CN219553718U

CN219553718U - Explosion-proof safety valve of lithium battery

Info

Publication number: CN219553718U
Application number: CN202320472440.1U
Authority: CN
Inventors: 刘露; 孟佳东; 赵志刚
Original assignee: Lanzhou Jiaotong University
Current assignee: Lanzhou Jiaotong University
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-08-18
Anticipated expiration: 2033-03-14

Abstract

The utility model discloses an explosion-proof safety valve for a lithium battery, which relates to the technical field of lithium batteries and specifically comprises a pressure relief body and a debris interception net, wherein the bottom of the pressure relief body is fixedly connected with the debris interception net, the middle part of the top of the pressure relief body is provided with a reminding structure, the middle part of one side of the pressure relief body is provided with a power cavity, the other side of the pressure relief body is provided with a gas exhaust cavity, the top of the gas exhaust cavity is connected with a self-sealing plate, the top of the inner cavity of the gas exhaust cavity is fixedly connected with a pressure relief film, and the bottom of the power cavity is connected with the bottom of the gas exhaust cavity through a connecting groove. Through the arrangement of the scrap interception net, scraps generated when the pressure release film is damaged can be intercepted, and the scraps are prevented from entering the lithium battery, so that the use of the lithium battery is prevented from being influenced; through the setting of pjncture needle one and pjncture needle two, remind film and pressure release film can damage simultaneously, the staff judges the integrity of pressure release film through reminding the film, and then can judge whether the pressure release phenomenon has appeared in the lithium cell.

Description

Explosion-proof safety valve of lithium battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to an explosion-proof safety valve of a lithium battery.

Background

Lithium batteries are increasingly used as a driving power source for small portable devices such as notebook computers and mobile phones as sealed rechargeable batteries having high energy density, and their demands are increasing. When the battery is affected by abnormal factors such as short circuit, high heat, overcharge, etc., high-pressure gas is easily generated inside the battery, which may cause deformation of the battery case or even explosion. In order to enable safe use, an explosion-proof structure must be assembled in the battery.

Through retrieving, among the prior art, the patent of authorizing of application number CN202121663029.X has proposed an explosion-proof lithium cell, and the explosion-proof structure that discloses in this patent includes from supreme fastener, rupture membrane and the gasket that sets gradually down, the fastener is including interior round surface, transition inverted cone and the outer round surface that connect gradually, first explosion-proof hole has been seted up on the interior round surface, the rupture membrane bond in the upper surface of outer round surface, the gasket set up in the upper surface of rupture membrane, second explosion-proof hole has been seted up on the gasket, the second explosion-proof hole at least partially with first explosion-proof hole coincides in vertical direction.

Because the above-mentioned scheme is when using, unnecessary gas in the lithium cell needs to break the rupture membrane and just can discharge, and after the rupture membrane is broken, the battery is inside can be through the explosion-proof component intercommunication with the external world, the liquid in the battery is inside can appear revealing easily, consequently the lithium cell after the pressure release can have certain danger if continue to use, and the explosion-proof component in this scheme is when the pressure release and after the pressure release all do not have any warning work, the user can't judge from the outside of explosion-proof component whether the pressure release condition appears in the lithium cell, and the minimum pressure that receives when the rupture of explosion-proof film is certain, can't carry out the adjustment of adaptability, based on this, still be in sealing state after the pressure release and have the lithium cell explosion-proof relief valve of pressure release warning function is very necessary.

Disclosure of Invention

The utility model provides an explosion-proof safety valve for a lithium battery, which solves the problem that the interior of the lithium battery is communicated with the outside after the explosion-proof component of the lithium battery is decompressed; without the pressure release reminding function, staff cannot intuitively know whether the lithium battery is subjected to pressure release or not; the lowest pressure to which the explosion-proof film is damaged is fixed, and the staff can not adjust the explosion-proof film adaptively.

