WO2021146928A1

WO2021146928A1 - Membrane-winding apparatus

Info

Publication number: WO2021146928A1
Application number: PCT/CN2020/073547
Authority: WO
Inventors: 汤辉; 汤志为; 杨凯; 郑付成; 黄东海; 琚云东; 朱纬亚; 张卫东; 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: CN215118995U

Abstract

A membrane-winding apparatus, comprising a winding needle seat (10), a left reel (21) and a right reel (22) used for winding a membrane set, a left clip (31) and a right clip (32) for clamping the membrane set; and further comprising a left sliding block (41), a right sliding block (42), an ejector needle (50), and an elastic reset member (60) causing the left sliding block (41) and the right sliding block (42) to generate a trend of approaching each other, the left sliding block (41) and the right sliding block (42) are arranged on the winding needle seat (10) so as to slide relative to one another, the ejector needle (50) movably penetrates the winding needle seat (10), and when it is necessary to clamp the membrane set, the ejector needle (50) is inserted between the left sliding block (41) and the right sliding block (42), such that the left clip (31) and the right clip (32) approach each other to clamp the membrane set. Due to such a means where the sliding blocks are pushed to two sides by means of the ejector needle, the left clip and the right clip can tightly clamp the membrane set provided that the ejector needle is not disengaged, the structure is simple, the stability is high, and the yield rate of battery cells is improved; when the winding of a battery cell is completed, the ejector needle is disengaged from between the left sliding block and the right sliding block, the left reel and the right reel approach each other, the overall volume is reduced, the inner circle of the battery cell is disengaged, such that the reels can be pulled out without taking the material with them, thereby greatly lowering the rejection rate of battery cells.

Description

Film rolling device

Technical field

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

Background technique

The core of the lithium battery adopts a spiral wound structure. The aluminum foil, the isolation film, the copper foil and the isolation film are sequentially stacked to form a film group, and then the film group is clamped by the film winding device to be wound into a battery core in a certain order, and finally the battery core is pulled out to complete the winding of the battery core. Each step of the above process affects the capacity and yield of the battery cell. The use of a stable and efficient film roll device is very important, and it has a huge promotion effect on the development of the lithium battery industry.

However, the existing film winding device is mainly driven and clamped by an air cylinder, and the stability is poor, and problems such as failure of the winding due to the insufficient clamping of the film set, and the scrap of the battery due to the stripping of the material when the winding needle is withdrawn often occur. Therefore, further improvements are needed.

technical problem

The technical problem to be solved by the utility model is to provide a film winding device, which aims to solve the problems that the existing film winding device is prone to winding failure due to the insufficient clamping of the film set, and the battery core is scrapped when the winding needle is withdrawn.

Technical solutions

The technical solution adopted by the utility model to solve its technical problems is to provide a film winding device, which includes a winding needle seat, a left reel and a right reel used for winding the film group, a left clamp for clamping the film group, and The right clip; also includes a left slider, a right slider, a thimble, and an elastic reset member that makes the left slider and the right slider have a relatively close trend, and the left slider and the right slider are relatively slidably arranged in the On the winding needle seat, the thimble is movably threaded on the winding needle seat;

The thimble is inserted between the left sliding block and the right sliding block, pushing the left sliding block and the right sliding block to be relatively far away, making the left clip and the right clip relatively close, and making the left reel and the right reel Relatively far away

The thimble is separated from between the left slider and the right slider, the elastic reset member pushes the left slider and the right slider to be relatively close, so that the left clip and the right clip are relatively far away, so that the left scroll The drum and the right drum are relatively close.

Further, the left clamp is arranged on the needle reel seat, and the right clamp is arranged on the left slider; when the left slider and the right slider are relatively far away, the left clamp and the right clamp Relatively close.

Further, the left reel is arranged on the winding needle seat, and the right reel is arranged on the right slider; when the left and right sliders are relatively far away, the left reel Relatively far away from the right reel.

Further, the film winding device further includes a left winding needle and a right winding needle, the left winding needle is arranged on the winding needle seat, and the left clamp and the left winding drum are both arranged on the left winding needle; The right winding needle is arranged on the right slider, and the right winding drum is arranged on the right winding needle.

Further, the right winding needle is provided with an escape groove for accommodating the right clip.

Further, the left clip is installed on the left winding needle through a buffer assembly, the buffer assembly includes a first guide shaft and a buffer spring, and the left clip is connected to the left winding needle through the first guide shaft , The buffer spring is sleeved on the first guide shaft and is located between the left clamp and the left winding needle; when the left clamp is pressed, it can move along the first guide shaft, And compress the buffer spring.

