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:
Sep. 08, 2026
Filed:
Oct. 30, 2023
Sumitomo Chemical Company, Limited, Tokyo, JP;
Akihiko Shin, Niihama, JP;
Yuki Yoneguchi, Niihama, JP;
SSLM CO., LTD., Daegu, KR;
Abstract
Provided is a nonaqueous electrolyte secondary battery separator capable of satisfactorily maintaining ion permeability even after being compressed. The nonaqueous electrolyte secondary battery separator includes a polyolefin porous film in which an average of inclination angles of major axes of voids extracted from a two-dimensional image of a cross section of the polyolefin porous film is not less than 7.0, the inclination angles being calculated from respective circumscribed rectangles of the voids, the two-dimensional image being obtained by use of SEM, and the cross section being formed by cutting the polyolefin porous film (i) along a straight line that passes a center of a surface of the polyolefin porous film and is parallel to an MD or a TD and (ii) in a direction perpendicular to the surface.