US 12,002,965 B2
Aluminum foil
Hirokazu Sawada, Haibara-gun (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Feb. 18, 2022, as Appl. No. 17/675,160.
Application 17/675,160 is a continuation of application No. PCT/JP2020/029872, filed on Aug. 4, 2020.
Claims priority of application No. 2019-151932 (JP), filed on Aug. 22, 2019.
Prior Publication US 2022/0173407 A1, Jun. 2, 2022
Int. Cl. H01M 4/76 (2006.01); H01M 4/66 (2006.01)
CPC H01M 4/762 (2013.01) [H01M 4/661 (2013.01); H01M 4/765 (2013.01); Y10T 428/12479 (2015.01)] 17 Claims
OG exemplary drawing
 
1. A long aluminum foil comprising:
in a width direction orthogonal to a longitudinal direction,
a perforated portion;
two non-perforated portions, each provided separately at both ends of the long aluminum foil in the width direction; and
a hole density decreasing portion between the perforated portion and each of the two non-perforated portions,
wherein the perforated portion has a plurality of through-holes penetrating therethrough in a thickness direction,
the two non-perforated portions do not have a through-hole,
the hole density decreasing portions have a plurality of through-holes penetrating therethrough in the thickness direction and a plurality of non-through-holes that do not penetrate, and
in the hole density decreasing portions, an opening ratio due to the through-holes gradually decreases from a perforated portion side to a non-perforated portion side.