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Fuel cell assembly and preparation method thereof

A fuel cell and component technology, which is applied to fuel cell parts, fuel cells, electrical components, etc., can solve problems such as large interface resistance and unfavorable overall power density of the stack

Active Publication Date: 2018-05-01
BEIJING IN POWER NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In practical applications, the bipolar plate and the gas diffusion layer are usually assembled separately by preparing the bipolar plate and the gas diffusion layer, and then the end plate is fastened to realize the assembly of the bipolar plate and the gas diffusion layer. The interface resistance between them is relatively large, which is not conducive to improving the overall power density of the stack

Method used

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  • Fuel cell assembly and preparation method thereof

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preparation example Construction

[0042] On the other hand, an embodiment of the present invention provides a method for preparing a fuel cell assembly as described above, including:

[0043] The organic slurry is spun on one side surface of the bipolar plate by an electrospinning process, and the organic slurry layer formed on the one side surface of the bipolar plate is carbonized by calcination, and formed after the carbonization treatment The interface between the gas diffusion layer and the bipolar plate is combined in the form of a compound or a solid solution.

[0044]An embodiment of the present invention provides a method for preparing a fuel cell assembly, in which an organic slurry layer is spun on one side of the bipolar plate by using an electrospinning process, and the organic slurry layer is carbonized by calcination , the gas diffusion layer made of carbon fiber material can be obtained, and at the same time, the interface between the carbon fiber material and the bipolar plate can be combined ...

Embodiment 1

[0059] 1. Preparation of electrospinning solution:

[0060] The mass fraction of ferric nitrate (analytical pure AR) is 3%, the mass fraction of absolute ethanol (analytical pure) is 31%, the mass fraction of deionized water is 28%, and the mass fraction of polyvinylpyrrolidone is 38% for use. The electrospinning solution was prepared with a viscosity of 200dPa·s.

[0061] 2. Preparation of gas diffusion layer:

[0062] The electrospinning voltage is controlled to be 20kV, and the electrospinning time is 1-30min. A flow channel with a width of 2 mm is engraved on the carbon bipolar plate, and a polymer fiber layer with a thickness of 5 μm is spun on the side of the structural layer forming the flow channel away from the surface of the bipolar plate;

[0063] Place the bipolar plate with the polymer fiber layer at 280°C, pre-oxidize it in the air for one hour, then put it in a high-temperature furnace, and calcinate it at 1000°C for 60 minutes in an inert atmosphere (argon or...

Embodiment 2

[0066] 1. Preparation of electrospinning solution:

[0067] The mass fraction of cobalt nitrate (analytical pure AR) is 4%, the mass fraction of DMF (analytical pure) is 20%, the mass fraction of deionized water is 25%, and the mass fraction of polyethylene is 51%. , its viscosity is 800dPa·s

[0068] 2. Preparation of gas diffusion layer:

[0069] The electrospinning voltage is controlled to be 20kV, and the electrospinning time is 1-30min. A flow channel with a width of 20 microns is printed on the metal bipolar plate, and a polymer fiber layer with a thickness of 20 μm is spun on the side of the structural layer (carbon conductive paste) forming the flow channel away from the surface of the bipolar plate ;

[0070] Place the bipolar plate with the polymer fiber layer at 280°C, pre-oxidize it in the air for one hour, then put it into a high-temperature carbonization furnace, and calcinate it at 500°C for 40 minutes to form a carbon fiber layer (85% porosity, pore diameter...

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Abstract

The invention relates to the technical field of fuel cells, and particularly relates to a fuel cell assembly and a preparation method thereof, which can effectively reduce the interface resistance between a bipolar plate and a gas diffusion layer and improve the overall power density of a stack. The embodiment of the invention provides the fuel cell assembly, comprising the bipolar plate and the gas diffusion layer arranged on one side of the bipolar plate, wherein the gas diffusion layer and an interface of the bipolar plate are combined by forming a compound or a solid solution. The embodiment of the invention is used for the preparation and assembly of fuel cells.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell assembly and a preparation method thereof. Background technique [0002] A fuel cell is referred to as a stack for short, and is mainly composed of a bipolar plate, a gas diffusion layer, a membrane electrode, a current collector plate, and an end plate. Among them, the role of the bipolar plate and the gas diffusion layer is to realize the uniform mass transfer of the reactants, the smooth output of the product, the electron conduction, etc., and play a very important role in the overall structure of the stack. The function of the bipolar plate is mainly to realize the macroscopic mass transfer of reactants and products. The gas diffusion layer generally adopts carbon paper or carbon cloth with microstructure, which can further uniformly transport the reactants to the membrane electrode and transfer the product water to the membrane electrode. Rapid separation wi...

Claims

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Application Information

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IPC IPC(8): H01M8/0202H01M8/0234H01M8/0245H01M8/026
CPCH01M8/0202H01M8/0234H01M8/0245H01M8/026Y02E60/50Y02P70/50
Inventor 方芳刘敏胜
Owner BEIJING IN POWER NEW ENERGY
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