Fuel cell water content detection device and control method

Abstract

The invention discloses a fuel cell water content detection device and a control method. The fuel cell water content detection device comprises an edge light-transmitting flow field plate, a fuel cell, a parallel light source, an illuminance sensor, a control unit, an air tank, an electric control switch valve, a regulating valve and an automatic flow meter. The edge of a flow field plate of the fuel cell is transparent through glass and adhesive, and the glass corresponds to a runner of the fuel cell, wherein the parallel light source penetrates through the fuel cell edge light-transmitting flow field plate, and emitted light signals are received by the illuminance sensor. The control unit receives signals sent by the illuminance sensor and the automatic flow meter, the air tank is connected with the electric control switch valve, the regulating valve, the automatic flow meter and the fuel cell, and the control unit regulates the electric control switch valve and the regulating valveto purge the fuel cell according to voltage signals of the illuminance sensor, the automatic flow meter and the fuel cell. The method for detecting and controlling the water content of the fuel cell can accurately meet the purging requirement of the cell in the running process of an automobile according to the water content.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for detecting and controlling the water content of the fuel cell. Background technique [0002] With the reduction of fossil energy and the country's increasing emphasis on energy conservation and emission reduction, new energy has attracted more attention, and fuel cells are considered to be one of the most promising directions. Among them, the low-temperature hydrogen-oxygen fuel cell has the advantages of lower requirements on the working environment temperature, no additional carbon emissions, and no open flames due to the catalytic reaction of the catalyst, so it has a wide range of applications. However, there are still various problems surrounding fuel cells, among which membrane dryness and water flooding are particularly important. The catalytic reaction of fuel cells often occurs at the triple point. Membrane dryness and water flooding both reduce the reaction rate, ...

AI Technical Summary

Problems solved by technology

However, the general purging method tends to cause inaccurate control of the water content in the fuel cell, and it is impossible to observe the serious situation of water flooding in the front or middle and rear of the flow field plate flow channel of the fuel cell, and thus formulate different purge strategy

At the same time, partial membrane dryness and membrane fatigue damage caused by improper purging will also reduce the service life of the fuel cell.

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