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:
May. 12, 2020
Filed:
Sep. 28, 2017
Envision Aesc Japan Ltd., Zama-shi, Kanagawa, JP;
Envision AESC Japan Ltd., Zama-shi, Kanagawa, JP;
Abstract
A secondary battery suppresses generation of wrinkle at the outer peripheral edge portion of a negative electrode plate due to expansion of a negative electrode active material layer with use. The secondary battery includes a positive electrode plate with a positive electrode active material layer disposed on a first current collector, and a negative electrode plate with a negative electrode active material layer having an area larger than an area of the positive electrode active material layer disposed on a second current collector. The negative electrode plate includes a facing portion facing the positive electrode active material layer and a non-facing portion. The negative electrode plate and a separator are bonded through a bonding layer. The bonding strength of a second bonding portion that bonds the non-facing portion to the separator is larger than the bonding strength of a first bonding portion that bonds the facing portion to the separator.