Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...
Reexamination Certificate
2008-03-27
2011-11-08
Lee, Cynthia (Department: 1726)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Cell enclosure structure, e.g., housing, casing, container,...
C429S131000, C429S133000, C429S136000, C429S168000, C429S163000
Reexamination Certificate
active
08053105
ABSTRACT:
The present invention provides a lithium-ion secondary battery which can suppress internal resistance to a small value. The lithium-ion secondary battery includes 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 portion1projects at an upper portion of the winding group, while an end portion of a negative electrode mixture non-application portion projects at a lower portion of the winding group. Current collecting disks7are disposed on both end faces of the winding group so as to face them, respectively, and materials for the current collecting disks are the same materials as those for a positive electrode current collector and a negative electrode current collector. An end portion of the positive electrode mixture non-application portion1is joined to a face of the current collecting disk7positioned on the side of the winding group at a plurality of joint portions on the positive electrode side, while an end portion of the negative electrode mixture non-application portion is joined to a face of the current collecting disk7positioned on the side of the winding group at a plurality of joint portions on the negative electrode side. Some of the joint portions form joint portions taking on a width expansion shape gradually expanding from a joint end portion with the positive electrode mixture non-application portion1toward the current collecting disk7. A volume of the joint portion25is increased.
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Office Action issued by European Patent Office in corresponding European Patent Application No. 08 153 349.9.
Office Action issued by Chinese Patent Office in corresponding Chinese Patent Application No. 2008100886290.
Communication from European Patent Office, dated Jan. 18, 2011, in corresponding European Patent Application No. 08 153 349.9.
Aota Kinya
Nakai Kenji
Tada Akinori
Hitachi Vehicle Energy, Ltd.
Lee Cynthia
Roberts Mlotkowski Safran & Cole P.C.
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