CN210837818U

CN210837818U - Battery cover plate

Info

Publication number: CN210837818U
Application number: CN201922372637.4U
Authority: CN
Inventors: 游杰; 鄢勇; 陈富源
Original assignee: Jiangxi ANC New Energy Technology Co Ltd
Current assignee: Jiangxi ANC New Energy Technology Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-06-23
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses a battery cover plate, its characterized in that: the battery cover plate is provided with an explosion-proof valve, the explosion-proof valve comprises a circular bulge connected with the cover plate main body into a whole, an explosion-proof hole is formed in the bottom of the circular bulge, the diameter of the circular bulge is larger than the diameter of the explosion-proof hole, an explosion-proof piece is arranged in the explosion-proof hole, the diameter of the explosion-proof piece is larger than the diameter of the explosion-proof hole, and a circular pressure relief hole and 3 circular arc-shaped pressure relief holes are formed in the top of the circular bulge. The utility model has the advantages that: because the explosion-proof piece material is brittle, the explosion-proof piece can be protected by the integrated design. If the internal temperature of the battery reaches the thermal runaway state, the internal pressure of the battery continues to rise, the battery cover explosion-proof sheet is broken, and the substances in the battery are sprayed out of the pressure release hole along with high-pressure gas. The battery cover plate has the advantages of simplified manufacturing process, material saving, simple structure, better explosion-proof function and improved safety performance, and avoids using a protective plate which is easy to be damaged by external force.

Description

Battery cover plate

Technical Field

The utility model relates to a battery cover plate belongs to the lithium cell field of making.

Background

Lithium batteries have become the primary batteries for portable electronic products. Such batteries have a high capacity density and a competitive price, and are expected to remain the mainstream of the market in the coming years. Because of its excellent cycle performance, fast charge and discharge, high charging efficiency up to 100%, and large output power. The service life is long. Contains no toxic and harmful substances, and is called green battery.

Lithium batteries continue to pose a potential explosion hazard. Lithium is very active in chemical property and easy to burn, and when the battery is charged and discharged, the temperature inside the battery is continuously increased, and gas generated in the activation process expands, so that the internal pressure of the battery is increased. If the pressure reaches a certain degree, if the shell has a flaw, the shell can be broken, and liquid leakage, fire and even explosion can be caused. Due to the improvement of the process, people can design an explosion-proof wire when manufacturing a lithium battery shell, but once explosion happens, the explosion-proof wire has a limited function. Some manufacturers may then design an explosion-proof sheet on the cover plate of the battery. The explosion-proof sheet is made of fragile materials, and once the battery is subjected to conditions such as overlarge internal pressure, liquid leakage and the like, the explosion-proof sheet is broken due to the overlarge internal pressure, so that the explosion of the whole battery due to the overlarge internal pressure is avoided. However, since the material of the rupture disk is too brittle and is easily damaged unintentionally during assembly, transportation and use, a protective sheet is added above the rupture disk. In the traditional lithium battery cover plate, an opening is formed in a main body of the battery cover plate, and a protective sheet is added in the opening, but the protective sheet is made of fragile material and is easily damaged by external force in the processes of assembly, transportation and use. The fire extinguishing device and the fire extinguishing agent are added to the battery cover plate of a part of the designed safe battery shell, the production process of the method is extremely complex, and the cost for manufacturing the battery is invisibly increased.

Chinese patent CN 201620294466.1 discloses a lithium battery cover plate assembly, including apron body, anodal seat, negative pole seat, rivet, anodal connection piece, negative pole connection piece and explosion-proof valve, anodal connection piece and negative pole connection piece are connected in the bottom of apron body through four fix with rivet and are corresponding with the position of anodal seat and negative pole seat respectively, and anodal connection piece and negative pole connection piece level respectively extend to apron body width direction's a side. The utility model discloses a have explosion-proof effect, guarantee lithium ion battery's leakproofness, guarantee lithium ion battery safe handling. However, the added rivets increase the complexity of the process and reduce the assembly efficiency.

Chinese patent CN 201710911652.4 discloses a battery cover plate, battery cover plate is including being used for encapsulating the apron body in the uncovered department in battery case top, is equipped with the installation position that is used for installing output terminal on the apron body, and battery cover plate is still including locating the fire extinguishing agent cavity on the apron body for the fire extinguishing agent who stores the fire extinguishing agent holds the chamber, and intercommunication fire extinguishing agent holds the interior blast resistant construction of chamber and battery case inner chamber. The battery cover plate can automatically extinguish fire when the battery unit is in a fire, is more reliable to use, and can select the fire extinguishing agent with the service life the same as or even higher than that of the battery unit. But the added fire suppressant compartment and fire suppressant material would add virtually to the cost of making the battery.

