Fuel cell thermal management system, fuel cell and fuel cell automobile

The utility model relates to a fuel cell thermal management system, a fuel cell and a fuel cell automobile, the fuel cell thermal management system comprises an electric pile, a water pump, a deionizer and a first ion concentration sensor, the deionizer and the first ion concentration sensor are sequentially connected in series at the upstream of a cooling water inlet of the electric pile; the first ion concentration sensor is connected with a signal input end of a controller of the fuel cell thermal management system, and the water pump is connected with a signal output end of the controller of the fuel cell thermal management system; therefore, the fuel cell thermal management system can detect the ion concentration of the cooling water at the cooling water inlet of the electric pile in real time and adjust the rotating speed of the water pump according to the ion concentration in the cooling water so as to avoid the misjudgment that the ion concentration in the cooling liquid is increased due to the change