Low-power high-temperature proton exchange membrane fuel cell stack

Abstract

The invention discloses a low-power high-temperature proton exchange membrane fuel cell stack. According to the technical scheme of the invention, the low-power high-temperature proton exchange membrane fuel cell stack comprises an anode end plate and a cathode end plate, wherein a plurality of current collection plates, bipolar plates, MEAs and ceramic insulating plates are arranged between the anode end plate and the cathode end plate, a cathode gas inlet and an anode gas inlet are formed in one side of the bipolar plate, a cathode gas outlet and an anode gas outlet are formed in the other side of the bipolar plate, a cathode gas flow channel and an MEA active region are arranged in the middle of the bipolar plate, the width of the cathode gas inlet is greater than that of the anode gasinlet, the ratio of the lengths of two adjacent sides of the MEA active region is greater than 1, the cathode gas inlet and the anode gas inlet are formed in two sides of the short side in the MEA active region, the cathode flow channel is a fractal flow channel, and two surfaces, which do not comprise the cathode gas inlet or the anode gas inlet, of the stack are heating surfaces. The scheme provided by the invention is small in size, light in weight, rapid in heating and low in parasitic power consumption.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a low-power high-temperature proton exchange membrane fuel cell stack. Background technique [0002] Proton exchange membrane fuel cell directly converts chemical energy into electrical energy. It is characterized by quietness, high efficiency and cleanliness. It is considered to be the next generation power generation technology and an ideal substitute for gasoline and diesel generators. Today, the proton exchange membrane fuel cell has also made great progress, and it is one of the important development directions in the field of new energy. However, the operating temperature of traditional low-temperature proton exchange membrane fuel cells is less than 90°C, and dozens of ppm of CO can poison the Pt catalyst, resulting in the failure of the stack. Therefore, low-temperature proton exchange membrane fuel cells have very strict requirements on fuel, usually requiring its H2...

AI Technical Summary

Problems solved by technology

[0005] The conventional high-temperature proton membrane fuel cell stack power is greater than 300W, and the cathode air inlet and the anode air inlet are perpendicular to each other. It is necessary to add a fairing at the cathode inlet and outlet, resulting in an excessively large stack volume; and because the cathode air intake occupies the bipolar plate On both sides, there is only one side of the heating surface of the electric stack, which requires high-power heating equipment, and uneven heating causes differences in the expansion of the electric stack. After long-term use, there will be dislocation of the bipolar plates of the electric stack.

However, the traditional serpentine flow field of the high temperature reactor is not conducive to reducing wind resistance, resulting in a large intake pressure

Images