Patent ID: 7012799

Claim:
An electrical energy storage device, which comprises: a) an enclosure comprising i) a first casing portion comprising a first face wall supporting a first surrounding sidewall; ii) a second casing portion comprising a planar, plate shaped cover outer surface spaced from a cover inner face wall by an intermediate cover peripheral edge oriented normal to the cover inner and outer face walls; and iii) wherein the first casing portion is securable to the cover with either the cover outer surface being coplanar with a first peripheral edge of the first surrounding sidewall or the intermediate cover peripheral edge being coplanar with a first outer surface of the first surrounding sidewall; b) a first active material in electrical contact with at least one of the first casing face wall and the cover inner face wall; c) a second active material of an opposite polarity as the first active material; d) a separator intermediate the first and second active materials; e) a glass-to-metal seal supported in at least one of the first and second casing portions to electrically insulate a lead for the second active material from the enclosure serving as a terminal for the first active material; and f) a working electrolyte provided in the enclosure in contact with the first and second active materials.