| abstract |
Provided is a packaging material for a battery, said packaging material being able to ensure safety even when an increase in pressure or temperature within the battery has persistently progressed. A packaging material for a battery, said packaging material being composed from a layered body that comprises at least a substrate layer, a barrier layer, an adhesive layer, and a thermally fusible resin layer, in this order, wherein according to a thermomechanical analysis that measures the amount of displacement of a probe, where the probe is positioned on a surface of the adhesive layer in a cross-section of the layered body, the measured value of deflection of the probe at the start of measurement is -4V, and the temperature increase speed is 5°C/min, when the probe is heated under these conditions from 40°C to 220°C, the temperature at which the location of the probe falls below an initial value is 130°C or less. |