| 摘要 |
The purpose of the present invention is to provide: a flat wound secondary battery in which it is possible to reduce wrinkles created in electrodes due to projections and recesses in welded parts; and a method for producing said flat wound secondary battery. This secondary battery is a flat wound secondary battery comprising a wound electrode body in which a positive electrode (34) and a negative electrode (32) are flatly wound around an axial core (80) with separators (33, 35) interposed therebetween. The axial core (80) includes: an innermost circumference part (82) that forms the innermost circumference of the axial core (80) and that is made by winding a resin sheet (81) having a higher flexural rigidity than any of the positive electrode (34), the negative electrode (32), and the separators (33, 35); and an extended part (83) that is extended more on the side of the winding end part than the innermost circumference part (82). The separators (33, 35) each have: a joint part that is joined to the extended part (83); and a separator wound part that is contiguous with the joint part and made by winding only the separator (33, 35) at least once around the axial core (80). |
