CN214957238U

CN214957238U - Explosion-proof lithium battery

Info

Publication number: CN214957238U
Application number: CN202121296395.6U
Authority: CN
Inventors: 付锦军; 吴乃平
Original assignee: Dongguan Jingjia Energy Co ltd
Current assignee: Guangdong Jingjia Technology Co.,Ltd.
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2021-11-30
Anticipated expiration: 2031-06-10

Abstract

The utility model discloses an explosion-proof lithium battery, which comprises a lithium battery body, wherein the lithium battery body comprises a shell and an electric core component arranged in the shell, the upper end surface of the shell is provided with an cover plate, the cover plate comprises a top cover plate, the middle position of the top cover plate is provided with a mounting hole, an explosion-proof sheet is embedded in the mounting hole, the upper end surface of the explosion-proof sheet is provided with an explosion-proof valve protection sheet, the upper end surface of the shell is also provided with a positive lug and a negative lug, the middle area in the shell is provided with a heat pipe, the lower end of the heat pipe is a condensation end, the condensation end is provided with a plurality of radiating fins, the inner side wall of the shell is filled with an insulating layer, and the outer surface of the insulating layer is provided with an explosion-proof net; the utility model discloses effectually with heat transfer to silica gel conducting strip, the silica gel conducting strip is effectual goes out heat transfer to the effectual temperature that reduces the lithium cell, and improved the homogeneity of the inside temperature of lithium cell, avoided the higher phenomenon that explodes of lithium cell temperature.

Description

Explosion-proof lithium battery

Technical Field

The utility model relates to a lithium cell technical field specifically is an explosion-proof lithium cell.

Background

The lithium battery is a battery containing lithium (including metallic lithium, lithium alloy, lithium ion and lithium polymer) in an electrochemical system, has the advantages of high working voltage, light weight, high specific energy, small self-discharge, no memory effect, no environmental pollution and the like, and is an ideal energy source for future development, but the materials selected by the lithium battery and the battery process are still to be improved. The lithium battery can produce a large amount of heats at the during operation, if not dispel the heat in time, can lead to the inside a large amount of heats of battery of gathering, battery case inflation to bring very big hidden danger for the security of battery, probably explode in the serious time, dangerous its life safety.

SUMMERY OF THE UTILITY MODEL

In order to overcome the deficiencies of the prior art, the utility model provides an explosion-proof lithium battery can the effectual problem that the solution background art provided.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides an explosion-proof lithium battery, includes lithium cell body, lithium cell body include the casing and set up in the inside electric core subassembly of casing, the electric core subassembly is including superimposed positive plate, diaphragm and negative pole piece in proper order, the casing up end is provided with the apron, the apron includes the top cap piece, the mounting hole has been seted up to top cap piece intermediate position, the embedding has explosion-proof piece in the mounting hole, explosion-proof piece up end is provided with the explosion-proof valve screening glass, the casing up end still is provided with anodal ear and negative pole ear, just anodal ear and negative pole ear run through the apron, the inside middle zone of casing is provided with the heat pipe, the heat pipe lower extreme is the condensation end, the condensation end is provided with a plurality of radiating fin, the casing inside lateral wall is filled there is the insulating layer, the insulating layer surface has explosion-proof net.

By way of further illustration, the positive tab is connected with the positive tab, and the negative tab is connected with the negative tab.

As a further elaboration, the outer surface of the shell is wrapped with silica gel heat conducting fins through heat conducting glue.

By way of further illustration, the width of the mounting hole is consistent with the width of the rupture disk, and the height of the rupture disk is greater than the depth of the mounting hole.

As further elaboration, the safety support is welded on the bottom surface of the top cover plate, and the explosion-proof sheet is welded on the mounting hole through laser welding and is in seamless sealing connection with the mounting hole.

