Robert A Mccormick

US Patent:

41661575, Aug 28, 1979

Filed:

Jul 31, 1978

Appl. No.:

5/929286

Inventors:

Robert J. McCormick - Westfield NJ

Assignee:

Exxon Research & Engineering Co. - Florham Park NJ

International Classification:

H01M 208

US Classification:

429174

Abstract:

A novel button cell having a corrosion resistant can and being double sealable is described. The cell is basically made of four components, a conductive metal can, a conductive thermoplastic layer in the can, a conductive metal cover and a dielectric thermoplastic gasket molded around the cover. The conductive thermoplastic layer is disposed on the inner surfaces of the can so as to extend over at least all of the inner surface of the bottom of the can. The conductive metal cover has a sidewall which includes a U-shape configuration, and the dielectric thermoplastic gasket is insert molded around the sidewall of the cover and a part of the top of the cover so as to extend over all surfaces of the cover except a center portion, inner and outer surfaces, of the top of the cover. The dielectric thermoplastic gasket has a tapered projection located below the U-shape configuration. The combination of the conductive metal cover and the dielectric thermoplastic gasket has a total height which is less than the height of the sidewall of the can and is adapted so as to cooperate with and fit into the can.