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. 09, 2025
Filed:
Sep. 09, 2022
Prime Planet Energy & Solutions, Inc., Tokyo, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Primearth Ev Energy Co., Ltd., Kosai, JP;
PRIME PLANET ENERGY & SOLUTIONS, INC., Tokyo, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
PRIMEARTH EV ENERGY CO., LTD, Kosai, JP;
Abstract
A secondary battery with a reduced degree of increase in internal pressure over time, is provided. In a preferred embodiment, a secondary battery including: an electrode body, a battery case, an electrode terminal, and a gasket sandwiched between the battery case and the electrode terminal is provided. The secondary battery is configured such that a parameter K calculated using the following equation (1): K=Wi/(VrG) (1) (where Wi represents an initial capacity (Ah) of the secondary battery, Yr represents a volume (cm) of void in the battery case, and G, represents an Hgas permeability coefficient (cm·cm)/(cm·s·cmHg) of the gasket at 60° C.) satisfies 0.43×10or more to 0.59×10or less.