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:
Sep. 25, 2007
Filed:
Mar. 10, 2003
Hiroyuki Akita, Kobe, JP;
Kouichi Satoh, Kobe, JP;
Toshiyuki Nohma, Kobe, JP;
Ikuo Yonezu, Kobe, JP;
Hiroyuki Akita, Kobe, JP;
Kouichi Satoh, Kobe, JP;
Toshiyuki Nohma, Kobe, JP;
Ikuo Yonezu, Kobe, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A secondary cell comprises an electrode unit housed in a cell can comprising a cylinder having a bottom and a closed opening, and a current collector plateis provided at one end of the electrode unit. The current collector platehas a plurality of protrusionsextending radially thereof and joined to an edge of the electrode unit. The surface of the current collector plateto be joined to the bottom wall of the cylinder has a flat region R extending on a predetermined closed-loop track on the surface, and the portions of the current collector plateand the cylinder to be joined are subjected along the flat region R to laser welding from outside the cylinder.