CN219610662U

CN219610662U - Explosion-proof valve structure of lithium battery

Info

Publication number: CN219610662U
Application number: CN202320679926.2U
Authority: CN
Inventors: 贾丹
Original assignee: Guangdong Honghaosheng Energy Technology Co ltd
Current assignee: Guangdong Honghaosheng Energy Technology Co ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-08-29
Anticipated expiration: 2033-03-31

Abstract

The utility model discloses an explosion-proof valve structure of a lithium battery, which relates to the technical field of battery explosion-proof valves and comprises a top cover plate, wherein an explosion-proof component is arranged at the center of the surface of the top cover plate, a channel penetrating to the bottom end of the top cover plate is formed in the top end of the top cover plate, and two groups of ventilation grooves are formed in the inner wall of the channel; the explosion-proof assembly comprises a fixed ring fixed on the inner wall of the channel, a piston matched with the channel is arranged below the fixed ring, a plurality of groups of base rods are fixed at the top end of the piston, and a movable ring penetrates through the fixed ring and is fixed at the top end of the base rods. According to the utility model, the notch of the outer wall of the piston is communicated with the ventilation groove through lifting the piston, so that the pressure release purpose is achieved by discharging gas through the ventilation film, the piston is driven to continuously lift when the pressure in the lithium battery is overlarge, and then the pointed cone at the top end of the movable ring is supported to puncture the ventilation film, the obstruction to the gas in the battery is reduced, the efficient pressure release purpose is achieved, and the explosion condition of the lithium battery is further avoided.

Description

Explosion-proof valve structure of lithium battery

Technical Field

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

Background

The lithium battery is a novel environment-friendly energy storage component, has the advantages of good high-current discharge performance, high energy density, environment friendliness, high energy density, long service life and the like, and has wide application in the fields of automobile energy storage technology, hybrid electric vehicles, communication, household appliances, military industry, aerospace and the like. However, the lithium battery releases a large amount of gas and a large amount of heat upon overcharge or overdischarge or severe impact, so that the gas inside the unit cell of the sealed environment expands and the temperature rises, and explosion accidents occur in severe cases.

At present, the lithium battery mostly sets up explosion-proof valve structure and prevents explosion accident emergence, and explosion-proof valve is including having the main valve body that holds the chamber and sliding the gland that sets up in the main valve body, still including being used for controlling the gland and sliding in order to make gas follow the quick pressure release of clearance between main valve body and the gland, elastic component is including holding the intracavity with gland connected piston rod and the spring of cover on locating the piston rod, still be provided with between gland and the piston rod and be used for carrying out gas exchange, keep pressure balance's ventilated membrane.

When the pressure inside the battery is large, the breathable film is difficult to pass through a large amount of gas, so that the internal pressure and the external pressure are unbalanced, explosion and rupture can occur at any position of the battery shell, thereby causing explosion accidents and further causing economic loss.

Disclosure of Invention

Based on the above, an object of the present utility model is to provide an explosion-proof valve structure of a lithium battery, so as to solve the technical problems set forth in the above background.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the explosion-proof valve structure of the lithium battery comprises a top cover plate, wherein an explosion-proof component is arranged at the center of the surface of the top cover plate, a channel penetrating to the bottom end of the top cover plate is formed in the top end of the top cover plate, and two groups of ventilation grooves are formed in the inner wall of the channel;

the explosion-proof assembly comprises a fixed ring fixed on the inner wall of a channel, a piston matched with the channel is arranged below the fixed ring, a plurality of groups of base rods are fixed on the top end of the piston, the plurality of groups of base rods penetrate through the fixed ring and are fixed with movable rings, a plurality of groups of pointed cones are fixed on the top end of each movable ring, the top end of each top cover plate is located on the outer side of the channel and is connected with a limiting cylinder through threads, and a breathable film is fixed on the top end of each limiting cylinder.

Preferably, the top end of the top cover plate is provided with an anode on one side of the channel, and a cathode is provided on one side of the channel away from the anode.

Preferably, the top of lamina tecti is located the outside of spacing section of thick bamboo and is fixed with the butt joint frame through the bolt, the top of butt joint frame is fixed with the safety cover, and the left and right sides surface of safety cover has seted up the transom.

Preferably, a notch is formed in the outer wall of the piston, and the notch is located right below the ventilation groove.

