| abstract |
Provided is a battery packaging material with excellent moldability. It consists of a laminate comprising at least a base material layer, a barrier layer, and a heat-fusible resin layer in this order, At least one layer of the base material layer is formed of a polybutylene terephthalate film, The puncture strength X (N) when pierced from the base material layer side of the laminate measured by a method based on JIS Z1707: 1997 is the thickness Y (μm) of the polybutylene terephthalate film. A battery packaging material having a value obtained by dividing by the square root √Y (√μm) of 3.90 N / √μm or more. |