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:
Aug. 15, 2023
Filed:
Sep. 09, 2021
Prime Planet Energy & Solutions, Inc., Tokyo, JP;
PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo, JP;
Abstract
The secondary battery includes: a square battery case; and a wound electrode body accommodated in the battery case. The wound electrode body has a positive electrode sheet and a negative electrode sheet overlapping with each other to be wound about a winding axis to have a rectangular shape when seen from a winding axis direction. The wound electrode body has corner parts positioned at four corners of the wound electrode body when seen from the winding axis direction. The positive electrode sheet has a positive electrode collector and a positive electrode active material layer. The negative electrode sheet has a negative electrode collector and a negative electrode active material layer. Folding grooves are formed along the winding axis direction at portions of the positive electrode active material layer or portions of the negative electrode active material layer that are positioned at the corner parts.