piece 40 to be rolled through their respective pole piece clamping assemblies 31. The initial section to be rolled can pass through the pole piece clamping assembly 31 at least partially, thereby ensuring clamping stability and reliability. At this time, the pole piece clamping assembly 31 applies a controllable tension force to most or the whole of the initial section, thereby maintaining the tension state.

2 and 3, the pole piece clamping assembly 31 includes a first roller frame 311, a driving roller 312, a first power source 313, a second roller frame 314, a driven roller 315, and a second power source 316. The second roller frame 314 is movably connected to the first roller frame 311. The driven roller 315 and the driving roller 312 are arranged in parallel. The parallelism here is not limited to absolute parallel in geometric meaning, and can also refer to substantially parallel within the manufacturing tolerance range. Optionally, the driven roller 315 and the driving roller 312 are both cylindrical rollers, and their axes are parallel to each other. The first power source 313 can drive the driving roller 312 to rotate. The first power source 313 may be a motor.

In one example, the active roller 312 is rotatably connected to the first roller frame 311. The first power source 313 is connected to the first roller frame 311 and the output end is connected to the active roller 312. The driven roller 315 is rotatably connected to the second roller frame 314. The second power source 316 is connected to the first roller frame 311 and the output end is connected to the second roller frame 314. The second power source 316 can drive the second roller frame 314 to drive the driven roller 315 to move in a direction approaching or away from the driving roller 312, thereby reducing or increasing the gap between the driven roller 315 and the driving roller 312, so that The driving roller 315 and the driving roller 312 clamp or release the winding section 50 of the pole piece. In another example, the driven roller 315 is rotatably connected to the first roller frame 311. The driving roller 312 is rotatably connected to the second roller frame 314. The first power source 313 is connected to the second roller frame 314 and the output end is connected to the active roller 312. The second power source 316 is connected to the first roller frame 311 and the output end is connected to the second roller frame 314. The second power source 316 can drive the second roller frame 314 to drive the driving roller 312 to move closer to or away from the driven roller 315, thereby reducing or increasing the gap between the driven roller 315 and the driving roller 312, so that The driving roller 315 and the driving roller 312 clamp or release the winding section 50 of the pole piece.

During the winding process of the winding section 50, the driving roller 312 and the driven roller 315 clamp the winding section 50 of the pole piece. The first power source 313 drives the driving roller 312 to rotate and drives the driven roller 315 to rotate synchronously, and the linear speed of the driving roller 312 is the same as the linear speed of the winding needle 41, so that the winding section 50 can always maintain tension during the entire winding process status. At any time during the entire winding process, the winding section 50 can maintain basically the same tension state. On the one hand, since the linear speed of the driving roller 312 is the same as the linear speed of the winding needle 41, the pole piece clamping assembly 31 is reduced. Excessive tension applied to the winding section 50 with the winding needle 41 may cause the winding section 50 to break or crack; on the other hand, when the driving roller 312 rotates, the winding section 50 of the pole piece is driven to the winding needle 41 The feeding can effectively reduce the problems of wrinkles, bulges and stretches of the diaphragm caused by the winding section 50 of the pole piece when the winding needle 41 pre-winds the diaphragm.

In an example, referring to FIG. 2, the pole piece feeding device 3 further includes a first guide rail 33. The first guide rail 33 extends in the radial direction of the driving roller 312. The second roller frame 314 is linearly movably connected to the first roller frame 311 via the first guide rail 33. The second roller frame 314 can be driven to move linearly along the first guide rail 33 by the second power source 316, so that one of the driven roller 315 and the driving roller 312 moves closer to or away from the other. The first guide rail 33 may be a linear guide rail. The second power source 316 may be an electric cylinder or a hydraulic cylinder. By providing the first guide rail 33 between the first roller frame 311 and the second roller frame 314, the stability of the movement process of the second roller frame 314 can be improved. In another example, the pole piece feeding device 3 further includes a lead screw. The axial direction of the lead screw is perpendicular to the axial direction of the driving roller 312. The second roller frame 314 is threadedly connected with the lead screw. The second power source 316 is used to drive the lead screw to rotate so that the second roller frame 314 can move along the axial direction of the lead screw, so that the second roller frame 314 drives one of the driven roller 315 and the driving roller 312 to approach or move away The other moves. The second power source 316 may be an electric motor. In yet another example, the second power source 316 may be a swing cylinder. The second roller frame 314 is connected with the swing shaft of the swing cylinder. The swing plane of the swing axis of the swing cylinder is perpendicular to the axial direction of the driving roller 312. The swing cylinder drives the second roller frame 314 to swing to move one of the driven roller 315 and the driving roller 312 closer to or away from the other.

