A cylindrical lithium-ion battery

Abstract

The application discloses a cylindrical lithium ion battery, the end structure of which comprises a cover plate assembly, a current collecting plate assembly and a full tab structure of a roll core. The cover plate assembly comprises a cover plate body and a safety valve arranged on the cover plate body. The current collecting plate body of the current collecting plate assembly is provided with an exhaust port at a position corresponding to the safety valve. The full tab structure is provided with an exhaust groove extending to the inside of the roll core at a position corresponding to the exhaust port. The exhaust groove is aligned with and communicates with the exhaust port. The exhaust port is aligned with and communicates with the safety valve. The exhaust groove, the exhaust port and the safety valve jointly form an exhaust channel. The gas generated in the cylindrical lithium ion battery can diffuse from the material area of the roll core to the full tab structure, flow along the exhaust channel formed by the exhaust groove, the exhaust port and the safety valve, and finally rush out through the safety valve, so that the blocking effect of the full tab structure on the gas in the battery can be weakened, and the safety of the battery can be improved.

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