Patent ID: 8383257

Claim:
An electrochemical storage cell comprising: a core comprising at least one cathode sheet, at least one anode sheet and at least one separator sheet; a rectangular shell with four sides and two open ends; an end cap assembly corresponding to each of the open ends, respectively; each end cap assembly having a cover plate configured to be secured to the rectangular shell to seal the respective open end of the shell; each end cap assembly including a blow-out assembly mounted on the end cap assembly, the blow out assembly including a single-use blow out vent configured to destructively open and release pressure from within the rectangular shell when the pressure within the rectangular shell exceeds a predetermined level to thereby prevent catastrophic rupture of the shell; and wherein the blow-out assembly includes a vent cover, a rupture pin, a vent base, and a plurality of exhaust openings disposed through the sides of the vent cover.