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. 11, 2011
Filed:
Jan. 23, 2008
Kinya Aota, Hitachi, JP;
Kenji Nakai, Fukaya, JP;
Masatsugu Arai, Kasumigaura, JP;
Akinori Tada, Hitachinaka, JP;
Kinya Aota, Hitachi, JP;
Kenji Nakai, Fukaya, JP;
Masatsugu Arai, Kasumigaura, JP;
Akinori Tada, Hitachinaka, JP;
Hitachi Vehicle Energy, Ltd., Ibaraki, JP;
Abstract
In a secondary battery, for providing a structure which can enable a welding operation even when a gap is formed between a current collecting plate and a winding assembly, recessed portions are formed in a positive current collecting plate. The recessed portions are disposed opposite to the winding assembly. A laser beam is irradiated to welding protrusions located between the recessed portions to melt the welding protrusions. Here, since the end surface of a positive electrode foil is uneven in height, the positive electrode foil does not contact the positive current collecting plate necessarily. The welding operation is performed by heating, melting, and dropping the welding protrusions by the use of a YAG laser under the welding condition of a laser power of 900 W and a welding speed 2 m/min.