Patent ID: 7807285

Claim:
An energy storage device, comprising: a case having an opening; an electrode assembly disposed within the case, the electrode assembly including at least a first polarity electrode member electrically and mechanically connected to a first electrode tab, and a second polarity electrode member electrically and mechanically connected to a second electrode tab; a cover disposed to cover the opening of the case, the cover defining a hole; and a terminal structure attached to the cover, including: a gasket made of an insulating material and fittingly disposed within the hole, an electrode insulator member disposed between the first and second electrode tabs, the insulator member defining a hole corresponding to the hole in the cover, and a fastening device having a shaft passing through the gasket and the hole in the insulator member, the fastening device applying a pressure in an axial direction of the hole in the cover to press the gasket, the cover, the first electrode tab, the electrode insulator, and the second electrode tab against each other to form a seal, the fastening device being electrically insulated from the cover.