CN219017850U

CN219017850U - Metal-case battery safety valve structure

Info

Publication number: CN219017850U
Application number: CN202222908504.6U
Authority: CN
Inventors: 陈相档; 王盈来; 郭锋; 黄文�; 徐留扣; 李艳红; 蒋勤虚; 方玲; 曹华燕; 温舒婷
Original assignee: Zhejiang Narada Power Source Co Ltd; Hangzhou Nandu Power Technology Co Ltd
Current assignee: Zhejiang Narada Power Source Co Ltd; Hangzhou Nandu Power Technology Co Ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-05-12
Anticipated expiration: 2032-10-31

Abstract

The utility model discloses a metal shell battery safety valve structure, which aims to solve the defect that the whole metal shell upper cover is scrapped along with the explosion-proof valve of the existing metal shell battery due to damage under the test or collision condition in the production process. The utility model comprises a pressing block fixedly connected to the top cover of a metal shell battery, wherein the pressing block is covered on an explosion-proof valve of the top cover, the pressing block is provided with a groove cavity, the top cover is attached to the open surface of the groove cavity, the pressing block is provided with a pressure relief hole communicated with the groove cavity, the inner wall surface of the pressing block is fixedly connected with a valve plate, the outer wall surface of the pressing block is provided with a diaphragm, the valve plate and the diaphragm are respectively sealed at two ends of the pressure relief hole, and the valve plate is broken under preset pressure to enable the inside of the battery to be communicated with atmospheric pressure. Through covering this relief valve to explosion-proof valve failure cell or top cap subassembly, can avoid the electric core or top cap subassembly to scrap badly because of the relief valve damage leads to, reduce the material extravagant.

Description

Metal-case battery safety valve structure

Technical Field

The utility model relates to the field of energy storage, in particular to a metal shell battery safety valve structure.

Background

The explosion-proof valve is an important component in the top cover component of the metal shell battery, and the valve plate of the explosion-proof valve is connected to the top cover component through laser welding. When a large amount of gas is generated in the metal shell battery and the air pressure reaches the valve opening pressure, the explosion-proof valve opens the valve to release the pressure, thereby playing a role in safety protection.

The metal shell battery safety valve is opened after relevant safety tests or is knocked in the manufacturing process of the metal shell battery, and the original explosion-proof valve on the metal shell battery top cover assembly can be damaged by accidentally opening the valve, so that the metal shell battery top cover assembly and even the whole metal shell battery are scrapped.

This can result in considerable waste. The application aims at providing a metal shell battery safety valve structure aiming at the failure condition of an explosion-proof valve caused by test and collision in the production and test process, and the safety valve is welded and fixed to cover an original valve body, so that the scrapping defect is avoided.

Chinese patent publication No. CN215008494U, the name is explosion-proof valve structure of secondary lithium cell top cap, and this application discloses explosion-proof valve structure of secondary lithium cell top cap, including lamina tecti, insulating support, protection casing, first mounting and second mounting, the explosion-proof valve bleeder vent has been seted up at the middle part of lamina tecti, just the internally mounted of explosion-proof valve bleeder vent has the explosion-proof valve, the bottom at the explosion-proof valve bleeder vent is fixed through laser spot welding to the explosion-proof valve, the insulating support passes through the reference column and installs the bottom at the lamina tecti, the inboard injection moulding of first mounting has the first fixed bolster that is the V type, first buckle cooperatees with the back taper hole that sets up on the lamina tecti. After the explosion-proof valve is damaged accidentally, the top cover assembly or the battery of the scheme needs to be scrapped, and the yield is affected.

Disclosure of Invention

The utility model overcomes the defect that the whole metal shell upper cover is scrapped along with the metal shell upper cover due to damage under the test or collision condition in the production process of the conventional explosion-proof valve of the metal shell battery, and provides the metal shell battery safety valve structure.

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

the utility model provides a metal-case battery relief valve structure, includes the briquetting of fixed connection on metal-case battery top cap, and the briquetting lid is adorned on the explosion-proof valve of top cap, and the briquetting is equipped with the cell chamber, and the open face in cell chamber is laminated to the top cap, is equipped with the pressure release hole in intercommunication cell chamber on the briquetting, fixedly connected with valve block on the briquetting, and the valve block seals the pressure release hole, and the valve block is damaged under the presupposeing pressure and is made inside the battery and communicate with the atmospheric pressure.

