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:
Apr. 13, 2021
Filed:
Apr. 17, 2019
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Akira Kano, Osaka, JP;
Ryohei Miyamae, Osaka, JP;
Kiyohiro Isii, Osaka, JP;
Kensuke Nakura, Osaka, JP;
Abstract
A lithium secondary battery includes an electrode group and a nonaqueous electrolyte having lithium ion conductivity. A negative electrode includes a negative electrode current collector. The negative electrode current collector has a first surface facing an outward direction of winding of the electrode group and a second surface facing an inward direction of the winding of the electrode group. Lithium metal is deposited on the first surface and the second surface by charge. The negative electrode further includes first protrusions protruding from the first surface and second protrusions protruding from the second surface. A ratio A/Ais less than a ratio A/A. Ais a sum of projected areas of the first protrusions on the first surface. Ais an area of the first surface. Ais a sum of projected areas of the second protrusions on the second surface. Ais an area of the second surface.