NOVELTY - The heat sink (20) has a heat-radiating case attached to sides of a set of battery cells (10) and filled with first refrigerant. A refrigerant circulating pipe is arranged in the heat-radiating case, and circulates second refrigerant for cooling the first refrigerant. A set of supports is located between an inner side of the heat-radiating case and the refrigerant circulating pipe, where the supports are discontinuously arranged along the refrigerant circulating pipe to support the refrigerant circulating pipe. The second refrigerant is injected through an inlet.    USE - Heat sink for a plate shaped battery cell of a battery cell module (claimed) of an electric vehicle e.g. electric car and hybrid car.    ADVANTAGE - The heat-radiating case circulates the first and second refrigerants, so that the first refrigerant is circulated at speed lower than circulation speed of the second refrigerant, thus absorbing heat generated from the battery cells and radiating the absorbed heat in rapid manner, and hence restraining the battery cells from deterioration. The heat-radiating case sets the circulation speed of the second refrigerant to be higher than that of the first refrigerant to transfer the heat moved to the first refrigerant to the second refrigerant that passes through the inner side of the heat-radiating case containing the first refrigerant so as to radiate the heat to the outer side of the battery cells in rapid manner. The heat sink prevents heat generated from the battery cell from radiating rapidly to the battery cells from deterioration.    DETAILED DESCRIPTION - The first and second refrigerants include air, water, antifreeze, antifreeze-added water, Freon refrigerant, natural refrigerant and liquefied gas. An INDEPENDENT CLAIM is also included for a battery cell module comprising a heat exchanger.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a battery cell module of an electric vehicle.    Battery cells (10)    Heat sink (20)    Heat exchanger (30)    Injection pipe (32)    Battery cell module (100)