CN219759865U

CN219759865U - Battery relief valve and battery cover plate

Info

Publication number: CN219759865U
Application number: CN202321370215.3U
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 Power Battery Co ltd
Current assignee: Huading Guolian Power Battery Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-09-26
Anticipated expiration: 2033-05-31

Abstract

The utility model discloses a battery pressure relief valve and a battery cover plate, wherein a central through hole is formed in the middle of a shell in the battery pressure relief valve, an annular limiting table is arranged on the inner wall of the central through hole corresponding to the lower end of the shell, and at least two exhaust grooves penetrating through the upper end of the shell are formed in the inner wall of the central through hole above the annular limiting table; the sealing cover is connected to the upper end of the shell in a sealing way, and is provided with at least two pressure relief holes which are in one-to-one correspondence with the exhaust grooves; the air spring is installed in the central through hole, and the lower extreme of air spring seals the butt on annular spacing bench, and air spring's upper end and sealed lid butt. The battery cover plate body of the battery cover plate is provided with a pressure relief valve mounting hole, and the battery pressure relief valve is mounted in the pressure relief valve mounting hole. The utility model assists the battery to exhaust, improves the safety of the battery, and can prevent the air from entering the battery to influence the performance of the battery.

Description

Battery 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 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 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 pressure release valve, which comprises a shell, a sealing cover and an air spring, wherein the middle part of the shell is provided with a central through hole penetrating through the upper end and the lower end of the shell, the inner wall of the central through hole corresponding to the lower end of the shell is provided with an annular limiting table, and the inner wall of the central through hole above the annular limiting table is provided with at least two exhaust grooves penetrating through the upper end of the shell; the sealing cover is connected to the upper end of the shell in a sealing way, and at least two pressure relief holes which are in one-to-one correspondence with the exhaust grooves are formed in the sealing cover; the air spring is arranged in the central through hole, the lower end of the air spring is in sealing abutting connection with the annular limiting table, and the upper end of the air spring is in abutting connection with the sealing cover.

As a preferable technical scheme in the utility model, the lower end of the air spring is connected with a sealing ring in a matched manner, and the sealing ring is abutted against the annular limiting table.

As a preferable technical scheme in the utility model, an annular inner groove is formed in the inner wall of the sealing ring, and the lower end of the air spring is matched and clamped in the annular inner groove.

As a preferable technical scheme in the utility model, the air spring comprises a bottom bracket and an air bag internally provided with compressed air, and the air bag is arranged at the upper end of the bottom bracket; the lower end of the collet is connected with the sealing ring in a matched way, and the upper end of the air bag is abutted with the sealing cover.

As a preferable technical scheme in the utility model, the sealing ring is made of neoprene rubber and is in interference fit with the inner wall of the central through hole.

As a preferable technical scheme in the utility model, the lower end of the sealing cover is provided with a limit groove, and the upper end of the air spring is arranged in the limit groove.

As a preferable technical scheme in the utility model, the inner diameter of the limiting groove is larger than the diameter of the upper end of the air spring.

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 pressure release valve according to any one of the technical schemes is mounted in the pressure release valve mounting hole.

The beneficial effects are that: the air spring is arranged in the shell, so that the risks of abnormal discharge and short circuit in the battery caused by introducing metal scraps in the battery in the use process can be avoided, the air inlet of the shell is blocked by the air spring, the tightness is ensured, the battery generates air in the use process of the battery pressure release valve, when the pressure of the gas in the battery is higher than the elastic force of the air spring, the lower end of the air spring is driven to move upwards, the whole air spring is further compressed, the air inlet of the shell is communicated with the exhaust groove, the gas can be exhausted from the pressure release hole along the exhaust groove, the battery is assisted to exhaust, the safety of the battery is improved, and after the gas in the battery is exhausted, the pressure in the battery is reduced, the air spring resets and reseals the air inlet of the shell, the inside of the battery is sealed, and the influence on the performance of the battery is avoided.

Drawings

FIG. 1 is a schematic diagram of a battery pressure relief valve;

FIG. 2 is a cross-sectional view of a battery pressure relief valve;

FIG. 3 is a schematic view of the structure of the housing in the battery pressure relief valve;

FIG. 4 is a schematic view of the seal ring in the battery pressure relief valve;

fig. 5 is a schematic structural view of a battery cover plate.

