Pouch Type Secondary Battery and Battery Pack Including the Same

A battery pack comprising:

• a plurality of secondary batteries;
• and a packaging accommodating the secondary batteries,
• wherein each of the secondary batteries include:
• an electrode assembly;
• a case including an accommodation portion accommodating the electrode assembly, and a terrace portion formed along a periphery of the accommodation portion, has and having a sealing portion in which a portion of a width thereof is sealed;
• an electrode lead which is electrically connected to the electrode assembly and protruding from the case;
• a lead film disposed between the electrode lead and the case;
• a gas guiding portion disposed between the electrode lead and the lead film and including a permeation portion provided on an outside of the case and one or more gas channels extending from the permeation portion toward the electrode assembly via the sealing portion;
• and
• a reinforcing film disposed on the lead film so as to cover at least a portion of the permeation portion.