Battery, battery box body and power utilization device

The utility model discloses a battery, a battery box body and an electric device. The battery comprises a battery box body and a battery monomer, the battery box body forms a containing space, the battery box body comprises a body and a heat exchange piece, the body comprises a first metal layer and a second metal layer which are stacked, and the body serves as a wall body of the containing space; the heat exchange piece is welded with the second metal layer; the first metal layer is made of a first material; the second metal layer and the heat exchange piece are made of a second material; the battery monomers are arranged in the accommodating space; the first metal layer comprises a steel plate layer, the second metal layer comprises an aluminum plate layer, and the heat exchange piece comprises an aluminum heat exchange piece. Or the first metal layer comprises an aluminum plate layer, the second metal layer comprises a steel plate layer, and the heat exchange piece comprises a steel heat exchange piece; the body is provided with a first aluminum stripping area and further comprises a supporting beam, and the supporting beam is located in the containing space and welded to a steel plate layer corresponding to the first aluminum stripping area. According to the invention, the assembly process can be simplified, the stability between the heat exchange piece and the body is improved, and the heat management efficiency of the battery is improved.