Abstract: To provide a fuel cell system capable of improving sub-zero startability of the fuel cell system. A fuel cell system, wherein the fuel cell system comprises a fuel cell stack, a cooling water pump, a temperature sensor, and a control device; wherein the fuel cell stack comprises stacked unit cells; wherein the cooling water pump is configured to circulate cooling water for cooling the fuel cell stack; wherein the temperature sensor is configured to measure an outside air temperature when starting the fuel cell system; wherein the control device is configured to determine a degree of deterioration of the unit cells; and wherein, when starting the fuel cell system below freezing point, the control device is configured to determine a time for stopping the cooling water pump according to a degree of deterioration of the unit cells.

Abstract: In an inspection method for inspecting occurrence of a deformation in a fuel cell, a change amount between a pressure loss parameter value before an impact and a pressure loss parameter value after the impact is found, and when the change amount is a reference value determined in advance or more, it is determined that the deformation occurs inside the fuel cell. It is determined that the deformation occurs inside the fuel cell due to the impact, in at least either of a case where the change amount of a first pressure loss parameter value that is a pressure loss parameter value in a gas passage is a first reference value or more and a case where the change amount of a second pressure loss parameter value that is a pressure loss parameter value in a refrigerant passage is a second reference value or more.

Abstract: In an inspection method for inspecting occurrence of a deformation in a fuel cell, a change amount between a pressure loss parameter value before an impact and a pressure loss parameter value after the impact is found, and when the change amount is a reference value determined in advance or more, it is determined that the deformation occurs inside the fuel cell. It is determined that the deformation occurs inside the fuel cell due to the impact, in at least either of a case where the change amount of a first pressure loss parameter value that is a pressure loss parameter value in a gas passage is a first reference value or more and a case where the change amount of a second pressure loss parameter value that is a pressure loss parameter value in a refrigerant passage is a second reference value or more.