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

in the explosion-proof lithium battery provided by the embodiment, through the matching of the top cover plate, the explosion-proof sheet, the explosion-proof valve protection sheet and the safety bracket, under a certain working life or a specific extreme working condition, after the gas derived from the electric core assembly in the shell during working generates a certain pressure in the shell, an explosive hazard is formed in the shell, in order to protect the safe operation of the electric core assembly, the accumulated gas derived from the pressure needs to be released, at the moment, the central part of the explosion-proof sheet is pressed by the derived gas to tear the explosion-proof valve protection sheet and the explosion-proof valve protection sheet, so that the pressure in the shell is released, and the safety of the electric core assembly in the shell is protected; because the central area of the lithium battery has smaller functionality, the heat pipe and the radiating fins arranged in the central area have smaller influence on the performance of the lithium battery; in addition, can effectually accelerate lithium cell central zone's heat transfer to the outside, because lithium cell central zone temperature is the highest, arrange the heat pipe with lithium cell central zone, be favorable to the inside temperature control of lithium cell within reasonable scope, radiating fin can effectually transmit heat to the silica gel conducting strip simultaneously, the silica gel conducting strip is effectual goes away the heat transfer, thereby the effectual temperature that reduces the lithium cell, and the homogeneity of the inside temperature of lithium cell has been improved, avoid the higher phenomenon of explosion appearing of lithium cell temperature.

Drawings

Fig. 1 is a schematic structural diagram of an explosion-proof lithium battery according to the present invention;

fig. 2 is another schematic structural diagram of an explosion-proof lithium battery of the present invention;

fig. 3 is a schematic structural diagram of an explosion-proof cover plate of a lithium battery according to the present invention.

Reference numbers in the figures: 1-a lithium battery body; 2-a shell; 3-an electrical core assembly; 4-positive plate; 5-a separator; 6-negative pole piece; 7-cover plate; 8-top cover sheet; 9-mounting holes; 10-explosion-proof piece; 11-explosion-proof valve protection plate; 12-positive tab; 13-negative tab; 14-a heat pipe; 15-heat dissipation fins; 16-an insulating layer; 17-explosion-proof net; 18-silica gel heat conducting sheet; 19-safety support.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-3, the explosion-proof lithium battery provided in this embodiment includes a lithium battery body 1, the lithium battery body 1 includes a casing 2 and an electric core component 3 disposed inside the casing 2, the electric core component 3 includes a positive plate 4, a diaphragm 5 and a negative plate 6 stacked in sequence, the upper end surface of the casing 2 is further provided with a positive tab 12 and a negative tab 13, the positive tab 12 and the negative tab 13 penetrate through the cover plate 7, the positive tab 4 is connected to the positive tab 12, and the negative plate 6 is connected to the negative tab 13.

A cover plate 7 is arranged on the upper end face of the shell 2, the cover plate 7 comprises a top cover plate 8, a mounting hole is formed in the middle of the top cover plate 8, an explosion-proof sheet 10 is embedded in the mounting hole, the width of the mounting hole is consistent with the width of the explosion-proof sheet 10, and the height of the explosion-proof sheet 10 is larger than the depth of the mounting hole; an explosion-proof valve protection plate 11 is arranged on the upper end face of the explosion-proof sheet 10, a safety bracket 19 is welded on the bottom face of the top cover plate 8, and the explosion-proof sheet 10 is welded in the mounting hole through laser welding and is in seamless sealing connection with the mounting hole; through the cooperation between the top cover piece 8, the explosion-proof piece 10, the explosion-proof valve protection sheet 11 and the safety bracket 19, under certain working life or specific extreme working condition, after the electric core assembly 3 in the casing 2 generates certain pressure in the casing 2 during working, the explosion-proof valve protection sheet 11 will form explosive danger in the casing 2, in order to protect the safe operation of the electric core assembly 3, the accumulated gas with derived pressure needs to be released, at this moment, the central part of the explosion-proof piece 10 will tear the explosion-proof valve protection sheet 11 under the top pressure of the derived gas, so as to release the pressure in the casing 2, thereby protecting the safety of the electric core assembly 3 in the casing 2.

