Fault detection method of fuel cell

The current density distribution and the temperature distribution of the galvanic pile during normal operation under the rated working condition are respectively used as the standard current density distribution and the standard temperature distribution, and the discrete coefficient of the standard current density distribution and the standard temperature distribution is used as the standard discrete coefficient; if the difference between the discrete coefficient of the current density component and the temperature distribution of the galvanic pile and the standard discrete coefficient exceeds a first threshold value, prompting that the galvanic pile has a fault; and the fault reason of the electric pile can be analyzed according to the change conditions of the current density distribution and the temperature distribution of the electric pile and the standard current density distribution and the standard temperature distribution when the fault occurs. By adopting the method to analyze the fault of the battery