In the figure: 1-a housing; 101-an annular limiting table; 102-an exhaust groove; 2-sealing cover; 201-a pressure relief hole; 202-a limit groove; 3-an air spring; 301-a shoe; 302-an air bag; 4-a sealing ring; 401-an annular inner groove; 5-battery cover plate body.

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.

Embodiment one:

as shown in fig. 1 to fig. 4, this embodiment provides an aspect, the present utility model provides a battery pressure release valve, including a casing 1, a sealing cover 2 and an air spring 3, where the air spring 3 can avoid introducing metal chips inside the battery during use, thereby causing risks of abnormal discharge and short circuit inside the battery, a central through hole penetrating through the upper and lower ends of the casing 1 is provided in the middle of the casing 1, an annular limiting table 101 is provided on the inner wall of the central through hole corresponding to the lower end of the casing 1, the center of the annular limiting table 101 is used as an air inlet of the casing 1, at least two air exhaust grooves 102 penetrating through the upper end of the casing 1 are provided on the inner wall of the central through hole above the annular limiting table 101, preferably, all the air exhaust grooves 102 are uniformly distributed on the inner wall of the through hole; the sealing cover 2 is connected to the upper end of the shell 1 in a sealing way, can be in bolt connection or welding, preferably welding, has better sealing performance, and is provided with at least two pressure relief holes 201 which are in one-to-one correspondence with the air discharge grooves 102, so that each air discharge groove 102 can carry out air discharge and pressure relief through one pressure relief hole 201; the air spring 3 is installed in the center through hole, the lower extreme sealing butt of air spring 3 is on annular spacing platform 101, the upper end and the sealed lid 2 butt of air spring 3, the air inlet shutoff of casing 1 under the normal condition, the leakproofness has been guaranteed, the upper end and the sealed lid 2 butt of air spring 3, guarantee the stability of air spring 3, and this battery relief valve is in the use, the battery produces gas, when the inside gas pressure of battery is greater than the elastic force of air spring 3, will drive the lower extreme upward movement of air spring 3, and then compress whole air spring 3, make the air inlet intercommunication exhaust duct 102 of casing 1, make gas can follow relief hole 201 along exhaust duct 102 and discharge, auxiliary battery is discharged, improve battery safety, after the inside gas discharge of battery, the inside pressure of battery descends, air spring 3 resets and reseals the air inlet of casing 1, it is sealed to avoid inside entering air of battery, influence battery performance.

According to the utility model, the air spring 3 is arranged in the shell, so that risks of abnormal discharge and short circuit in the battery caused by introducing metal scraps in the battery in the use process can be avoided, the air inlet of the shell 1 is blocked by the air spring 3, the tightness is ensured, the battery generates air in the use process of the battery pressure release valve, when the pressure of the air in the battery is higher than the elastic force of the air spring 3, the lower end of the air spring 3 is driven to move upwards, the whole air spring 3 is compressed, the air inlet of the shell 1 is communicated with the exhaust groove 102, the air can be exhausted from the pressure release hole 201 along the exhaust groove 102, the battery is assisted to exhaust, the safety of the battery is improved, and after the air in the battery is exhausted, the pressure in the battery is reduced, the air spring 3 resets and reseals the air inlet of the shell 1, the inside of the battery is sealed, and the performance of the battery is prevented from being influenced.

As a preferred implementation manner in this embodiment, it should be further explained that the lower end of the air spring 3 is cooperatively connected with the sealing ring 4, and the sealing ring 4 abuts against the annular limiting platform 101, so that the sealing effect of the air spring 3 on the air inlet of the housing 1 can be enhanced, and further, the air entering the battery during sealing can be effectively avoided.

As a preferred embodiment in this embodiment, it should be further explained that an annular inner groove 401 is provided on the inner wall of the sealing ring 4, the lower end of the air spring 3 is matched and clamped in the annular inner groove 401, and the sealing ring 4 can be quickly installed on the air spring 3 through the clamping of the annular inner groove 401, and the stability of the sealing ring 4 on the air spring 3 can be ensured.

As a preferred implementation manner of this embodiment, it should be further explained that the air spring 3 includes a bottom bracket 301 and a gas bag 302 with compressed air inside, and the gas bag 302 is disposed at the upper end of the bottom bracket 301; the lower extreme and the sealing washer 4 cooperation of collet 301 are connected, and the upper end and the sealed lid 2 looks butt of gasbag 302 guarantee the stability of air spring 3, when the battery produced gas, gaseous butt pressure collet 301 for establish compressed air's gasbag 302 in the collet 301 compression, and then make collet 301 slide upwards, make the gas in the battery can communicate exhaust groove 102, then exhaust through pressure release hole 201, after the exhaust is accomplished, gasbag 302 resets and drives collet 301 and reset, forms the seal to the air inlet of battery relief valve again.

