CN220358267U

CN220358267U - Battery ventilation relief valve and battery cover plate

Info

Publication number: CN220358267U
Application number: CN202321895629.8U
Authority: CN
Inventors: 陈心; 杨允杰; 汪勇; 郭红祥; 闫小舍; 张文齐; 韩郑旭
Original assignee: Huading Guolian Sichuan Power Battery Co ltd
Current assignee: Huading Guolian Sichuan Power Battery Co ltd
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2024-01-16
Anticipated expiration: 2033-07-18

Abstract

The utility model discloses a battery ventilation pressure release valve and a battery cover plate, wherein the battery ventilation pressure release valve comprises a shell, a cover plate, a compression spring, a sealing component and a waterproof ventilation film, wherein an air inlet is arranged in the middle of the lower end of the shell, an annular limiting table is arranged on the inner wall of the lower part of the air inlet, and the sealing component is matched and arranged in the air inlet at the upper end of the annular limiting table; the upper end of the shell is opened and communicated with the air inlet, the cover plate is sealed at the opening of the upper end of the shell, and the compression spring is abutted between the sealing component and the cover plate; the lower end of the shell around the sealing component is provided with a plurality of bottom exhaust holes communicated with the lower part of the shell and the inside of the shell, and the waterproof and breathable film is attached to the bottom exhaust holes; the cover plate is provided with a pressure relief through hole. The battery cover plate comprises a battery cover plate body, a pressure relief valve mounting hole is formed in the battery cover plate body, and a battery ventilation pressure relief valve is arranged in the pressure relief valve mounting hole. The utility model can avoid explosion caused by excessive internal pressure of the battery due to insufficient exhaust quantity.

Description

Battery ventilation relief valve and battery cover plate

Technical Field

The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a battery ventilation pressure relief valve and a battery cover plate.

Background

The lithium ion battery has the advantages of high mass specific energy, long service life, high rated voltage, low self-discharge rate, environment friendliness and the like, and is widely applied to the fields of portable electronic equipment, electric automobiles and the like. Along with the development of battery technology, the application fields of various batteries are wider and wider, but gas is difficult to discharge due to the limitation of the tightness of the batteries because of the gas generated in the charging and discharging processes of the batteries, and the generated gas is attached to a diaphragm and a pole piece, so that lithium is separated from the batteries, and the capacity and the cycle life of the batteries are reduced. And as the internal pressure of the battery continuously rises, explosion can be possibly caused once the internal pressure exceeds a certain pressure, and huge losses are caused to lives and properties of people.

Disclosure of Invention

The utility model aims to provide a battery ventilation pressure relief valve and a battery cover plate, which are used for solving the problems in the prior art.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

on one hand, the utility model provides a battery ventilation pressure release valve, which comprises a shell, a cover plate, a compression spring, a sealing component and a waterproof ventilation membrane, wherein an air inlet is formed in the middle of the lower end of the shell, an annular limiting table is arranged on the inner wall of the lower part of the air inlet, and the sealing component is installed in the air inlet at the upper end of the annular limiting table in a matching way; the upper end of the shell is opened and communicated with the air inlet, the cover plate is sealed at the opening of the upper end of the shell, and the compression spring is abutted between the sealing component and the cover plate; the lower end of the shell around the sealing component is provided with a plurality of bottom exhaust holes communicated with the lower part of the shell and the inside of the shell, and the waterproof breathable film is attached to the bottom exhaust holes; and the cover plate is provided with a pressure relief through hole.

As a preferable technical scheme in the utility model, the four bottom exhaust holes are arranged at the lower end of the shell around the sealing component.

As a preferable technical scheme in the utility model, the waterproof breathable film is attached to the air inlet end or the air outlet end of the bottom exhaust hole.

As a preferable technical scheme in the utility model, the sealing component is in interference fit with the inner wall of the air inlet hole at the upper end of the annular limiting table, and the interference is 0.1-0.3mm.

As a preferable technical scheme in the utility model, the upper end of the sealing component is provided with a limit post, and the compression spring is sleeved outside the limit post.

As a preferable technical scheme in the utility model, the upper end of the limiting column is inserted into the pressure relief through hole, and the diameter of the limiting column is smaller than the inner diameter of the pressure relief through hole.

As a preferable technical scheme in the utility model, the cover plate is welded or screwed at the upper end opening of the shell.

As a preferred technical solution in the present utility model, the compression spring and the sealing assembly are both made of neoprene.

On the other hand, the utility model also provides a battery cover plate, which comprises a battery cover plate body, wherein the battery cover plate body is provided with a pressure release valve mounting hole, and the battery ventilation pressure release valve of any one of the above is arranged in the pressure release valve mounting hole.

