| abstract |
[Problem] To provide a battery packaging material in which a wavy shape does not remain at an end portion after molding, and the occurrence of poor sealing can be effectively suppressed. A battery packaging material 10 in which at least a base material layer, a metal layer, and a sealant layer are sequentially laminated, The thickness of the metal layer is 30 μm or less, the end in the width direction x has a undulating shape along the longitudinal direction y, and peaks and troughs constituting the undulating shape of the end In the repetition, the straight line distance a connecting the vertices p1 and p2 of two continuous valleys, and the shortest distance b connecting the vertices q of the peak located between the two continuous valleys and the straight line, The battery packaging material satisfying the relationship of b / a ≦ 2.0. [Selection] Figure 1 |