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:
Jan. 24, 2012
Filed:
Mar. 27, 2008
Shouichiro Sawa, Moriguchi, JP;
Taizou Sunano, Moriguchi, JP;
Maruo Kamino, Moriguchi, JP;
SANYO Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
A lithium secondary battery has a wound electrode assembly (). The wound electrode assembly () has a negative electrode () having a negative electrode active material layer containing a negative electrode active material capable of alloying with lithium and having a filling density of 2.0 g/cc or less, a positive electrode () having a positive electrode active material layer containing a positive electrode active material made of a transition metal composite oxide, a separator () disposed between the positive and negative electrodes and having a penetration resistance of 500 g or greater, and a cylindrical hollow space () at a winding axis and in the vicinity thereof, wherein the positive electrode (), the negative electrode (), and the separator () are spirally wound. A columnar center pin () having a diameter of from 75% to 95% of the diameter of the hollow space is disposed in the hollow space.