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:
Dec. 29, 2009
Filed:
Aug. 30, 2005
Hideaki Fujita, Hannan, JP;
Tsuyoshi Hatanaka, Naga-gun, JP;
Tetsuya Hayashi, Kadoma, JP;
Akira Nagasaki, Neyagawa, JP;
Yusuke Fukumoto, Moriguchi, JP;
Kohei Suzuki, Yao, JP;
Hideaki Fujita, Hannan, JP;
Tsuyoshi Hatanaka, Naga-gun, JP;
Tetsuya Hayashi, Kadoma, JP;
Akira Nagasaki, Neyagawa, JP;
Yusuke Fukumoto, Moriguchi, JP;
Kohei Suzuki, Yao, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A lithium ion secondary battery including: an electrode group including a belt-like positive electrode and a belt-like negative electrode that are wound with a separator interposed therebetween; and a can with a bottom for accommodating the electrode group, wherein the positive electrode has a positive electrode current collector and a positive electrode mixture layer carried on the positive electrode current collector, the negative electrode has a negative electrode current collector and a negative electrode mixture layer carried on the negative electrode current collector, and a porous heat-resistant layer is partially provided between the separator and at least one of the positive electrode mixture layer and the negative electrode mixture layer. Since a porous heat-resistant layer is thus placed, a high performance lithium ion secondary battery capable of efficiently preventing internal short circuit due to overheating while preventing decrease in battery characteristics can be provided.