CN216120622U

CN216120622U - Lithium battery exhaust safety valve

Info

Publication number: CN216120622U
Application number: CN202122515987.9U
Authority: CN
Inventors: 涂巧华; 高峰; 张要枫; 赵冬梅
Original assignee: Hubei Titanium Era New Energy Co Ltd
Current assignee: Hubei Titanium Era New Energy Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-03-22
Anticipated expiration: 2031-10-19

Abstract

A lithium battery exhaust safety valve comprises a valve body shell and a valve elastic sheet, wherein a supporting platform is arranged on the inner wall of the valve body shell, the valve elastic sheet is arranged inside the valve body shell, two ends of the valve elastic sheet are welded with the upper end face of the supporting platform, a buffer box is welded on the side wall of the supporting platform, a spring is arranged above the supporting platform, one end of the spring is connected with the supporting platform, the other end of the spring is connected with the inner wall of the valve body shell, and an exhaust port is formed in the valve body shell; the utility model can prevent the electrolyte in the lithium battery from seeping out in the exhaust process, and the device protects the exhaust valve and prolongs the service life of the lithium battery.

Description

Lithium battery exhaust safety valve

Technical Field

The utility model belongs to the technical field of lithium batteries, and particularly relates to an exhaust safety valve of a lithium battery.

Background

The lithium battery is a battery which uses lithium metal or lithium alloy as a positive/negative electrode material and uses a non-aqueous electrolyte solution, and is widely applied to various devices because of the advantages of safety, high efficiency, no pollution, high specific energy, abundant raw materials, multiple recycling times, long storage time and the like.

In general, when a lithium battery is in short circuit, overcharging, over-protection and the like in the use process, current is out of control, so that the temperature of the battery is increased, and substances such as electrolyte and the like in the battery are decomposed to generate gas when the temperature is increased to a certain height; as the pressure of the gas increases, the battery case may swell, deform, and in the severe case, may burst. Therefore, in the lithium ion battery using any material as the case, it is necessary to attach an exhaust safety valve to the mouth portion. The existing lithium battery exhaust safety valve generally has the following defects in the use process:

1. after gas is generated inside the lithium battery, the gas can push open a safety valve at the top of the battery to exhaust, electrolyte inside the battery often flows out along with the gas in the exhaust process, and the risk of ignition is also caused while the pollution is brought to the surrounding environment;

2. because the safety valve is frequently used, an internal transmission mechanism of the safety valve is easy to age and lose efficacy, so that external gas enters the battery when the battery exhausts, the internal resistance of the battery is increased, and the service life of the battery is influenced;

3. the safety valve is usually installed outside the battery and has no effective protection, and the safety valve is easily deformed and damaged by external influence.

Disclosure of Invention

In view of the technical problems in the background art, the utility model provides an exhaust safety valve for a lithium battery. The device, the device can prevent effectively that the lithium cell from oozing at its inside electrolyte of carminative in-process, and the device has also increased the life of lithium cell when having protected discharge valve.

In order to solve the technical problems, the utility model adopts the following technical scheme to realize:

the utility model provides a lithium cell relief valve that exhausts, includes valve body shell and valve shell fragment, and the inner wall department of valve body shell is equipped with supporting platform, and the inside of valve body shell is equipped with the valve shell fragment, the both ends of valve shell fragment and supporting platform's up end welding, and supporting platform's lateral wall department welding has the buffering box, and supporting platform's top is equipped with the spring, the one end and the supporting platform of spring are connected, and the other end and the interior wall connection of valve body shell of spring have seted up the gas vent on the valve body shell.

In a preferable scheme, the buffer box is provided with a groove, and the groove is used as a gas buffer chamber when working.

In the preferred scheme, the safety valve is arranged at the end part of the lithium battery, a cavity below the valve elastic sheet is communicated with the inside of the lithium battery, and a cavity above the valve elastic sheet is communicated with the exhaust port and serves as an exhaust chamber.

In the preferred scheme, the valve spring plate is provided with air holes, and the exhaust chamber is communicated with the groove through the air holes.

In the preferred scheme, a sealing gasket is arranged on the contact surface of the buffer box and the valve elastic sheet.

This patent can reach following beneficial effect:

1. the device can effectively prevent the electrolyte in the lithium battery from seeping out along with the lithium battery in the exhaust process through the design of the gas buffer chamber and the exhaust chamber, and also prevents external gas from entering the battery, thereby ensuring the performance of the battery;

2. this device can effectively protect the discharge valve of battery, prevents that it from receiving external force impact and acid-base corrosion, has promoted the whole life of battery.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic view of the overall structural installation of the present invention;

FIG. 2 is a sectional view of the exhaust valve structure according to the present invention;

FIG. 3 is a cross-sectional plan view of the exhaust valve of the present invention;

FIG. 4 is a schematic view of the vent chamber and buffer chamber of the present invention.

In the figure: the valve comprises a valve body shell 1, a supporting platform 2, a valve elastic sheet 3, a buffer box 4, air holes 5, a spring 6, an exhaust port 7, a groove 8, an exhaust chamber 9, a sealing washer 10 and a lithium battery 11.

