Abstract: Provided is a battery housing. The battery housing has an opening at both ends in a length direction, respectively, and the battery housing is provided with at least one cooling unit extending along the length direction. The cooling unit is provided with a coolant channel for coolant circulation, and the at least one cooling unit divides the internal space of the battery housing into at least two accommodating cavities spaced apart from top to bottom in a height direction. Each accommodating cavity is used for accommodating a battery cell. By providing the cooling unit in the battery housing, the heat generated by the battery cell can be dispelled immediately, thereby quickly and effectively solving the heat dissipation problem of the battery cell during charging and discharging. Also provided are a lithium-ion secondary battery and an electric vehicle.

Abstract: Provided is a lithium-ion secondary battery, comprising a housing and at least two cells packaged in the housing. The housing is provided with at least one cooling unit extending along a length direction of the housing. The cooling unit is provided with a coolant channel for coolant circulation, the cooling unit divides the internal space of the housing into at least two accommodating cavities spaced apart in a thickness direction of the housing. A battery cell is arranged in each accommodating cavity, and the cooling units are in thermal conduction contact with the cells in adjacent accommodating cavities. By providing the cooling unit in the housing, the heat generated by the battery cell can be conducted in time, thereby quickly and effectively solving the heat dissipation problem of the battery cell during charging and discharging. Also provided is an electric vehicle.

Abstract: A battery cover plate and a lithium-ion secondary battery. An electrode terminal is provided on the battery cover plate, an explosion-proof groove is also provided on the battery cover plate, and the explosion-proof groove surrounds or is set partially around the electrode terminal. The battery cover plate can burst or explode along the explosion-proof groove in the case of battery abnormality, and the battery cover plate can drive the electrode terminal to move together when the battery cover plate bursts or explodes, and the movement of the electrode terminal pulls a tab, so that the tab or the junction of the tab can be partially broken or completely broken, thereby weakening or cutting off the electric connection between the electrode terminal and a battery cell.