CN2514496Y

CN2514496Y - Explosion-proof lithium ion cell

Info

Publication number: CN2514496Y
Application number: CN01252383U
Authority: CN
Inventors: 余章华; 徐光华; 王锦东; 候文秀; 赵德勇; 伦绪铎
Original assignee: Wuhan Lixing Torch Power Sources Co ltd
Current assignee: Wuhan Lixing Torch Power Sources Co ltd
Priority date: 2001-11-08
Filing date: 2001-11-08
Publication date: 2002-10-02
Anticipated expiration: 2011-11-08

Abstract

The utility model discloses an explosion-proof lithium battery, comprising a battery shell which is sealed and connected with a battery cover, a positive and a negative diaphragm roll cores which are arranged in the battery shell, electrolytic solution, and the battery cover and/or the battery cover provided with an explosion-proof safety valve the battery cover is connected with the positive and the negative diaphragm roll cores. When the short circuit happens and the inner energy is quickly exported, then the pressure in the battery is increased, when the pressure in the battery reaches to the limited pressure of the explosion-proof safety valve, the explosion-proof safety valve opens, and the high-pressure air is released, then the pressure in the battery is decreased, thereby avoiding the explosion of the battery. The explosion-proof lithium battery has the advantages of simple structure, low cost, excellent explosion-proof effects, and reliable usage.

Description

Explosion-proof lithium ion battery

Technical field

The utility model belongs to secondary lithium battery, is specifically related to explosion-proof secondary lithium battery.

Background technology

Lithium ion battery is a kind of voltage height, high-specific energy battery capacious.The power of battery is big, when the user use battery-operated not at that time, as being subjected to severe impact or accidental short circuit, the energy of battery can discharge within a short period of time, thereby causes blast.The disclosed explosion-proof lithium ion battery of ZL00228154 by punching press on battery case, forms the meshing easy pressure relief of the plane of disruption local deformation.This structure processing request height, the processing cost height.

Summary of the invention

The purpose of this utility model is to provide a kind of explosion-proof lithium ion battery, to overcome the defective that above-mentioned lithium ion battery exists.

The technical solution of the utility model realizes like this: explosion-proof lithium ion battery comprises battery case, battery cover is tightly connected on the battery case, the both positive and negative polarity membrane coil core of establishing in the battery case, battery cover connect both positive and negative polarity volume core, electrolyte, the quick-fried safety valve of setting up defences on battery cover and/or the battery cover.This explosion-proof lithium ion battery explosion-proof device is simple, low cost of manufacture, and explosion-proof effect is good, and battery is safe in utilization.

Description of drawings

The explosion-proof lithium ion battery structure schematic diagram of Fig. 1

Fig. 2 battery bottom schematic diagram

Fig. 3 explosion relief valve structural representation

Embodiment

As shown in Figure 1, battery case 2 sealed at both ends connection cover group 1 and bottoms 3.Both positive and negative polarity membrane coil core and electrolyte 5 are housed in the battery case 2.Battery cover connects both positive and negative polarity volume core.Explosion relief valve 6 is located at (as shown in Figure 2) on the battery bottom 3.Battery case and battery cover overcoat thermal shrinkable sleeve 4.Explosion relief valve 6 is enclosed within the thermal shrinkable sleeve 4.

As shown in Figure 3, the structure of explosion relief valve 6 is as follows: it is to open relief hole 7 on battery bottom 3, and metal forming 8 is established in relief hole 7 inboards.Metal forming is bonding or be welded on battery floor and cover, and relief hole 7 is covered and with its sealing, can prevent that electrolyte from leaking outside from the battery bottom is inboard.Explosion relief valve 6 also can be located on battery case 2 and/or the lid group 1.Same structure also can realize on battery case.

The operation principle of this explosion relief valve is: when battery is short-circuited, when internal energy was sharply emitted, inside battery air pressure increased.When internal pressure reached the pressure-bearing limit of metal copper foil, metal copper foil broke, and gases at high pressure are discharged from relief hole, reduced the pressure in the battery, thereby reached the purpose that prevents battery explosion.By the thickness of adjusting metal forming and the size control release pressure in relief hole aperture.

Claims

1, a kind of explosion-proof lithium ion battery, it comprises battery case, and the battery cover that is tightly connected on the battery case, the both positive and negative polarity membrane coil core of establishing in the battery case, battery cover connect both positive and negative polarity volume core, and electrolyte is characterized in that the quick-fried safety valve of setting up defences on battery cover and/or the battery cover.

2, explosion-proof according to claim 1 lithium ion battery is characterized in that the safety anti-explosive valve comprises the relief hole of offering on battery cover and/or the battery cover, covers the metal forming of relief hole.

3,, it is characterized in that battery floor covers the metal forming of establishing relief hole and covering relief hole as explosion-proof lithium ion battery as described in the claim 2.

4,, it is characterized in that metal forming covers relief hole in the sealing of battery bottom inner face as explosion-proof lithium ion battery as described in the claim 3.