The beneficial effects are that: the battery ventilation pressure release valve and the battery cover plate can exhaust according to different conditions of the lithium battery, are more reasonable, have different gas production rates in different service life periods, and can exhaust through the waterproof and breathable film and then discharge to the outside through the pressure release through holes when the pressure in the battery is smaller; when the gas generated in the battery is more and exceeds a certain range, the force applied to the sealing component exceeds the spring force of the compression spring, the compression spring is further compressed, and then the air is exhausted through the air inlet hole, so that the redundant gas is removed, the capacity and the cycle life of the battery can be improved, and explosion and the like caused by overlarge pressure in the battery due to insufficient exhaust capacity of the bottom exhaust hole are avoided.

Drawings

FIG. 1 is a cross-sectional view of a battery venting pressure relief valve of the present utility model;

fig. 2 is a schematic structural view of a battery cover plate according to the present utility model.

In the figure: 1-a battery cover plate body; 21-a housing; 211-air inlet holes; 212-an annular limiting table; 213-bottom vent holes; 22-cover plate; 221-a pressure relief through hole; 23-compressing the spring; 24-a seal assembly; 241-limit column; 25-waterproof breathable film.

Detailed Description

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the present utility model will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the drawings is only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art. It should be noted that the description of these examples is for aiding in understanding the present utility model, but is not intended to limit the present utility model.

Examples:

as shown in fig. 1, the embodiment provides a battery ventilation and pressure relief valve, which comprises a shell 21, a cover plate 22, a compression spring 23, a sealing component 24 and a waterproof ventilation membrane 25, wherein an air inlet 211 is arranged in the middle of the lower end of the shell 21, an annular limiting table 212 is arranged on the inner wall of the lower part of the air inlet 211, the sealing component 24 is matched and installed in the air inlet 211 at the upper end of the annular limiting table 212, so that the sealing component 24 is prevented from penetrating out of the air inlet 211, and the sealing component 24 is also utilized to realize effective sealing of the air inlet 211; the upper end opening of casing 21 and intercommunication inlet port 211 for casing 21 forms a both ends open-ended tubular structure, and apron 22 seals in the upper end opening part of casing 21, guarantees the stability of apron 22, and compression spring 23 butt can give the sealing component 24 a spring force through compression spring 23 between sealing component 24 and apron 22, makes sealing component 24 can stable shutoff inlet port 211 under the spring force, and the size of spring force, and according to actual demand setting can, and no further explanation here.

The lower end of the shell 21 around the sealing assembly 24 is provided with a plurality of bottom vent holes 213 communicated with the lower part of the shell 21 and the inside of the shell 21, and the waterproof and breathable film 25 is attached to the bottom vent holes 213, so that the bottom vent holes 213 can only breathe freely without liquid passing through, and liquid is prevented from entering the battery through the waterproof and breathable film 25; the cover plate 22 is provided with a pressure relief through hole 221.

The utility model can exhaust according to different conditions of the lithium battery, is more reasonable, the lithium battery has different service life periods and different gas production amounts, and when the pressure in the battery is smaller, the lithium battery can pass through the waterproof breathable film 25 to exhaust through the bottom exhaust hole 213 and then is discharged to the outside from the pressure release through hole 221; when the gas generated in the battery is more and exceeds a certain range, the force applied to the sealing assembly 24 exceeds the spring force of the compression spring 23, the compression spring 23 is further compressed, and then the air is exhausted through the air inlet 211, so that the redundant gas is discharged, the capacity and the cycle life of the battery can be improved, and explosion and the like caused by overlarge internal pressure of the battery due to insufficient exhaust capacity of the bottom air outlet 213 are avoided.

As a preferred embodiment in this embodiment, it should be further explained that four bottom exhaust holes 213 are provided, and the four bottom exhaust holes 213 are uniformly distributed at the lower end of the housing 21 around the sealing assembly 24, so that the pressure is small, and the ventilation and pressure relief valve of the battery can exhaust more uniformly, so as to ensure the pressure balance inside the battery.

As a preferred embodiment of the present embodiment, it should be further described that the waterproof and breathable film 25 is attached to the air inlet end or the air outlet end of the bottom air outlet hole 213, so that the air entering the bottom air outlet hole 213 must pass through the waterproof and breathable film 25, and then the waterproof and breathable film 25 achieves the function of filtering water, preferably, the waterproof and breathable film 25 is attached to the air outlet end of the bottom air outlet hole 213, so as to mainly avoid the external liquid from entering the battery.

As a preferred embodiment of this embodiment, it should be further described that the sealing component 24 is in interference fit with the inner wall of the air inlet 211 at the upper end of the annular limiting platform 212, and the interference is 0.1-0.3mm, so as to achieve effective sealing of the air inlet 211, and prevent air from entering the battery at ordinary times. It should be further noted that, at ordinary times, since the bottom vent hole 213 is relatively small and the internal pressure of the battery is normally greater than that of the outside, it is ensured that the outside air does not enter the battery from the bottom vent hole 213 through several relatively small bottom vent holes 213.

