WO2021146932A1

WO2021146932A1 - Lithium battery winding apparatus

Info

Publication number: WO2021146932A1
Application number: PCT/CN2020/073562
Authority: WO
Inventors: 汤辉; 汤志为; 杨凯; 郑付成; 黄东海; 戴保建; 周树清; 朱纬亚; 高云峰
Original assignee: 大族激光科技产业集团股份有限公司
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2021-07-29
Also published as: CN215118983U

Abstract

A lithium battery winding apparatus, comprising a rotating disc (10) rotating around a main shaft, a first winding needle (21) and a second winding needle (22) for clamping and winding a battery core membrane (1), an upper membrane guide mechanism (30) and a lower membrane guide mechanism (40) used for guiding the battery core membrane (1), and a membrane cutting mechanism (50) used for cutting the battery core membrane (1), the lower membrane guide mechanism (40) being arranged on the rotating disc (10) and rotating with the rotating disc (10); the first winding needle (21) and the second winding needle (22) are both rotatably arranged on the rotating disc (10) by means of a support shaft, and are symmetrical relative to the centre of the main shaft; after being guided by the upper membrane guide mechanism (30) and the lower membrane guide mechanism (40), a section of the battery core membrane (1) positioned between the upper membrane guide mechanism (30) and the lower membrane guide mechanism (40) passes through the support shaft of the first winding needle (21) or the second winding needle (22), the main shaft and the support shafts being parallel to one another. When in operation, there is no need to first correct the position of the battery core membrane (1), reducing the work processes and increasing processing efficiency.

Description

Lithium battery winding device

Technical field

The utility model relates to the technical field of lithium battery processing, in particular to a lithium battery winding device.

Background technique

The inside of the lithium battery adopts a spiral wound structure, and a very fine and highly permeable polyethylene film separator is used to separate the positive and negative electrodes. The positive electrode includes a current collector composed of lithium cobalt oxide and aluminum foil, and the negative electrode is composed of a current collector composed of graphitized carbon material and copper foil.

When processing lithium batteries, it is necessary to wind the cell membrane composed of the positive electrode, the negative electrode and the separator through a winding needle. As shown in Figure 1, in the existing lithium battery winding device, the two winding needles a are symmetrically arranged on the turntable b through a plane (such as a horizontal plane), which will cause the upper guide wheel c and the lower guide wheel f to be different. The cell membrane 1 between is inclined.

As shown in Figure 2, when the cutter d cuts the battery cell membrane 1, it is necessary to first extend through the correction wheel e to resist the cell film 1, so that the cell film 1 between the correction wheel e and the upper guide wheel c The battery cell membrane 1 can be cut off only after it is in a vertical state.

When the turntable 10 rotates 180°, the cell film 1 between the upper guide wheel c and the lower guide wheel f is inclined again, and the winding needle cannot be directly clamped. It is also necessary to first extend and support the cell membrane 1 through the correction wheel e, so that the cell membrane 1 between the correction wheel e and the upper guide wheel c is in a vertical state and is located at the opening of the winding needle a, so that the winding needle a Only then can the cell membrane 1 be stretched out and clamped, and then wound.

Compared with the winding method of one winding needle, the above-mentioned winding device uses two winding needles to wind, although the winding efficiency can be improved to a certain extent. However, the winding process of the aforementioned winding device is still relatively large, and its processing efficiency needs to be further improved.

technical problem

The technical problem to be solved by the utility model is to provide a lithium battery winding device with higher processing efficiency.

Technical solutions

The technical solution adopted by the utility model to solve its technical problems is to provide a lithium battery winding device, which includes a turntable rotating around a main shaft, a first winding needle and a second winding needle for clamping and winding the battery cell membrane , Using an upper film guiding mechanism and a lower film guiding mechanism for guiding the cell film and a film cutting mechanism for cutting the cell film, the lower film guiding mechanism is arranged on the turntable and rotates with the turntable;

The first winding needle and the second winding needle are both rotatably arranged on the turntable through a fulcrum, and are symmetrical with respect to the center of the main shaft; the electric core guided by the upper film guiding mechanism and the lower film guiding mechanism A film, a section of which is located between the upper film guide mechanism and the lower film guide mechanism passes through the supporting shaft of the first winding needle or the second winding needle; wherein the main shaft and the supporting shaft are parallel to each other.

