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proton exchange membrane fuel cell

A proton exchange membrane, fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems affecting GDL porosity, gas permeability, mass diffusivity, thermal conductivity and electrical conductivity, affecting flow channel design and mass transfer. Heat transfer, high specific gravity of volume and mass, to achieve the effect of improving convection function and residence time, improving battery life, and reducing contact transmission resistance

Active Publication Date: 2021-07-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 higher than that of the GDL 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] PEMFC "diffusion layer with flow channel (de-bipolar plate)" battery structure. Battery structure such as figure 2 shown.

[0050] The main feature of the battery structure is that the bipolar plate of the traditional battery is removed, and the flow channel is designed in the central part of the diffusion layer (GDL). ) or an anode unit; the cathode unit and the anode unit are separated by a proton exchange membrane (membrane), and the periphery can be properly packaged. The stack power density of the battery is ≥ 2.5kW / L, and the service life is significantly longer than that of traditional batteries.

Embodiment 2

[0052] PEMFC "diffusion layer with convective layer (de-bipolar plate)" battery structure. Battery structure such as image 3 shown.

[0053] The main feature of the battery structure is that the bipolar plate of the traditional battery is removed, and the convective layer is designed in the central part of the diffusion layer (GDL). Or an anode unit; the cathode unit and the anode unit are separated by a proton exchange membrane (membrane), and the periphery can be properly packaged. The stack power density of the battery is ≥ 2.5kW / L, and the service life is significantly longer than that of traditional batteries.

Embodiment 3

[0055] The battery structure of PEMFC "planar bipolar plate + convective layer + diffusion layer". Battery structure such as Figure 4 As shown (the upper picture shows the integrated structure of the troposphere / diffusion layer, and the lower picture shows the close contact of the troposphere + diffusion layer).

[0056] The main feature of the battery structure is that it adopts a flat bipolar plate, that is, the side close to the bipolar plate and the diffusion layer is processed into a plane, and a convection layer is added between the bipolar plate and the diffusion layer. The convection layer is made of carbon fiber and porous titanium. , titanium mesh, stainless steel mesh, etc. The catalytic layer is located on both sides of the proton exchange membrane, which constitute the anode and cathode respectively, and the periphery can be properly packaged. The stack power density of the battery is ≥2.5kW / L, and the service life is significantly longer than that of traditiona...

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Abstract

The invention discloses a new type of proton exchange membrane fuel cell. The proton exchange membrane fuel cell can achieve "de-bipolar plate" or "Bipolar plate de-channeling" significantly reduces the contact transmission resistance between the bipolar plate and the diffusion layer in the battery, thereby obtaining a high-efficiency, low-cost, and long-life PEMFC.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0228H01M8/0258
CPCY02E60/50
Inventor 谢志勇梁伊丽
Owner CENT SOUTH UNIV
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