ELECTROCHEMICAL CELL HAVING A MOISTURE BARRIER

摘要

An electrochemical cell according to the present invention includes a can having an open end; electrochemical materials including two electrodes provided inside the can; a seal provided in the open end of the can for preventing leakage of the electrochemical materials from the can; and a moisture barrier provided in the open end of the can between the seal and the vented outer cover for preventing ambient air from entering the can. Preferably, the ambient air barrier includes a metal inner cover having at least one aperture. The ambient air barrier may further include a plug material disposed in contact with the metal inner cover for releasably plugging the aperture in the metal inner cover. Alternatively, the ambient air barrier may include a layer of air-impervious material disposed on the outer surface of the seal in an area exposed to ambient air passing at least partially through the aperture in the inner cover.