METHOD FOR MANUFACTURING SECONDARY BATTERY

Provided is a method for manufacturing a secondary battery, comprising: a coating step for forming a positive electrode mixture layer and an insulating layer adjacent to the positive electrode mixture layer on a foil-shaped positive electrode substrate having a side edge extending in the longitudinal direction, the part between the side edge of the positive electrode base material and the insulating layer becomes an exposed part where the positive electrode base material is exposed; a pressing step for pressing the positive electrode mixture layer; and a stretching step in which, after the pressing step, the insulating layer and an extended portion between the side edge of the positive electrode substrate and the positive electrode mixture layer are stretched in the longitudinal direction, in which the yield stress of the positive electrode substrate or a stress that is at least 0.2% of the yield strength and less than the tensile strength of the positive electrode substrate is applied to the extended portion