Cooling device

A cooling device capable of receiving, cooling, and discharging a fluid-to-be-cooled, comprising:

• a plurality of heat exchangers arranged at different positions from each other in the up and down direction, each of the heat exchangers having a refrigerant container that stores a liquid refrigerant for cooling the fluid-to-be-cooled, and a plurality of heat exchanger core portions immersed in the liquid refrigerant in the refrigerant container, the heat exchanger core portions that respectively permit the fluid-to-be-cooled to flow for performing heat exchange with the liquid refrigerant;
• and
• a plurality of heat exchanger connection portions respectively forming a plurality of cooling flow passages for the fluid-to-be-cooled to pass through the plurality of heat exchangers in order by connecting the heat exchanger core portions to each other between the heat exchangers adjacent to each other among the plurality of heat exchangers,
• wherein each of the plurality of heat exchanger connection portions includes a receiving port connected to the uppermost heat exchanger serving as the heat exchanger positioned on the uppermost among the plurality of heat exchangers, the receiving port that receives the fluid-to-be-cooled into the cooling flow passage, and a discharging port connected to the lowermost heat exchanger serving as the heat exchanger positioned on the lowermost among the plurality of heat exchangers, the discharging port that discharges the cooled fluid-to-be-cooled from the cooling flow passage, and
• the plurality of cooling flow passages are disposed independently from each other at least from the uppermost heat exchanger to the lowermost heat exchanger.