Sealing apparatus for secondary battery

1. A sealing apparatus in combination with a secondary battery, which seals a sealing part of a case in which an electrode assembly and an electrolyte are accommodated, the sealing apparatus comprising:

a sealing member comprising a first sealing piece and a second sealing piece, which thermally fuse a surface of the sealing part to seal the sealing part,

wherein the first sealing piece and the second sealing piece comprise a plurality of thermal fusion parts, which are disposed from an outer end of a surface of the sealing part toward an inner end that is opposite to the outer end to thermally fuse the surface of the sealing part, and non-thermal fusion parts, which are disposed between the plurality of thermal fusion parts and do not seal the surface of the sealing part,

wherein the thermal fusion part disposed on the inner end of the sealing part has an upward inclined surface that is inclined toward the inner end of the sealing part, and the upward inclined surface gradually decreases pressing force toward the inner end of the sealing part to deform a width of the inner end of the sealing part so that the width gradually increases to prevent a sealing layer disposed on the inner end of the sealing part from leaking to outside,

wherein the thermal fusion part disposed on the outer end of the sealing part has a downward inclined surface that is inclined toward the outer end of the sealing part, and the downward inclined surface gradually increases pressing force toward the outer end of the sealing part to deform a shape of the outer end of the sealing part into a sharp shape, and

wherein the sealing part has a flat, non-projected surface adjacent to the non-thermal fusion parts.

2. The sealing apparatus of claim 1 , wherein each of the non-thermal fusion parts is provided as an opening groove that is opened in a direction of the surface of the sealing part.

3. The sealing apparatus of claim 1 , wherein the non-thermal fusion part of the first sealing piece and the non-thermal fusion part of the second sealing piece are disposed to correspond to each other.

4. The sealing apparatus of claim 1 , further comprising a welding member that welds the outer end of the sealing part to seal the sealing part.

5. The sealing apparatus of claim 4 , wherein the welding member uses ultrasonic welding or laser welding.