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An improved lid for closing the open end of a casing of an electrochemical energy storage device is described. The improved lid comprises a flat region having spaced apart upper and lower planar surfaces joined by a peripheral edge, an angled transition forming a boss protruding from the lower surfa

An improved lid for closing the open end of a casing of an electrochemical energy storage device is described. The improved lid comprises a flat region having spaced apart upper and lower planar surfaces joined by a peripheral edge, an angled transition forming a boss protruding from the lower surface, and a bore extending through the boss to the upper surface. An electrical energy storage device is also described, which includes the improved lid secured to the open end of the casing container of the device.

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What is claimed is: 1. An electrical energy storage device, which comprises:a) a container having a surrounding sidewall providing an opening leading into the container;b) an electrode assembly comprising an anode, a cathode and an intermediate separator disposed inside the container;c) a lid secure

What is claimed is: 1. An electrical energy storage device, which comprises:a) a container having a surrounding sidewall providing an opening leading into the container;b) an electrode assembly comprising an anode, a cathode and an intermediate separator disposed inside the container;c) a lid secured to the open end of the container to provide a casing housing the electrode assembly, the lid having:i) a thickness of from about 0.020 inches to about 0.050 inches extending between spaced apart upper and lower planar surfaces joined by a peripheral edge,ii) a transition surface forming a boss protruding from either the upper or the lower planar surface, wherein the transition surface has a frusto-conical shape extending at an angle greater than 90° to 160° from a first end of the transition surface at the one of the upper and lower planar lid surface to a second end of the transition surface connected directly to a planar shoulder, andiii) wherein the planar shoulder has a width of from one-half to five times the lid thickness and extends from the transition surface to an annular perimeter surface defining a bore extending through the boss to the other of the upper and lower planar surface thereof;d) a terminal lead connected to one of the anode and the cathode and extending through the bore to a position spaced above the upper surface of the lid;e) a glass in direct sealing contact with the terminal lead and the bore of the boss to thereby provide the terminal lead in an insulated relationship with respect to the casing; andf) an electrolyte provided in the casing to activate the anode and cathode electrodes.