Lithium ion battery capable of improving battery safety

The invention discloses a lithium ion battery capable of improving battery safety, relates to a lithium ion battery, and particularly relates to a lithium ion battery capable of improving battery safety. The lithium ion battery capable of improving battery safety comprises a battery shell, a roll core accommodated inside the battery shell, an electrolyte filled in the battery shell, and a battery cover plate arranged on the battery shell, wherein a safety relief valve is arranged on a top cover of the lithium ion battery, and the battery cover plate is provided with a high-power shunting device. The lithium ion battery is intended to solve the problems of explosion and ignition caused by short circuiting inside the battery easily due to puncturing and extruding when a lithium ion secondary battery is abnormally used; in a case where the lithium ion battery is short-circuited, partial short-circuiting currents are shunted from another high-power loop, so that a transient current inside the battery is reduced, and the ignition and explosion caused by heating due to current concentration inside the battery are prevented.