Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer or spacer insulating structure
Reexamination Certificate
2004-12-28
2010-06-29
Ryan, Patrick (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer or spacer insulating structure
C429S131000, C429S129000, C429S136000, C429S137000
Reexamination Certificate
active
07745042
ABSTRACT:
A lithium ion secondary battery in which an abnormal overheat due to a short circuit of a current collecting portion of one electrode and an electrode material mixture of the other is prevented. The lithium ion secondary battery has: a positive electrode including a core material having a current collecting portion and a material mixture carrying portion and a material mixture layer carried thereon; a negative electrode including a core material having a current collecting portion and a material mixture carrying portion and a material mixture layer carried thereon; a separator and a porous electron-insulating layer including an inorganic oxide filler and a binder both interposed between the positive and negative electrodes; and a non-aqueous electrolyte. The insulating layer is carried on a region including surfaces of the positive electrode current collecting portion and material mixture layer, and/or a region including surfaces of the negative electrode current collecting portion and material mixture layer. The positive and negative electrodes are wound with the separator and the insulating layer interposed therebetween.
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Korean Office Action for Corresponding Application KR 10-2006-7004149 Dated Jan. 17, 2007.
Chinese Office Action, with English Translation, issued in Chinese Patent Application No. CN 2004800288687, mailed on Feb. 29, 2008.
Fujino Akiko
Hayashi Tetsuya
Ohata Tsumoru
Lee Cynthia
McDermott Will & Emery LLP
Panasonic Corporation
Ryan Patrick
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