A method for solving the flooding problem of hydrogen-oxygen fuel cells in a closed environment

Abstract

The invention belongs to the field of fuel cells, and specifically discloses a method for solving the flooding problem of hydrogen-oxygen fuel cells in a closed environment. The method is specifically as follows: calculating the deviation ratio of the monomer voltage and the deviation ratio of the average voltage in the fuel cell, and judging whether all of them are smaller than the ratio of the pulse voltage drop drop, if yes, then determine that the state is normal, if not, then enter the next step; use a buffer tank to replace The gas supply cylinder supplies gas to the fuel cell stack. If the cell voltage or average voltage is lower than the protection voltage, the protection mechanism is activated; when either the hydrogen buffer pressure or the oxygen buffer pressure is less than the buffer pressure, the gas supply cylinder is reused as The fuel cell supplies air, and the water in the fuel cell stack is taken out through the pressure difference; the above operation is repeated until the fuel cell stops. The invention can warn the water flooding trend of the electric stack, reserve control time for fault avoidance, and use the driving force generated by the pressure difference to bring out the water, so as to solve the water flooding problem of the closed fuel cell and improve the fuel utilization rate.

Description

technical field [0001] The invention belongs to the field of fuel cells, and more specifically relates to a method for solving the problem of flooding of hydrogen-oxygen fuel cells in a closed environment. Background technique [0002] Proton exchange membrane fuel cells (PEMFC) are widely used in fuel cell vehicles, buses, submarines and unmanned underwater navigation due to their high efficiency, high specific power and specific energy, zero emissions, operation at room temperature and short start-up time etc. as a power device. In an underwater environment, long-term closed operation of the fuel cell is required. However, during the long-term closed process of the stack, liquid water is continuously generated and accumulated in the battery, causing the battery to be flooded, which directly leads to the attenuation of battery performance and life. Therefore, good management of water transportation is essential to maintain the high efficiency of PEMFC. Stable operation is...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings and / or improvement needs of the prior art, the present invention provides a method to solve the problem of hydrogen-oxygen fuel cell flooding in a closed environment, in which the voltage drop is used as the standard for pre-judgment of flooding faults in the early stage, which can accurately warn The flooding trend of the stack; at the same time, the driving force generated by the pulse measure is taken to bring the water out, so as to solve the problem of flooding of the closed fuel cell and improve the fuel utilization rate

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