Battery housing, lithium-ion secondary battery, and electric vehicle

A battery housing, wherein the battery housing has openings at both ends in the length direction, at least one cooling unit extending along the length direction is provided in the battery housing, a coolant channel for circulation of a coolant is provided in the cooling unit, 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 the height direction, each accommodating cavity is configured for accommodating a battery cell;

• the battery housing has a prismatic structure and comprises two opposite first side plates and two opposite second side plates, the two first side plates and the two second side plates are connected to each other, and the internal space of the battery housing is formed by the enclosure of the two first side plates and the two second side plates;
• each cooling unit comprises two opposite first partition plates, the two first partition plates are spaced apart from top to bottom and extend in the length direction, and each cooling unit further comprises two opposite second partition plates, the two second partition plates are spaced apart from left to right and extend in the length direction, the outer wall of one of the second partition plates is attached to the inner wall of one of the first side plates, and the outer wall of the other second partition plate is attached to the inner wall of the other first side plate, the two first partition plates and the two second partition plates are connected to each other, the coolant channel is formed by the enclosure of the two first partition plates and the two second partition plates.