Battery cell, battery and electric device

The invention discloses a battery monomer, a battery and a power utilization device. The battery cell includes a housing, an electrode terminal, a first connector, and an insulating film. The first end wall is provided with a first through hole, and the first through hole penetrates through the first end wall in the thickness direction of the first end wall. The electrode terminal is mounted in the first through hole. At least part of the first connecting piece is located on the outer side of the first end wall in the thickness direction, and the first connecting piece is arranged in the circumferential direction of the electrode terminal and connected with the electrode terminal. And an insulating film covering at least a portion of an outer surface of the first end wall, the insulating film being provided with a second through hole exposing the electrode terminal, the insulating film being connected to the first connector. According to the technical scheme, the reliability of the battery can be improved.