BATTERY DEVICE, ENERGY STORAGE DEVICE, AND ELECTRIC DEVICE

A battery device includes: a box body; a battery cell, accommodated in the box body; and an electric control assembly, accommodated in the box body. The electric control assembly includes a bracket and an electric control component. The bracket includes a bracket body. A side that is of the bracket body and that faces the battery cell is connected to a protruding structure, and a side that is of the bracket body and that is away from the battery cell is provided with the electric control component. The electric control assembly further includes a heat insulation plate disposed on the side that is of the bracket body and that faces the battery cell. The heat insulation plate, the bracket body, and the protruding structure enclose to form a cavity.