Disclosure of Invention

In order to solve the problem, the utility model aims to provide a battery cover plate, the fragile explosion-proof piece of material can be protected in the integrated design, assembly efficiency can be improved again. If the internal temperature of the battery reaches the thermal runaway state, the internal pressure of the battery continues to rise, the battery cover explosion-proof sheet is broken, and the substances in the battery are sprayed out of the pressure release hole along with high-pressure gas. While preventing the battery from exploding, the structure is simple, so that the assembly efficiency is improved

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the battery cover plate is provided with an explosion-proof valve, the explosion-proof valve comprises a circular bulge connected with the cover plate main body into a whole, an explosion-proof hole is formed in the bottom of the circular bulge, the diameter of the circular bulge is larger than the diameter of the explosion-proof hole, an explosion-proof piece is arranged in the explosion-proof hole, the diameter of the explosion-proof piece is larger than the diameter of the explosion-proof hole, and a circular pressure relief hole and 3 circular arc-shaped pressure relief holes are formed in the top of the bulge.

Furthermore, the height of the circular bulge of the explosion-proof valve is 0.2-1mm, and the diameter of the circular bulge is 11-12 mm.

Furthermore, the diameter of the explosion-proof hole is 9.5-10.5mm, and the diameter of the explosion-proof hole is smaller than that of the circular bulge.

Furthermore, the diameter of the circular pressure relief hole is 4-5 mm.

Furthermore, the explosion-proof sheet is a commercially available common aluminum foil, and the diameter of the explosion-proof sheet is 11-12mm larger than that of the explosion-proof hole.

The invention adopts the structure to obtain the beneficial effects that: the circular convex part of the explosion-proof valve and the battery cover plate main body are integrally designed, so that a protective sheet which is easily damaged by external force can be prevented from being used. Therefore, the explosion-proof sheet material is brittle, and the explosion-proof sheet can be protected by the integrated design. If the internal temperature of the battery reaches the thermal runaway state, the internal pressure of the battery continues to rise, the battery cover explosion-proof sheet is broken, and the substances in the battery are sprayed out of the pressure release hole along with high-pressure gas. The battery cover plate has the advantages of simplified manufacturing process, material saving, simple structure, better explosion-proof function and improved safety performance, and avoids using a protective plate which is easy to be damaged by external force.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic cross-sectional view of the present invention.

Fig. 3 is a schematic view of the overlooking structure of the pressure relief hole of the present invention.

The anti-explosion cover plate comprises a cover plate body 1, a cover plate main body 2, a circular bulge 3, a circular pressure relief hole 4, an anti-explosion hole 5, an anti-explosion sheet 6 and a circular arc pressure relief hole.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the following embodiments, and the technical features or the connection relations of the present invention, which are not described in detail, are the prior art adopted.

The present invention will be described in further detail with reference to fig. 1, 2 and 3.

The utility model discloses a battery cover plate sets up explosion-proof valve on this apron, and explosion-proof valve includes and laps main part (1) even circular arch (2) as an organic whole.

Circular protruding bottom is equipped with explosion-proof hole (4), and circular bellied diameter is greater than the diameter of explosion-proof hole (4), and explosion-proof hole (4) are provided with explosion-proof piece (5), and the diameter of explosion-proof piece (5) is greater than the diameter of explosion-proof hole (4), and circular arch (4) top is provided with circular pressure release hole (3) and 3 convex pressure release holes (6).

The height of the circular bulge (2) of the explosion-proof valve is 0.2-1mm, and the diameter of the circular bulge is 11-12 mm.

The diameter of the explosion-proof hole (4) is 9.5-10.5mm, and the diameter of the explosion-proof hole (4) is smaller than that of the circular bulge (2).

The diameter of the circular pressure relief hole (3) is 4-5 mm.

The explosion-proof sheet (5) is a commercially available common aluminum foil, and the diameter of the explosion-proof sheet (5) is larger than that of the explosion-proof hole and is 11-12 mm.

And (3) packaging the battery cover and the battery shell, then manufacturing a pressurizing hole on the battery shell, pressurizing the battery shell from the pressurizing hole, and carrying out a pressurizing experiment on the battery. When the pressure is applied to a certain degree, the explosion-proof sheet (5) is exploded, the air pressure is ejected from the explosion-proof sheet, and the battery shell is not damaged and deformed.

The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.

Claims

1. A battery cover plate, characterized in that: the battery cover plate is provided with an explosion-proof valve, the explosion-proof valve comprises a circular bulge (2) which is connected with a cover plate main body (1) into a whole, an explosion-proof hole (4) is formed in the bottom of the bulge (2), an explosion-proof sheet (5) is arranged in the explosion-proof hole (4), and a circular pressure relief hole (3) and 3 circular arc-shaped pressure relief holes (6) are formed in the top of the bulge (2).

2. A battery cover plate according to claim 1, wherein: the height of the circular bulge (2) is 0.2-1mm, and the diameter of the circular bulge is 11-12 mm.

3. A battery cover plate according to claim 1, wherein: the diameter of the explosion-proof hole (4) is 9.5-10.5mm, and the diameter of the explosion-proof hole is smaller than that of the circular bulge.

4. A battery cover plate according to claim 1, wherein: the diameter of the circular pressure relief hole (3) is 4-5 mm.

5. A battery cover plate according to claim 1, wherein: the diameter of the explosion-proof sheet is larger than that of the explosion-proof hole and is 11-12 mm.