Battery

Abstract

A battery (1) comprising: a housing (10) having a first opening (11) and a receiving cavity (12); a cell group (20) disposed in the receiving cavity (12); anda cover unit (30) connected to the first opening (11) of the housing (10) in an insulating manner, characterized in that the cover unit (30) includes a cover (31), the cover (31) includes a cover main body (31A) and a positioning part (31B), and the positioning part (31B) is formed by extending the cover main body (31A) toward the housing (10), and the positioning part (31B) is located on the side of the cover (31) facing the housing (10), and the cover (31) is tightly welded to the housing (10) through the positioning part (31B);an insulating gasket disposed between the cell group (20) and the cover (31), a current collecting plate (60) disposed between the cell group (20) and the cover (31) and one side of the current collector plate (60) is in contact with the cell group (20),the other side of the current collecting plate (60) is in contact with the cover plate (31), a pole post (50) and a pole post through hole (13), and the pole post (50) is disposed in the pole post through hole (13); wherein the pole post through hole (13) is disposed at the bottom of the battery (1), and the bottom of the battery (1) is opposite to the first opening (11), and the center line of the pole post through hole (13) coincides with the center line of the first opening (11), and one of the housing (10), the cover plate (31) and the pole post (50) is provided with a liquid injection opening (1A), and the cover plate unit (30) further includes a sealing plate (40) sealedly connected to the liquid injection opening (1A).,