Further, a receiving groove is provided on the winding needle seat, a second guide shaft is provided in the receiving groove, and the left slider and the right slider are both located in the receiving groove and along the second guide The shaft slides.

Further, the needle reel seat includes a base, an upper cover and a fixing plate installed on the base, the receiving groove is opened on the base, the left reel needle is arranged on the upper cover, and the thimble is movable The piercing is set on the fixed plate.

Further, the elastic return piece is a return spring, and there are two; the left and right sliders are both provided with mounting holes for installing the elastic return piece.

Further, the free end of the thimble is provided with a first step surface and a second step surface, the height of the first step surface is lower than the second step surface, and is connected by a transition surface; when the second step surface When located between the left slider and the right slider, the left clamp and the right clamp are relatively close to achieve clamping.

Compared with the prior art, the utility model provides a film rolling device. When the film set needs to be clamped, the thimble is inserted between the left slider and the right slider, so that the left clamp and the right clamp are relatively close to achieve clamping膜组。 Film group. This way of pushing the slider to both sides through the thimble, as long as the thimble does not detach, the left clamp and the right clamp can tightly clamp the film group, the structure is simple, the stability is high, and the yield rate of the battery cell is improved.

Beneficial effect

In addition, when the left clamp and the right clamp clamp the film group tightly, the left reel and the right reel are relatively far away, facilitating the winding of the film group. After the cell winding is completed, the thimble separates from the left and right sliders, drives the left clamp and the right clamp to move away from each other, and loosens the film set. At the same time, the left reel and the right reel are relatively close, reducing the overall volume, and being out of contact with the inner ring of the battery, so that the reel can be drawn out to prevent stripping and greatly reduce the scrap rate of the battery.

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:

Figure 1 is a schematic diagram of the film rolling state of the film rolling device provided by the present invention;

Figure 2 is an exploded schematic view of the film rolling device in Figure 1;

Fig. 3 is another exploded schematic view of the film rolling device in Fig. 1;

Figure 4 is a partial exploded schematic view of the film rolling device in Figure 1;

Fig. 5 is a schematic diagram of the structure of the left slider and the right slider in Fig. 4 installed on the base;

Fig. 6 is a partial enlarged schematic view of the free end of the thimble in Fig. 4.

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 Figures 1 and 2, the present invention provides a film winding device, including a winding needle seat 10, a left reel 21 and a right reel 22 for winding the film set, and a left clamp 31 for clamping the film set. And the right clip 32. It also includes a left slider 41, a right slider 42, a thimble 50, and an elastic reset member 60 that causes the left slider 41 and the right slider 42 to be relatively close to each other. The left slider 41 and the right slider 42 are relatively slidably arranged on the roll On the needle base 10, the thimble 50 is movably threaded on the winding needle base 10. Among them, the film group includes aluminum foil A, isolation film B, copper foil C and isolation film B.

When it is necessary to clamp the film assembly, insert the free end of the thimble 50 between the left slider 41 and the right slider 42, and push the left slider 41 and the right slider 42 to move away from each other, so that the left clip 31 and the right clip 32 are relatively close. , Realize the clamping film group. This way of pushing the slider to both sides through the thimble 50, as long as the thimble 50 does not detach, the left clamp 31 and the right clamp 32 can tightly clamp the film group, the structure is simple, the stability is high, and the quality of the battery is improved. Rate.

In addition, when the left clamp 31 and the right clamp 32 clamp the film group tightly, the left reel 21 and the right reel 22 are relatively far away, which facilitates the winding of the film group. After the battery core is wound, the free end of the thimble 50 separates from the left slider 41 and the right slider 42, and the elastic reset member 60 pushes the left slider 41 and the right slider 42 to be relatively close, so that the left clip 31 and the right clip 32 Relatively far away, loosen the membrane group. At the same time, the left reel 21 and the right reel 22 are relatively close to reduce the overall volume and disengage from the inner ring of the battery. In this way, the reel can be drawn out to prevent stripping and greatly reduce the scrap rate of the battery.

Specifically, the film winding device further includes a left winding needle 71 and a right winding needle 72. The free end of the thimble 50 is inserted between the left slider 41 and the right slider 42 to push the left slider 41 and the right slider 42 to move away from each other. The left winding needle 71 and the right winding needle 72 are relatively far away, thereby making the left winding drum 21 and the right winding drum 22 relatively far away. The free end of the thimble 50 is separated from the left slider 41 and the right slider 42, and the elastic reset member 60 pushes the left slider 41 and the right slider 42 to be relatively close, so that the left winding needle 71 and the right winding needle 72 are relatively close, thereby making The left reel 21 and the right reel 22 are relatively close.

