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:
Oct. 05, 2010
Filed:
Jul. 16, 2008
Masaharu Miyahisa, Osaka, JP;
Yoshiki Ohsawa, Osaka, JP;
Hideyuki Kumakiri, Osaka, JP;
Seiichi Kato, Osaka, JP;
Masaharu Miyahisa, Osaka, JP;
Yoshiki Ohsawa, Osaka, JP;
Hideyuki Kumakiri, Osaka, JP;
Seiichi Kato, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A secondary battery includes an electrode plate group () in which a positive electrode plate () and a negative electrode plate () are wound or stacked with a separator () interposed therebetween and a battery case () in which the electrode plate group () and an electrolyte are contained. At least one of the positive electrode plate () and the negative electrode plate () includes a porous protective film () formed on a surface of an active material layer. In a surface of the at least one of the electrode plates on which the porous protective film () is provided, a plurality of grooves () are formed, and the grooves () are also formed in the surface of the active material so that each of the grooves () extends from the surface of the porous protective film () to the surface of the active material layer.