In one embodiment, referring to FIG. 2, the first roller frame 311 has two cantilever beams 311 a spaced apart along the axial direction of the active roller 312 and a connecting rod 311 b connecting the two cantilever beams 311 a. The connecting rod 311b extends along the axial direction of the driving roller 312. Both ends of the connecting rod 311b are respectively connected to the middle area of the cantilever beam 311a. The second power source 316 is connected to the connecting rod 311b and is located in the space enclosed by the connecting rod 311b and the cantilever beam 311a. Along the radial direction of the driving roller 312, the second power source 316 and the second roller frame 314 are respectively arranged on both sides of the connecting rod 311b. In this way, the pole piece clamping assembly 31 has a compact overall structure and saves installation space.

In one example, the active roller 312 is arranged between two cantilever beams 311a. The end of the driving roller 312 is rotatably connected to the cantilever beam 311a. The driven roller 315 is disposed on the second roller frame 314 and located inside the driving roller 312. In another example, the driven roller 315 is disposed between the two cantilever beams 311a. The end of the driven roller 315 is rotatably connected to the cantilever beam 311a. The driving roller 312 is disposed on the second roller frame 314 and located inside the driven roller 315.

In one example, the driven roller 315 has two opposite ends in the axial direction of the driven roller 315 and a middle section arranged between the two ends. The axial dimension of the driving roller 312 is smaller than the axial dimension of the driven roller 315, and the entire middle section of the driving roller 312 and the driven roller 315 is arranged corresponding to the radial direction of the driving roller 312. In another example, the active roller 312 has two opposite ends in the axial direction of the active roller and a middle section disposed between the two ends. The axial dimension of the driven roller 315 is smaller than the axial dimension of the driving roller 312, and the whole of the driven roller 315 and the middle section of the driving roller 312 are arranged corresponding to the radial direction of the driving roller 312. In this way, when the driven roller 315 and the driving roller 312 clamp the roll-in section 50, the two edges of the roll-in section 50 along its own width will not be clamped by the driving roller 312 and the driven roller 315, and the roll-in section 50 is lowered. The two edges of 50 may be wrinkled under the action of extrusion stress, which improves the quality of the wound battery. Optionally, the diameter of the driving roller 312 is smaller or larger than the diameter of the driven roller 315.

In one embodiment, referring to FIG. 2, the driving assembly 32 includes a base 321, a second guide rail 322 and a driving component 323. The pole piece clamping assembly 31 is linearly movably connected to the second guide rail 322, and is connected to the base 321 through the second guide rail 322. The first roller frame 311 of the pole piece clamping assembly 31 is slidably connected to the second guide rail 322. The first roller frame 311 includes a connecting plate connected with the second guide rail 322. The cantilever beam 311 a extends from the connecting plate in a direction away from the second guide rail 322. There is an obtuse angle between the projection of the cantilever beam 311a along the axis of the driving roller 312 and the projection of the connecting plate along the axis of the driving roller 312, which reduces the interference of the connecting plate with the pole pieces clamped by the driven roller 315 and the driving roller 312 and is prone to damage. Possibility of pole piece. The driving component 323 is connected and fixed to the base 321. The output end of the driving component 323 is connected to the pole piece clamping assembly 31 to drive the pole piece clamping assembly 31 to move along the second guide rail 322 so that the pole piece clamping assembly 31 reciprocates at the receiving position and the feeding position. In one example, the driving part 323 includes a motor and a transmission belt connected to the base 321. The transmission belt is connected with the first roller frame 311 of the pole piece clamping assembly 31. The motor drives the transmission belt to rotate, thereby driving the first roller frame 311 to linearly reciprocate along the second guide rail 322. The motor can be a servo motor. The base 321 is a frame structure, which can reduce its own weight.