As a preferred embodiment in this embodiment, it should be further described that the upper end of the sealing component 24 is provided with a limiting post 241, and the compression spring 23 is sleeved outside the limiting post 241, so that the stability of the compression spring 23 can be improved, preferably, when the limiting post 241 and the pressure release through hole 221 are not correspondingly arranged, the length of the limiting post 241 can be smaller than the interval between the sealing component 24 and the cover plate 22, so that the sealing component 24 can open the air inlet 211 in a movable manner.

As a preferred implementation manner in this embodiment, it should be further described that, the upper end of the limiting post 241 is inserted into the pressure relief through hole 221, and the diameter of the limiting post 241 is smaller than the inner diameter of the pressure relief through hole 221, so that the exhaust of the pressure relief through hole 221 is not affected, and meanwhile, the pressure relief through hole 221 is utilized to limit the limiting post 241, so that the stability of the compression spring 23 is further enhanced, and the air inlet hole 211 can be accurately plugged when the sealing assembly 24 is reset after being separated from the air inlet hole 211.

As a preferred embodiment of the present embodiment, it should be further noted that the cover 22 is welded or screwed to the upper end opening of the housing 21, so as to ensure stability of the cover 22, and thus stability of the compression spring 23 d.

As a preferred embodiment of the present embodiment, it should be further explained that the compression spring 23 and the sealing assembly 24 are made of neoprene. The neoprene has good physical and mechanical properties, such as oil resistance, heat resistance, flame resistance, sunlight resistance, ozone resistance, acid and alkali resistance, and chemical reagent resistance, is more stable in corrosive gas, and can ensure stability and sealing effect.

The utility model also provides a battery cover plate, which comprises a battery cover plate body 1, wherein the battery cover plate body 1 is provided with a pressure release valve mounting hole, the battery ventilation pressure release valve is arranged in the pressure release valve mounting hole, after the battery cover plate body 1 is arranged, the gas in the battery can be effectively exhausted in stages, redundant gas is exhausted, the battery capacity and the cycle life can be improved, and explosion and the like caused by overlarge pressure in the battery due to insufficient exhaust capacity of the bottom exhaust hole can be avoided.

Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the utility model and is not intended to limit the scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides a ventilative relief valve of battery, its characterized in that includes casing (21), apron (22), compression spring (23), seal assembly (24) and waterproof ventilated membrane (25), and the middle part of casing (21) lower extreme is provided with inlet port (211), is provided with annular spacing platform (212) on the inner wall of inlet port (211) lower part, and seal assembly (24) matches and installs in inlet port (211) of annular spacing platform (212) upper end; the upper end of the shell (21) is open and communicated with the air inlet hole (211), the cover plate (22) is sealed at the upper end opening of the shell (21), and the compression spring (23) is abutted between the sealing assembly (24) and the cover plate (22); the lower end of the shell (21) around the sealing assembly (24) is provided with a plurality of bottom exhaust holes (213) communicated with the lower part of the shell (21) and the inside of the shell (21), and a waterproof breathable film (25) is attached to the bottom exhaust holes (213); the cover plate (22) is provided with a pressure relief through hole (221).

2. The battery ventilation and pressure relief valve according to claim 1, wherein four bottom vent holes (213) are provided, and the four bottom vent holes (213) are uniformly distributed at the lower end of the housing (21) around the sealing assembly (24).

3. A battery venting pressure relief valve according to claim 1 or 2, wherein the waterproof venting membrane (25) is attached to the inlet or outlet end of the bottom vent (213).

4. The battery ventilation and pressure relief valve according to claim 1, wherein the sealing assembly (24) is in interference fit with the inner wall of the air inlet hole (211) at the upper end of the annular limiting table (212), and the interference is 0.1-0.3mm.

5. The battery ventilation and pressure relief valve according to claim 1 or 4, characterized in that a limit post (241) is provided at the upper end of the sealing assembly (24), and the compression spring (23) is sleeved outside the limit post (241).

6. The ventilation and pressure relief valve for a battery according to claim 5, wherein the upper end of the limiting post (241) is inserted into the pressure relief through hole (221), and the diameter of the limiting post (241) is smaller than the inner diameter of the pressure relief through hole (221).

7. A battery venting pressure relief valve according to claim 1, wherein the cover plate (22) is welded or screwed to the upper end opening of the housing (21).

8. A battery venting pressure relief valve according to claim 1, wherein the compression spring (23) and the sealing assembly (24) are both made of neoprene.

9. A battery cover plate, which is characterized by comprising a battery cover plate body (1), wherein a pressure release valve mounting hole is formed in the battery cover plate body (1), and the battery ventilation pressure release valve according to any one of claims 1-8 is mounted in the pressure release valve mounting hole.