New energy explosion-proof lithium battery

Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a new energy explosion-proof lithium battery. The lithium battery comprises a shell, a cover plate and abattery cell; the battery cell is fixedly arranged in the shell; the cover plate and the shell are welded through ultrasonic waves or lasers; the battery cell is electrically connected with an electrode on the cover plate through a lead; the cover plate comprises a main body, and electrodes are fixedly mounted at the two ends of the main body; a weak groove is formed in the middle of the main body; a deformation plate is fixedly mounted in the weak groove; an extrusion column is mounted in the weak groove in a sliding manner; a puncture block is arranged at the upper end of the extrusion column; the lower end of the extrusion column is tightly attached to the deformation plate; the deformation plate is made of a bimetallic strip; a second sealing film is fixedly mounted in the weak groove;and the deformation plate is located above the second sealing film. The lithium battery is simple in structure and high in pressure relief precision, and meanwhile, can disconnect the battery from anexternal circuit when the battery is damaged to protect the external circuit.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a new energy explosion-proof lithium battery. Background technique [0002] Lithium-ion batteries are currently the most ideal due to the advantages of high energy density, high open circuit voltage, high output power, no memory effect, low self-discharge, fast charge and discharge speed, wide operating temperature range, long cycle life, and no toxic and harmful substances. The high-performance environmentally friendly secondary battery is widely used in various consumer electronic products, electric vehicles and other fields. The explosion of the lithium-ion battery is due to its high internal pressure, which makes the aluminum shell unbearable and bursts instantly; the battery leakage is due to the broken crack of the aluminum shell, which causes the electrolyte to seep out. Although the battery will be strictly inspected when it leaves the factory, the pressure ins...

AI Technical Summary

Problems solved by technology

The explosion of the lithium-ion battery is due to the high internal pressure, which causes the aluminum shell to be unbearable and instantly collapses; the battery leakage is due to the cracks in the aluminum shell, which cause the electrolyte to leak out

Although the battery will be strictly inspected at the factory, the internal pressure of the battery will change during use, causing explosions, leakage and other safety hazards

[0003] There are also some technical solutions in the prior art, such as the Chinese patent application number CN00228154.6, through mechanical stamping on the wall of the metal shell, the deformation between the homogeneous metal filler block of a certain shape and the defective metal shell wall is formed. The fracture surface of the explosion-proof device is formed by toothing. It can achieve a certain pressure relief accuracy. The disadvantage is that the design size is limited, the material cost is high, and the application range is narrow. When damage or short circuit causes the temperature and pressure inside the battery to rise, disconnect the connection of the external circuit of the battery to protect the external circuit

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