Membrane electrode assembly and proton exchange membrane fuel cell

Abstract

The invention provides a membrane electrode assembly and a proton exchange membrane fuel cell, and relates to the technical field of fuel cells, in the membrane electrode assembly, a membrane electrode cathode frame and a membrane electrode anode frame are respectively arranged at two sides of a catalyst coating membrane and in a cathode or anode area, and the frames surround a gas diffusion layer; the shape of the inner side edge of the frame is the same as that of the first winding flow channel at the upper edge of the polar plate, and one of the two ridges on the two sides of the first winding flow channel at the edge of the polar plate, which is close to the edge of the polar plate, is taken as the outer side ridge of the polar plate, and the other ridge is taken as the inner side ridge of the polar plate; and the inner side edge of the frame coincides with the inner side edge of the polar plate outer side ridge. The proton exchange membrane fuel cell comprises the membrane electrode assembly. According to the invention, the technical problems of non-uniform gas distribution and influence on the performance and the service life of the fuel cell due to the fact that the inner edge of the membrane electrode frame is linear and the widths of the inner side ridge and the outer side ridge are different in the bipolar plate fuel cell with a zigzag flow channel in the prior art are solved.

Description

technical field [0001] The present invention relates to the technical field of fuel cells, in particular to a membrane electrode assembly and a proton exchange membrane fuel cell. Background technique [0002] A fuel cell is an energy conversion device that directly converts the chemical energy of hydrogen and oxygen into electrical energy through an electrochemical reaction. It has the advantages of high energy conversion efficiency, zero emission, low operating noise and long service life, and can be widely used in transportation, aerospace, portable power supply and backup power supply and other fields. [0003] The proton exchange membrane fuel cell consists of an anode plate, a membrane electrode assembly, a frame, and a cathode plate. The fuel is oxidized at the anode, the oxidant is reduced at the cathode, and the electrons generated by the electrochemical reaction move directionally in the external circuit to generate electricity. The membrane electrode activation z...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a membrane electrode assembly and a proton exchange membrane fuel cell, so as to alleviate the problem that in the fuel cell using meandering channel bipolar plates in the prior art, the shape of the inner edge of the traditional membrane electrode frame contacting the pole plate is a straight line. type, and the width of the inner and outer ridges is different, resulting in uneven gas distribution, which affects the performance and life of the fuel cell.

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