Battery

Abstract

A battery comprising a casing (1), a cell pack (2), a first connection plate (3) and a terminal plate (4), wherein the cell pack (2) is disposed within the casing (1), the first connection plate (3) is disposed at one end of the casing (1), and the first connection plate (3) is connected to the cell pack (2), the terminal plate (4) is disposed on the opposite side of the cell pack (2) from the first connection plate (3), characterized in that the terminal plate (4) has at least two recessed curved grooves (42) on the side remote from the first connection plate (3), each of which is arranged in a ring around the center of the terminal plate (4), and the bottom of the curved grooves (42) is welded to the first connection plate (3), and an explosion-proof opening is formed in the center of the terminal plate (4) (41) is formed, and the first connection plate (3) has a ventilation opening (31) located opposite the explosion-proof opening (41),the pole plate (4) has a first protrusion (43) on the side close to the first connection plate (3) surrounding the explosion-proof opening (41), the end of the first protrusion (43) remote from the pole plate being connected to the first connection plate (3),