Battery monomer, energy storage device and electric equipment

The utility model discloses a battery monomer, which comprises a battery cell, a pole and an adapter, and the battery cell comprises a cell body having a first surface and a second surface which intersect with each other; the first tab is arranged on the first surface; the second tab is arranged on the second surface; the adapter comprises a base part and a connecting pole, the base part is arranged opposite to the first surface and provided with a first tab connecting part connected with the first tab and a pin, and the connecting base part, the pin and the second surface are arranged opposite to each other and provided with a second tab connecting part connected with the second tab. Through the design that the plurality of tabs and the plurality of tab connecting parts are matched with each other, the area of an over-current region between the battery cell and the adapter is increased, so that the contact area is increased, the current density between the adapter and the connection position of the battery c