Bipolar plate, preparation method thereof and fuel cell

A fuel cell and bipolar plate technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of losing the advantages of carbon fiber materials, destroying the mechanical properties of carbon fibers, affecting the electrical conductivity of bipolar plates, etc. Good sex and strength-enhancing effect

Inactive Publication Date: 2020-04-21
浙江锋源氢能科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) For the above-mentioned first technology, the layers of carbon fiber are directly bonded by resin, which will lead to poor conductivity between layers, thereby affecting the conductivity of the bipolar plate;
[0008] (2) For the above-mentioned second technology, the strength of the bipolar plate material prepared by using a variety of carbon materials and adding resin as a binder can only meet the basic needs, but the mechanical properties of the carbon fiber are destroyed during processing, and lost Advantages of carbon fiber materials as bipolar plates

Method used

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  • Bipolar plate, preparation method thereof and fuel cell
  • Bipolar plate, preparation method thereof and fuel cell

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preparation example Construction

[0049] On the one hand, an embodiment of the present invention provides a method for preparing a bipolar plate, see figure 1 As shown, the preparation method specifically includes the following steps:

[0050] S1: Steps of making carbon fiber structure

[0051] Here, the carbon fiber structure in this embodiment is carbon fiber cloth.

[0052] Preferably, this step is specifically weaving carbon fiber filaments into carbon fiber cloth of corresponding size. Preferably, the thickness of the carbon fiber cloth is 0.14-0.22 mm, preferably 0.18-0.20 mm. Preferably, in this step, the carbon fiber filaments are polyacrylonitrile-based carbon fiber filaments; preferably, the carbon fiber filaments have a density of 1.75-1.85 g / cm 3 , preferably 1.78~1.82g / cm 3 , more preferably 1.80g / cm 3 . Preferably, the carbon fiber filaments have a diameter of 6.5-7.5 μm, preferably 6.8-7.2 μm, more preferably 7 μm. Preferably, the resistance of the carbon fiber filament is ≤33Ω / m.

[005...

Embodiment 1

[0070] In this embodiment, a bipolar plate is prepared, and the specific preparation steps are as follows:

[0071] 1) Weaving polyacrylonitrile-based carbon fiber filaments into carbon fiber cloth. Among them, the density of polyacrylonitrile-based carbon fiber is 1.80g / cm 3 , diameter 7μm, resistance ≤33Ω / meter. The thickness of the carbon fiber cloth is 0.18mm.

[0072] 2) Disperse the premixed material of graphene and phenolic resin through a three-roller machine, so that the graphene and phenolic resin are evenly mixed to obtain a binder (ie, an adhesive resin mixed with a conductive material). Wherein, in the binder, the mass fraction of the graphene is 2.3%

[0073] 3) Place 5 layers of carbon fiber cloth in the mold; during the process of placing the carbon fiber cloth, it is necessary to brush the adhesive on the carbon fiber cloth placed on the previous layer, so that any two adjacent layers of carbon fiber cloth pass through the adhesive layer connect.

[0074]...

Embodiment 2

[0078] In this embodiment, a bipolar plate is prepared, and the specific preparation steps are as follows:

[0079] 1) Weaving polyacrylonitrile-based carbon fiber filaments into carbon fiber cloth. Among them, the density of polyacrylonitrile-based carbon fiber is 1.80g / cm 3 , diameter 7μm, resistance ≤33Ω / meter. The thickness of the carbon fiber cloth is 0.18mm.

[0080] 2) Disperse the premixed material of graphene and phenolic resin through a three-roller machine, so that the graphene and phenolic resin are evenly mixed to obtain a binder (ie, an adhesive resin mixed with a conductive material). Wherein, in the binder, the mass fraction of the graphene is 2.3%

[0081] 3) Place 3 layers of carbon fiber cloth in the mold; during the process of placing the carbon fiber cloth, it is necessary to brush the adhesive on the carbon fiber cloth placed on the previous layer, so that any adjacent two layers of carbon fiber cloth pass through the adhesive layer connect.

[0082]...

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Abstract

The invention relates to a bipolar plate, a preparation method thereof and a fuel cell and belongs to the technical field of fuel cells. According to the technical schemes of the invention, the bipolar plate comprises multiple layers of carbon fiber structures and adhesive layers; any two adjacent layers of carbon fiber structures are connected through one adhesive layer; and each adhesive layer comprises a conductive material and adhesive resin, the mass ratio of the conductive material to the adhesive resin being (1-3): 50. According to the bipolar plate of the invention, the strength of thebipolar plate is enhanced on the basis of ensuring the conductivity and air tightness requirements of the bipolar plate, and the practical application prospect for the safe use of the fuel cell is better ensured.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a bipolar plate, a preparation method thereof and a fuel cell. Background technique [0002] A fuel cell (PEMFC) is a power generation device that directly converts the chemical energy in fuel and oxidant into electrical energy through the electrocatalytic reaction on the electrode. [0003] The bipolar plate is an important part of the fuel cell stack; the quality of the bipolar plate directly affects the power generation performance of the fuel cell. In a fuel cell, the cost of the bipolar plate is relatively high, generally accounting for 60% to 70% of the cost of the fuel cell. An ideal bipolar plate should be a good conductor of electricity and heat, with good mechanical properties, good gas barrier properties, low density, and good corrosion resistance. In addition, in a common PEMFC, the flow field and the plate can be integrated or separated. [0004] At present, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0213H01M8/0228
CPCH01M8/0213H01M8/0228Y02E60/50
Inventor 冯翌袁蕴超沈润祝传贺王海峰王利生
Owner 浙江锋源氢能科技有限公司
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