Battery cell, battery and electric device

The invention discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, a first insulating film and an adhesive layer. The shell comprises a first part and a second part, the first part and the second part are connected, and the surface energy of the second part is larger than that of the first part. The first insulating film covers at least a portion of the housing. And the adhesive layer is arranged between the second part and the first insulating film and is used for connecting the first insulating film and the second part. According to the technical scheme, the reliability of the battery can be improved.