NOVELTY - The battery packing material (1) has a laminate (20) of a biaxially stretched nylon film (21) provided on one surface of an aluminum foil (24) and a heat bondable resin layer (26) provided as the outermost layer on the other surface. A chemical conversion treatment layer (23) is provided on the surface(s) of the aluminum foil through an adhesive layer (22,25). The nylon film has a thickness of 12-40 microns and the aluminum foil has a thickness of 20-100 microns. The nylon film has a breaking-point elasticity of 90-120% in the transverse direction.    USE - For battery containers (claimed) of lithium cells.    ADVANTAGE - The battery packing material has excellent moldability, pinhole resistance, water-vapor barrier property and crack resistance. The stress concentration by heterogeneous deformation produced in the packing material is suppressed.    DETAILED DESCRIPTION - The battery packing material (1) of press-formed type has a laminate (20) of a biaxially stretched nylon film (21) provided on one surface of an aluminum foil (24), and a heat-bondable resin layer (26) provided as the outermost layer on the other surface of the aluminum foil. A chemical-conversion treatment layer (23) is provided on the surface(s) of the aluminum foil through an adhesive layer (22,25). The nylon film has a thickness of 12-40 microns and contains nylon 6, and the aluminum foil has a thickness of 20-100 microns. The nylon film has a breaking-point elasticity of 90-120% in the transverse direction, and the breaking-point elasticity in the machine direction is larger than that in the transverse direction by 25% or more. The elasticity is measured using a test sample having a width of 15 mm, at a tensile velocity of 500 mm/minute and a distance of 100 mm from a reference point.    An INDEPENDENT CLAIM is included for battery container.    DESCRIPTION OF DRAWING(S) - The figure shows the lamination of the battery packing material.    Battery packing material (1)    Laminate (20)    Nylon film (21)    Adhesive layer (22,25)    Chemical conversion treatment layer (23)    Aluminum foil (24)    Heat-bondable resin layer (26)