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:
Mar. 06, 2012
Filed:
Feb. 01, 2007
Applicants:
Yasushi Hirakawa, Osaka, JP;
Takayuki Shirane, Osaka, JP;
Inventors:
Yasushi Hirakawa, Osaka, JP;
Takayuki Shirane, Osaka, JP;
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01M 4/13 (2010.01);
U.S. Cl.
CPC ...
Abstract
A positive electrode plate and a negative electrode plate are spirally wound with a separator interposed therebetween to form an electrode grouphaving a circular shape or an oval shape. Next, a center core memberfor applying a pressure to the electrode groupis inserted in a winding core holeof the electrode group. Thereafter, the electrode groupis deformed into a flat shape. Then, the flat electrode groupis accommodated in a rectangular flat armoring canwith a base and an opening portion of the armoring canis sealed, thereby producing a rectangular flat secondary battery.