In another embodiment, the driving assembly 32 includes a telescopic part and a driving part 323. The telescopic part is connected with the pole piece clamping assembly 31. The driving component 323 drives the telescopic component to expand and contract, so that the pole piece clamping assembly 31 reciprocates at the receiving position and the feeding position. Alternatively, the driving assembly 32 may be an electric cylinder or a pneumatic cylinder. In yet another embodiment, the driving assembly 32 includes a lead screw and a driving part 323. The lead screw is threadedly connected with the pole piece clamping assembly 31. The driving component 323 drives the lead screw to rotate, so that the pole piece clamping assembly 31 reciprocates at the receiving position and the feeding position. In one example, the driving part 323 may be a servo motor.

Referring to FIG. 2, the pole piece feeding device 3 further includes a first position sensor 34. The first position sensor 34 is disposed in the driving assembly 32 or the pole piece clamping assembly 31. The first position sensor 34 is used to detect the position of the pole piece clamping assembly 31. In one example, the first position sensor 34 may be a linear displacement sensor. In another example, the first position sensor 34 includes a proximity switch. The proximity switch is installed and fixed on the base 321, and a trigger plate is installed on the first roller frame 311. or. The proximity switch is installed and fixed on the first roller frame 311, and a trigger plate is installed on the base 321. The trigger board can trigger the proximity switch. Optionally, the number of proximity switches is three, so that when the pole piece clamping assembly 31 moves to the receiving position, the feeding position, or the middle position between the receiving position and the feeding position, the trigger plate can trigger the corresponding approach switch. The first position sensor 34 can accurately detect the position of the pole piece clamping assembly 31 to improve the position accuracy of the pole piece clamping assembly 31 and ensure that the pole piece clamping assembly 31 accurately stays at the predetermined position of the receiving or feeding position. It is beneficial to improve the accuracy of the material receiving and feeding of the pole piece clamping assembly 31, thereby helping to improve the accuracy of the winding position of the winding section 50.

As shown in FIG. 3, the pole piece feeding device 3 further includes a correction component 35 for adjusting the position of the pole piece before being rolled along the width direction of the pole piece. The width direction of the pole piece is perpendicular to the transmission direction of the pole piece. The correction assembly 35 includes a bracket 351, a third guide rail 352 and a third power source 353. The third guide rail 352 and the third power source 353 are installed on the bracket 351. The third guide rail 352 extends along the axial direction of the driving roller 312. The driving assembly 32 is movably disposed on the third guide rail 352. The third power source 353 drives the entire driving assembly 32 to move linearly along the third guide rail 352. In an example, the third power source 353 may be a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder. The output end of the third power source 353 is connected to the base 321 of the driving assembly 32. The correction assembly 35 can drive the entire driving assembly 32 and the pole piece clamping assembly 31 to move synchronously along the width direction of the pole piece. When the roll-in section 50 and the diaphragm are misaligned in the width direction, the pole piece clamping assembly 31 is driven to move through the correction assembly 35 to correct the roll-in section 50 clamped by the pole piece clamping assembly 31 , So that the winding section 50 and the diaphragm are aligned in the width direction, which is beneficial to improve the winding quality of the battery and the product qualification rate. In an example, the pole piece winding device 1 further includes an industrial camera or a photoelectric position sensor (not shown in the figure) for detecting the alignment of the winding section 50 and the diaphragm in the width direction. When detecting that the roll-in section 50 and the diaphragm are misaligned in the width direction, a detection signal is sent to the controller. After the controller analyzes and processes the detection signal, it controls the correction component 35 to perform correction actions on the winding section 50.