The slot cavity is sealed by the top cover to form a sealed cavity. The closed cavity is used for accommodating the part, outside the top cover, of the original explosion-proof valve which is driven to deform by the change of the air pressure in the battery, so that the smoothness of the air outlet air channel is kept. The valve plate is provided with a notch, and the notch breaks under preset air pressure to form an air outlet passage. The air outlet air passage comprises an explosion-proof valve on the top cover as an air inlet hole, a cavity formed by the groove cavity as an air passage and a pressure relief hole as an air outlet hole. The diaphragm has lower strength and is only used for keeping the tightness of the groove cavity, so that the influence of electrolyte flowing onto the valve plate in the process of adding liquid on the valve plate is avoided. Through the structure, the safety valve with the function similar to that of the explosion-proof valve is newly arranged outside the explosion-proof valve, and the failure top cover and the battery of the explosion-proof valve which are originally expected to be used as waste products are saved. The waste of the materials is reduced, and the yield of the product is improved.

Preferably, the pressing block further comprises a diaphragm arranged on the outer wall surface of the pressing block, the diaphragm is stuck to the pressure relief hole, and the valve plate and the diaphragm are respectively sealed at two ends of the pressure relief hole. The diaphragm protects the valve plate from erosion and prolongs the service life of the valve plate.

Preferably, the cover plate is provided with a pole, and the height of the pressing block is smaller than the distance from the top of the pole to the surface of the cover plate along the axial direction of the pole. The structure enables the externally hung safety valve structure to have better compatibility.

Preferably, the pressing block is further covered on the liquid injection hole of the top cover. The liquid injection hole is also communicated with the cavity formed by the groove cavity.

Preferably, a sealing element is arranged between the pressing block and the top cover. The sealing member has improved sealing performance, avoids the external world to enter into inside the battery through the clearance between briquetting and the top cap.

Preferably, the inner wall of the pressing block extends out of the top cover to form a sealing strip, and the sealing strip positions the sealing piece. The sealing piece is positioned through the sealing strip by the structure, so that the sealing piece is compressed between the pressing block and the top cover, and the sealing effect is prevented from being loosened and losing.

Preferably, the cross section of the sealing member is U-shaped, the sealing member is provided with an insertion opening, and the sealing strip is inserted into the insertion opening and is tightly matched with the sealing member. The sealing strip carries out press fitting and three-direction friction on the sealing element, so that the position of the sealing element is limited, and the sealing element is ensured not to be out of position.

Preferably, a sealing cavity is enclosed between the outer edges of the sealing strip and the pressing block and between the top cover, and the sealing piece is tightly attached to the inner wall surface of the sealing cavity. The structure provides another feasible sealing and positioning scheme, and ensures that the sealing element is not out of position.

Preferably, the projection of the pressure relief hole and the projection of the explosion-proof valve overlap at least partially on a plane perpendicular to the direction of the top cover method. The structure further reduces the pressure release resistance, improves the pressure release speed and reduces the risk of battery explosion.

Preferably, one end of the pressing block, which is close to the top cover, extends outwards to form a welding step edge, and the welding step edge is fixedly connected with the top cover. And welding the top surface of the welding step edge to fix the pressing block and the top cover in a welding way.

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

(1) For the battery top cover which is completely installed with the explosion-proof valve or even the battery which is completely installed with the battery cell, the battery which is failed by the explosion-proof valve can only be subjected to waste treatment, and the battery top cover and the battery can still be effective on the premise of not losing compatibility by installing the safety valve, so that the yield of products is effectively improved;

(2) In the liquid injection process, electrolyte can flow on the light plate of the top cover, and the existing explosion-proof valve flush with the top cover is easy to erode by the electrolyte to fail;

(3) The original explosion-proof valve can be prevented from being expanded and extruded by the battery core, and the explosion-proof function is prevented from being influenced.

