Online measurement method for hydrogen flow of anode of fuel cell

The invention provides a fuel cell anode hydrogen flow online measurement method, belongs to the technical field of fuel cells, and solves the problem that it is difficult to obtain an accurate anode hydrogen flow evaluation result online in the prior art. The method comprises the following steps: S1, determining components of anode stack-out gas in a stack and the proportion of each component; s2, obtaining the total flow Q of in-pile gas and the temperature T of the in-pile gas, setting the initial value of the flow Q2 of backflow gas, and obtaining the theoretical pressure difference dP'between the front end and the rear end of a diffusion chamber of the ejector by combining the proportion of each component; and S3, comparing the actually measured pressure difference dP between the front end and the rear end of the diffusion chamber with the theoretical pressure difference dP'between the front end and the rear end of the diffusion chamber of the ejector, judging whether dP '-dP meets a set precision range