Abstract: Leakage resistance in electrochemical cells is improved by the utilization of an elastomeric modified asphalt sealant material disposed between an insulative cell top and the cell container.

Abstract: A leak resistant non-tacky sealant for electrochemical cells which is particularly suited for high speed manufacturing processes comprised of a solvent castable, film forming, thermoplastic material with a polymeric binder which is in the liquid state at room temperature. The thermoplastic material and the liquid polymeric binder are mixed by dissolving both in a common solvent. The liquid polymeric binder is present in a maximum amount of 45% by weight of the sealant mixture.

Abstract: In a sealed cell having an anode, a cathode, and a cylindrical can into which the principal components of the cell are assembled, a sealing and insulating member (seal) is provided at the open end of the can, and is held in sealing relationship with the can by a crimp formed over the top edge thereof. The seal may be formed so as to have a downwardly depending skirt in its lower portion; generally in the manner of a plurality of leg-like projections, usually three. Across the upper surface of the member, and over an upwardly directed and centrally located nail boss in the upper surface, there is placed a metal disc having a centrally located opening which is in interference fit with the outside periphery of the nail boss, and having a passage formed therein for pressure equalization of the space between the plastic body and the metal disc to the outside of the cell. There is an upwardly extending skirt formed around the outer periphery of the member.

Abstract: In a sealed galvanic cell having an anode, cathode, and cylindrical can into which the principal components of the cell are assembled, a sealing and insulating member at the top end of the cathode can is provided which is held in sealing relationship to the can by a crimp formed over the top edge thereof. The sealing and insulating member has a circular rim formed at its periphery in at least one of the top and bottom surfaces, the diameter of the sealing and insulating member being substantially the same as the inside diameter of the can above a bead which is formed near the top edge thereof. At least a portion of the thickness of the peripheral material of the member is stressed by the crimp in an amount greater than the elastic limit of the material, and at least another portion of the thickness of the peripheral material of the sealing and insulating member is stressed in an amount less than the elastic limit. The stressed portion is at the top or bottom of the periphery of the member.