BATTERY CASE AND BATTERY PACK

A battery box (100) and a battery pack relate to the field of batteries. The battery box (100) includes a box body (110), a cooling plate (120), and a stiffener (130). The cooling plate (120) is connected with an outside of a wall plate (112) of the box body (110), and the stiffener (130) is connected with the box body (110) and abuts against a side of the cooling plate (120) away from the wall plate (112). The cooling plate (120) is connected with the box body (110), the stiffener (130) is connected with the box body (110), and the stiffener (130) abuts against the side of the cooling plate (120) away from the wall plate (112). The stiffener (130) can keep the cooling plate (120) and the box body (110) in an abutting state, and when the cooling plate (120) is subjected to an external pressure or an action of the battery module, the cooling plate (120) may be bent or deformed, resulting in a gap between the cooling plate (120) and the wall plate (112). The stiffener (130) is connected with the box body (110) and abuts against the cooling plate (120) to increase strength and stiffness of a connection between the cooling plate (120) and the box body (110), so as to avoid a sealing failure caused by the force applied to a weld seam between the cooling plate (120) and the box body (110) during operation of the battery pack, which leads to a failure of a cooling effect of the cooling plate (120).