| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery which prevents the damage of current collector leads involved in rewinding of an electrode group. SOLUTION: The lithium ion secondary battery has a winding group 6 into which a cathode plate and an anode plate are wound on an axial core 11, and flanges 7 arranged on both sides of the winding group 6 and having a smaller diameter D<SB>2</SB>than the diameter D<SB>1</SB>of the winding group 6. To the circumferential surface of the flange 7, the current collector leads 9 led out from the cathode and anode plates are connected. When the gap is made h between the end surface of the winding group 6 and the end surface of the winding group 6 side of the flange part 7, the length from a lead-out position of the current collector lead 9 at the outermost circumference to the connection position is set at≥(D<SB>1</SB>-D<SB>2</SB>)/2+h. The diameter D<SB>2</SB>of the flange 7, considering a deviation amount c is set at D<SB>2</SB>≤D<SB>1</SB>-c<SP>2</SP>/h between the lead-out position of the current collector lead 9 at the outermost circumference involved in rewinding of the winding group 6 in the horizontal direction when the axial core 11 is made vertical and the connection position, thereby securing the length of the current collector leads 9. COPYRIGHT: (C)2007,JPO&INPIT
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