JP2009289714A5 - - Google Patents

Claims (5)

Lithium ion secondary comprising positive and negative electrode plates each having an electrode group wound through a separator, and positive and negative electrode current collecting tabs respectively led out from one side of the positive and negative electrode plates and arranged on opposite sides of the electrode group in batteries, one of which at least the positive electrode current collector tabs and negative electrode current collector tabs, on the outer peripheral surface intersecting the surface facing the oppositely disposed the electrode group of the current collecting part on the end face of the electrode group, substantially perpendicular direction A lithium ion secondary battery comprising a joint portion by laser light irradiated on the lithium ion secondary battery. Said at least one of the positive electrode current collector tabs and negative electrode current collector tab, the current collecting part is sandwiched between the outer peripheral surface and the metal caul plates, having a joint portion formed by laser light to the metallic backing plate The lithium ion secondary battery according to claim 1, characterized in that: The caul plate is a lithium ion secondary battery according to claim 2, characterized in that the corresponding Te overlap of both ends of the plate are oppositely disposed on the outer peripheral surface of the current collector part so that the unformed.   3. The current collecting component to which the negative electrode current collecting tab is bonded and the contact plate are made of copper, nickel, an alloy of copper and nickel, or a multilayer body of copper and nickel, respectively. Or the lithium ion secondary battery of Claim 3. A method of manufacturing a lithium ion secondary battery according to claim 1, arranged to face the outer peripheral surface of the current collector part as overlapping the ends of the metal caul Te corresponding plate is not formed And the both ends of the said backing plate are welded by the spot, respectively, Then, it joins over the perimeter of the said backing plate.