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:
Aug. 10, 2010
Filed:
Nov. 19, 2007
Takayuki Mitani, Hitachinaka, JP;
Katsunori Suzuki, Nabari, JP;
Takayuki Mitani, Hitachinaka, JP;
Katsunori Suzuki, Nabari, JP;
Hitachi Vehicle Energy, Ltd., Ibaraki, JP;
Abstract
A cylindrical secondary battery where safety can be secured even when an external pressure accompanying rapid deformation of the battery acts on the battery is provided in a battery having a large capacity. A lithium ion secondary battery has a capacity of 14 Ah, where an upper lid is fixed to a battery can which receives an electrode winding grope therein. The upper lid includes a diaphragmformed with a rupturing valve and an upper lid cap whose peripheral edge portion is fixed to a peripheral edge portion of the diaphragm. The rupturing valve includes a rupturing groovewith a V-shaped section formed on a surface of the diaphragmpositioned on the side of the upper lid cap and a rupturing groovewith a U-shaped section formed on a surface of the diaphragmpositioned on the side of the electrode winding group so as to correspond to the position of the rupturing groove