Fuel cell gas diffusion layer structure and processing method thereof

A gas diffusion layer and fuel cell technology, applied in the direction of electrical components, battery electrodes, structural parts, etc., can solve the problems of unfavorable large-scale commercialization, long time consumption, cumbersome processing technology, etc., and achieve the benefit of reactant gas flow wetting , reduce the amount of water, increase the effect of specific surface area

Active Publication Date: 2020-12-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above patents are helpful to improve the flooding phenomenon of fuel cell gas diffusion layer, but the processing technology is too cumbersome and time-consuming, which is not conducive to large-scale commercial promotion

Method used

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  • Fuel cell gas diffusion layer structure and processing method thereof
  • Fuel cell gas diffusion layer structure and processing method thereof
  • Fuel cell gas diffusion layer structure and processing method thereof

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Embodiment 1

[0036] Such as figure 1 with 2 As shown, in the fuel cell gas diffusion layer structure of the present invention, the gas diffusion layer 1 is the base layer on the side close to the bipolar plate, and the surface of the gas diffusion layer 1 is provided with a number of groove textures 2 interlaced and connected to each other. A plurality of interconnected groove textures 2 divide the surface of the gas diffusion layer 1 into grids, which are used to eliminate the phenomenon of electrode flooding. A plurality of groove textures 2 that are interlinked with each other include groove textures that are parallel or nearly parallel to the flow direction, and groove textures that are perpendicular to the flow direction. In Example 1, the groove texture parallel to the flow direction and the groove texture perpendicular to the flow direction have the same cross-sectional area. The material of the base layer of the gas diffusion layer 1 is carbon black paper, and the specific dimens...

Embodiment 2

[0039] Such as figure 1 with 3 As shown, in the fuel cell gas diffusion layer structure of the present invention, the material of the base layer of the gas diffusion layer 1 is carbon fiber, and the cross-sectional shape of the groove texture 2 is rectangular; the specific dimensions are: length 30mm, width 30mm, thickness 1mm. The specific dimensions of the groove texture 2 are: the depth of the groove texture 2 is H=20 μm, the distance between adjacent groove textures 2 is S=500 μm, and the cross-sectional area of ​​the groove texture parallel to the flow direction is larger than that of the groove perpendicular to the flow direction For the cross-sectional area of ​​the texture, the width D of the groove texture perpendicular to the flow direction is 100 μm, and the width of the groove texture parallel to the flow direction is 1.5D. The groove texture 2 accounts for 47.98% of the surface area of ​​the entire gas diffusion layer base layer. The groove structure on the surf...

Embodiment 3

[0042] Such as figure 1 , 4 As shown in and 5, in the fuel cell gas diffusion layer structure of the present invention, the material of the base layer of the gas diffusion layer 1 is carbon fiber, and the cross-sectional shape of the groove texture 2 is trapezoidal; the specific dimensions of the gas diffusion layer 1 are: length 50mm, width 50mm, 1.5mm thick. The specific size of trapezoidal groove texture 2 is: trapezoidal groove texture 2 width D 上底 =50μm, D 下底 = 30 μm, the depth H of the groove texture 2 = 30 μm, and the distance S between adjacent groove textures 2 = 250 μm. The cross-sectional area of ​​the groove texture 2 along the flow direction expands gradually and then tapers along with the flow direction. The cross-sectional area at both ends of the groove texture 2 along the flow direction changes gradually, and the cross-sectional area in the middle of the groove texture 2 along the flow direction remains constant; the cross-sectional area in the middle of t...

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Abstract

The invention provides a fuel cell gas diffusion layer structure and a processing method thereof, a gas diffusion layer is a substrate layer close to one side of a bipolar plate, and the surface of the gas diffusion layer is provided with a plurality of mutually staggered and communicated groove textures, the cross section area of the groove texture in the flowing direction in the groove textureswhich are communicated in a staggered mode is gradually increased and then gradually reduced in the flowing direction, wherein the areas of the cross sections of the two ends of the groove texture inthe flow direction are gradually changed, the area of the cross section of the middle of the groove texture in the flow direction is kept unchanged, and the area of the cross section in the middle ofthe groove texture is 1.5-3 times of the minimum area of the cross sections at the two ends. The trench texture can enable liquid water to leave the cathode, eliminate the electrode flooding phenomenon, allow a proper amount of water to wet airflow, and keep the membrane electrode wet.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell gas diffusion layer structure and a processing method thereof. Background technique [0002] In recent decades, traditional energy such as coal and oil has been used in large quantities, causing serious environmental pollution and the depletion of natural resources. Therefore, we are eager for a clean new energy with high efficiency, energy saving, low pollution and low emission. With the increasing maturity of modern technology, people put their research focus and energy into the research of fuel cells. As an energy conversion device, fuel cells have high conversion efficiency and are known as the ideal source of electric energy in the future. Proton exchange membrane fuel cell is the most common and most widely used type of fuel cell. It has attracted much attention in recent years due to its advantages such as low operating temperature, high power density, fast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8605H01M4/8807Y02E60/50
Inventor 尹必峰陈明山解玄贾和坤许晟唐捷旭陈鑫董非
Owner JIANGSU UNIV
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