CONNECTING PIECE DESIGN METHOD, CONNECTING PIECE, ENERGY STORAGE DEVICE, AND ELECTRIC DEVICE

Disclosed in the present invention are a connecting piece design method, a connecting piece, an energy storage device, and an electric device. The connecting piece design method comprises: acquiring the area S of a welding region of a connecting piece for connecting to a tab; dividing the connecting piece into first active regions and a second active region, wherein the first active regions are regions of the connecting piece that have regular shapes, the second active region is a region where the connecting piece is connected to a pole, there are N first active regions (10), N≥1, and the plurality of first active regions (10) are connected to the same side of the second active region (20); and determining the dimensions of the first active regions according to S=aS1, wherein a=0.095-0.96, and S1 is the area of each first active region. Therefore, the size of the welding region of the connecting piece connected to the tab meets a current passing requirement, and the dimensions of the first active regions are