The utility model provides the following technical scheme: the lithium battery explosion-proof safety valve is characterized in that a self-sealing plate is fixed on the outer side of an air outlet end of the explosion-proof safety valve by a spring, when the lithium battery is exhausted, the self-sealing plate moves upwards under the impact of gas, the self-sealing plate is separated from the air outlet end of the explosion-proof safety valve, and after the lithium battery is exhausted, the self-sealing plate is reset by the resilience force of the spring, and the air outlet end of the explosion-proof safety valve is closed; the top of the explosion-proof safety valve is provided with a reminding film for reminding, and when the gas is exhausted, the reminding film and the explosion-proof film are broken at the same time, and a worker judges the integrity of the explosion-proof film according to the integrity of the reminding film; the puncture needle for puncturing the reminding film and the explosion-proof film is arranged, and the moving length of the puncture needle is adjusted according to the pressure release amount of the lithium battery, so that the adaptability of the puncture needle is improved.

The utility model provides an explosion-proof relief valve of lithium cell, includes pressure release body and piece interception net, the bottom fixedly connected with piece interception net of pressure release body, the middle part at pressure release body top is equipped with reminds the structure, the middle part of pressure release body one side is equipped with the power chamber, the top fixedly connected with spacing ring in power chamber inner chamber, the bottom swing joint in power chamber inner chamber has the fly leaf, the fly leaf passes through stay cord and faller and is connected with pressure release body, the opposite side of pressure release body is equipped with the exhaust chamber, the top of exhaust chamber is connected with from the closing plate through spring two and locating lever, the top fixedly connected with pressure release film in exhaust chamber inner chamber, the bottom in power chamber and the bottom in exhaust chamber pass through the spread groove and connect, the top fixedly connected with flexible pipe in spread groove inner chamber, the bottom fixedly connected with connecting rod in flexible pipe, the top fixedly connected with pjncture needle in the middle part of connecting rod middle part, the one end and the fly leaf of connecting rod are connected with, the other end fixedly connected with pjncture needle two;

the reminding structure comprises a protective cover fixedly connected with the middle part of the top of the pressure relief body, a reminding film is fixedly connected with the bottom end of the inner cavity of the protective cover, and the first puncture needle is positioned below the reminding film.

Preferably, the middle part fixedly connected with stay cord at movable plate top, the other end of stay cord runs through the top of power chamber and extends to the outside of power chamber, just the middle part of stay cord one side is equipped with the scale mark.

Preferably, the top fixedly connected with fixed plate of power chamber, one side of fixed plate is through the faller of first fixedly connected with of spring and fixed plate adaptation, the stay cord is fixed with the fixed plate through the faller, just the middle part of faller is equipped with the empty slot.

Preferably, the pressure release film is located the top of spread groove, pjncture needle two is located the below at pressure release film middle part, just the distance between pjncture needle two's top and the pressure release film bottom is the same with the distance between pjncture needle one's top and the warning film bottom.

Preferably, the middle part of pressure release body top both sides all is equipped with the spring groove, and the intracavity fixedly connected with spring second of spring groove, the top of spring second and the bottom fixed connection of self-sealing board, the middle part swing joint of spring second has the locating lever, the top and the self-sealing board fixed connection of locating lever, the surface parcel from the closing plate has the sealing fin.

Preferably, the protective cover is made of transparent materials.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the lithium battery explosion-proof safety valve, through the arrangement of the scrap interception net, scraps generated when the pressure release film is damaged can be intercepted, and the scraps are prevented from entering the lithium battery, so that the use of the lithium battery is influenced; through the setting of pjncture needle one and pjncture needle two, remind film and pressure release film can damage simultaneously, the staff judges the integrity of pressure release film through reminding the film, and then can judge whether the pressure release phenomenon has appeared in the lithium cell.

2. According to the lithium battery explosion-proof safety valve, through the arrangement of the movable plate and the pull rope, a worker can select the moving distance of the movable plate in the power cavity according to requirements, so that the safety valve can adapt to various pressure relief pressures, and the practicability of the safety valve is improved; through the arrangement of the self-sealing plate, the air outlet end of the safety valve can be in a sealing state, and the lithium battery can be conveniently used.

