Welding Apparatus, Welding Method Using the Same, and Electrode Assembly Manufactured by the Welding Method

The present invention relates to a welding apparatus including an electrode assembly configured such that a plurality of positive electrodes and a plurality of negative electrodes are stacked in the state in which separators are interposed therebetween, guides configured to reduce tensile force of positive electrode tabs and negative electrode tabs protruding from the electrode assembly, an anvil configured to allow the electrode tabs to be disposed thereon, and a horn configured to apply ultrasonic waves to the electrode tabs disposed on the anvil, a welding method using the same, and an electrode assembly manufactured by the welding method.