| 摘要 |
A lithium ion secondary battery of the invention includes an electrode structure induding an electrode group composed of a strip-shaped laminate or winding induding a positive electrode in which a positive electrode active material layer is attached to a positive electrode current collector, a negative electrode, and a separator, a positive electrode current collector plate induding aluminum foil; and a negative electrode current collector plate electrically connected to the negative electrode. The positive electrode has, at one longitudinally extending end edge of the laminate, a positive electrode current collector-exposed portion protruding beyond the negative electrode. The positive electrode current collector plate is electrically connected to the positive electrode by applying a non-corrosive flux containing a fluoride to at least one of the positive electrode current collector-exposed portion and the positive electrode current collector plate, and then welding the positive electrode current collector plate to the positive electrode current collector-exposed portion. |