Preferably, the number of the base rods is four, the base rods are distributed in an annular array and are arranged at the top ends of the pistons, and through holes which are matched with each other are formed in the contact positions of the fixing rings and the four groups of base rods.

Preferably, the top end of the piston and the bottom end of the fixing ring are fixed with two groups of rubber sheets, and the two groups of rubber sheets are wavy.

In summary, the utility model has the following advantages:

according to the utility model, the notch of the outer wall of the piston is communicated with the ventilation groove through lifting the piston, so that the pressure release purpose is achieved by discharging gas through the ventilation film, the piston is driven to continuously lift when the pressure in the lithium battery is overlarge, and then the pointed cone at the top end of the movable ring is supported to puncture the ventilation film, the obstruction to the gas in the battery is reduced, the efficient pressure release purpose is achieved, and the explosion condition of the lithium battery is further avoided.

Drawings

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

FIG. 2 is a perspective expanded view of the present utility model;

fig. 3 is a perspective view of the piston of the present utility model.

In the figure: 100. a top cover plate; 101. a vent groove; 102. a channel;

110. a positive electrode; 120. a negative electrode; 130. an explosion-proof assembly; 131. a protective cover; 1311. a butt joint frame; 132. a ventilation window; 133. a limiting cylinder; 134. a breathable film; 135. a movable ring; 1351. a pointed cone; 136. a fixing ring; 137. a base rod; 138. a piston; 1381. a rubber sheet; 139. and (5) a notch.

Description of the embodiments

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

Hereinafter, an embodiment of the present utility model will be described in accordance with its entire structure.

1-3, an explosion-proof valve structure of a lithium battery comprises a top cover plate 100, wherein an explosion-proof component 130 is arranged at the center of the surface of the top cover plate 100, a channel 102 penetrating to the bottom end of the top cover plate 100 is arranged at the top end of the top cover plate 100, and two groups of ventilation grooves 101 are arranged on the inner wall of the channel 102;

the explosion-proof assembly 130 comprises a fixed ring 136 fixed on the inner wall of the channel 102, a piston 138 engaged with the channel 102 is arranged below the fixed ring 136, a plurality of groups of base rods 137 are fixed at the top end of the piston 138, the top ends of the groups of base rods 137 penetrate through the fixed ring 136 and are fixedly provided with movable rings 135, a plurality of groups of pointed cones 1351 are fixed at the top ends of the movable rings 135, a limiting cylinder 133 is arranged on the outer side of the channel 102 at the top end of the top cover plate 100 through threaded connection, and an air permeable membrane 134 is fixed at the top end of the limiting cylinder 133.

When the pressure in the lithium battery is high, the gas pushes the piston 138 to rise in the inner wall of the channel 102, so that a notch 139 on the outer wall of the piston 138 is communicated with the ventilation groove 101, the gas passes through and is discharged into the protective cover 131 through the ventilation film 134, and finally, the gas is discharged through the ventilation window 132 to achieve the aim of pressure relief;

when the pressure inside the lithium battery is too high and the air permeability of the air permeable membrane 134 is insufficient to achieve the pressure release effect, the air inside the lithium battery continuously pushes the piston 138 to rise, the movable ring 135 is supported to rise through the base rod 137, so that the multiple groups of sharp cones 1351 at the top end of the movable ring puncture the air permeable membrane 134, the pressure release effect is improved, and the explosion of the lithium battery is avoided.

Referring to fig. 1 and 2, the top end of the top cover 100 is provided with a positive electrode 110 on one side of the channel 102, and a negative electrode 120 on one side of the channel 102 away from the positive electrode 110.

The lithium battery is convenient to convey the internal electric energy of the lithium battery to the outside to finish the effect of power supply.

Referring to fig. 1 and 2, a butt joint frame 1311 is fixed on the top end of the top cover plate 100 outside the limiting cylinder 133 by bolts, a protection cover 131 is fixed on the top end of the butt joint frame 1311, and ventilation windows 132 are opened on the left and right surfaces of the protection cover 131.

Blocking dust and water above the breathable film 134, and avoiding blocking to influence pressure release inside the lithium battery

Referring to the figure, a notch 139 is formed on the outer wall of the piston 138, and the notch 139 is located directly below the ventilation slot 101.

