ESS MODULE HAVING STRUCTURE ENABLING PREVENTION OF EXTERNAL EXPOSURE OF FLAME, AND BATTERY PACK COMPRISING SAME

Disclosed is an ESS module, which includes a cell stack assembly including a cell stack formed by stacking a plurality of battery cells and a plurality of mica barrier assemblies and a pair of bus bar frames coupled to both side portions of the cell stack; and a housing configured to accommodate the cell stack assembly and having a plurality of flow path holes formed at locations corresponding to a front side, a rear side and both side portions of the cell stack assembly, wherein the mica barrier assembly is provided between adjacent battery cells and at an outermost side of the cell stack to form a flow path along a stacking direction of the cell stack at a temperature lower than a reference temperature and to block the flow path at a temperature equal to or higher than the reference temperature.