Ventilation device for pouch-type secondary battery and battery module including the same

A battery module, comprising:

• a plurality of battery cells stacked on each other, each of the plurality of battery cells comprising an electrode lead;
• and
• a bus bar assembly coupled to the electrode leads of the plurality of battery cells to connect the plurality of battery cells to each other, wherein the bus bar assembly comprises:
• a main frame comprising a slit portion into which the electrode leads of the plurality of battery cells are inserted;
• a bus bar mounted on an outer surface of the main frame to electrically connect the electrode leads to each other;
• and
• a plurality of inner frames spaced apart from each other on an inner surface of the main frame to guide the electrode lead to the slit portion,
• wherein the plurality of inner frames comprises a first inner frame and a second inner frame neighboring each other with a space therebetween as a ventilation control portion, and the first inner frame comprises a ventilation guiding portion that is recessed from a surface facing the second inner frame and is connected to the ventilation control portion,
• wherein the plurality of battery cells each includes an electrode assembly and a pouch for accommodating the electrode assembly,
• wherein the pouch includes a sealing portion formed outside the electrode assembly and a pouch terrace portion adjacent to the sealing portion,
• wherein the plurality of inner frames includes a terrace restraining portion including an inclined surface structured to support the pouch terrace portion of the plurality of battery cells and formed at a surface of the first inner frame adjacent to a surface including the ventilation guiding portion,
• wherein the pouch terrace portion is formed to be inclined and supported by the terrace restraining portion to suppress expansion.