A method for manufacturing a secondary battery, the method comprising: a first process of manufacturing an incomplete electrode assembly in which a plurality of electrodes and a plurality of separators are alternately stacked, wherein said plurality of electrodes are provided with a first electrode and a second electrode, and said plurality of separators are provided with a first separator and a second separator; a second process of partially pressing the incomplete electrode assembly to pattern-bond an interface between the electrode and the separator and thereby to manufacture a complete electrode assembly in which a bonding portion and a nonbonding portion coexist on the interface between the electrode and the separator, wherein the incomplete electrode assembly is partially heated and pressed through a pattern roller to manufacture the complete electrode assembly in which the interface between the electrode and the separator is pattern-bonded; a third process of accommodating the complete electrode assembly into a case; a fourth process of injecting an electrolyte through an opening of the case to impregnate the electrolyte into the electrode assembly, wherein the electrolyte is permeated into the nonbonding portion of the interface between the electrode and the separator and impregnated up to the inside of the electrode assembly; a fifth process of sealing an unsealed surface in which the opening of the case is formed to manufacture a secondary battery; and a sixth process of heating and pressing an entire surface of the secondary battery to bond the nonbonding portion of the interface between the electrode and the separator. a first process of manufacturing an incomplete electrode assembly in which a plurality of electrodes and a plurality of separators are alternately stacked, wherein said plurality of electrodes are provided with a first electrode and a second electrode, and said plurality of separators are provided with a first separator and a second separator; a second process of partially pressing the incomplete electrode assembly to pattern-bond an interface between the electrode and the separator and thereby to manufacture a complete electrode assembly in which a bonding portion and a nonbonding portion coexist on the interface between the electrode and the separator, wherein the incomplete electrode assembly is partially heated and pressed through a pattern roller to manufacture the complete electrode assembly in which the interface between the electrode and the separator is pattern-bonded; a third process of accommodating the complete electrode assembly into a case; a fourth process of injecting an electrolyte through an opening of the case to impregnate the electrolyte into the electrode assembly, wherein the electrolyte is permeated into the nonbonding portion of the interface between the electrode and the separator and impregnated up to the inside of the electrode assembly; a fifth process of sealing an unsealed surface in which the opening of the case is formed to manufacture a secondary battery; and a sixth process of heating and pressing an entire surface of the secondary battery to bond the nonbonding portion of the interface between the electrode and the separator.