In an embodiment, referring to FIG. 3, the pole piece feeding device 3 further includes a second position sensor 36. The second position sensor 36 is disposed on the bracket 351 or the driving assembly 32, and the second position sensor 36 is used to detect the position of the driving assembly 32. In one example, the second position sensor 36 may be a linear displacement sensor. In another example, the second position sensor 36 includes a proximity switch and a trigger plate. One of the proximity switch and the trigger plate is installed and fixed on the bracket 351, and the other is installed on the base 321. The second position sensor 36 can accurately detect the position of the drive assembly 32, so that the position of the pole piece clamping assembly 31 can be further accurately controlled in the width direction to improve the overall correction accuracy of the pole piece feeding device 3, which is beneficial Improve the alignment accuracy of the winding section 50 and the diaphragm.

Referring to FIG. 4, the pole piece winding device 1 further includes a pole piece guide assembly 5. The pole piece guide assembly 5 is arranged upstream of the pole piece clamping assembly 31 and downstream of the feeding assembly 7. The pole piece guide assembly 5 is used to guide the roll-in section 50 to smoothly enter the pole piece clamping assembly 31, thereby reducing the position of the roll-in section 50 output from the feeding assembly 7 from shifting and failing to enter the pole piece clamping assembly 31 smoothly. The roll-in section 50 may have the possibility of folding or wrinkling at the entrance of the pole piece clamping assembly 31. The pole piece guide assembly 5 includes a material gap 51. Along the direction away from the pole piece clamping assembly 31 to close to the pole piece clamping assembly 31, the material passing gap 51 is gradually reduced, so that the material passing gap 51 is roughly inverted cone shape, which reduces the difficulty for the winding section 50 to enter the pole piece guiding assembly 5 , And improve the accuracy of the winding section 50 entering the pole piece clamping assembly 31. In one example, the pole piece guide assembly 5 includes two plates. The two plates are intersected and form a gap 51 between them.

Referring to FIG. 4, the pole piece winding device 1 further includes a winding guide assembly 6. The winding guide assembly 6 is arranged downstream of the pole piece clamping assembly 31 and upstream of the winding needle 41. The winding guide assembly 6 includes a fixing frame 61 and a guide 62 detachably connected to the fixing frame 61. The guide 62 is used to support and guide the roll-in section 50. The guide 62 can guide the winding section 50 to a feeding path tangent to the winding needle 41, so as to facilitate the winding section 50 to be wound along the tangent line of the winding needle 41, and the guide 62 can also provide the winding section 50 The supporting force further reduces the possibility that the winding section 50 sags before being rolled, and also further reduces the possibility that the winding section 50 is folded, bent, or bulged when entering the winding needle 41. The winding guide assembly 6 is used to support and guide the winding section 50 of the cathode sheet 40. In an example, referring to FIG. 5, the winding guide assembly 6 can also be used to support and guide the winding section 50 of the anode sheet 30. The guide 62 has a supporting guide surface 621. The supporting guide surface 621 includes a first arc-shaped concession section 621a, a middle straight section 621b, and a second arc-shaped concession section 621c that are successively distributed along the conveying direction of the pole piece. The middle straight section 621b of the guide 62 is used to support the winding section 50, and the first arc-shaped relief section 621a is used to make way for the winding section 50 when the winding section 50 enters the guide 62, and lower the winding section There is a possibility of premature contact between the end of 50 and the guide 62, which may be bent. The second arc-shaped relief section 621c is used to make way for the winding section 50 when the winding section 50 leaves the guide 62, so as to reduce the possibility that the end of the winding section 50 contacts the guide 62 and is scratched by the guide 62.

In one embodiment, the fixing frame 61 includes a bracket and a telescopic mechanism connected to the bracket. The telescopic mechanism drives the guide 62 to move through the telescopic movement to change the spatial position. The guide 62 can be swingably connected to the telescopic mechanism, so that the angle of the supporting guide surface 621 of the guide 62 can be flexibly adjusted.

