The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 12, 2019
Filed:
Jul. 22, 2015
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Nippon Steel & Sumikin Materials Co., Ltd., Tokyo, JP;
Masaharu Ibaragi, Kisarazu, JP;
Koichi Nose, Chiba, JP;
Kiyokazu Ishizuka, Himeji, JP;
Yasuto Goto, Kimitsu, JP;
Shuji Nagasaki, Sagamihara, JP;
Hiroto Unno, Yokohama, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
NIPPON STEEL & SUMIKIN MATERIALS CO., LTD., Tokyo, JP;
Abstract
A steel foil for a power storage device container includes a rolled steel foil, a nickel layer formed on a surface of the rolled steel foil, and a chromium-based surface treatment layer formed on a surface of the nickel layer. The nickel layer includes an upper layer portion which is in contact with the chromium-based surface treatment layer and contains Ni of 90 mass % or more among metal elements, and a lower layer portion which is in contact with the rolled steel foil and contains Ni of less than 90 mass % among the metal elements and Fe. <111> polar density in a reverse pole figure of the nickel layer in a rolling direction is 3.0 to 6.0. The nickel layer has a sub-boundary which is a boundary between two crystals having a relative orientation difference of 2° to 5°, and a large angle boundary which is a boundary between two crystals having the relative orientation difference of equal to or more than 15°. The average value of a ratio L/Lbetween a boundary length Lwhich is the length of the sub-boundary, and a boundary length Lwhich is the length of the large angle boundary, is equal to or more than 1.0.