Thin type battery

A thin type battery comprising:

• (1) a first container having a first opening in an upper surface,
• (2) an electrode contained in said first container,
• (3) an electrolyte contained in said first container, and
• (4) a sealing member,
• wherein said sealing member comprises:
• (a) a second container made of metal having a penetration hole in a bottom surface, a periphery, and a second opening in an upper surface,
• (b) a lower valve disc of conductive property disposed on said bottom surface of said second container, said lower valve disc having an upper surface, a first peripheral edge and including a first thin wall section corresponding to said penetration hole,
• (c) an electric insulating gasket disposed on said upper surface of said lower valve disc, and extending peripherally along said upper surface and having a second peripheral edge,
• (d) an upper valve disc of conductive property disposed on said electric insulating gasket, and having a third peripheral edge, and
• (e) a cap-shaped terminal of conductive property disposed upon said upper valve disc, and within said second opening, and including a fourth peripheral edge,
• wherein the periphery of said second container seals said second container by coupling together said first peripheral edge, said second peripheral edge, said third peripheral edge, and said fourth peripheral edge, said upper valve disc and said cap-shaped terminal contacting each other electrically, said cap-shaped terminal and said second container electrically insulated from each other, and said lower valve disc and said second container contacting each other electrically, and,
• wherein said upper valve disc and said lower valve disc are joined electrically at a junction connecting said first thin wall section and a first region of said upper valve disc, and
• wherein said first thin wall section including said junction is torn and separated from said lower valve disc at said junction when the pressure in said first container reaches a specified value, so that said upper valve disc and said lower valve disc are electrically isolated from each other.