Packaging material for a battery, a battery, and a process for their preparation

At least, the steps of providing a substrate layer, a metal layer, a battery packaging material comprising a laminate in which the sealant layer are sequentially comprising a polyolefin resin, From the absorption spectra obtained by dispersing the reflected light when irradiated with infrared rays on the surface of the sealant layer, and the peak intensity P of 1650 cm Comprising a method for manufacturing a battery packaging material.