The middle area in the shell 2 is provided with a heat pipe 14, the lower end of the heat pipe 14 is a condensation end, the condensation end is provided with a plurality of radiating fins 15, and the central area of the lithium battery is less in functionality, so that the heat pipe 14 and the radiating fins 15 arranged in the central area have less influence on the performance of the lithium battery; in addition, can effectually accelerate the heat transfer of lithium cell central zone to the outside, because lithium cell central zone temperature is the highest, arrange heat pipe 14 with lithium cell central zone, be favorable to the inside temperature control of lithium cell within reasonable scope, radiating fin 15 can effectually transmit the heat to silica gel conducting strip 18 simultaneously, the silica gel conducting strip 18 is effectual goes out the heat transfer, thereby the effectual temperature that reduces the lithium cell, and the homogeneity of the inside temperature of lithium cell has been improved.

2 inside wall packing of casing has insulating layer 16, there is explosion-proof net 17 insulating layer 16 surface, through insulating layer 16 and explosion-proof setting, harm when can reducing the lithium cell explosion has solved current lithium cell and has easily taken place the explosion, lacks safety device's problem.

The outer surface of the shell 2 is wrapped by the heat conducting glue to form a silica gel heat conducting sheet 18, the silica gel heat conducting sheet 18 can rapidly transmit heat in the shell 2 to the outside, the heat dissipation effect of the lithium battery is improved, and the phenomenon that the lithium battery is high in temperature and explodes is avoided.

In summary, in the explosion-proof lithium battery provided in this embodiment, through the cooperation between the top cover plate 8, the explosion-proof sheet 10, the explosion-proof valve protection sheet 11 and the safety bracket 19, under a certain working life or a specific extreme working condition, after a certain pressure is generated in the housing 2 by the gas derived from the operation of the electric core assembly 3 in the housing 2, an explosive hazard is formed in the housing 2, and in order to protect the safe operation of the electric core assembly 3, the accumulated gas derived from the pressure needs to be released, at this time, the central part of the explosion-proof sheet 10 will tear the explosion-proof and explosion-proof valve protection sheet 11 under the top pressure of the derived gas, so as to release the pressure in the housing 2, thereby protecting the safety of the electric core assembly 3 in the housing 2; because the central area of the lithium battery has smaller functionality, the heat pipe 14 and the radiating fins 15 arranged in the central area have smaller influence on the performance of the lithium battery; in addition, can effectually accelerate the regional heat transfer of lithium cell center to the outside, because lithium cell center region temperature is the highest, arrange heat pipe 14 with lithium cell center region, be favorable to the inside temperature control of lithium cell within reasonable scope, radiating fin 15 can effectually transmit heat to silica gel conducting strip 18 simultaneously, silica gel conducting strip 18 is effectual goes out the heat transfer, thereby the effectual temperature that reduces the lithium cell, and the homogeneity of the inside temperature of lithium cell has been improved, avoid the higher phenomenon of explosion that appears of lithium cell temperature.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An explosion-proof lithium cell which characterized in that: including lithium cell body, lithium cell body include the casing and set up in the inside electric core subassembly of casing, the electric core subassembly is including superimposed positive plate, diaphragm and negative pole piece in proper order, the casing up end is provided with the apron, the apron includes the top cap piece, the mounting hole has been seted up to top cap piece intermediate position, the embedding has explosion-proof piece in the mounting hole, explosion-proof piece up end is provided with the explosion-proof valve screening glass, the casing up end still is provided with anodal ear and negative pole ear, just anodal ear runs through with the negative pole ear the apron, the inside intermediate zone of casing is provided with the heat pipe, the heat pipe lower extreme is the condensation end, the condensation end is provided with a plurality of radiating fin, the lateral wall is filled with the insulating layer in the casing, the insulating layer surface has explosion-proof net.

2. An explosion-proof lithium battery as claimed in claim 1, characterized in that: the positive plate is connected with the positive lug, and the negative plate is connected with the negative lug.

3. An explosion-proof lithium battery as claimed in claim 1, characterized in that: the outer surface of the shell is wrapped with silica gel heat conducting fins through heat conducting glue.

4. An explosion-proof lithium battery as claimed in claim 1, characterized in that: the width of the mounting hole is consistent with that of the explosion-proof sheet, and the height of the explosion-proof sheet is greater than the depth of the mounting hole.

5. An explosion-proof lithium battery as claimed in claim 1, characterized in that: the bottom surface of the top cover plate is welded with a safety support, and the explosion-proof sheet is welded in the mounting hole through laser welding and is in seamless sealing connection with the mounting hole.