摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a lithium secondary battery with an excellent productivity. <P>SOLUTION: The lithium secondary battery is manufactured by forming a wound inside electrode body or the like by winding a positive electrode plate 1A and a negative electrode plate through a separator, and connecting end parts of the positive electrode plate 1A and the negative electrode plate to a positive electrode current collecting member 4A made of aluminum or the like and a negative electrode current collecting member made of copper, respectively. The surface of respective connection parts 5 of the positive electrode current collecting member 4A and/or the negative electrode current collecting member are processed so as to have a center line average surface coarseness of 0.05 to 6.3 μmRa. The connection parts 5 of the positive electrode current collecting member 4A is fused and welded to the end part 15 of the positive electrode plate 1A by a laser beam having a power density of 5 kW/mm<SP>2</SP>or higher, and/or the connection parts of the negative electrode current collecting member is fused and welded to the end part of the negative electrode plate by a laser beam having a power density of 3 kW/mm<SP>2</SP>or higher. <P>COPYRIGHT: (C)2004,JPO&NCIPI |