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:
Aug. 02, 2011
Filed:
Mar. 27, 2008
Kenji Nakai, Hitachinaka, JP;
Akinori Tada, Hitachinaka, JP;
Seiichi Sato, Hitachinaka, JP;
Masatsugu Arai, Hitachinaka, JP;
Kenji Nakai, Hitachinaka, JP;
Akinori Tada, Hitachinaka, JP;
Seiichi Sato, Hitachinaka, JP;
Masatsugu Arai, Hitachinaka, JP;
Hitachi Vehicle Energy, Ltd., Ibaraki, JP;
Abstract
A lithium-ion secondary battery where a current collecting member and a foil are joined to each other securely while damage of the foil is suppressed is provided. The lithium-ion secondary battery is provided with a winding group obtained by winding a positive electrode plate and a negative electrode plate via a separator. An end portion of a positive electrode mixture non-application portion and an end portion of a negative electrode mixture non-application portion project at an upper portion and a lower portion of the winding group, respectively. Current collecting disksare disposed so as to face both end faces of the winding group, respectively. The current collecting diskhas projecting ridge portionson a face thereof opposite to the winding group and flat face portions facing the winding group at positions corresponding to the projecting ridge portions. The projecting ridge portionsare formed radially. The end portion of the positive electrode mixture non-application portion and the end portion of the negative electrode mixture non-application portion are caused to abut on the flat face portions of the current collecting disksand joining is performed by irradiating the projecting ridge portionswith laser beam. The flat face portions of the current collecting disksabut on the end portion of the positive electrode mixture non-application portion and the end portion of the negative electrode mixture non-application portion approximately evenly.