Battery

Abstract

A battery comprising:a cell (7);an electrical connection element (6) disposed on the cell (7) and electrically connected to the cell (7), the electrical connection element (6) having an annular protrusion (61) extending away from the cell (7) such that an expansion space (62) is provided between the annular protrusion (61) and the cell (7);a connection terminal element (2) disposed on the electrical connection element (6); wherein the connecting pole element (2) comprises a central pole element part (21) and a plate-like part (23) connected to the central pole element part (21); a lower plastic element (5) fitted to the outer part of the connecting pole element (2), wherein the lower plastic element (5) is supported by the annular protruding part (61) and the connecting pole element (2), wherein the lower plastic element (5) is provided with an annular groove (51), wherein the plate-like part (23) of the connecting pole element (2) fits into the annular groove (51);a housing (3), wherein the cell (7), the electrical connection element (6) and the lower plastic element (5) are all arranged in the housing (3), and wherein the top of the housing (3) is provided with a first through-hole (31), and the connection pole element (2) is arranged so as to pass through the first through-hole (31); a sealing ring (4) fitted to the connection pole element (2) and disposed so as to be sandwiched between the connection pole element (2), the side wall of the first through-hole (31), the inner side wall of the lower plastic element (5) and the inner wall of the top of the housing (3); an upper plastic element (1) arranged on the top of the housing (3), wherein the connection pole element (2) is arranged so as to pass through the upper plastic element (1), and wherein the connection pole element (2) includes a central a sealing flange part (22) connected to the pole element part (21), which rests on the upper part of the upper plastic element (1);