Drawings

FIG. 1 is a schematic diagram of the front of the structure of the present utility model;

FIG. 2 is a schematic view of the bottom of the pressure relief body of the present utility model;

FIG. 3 is a schematic cross-sectional view of the structure of the present utility model in FIG. 2;

FIG. 4 is an exploded view of FIG. 3, which is a block diagram of the present utility model;

fig. 5 is a schematic diagram of the pressure relief body of the structure of the present utility model.

In the figure: 1. a pressure relief body; 2. a debris intercepting net; 3. a needle plate; 4. a pull rope; 5. a protective cover; 6. self-sealing plate; 7. a power cavity; 8. an exhaust chamber; 9. a moving plate; 10. a telescopic tube; 11. a connecting rod; 12. a second puncture needle; 13. a pressure release film; 14. a reminding film; 15. a first puncture needle; 16. a limiting ring; 17. a fixing plate; 18. a second spring; 19. a first spring; 20. a positioning rod; 21. and a connecting groove.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides an explosion-proof safety valve for a lithium battery, which comprises a pressure release body 1 and a scrap interception net 2, wherein the scrap interception net 2 is positioned at the bottom of the pressure release body 1, and when the explosion-proof safety valve for the lithium battery is used, the scrap interception net 2 can intercept scraps possibly occurring in the pressure release body 1, so that the scraps are prevented from entering the lithium battery, and the work of the lithium battery is influenced.

The middle part at the top of the pressure relief body 1 is provided with a reminding structure, the reminding structure comprises a protective cover 5 fixedly connected with the middle part at the top of the pressure relief body 1, the bottom end fixedly connected with of the inner cavity of the protective cover 5 reminds the film 14, and the protective cover 5 is made of transparent materials, such as transparent plastics, workers can visually see the integrity of the reminding film 14 through the protective cover 5, the outer surface of the reminding film 14 can be coated with some conspicuous colors, and the reminding film 14 can be visually seen by the workers.

The middle part at pressure release body 1 top is equipped with the cylinder hole, and the inner chamber in cylinder hole communicates with the inner chamber of reminding the structure, and the intracavity swing joint in cylinder hole has pjncture needle one 15, and pjncture needle one 15 can remove the inner chamber of protection casing 5 under the effect of external force, and pjncture needle one 15 can puncture and remind film 14.

The middle part of pressure release body 1 one side is equipped with power chamber 7, and the top fixedly connected with spacing ring 16 of power chamber 7 inner chamber, the bottom swing joint of power chamber 7 inner chamber has movable plate 9, and the middle part fixedly connected with stay cord 4 at movable plate 9 top, the other end of stay cord 4 runs through the top of power chamber 7 and extends to the outside of power chamber 7, the top swing joint of stay cord 4 and power chamber 7.

The top fixedly connected with fixed plate 17 of power chamber 7, one side at fixed plate 17 top is equipped with the spring groove, and the bottom fixedly connected with spring one 19 of this spring groove inner chamber, the top fixedly connected with faller 3 of spring one 19, faller 3 can insert in the fixed plate 17, and faller 3 can pierce through stay cord 4.

As is clear from the above description, the worker can fix the pulling rope 4 to the fixed plate 17 by using the needle plate 3, and change the contact position of the pulling rope 4 and the fixed plate 17, so that the distance between the movable plate 9 and the limit ring 16 can be changed.

The middle part of the other side of the pressure relief body 1 is provided with a pressure relief cavity 8, the top end of the inner cavity of the pressure relief cavity 8 is fixedly connected with a pressure relief film 13, the top of the inner cavity of the pressure relief cavity 8 is provided with a self-sealing plate 6, and the outer surface of the self-sealing plate 6 is fixedly connected with a sealing piece so as to increase the tightness between the pressure relief cavity 8 and the self-sealing plate 6.