Referring to Figures 1, 4 and 7, the feeding assembly 7 of the pole piece unwinding device 2 includes a pole piece clamping unit 71 and a fourth power source (not shown in the figure). The pole piece clamping unit 71 is used for clamping the pole piece output by the pole piece unwinding device 2 at the tape connection position. The fourth power source can drive the pole piece clamping unit 71 to move back and forth between the tape receiving position and the material receiving position. After the pole piece clamping unit 71 clamps the pole piece at the strap connection position, the fourth power source drives the pole piece clamping unit 71 to move to the material receiving position, and then after the pole piece clamping assembly 31 clamps the pole piece, the pole piece clamp The holding unit 71 releases the pole piece and returns to the strap receiving position driven by the fourth power source. After the winding needle 41 winds the pole piece of a predetermined length, the pole piece clamping unit 71 in the tape connection position clamps the pole piece, and then the pole piece cutting assembly 8 cuts the pole piece. In one example, the pole piece clamping unit 71 includes a clamping roller group 711 and a pole piece supporting assembly 712 arranged downstream of the clamping roller group 711. The nip roller group 711 includes a first pinch roller 711a and a second pinch roller 711b. The first pinch roller 711a and the second pinch roller 711b are close to or away from each other to clamp or release the pole piece. The pole piece support assembly 712 includes a first support plate 712a and a second support plate 712b. The pole piece can pass between the first support plate 712a and the second support plate 712b to be supported by the pole piece support assembly 712, ensuring that the pole piece conveyed to the pole piece clamping assembly 31 reduces the free hanging section.

The pole piece cutting assembly 8 of the pole piece unwinding device 2 is arranged on the moving path of the feeding assembly 7 from the tape receiving position to the material receiving position. When the feeding assembly 7 conveys the pole pieces to the pole piece clamping assembly 31, the feeding assembly 7 at least partially passes over the cutting assembly. When the feeding assembly 7 is in the tape connection position, the entire feeding assembly 7 is located above the pole piece cutting assembly 8. Optionally, the pole piece cutting assembly 8 includes a knife seat 81 and a cutter 82 that are arranged oppositely.

Referring to FIG. 1, the pole piece winding device 1 further includes a diaphragm guide assembly 9 for guiding the outer diaphragm 20 into the winding needle 41. In the initial stage of the winding needle 41 pre-winding the diaphragm, the two half shafts 41a of the winding needle 41 or one of the half shafts 41a move and open in the horizontal direction to form a vertical center gap. The diaphragm guide assembly 9 guides the outer diaphragm 20 to above the central gap. The ends of the inner diaphragm 10 and the outer diaphragm 20 are aligned with the center gap in the axial direction of the winding needle 41. Then the two half shafts 41 a of the winding needle 41 move from the rear side to the front side along the axial direction of the winding needle 41 so that the ends of the outer diaphragm 20 and the inner diaphragm 10 move into the center gap of the winding needle 41. The two half shafts 41a of the winding needle 41 are closed to clamp the ends of the outer diaphragm 20 and the inner diaphragm 10. Then, the diaphragm guide assembly 9 guides the outer diaphragm 20 to a position vertically tangent to the winding needle 41 so that the outer diaphragm 20 enters the winding needle 41 along the tangent line of the winding needle 41. The winding needle 41 is started, and after the outer diaphragm 20 and the inner diaphragm 10 are pre-rolled to a predetermined number of layers, the cathode sheet 40 and the anode sheet 30 are transported to the winding needle 41 by the electrode sheet feeding device 3. The diaphragm and the pole piece are jointly wound by the winding needle 41 to form a battery cell. In one example, the diaphragm guide assembly 9 includes a guide roller 91 and a telescopic rod 92. The guide roller 91 is rotatably connected to the end of the telescopic rod 92. The telescopic rod 92 can drive the guide roller 91 to move above the winding needle 41 through a telescopic movement. The outer diaphragm 20 is conveyed by the guide roller 91 and the end of the outer diaphragm 20 is aligned with the center gap of the winding needle 41. After the two half shafts 41 a clamp the ends of the diaphragm, the telescopic rod 92 drives the guide roller 91 to return to the initial position, in which the outer circumference of the guide roller 91 and the outer circumference of the winding needle 41 are tangent.

