Purging method of fuel cell system and fuel cell system

Abstract

The invention discloses a fuel cell system and a purging method of the fuel cell system.According to the purging method of the fuel cell system, the purging steps of a cell stack and a humidifier are controlled according to the relationship between the environment temperature and the freezing temperature of the humidifier. Specifically, when T is larger than T1, air passes through the humidifier and the cell stack, and the cell stack and the humidifier are purged at the same time until X is larger than X1; and when T is less than or equal to T1, firstly the cell stack and the humidifier are purged until X is greater than X2, and then the humidifier is independently purged until delta y is less than delta y1. According to the method of the invention, the content of moisture in the cell stack is quantified as the difference between the internal resistance of the cell stack and the calibrated internal resistance of the cell stack and the content of moisture in the humidifier is quantified as the difference between the air humidity of the first inlet of the humidifier and the air humidity of the second outlet of the humidifier and the difference between the the air humidity of the first inlet of the humidifier and the calibrated value of the difference between air humidity of the humidifier, and thus, the moisture content in the cell stack and the humidifier is ensured to reach the moisture content capable of preventing icing.

Description

technical field [0001] The invention relates to the field of new energy technologies, in particular to a fuel cell system purging method and the fuel cell system. Background technique [0002] The fuel cell system has the advantages of environmental protection, high energy density, high power generation efficiency, and fast start-up speed. [0003] In a low temperature environment, the liquid water in the humidifier of the fuel cell system will inevitably freeze, prolonging the cold start time of the fuel cell system, and even causing damage to the membrane electrodes of the stack of the fuel cell system in severe cases, reducing fuel consumption. The performance and service life of the battery system. [0004] In the prior art, the liquid water in the humidifier is generally reduced by purging. Specifically, when the fuel cell system is shut down, air is passed through the fuel cell system for a period of time to purge the moisture in the humidifier and the stack of the f...

AI Technical Summary

Problems solved by technology

[0005] However, the purge in the prior art cannot quantify the purge time, so as to ensure that the moisture content in the stack and humidifier will not freeze At the same time, the intercooler and humidifier are located at the entrance of the stack, and the humidity of the air entering the stack through the intercooler and humidifier will increase, and it takes a long time to purse to achieve the purpose, resulting in resources waste

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