Patent ID: 6977124

Claim:
An electrochemical cell, which comprise: a) a negative electrode; b) a positive electrode; c) a casing housing the negative and positive electrodes, wherein the casing comprises spaced apart first and second major side walls extending to and meeting with opposed third and fourth end walls, the first and second major side walls and the third and fourth end walls extending from a bottom wall to an open end closed by a lid, and wherein the first and second major side walls are continuously curved about their entire extent and in a similar direction from where they connect to the third end wall to where they connect to the fourth end wall and from the bottom wall to the open end, wherein at least one of the first and second major side walls has a first curvature portion transitioning into a second, different curvature portion and wherein both the first and second curvature portions deflect in a similar direction; and d) an electrolyte provided in the casing to activate the negative and positive electrodes.