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Gas diffusion layer of proton exchange membrane fuel cell

A technology of gas diffusion layer and proton exchange membrane, which is applied in the direction of fuel cells, electrical components, battery electrodes, etc., can solve the problems of large thickness of gas diffusion layer, reduction of stack mass and volume power density, high manufacturing cost, etc., and achieve optimal water efficiency. Management and thermal management, ensuring consistency, increasing the effect of reactant gas mass transfer

Active Publication Date: 2019-08-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas diffusion layer has a large thickness and high manufacturing cost, which reduces the mass and volume power density of the stack, and the mechanical metal fiber and carbon fiber composite structure, the metal fiber will inevitably puncture the carbon fiber during the assembly process and cause mechanical damage

Method used

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  • Gas diffusion layer of proton exchange membrane fuel cell
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  • Gas diffusion layer of proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The gas diffusion layer 1 of the proton exchange membrane fuel cell has a thickness of 200 μm and an average porosity of 0.79. Suitable for straight or meandering channels, such as figure 1 , figure 2 , image 3 , Figure 5 with Image 6 As shown, the gas diffusion layer 1 of the proton exchange membrane fuel cell is made of carbon fibers, and the entire gas diffusion layer needs to undergo hydrophobic treatment to ensure its drainage performance. Gradient distribution of hydrophobic substances 2 along the direction from the inlet to the outlet of the straight or meandering flow channel, the content of hydrophobic substances gradually increases, and the mass content of polytetrafluoroethylene is in the range of 19-21wt%. figure 1 with image 3 In , the darker the color, the higher the content of hydrophobic substance 2. The structures of the gas diffusion layer structure 3 under the pole plate ridge and the gas diffusion layer structure 4 under the pole plate flo...

Embodiment 2

[0055] The gas diffusion layer of proton exchange membrane fuel cell, its structure is basically the same as embodiment 1, as Figure 4 As shown, the difference is that this embodiment is suitable for the serpentine flow channel, and the content of the hydrophobic substance 2 in the gas diffusion layer gradually increases on different flow channels along the direction from the inlet end to the outlet end. The water content in different flow channels is different in the direction from the inlet end to the outlet end of the channel, and the water content in the flow channel increases gradually from the inlet end to the outlet end, so the content distribution of the hydrophobic substance 2 in the gas diffusion layer can ensure that the water distribution in the fuel cell is consistent sex.

[0056] The invention can improve the consistency of water distribution and temperature distribution of the straight or meandering channel fuel cell in the working state, improve the heat diss...

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Abstract

The invention relates to a gas diffusion layer of a proton exchange membrane fuel cell. The gas diffusion layer comprises a hydrophobic medium in a gradient distribution in the direction of a flow channel in a plane, and the uniformity of water distribution in the gas diffusion layer during the reaction of a cell is ensured. The fiber arrangement in a direction perpendicular to the flow channel direction in the plane can improve the thermal conductivity ability between the gas diffusion layer and an electrode plate. The porosities in plane penetrating direction are in a gradient arrangement, and the transfer of cell reaction water from a lower surface to an upper surface of the gas diffusion layer is facilitated. The designs of electrode plate ridge lower and flow channel lower gas diffusion layer structures are different, the ridge lower gas diffusion layer structure is concave, the too small porosity in the gas diffusion layer caused by excessive compression is prevented, and the water accumulation in a ridge lower gas diffusion layer is reduced. Compared with the prior art, the consistency of water and heat in the gas diffusion layer can be effectively ensured, the water drainage and heat dissipation capacity of the fuel cell are enhanced, the mass transfer of reaction gas in the cell is increased, and the reaction efficiency of the cell is improved.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a gas diffusion layer of a proton exchange membrane fuel cell. Background technique [0002] Energy is the basis for the survival and development of modern society. With the continuous progress of human society, fossil fuels such as coal and oil and natural gas that humans can survive are gradually being exhausted. Hydrogen fuel is considered to be a clean energy source for sustainable development in the future. Due to its advantages such as high energy efficiency and low emissions, fuel cells, Become the most promising energy supply devices, especially for automotive applications, because of their high energy density at low temperature, fast start-up, zero emissions and system stability. It is a new type of energy supply device with high efficiency and environmental protection. [0003] The key component of fuel cell membrane electrode assembly is mainly composed of gas diffusion lay...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/0234
CPCH01M8/0234H01M4/8636Y02E60/50
Inventor 邱殿凯周子涵李红涛彭林法来新民
Owner SHANGHAI JIAO TONG UNIV
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