Novel proton exchange membrane fuel cell

Abstract

The invention discloses a novel proton exchange membrane fuel cell. According to the proton exchange membrane fuel cell, a passage through which water, electricity and gas enter or exit from the cellis realized by designing a flow channel or a special convection zone in a diffusion layer, the phenomenon of 'bipolar plate removal' or 'bipolar plate flow channel removal' can be realized, the contact transmission resistance between the bipolar plates and the diffusion layer in the cell can be obviously reduced, and thus the PEMFC with high efficiency, low cost and long service life can be obtained.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell (PEMFC), in particular to a PEMFC with a new electrode structure, in particular to improving the existing PEMFC electrode structure, designing a diffusion layer with flow channels or a special The troposphere structure can remove the electrode plate or flatten the electrode plate, significantly reduce the contact transmission resistance between the bipolar plate and the diffusion layer in the battery, thereby obtaining a high-efficiency PEMFC, and belongs to the technical field of fuel cells. Background technique [0002] Hydrogen energy is considered to be an ideal secondary energy source to solve the problem of abandoning wind and electricity, reduce dependence on oil, and realize coordinated solutions to energy and environmental problems. Proton exchange membrane fuel cells (PEMFC) are considered to be the ultimate solution for new energy vehicles. It has attracted great attention and fie...

AI Technical Summary

Problems solved by technology

In short, the bipolar plate in the battery has the characteristics of difficult processing, high occupation cost, and high proportion of volume and mass.

[0006] 2) The bipolar plate causes serious deformation of the carbon paper diffusion layer, which affects the flow channel design and mass and heat transfer

[0007] Since the Young's modulus of the bipolar plate is 13000MPa, which is much larger than that of GDL's 6MPa, and the thickness of the diffusion layer is thin, the deformation caused by the assembly pressure mainly occurs on the GDL, and its porous structure will also be destroyed. , which will have a great impact on the generation of water and the change of GDL porosity, which in turn will affect the properties of GDL such as porosity, gas permeability, mass diffusivity, thermal conductivity and electrical conductivity, bringing new water management Problem: The contact thermal resistance generated by the contact between the MEA and the bipolar plate accounts for 65%-90% of the total thermal resistance. Of course, the addition of PTFE and MPL will also increase the thermal contact resistance

In short, the comprehensive problem is that the life of the battery is severely shortened and the power output efficiency is low.

[0008] To sum up, in the current PEMFC, although the bipolar plate is responsible for the functions of electric conduction, heat conduction, gas conduction, and supporting membrane electrodes, it also sacrifices a huge power density and increases the transmission resistance of the corresponding interface, and because the bipolar plate and The Young's modulus of other material parts is very different, which may cause irreversible damage to other parts during the pressure assembly process, seriously affecting the life of the battery

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