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. 24, 2021
Filed:
Feb. 07, 2019
Sanyo Electric Co., Ltd., Daito, JP;
Taiki Nonaka, Hyogo, JP;
SANYO Electric Co., Ltd., Daito, JP;
Abstract
A nonaqueous electrolyte secondary battery that is an example of an embodiment includes a flat electrode body that has a winding structure in which a positive electrode and a negative electrode are wound with a separator interposed in between, in which flat portions and bend portions are formed in the flat electrode body. A negative electrode mixture layer is provided in the negative electrode to a winding outer end thereof. The negative electrode includes an extension portion that extends out from a winding outer end of the positive electrode towards a winding direction outer side. A length L of the extension portion in a winding direction satisfies a condition L/((a−b)×2+bπ)>0.135, where a is a width of the electrode body and b is a thickness of the electrode body.