Patent ID: 7074516

Claim:
An electrochemical cell having a negative terminal end, comprising: (a) a cylindrical container having an upstanding sidewall presenting an inner and outer surface and a terminal end proximal the negative terminal end of the cell, the container defining a vent extending therethrough; (b) an annular cathode ring disposed within the container, the cathode ring having an inner peripheral sidewall; (c) an ionically permeable separator having an outer surface disposed adjacent the inner peripheral sidewall of the cathode ring and an inner surface defining a central cylindrically shaped void, the container inner surface and the separator outer surface defining a cathode chamber; (d) an anode disposed in the central cylindrically shaped void; (e) a negative current collector electrically connected to the anode and closed at its axially outer end by a negative endplate; and (f) a gasket that extends radially from the negative current collector to the container sidewall, wherein the container is crimped about the gasket to provide a seal therebetween that is removed when internal cell pressure exceeds a predetermined threshold to enable electrolyte to flow out of the cell, the electrolyte being in fluid communication with the vent when the internal cell pressure is greater than the predetermined threshold.