Patent ID: 8734983

Claim:
A housing for an electrochemical device comprising a plurality of electrodes, the housing comprising: (a) a first cup, the first cup defining (1) a first flat surface having a circumferential edge; and (2) a first wall, the first wall extending from the first flat surface along the circumferential edge; (b) a second cup, not identical to the first cup, the second cup defining (1) a second flat surface having a circumferential edge; and (2) a second wall, the second wall extending from the second flat surface along the circumferential edge, wherein the first cup and the second cup combine to form a disc-shaped enclosure, wherein the enclosure seals the electrodes from an ambient atmosphere; and (c) a fastener, wherein the fastener attaches the first cup to the second cup and the fastener is located between the first flat surface of the first cup and second flat surface of the second cup at the center of each cup, wherein the fastener extends in the same direction as the first and second walls, and wherein the plurality of electrodes encircles the fastener.