BATTERY PACK PROVIDING IMPROVED DISTRIBUTION UNIFORMITY IN COOLANT

摘要

PURPOSE: A battery pack is provided to minimize differential pressure between unit cells, to restrain the performance degradation of a unit cell, and to increase cooling efficiency by forming a plurality of coolant inflow parts and coolant outflow parts. CONSTITUTION: A battery pack(400a) comprises unit cells. The unit cell composes at least one battery module by erectly arranging the unit cells spaced apart at a specific interval. The battery module composes one battery module group(110a,110b). The battery module group is arranged in a coolant inflow direction of a coolant inlet(210). The battery module group is arranged in a coolant inflow direction of a coolant inlet(210). The coolant inlet is formed in the bottom of the respective battery module. The coolant outlet consists of a first and second coolant drain parts(240,250). The coolant path between the coolant inlet and the coolant outlet has a structure cooling coolants by passing the respective unit cells and discharging upwards through a coolant outlet(230).