20160087279 | PERFORATED FILM, COATING FILM, AND ELECTRICITY STORAGE DEVICE - Tensile strength in a width direction and a longitudinal direction is improved without damaging a ventilation characteristic. A perforated film is a perforated film provided with holes, each of the holes is arranged at an intersection of a plurality of virtual lines extending along a direction and a plurality of virtual lines extending along a direction, and the direction is different from the width direction and the longitudinal direction. The direction and the direction may be both inclined at an angle larger than 30° and smaller than 60° to the width direction. | 03-24-2016 |