US Patent 11509007 Refrigeration cycle device for cooling battery

A refrigeration cycle cools a battery. A controller controls a refrigerant flow rate flowing through a battery cooling system so as to adjust a temperature of the battery. The controller adjusts the refrigerant flow rate flowing in the battery cooling system so that the oil retained in the battery cooling system is flushed toward the compressor. The battery cooling system has a plurality of parallel systems. Electric expansion valves as flow adjusting valves are controlled so as to intermittently provide an oil-back operation. In the oil-back operation, the flow rate of the refrigerant flowing through a part among the plurality of parallel systems is increased more than a flow rate of the refrigerant flowed by a temperature control unit.