CN213401333U

CN213401333U - Battery cover plate and lithium ion battery

Info

Publication number: CN213401333U
Application number: CN202021900833.0U
Authority: CN
Inventors: 黄燊; 冯志博
Original assignee: Yinlong New Energy Co Ltd
Current assignee: Yinlong New Energy Co Ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2021-06-08
Anticipated expiration: 2030-09-03

Abstract

The utility model discloses a battery cover plate and a lithium ion battery, wherein the battery cover plate comprises a plate body, a liquid injection hole is arranged on the plate body, and a convex edge is formed at the edge of the liquid injection hole; a cap is arranged on the liquid injection hole, and the cap is wrapped outside the convex edge and seals the liquid injection hole; when the internal pressure of the battery exceeds a threshold value, the cover cap is squeezed by the internal pressure of the battery to open the liquid injection hole. Battery apron regard the block as explosion-proof piece, combine with annotating the liquid hole, simplified apron processing technology, reduced apron cost of manufacture.

Description

Battery cover plate and lithium ion battery

Technical Field

The utility model belongs to the battery field especially relates to a battery cover plate and lithium ion battery.

Background

The lithium ion battery has five major structures, namely a positive plate, a negative plate, a diaphragm, electrolyte and a shell, and for the aluminum shell lithium ion battery, the shell is generally formed by welding a cover plate and a lower shell.

Wherein, distribute on the apron just/negative pole post, annotate liquid hole and explosion-proof piece: in the production process of the battery, after electrolyte is injected into the battery through the electrolyte injection hole and the battery is formed, the electrolyte injection hole is closed; the explosion-proof sheet is applied to the terminal stage of the use of the battery, a large amount of gas is generated by chemical reaction and accumulated in the battery, and when the pressure of the gas on the explosion-proof sheet exceeds a certain threshold value, the explosion-proof sheet is opened to communicate the inside and the outside of the battery to exhaust the gas, so that the explosion of the battery due to the overlarge internal gas pressure is prevented.

And set up notes liquid hole and explosion-proof piece respectively simultaneously on the apron, the technology is comparatively loaded down with trivial details, the preparation of apron not convenient for.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery apron and lithium ion battery to lithium ion battery's production is convenient for.

In order to achieve the above object, the utility model discloses a battery cover plate and lithium ion battery's concrete technical scheme as follows:

a battery cover plate comprises a plate body, wherein a liquid injection hole is formed in the plate body, and a convex edge is formed at the edge of the liquid injection hole; a cap is arranged on the liquid injection hole, and the cap is wrapped outside the convex edge and seals the liquid injection hole; when the internal pressure of the battery exceeds a threshold value, the cover cap is squeezed by the internal pressure of the battery to open the liquid injection hole.

Further, the cap is pressed by the internal pressure of the battery to separate the whole body from the convex edge so as to open the liquid injection hole.

Furthermore, the cap is provided with an indentation which divides the cap into a fixed part and a separation part, and the separation part is extruded by the pressure inside the battery to separate from the fixed part so as to open the liquid injection hole.

Furthermore, the block includes the lid, and the laminating elastic layer on the lid inner wall.

Further, the cover body comprises a top part and a side part arranged around the edge of the top part; the side part is pressed and attached on the convex edge, and the top part is closed with the liquid injection hole.

Further, the elastic layer is a sealing rubber ring sleeved in the cover body; the sealing rubber ring comprises a top layer attached to the inner wall of the top part and a side layer attached to the inner wall of the side part, and the top layer and the side layer are integrally arranged.

Further, the lower side of the side part protrudes out of the side layer, so that the tail end edge of the side part is deformed by punching and is attached to the convex edge.

Furthermore, a groove body is formed on the plate body, and the liquid injection hole and the convex edge are both arranged in the groove body.

Furthermore, a convex edge is formed on the edge of the groove body, and a rubber cover for sealing the groove body is bonded on the convex edge.

A lithium ion battery comprises the battery cover plate.

The utility model discloses a battery apron and lithium ion battery have following advantage: annotate liquid hole and explosion-proof piece and all communicate inside and outside the battery, under the condition that does not influence battery normal use, integrate into a structure with both, simplified apron processing technology, reduced apron cost of manufacture.

Drawings

Fig. 1 is a cross-sectional view of a battery cover plate of the present invention;

fig. 2 is an enlarged view of a portion a of fig. 1.

The notation in the figure is:

1. a plate body; 2. a positive pole column; 3. a negative electrode post; 4. a liquid injection hole; 41. a convex edge; 42. a stopper; 5. capping; 51. a cover body; 511. a top portion; 512. a side portion; 52. an elastic layer; 521. a top layer; 522. A side layer; 6. a trough body; 61. a convex edge; 7. and (6) a rubber cover.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the following description is made in detail with reference to the accompanying drawings.

