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, 2014
Filed:
Feb. 17, 2011
Yutaka Sato, Hitachinaka, JP;
Takuro Tsunaki, Mito, JP;
Ryuji Kohno, Mito, JP;
Takashi Sasaki, Hiratsuka, JP;
Yutaka Sato, Hitachinaka, JP;
Takuro Tsunaki, Mito, JP;
Ryuji Kohno, Mito, JP;
Takashi Sasaki, Hiratsuka, JP;
Hitachi Vehicle Energy, Ltd., Hitachinaka-shi, JP;
Abstract
A secondary battery includes a gas release valve located at a battery container housing a power generating element, wherein: the gas release valve includes a valve disk caused to expand outward by internal pressure in the battery container; wherein a plurality of grooves are formed at the valve disk in order that a plurality of valve element pieces become fractured along the grooves when the valve disk expands due to the internal pressure; and a scatter-deterring portion is formed at the valve disk in order to prevent the fractured valve element pieces along the grooves from scattering away from the valve disk.