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Gas diffusion layer, proton exchange membrane fuel cell and power assembly

A gas diffusion layer and proton exchange membrane technology, applied in fuel cells, battery electrodes, circuits, etc., can solve problems such as flooding reactions and unevenness, achieve optimal water distribution, broad application prospects, and alleviate the phenomenon of "flooding" Effect

Pending Publication Date: 2022-04-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above problems, the present invention proposes a gas diffusion layer, a proton exchange membrane fuel cell and a power assembly. The present invention improves the structure of the gas diffusion layer, effectively promotes the discharge of water and reduces the resistance of gas transmission, and solves the current problem. There are problems of "water flooding" and uneven response when the technology outputs high power

Method used

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  • Gas diffusion layer, proton exchange membrane fuel cell and power assembly
  • Gas diffusion layer, proton exchange membrane fuel cell and power assembly
  • Gas diffusion layer, proton exchange membrane fuel cell and power assembly

Examples

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Embodiment 1

[0046] A gas diffusion layer for a proton exchange membrane fuel cell, comprising an anode diffusion layer and a cathode diffusion layer, the anode diffusion layer is close to the anode flow channel 12, and the cathode diffusion layer is close to the cathode flow channel 10;

[0047] The anode diffusion layer has a uniform pore structure;

[0048] The cathode diffusion layer has a variable pore structure, and the porosity of the pore structure increases gradually along the fluid flow direction;

[0049] And the part of the cathode diffusion layer corresponding to the position of the cathode flow channel 10 is provided with several through holes, and the diameter of the through holes increases gradually along the fluid flow direction.

[0050] The pore structure is made by a viscous mixture including carbon powder, isopropanol, lithium carbonate and polytetrafluoroethylene as a hydrophobic substance, and the viscous mixture is coated on the carbon paper according to the gradient ...

Embodiment 2

[0059] Proton exchange membrane fuel cell stacks, such as image 3 As shown, the cathode flow channel 10 and the anode flow channel 12 of the battery are respectively straight channels and bipolar plates with serpentine flow, a catalytic layer for enhancing the battery reaction, a proton exchange membrane for mass transfer and a gas diffusion layer .

[0060] The porosity of the gas diffusion layer conforms to the linear law, and the diffusion layer is vertically perforated according to the Peel growth curve and the Gompertz growth curve; in addition, the diffusion layer is treated with hydrophobicity, and the resistance and water resistance during gas transmission are improved by this method. Manage the situation to ensure the consistency of water distribution in the direction of gas flow.

[0061] In this embodiment, the total length of the proton exchange membrane fuel cell is L, the length ranges from 750 to 900 mm, the width is B, and the range is 500 to 650 mm, the thic...

Embodiment 3

[0082] A power assembly or power equipment includes the proton exchange membrane fuel cell of the second embodiment, such as construction machinery equipment such as trucks and tractors.

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Abstract

The invention provides a gas diffusion layer, a proton exchange membrane fuel cell and a power assembly, the gas diffusion layer comprises an anode diffusion layer and a cathode diffusion layer, the anode diffusion layer is close to an anode flow channel, and the cathode diffusion layer is close to a cathode flow channel; a plurality of pore structures are uniformly distributed in the anode diffusion layer; a plurality of pore structures are distributed in the cathode diffusion layer, and the porosity of the pore structures is increased in a gradient mode in the fluid flowing direction; a plurality of through holes are formed in the part, corresponding to the position of the cathode flow channel, in the cathode diffusion layer, and the hole diameters of the through holes are increased in a gradient mode in the fluid flowing direction. By improving the structure of the gas diffusion layer, water discharge is effectively promoted, gas transmission resistance is effectively reduced, and the problems of water logging and non-uniform reaction of a high-power fuel cell power assembly are solved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a gas diffusion layer, a proton exchange membrane fuel cell and a power assembly. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Fuel cell is a new type of clean power device, which has the advantages of low operating temperature, zero pollution, and no corrosion. It has always been quite popular in the research field of power engineering, especially in the application of zero emissions. The fuel cell can directly convert the chemical energy in the fuel into electrical energy through a chemical reaction. The reaction product is only water, and has high energy density, long battery life, and high output power. Therefore, it is used in many occasions that require a large amount of power and is used It is considered to be one of t...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/1006
CPCY02E60/50
Inventor 闫伟程植源李嘉颀周荣良李国祥纪嘉树
Owner SHANDONG UNIV
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