The invention proposes a thermal management device,
system and method of a fuel
cell stack. The device comprises a pipeline mechanism, a cooling liquid inlet, a control mechanism and a
needle valve mechanism, wherein the pipeline mechanism penetrates through the fuel
cell stack and is connected with a water box, a
heat sink and a water pump, the cooling liquid inlet is used for circularly coolinga cooling liquid discharged out of a cooling liquid outlet of the fuel
cell stack and then transmitting the cooling liquid to the fuel cell stack, the control mechanism is connected with a
data acquisition device and is used for determining a temperature of the cooling liquid according to a temperature
signal acquired by a
data acquisition device and controlling opening degree of a
needle valve according to the temperature
signal so that the temperature of the cooling liquid is within a preset temperature range, the
needle valve mechanism is arranged on a path between the water pump and the
heat sink and is used for controlling flowing quantity of the cooling liquid of the
heat sink according to a
signal of the control mechanism, the pipeline mechanism comprises exhaust air ducts, the exhaust air ducts are respectively arranged on a path between the cooling liquid inlet of the fuel cell stack and the water box and on a path between a deionized water tank and the water box and are usedfor transmitting bubbles in the cooling liquid in the pipeline mechanism to the water box.