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 (10), a jellyroll (20), a connecting sheet (30), and a top cover (40). The jellyroll (20) is provided with a tab (21), and the connecting sheet (30) includes a side wing part (32). The energy storage device includes a welding structure composed of the tab (21) and the side wing part (32). A tab sheet farthest from the side wing part (32) in the tab sheets included by the tab (21) is a first tab sheet (22), the welding structure forms a welding area (50) on the first tab sheet (22). An area of the welding area (50) is S1, an area of the side wing part (32) is S2, and a projection area of the first tab sheet (22) on a plane where the side wing part is located is S3, wherein 0.4 ≤ S1/S2 ≤ 0.8, 0.14 ≤ S1/S3 ≤ 0.28.