SEALING DEVICE AND METHOD FOR SECONDARY BATTERY

A sealing device for a secondary battery, the sealing device configured to seal a sealing part of a pouch through which an electrode lead extends according to the present invention comprises: a lower sealing tool configured to receive the sealing part of the pouch seated thereon; and an upper sealing tool configured to press and seal the sealing part of the pouch, wherein the lower sealing tool comprises: a lower fixed block configured to receive the sealing part of the pouch seated on a top surface thereof; and one or more lower detachable blocks detachably coupled to the lower fixed block and configured to support a portion of the sealing part through which the electrode lead does not extend.