PERFORATED FILM, COATING FILM, AND ELECTRICITY STORAGE DEVICE

摘要

Tensile strength in a width direction and a longitudinal direction is improved without damaging a ventilation characteristic. A perforated film 1 is a perforated film provided with holes 11, each of the holes 11 is arranged at an intersection of a plurality of virtual lines VL1 extending along a direction D1 and a plurality of virtual lines VL2 extending along a direction D2, and the direction D1 is different from the width direction and the longitudinal direction. The direction D1 and the direction D2 may be both inclined at an angle larger than 30° and smaller than 60° to the width direction.