Further, the lower film guiding mechanism includes two lower film guiding parts, and the two lower film guiding parts are both arranged on the turntable and symmetrical with respect to the center of the main shaft.

Further, the two lower film guide portions are rotatably arranged on the turntable.

Further, the upper film guiding mechanism includes an upper film guiding part, and an outer tangent line of the upper film guiding part and the lower film guiding part passes through the supporting shaft.

Further, the two lower film guiding parts and the lower film guiding part are both passing rollers.

Further, the lower film guiding mechanism includes four lower film guiding parts, and the four lower film guiding parts are all arranged on the turntable.

Further, the film cutting mechanism includes a film cutting power part, a cutter head, and a pressure wheel, the pressure wheel is in transmission connection with the film cutting power part, and the film cutting power part drives the pressure wheel to extend out of the pressure wheel. The lower film guiding parts abut against each other to compress the cell film; the cutter head is in transmission connection with the film cutting power part, and the film cutting power part drives the cutter head to extend and cut the upper film guiding part and The section between the lower guiding membranes.

Further, the lower film guide mechanism further includes two top blocks that cooperate with the cutter head, and the two top blocks are both arranged on the turntable and are symmetrical with respect to the center of the spindle; The lower film guide parts are respectively arranged on the two top blocks.

Further, the cutter head is a hot cutter head.

Further, the lithium battery winding device further includes a first power unit, a second power, and a third power. The first winding needle is in transmission connection with the first power unit, and the first power unit can drive the The first winding needle rotates around a supporting shaft, and can drive the first winding needle to rise and fall along the supporting shaft; the second winding needle is in transmission connection with the second power part, and the second power part can drive the The second winding needle rotates around the supporting shaft and can drive the second winding needle to rise and fall along the supporting shaft; the turntable is in transmission connection with the third power part, and the third power part can drive the turntable to rotate around the main shaft , The first winding needle and the second winding needle revolve around the main shaft.

Compared with the prior art, the utility model provides a lithium battery winding device. When working, the second winding needle first winds the battery cell film. After the second winding needle is finished, it is located between the upper and lower film guide mechanism. A section of the electric core film between the film guiding mechanisms passes through the fulcrum of the first winding needle. Therefore, the first winding needle can directly clamp the cell membrane without first correcting the position of the cell membrane, reducing one process and improving processing efficiency.

In addition, while the first winding needle clamps the battery cell film, the film cutting mechanism can cut the battery cell film, and these two processes can be carried out at the same time, which further improves the processing efficiency.

Beneficial effect

After the first winding needle has clamped the cell membrane, the turntable rotates 180°. Since the first winding needle and the second winding needle are symmetrical with respect to the center of the main shaft, they are located in the section between the upper and lower membrane guiding mechanisms. The cell membrane also passes through the fulcrum of the second winding needle. Therefore, the second winding needle can directly clamp the battery cell membrane without first correcting the position of the battery cell membrane. One more process is reduced and the processing efficiency is improved again.

Description of the drawings

In the following, the utility model will be further described in conjunction with the accompanying drawings and embodiments. In the accompanying drawings:

FIG. 1 is a schematic structural diagram of a lithium battery winding device provided in the prior art;

Fig. 2 is a schematic diagram of the lithium battery winding device in Fig. 1 in a state of correction and film cutting;

3 is a schematic diagram of the structure of the lithium battery winding device provided by the present invention;

FIG. 4 is a schematic diagram of the state of the turntable in FIG. 3 after being rotated by 180°;

5 is a schematic diagram of the film cutting state of the lithium battery winding device in FIG. 3;

6 is a schematic diagram of another implementation structure of the lithium battery winding device provided by the present invention;

FIG. 7 is a schematic diagram of another implementation structure of the lithium battery winding device provided by the present invention.

