Method for solving problem of water logging of oxyhydrogen fuel cell in closed environment

Abstract

The invention belongs to the field of fuel cells, and particularly discloses a method for solving the problem of water logging of an oxyhydrogen fuel cell in a closed environment. The method specifically comprises the following steps: calculating a monomer voltage deviation ratio and an average voltage deviation ratio in the fuel cell, judging whether the monomer voltage deviation ratio and the average voltage deviation ratio are both smaller than a pulse voltage drop ratio, if so, judging that the state is normal, and if not, entering the next step; using a buffer tank for replacing a gas supply gas cylinder to supply gas to the fuel cell stack, and if the single voltage or the average voltage is lower than the protection voltage, starting a protection mechanism; when any one of the hydrogen buffer pressure and the oxygen buffer pressure is smaller than the buffer pressure, reusing the gas supply cylinder for supplying gas to the fuel cell, and taking out water in the fuel cell stack through the pressure difference; and repeating the operation until the fuel cell is shut down. According to the invention, the flooding trend of the stack can be early warned, regulation and control time is reserved for fault avoidance, and water is taken out by using driving force generated by pressure difference, so that the flooding problem of the closed fuel cell is solved, and the fuel utilization rate is improved.

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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