US 12,080,489 B2
Electrode foil for electrolytic capacitor, electrolytic capacitor, and methods for producing them
Mitsuhisa Yoshimura, Osaka (JP); Shosuke Nakano, Osaka (JP); Hiroshi Yoshida, Kyoto (JP); Masami Tsubaki, Kyoto (JP); Naomi Kurihara, Osaka (JP); and Miwa Ogawa, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/434,263
Filed by PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
PCT Filed Oct. 30, 2019, PCT No. PCT/JP2019/042681
§ 371(c)(1), (2) Date Aug. 26, 2021,
PCT Pub. No. WO2020/174751, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 2019-037029 (JP), filed on Feb. 28, 2019.
Prior Publication US 2022/0148815 A1, May 12, 2022
Int. Cl. H01G 9/055 (2006.01); H01G 9/00 (2006.01); H01G 9/145 (2006.01)
CPC H01G 9/055 (2013.01) [H01G 9/0032 (2013.01); H01G 9/145 (2013.01)] 24 Claims
OG exemplary drawing
 
1. An electrode foil for an electrolytic capacitor, comprising:
a metal porous portion; and a metal core portion continuous to the metal porous portion, wherein
when the metal porous portion is equally divided in three in a thickness direction of the metal porous portion into a first region, a second region, and a third region sequentially from the metal core portion side, the first region has a porosity P1, the second region has a porosity P2, and the third region has a porosity P3, satisfying P1<P2<P3 and P2/P1<P3/P2.