The best mode of the present invention

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in Figure 3, the present invention provides a lithium battery winding device, which includes a turntable 10 that rotates around a main shaft, a first winding needle 21 and a second winding needle 22 for clamping and winding the battery cell film 1, The upper film guide mechanism 30 and the lower film guide mechanism 40 for guiding the cell film 1 and the film cutting mechanism 50 for cutting the cell film 1 are used. The lower film guide mechanism 40 is arranged on the turntable 10 and rotates with the turntable 10. The upper film guiding mechanism 30 and the film cutting mechanism 50 are not provided on the turntable 10 and do not rotate synchronously with the turntable 10.

The first winding needle 21 and the second winding needle 22 are both rotatably arranged on the turntable 10 via a support shaft, and are symmetrical with respect to the center of the main shaft. The cell film 1 guided by the upper film guide mechanism 30 and the lower film guide mechanism 40, the section between the upper film guide mechanism 30 and the lower film guide mechanism 40 passes through the first winding needle 21 or the second winding needle 22 The fulcrum; among them, the main shaft and the fulcrum are parallel to each other.

It is worth noting that both the main shaft and the supporting shaft in this article are geometric virtual shafts. The diameter of the virtual shaft can be defined as the width of the winding needle opening, which is set for the convenience of describing the working principle. If the cell membrane 1 passes through the rotation center of the winding needle, that is, the fulcrum, then the rotation angle of the winding needle can be adjusted to clamp the cell membrane 1.

Hereinafter, a specific embodiment will be described. That is, a section of the cell film 1 between the upper film guide mechanism 30 and the lower film guide mechanism 40 is in a vertical state, and the opening of the first winding needle 21 is also vertical.

Referring to Figure 3, when working, the second winding needle 22 first winds the cell film 1. When the second winding needle 22 is finished, because a section of cell film is located between the upper film guide mechanism 30 and the lower film guide mechanism 40 1 Pass through the fulcrum of the first winding needle 21. Therefore, the first winding needle 21 can directly clamp the battery cell membrane 1 without first correcting the position of the battery cell membrane 1, which reduces one process and improves the processing efficiency.

In addition, while the first winding needle 21 clamps the cell membrane 1, the film cutting mechanism 50 can cut the cell membrane 1, and these two processes can be performed at the same time to further improve the processing efficiency.

As shown in FIG. 4, after the first winding needle 21 has clamped the battery cell membrane 1, the turntable 10 rotates 180°. Since the first winding needle 21 and the second winding needle 22 are symmetrical with respect to the center of the main shaft, a section of the cell membrane 1 located between the upper film guide mechanism 30 and the lower film guide mechanism 40 also passes through the support of the second winding needle 22. axis. Therefore, the second winding needle 22 can directly clamp the battery cell film 1 without first correcting the position of the battery cell film 1, and one more process is reduced, which again improves the processing efficiency.

In summary, the lithium battery winding device of the present application can greatly reduce the number of processes through a reasonable layout, and can at least increase the winding efficiency by more than twice, which brings the lithium battery processing to a new level and has a broad application prospect.

As shown in FIG. 5, the lower film guide mechanism 40 includes two lower film guide parts 41, and the two lower film guide parts 41 are both arranged on the turntable 10 and are symmetrical with respect to the center of the main shaft. After the turntable 10 is rotated by 180°, the two lower film guide portions 41 exchange positions to ensure that the state of the battery cell film 1 remains unchanged.

Specifically, the two lower film guide portions 41 can be rotatably arranged on the turntable 10 or fixed on the turntable 10. In this embodiment, the two lower film guide portions 41 are both passing rollers. The passing roller is rotatably arranged on the turntable 10 to make the cell membrane 1 move more smoothly. Of course, the number of the lower guide film portions 41 can also be more than two, such as four, eight, etc., which is more practically necessary to be set.