Drawings

FIG. 1 is a front view of the present utility model;

FIG. 2 is an exploded view of the present utility model;

FIG. 3 is a cross-sectional view of an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of another embodiment of the present utility model;

FIG. 5 is an enlarged view of a portion of an embodiment of the present utility model;

FIG. 6 is an enlarged view of a portion of another embodiment of the present utility model;

in the figure:

the explosion-proof valve comprises a pressing block 1, a top cover 2, an explosion-proof valve 3, a groove cavity 4, a pressure relief hole 5, a valve plate 6, a diaphragm 7, a pole 8, a liquid injection hole 9, a sealing piece 10, a sealing strip 11 and a welding step edge 12.

Detailed Description

The disclosure is further described below with reference to the drawings and examples.

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Examples:

the utility model provides a metal-case battery relief valve structure, as shown in fig. 2, 3, includes briquetting 1 on metal-case battery top cap 2 of fixed connection, briquetting 1 lid dress is on explosion-proof valve 3 of top cap 2, and briquetting 1 is equipped with slot chamber 4, and top cap 2 laminating slot chamber 4's open face. With briquetting 1 residing above top cap 2 as the referential nature, cell chamber 4 is located the bottom of briquetting 1, and the opening of cell chamber 4 is towards top cap 2, on briquetting 1 fixed connection top cap 2's basis, cell chamber 4 receives the closure of top cap 2 to form a confined cavity, the through-hole that explosion-proof valve 3 produced is located in the cavity completely, makes the inside space of battery communicate with the cavity and not with atmospheric pressure intercommunication. On this basis, be equipped with pressure release hole 5 of intercommunication cell chamber 4 on the briquetting 1, the internal face fixedly connected with valve block 6 of briquetting 1, the outer wall face of briquetting 1 is pasted and is had diaphragm 7, and valve block 6 and diaphragm 7 seal respectively at pressure release hole 5's pore both ends. The valve plate 6 is provided with a notch with proper depth, and the valve plate 6 is broken under preset pressure to enable the inside of the battery to be communicated with atmospheric pressure. The valve plate 6 is fixedly connected with the pressing block 1 at the outer edge by adopting a laser welding mode. The diaphragm 7 is connected with the pressing block 1 in a bonding mode, and the pressure or the pressure required by the damage is smaller than the force required by the damage of the valve plate 6. The top cover is in the shape of a circle center or a rectangle or other shapes, and the opening of the groove cavity is in the shape of a circle center or a rectangle or other shapes.

As shown in fig. 1, the cover plate is provided with a pole 8, and the height of the pressing block 1 is smaller than the distance from the top of the pole 8 to the surface of the cover plate along the axial direction of the pole 8. The structure enables the externally hung safety valve structure to have better compatibility.

In some embodiments, the projection of the pressure relief vent and the projection of the explosion proof valve at least partially coincide in a plane perpendicular to the normal direction of the top cover.

As shown in fig. 4, in some embodiments, the compact 1 is also capped on the liquid injection hole 9 of the top cover 2. The filling hole 9 is also connected to the chamber formed by the tank chamber 4. The chamber corresponding to the pressing block 1 is communicated with the hole corresponding to the explosion-proof valve 3 and the liquid injection hole 9 on the basis of being not communicated with the external atmospheric pressure.

The tank cavity 4 is closed by the top cover 2 to form a closed cavity. The closed cavity is used for accommodating the part, outside the top cover 2, of the original explosion-proof valve 3, which is driven to deform by the change of the air pressure in the battery, so that the smoothness of an air outlet channel is kept. The valve plate 6 is provided with a notch, and is broken under preset air pressure to form an air outlet passage. The air outlet air passage comprises an explosion-proof valve 3 on the top cover 2 as an air inlet hole, a cavity formed by the groove cavity 4 as an air passage, and a pressure relief hole 5 as an air outlet hole. Wherein the strength of the diaphragm 7 is lower, and the diaphragm is only used for keeping the tightness of the groove cavity 4, so that the influence of electrolyte flowing onto the valve plate 6 in the process of adding liquid on the performance of the valve plate 6 is avoided. Through the structure, the safety valve with the function similar to that of the explosion-proof valve 3 is newly arranged outside the explosion-proof valve 3, so that the failure top cover 2 and the battery of the explosion-proof valve 3 originally expected to be used as waste products are saved. The waste of the materials is reduced, and the yield of the product is improved.

