ENERGY STORAGE DEVICE AND ELECTRICAL EQUIPMENT

The present disclosure relates to an energy storage device and an electrical equipment. The energy storage device includes a housing, a jellyroll, a connecting sheet, and a top cover. The jellyroll is provided with a tab, and the connecting sheet includes a side wing part. The energy storage device includes a welding structure composed of the tab and the side wing part. A tab sheet farthest from the side wing part in the tab sheets included by the tab is a first tab sheet, the welding structure forms a welding area on the first tab sheet. An area of the welding area is S, an area of the side wing part is S, and a projection area of the first tab sheet on a plane where the side wing part is located is S, wherein 0.4≤S/S≤0.8, 0.14≤S/S≤0.28.