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. 27, 2022
Filed:
Apr. 26, 2021
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Kunihiko Hayashi, Anjo, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
The present invention provides a technology that allows supplying stably a nonaqueous electrolyte secondary battery having a high capacity retention rate and being excellent in resistance to deterioration. The nonaqueous electrolyte secondary battery disclosed herein is provided with a wound electrode body resulting from winding a stackhaving a stacking of a positive electrodeand a negative electrodeacross separators. The positive electrodehas a foil-shaped positive electrode collectorand a positive electrode mix layer. Each separatorhas a resin substrate layerand a heat resistance layer. In the nonaqueous electrolyte secondary battery disclosed herein, the peel strength of a boundary between the resin substrate layer and the heat resistance layer is 16 N/m or more and 155 N/m or less, and the density of the positive electrode mix layer is 2.3 g/cc or more and 2.6 g/cc or less. In this the nonaqueous electrolyte secondary battery, sufficient flexibility of the stackas a whole can be secured even when using high-peel strength separatorsin order to increase resistance to deterioration. Drops in production efficiency can be suitably suppressed as a result.