As shown in fig. 1, the lithium ion battery of the present invention includes a battery cover plate. The battery cover plate comprises a plate body 1, wherein a positive pole post 2 and a negative pole post 3 are formed at two ends of the plate body 1, a liquid injection hole 4 is formed between the positive pole post 2 and the negative pole post 3, and a convex edge 41 is formed at the edge of the liquid injection hole 4; the liquid injection hole 4 is provided with a cover cap 5, and the cover cap 5 is wrapped outside the convex edge 41 and seals the liquid injection hole 4; when the internal pressure of the battery exceeds a threshold value, the cap 5 is pressed by the internal pressure of the battery to open the liquid injection hole 4, so that the explosion-proof function is realized.

The cap 5 can be pressed by the internal pressure of the battery to be wholly separated from the convex edge 41 so as to open the liquid injection hole 4; the cap 5 may be provided with an indentation dividing the cap 5 into a fixed portion and a separate portion, and the separate portion may be separated from the fixed portion by pressing the internal pressure of the battery to open the pour hole 4. And a stopper 42 is formed on the inner wall of the pour hole 4 to control the flow rate.

The cap 5 comprises a cover body 51, and an elastic layer 52 is attached to the inner wall of the cover body 51 to ensure the sealing effect. The cover 51 includes a top 511 and sides 512 disposed around the edges of the top 511. The side part 512 is pressed against the flange 41, and the top part 511 closes the pour hole 4.

The elastic layer 52 is a sealing rubber ring sleeved in the cover 51. The sealing rubber ring comprises a top layer 521 attached to the inner wall of the top portion 511 and a side layer 522 attached to the inner wall of the side portion 512, wherein the top layer 521 and the side layer 522 are integrally arranged. The underside of the side portion 512 protrudes from the side layer 522 so that the end edge of the side portion 512 is stamped and deformed to fit over the ledge 41.

A groove body 6 is formed on the plate body 1, and the liquid injection hole 4 and the convex edge 41 are both arranged in the groove body 6. The edge of the groove body 6 is provided with a convex edge 61, and the convex edge 61 is adhered with a rubber cover 7 for sealing the groove body 6 so as to prevent dust and water.

Through the mode, can integrate into a structure with annotating liquid hole 4 and explosion-proof piece to have the function of explosion-proof piece, thereby form a neotype lithium ion battery apron.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims

1. A battery cover plate comprises a plate body (1), wherein a liquid injection hole (4) is formed in the plate body (1), and is characterized in that a convex edge (41) is formed at the edge of the liquid injection hole (4); a cover cap (5) is arranged on the liquid injection hole (4), and the cover cap (5) is wrapped outside the convex edge (41) and seals the liquid injection hole (4); when the internal pressure of the battery exceeds a threshold value, the cap (5) is pressed by the internal pressure of the battery to open the liquid injection hole (4).

2. The battery lid plate according to claim 1, wherein the cap (5) is separated from the flange (41) by pressing the whole body inside the battery to open the pour hole (4).

3. The battery cover plate according to claim 1, wherein the cap (5) is provided with an indentation dividing the cap (5) into a fixing portion and a separating portion, and the separating portion is separated from the fixing portion by pressure inside the battery to open the pour hole (4).

4. The battery cover plate according to claim 1, wherein the cap (5) comprises a cover body (51), and an elastic layer (52) is attached to the inner wall of the cover body (51).

5. The battery cover plate according to claim 4, wherein the cover body (51) comprises a top portion (511), and a side portion (512) disposed around an edge of the top portion (511); the side part (512) is pressed and attached to the convex edge (41), and the top part (511) closes the liquid injection hole (4).

6. The battery cover plate according to claim 5, wherein the elastic layer (52) is a sealing rubber ring sleeved in the cover body (51); the sealing rubber ring comprises a top layer (521) attached to the inner wall of the top portion (511) and a side layer (522) attached to the inner wall of the side portion (512), and the top layer (521) and the side layer (522) are integrally arranged.

7. The battery cover plate according to claim 6, wherein the underside of the side portion (512) protrudes from the side layer (522), so that the end edge of the side portion (512) is press-deformed and fits over the protruding edge (41).

8. The battery cover plate according to claim 1, wherein a groove body (6) is formed on the plate body (1), and the liquid injection hole (4) and the convex edge (41) are both arranged in the groove body (6).

9. The battery cover plate according to claim 8, wherein a flange (61) is formed on the edge of the groove body (6), and a rubber cover (7) for closing the groove body (6) is bonded on the flange (61).

10. A lithium ion battery comprising the battery cover plate according to any one of claims 1 to 9.