Rack-type power supply device

A rack-type power supply device comprising:

• a plurality of battery modules each of which accommodates a plurality of secondary battery cells;
• a rack main body that vertically accommodates the battery modules in a horizontal posture like a plurality of steps with gaps between the battery modules;
• and
• cooling fans that are disposed on a front surface side of the rack main body and blows cooling air into each of the gaps formed between the battery modules,
• wherein
• the rack main body includes a back-side duct where cooling air having passed through the gaps flows upward on a back surface side of the battery modules and an air outlet for discharging cooling air having passed through the back-side duct on a top surface side,
• the back-side duct is partitioned into a first flow path that allows cooling air having passed through the gaps formed between the battery modules accommodated in an upper region of the rack main body to pass and a second flow path that allows cooling air having passed through the gaps formed between the battery modules accommodated in a lower region of the rack main body to pass, and
• a number of the cooling fans is less than a number of the battery modules, and
• a center axis of each of the cooling fans in a blowing direction crosses a front surface of a corresponding one of the battery modules, and is disposed in a region that is within 10% to 90% of a total vertical thickness of said corresponding one of the battery modules assuming that the total vertical thickness of said corresponding one of the battery modules is 100%.