When the piston 138 is lifted, the notch 139 on the outer wall of the piston is communicated with the ventilation groove 101, so that the gas in the lithium battery can flow until being discharged.

Referring to fig. 2 and 3, the number of the base rods 137 is four, and the base rods are distributed in an annular array and are connected to the top ends of the pistons 138, and the contact positions of the fixing rings 136 and the four base rods 137 are provided with identical through holes.

The piston 138 is limited to be linearly lifted, and the through hole is formed to be beneficial to the smooth lifting of the base rod 137.

Referring to fig. 2 and 3, two sets of rubber sheets 1381 are fixed on the top end of the piston 138 and the bottom end of the fixing ring 136, and the two sets of rubber sheets 1381 are wavy.

The raised piston 138 is subjected to a restoring force by the deformation and the automatic restoration of the rubber sheet 1381, so that the purpose of automatic restoration is achieved.

When the lithium battery is in use, when the pressure in the lithium battery is high, the gas pushes the piston 138 to rise in the inner wall of the channel 102, so that the notch 139 on the outer wall of the piston 138 is communicated with the ventilation groove 101, the gas passes through and is discharged into the protective cover 131 through the ventilation film 134, and finally, the gas is discharged through the ventilation window 132 to achieve the aim of pressure relief;

when the pressure inside the lithium battery is too high and the air permeability of the air permeable membrane 134 is insufficient to achieve the pressure release effect, the air inside the lithium battery pushes the piston 138 to rise, and the movable ring 135 is supported to rise through the base rod 137, so that the multiple groups of sharp cones 1351 at the top end of the movable ring puncture the air permeable membrane 134, and the pressure release effect is further improved.

Although embodiments of the utility model have been shown and described, the detailed description is to be construed as exemplary only and is not limiting of the utility model as the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples, and modifications, substitutions, variations, etc. may be made in the embodiments as desired by those skilled in the art without departing from the principles and spirit of the utility model, provided that such modifications are within the scope of the appended claims.

Claims

1. The utility model provides an explosion-proof valve structure of lithium cell, includes lamina tecti (100), its characterized in that: an explosion-proof component (130) is arranged at the center of the surface of the top cover plate (100), a channel (102) penetrating to the bottom end of the top cover plate (100) is formed at the top end of the top cover plate (100), and two groups of ventilation grooves (101) are formed in the inner wall of the channel (102);

the explosion-proof assembly (130) comprises a fixed ring (136) fixed on the inner wall of the channel (102), a piston (138) matched with the channel (102) is arranged below the fixed ring (136), a plurality of groups of base rods (137) are fixed at the top end of the piston (138), a plurality of groups of base rods (137) penetrate through the fixed ring (136) and are fixed with a movable ring (135), a plurality of groups of pointed cones (1351) are fixed at the top end of the movable ring (135), a limiting cylinder (133) is arranged at the top end of the top cover plate (100) outside the channel (102) in a threaded connection mode, and a breathable film (134) is fixed at the top end of the limiting cylinder (133).

2. The explosion-proof valve structure of a lithium battery according to claim 1, wherein: the top of the top cover plate (100) is provided with a positive electrode (110) on one side of the channel (102), and a negative electrode (120) is arranged on one side of the channel (102) away from the positive electrode (110).

3. The explosion-proof valve structure of a lithium battery according to claim 1, wherein: the top of lamina tecti (100) is located the outside of spacing section of thick bamboo (133) and is fixed with butt joint frame (1311) through the bolt, the top of butt joint frame (1311) is fixed with safety cover (131), and ventilation window (132) have been seted up on the left and right sides surface of safety cover (131).

4. The explosion-proof valve structure of a lithium battery according to claim 1, wherein: a notch (139) is formed in the outer wall of the piston (138), and the notch (139) is located right below the ventilation groove (101).

5. The explosion-proof valve structure of a lithium battery according to claim 1, wherein: the number of the base rods (137) is four, the base rods are distributed on the top ends of the pistons (138) in an annular array, and through holes which are matched with each other are formed in the contact positions of the fixing rings (136) and the four groups of the base rods (137).

6. The explosion-proof valve structure of a lithium battery according to claim 1, wherein: two groups of rubber sheets (1381) are fixed at the top end of the piston (138) and the bottom end of the fixed ring (136), and the two groups of rubber sheets (1381) are wavy.