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Fuel cell bipolar plate and method

A fuel cell and bipolar plate technology, which is applied in the direction of fuel cells, fuel cell additives, electrolyte treatment of solid electrolyte batteries, etc., can solve the problem of unsatisfactory super-hydrophobic effect, achieve high-efficiency hydrophobicity, and improve performance , Enhance the effect of oxygen supply

Active Publication Date: 2020-02-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned methods for preparing hydrophobic bipolar plates all adopt the method of preparing thin films or coatings, but studies have proved that even if perfluoroalkane, the substance with the lowest surface energy, is used to modify the solid surface, the maximum surface contact angle is less than 120°, which can It can be seen that the effect of reducing the surface free energy to obtain superhydrophobicity on a smooth surface is not very ideal

Method used

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preparation example Construction

[0046] According to the preparation method of the bipolar plate of the fuel cell, the forming method of the concave-convex composite structure 3 can be stamping and forming of a finished model or laser processing and forming on the surface of the flow channel of the bipolar plate.

[0047] When the concave-convex composite structure 3 is processed on the flow channel surface of the bipolar plate by laser processing, the specific steps are: perform nanosecond laser reprocessing on the flow channel surface 2 of the bipolar plate to obtain a concave-convex composite structure on the flow channel surface 3 bipolar plates.

[0048] The parameters of the nanosecond laser are: the divergence angle is less than 1mrad, the output beam quality M 2 ≤4, the spot diameter is 40μm, the wavelength is 1064nm, the power is 30W, the single pulse energy is 1mJ, the pulse width is 1-100ns, and the repetition frequency is 1-100kHz.

[0049] When the concave-convex composite structure on the flow ...

Embodiment 1

[0052] Such as figure 1 , 2 , 7, 8, a fuel cell bipolar plate, the bipolar plate material is titanium alloy, length 60mm, width 40mm, thickness 5mm. The structure of the flow channel is a parallel straight channel structure, the width of the flow channel is 1mm, and the depth of the flow channel is 1mm. The flow channel is connected to the feed port 4 and the discharge port 5 respectively, and the flow channel surface 2 of the flow channel is distributed with a plurality of concave-convex composite structures 3, and these structures are arranged in an orderly array on the entire flow field surface, so that the reacted fluid It can be discharged directly through the flow channel of the bipolar plate. The specific geometric parameters of the concave-convex composite structure 3 are: pit diameter d=23 μm, pit depth h=8 μm, protrusion height H=30 μm, convex shape top diameter D=278 μm, and the distance between the centers of two adjacent concave-convex composite structures The ...

Embodiment 2

[0055] Such as image 3 , 4 , 7, 8, a fuel cell bipolar plate, the bipolar plate material is titanium alloy, length 60mm, width 40mm, thickness 5mm. The structure of the flow channel is a serpentine flow channel structure, the width of the flow channel is 1 mm, and the depth of the flow channel is 1 mm. The flow channel is connected to the feed port 4 and the discharge port 5 respectively, and the flow channel surface 2 of the flow channel is distributed with a plurality of concave-convex composite structures 3, and these structures are arranged in an orderly array on the entire flow field surface, so that the reacted fluid It can be discharged directly through the flow channel of the bipolar plate. The specific geometric parameters of the concave-convex composite structure are: pit diameter d = 200 μm, pit depth h = 60 μm, protrusion height H = 1 μm, convex topographic diameter D = 1 μm, and the distance between the centers of two adjacent concave-convex composite structure...

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Abstract

The invention provides a fuel cell bipolar plate and a method. A plurality of convex-concave composite structures are arranged on a runner surface of a runner on a surface of the bipolar plate and arearranged in an array way, the convex-concave composite structures are protruding semi-spherical bodies, and a circle of pit with semi-circular radial section is arranged at a circumference of a bulge. The fuel cell bipolar plate is simple to process and manufacture, and only the convex-concave composite structures are arranged at a surface of a flow field of the bipolar plate; by the convex-concave composite structures, a liquid drop contact angle can be greatly increased, the hydrophobicity of the runner surface is improved, even the bipolar plate obtains super-hydrophobicity, so that moisture is difficult to remain on a wall of the flow field, the circulation of the flow field is maintained, and the performance of a fuel cell is improved; convection can be caused when a fluid passes through, and the oxygen supply from the flow field to a catalyst layer is greatly improved so as to cause higher local concentration and smaller concentration polarization; and eddy is generated betweentwo of the convex-concave composite structures when the fluid flows through the convex-concave composite structures, the moisture accumulated in a gas diffusion layer is removed by an inertia effect,so that water management is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a fuel cell bipolar plate and a method. Background technique [0002] With the development of science and technology, the consumption of traditional energy is increasing day by day, and the environment is deteriorating rapidly. Therefore, the development and innovation of energy and new energy materials will be an important issue that must be solved in the new era. Fuel cells can directly convert the chemical energy stored in fuel and oxidant into electrical energy, with high conversion efficiency, environmental friendliness, and high reliability, and are considered to be the first-choice high-efficiency sustainable power generation technology in the century. Among all kinds of fuel cells, proton exchange membrane fuel cell is a kind of fuel cell. It has the advantages of fast start-up, long life and high specific power. It is known as an efficient, clean, economic...

Claims

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Application Information

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IPC IPC(8): H01M8/0258H01M8/0265H01M8/04291B21D22/04B21D37/20B23K26/364
CPCH01M8/0258H01M8/0265H01M8/04291B21D37/20B21D22/04B23K26/364Y02P70/50Y02E60/50
Inventor 尹必峰许晟解玄贾和坤唐捷旭陈明山董非王楠
Owner JIANGSU UNIV
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