Box body, battery and electric device

The utility model provides a box body, a battery and a power utilization device, the box body is used for the battery, the box body is provided with an accommodating cavity, and the box body comprises a first box body part and a second box body part; the first box body part and the second box body part are mutually covered to form an accommodating cavity, the second box body part is provided with at least one first wall, a flow channel is formed in the first wall and is used for flowing of fluid, and the fluid is configured to be capable of performing heat exchange with the battery monomers in the accommodating cavity. According to the box body provided by the invention, at least part of the flowing path of the fluid for performing heat exchange with the battery monomers in the battery is integrated in the first wall of the box body, so that the space, occupied by related heat exchange parts of the battery, in the accommodating cavity of the box body is reduced, and the structure of the battery is simplified; and the energy density of the battery can be improved.