MID- OR LARGE-SIZED BATTERY PACK HAVING IMPROVED COOLING EFFICIENCY

摘要

The present invention relates to a mid- or large-sized battery pack having a structure in which two or more battery modules, including a plurality of chargeable/dischargeable battery cells or unit modules (unit cells), are embedded in the space between a pack case and a base plate. Cooling members including heat-dissipating fins contacting outer surfaces of the unit cells, and refrigerant pipes connected to the lower ends of the heat-dissipating fins, respectively, so as to enable refrigerant to flow therethrough, are arranged at the interfaces among the unit cells. The base plate located at the lower ends of the battery modules forms a refrigerant flow channel corresponding to the refrigerant flow direction of the refrigerant pipes. The pack case is coupled to the base plate when the battery modules are mounted on the base plate. The refrigerant for dissipating heat generated by the unit cells is introduced from one side of the refrigerant flow channel of the base plate, passes through the refrigerant pipes of the cooling members arranged among the unit cells, and is discharged through the other side of the refrigerant flow channel of the base plate.