Lithium-ion secondary battery

Details Lithium-ion secondary battery Lithium-ion secondary battery

2011-08-02

2011-08-02

Ryan, Patrick (Department: 1726)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S143000, C429S147000, C429S161000

Reexamination Certificate

active

07989107

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 disks7are disposed so as to face both end faces of the winding group, respectively. The current collecting disk7has projecting ridge portions8on a face thereof opposite to the winding group and flat face portions facing the winding group at positions corresponding to the projecting ridge portions8. The projecting ridge portions8are 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 disks7and joining is performed by irradiating the projecting ridge portions8with laser beam. The flat face portions of the current collecting disks7abut 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.

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