BATTERY PACK OF EXCELLENT COOLING EFFICIENCY

摘要

PURPOSE: A battery pack is provided to improve cooling uniformity of unit modules by reducing temperature derivation of the unit modules, thereby maintaining the performance of a battery pack. CONSTITUTION: A battery pack(200) comprises: a plurality of battery cells or unit modules(230) in which two or more battery cells are mounted, which is mounted in a battery pack case(270); a coolant inlet(210) and a coolant outlet(220) located at the upper part and the lower part of the pack case in order to flowing coolant along a direction vertical to unit cells-stacking direction(L) from one side of a battery module(232) to the opposite side; and a coolant inflow part(240) from the coolant inlet to the battery module, and a coolant outflow part(250) from the battery module to the coolant outlet, which are formed in the pack case respectively.