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:
Apr. 03, 2012
Filed:
Feb. 02, 2009
Mitsuru Nagai, Tokyo, JP;
Takashi Utsunomiya, Tokyo, JP;
Kunio Nakazato, Tokyo, JP;
Nobuo Ando, Tokyo, JP;
Mitsuru Nagai, Tokyo, JP;
Takashi Utsunomiya, Tokyo, JP;
Kunio Nakazato, Tokyo, JP;
Nobuo Ando, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An electric storage devicehas a positive electrode, a negative electrodeand a separatorprovided between the positive electrodeand the negative electrode. The negative electrode surfaceis formed to be larger than the positive electrode surfacein such a manner that a positive electrode outer edgeand a negative electrode outer edgeare apart from each other by 2 mm or more. By this configuration, an ion restricting sectionis formed at the outer peripheral portion of the separator. Accordingly, the movement of the lithium ions toward the negative electrode end surfacecan be restricted, when the device is charged with a large current, whereby the deposition of metal lithium on the negative electrode end surfacecan be prevented.