The both sides at the middle part at the top of the pressure release body 1 all are equipped with the spring groove, the bottom fixedly connected with spring two 18 in this spring groove inner chamber, the top of spring two 18 and the bottom fixed connection of self sealss board 6, the middle part swing joint of spring two 18 has locating lever 20, the top and the self sealss board 6 fixed connection of locating lever 20, through the setting of spring two 18 and locating lever 20, under the effect of gas pressure, self sealss board 6 can shift up, unnecessary gas in the lithium cell is discharged through the clearance between exhaust chamber 8 and the self sealss board 6, after the lithium cell is exhausted, self sealss board 6 resets under the effect of spring two 18 resilience, make the top of self sealss board 6 closely laminate with the top of exhaust chamber 8, prevent external and the inside intercommunication of lithium cell, the leakproofness of lithium cell has been guaranteed.

The bottom of power chamber 7 and the bottom of exhaust chamber 8 are connected through spread groove 21, the top fixedly connected with flexible pipe 10 of spread groove inner chamber, the bottom fixedly connected with connecting rod 11 of flexible pipe 10, the bottom of pjncture needle one 15 and the middle part fixed connection at connecting rod 11 top, the one end that connecting rod 11 is located power chamber 7 and movable plate 9 fixed connection, the one end fixedly connected with pjncture needle two 12 that connecting rod 11 is located exhaust chamber 8, pressure release film 13 is located the top of spread groove 21, pjncture needle two 12 are located the below at pressure release film 13 middle part, and the distance between pjncture needle two 12's top and pressure release film 13 bottom is the same with the distance between pjncture needle one 15's top and the warning film 14 bottom, pjncture needle two 12 can puncture pressure release film 13.

As is apparent from the above description, the telescopic tube 10 is used to seal the space above the moving plate 9, and the explosion-proof safety valve can generate a pressure difference on both sides of the moving plate 9 when in use, and the moving plate 9 can move upwards under the action of the gas pressure in the lithium battery.

The arrangement of the puncture needle I15 and the puncture needle II 12 enables the pressure release film 13 and the reminding film 14 to be broken at the same time, gas in the lithium battery is discharged through the exhaust cavity 8, and staff can judge whether the pressure release condition of the lithium battery occurs through the reminding film 14.

In summary, the working principle of the explosion-proof safety valve is as follows: the redundant gas in the lithium battery is utilized to push the movable plate 9 to move upwards, and the pressure release film 13 is punctured when the movable plate 9 moves upwards, so that the redundant gas in the lithium battery can be discharged through the exhaust cavity 8.

In the process of upward movement of the movable plate 9, the gas in the lithium battery overcomes the gravity of the movable plate 9 to do work, when the pressure relief pressure in the lithium battery is different, the upward movement position of the movable plate 9 is also different, and the upward movement distance of the movable plate 9 is in direct proportion to the pressure relief pressure, therefore, the middle part of one side of the pull rope 4 is provided with scales, the relationship between the movement distance of the movable plate 9 and the pressure relief pressure can be obtained by a person skilled in the art through limited experiments, and the staff can judge the minimum chip relief pressure suitable for the safety valve through the scales on the pull rope 4.

To sum up: when the lithium battery explosion-proof safety valve is used, a worker adjusts the contact position of the pull rope 4 and the fixed plate 17 according to the requirement, so that the position of the movable plate 9 in the power cavity is suitable.

When the gas in the lithium battery needs to be discharged, redundant gas in the lithium battery can extrude the movable plate 9, so that the movable plate 9 moves upwards until the movable plate 9 is in contact with the limiting ring 16, at the moment, the movable plate 9 drives the puncture needle I15 and the puncture needle II 12 to move through the connecting rod 11, the puncture needle I15 can puncture the reminding film 14, the puncture needle II 12 can puncture the pressure release film 13, the reminding film 14 and the pressure release film 13 are simultaneously punctured, redundant gas in the lithium battery can extrude the self-sealing plate 6, the self-sealing plate 6 moves upwards under the action of the pressure, redundant gas in the lithium battery is discharged from the exhaust cavity 8, and the explosion-proof safety valve realizes the pressure release function.