As a preferred implementation of this example, it should be further explained that the sealing ring 4 is made of neoprene, and the sealing ring 4 is in interference fit with the inner wall of the central through hole. The neoprene has good physical and mechanical properties, oil resistance, heat resistance, flame resistance, sunlight resistance, ozone resistance, acid and alkali resistance and chemical reagent resistance, can ensure stability and sealing effect, and the sealing ring 4 is in interference fit with the inner wall of the central through hole, so that the sealing performance can be further enhanced, and air is prevented from entering the battery.

As a preferred embodiment in this embodiment, it should be further explained that the lower end of the sealing cover 2 is provided with a limiting groove 202, the upper end of the air spring 3 is disposed in the limiting groove 202, so as to further enhance the stable fit between the air spring 3 and the sealing cover 2, and further facilitate the fit between the air spring 3 and the sealing cover 2.

As a preferred embodiment of the present embodiment, it should be further described that the inner diameter of the limiting groove 202 is larger than the diameter of the upper end of the air spring 3, when the air spring 3 is compressed under force, the air spring may be accumulated in the limiting groove 202, and the inner diameter of the limiting groove 202 is larger than the diameter of the upper end of the air spring 3, so that the compression change of the air spring 3 may be smoother.

Embodiment two:

as shown in fig. 5, the utility model provides a battery cover plate, which comprises a battery cover plate body 5, wherein a pressure release valve mounting hole is formed in the battery cover plate body 5, the battery pressure release valve according to any one of the embodiments is mounted in the pressure release valve mounting hole, and the battery cover plate body 5 is combined with the battery pressure release valve, so that pressure release of a battery is more natural and stable, and safe use of the battery is ensured.

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 battery pressure release valve is characterized by comprising a shell (1), a sealing cover (2) and an air spring (3), wherein a central through hole penetrating through the upper end and the lower end of the shell (1) is formed in the middle of the shell (1), an annular limiting table (101) is arranged on the inner wall of the central through hole corresponding to the lower end of the shell (1), and at least two exhaust grooves (102) penetrating through the upper end of the shell (1) are formed in the inner wall of the central through hole above the annular limiting table (101); the sealing cover (2) is connected with the upper end of the shell (1) in a sealing way, and at least two pressure relief holes (201) which are in one-to-one correspondence with the exhaust grooves (102) are formed in the sealing cover (2); the air spring (3) is arranged in the central through hole, the lower end of the air spring (3) is in sealing contact with the annular limiting table (101), and the upper end of the air spring (3) is in contact with the sealing cover (2).

2. The battery pressure relief valve according to claim 1, characterized in that the lower end of the air spring (3) is connected with a sealing ring (4) in a matched mode, and the sealing ring (4) is abutted to the annular limiting table (101).

3. The battery pressure release valve according to claim 2, wherein an annular inner groove (401) is formed in the inner wall of the sealing ring (4), and the lower end of the air spring (3) is clamped in the annular inner groove (401) in a matching manner.

4. A battery pressure release valve according to claim 2 or 3, characterized in that the air spring (3) comprises a base (301) and an air bag (302) with compressed air inside, the air bag (302) being arranged at the upper end of the base (301); the lower end of the bottom support (301) is connected with the sealing ring (4) in a matching way, and the upper end of the air bag (302) is abutted against the sealing cover (2).

5. A battery pressure relief valve according to claim 2 or 3, characterized in that the sealing ring (4) is made of neoprene, the sealing ring (4) being in an interference fit with the inner wall of the central through hole.

6. The battery pressure relief valve according to claim 1, wherein the lower end of the sealing cover (2) is provided with a limit groove (202), and the upper end of the air spring (3) is arranged in the limit groove (202).

7. The battery pressure relief valve according to claim 6, wherein the inner diameter of the limit groove (202) is larger than the diameter of the upper end of the air spring (3).

8. A battery cover plate, which is characterized by comprising a battery cover plate body (5), wherein a pressure release valve mounting hole is formed in the battery cover plate body (5), and the battery pressure release valve according to any one of claims 1-7 is mounted in the pressure release valve mounting hole.