In order to better understand the technical solution, the working process of the pole piece winding device 4 of an embodiment of the present application will be described below in conjunction with FIG. 1, FIG. 6, FIG. 7 and FIG. 8, but this embodiment does not limit the present invention. The scope of protection requested:

As shown in Fig. 1, the pole piece feeding device 3 is in the receiving position. The feeding assembly 7 clamps the pole piece and sends the initial section of the pole piece into the pole piece clamping assembly 31 at the material receiving position. Any winding needle 41 on the turntable 42 is in the winding position. The winding needle 41 has pre-rolled the inner diaphragm 10 and the outer diaphragm 20 in a predetermined number of layers.

As shown in FIG. 6, the driving assembly 32 drives the pole piece clamping assembly 31 to move from the receiving position to the feeding position. During the movement of the pole piece clamping assembly 31, the initial section maintains a tensioned state rather than a freely suspended state. After the feeding assembly 7 has released the pole pieces, it has returned from the receiving position to the tape receiving position. At this time, the clamping roller group 711 of the feeding assembly 7 is in an open state. The pole piece clamping assembly 31 has directly sent the initial section into the winding needle 41, and the linear speed of the driving roller 312 is consistent with the linear speed of the winding needle 41. After the winding needle 41 winds the outer diaphragm 20, the anode sheet 30, the inner diaphragm 10 and the cathode sheet 40 for a predetermined length, the pole piece clamping assembly 31 releases the pole piece, and is driven by the driving assembly 32 to retract from the feeding position to the receiving position.

As shown in FIG. 7, after the pole piece clamping assembly 31 is retracted to the material receiving position, the winding needle 41 continues to wind the diaphragm and the pole piece. After the winding needle 41 is wound by a predetermined length, the winding is stopped. Both the feeding assembly 7 and the pole piece clamping assembly 31 clamp the pole pieces. Use the pole piece cutting assembly 8 to cut the pole pieces, and make the pole piece form a finishing section on the side of the pole piece cutting assembly 8 close to the pole piece clamping assembly 31, and form a waiting section on the side far from the pole piece clamping assembly 31 The beginning of a winding process. The winding needle 41 is activated, and the driving assembly 32 drives the pole piece clamping assembly 31 of the clamping and closing section to move from the receiving position to the feeding position.

As shown in FIG. 8, the driving assembly 32 drives the pole piece clamping assembly 31 to clamp and move the finishing section to the feeding position. When the pole piece clamping assembly 31 moves to the feeding position, the driving roller 312 rotates and its linear velocity is consistent with the linear velocity of the winding needle 41. Finally, the pole piece clamping assembly 31 directly feeds the finishing section into the winding needle 41 to be wound, completing the winding and finishing processes once. During the movement of the pole piece clamping assembly 31, the finishing section remains in a tensioned state instead of being freely suspended. After that, the turntable 42 rotates, and the next winding needle 41 enters the winding position, and the above actions are repeated in a loop.

Referring to FIG. 1, the pole piece winding device 1 includes two pole piece feeding devices 3, which are used to transport the cathode piece 40 and the anode piece 30 respectively. In other embodiments, the number of pole piece feeding devices 3 may be one or more than three, which can be flexibly selected according to product production requirements.

The pole piece winding device 1 of the embodiment of the present application applies a controllable tension force to the winding section 50 of the pole piece to be input into the winding needle 41 through the pole piece feeding device 3, so as to ensure the winding section 50 of the pole piece itself It is basically not in a freely suspended state, which effectively reduces the possibility of problems such as displacement, bending and discounting when the initial section or the final section enters the winding needle 41, and improves the winding quality of the battery.

The embodiment of the present application also provides a pole piece winding method, including:

Drive the material roll to output pole piece at the receiving position;

The pole piece clamping assembly 31 of the pole piece feeding device 3 clamps the winding section 50 of the pole piece at the receiving position, and the driving assembly 32 of the pole piece feeding device 3 drives the pole piece holding assembly 31 at the receiving position and feeding Position reciprocating

The winding needle of the pole piece winding device 3 winds the pole pieces; at the feeding position, the pole piece feeding device 3 directly conveys the winding section to the winding needle 41.

