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Fuel cell gas diffusion layer, electrode, membrane electrode assembly, single cell and preparation method thereof

A fuel cell electrode and gas diffusion layer technology, applied in the direction of fuel cells, battery electrodes, fuel cell additives, etc., can solve the problems of limited bipolar plate processing technology, difficult to process and shape the electrode plate, and low output power, and achieve Effects of improving drainage, increasing water diffusion capacity, and increasing volumetric energy density

Active Publication Date: 2021-05-25
中汽创智科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The performance level of the membrane electrode is sufficient to meet the needs of vehicles. The matching of the gas diffusion layer and the bipolar plate is a difficult point in the design and assembly of the stack. Currently, carbon paper or carbon cloth is used as the gas diffusion layer, but due to carbon paper or carbon cloth The thickness of the bipolar plate is thicker than 150 μm, the transmission of gas and moisture is limited, and the processing technology of the bipolar plate is limited. It is difficult to process the plate with high precision and high processing cycle, and the transmission of moisture and gas is also limited. Stacked in a high density area, the output power is low

Method used

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  • Fuel cell gas diffusion layer, electrode, membrane electrode assembly, single cell and preparation method thereof
  • Fuel cell gas diffusion layer, electrode, membrane electrode assembly, single cell and preparation method thereof
  • Fuel cell gas diffusion layer, electrode, membrane electrode assembly, single cell and preparation method thereof

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preparation example Construction

[0050] The method for preparing a fuel cell membrane electrode assembly as described above specifically includes the following steps:

[0051] Step 1. Preparation of the anode: it is formed by welding a 100-200-mesh porous nickel mesh layer and a nickel substrate;

[0052] Step 2, preparation of the cathode: first adopt the porous nickel mesh layer of 50-80 mesh to weld the nickel substrate, and then prepare the porous nickel mesh layer of 50-80 mesh and the porous nickel mesh layer of 100-200 mesh by cold pressing;

[0053] Step 3, depositing an anode catalyst layer and a cathode catalyst layer respectively on both sides of the proton exchange membrane;

[0054] Step 4: The anode is welded or hot-pressed on the anode catalyst layer, and the cathode is welded or hot-pressed on the cathode catalyst layer.

[0055] A single cell using the above fuel cell gas diffusion layer, the reaction gas of the anode is hydrogen, and the reaction gas of the cathode is oxygen.

Embodiment 1

[0057] The inventor first made an improvement from the gas diffusion layer: using one or two layers of porous nickel mesh as the gas diffusion layer. The reason for choosing nickel mesh is that nickel has good chemical stability, acid and alkali resistance and surface hydrophobicity.

[0058] When the porous nickel mesh layer is one layer, the porous nickel mesh layer is selected from the first porous nickel mesh layer 1 with a pore size of 150 mesh and a thickness of 75 μm.

[0059] When the porous nickel mesh layer is a double layer, the porous nickel mesh layer selects the second porous nickel mesh layer 2 and the third porous nickel mesh layer 10, and the aperture size of the second porous nickel mesh layer is 150 orders, The thickness is 25 μm; the pore size of the third porous nickel mesh layer 10 is 65 mesh, and the thickness is 65 μm.

[0060] In summary, the thickness of the gas diffusion zone is much smaller than that of carbon paper.

Embodiment 2

[0062] The gas diffusion layer prepared in Example 1 is applied to the fuel cell electrode, including: the fuel cell gas diffusion layer and the substrate integrally formed with the fuel cell gas diffusion layer.

[0063] Because the reaction environments of the anode and the cathode are different, the gas diffusion layers of the anode and the cathode are different. Specifically, the anode includes: a first porous nickel mesh layer and a substrate, such as figure 1 As shown, wherein, the pore size of the first porous nickel mesh layer is 150 mesh, and the thickness is 75 μm. The cathode includes a second porous nickel mesh layer, a third porous nickel mesh layer and a substrate, figure 2 shown. The porous nickel mesh layer selects the second porous nickel mesh layer 2 and the third porous nickel mesh layer 10, the aperture size of the second porous nickel mesh layer is 150 orders, and the thickness is 25 μm; The hole diameter of the porous nickel mesh layer 10 is 65 meshes...

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Abstract

The invention discloses a fuel cell gas diffusion layer, an electrode, a membrane electrode assembly, a single cell and a preparation method thereof, and belongs to the technical field of fuel cells. The gas diffusion layer comprises one layer or two layers of porous nickel nets, and the porous nickel nets are used for achieving transmission of gas and moisture in the transverse direction and the longitudinal direction. The porous nickel net is used for replacing carbon paper in the prior art to serve as a gas diffusion layer, the thickness of a gas diffusion area is reduced, the volume energy density of the galvanic pile is improved, nickel net pores are developed, the drainage condition of the galvanic pile under high current density is improved, and the output power is improved. In addition, the nickel net and the substrate are combined through laser welding, the contact resistance between materials is reduced, the output voltage of the membrane electrode can be improved, and the assembly process of the membrane electrode and the galvanic pile is simplified through the two-in-one combination of the diffusion layer and the polar plate.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a fuel cell gas diffusion layer, an electrode, a membrane electrode assembly, a single cell and a preparation method thereof. Background technique [0002] At present, the assembly of the stack mainly includes membrane electrodes, bipolar plates, gas diffusion layers, and other spare parts include end plates, current collector plates and insulating plates. The performance level of the membrane electrode is sufficient to meet the needs of vehicles. The matching of the gas diffusion layer and the bipolar plate is a difficult point in the design and assembly of the stack. Currently, carbon paper or carbon cloth is used as the gas diffusion layer, but due to carbon paper or carbon cloth The thickness of the bipolar plate is thicker than 150 μm, the transmission of gas and moisture is limited, and the processing technology of the bipolar plate is limited. It is difficul...

Claims

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Application Information

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IPC IPC(8): H01M8/0232H01M4/86H01M8/04291H01M8/1004H01M4/88
CPCH01M4/8657H01M4/8807H01M8/0232H01M8/1004H01M8/04291Y02E60/50
Inventor 李丰军周剑光
Owner 中汽创智科技有限公司
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