| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery which never causes the decrease in capacity, and which is superior in safety even when an external pressure is applied thereto.SOLUTION: A nonaqueous secondary battery comprises an electrode body arranged by winding belt-shaped positive and negative electrodes opposed to each other through separators. The positive electrode has a positive electrode current collector, and a positive electrode mixture layer on one or each of opposing faces of the positive electrode current collector. The negative electrode has a negative electrode current collector, and a negative electrode mixture layer on one or each of opposing faces of the negative electrode current collector. The positive electrode mixture layer is provided, extending to both end portions in a winding axial direction. The negative electrode mixture layer is provided, extending to both end portions in the winding axial direction. The electrode body has end faces at least partially covered with an insulative fire-retardant resin at both ends of the winding axial direction. The separators are independent of each other as to end portions in the winding axial direction of the electrode body. The insulative fire-retardant resin is 30% or less in weight decrease rate at 300°C after vacuum drying.SELECTED DRAWING: Figure 1 |