As shown in FIG. 3, the needle reel base 10 includes a base 11, an upper cover 12 and a fixing plate 13 installed on the base 11, and the thimble 50 is movably threaded on the fixing plate 13. Wherein, the sliding direction of the thimble 50 and the sliding direction of the left slider 41 and the right slider 42 are perpendicular to each other.

In this embodiment, the left winding needle 71 is arranged on the winding needle seat 10 and specifically installed on the upper cover 12. The left clamp 31 is arranged on the left winding needle 71 and the right clamp 32 is arranged on the left slider 41. When the left slider 41 and the right slider 42 are relatively far away, the left clip 31 and the right clip 32 are relatively close to achieve clamping of the film assembly.

In order to prevent the film group from slipping off, the side where the left clip 31 and the right clip 32 contact the film group is also provided with ridges to increase friction.

In order to prevent the instantaneous pressure increase from damaging the membrane assembly, the left clamp 31 is installed on the left winding needle 71 through a buffer assembly. In this embodiment, the buffer assembly includes a first guide shaft (not shown) and a buffer spring 81. The left clip 31 is connected to the left winding needle 71 through the first guide shaft, and the buffer spring 81 is sleeved on the first guide shaft. And is located between the left clamp 31 and the left winding needle 71. When the left clip 31 receives pressure, it can move along the first guide shaft and compress the buffer spring 81 to play a buffering role.

1 and 3, the left reel 21 is set on the left reel pin 71, the right reel pin 72 is set on the right slider 42, and the right reel 22 is set on the right reel pin 72. That is, the left winding needle 71 and the left winding drum 21 do not move, and the right winding needle 72 and the right winding drum 22 are driven by the right slider 42 to approach or be far away from the left winding needle 71 and the left winding drum 21.

Since the right clip 32 is arranged on the left slider 41, the right winding needle 72 is arranged on the right slider 42, and the left slider 41 and the right slider 42 are relatively close. Therefore, the right clip 32 and the right winding needle 72 are relatively close. In order to make the structure more compact, a side of the right winding needle 72 close to the right clip 32 is provided with an escape groove 73. When the free end of the thimble 50 leaves between the left slider 41 and the right slider 42, the left slider 41 and the right slider 42 abut against each other, and the right clip 32 is located in the escape groove 73.

In order to facilitate the matching of the winding needle with the winding drum, the inner walls of the left winding drum 21 and the right winding drum 22 are provided with positioning grooves 23 that are matched with the winding needle. The outer walls of the left reel 21 and the right reel 22 are also provided with grooves 24, which have the effect of reducing the contact area and facilitate extraction from the battery core. When the left reel 21 and the right reel 22 are relatively far away, the far away left reel 21 and the right reel 22 form a standard cylinder as a whole, which facilitates the winding of the film set. Among them, the outer walls of the left reel 21 and the right reel 22 are also coated with a special coating, so that the film group will not be lost.

As shown in Figure 4, the base 11 of the reeling needle seat 10 is provided with a receiving groove 14, and a second guide shaft 15 is provided in the receiving groove 14. The left slider 41 and the right slider 42 are both located in the receiving groove 14, and The second guide shaft 15 slides. Wherein, the receiving groove 14 is U-shaped, and its two side walls play a limiting role on the left slider 41 and the right slider 42. Since the aluminum foil, film group, copper foil and film group are relatively thin, the stroke of the left slider 41 and the right slider 42 is relatively small, which can ensure that the film group is inserted between the left clip 31 and the right clip 32. .

In order to make the left slider 41 and the right slider 42 slide more smoothly, a linear bearing 16 can be sleeved on the second guide shaft 15. Then, the left slider 41 and the right slider 42 are respectively sleeved on the linear bearing 16.

In order to make the installation of the right winding needle 72 more stable, a baffle 43 is also provided on the right slider 42. When the right winding needle 72 is set on the right slider 42, the right winding needle 72 and the baffle 43 abut against each other (refer to FIG. 3).

In this embodiment, the elastic return member 60 is a return spring, and there are two. Both the left slider 41 and the right slider 42 are provided with an installation hole 44 for installing the elastic return member 60. One end of the return spring is inserted into the installation hole 44, and the other end abuts against the inner wall of the receiving groove 14. The two return springs push the left slider 41 and the right slider 42 to the middle at the same time from both sides, resulting in a relatively close tendency. In the absence of external force, the left slider 41 and the right slider 42 abut against each other.

