Anti-rotating polar column sealing structure of lithium ion accumulator

The invention discloses an anti-rotating polar column sealing structure of lithium ion accumulator. The structure comprises a rotation-stopping bush hermetically fixed at the bottom of the polar column; a first step and a second step orderly arranged on the bottom of the polar column in a protruding way; an upper part of the rotation-stopping bush is sleeved on an outer wall of the second step tolock an end cover, and the lower part is propped against the first step; a sealing insulator is sleeved on the polar column, an aluminum alloy bush matched with the outer wall is sleeved on the external of the sealing insulator, and the aluminum alloy bush is fixedly connected with the end cover; a first ceramic gasket and a second ceramic gasket are arranged on a bottom end and a top end of the sealing insulator; the first ceramic gasket is propped against the second step of the polar column, and a disk gasket and a hexagon nut are arranged on the second ceramic gasket. Through the anti-rotating polar column sealing