A plasma generating apparatus comprising: a roller part comprising a transfer roller for transferring a separator and a metal member built in the transfer roller; and a plasma generating part interacting with the metal member to generate plasma, characterized in that the plasma generating part comprises: a main body disposed in a width direction of the separator; and a plurality of electrode pieces disposed to be spaced apart from each other in a longitudinal direction of the main body to generate the plasma between the metal member and the main body and thereby forming a pattern on the surface of the separator, said pattern having an increased bonding force towards electrodes of a battery including the separator, compared to non-patterned area of the separator; the plasma generating part is provided with a plurality of electrode members connected to each other in the width direction of the separator, and each of the electrode members comprises a main body disposed in the width direction of the separator and two or more electrode pieces disposed to be spaced apart from each other in directions of both ends of the main body to partially generate the plasma between the metal member and the main body, the plurality of electrode members are detachably connected to each other, and each of the plurality of electrode members comprises a coupling groove (252a-1) and a coupling protrusion (252a-2) on surfaces corresponding to each other, and the coupling groove and the coupling protrusion are coupled to each other so that the plurality of electrode members are detachably connected to each other. a roller part comprising a transfer roller for transferring a separator and a metal member built in the transfer roller; and a plasma generating part interacting with the metal member to generate plasma, characterized in that the plasma generating part comprises: a main body disposed in a width direction of the separator; and a plurality of electrode pieces disposed to be spaced apart from each other in a longitudinal direction of the main body to generate the plasma between the metal member and the main body and thereby forming a pattern on the surface of the separator, said pattern having an increased bonding force towards electrodes of a battery including the separator, compared to non-patterned area of the separator; the plasma generating part is provided with a plurality of electrode members connected to each other in the width direction of the separator, and each of the electrode members comprises a main body disposed in the width direction of the separator and two or more electrode pieces disposed to be spaced apart from each other in directions of both ends of the main body to partially generate the plasma between the metal member and the main body, the plurality of electrode members are detachably connected to each other, and each of the plurality of electrode members comprises a coupling groove (252a-1) and a coupling protrusion (252a-2) on surfaces corresponding to each other, and the coupling groove and the coupling protrusion are coupled to each other so that the plurality of electrode members are detachably connected to each other. a main body disposed in a width direction of the separator; and a plurality of electrode pieces disposed to be spaced apart from each other in a longitudinal direction of the main body to generate the plasma between the metal member and the main body and thereby forming a pattern on the surface of the separator, said pattern having an increased bonding force towards electrodes of a battery including the separator, compared to non-patterned area of the separator; the plasma generating part is provided with a plurality of electrode members connected to each other in the width direction of the separator, and each of the electrode members comprises a main body disposed in the width direction of the separator and two or more electrode pieces disposed to be spaced apart from each other in directions of both ends of the main body to partially generate the plasma between the metal member and the main body, the plurality of electrode members are detachably connected to each other, and each of the plurality of electrode members comprises a coupling groove (252a-1) and a coupling protrusion (252a-2) on surfaces corresponding to each other, and the coupling groove and the coupling protrusion are coupled to each other so that the plurality of electrode members are detachably connected to each other.