As shown in FIG. 5, in order to facilitate the ejector pin 50 to act on the two sliders, bumps 45 are provided on both the left slider 41 and the right slider 42. The bump 45 is used to push the slider to move, which reduces the volume of the slider and saves materials. The sliding block and the convex block are integrally formed, and the sliding direction of the thimble 50 and the second guide shaft 15 are perpendicular to each other.

As shown in FIG. 6, the free end of the thimble 50 is provided with a first step surface 51 and a second step surface 52. The height of the first step surface 51 is lower than the second step surface 52 and is connected by a transition surface 53. This structure not only facilitates the insertion of the thimble 50 between the two protrusions 45, but also facilitates the maintenance of the locked state. Wherein, the transition surface 53 may be an inclined surface or a curved surface, so that a smooth transition between the first step surface 51 and the second step surface 52 is facilitated to facilitate the smooth insertion of the ejector pin 50.

Please refer to Figures 3 and 5 together. When the free end of the thimble 50 is inserted between the two protrusions 45, the first step surface 51 first enters between the two protrusions 45, so that the left clip 31 and the right clip 32 are relatively close a little. Further, the second step surface 52 is located between the left slider 41 and the right slider 42, so that the left clip 31 and the right clip 32 are closer to achieve clamping of the film assembly. Without the action of external force, the second step surface 52 will remain located between the left slider 41 and the right slider 42, and can maintain the locked state. The free end of the thimble 50 separates from the two protrusions 45, the elastic reset member 60 pushes the left slider 41 and the right slider 42 to be relatively close to realize the reset, and the left clamp 31 and the right clamp 32 remain open.

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 film winding device includes a winding needle seat, a left reel and a right reel for winding a film group, a left clamp and a right clamp for clamping the film group, and is characterized in that it also includes a left slider and a right slide Block, thimble, and elastic resetting part that makes the left and right sliders relatively close to each other. The left and right sliders are relatively slidably arranged on the winding needle seat, and the thimble is movably pierced Set on the reel needle seat;

The thimble is inserted between the left sliding block and the right sliding block, pushing the left sliding block and the right sliding block to be relatively far away, making the left clip and the right clip relatively close, and making the left reel and the right reel Relatively far away

The thimble is separated from between the left slider and the right slider, the elastic reset member pushes the left slider and the right slider to be relatively close, so that the left clip and the right clip are relatively far away, so that the left scroll The drum and the right drum are relatively close.
The film rolling device according to claim 1, wherein the left clip is provided on the winding needle seat, and the right clip is provided on the left slider; when the left slider and the right slide When the blocks are relatively far away, the left clamp and the right clamp are relatively close.
The film rolling device according to claim 2, wherein the left reel is arranged on the winding needle seat, and the right reel is arranged on the right slider; when the left slider and When the right slider is relatively far away, the left reel and the right reel are relatively far away.
The film rolling device according to claim 3, wherein the film rolling device further comprises a left winding needle and a right winding needle, the left winding needle is arranged on the winding needle seat, the left clip and the left winding needle The reel is arranged on the left winding needle; the right winding needle is arranged on the right sliding block, and the right winding needle is arranged on the right winding needle.
The film rolling device according to claim 4, wherein the right winding needle is provided with an escape groove for accommodating the right clip.
The film rolling device according to claim 4, wherein the left clip is mounted on the left winding needle through a buffer assembly, the buffer assembly includes a first guide shaft and a buffer spring, and the left clip passes through the The first guide shaft is connected to the left winding needle, the buffer spring is sleeved on the first guide shaft and is located between the left clip and the left winding needle; when the left clip is pressed At this time, it can move along the first guide shaft and compress the buffer spring.
The film rolling device according to claim 4, wherein a receiving groove is provided on the winding needle seat, a second guide shaft is provided in the receiving groove, and the left slider and the right slider are both located at the And slide along the second guide shaft in the containing groove.
The film rolling device according to claim 7, wherein the winding needle seat comprises a base, an upper cover and a fixing plate installed on the base, the receiving groove is opened on the base, and the left winding needle It is arranged on the upper cover, and the thimble is movably pierced on the fixing plate.
The film rolling device according to any one of claims 1 to 8, wherein the elastic return member is a return spring, and there are two; both the left slider and the right slider are provided for mounting Mounting hole for the elastic reset piece.
The film rolling device according to any one of claims 1 to 8, wherein the free end of the thimble is provided with a first step surface and a second step surface, and the height of the first step surface is lower than that of the The second step surface is connected by a transition surface; when the second step surface is located between the left slider and the right slider, the left clamp and the right clamp are relatively close to achieve clamping.