Cathode flow channel of proton exchange membrane fuel cell for improving water removal effect

Abstract

The invention discloses a cathode flow channel of a proton exchange membrane fuel cell for improving a water removal effect, which is characterized in that a gas diffusion layer is a substrate layer close to one side of a bipolar plate, micro-bulge textures are processed on the surface of the gas diffusion layer of the cathode flow channel, and the water logging phenomenon of a liquid reaction product is eliminated by utilizing the micro-bulge textures. The micro-convex textures are sine wave micro-textures which are parallel to one another, and the cross section area of the sine wave micro-textures in the flow direction is kept unchanged. A hydrophilic pipe structure can be processed at the top of the cathode flow channel, the hydrophilic pipe is used for removing liquid reactants on the surface of the gas diffusion layer, the cross section of the hydrophilic pipe in the flow direction is circular, and the area of the cross section is kept unchanged. The two structures can strengthen the function that liquid water leaves the surface of the gas diffusion layer, the water flooding phenomenon of the cathode of the proton exchange membrane fuel cell is remarkably improved, a proper amount of water is allowed to wet airflow, and the wettability of a membrane electrode is kept. In addition, certain advantages are achieved in the aspects of controlling the rising rate of pressure drop in the flow channel and reducing power loss.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a cathode channel structure of a proton exchange membrane fuel cell capable of realizing water removal. Background technique [0002] With the increasingly serious energy and environmental problems, clean energy technology has attracted the attention and attention of countries all over the world. Proton exchange membrane fuel cell (PEMFC) is a power generation device that directly converts chemical energy into electrical energy. It has the advantages of zero emission, no pollution, high efficiency, and low noise. It has broad application prospects and huge market potential in the transportation field . At present, there is still a lot of room for improvement in the performance and life of proton exchange membrane fuel cells. Among them, water management is one of the key issues affecting the performance, cost, durability and reliability of PEMFC. [0003] The gas diffusion l...

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Problems solved by technology

[0004] In order to solve the deficiencies in the prior art, the present invention proposes a cathode channel of a proton exchange membrane fuel cell that improves the water removal effect. The surface of the gas diffusion layer of the channel is processed with a micro-protrusion texture of sinusoidal ripples, and a hydrophilic tube structure is processed in the cathode flow channel. These two structures are used to promote the liquid water in the cathode flow channel close to the surface of the gas diffusion layer to quickly separate from the gas diffusion. layer, to eliminate the blockage of the reaction gas path, in addition, to control the pressure drop increase rate in the flow channel, and to reduce power loss

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