A battery packaging material capable of securing safety even when the pressure or temperature in the battery continues to rise. At least, as a battery packaging material comprising a laminate having a base layer, a metal layer, and a sealant layer in this order, when the battery packaging material is heat-sealed to heat up the battery element in a sealed state, the metal layer and the metal layer while maintaining the sealed state After peeling occurs in at least a portion between the outer surfaces of the sealant layer, the battery packaging material is operated to transition to an open state.
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