Battery in a vacuum sealed enveloping material and a process for making the same

A battery assembly comprising:

• a laminar battery having an anode layer, a cathode layer and an ionically conductive electrolyte layer separating said anode an d cathode layers to form an electrical cell;
• an elongate anode terminal connected to said anode layer;
• a cathode terminal connected to said cathode layer;
• a first layer of electrically insulating adhesive, heat-sealable material capable of adhering to said anode terminal contiguous with and enveloping said cell such that said anode and cathode terminals protrude therefrom;
• a second layer of an insulating and heat-sealable thermoplastic material, selected from the group consisting of polyethylene and polypropylene, contiguous with and totally enclosing said first layer;
• a third layer of a metal foil contiguous with and totally enclosing said second layer, said third layer being electrically insulated from said cell by said first and second layers;
• and
• a fourth layer of a nonconductive thermoplastic material having a higher melting point than said first and second layers contiguous with and totally enclosing said third layer, whereby said layers are heat sealed about a periphery of said battery, said anode and cathode terminals protruding from a heat sealed seam thereof and being electrically isolated from said second, third and fourth layers.