Method for manufacturing secondary battery and method for manufacturing electrode assembly

A method for manufacturing a secondary battery, the method comprising:

• a first process (S10) of manufacturing an incomplete electrode assembly in which a plurality of electrodes and a plurality of separators are alternately stacked;
• a second process (S20) 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;
• a third process (S30) of accommodating the complete electrode assembly into a case;
• a fourth process (S40) of injecting an electrolyte through an opening of the case to impregnate the electrolyte into the electrode assembly, wherein the electrolyte is permeated into nonbonding portion of the interface between the electrode and the separator and impregnated up to the inside of the electrode assembly;
• a fifth process (S50) of sealing an unsealed surface in which the opening of the case is formed to manufacture a secondary battery;
• and
• a sixth process (S60) 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.