According to the pole piece winding method of the embodiment of the present application, the pole piece clamping assembly 31 of the pole piece feeding device 3 clamps the winding section 50 of the pole piece and directly conveys the winding section 50 under the driving of the driving assembly 32 To reel needle 41. In this way, when the take-in section 50 enters the winding needle 41, the pole piece feeding device 3 can provide a controllable tension force for the take-in section 50, and reduce the in-winding section 50 caused by the free hanging state of the take-in section 50. When entering the winding needle 41, it is prone to problems such as displacement, bending and discounting, which improves the winding quality of the battery.

Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and equivalents can be used to replace components therein without departing from the scope of the present application, especially as long as there is no structural conflict All the technical features mentioned in each embodiment can be combined in any way. This application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims (15)

1. A pole piece winding equipment, including:

   The pole piece unwinding device is used to drive the material roll to the material receiving position and output the pole piece;

   The pole piece feeding device is arranged downstream of the pole piece unwinding device. The pole piece feeding device includes a pole piece clamping assembly and a driving assembly, and the pole piece clamping assembly is connected with the driving assembly, The pole piece feeding device can clamp the roll-in section of the pole piece at the receiving position through the pole piece clamping assembly, and the pole piece feeding device drives the pole piece through the drive assembly The clamping assembly moves back and forth between the receiving position and the feeding position;

   The pole piece winding device is arranged downstream of the pole piece feeding device, the pole piece winding device includes a winding needle for winding the pole piece; at the feeding position, the pole piece feeding device can The winding section is directly conveyed to the winding needle.
2. The pole piece winding device according to claim 1, wherein:

   The pole piece clamping assembly includes a first roller frame, a driving roller, a first power source, a second roller frame, a driven roller, and a second power source. The second roller frame is movably connected to the first A roller frame, one of the driven roller and the driving roller is arranged on the second roller frame, the other is arranged on the first roller frame, and the driven roller is arranged parallel to the driving roller The first power source is connected to the driving roller, and the second power source drives one of the driven roller and the driving roller to approach or move away from the other by driving the second roller frame The driver moves to clamp or release the winding section, and the drive assembly is connected with the first roller frame.
3. The pole piece winding device according to claim 2, wherein:

   The pole piece sheet feeding device further includes a first guide rail, the first guide rail extends in a direction in which the driven roller approaches or away from the driving roller, and the second roller frame is linearly movable through the first guide rail Connected to the first roller frame, and the second power source drives the second roller frame to move linearly along the first guide rail; or,

   The second power source includes a swing cylinder, the second roller frame is connected with the swing cylinder, and the second roller frame is driven to swing by the swing cylinder.
4. The pole piece winding device according to claim 2 or 3, wherein the first roller frame has two cantilever beams spaced apart along the axial direction of the active roller and a connecting rod connecting the two cantilever beams The second power source is connected to the first roller frame and is located in the space enclosed by the connecting rod and the cantilever beam, and the second roller frame is movably connected to the connecting rod.
5. The pole piece winding device according to any one of claims 2 to 4, wherein:

   The driven roller has two opposite ends in the axial direction of the driven roller and a middle section arranged between the two ends, and the axial dimension of the driving roller is smaller than that of the driven roller, The intermediate section of the driving roller and the driven roller are arranged corresponding to the radial direction of the driving roller; or,

   The driving roller has two ends opposed in the axial direction of the driving roller and a middle section arranged between the two ends. The axial dimension of the driven roller is smaller than the axial dimension of the driving roller, so The intermediate section of the driven roller and the driving roller is arranged corresponding to the radial direction of the driving roller.
6. The pole piece winding device according to any one of claims 2 to 5, wherein the pole piece feeding device further comprises a correction component, and the correction component comprises a bracket, a third guide rail and a third power source, so The third guide rail and the third power source are arranged on the bracket, the third guide rail extends along the axial direction of the driving roller, the drive assembly is movably arranged on the third guide rail, and the first Three power sources drive the drive assembly to move along the third guide rail.
7. The pole piece winding device according to claim 6, wherein the pole piece feeding device further comprises a second position sensor, the second position sensor is arranged on the bracket or the drive assembly, and the second The position sensor is used to detect the position of the drive assembly.
8. The pole piece winding device according to any one of claims 1 to 7, wherein:

