THERMOFORMED FILM VENT FOR GALVANIC CELLS

摘要

A sealed galvanic cell comprising a container (30) having a base, an upstanding wall (32) and an open end defined by the upstanding wall (32); a cover (4) having a peripheral sealing portion (14), a top surface (5), and an undersurface (7) including a nonsealing area, the cover (4) having at least one vent aperture (8) through the top surface (5) and the nonsealing area of the undersurface (7); the cover (5) being disposed over and secured to the open end of the container (30) with a gasket (34) positioned between the open end of the container (30) and the peripheral sealing portion (14) of the cover (4); and a thermoformed film member (6) disposed adjacent to the nonsealing area of the undersurface (7) of the cover (4) and extending across the at least one vent aperture (8), the periphery (20) of the thermoformed film member (6) being retained between the cover (4) and the container (30).