Battery monomer, battery and electric device

The utility model discloses a battery monomer, a battery and a power utilization device. The single battery comprises a shell, a plurality of electrode assemblies and a plurality of electric connecting pieces, an accommodating space is formed in the shell, and the shell is provided with a pole; the plurality of electrode assemblies are arranged in the accommodating space, and each electrode assembly is provided with a tab; and the plurality of electric connecting pieces are arranged in the accommodating space, and are used for conducting the pole and the tab of each electrode assembly, so that the plurality of electrode assemblies are connected in series and/or in parallel. Therefore, the plurality of electrode assemblies and the plurality of electric connecting pieces are arranged in the accommodating space, and the electrode assemblies and the electric connecting pieces can be well protected through the shell. The plurality of electrode assemblies are arranged in the shell at the same time, and the tabs of