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Double polar plate used for phosphoric acid type fuel cell and method for producing the same

A fuel cell and bipolar plate technology, applied in the direction of fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of pressure operation cracking, low heat resistance temperature, low mechanical strength of carbon plate material bipolar plates, etc.

Inactive Publication Date: 2008-05-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bipolar plate of carbon plate material has low mechanical strength, high porosity and difficult flow field processing. The bipolar plate of graphite-phenolic resin composite material has low heat resistance temperature and severe corrosion during pressurized operation. The brittleness of the bipolar plate and the cracking phenomenon in the pressurized operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to the characteristics of bipolar plates used in phosphoric acid fuel cells, the flow field structure and processing mold were designed, and the width of the flow channel was controlled to be 1.0mm, and the depth of the flow channel was 1.0mm; 450g of graphite, 400g of polyphenylene sulfide resin, poly 30g of tetrafluoroethylene, 70g of polyperfluoroethylene propylene, and 50g of carbon fiber were mixed uniformly by wet ball milling to obtain a powder mixture raw material; 105g of the mixture raw material was weighed and added to a mold, placed in a heating furnace, and cold-pressed under a pressure of 5MPa. For forming, heat up to 310°C at a rate of 3°C / min, apply a pressure of 15MPa under constant temperature conditions, and keep under constant temperature and pressure conditions for 30 minutes; take it out of the heating furnace and quickly place it in tap water to cool to room temperature, and take it out of the mold A graphite-polyphenylene sulfide / fluoror...

Embodiment 2

[0019] Design the flow field structure and process the mold, control the flow channel width to 1.5mm, and the flow channel depth to 1.0mm; weigh 550g of graphite, 300g of polyphenylene sulfide resin, 30g of fusible polytetrafluoroethylene, and 50g of polyfluoroethylene propylene 1. Carbon fiber 70g, use wet ball milling to mix it uniformly to obtain powdery mixture raw material; weigh 105g mixture raw material and add it to the mold, place it in a heating furnace, cold press preform under 3MPa pressure, and heat up at a speed of 5°C / min To 330°C, apply a pressure of 25 MPa under constant temperature conditions, and keep it under constant temperature and pressure conditions for 20 minutes; take it out of the heating furnace and quickly place it in tap water to cool to room temperature, and take it out of the mold to obtain graphite-polyphenylene sulfide / fluororesin Composite bipolar plates. The size of the bipolar plate is 100×100×5mm, and the conductivity is 150~250S.cm -1 , ...

Embodiment 3

[0021] Design the flow field structure and process the mold, control the width of the flow channel to 1.0mm, and the depth of the flow channel to 0.5mm; weigh 500g of graphite, 330g of polyphenylene sulfide resin, 20g of fusible polytetrafluoroethylene, and polyperfluoroethylene propylene 40g, polytetrafluoroethylene 10g, carbon fiber 100g, use wet ball milling to make it mix evenly to obtain powdery mixture raw material; take 105g mixture raw material and add in the mould, be placed in the heating furnace, under the pressure of 4MPa cold press preforming, with Heat up to 320°C at a rate of 4°C / min, apply a pressure of 20 MPa under constant temperature conditions, and keep at constant temperature and constant pressure conditions for 25 minutes; take it out of the heating furnace and quickly place it in tap water to cool to room temperature, and take it out from the mold to obtain graphite - Polyphenylene sulfide / fluororesin composite bipolar plate. The size of the bipolar plat...

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Abstract

The present invention pertains to the field of new energy materials, in particular to a phosphate fuel cell bipolar plate and a preparation method. The phosphate fuel cell bipolar plate takes graphite as a conductive filler, carbon fiber as a reinforcer, the mixture of polyphenylene ether resin and fluorin resin as a binder; the quality percentage of each component is respectively 45-55 percents of graphite, 5-10 percents of carbon fiber, 30-40% of polyphenylene ether resin and 5-10 percents of fluorin resin. The preparation method adopts the one-time hot forming of die casting method with the pressure of 15-25MPa and the insulation time of 20-30min. The bipolar plate provided by the present invention has the advantages of high-temperature resistance, high thermal stability and good corrosion resistance. In addition, the present invention is somewhat hydrophobic, thus omitting hydrophobic materials and drainage in the battery; and has lubrication performance, which is conducive to demolding in the molding process and makes the waste bipolar plate material used repeatedly.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a bipolar plate for a phosphoric acid fuel cell and a preparation method thereof. Background technique [0002] Phosphoric acid fuel cell has the advantages of easy availability of phosphoric acid, mild reaction and wide source of fuel, and has become one of the most mature fuel cells in research and development. It is considered to be the fourth form of power generation after thermal power, water conservancy and nuclear power. The performance and price of bipolar plates for phosphoric acid fuel cells directly affect the performance of the battery stack. At present, they are mainly made of carbon plates, graphite (or carbon powder)-resin composite materials. The bipolar plate of carbon plate material has low mechanical strength, high porosity and difficult flow field processing. The bipolar plate of graphite-phenolic resin composite material has low heat resistance temperature...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/02H01M4/88H01M8/0202H01M8/0226
CPCY02E60/50
Inventor 管从胜张华勇李自强
Owner SHANDONG UNIV
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