Method of manufacturing lithium secondary battery with gel polymer electrolyte

1. A method for manufacturing a lithium secondary battery, the method comprising:

injecting a composition for a gel polymer electrolyte into a lithium secondary battery case including an electrode assembly including a metal electrode current collector, and then sealing the lithium secondary battery case;

placing the lithium secondary battery case inside a fixing member including an electromagnetic field generation means to generate an electromagnetic field; and

heating the metal electrode current collector with induction heating using the electromagnetic field generated by the electromagnetic field generation means, to heat-cure the composition for a gel polymer electrolyte.

2. The method of claim 1 , wherein the electromagnetic field generation means includes an inductor including a winding coil.

3. The method of claim 1 , wherein the fixing member comprises:

an upper plate; and

a lower plate.

4. The method of claim 3 , wherein at least one of the upper plate and the lower plate of the fixing member is movable in an up and down direction.

5. The method of claim 3 , wherein the electromagnetic field generation means is embedded inside at least one of the upper plate and the lower plate.

6. The method of claim 1 , wherein the electromagnetic field generation means generates an induction current, such that the metal electrode current collector is heated under a temperature condition of 30° C. to 150° C.

7. The method of claim 1 , wherein the electromagnetic field generation means generates an induction current, such that the metal electrode current collector is heated under a temperature condition of 35° C. to 130° C.

8. The method of claim 1 , wherein the electromagnetic field generation means generates an induction current, such that the metal electrode current collector is heated under a temperature condition of 40° C. to 120° C.

9. The method of claim 3 , A method for manufacturing a lithium secondary battery, the method comprising:

injecting a composition for a gel polymer electrolyte into a lithium secondary battery case including an electrode assembly including a metal electrode current collector, and then sealing the lithium secondary battery case;

placing the lithium secondary battery case inside a fixing member, the fixing member including an upper plate, a lower plate, and an electromagnetic field generation means; and

heating the metal electrode current collector using the electromagnetic field generation means, to heat-cure the composition for a gel polymer electrolyte, wherein at least one of the upper plate and the lower plate moves in an up and down direction to apply pressure of 0.1 kgf/cm 2 to 1,000 kgf/cm 2 to the lithium secondary battery case.

10. The method of claim 9 , wherein the at least one of the upper plate and the lower plate moves in an up and down direction to apply pressure of 0.1 kgf/cm 2 to 500 kgf/cm 2 to the lithium secondary battery case.

11. The method of claim 1 , wherein the electromagnetic field is an alternating magnetic field.

12. The method of claim 2 , wherein the heating of the metal electrode current collector includes providing an alternating current through the winding coil to form an alternating magnetic field as the electromagnetic field.

13. The method of claim 1 , wherein the heating of the metal electrode current collector includes heating the metal electrode current collector with induction heating using the electromagnetic field generated by the electromagnetic field generation means without heating the electromagnetic field generation means.