After the lithium battery is decompressed, the self-sealing plate 6 resets under the action of the resilience force of the second spring 18, the self-sealing plate 6 plugs the exhaust cavity 8, and the tightness in the lithium battery is ensured.

Standard parts used in the present utility model can be purchased from the market, the special-shaped parts can be customized according to the descriptions of the specification and the drawings, the specific connection modes of the parts are conventional means such as bolts, rivets, welding and the like which are mature in the prior art, and the machines, the parts and the equipment are conventional models in the prior art, so that details which are not described in detail in the specification belong to the prior art which is well known to the person skilled in the art, and although the embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principle and spirit of the present utility model, and the scope of the present utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an explosion-proof relief valve of lithium cell, includes pressure release body (1) and piece interception net (2), its characterized in that: the bottom of the pressure relief body (1) is fixedly connected with a debris interception net (2), the middle part of the top of the pressure relief body (1) is provided with a reminding structure, the middle part of one side of the pressure relief body (1) is provided with a power cavity (7), the top end of the inner cavity of the power cavity (7) is fixedly connected with a limiting ring (16), the bottom end of the inner cavity of the power cavity (7) is movably connected with a movable plate (9), the movable plate (9) is connected with the pressure relief body (1) through a pull rope (4) and a needle plate (3), the other side of the pressure relief body (1) is provided with a vent cavity (8), the top of the vent cavity (8) is connected with a self-sealing plate (6) through a spring II (18) and a positioning rod (20), the top of the inner cavity of the exhaust cavity (8) is fixedly connected with a pressure release film (13), the bottom of the power cavity (7) and the bottom of the exhaust cavity (8) are connected through a connecting groove (21), the top of the inner cavity of the connecting groove is fixedly connected with a telescopic pipe (10), the bottom of the telescopic pipe (10) is fixedly connected with a connecting rod (11), the top of the middle part of the connecting rod (11) is fixedly connected with a first puncture needle (15), the first puncture needle (15) is movably connected with the middle part of the pressure release body (1), one end of the connecting rod (11) is connected with a movable plate (9), the other end of the connecting rod (11) is fixedly connected with a puncture needle II (12);

the reminding structure comprises a protective cover (5) fixedly connected with the middle part of the top of the pressure relief body (1), a reminding film (14) is fixedly connected with the bottom end of the inner cavity of the protective cover (5), and a first puncture needle (15) is positioned below the reminding film (14).

2. The explosion-proof safety valve for lithium battery according to claim 1, wherein: the middle part fixedly connected with stay cord (4) at movable plate (9) top, the other end of stay cord (4) runs through the top of power chamber (7) and extends to the outside of power chamber (7), just the middle part of stay cord (4) one side is equipped with the scale mark.

3. The explosion-proof safety valve for lithium battery according to claim 2, wherein: the top fixedly connected with fixed plate (17) of power chamber (7), one side of fixed plate (17) is through first spring (19) fixedly connected with faller (3) with fixed plate (17) adaptation, stay cord (4) are fixed with fixed plate (17) through faller (3), just the middle part of faller (3) is equipped with the empty slot.

4. The explosion-proof safety valve for lithium battery according to claim 1, wherein: the pressure release film (13) is located the top of spread groove (21), pjncture needle two (12) are located the below at pressure release film (13) middle part, just the distance between pjncture needle two (12) top and pressure release film (13) bottom is the same with the distance between pjncture needle one (15) top and warning film (14) bottom.

5. The explosion-proof safety valve for lithium battery according to claim 1, wherein: the middle part of pressure release body (1) top both sides all is equipped with the spring groove, and the intracavity fixedly connected with spring two (18) in spring groove, the top of spring two (18) and the bottom fixed connection of self-sealing board (6), the middle part swing joint of spring two (18) has locating lever (20), the top and the self-sealing board (6) fixed connection of locating lever (20), the surface parcel of self-sealing board (6) has the sealing washer.

6. The explosion-proof safety valve for lithium battery according to claim 1, wherein: the protective cover (5) is made of transparent materials.