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Fuel cell gas diffusion layer and processing method

A gas diffusion layer and fuel cell technology, which is applied to fuel cells, fuel cell parts, electrical components, etc., can solve the problems of large energy consumption, complex systems, shortening the cruising range of fuel cell vehicles, etc., and achieve long service life, The effect of enhancing transport and accelerating the rate of reaction heat release

Active Publication Date: 2021-07-27
JIANGSU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The other is to preheat the stack and its internal plates and membrane electrodes by means of external power supply electric heating or hydrogen catalytic combustion heat release. battery car range

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

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Embodiment 1

[0052] Such as Figure 1-4 As shown, the gas diffusion layer 1 is made of carbon paper with a length of 10 mm, a width of 2.4 mm, and a thickness of 0.4 mm. The depth of the elliptical groove microstructure 2 in the gas inlet direction H1 = 50 μm, the depth of the elliptical groove microstructure in the direction of the gas outlet H2 = 100 μm; the angle θ = 5° at the edge of the groove microstructure 2 = 5°; 4 functions selected by laser micromachining The point distance from the groove boundary is 1 μm, and the distance between two adjacent points is 30 μm. The deburring treatment methods used are: ultrasonic cleaning, sputter cleaning, and glow cleaning for 1 min each. In this embodiment 1, the elliptical groove microstructure 2 processed on the surface of the cathode gas diffusion layer of the fuel cell close to the bipolar plate by ultrafast laser, select at least 4 action points around any elliptical groove microstructure 2 for laser In micromachining, the laser and the ...

Embodiment 2

[0054] Such as Figure 5-6 As shown, the gas diffusion layer 1 is made of carbon paper with a length of 10 mm, a width of 2.4 mm, and a thickness of 0.4 mm. The depth of the elliptical groove microstructure 2 increases along the gas flow direction with a gradient of 0.5%-1%, and the distance between the centers of the elliptical groove microstructures 2 adjacent to the gas inlet direction is greater than that of the gas outlet direction adjacent to the ellipse The center-to-center distance between groove microstructures 2 . The depth of the elliptical groove microstructure 2 in the gas inlet direction is H1=15μm-100μm, and the depth of the elliptical groove microstructure 2 in the gas outlet direction is H2=25μm-200μm; the angle θ=5° at the edge of the elliptical groove microstructure 2 is 5°; The four action points selected for processing are 1 μm away from the groove boundary, and the distance between two adjacent points is 30. The deburring treatment methods used are: ultr...

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Abstract

The invention provides a fuel cell gas diffusion layer and a processing method. A plurality of elliptical groove microstructures with different depths and intervals are distributed on the surface of one side, close to a bipolar plate, of the gas diffusion layer; and the depth of the elliptical groove microstructure close to the gas inlet is smaller than that of the elliptical groove microstructure close to the gas outlet. Liquid water on the surface of the gas diffusion layer can be discharged more easily by changing the microstructure, close to the surface of the bipolar plate, of the cathode gas diffusion layer, the interval in the inlet direction of the groove cathode is larger than that in the outlet direction, and the depth of the groove in the inlet direction is smaller than that in the outlet direction, so that the fuel cell is prevented from being flooded.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell gas diffusion layer and a processing method thereof Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is considered as one of the most promising energy sources because of its high efficiency and power density, as well as low emissions, noise and vibration. Due to these advantages, PEMFCs have been extensively studied and achieved significant achievements in recent decades. Nevertheless, there are still some technical challenges to be solved, among which water management and cold start are key issues. The cold start of fuel cells in winter has become one of the key technical bottlenecks hindering the commercialization of fuel cells, and is the biggest challenge for fuel cell vehicles in winter. During the reaction process of the fuel cell, water is continuously generated, and the water will freeze below 0°C, and the ice has the property of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0247H01M8/026H01M8/04119
CPCH01M8/0258H01M8/026H01M8/04156Y02E60/50
Inventor 贾和坤俞咏昇尹必峰董非解玄许晟
Owner JIANGSU UNIV
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