Thin electrolytic capacitor manufacture

Claim 1

The method of producing a flat electrolytic capacitor section with a vapor barrier comprising the steps of winding anode and cathode foils with interleaved spacers and attaching electrode tabs to form a capacitor section and partially flattening said section, impregnating with electrolyte, and compressing said section to complete the flattening and squeeze out excess electrolyte, then thermally sealing said section in a heat sealable vapor-barrier material chosen from the group consisting of films of polyester, perfluoroethylene, cellophane, polyolefin, and laminates thereof with aluminum foil in the form of a polymer-foil-polymer laminate, said heat-sealable material being adhesive-coated, said sealing being attained by placing said section between layers of said heat sealable material, said electrode tabs extending beyond said section and beyond the edges of said heat sealable material, said heat sealable material enveloping said section and extending to a point on said tabs short of the site of a tab-lead connection, placing an adhesive between said tabs and that portion of said heat sealable material adjacent said tabs, and heat-sealing said heat sealable material at least all around the periphery of said section including said tabs to provide a sealed section having said vapor barrier.

Claim 2

The method of producing a flat electrolytic capacitor section with a vapor barrier comprising the steps of winding anode and cathode foils with interleaved spacers and attaching electrode tabs to form a capacitor section and partially flattening said section, impregnating with electrolyte, and compressing said section to complete the flattening and squeeze out excess electrolyte, then thermally sealing said section in a heat sealable vapor-barrier material chosen from the group consisting of films of polyester, perfluoroethylene, cellophane, polyolefin, and laminates thereof with aluminum foil in the form of a polymer-foil-polymer laminate, said heat-sealable material being adhesive-coated, said sealing being attained by placing said section between layers of said heat sealable material, said electrode tabs extending beyond said section and beyond the edges of said heat sealable material, said heat sealable material enveloping said section and extending to a point on said tabs short of the site of a tab-lead connection, placing an adhesive between said tabs and that portion of said heat sealable material adjacent said tabs, and heat-sealing said heat sealable material at least all around the periphery of said section including said tabs to provide a sealed section having said vapor barrier.