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.