Battery top cover structure

Abstract

A top cover unit (100) comprising: a housing (1) having a mounting hole (11); a pole piece (2) partially extending through the mounting hole (11); a pressure ring (3) fitted to the pole piece (2), characterized in that the pressure ring (3) comprises a pressure ring body (31), a raised portion (32) and a recess (33) formed on a surface of the pressure ring body (31) facing away from the housing (1); wherein the pressure ring body (31) surrounds the outer sides of both the protruding part (32) of the pressure ring (3) and the recess (33) of the pressure ring (3), wherein the protruding part (32) of the pressure ring (3) protrudes from the surface of the pressure ring body (31) facing the housing (1), wherein the protruding part (32) of the pressure ring (3) rests on a part of the side wall of the pole element (2) extending partially through the mounting hole (11), and the pole element (2) includes a protruding pole part (230) contacting the recess (33) of the pressure ring (3);anda sealing element (4) fitted to the pole element (2) and the pressure ring (3), wherein the sealing element (4) is partially wedged between the pole element (2) and the housing (1) and the pressure ring (3) and the housing (1);