NOVELTY - The packaging material is a laminate of base layer (11), adhesive layer, aluminum layer (12), formation-treatment layer (15), adhesion resin layer (13) and polypropylene resin-based sealant layer (14). Layer (13) contains resin blend having melt index of 7.25 g/10 minutes, obtained by blending two or more polypropylene resins having different melt indices.    USE - For packaging battery (claimed) e.g. polymeric polymer electrolyte battery, lithium ion battery, fuel cell and capacitor.    ADVANTAGE - The corrosion of aluminum resulting from microcracks in the adhesion resin layer, is prevented in the battery packaging material due to resin blend. The delamination of base material and aluminum during emboss molding and heat sealing is prevented by providing formation-treatment layer on both surfaces of aluminum layer. The adhesion stabilizing treatment provided to the laminate of battery packaging material, prevents delamination due to hydrofluoric acid produced by reaction of electrolyte liquid leaked from the battery and water content. The laminate structure of the battery packaging material has favorable retention resistance and damp-proofing property. The productivity of battery packaging material is improved.    DETAILED DESCRIPTION - The packaging material is a laminate of base layer (11), adhesive layer, aluminum layer (12), formation-treatment layer (15), adhesion resin layer (13) and polypropylene resin-based sealant layer (14). Layer (13) contains resin blend having melt index of 7.25 g/10 minutes, obtained by blending two or more polypropylene resins having different melt indices. The battery is inserted in the packaging material and the peripheral portion of the material is heat-sealed.    An INDEPENDENT CLAIM is included for battery.    DESCRIPTION OF DRAWING(S) - The figure shows the sectional drawings of lamination of battery packaging material and separate lamination of battery packaging material.    Base material layer (11)    Aluminum layer (12)    Adhesion resin layer (13)    Polypropylene-based sealant layer (14)    Formation-treatment layer (15)