Detailed Description

As shown in fig. 2 and 3, the lithium battery exhaust safety valve comprises a valve body shell 1 and a valve elastic sheet 3, wherein a supporting platform 2 is arranged on the inner wall of the valve body shell 1, the valve elastic sheet 3 is arranged inside the valve body shell 1, two ends of the valve elastic sheet 3 are welded with the upper end face of the supporting platform 2, a buffer box 4 is welded on the side wall of the supporting platform 2, a spring 6 is arranged above the supporting platform 2, one end of the spring 6 is connected with the supporting platform 2, the other end of the spring 6 is connected with the inner wall of the valve body shell 1, and an exhaust port 7 is formed in the valve body shell 1;

when the lithium battery 11 exhausts, the valve elastic sheet 3 deforms and arches upwards under the action of the air pressure in the battery, and the gas in the lithium battery 11 enters the buffer box 4, enters a cavity above the valve elastic sheet 3 from the buffer box 4 and is finally exhausted through the exhaust port 7;

after 11 exhaust of lithium cell, valve shell fragment 3 can the automatic recovery normal position and seal the battery under the combined action of self deformation stress, spring 6's elasticity and the inside negative pressure of lithium cell 11, has solved 11 exhaust of battery pressure release after and can not carry out effectual sealed problem to lithium cell 11 because of the ageing type of relief valve changes.

Preferably, as shown in fig. 4, the buffer box 4 is provided with a groove 8, and the groove 8 is used as a gas buffer chamber during operation. After the valve elastic sheet 3 bounces upwards, the gas in the lithium battery 11 can enter the buffer box 4, then the buffer box 4 exhausts the gas, and the buffer box 4 can avoid electrolyte leakage and other phenomena caused by too fast battery exhaust.

The preferred scheme is as shown in fig. 1 and fig. 2, the safety valve is arranged at the end part of the lithium battery 11, a cavity below the valve spring 3 is communicated with the inside of the lithium battery, a cavity above the valve spring 3 is communicated with the exhaust port 7 and serves as an exhaust chamber 9, and gas in the battery firstly enters the buffer chamber when exhausting, then enters the exhaust chamber 9 from the buffer chamber and finally is exhausted through the exhaust port 7; through the design of gas buffer chamber and exhaust chamber 9, can prevent effectively that its inside electrolyte of lithium cell at carminative in-process from oozing thereupon, also avoided inside external gas enters into the battery, guaranteed the performance of battery.

In a preferred scheme, as shown in fig. 2 and 3, the valve spring 3 is provided with a vent hole 5, and the vent hole 5 enables the exhaust chamber 9 and the groove 8 to be communicated with each other.

The preferred scheme is as shown in fig. 4, a sealing washer 10 is arranged at the contact surface of the buffer box 4 and the valve spring plate 3, the sealing washer 10 can ensure that the cavities above and below the valve spring plate 3 are not communicated with each other under the non-exhaust state of the lithium battery 11, and further the overall tightness of the lithium battery 11 is ensured.

The working principle of the device is as follows:

1. when the lithium battery 11 works, gas is generated inside, so that the internal air pressure of the battery is too high, the gas has upward thrust on the valve elastic piece 3, and the valve elastic piece 3 deforms and arches upwards under the action of the internal air pressure of the battery;

2. after the valve elastic sheet 3 is arched upwards, a cavity below the valve elastic sheet 3 is communicated with a buffer chamber on the buffer box 4, and gas in the battery enters the buffer chamber;

3. because the valve elastic sheet 3 is provided with the air holes 5, the air enters the exhaust chamber 9 through the air holes 5 and is finally exhausted through the exhaust port 7;

4. after the lithium battery 11 is exhausted, the valve elastic sheet 3 can automatically recover the original position under the combined action of the self deformation stress, the elasticity of the spring 6 and the negative pressure in the lithium battery 11; a sealing washer 10 is arranged on the contact surface of the buffer box 4 and the valve elastic sheet 3, so that the upper and lower chambers of the valve elastic sheet 3 are not communicated with each other.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.

Claims

1. The utility model provides a lithium cell relief valve that exhausts, includes valve body shell (1) and valve shell fragment (3), its characterized in that: the inner wall department of valve body shell (1) is equipped with supporting platform (2), and the inside of valve body shell (1) is equipped with valve shell fragment (3), the both ends of valve shell fragment (3) and the up end welding of supporting platform (2), the welding of lateral wall department of supporting platform (2) has buffer box (4), and the top of supporting platform (2) is equipped with spring (6), spring (6) one end is connected with supporting platform (2), and the other end and the interior wall connection of valve body shell (1) of spring (6), has seted up gas vent (7) on valve body shell (1).

2. The lithium battery vent safety valve of claim 1, wherein: the buffer box (4) is provided with a groove (8), and the groove (8) is used as a gas buffer chamber when in work.

3. The lithium battery vent safety valve of claim 1, wherein: the safety valve is integrally arranged at the end part of the lithium battery (11), a cavity below the valve elastic sheet (3) is communicated with the inside of the lithium battery, and a cavity above the valve elastic sheet (3) is communicated with the exhaust port (7) and serves as an exhaust chamber (9).

4. The lithium battery vent safety valve of claim 3, wherein: the valve spring (3) is provided with an air vent (5), and the exhaust chamber (9) is communicated with the groove (8) through the air vent (5).

5. The lithium battery vent safety valve of claim 1, wherein: and a sealing gasket (10) is arranged on the contact surface of the buffer box (4) and the valve elastic sheet (3).