| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery having a flat wound electrode body and good charge and discharge cycle characteristics with good productivity.SOLUTION: The problem is solved by a nonaqueous electrolyte secondary battery which comprises: a wound electrode body shaped in a flat form in cross section and arranged by put together a positive electrode, a negative electrode appropriately and a separator and winding them like a swirl; a nonaqueous electrolyte; and a battery case in which the wound electrode body and the nonaqueous electrolyte are enclosed. The battery case has a bottomed cylindrical metal outer can and a lid for sealing an opening of the metal outer can; in a particular part of the outer can, the thickness t of metal making up the part is 0.30 mm or smaller. The positive electrode has a metal collector, and a positive electrode mixture layer formed on the collector on each side thereof and including a positive electrode active material, a conductive assistant and a binding agent. The collector of the positive electrode is 11 μm or smaller in thickness, and 2.5 N/mm or larger in tensile strength.SELECTED DRAWING: Figure 1 |