In other embodiments, the cell membrane 1 may not be vertical. Theoretically, the included angle between the battery cell membrane 1 and the horizontal direction is between 0° and 180°. As shown in Fig. 6, the included angle between the battery cell membrane 1 and the horizontal direction is 78°. At this time, the number of the lower film guide portion 41 is four. As shown in Fig. 7, the included angle between the battery cell membrane 1 and the horizontal direction is 103°. The number of the lower film guide portion 41 is four. The specific angle should be calculated based on the diameter of the winding needle and the length of the cell.

Referring to FIG. 5, the upper film guiding mechanism 30 includes an upper film guiding portion 31, and the outer tangent line of the upper film guiding portion 31 and the lower film guiding portion 41 passes through the fulcrum. In this way, a section of the cell film 1 guided by the upper film guide portion 31 and the lower film guide portion 41 passes through the fulcrum of the first winding needle 21. In this embodiment, the lower film guide 41 is also an over roller, which can be installed in rotation or in a fixed manner, and can be set according to actual needs.

The film cutting mechanism 50 includes a film cutting power part, a cutter head 51 and a pressing wheel 52, and the pressing wheel 52 is drivingly connected with the film cutting power part. The film cutting power unit drives the pressing wheel 52 to extend and abut the lower film guide 41 to press the cell film 1. The cutter head 51 is in transmission connection with the film cutting power part, and the film cutting power part drives the cutter head 51 to extend and cut a section between the upper film guiding part 31 and the lower film guiding part 41. In this embodiment, the cutter head 51 is a thermal cutter head 51. Specifically, the cutter head 51 cuts the battery cell film 1 between the winding needle and the lower film guide portion 41.

In order to cut the cell membrane 1 more conveniently, the lower membrane guiding mechanism 40 further includes two top blocks 42 that cooperate with the cutter head 51. The two top blocks 42 are both arranged on the turntable 10 and are symmetrical with respect to the center of the spindle. The two lower film guide portions 41 are respectively arranged on the two top blocks 42. It can be installed either by rotating or fixed, and it can be set according to actual needs.

In actual products, the lithium battery winding device has a base, the turntable 10 is rotatably arranged on the base, and the upper film guiding mechanism 30 and the film cutting mechanism 50 can be arranged on the base. The upper film guiding mechanism 30 also includes a bracket, which is mounted on the base, and the upper film guiding portion 31 is rotatably mounted on the bracket.

Specifically, the lithium battery winding device further includes a first power unit, a second power and a third power, and the first winding needle 21 is drivingly connected with the first power unit. The first power unit is arranged on the turntable 10 and can drive the first winding needle 21 to rotate around the supporting shaft, and can drive the first winding needle 21 to move up and down along the supporting shaft. The second winding needle 22 is in transmission connection with the second power part. The second power part is also arranged on the turntable 10 to drive the second winding needle 22 to rotate around the supporting shaft and to drive the second winding needle 22 to rise and fall along the supporting shaft. The turntable 10 is in transmission connection with a third power part. The third power part is arranged on the base and can drive the turntable 10 to rotate around the main shaft. The first winding needle 21 and the second winding needle 22 revolve around the main shaft.

The reason for driving the first winding needle 21 and the second winding needle 22 to move up and down along the supporting shaft is to avoid affecting the movement of the cell membrane 1 and to facilitate clamping of the cell membrane 1 at the same time. For example, when the second winding needle 22 is winding the electric core film 1, the second winding needle 22 is in an extended state, the first winding needle 21 is in a contracted state, and the electric core film 1 is located along the fulcrum of the first winding needle 21. Right above, the opening of the first winding needle 21 is just aligned with the cell membrane 1 (refer to Figure 3).

After the second winding needle 22 is wound, the film cutting power unit drives the pressing wheel 52 to extend and abut the lower film guide 41 to press the battery cell film 1. Then, the cutter head 51 is driven to extend, and with the cooperation of the top block 42, the cell membrane 1 is cut off. After cutting, the blade 51 retracts. The pressing wheel 52 can continue to keep pressing the cell membrane 1 until the second winding needle 22 is completely wound (refer to FIG. 5). After winding, the second winding needle 22 retracts.

