Battery monomer, battery and electric device

The invention discloses a battery monomer, a battery and a power utilization device, the battery monomer comprises an electrode assembly, a shell and an electrode terminal, the electrode assembly is at least partially accommodated in the shell, the electrode terminal is electrically connected to the electrode assembly, and the electrode terminal is arranged on the wall part of the shell; wherein the electrode terminal comprises a first metal layer body and a second metal layer body which are made of different materials, the first metal layer body is located on the side, facing the electrode assembly, of the second metal layer body in the thickness direction of the wall part, the first metal layer body and the second metal layer body are connected to form a connection interface, and at least part of the connection interface is a curved surface. According to the battery monomer provided by the embodiment of the invention, at least part of the connection interface between the first metal layer body and the second metal layer body which are made of different materials is set to be the curved surface, so that the connection strength between the first metal layer body and the second metal layer body is effectively improved, and the risk of breakage of the electrode terminal is reduced; and the performance of the battery monomer is improved.