POUCH, AND SECONDARY BATTERY COMPRISING SAME

Disclosed is a pouch including a first sealing portion wherein an upper sheet and a lower sheet are sealed, and a second sealing portion present in a partial or entire region of the first sealing portion. The pouch further includes a second sealing portion present in a partial or entire region of the first sealing portion, thus efficiently preventing permeation of external moisture and leakage of electrolyte solution through the first sealing portion and enabling fabrication of batteries with improved capacitance maintenance and resistance increase.