Lithium ion battery and with high safety performance and battery module

Abstract

The invention discloses a lithium ion battery and with high safety performance and a battery module. The lithium ion battery comprises an anti-explosion shell, an anti-explosion cap cover for sealingthe anti-explosion shell; an anti-explosion nicking is arranged at the bottom of the anti-explosion shell the anti-explosion cap cover comprises a top cover, an anti-explosion sheet, an insulation washer, a pore plate and a sealing ring; the pore plate is free from arranging the through hole; and an opening is formed on the insulation washer. Through the above arrangement, when a cell is exploded,the explosive blast wave is propagated to two ends to break through the anti-explosion nicking at the bottom of the battery shell with strong pressure, thereby preventing the explosion pressure fromleaking in advance; the pressure relief by opening two ends at the same time can be realized, thereby preventing the cell from upwardly ejecting, and preventing the ejected object from melting througha steel casing slot rolling, and preventing the high-temperature substance from ejecting to the peripheral adjacent cells. By comprehensively solving the chamber explosion, hole fusion and a large amount of cell ejection, the path of thermal diffusion of the monomer cell is blocked, and the safety performance of the high-nickel lithium ion battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of thermal safety of lithium ion batteries, in particular to a lithium ion battery and a battery module with high safety performance. Background technique [0002] With the intensification of the energy crisis and the deterioration of the environment, people urgently need clean energy to replace traditional fossil energy. Lithium-ion batteries have attracted more and more attention because of their advantages such as high capacity, long cycle life and environmental friendliness. With the continuous development of science and technology, lithium-ion batteries are used more and more frequently in all walks of life, and higher and higher requirements are put forward for the energy density of lithium-ion batteries. The requirement has reached 300Wh / kg. The method of increasing the energy density can be carried out by increasing the high compaction of the material and the capacity of the material. The space for...

AI Technical Summary

Problems solved by technology

This open structure makes the pressure generated by the explosion of the battery cell preferentially ejected to one port. It is easy to cause the explosion-proof notch at the bottom of the battery case to be opened due to insufficient pressure, so that the explosion-proof case cannot play an explosion-proof role.

Also because the perforated plate has a guiding effect on the direction of the airflow, a large amount of high-temperature and high-speed fluid is ejected from the upper port, which is more likely to cause the problem of melting holes in the steel shell; these problems are the main reason for the thermal runaway diffusion of cylindrical cells

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