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:
Feb. 07, 2006
Filed:
Dec. 22, 2003
Naoya Nakanishi, Tondabayashi, JP;
Kouichi Satoh, Itami, JP;
Toshiyuki Nohma, Hirakata, JP;
Ikuo Yonezu, Hirakata, JP;
Naoya Nakanishi, Tondabayashi, JP;
Kouichi Satoh, Itami, JP;
Toshiyuki Nohma, Hirakata, JP;
Ikuo Yonezu, Hirakata, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A nonaqueous electrolyte secondary cell comprises a rolled-up electrode unitcomposed of a positive electrode, a negative electrodeand a separatorinterposed therebetween, and a negative electrode current collector plateand a positive electrode current collector platejoined to the respective ends of the electrode unit. The negative electrode collector plateis joined to an edge of the negative electrodeprojecting at one of the opposite ends of the electrode unit. The collector platehas a two-layer structure comprising a copper layermade of copper or an alloy consisting predominantly of copper, and a metal layer made of a metal not forming an intermetallic compound with lithium and having a lower laser beam reflectivity than copper or an alloy consisting predominantly of the metal. The collector platehas its copper layercontacted with the edge of the negative electrodeand welded thereto with a laser beam. This improves the weldability of the collector plateto the rolled-up electrode unitto achieve a high current collecting efficiency.