As shown in fig. 5 and 6, the shut-off of the chamber from the outside atmosphere is ensured by: a sealing element 10 is arranged between the pressing block 1 and the top cover 2. The sealing member 10 improves sealing performance, and prevents the outside from entering the inside of the battery through the gap between the pressing block 1 and the top cover 2. The seal 10 is an O-ring in some embodiments. The inner wall of the pressing block 1 extends out of the top cover 2 to form a sealing strip 11, and the sealing strip 11 positions the sealing element 10. The sealing element 10 is positioned through the sealing strip 11, so that the sealing element 10 is compressed between the pressing block 1 and the top cover 2, and the sealing element 10 is prevented from loosening and losing the sealing effect. In some embodiments, the seal 10 has a U-shaped cross section, the seal 10 being provided with an insertion opening, and the sealing strip 11 being inserted in the insertion opening and being in close fit with the seal 10. The sealing strip 11 presses the sealing element 10 and rubs in three directions, so that the position of the sealing element 10 is limited, and the sealing element 10 is ensured not to be out of position. In other embodiments, the seal is a seal ring. The sealing strip 11 and the outer edge of the pressing block 1 and the top cover 2 enclose a sealing cavity, and the sealing piece 10 is tightly attached to the inner wall surface of the sealing cavity. The above arrangement provides another possible seal positioning scheme, ensuring that the seal 10 is not out of position.

As shown in fig. 5 and 6, the form of the fixed connection of the press 1 and the metal top cover 2 is in some embodiments welding, in particular, laser welding. For matching with laser welding, one end of the pressing block 1, which is close to the top cover 2, is outwards extended to form a welding step edge 12, and the welding step edge 12 is fixedly connected with the top cover 2. The briquette 1 is welded to the top cover 2 by welding on the top surface of the welding step 12.

The above-described embodiments are merely preferred embodiments of the present utility model, and the present utility model is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.

Claims

1. The utility model provides a metal-case battery relief valve structure, characterized by, including fixed connection briquetting on metal-case battery top cap, the briquetting lid is adorned on the explosion-proof valve of top cap, and the briquetting is equipped with the cell chamber, and the open face in cell chamber is laminated to the top cap, is equipped with the pressure release hole in intercommunication cell chamber on the briquetting, fixedly connected with valve block on the briquetting, and the valve block seals the pressure release hole, and the valve block is damaged under the presupposeing pressure and is made battery inside and atmospheric pressure intercommunication.

2. The metal-case battery safety valve structure according to claim 1, wherein the pressing block further comprises a diaphragm arranged on the outer wall surface of the pressing block, the diaphragm is adhered to the pressure relief hole, and the valve plate and the diaphragm are respectively sealed at two ends of the pressure relief hole.

3. The metal-case battery safety valve structure according to claim 1, wherein the poles of the battery protrude from the top cover, and the height of the press block is smaller than the distance from the top of the poles to the surface of the cover plate.

4. The metal-case battery safety valve structure according to claim 1, wherein the pressing block is further covered on the liquid injection hole of the top cover.

5. The metal-case battery safety valve structure according to claim 1, wherein a sealing member is provided between the pressing block and the top cover.

6. The metal-case battery safety valve structure according to claim 5, wherein a sealing strip extends from the inner wall of the pressing block toward the top cover, and the sealing strip positions the sealing member.

7. The metal-case battery safety valve structure according to claim 6, wherein the sealing member has a U-shaped cross section, the sealing member is provided with an insertion opening, and the sealing strip is inserted into the insertion opening and is in tight fit with the sealing member.

8. The metal-case battery safety valve structure according to claim 6, wherein a sealing cavity is defined between the outer edges of the sealing strip and the pressing block and the top cover, and the sealing member is tightly fitted to the inner wall surface of the sealing cavity.

9. The metal-case battery safety valve structure according to claim 1, wherein the projection of the pressure relief hole and the projection of the explosion-proof valve at least partially overlap each other on a plane perpendicular to the normal direction of the top cover.

10. The metal-case battery safety valve structure according to any one of claims 1 to 9, wherein the pressing block has a welding step side formed to extend outward from one end thereof adjacent to the top cover, the welding step side being fixedly connected to the top cover.