FILM FOR LEAD WIRE OF BATTERY, PACKAGING MATERIAL FOR BATTERY USING THE SAME, AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a film for lead wire of a battery and packaging material for batteries using it, enabling stably sealing without short-circuiting a barrier layer of outer covering body having a heat seal layer made of polypropylene resin and the lead wire by heat and pressure of the heat seal, when at packaging the battery, a battery body is inserted into the outer covering body and the periphery is heat-sealed for sealing. SOLUTION: A lead wire made of strip-shaped plate or rod-shaped metal is sandwiched at the peripheral seal part made of laminates having heat- sealability on the inner surface. When the peripheral part of the outer covering body is sealed, a film to be interposed between the laminates and the lead wire is a multi-layered film formed with a polypropylene layer on one face of a polyethylene resin layer cross-linked with gel ratio of 5-80% and a layer made of polypropylene denatured by acid on the other face.