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:
Jun. 17, 2025
Filed:
Feb. 17, 2022
Prime Planet Energy & Solutions, Inc., Tokyo, JP;
PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo, JP;
Abstract
According to the present disclosure, a secondary battery capable of inhibiting precipitation of metallic lithium is provided. A secondary battery disclosed herein includes a wound electrode body, and a battery case. An insufficiently stacked region is formed in the vicinity of a positive electrode starting end portion in a flat portion of the electrode body. In the insufficiently stacked region, the total number of layers of a positive electrode plate and a negative electrode plate is smaller than in other regions in the flat portion. In addition, in the secondary battery, a protruding portion protruding toward at least a part of the insufficiently stacked region is formed on an inner surface of the battery case. As a result, it is possible to prevent pressing failure in the insufficiently stacked region and inhibit precipitation of metal Li due to a local increase in an inter-electrode distance.