   The driving assembly includes a second guide rail and a driving component, the pole piece clamping assembly is linearly movably connected to the second guide rail, and the output end of the driving component is connected to the pole piece clamping assembly to drive The pole piece clamping assembly moves along the second guide rail, so that the pole piece clamping assembly reciprocates between the receiving position and the feeding position; or,

   The driving assembly includes a telescopic component and a driving component, the telescopic component is connected with the pole piece clamping assembly, and the driving component drives the telescopic component to move, so that the pole piece clamping assembly is in the The receiving position and the feeding position reciprocate; or,

   The drive assembly includes a lead screw and a drive part, the lead screw is threadedly connected with the pole piece clamping assembly, and the drive part drives the lead screw to rotate so that the pole piece clamping assembly is connected to the pole piece clamping assembly. The material level and the feed level reciprocate.
9. 8. The pole piece winding device according to claim 8, wherein the pole piece feeding device further comprises a first position sensor, and the first position sensor is arranged on the drive assembly or the pole piece clamping assembly, The first position sensor is used to detect the position of the pole piece clamping assembly.
10. The pole piece winding device according to any one of claims 1 to 9, wherein the pole piece winding device further comprises a pole piece guide assembly, and the pole piece guide assembly is disposed on the pole piece clamping assembly. Upstream, the pole piece guide assembly is used to guide the roll-in section into the pole piece clamping assembly, and the pole piece guide assembly includes a material gap, which is far away from the pole piece clamping assembly to close to the pole piece In the direction of the sheet clamping assembly, the feed gap is gradually reduced.
11. The pole piece winding device according to any one of claims 1 to 10, wherein the pole piece winding device further comprises a roll-in guide assembly, the roll-in guide assembly is arranged on the pole piece clamping assembly Downstream, the winding guide assembly includes a fixing frame and a guide detachably connected to the fixing frame, and the guide is used to support and guide the winding section.
12. The pole piece winding device according to any one of claims 1 to 11, wherein the pole piece unwinding device further comprises a feeding assembly, the feeding assembly is arranged upstream of the pole piece feeding device, and The feeding assembly includes a pole piece clamping unit and a fourth power source. The pole piece clamping unit is used to clamp the pole piece at the tape connection position. The fourth power source drives the pole piece clamping unit to be in place. The belt connecting position and the material receiving position move back and forth.
13. The pole piece winding device according to claim 12, wherein the pole piece clamping unit comprises a clamping roller group and a pole piece support assembly arranged downstream of the clamping roller group, the clamping roller group comprising A first clamping roller and a second clamping roller, the first clamping roller and the second clamping roller are close to or far away from each other to clamp or release the pole piece, the pole piece supporting assembly includes a first A supporting plate and a second supporting plate, the pole piece can pass between the first supporting plate and the second supporting plate.
14. The pole piece winding device according to claim 12 or 13, wherein the pole piece unwinding device further comprises a pole piece cutting assembly, and the pole piece cutting assembly is arranged on the feeding assembly to move from the tape receiving position On the path to the material receiving position, the pole piece cutting assembly is used to cut the pole piece, and the pole piece cutting assembly includes a knife seat and a cutter that are arranged oppositely.
15. A pole piece winding method, including:

    Drive the material roll to output pole piece at the receiving position;

    The pole piece clamping assembly of the pole piece feeding device clamps the roll-in section of the pole piece at the receiving position, and the driving assembly of the pole piece feeding device drives the pole piece clamping assembly in the receiving position. The material level and the feeding level move back and forth;

    The winding needle of the pole piece winding device winds the pole piece; at the feeding position, the pole piece feeding device directly conveys the winding section to the winding needle.

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