| 摘要 |
PROBLEM TO BE SOLVED: To suppress winding looseness of a laminated electrode body at a winding center of a wound electrode body. SOLUTION: The wound electrode body is manufactured by using a five-layer structured laminated electrode body that is composed by laminating in the order of a positive electrode; a separator; a negative electrode; a separator; and a positive electrode so that a cathode active material layer and the negative electrode are opposite to each other via the separator, while using the positive electrode in which the cathode active material layer is provided on one face of a positive-electrode current collector. Winding is executed by providing a winding start at a position apart from one end of the laminated electrode body at a distance of more than 5% of an electrode length of the laminated electrode body. Consequently, it is possible to bendingly arrange the laminated electrode body so as to pass through the center axis of a space of a winding innermost periphery without exposing the end of the laminated electrode body at the winding center where a fixing member is hardly provided. The end of the laminated electrode body is exposed at the winding outermost periphery, and is fixed with a fixing member. It is more preferable that the laminated electrode body arranged at the winding innermost periphery is composed so as to have a nearly S-shaped cross-section. COPYRIGHT: (C)2008,JPO&INPIT
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