Since the opening of the first winding needle 21 is just aligned with the cell membrane 1, the first power part drives the first winding needle 21 to extend along the fulcrum, so that the cell membrane 1 is located in the opening, and then the cell membrane 1 is clamped. Referring to FIG. 4, after the first winding needle 21 is wound, the third power unit drives the turntable 10 to rotate 180°, and then the film cutting mechanism 50 performs cutting. Through the above-mentioned two winding needles cyclic winding, the processing efficiency is greatly improved.

It is worth mentioning that the above-mentioned specific structures of the first winding needle 21, the second winding needle 22, the power unit, etc. are common structures known to those skilled in the art, and the specific structures are not described here.

It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model, not to limit them. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technologies can be modified. The features are equivalently replaced; and all these modifications and replacements should belong to the protection scope of the appended claims of the present utility model.

Claims

A lithium battery winding device, comprising a turntable that rotates around a main shaft, a first winding needle and a second winding needle for clamping and winding a battery cell film, an upper film guide mechanism and a lower film guide for guiding the battery film Mechanism and a film cutting mechanism for cutting the cell film, the lower film guiding mechanism is arranged on the turntable and rotates with the turntable, characterized in that;

The first winding needle and the second winding needle are both rotatably arranged on the turntable through a fulcrum and are symmetrical with respect to the center of the main shaft; the electric core guided by the upper and lower film guiding mechanisms A film, a section of which is located between the upper film guide mechanism and the lower film guide mechanism passes through the supporting shaft of the first winding needle or the second winding needle; wherein the main shaft and the supporting shaft are parallel to each other.
The lithium battery winding device according to claim 1, wherein the lower film guide mechanism comprises two lower film guide parts, and the two lower film guide parts are both arranged on the turntable and opposite to The main shaft is symmetrical in the center.
The lithium battery winding device according to claim 2, wherein the two lower film guide portions are rotatably arranged on the turntable.
The lithium battery winding device according to claim 2, wherein the upper film guide mechanism comprises an upper film guide part, and an outer tangent line of the upper film guide part and the lower film guide part passes through the branch axis.
The lithium battery winding device according to claim 4, wherein the two lower film guide portions and the lower film guide portion are both over rolls.
The lithium battery winding device according to claim 1, wherein the lower film guide mechanism comprises four lower film guide parts, and the four lower film guide parts are all arranged on the turntable.
The lithium battery winding device according to claim 4, wherein the film cutting mechanism comprises a film cutting power unit, a cutter head, and a pressing wheel, and the pressing wheel is in transmission connection with the film cutting power unit, and The film cutting power part drives the pressing wheel to extend and abut the lower film guide part to press the cell membrane; the cutter head is in transmission connection with the film cutting power part, and the film cutting power part drives the The cutter head protrudes and cuts a section between the upper film guide part and the lower film guide part.
The lithium battery winding device according to claim 7, wherein the lower film guide mechanism further comprises two top blocks matched with the cutter head, and the two top blocks are both arranged on the turntable , And symmetrical with respect to the center of the main shaft; the two lower guiding film portions are respectively arranged on the two top blocks.
The lithium battery winding device according to claim 7, wherein the cutter head is a thermal cutter head.
The lithium battery winding device according to any one of claims 1 to 9, wherein the lithium battery winding device further comprises a first power unit, a second power, and a third power, and the first roll The needle is in transmission connection with the first power part, and the first power part can drive the first winding needle to rotate around a supporting shaft, and can drive the first winding needle to rise and fall along the supporting shaft; the second winding needle In transmission connection with the second power part, the second power part can drive the second winding needle to rotate around a supporting shaft, and can drive the second winding needle to rise and fall along the supporting shaft; the turntable and the first The three power parts are in transmission connection, and the third power part can drive the turntable to rotate around the main shaft, and the first and second winding needles revolve around the main shaft.