Combined safety blow-out and gas permeable membrane for galvanic cells

• US 3,218,197 A
• Filed: 09/20/1963
• Issued: 11/16/1965
• Est. Priority Date: 02/25/1960
• Status: Expired due to Term

• Current Assignee: Robert Carmichael, William A. Vulpio
• Original Assignee: Robert Carmichael, William A. Vulpio
• Inventors: Carmichael, Robert, Vulpio, William A.
• Application Number:
  US04/310,250
• Time in Patent Office: 788 Days
• US Class Current: 429/56
• CPC Class Codes: H01M 50/154 Lid or cover comprising an axial bore for receiving a central current collector
• CPC Class Codes: H01M 50/3425 in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
• CPC Class Codes: H01M 50/394 Gas-pervious parts or elements
• CPC Class Codes: H01M 50/56 Cup shaped terminals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Claims

1. IN A GALVANIC CELL HAVING A CUP-SHAPED CONTAINER AND SEALED IN THE OPEN END OF SAID CONTAINER A CELL CLOSURE COMPRISING AN ANNULAR U-SHAPED SEAL GASKET HAVING A CENTRAL APERATURE THEREIN, A RIGID ANNULAR COVER DISPOSED IN THE U OF SAID GASKET AND HAVING A VENTING APERTURE THEREIN, AND A RIVET EXTENDING THROUGH SAID CENTRAL APERTURE AND COMPRESSING SAID GASKET BETWEEN SAID COVER AND SAID RIVET;

THE IMPROVEMENT WHEREIN SAID SEAL GASKET IS COMPOSED OF A GAS PERMEABLE MATERIAL RESISTANT TO COLD FLOW AND WHEREIN SAID SEAL GASKET HAS AT LEAST ONE COMBINED SAFETY BLOW-OUT AND VENTING MEMBRANCE CONSISTING OF AN INTEGRAL PORTION OF SAID GASKET THINNER THAN ADJACENT AREAS OF SAID GASKET, SAID MEMBRANE BEING SUFFICIENTLY THIN TO EFFECT A RUPTURE AT EXCESSIVE PRESSURES WITHIN SAID CELL.