NONAQUEOUS SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery capable of preventing mutual contact of positive and negative collectors and contact of positive electrode collector with a coated membrane of a negative electrode, even if not only a separator but also an insulator are damaged, to prevent excessive short circuit current from flowing and prevent generation of dendrite. SOLUTION: An electrode winding body 7 has a positive electrode 9, in which a coated membrane 17 containing positive electrode active material, is arranged on both front and rear faces of the positive electrode collector 19; the negative electrode 10 in which a coated membrane 20, containing negative electrode active material, is arranged on both front and rear faces of negative electrode collector 21; and the separator 11. The positive electrode 9 and the negative electrode 10 are wound via the separator 11. A tip, on an outermost periphery side in the direction of winding of the negative electrode 10, retreats to the inner peripheral side in the direction of winding more than tips of coated membranes 17, 17 of the positive electrode 9 facing it so that the negative electrode 10 does not face the positive electrode collector 19 in exposed condition. Lithium ion non-penetrating polyimide paint 22 is applied to a tip part at the outermost periphery of the negative electrode 10 as the insulator. COPYRIGHT: (C)2006,JPO&NCIPI