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. 26, 2012
Filed:
Nov. 01, 2005
Takeshi Meguro, Fukushima, JP;
Yoshihiro Dokko, Fukushima, JP;
Hiroyuki Suzuki, Fukushima, JP;
Tadashi Miebori, Fukushima, JP;
Shinji Hatake, Fukushima, JP;
Yuzuru Fukushima, Miyagi, JP;
Takeshi Meguro, Fukushima, JP;
Yoshihiro Dokko, Fukushima, JP;
Hiroyuki Suzuki, Fukushima, JP;
Tadashi Miebori, Fukushima, JP;
Shinji Hatake, Fukushima, JP;
Yuzuru Fukushima, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A battery with improved safety that can more surely short-circuit electrodes when flattened out by the external force is provided. A center pin () is inserted in the center of a spirally wound electrode body formed by layering and spirally winding a cathode and an anode with a separator in between. The center pin () has a cut line () provided in the longitudinal direction and a first cutout () vertically crossing the cut line (). When flattened out by the external force, a corner () at an intersection of the cut line () and the first cutout () is projected, and short-circuit is surely generated. Further, it is preferable that the center pin () has a second cutout () in the direction perpendicular to the cut line () in a position facing the cut line () in the circumferential direction. It is also preferable that the center pin () has a cross sectional shape of an oval or an ellipse, and the cut line () is provided in a position where the diameter of the oval or the ellipse is the largest.