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Bipolar plate for proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, applied in the direction of fuel cells, fuel cell components, battery electrodes, etc., can solve the problem that the conductivity is difficult to meet the increasing requirements of bipolar plates, reduce battery performance and life, Increase the internal resistance of the battery and other issues to achieve the effect of saving valuable modified materials, improving performance and life, and improving performance

Inactive Publication Date: 2010-03-10
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for improved properties at metallurgically bonded surfaces while maintaining their strength against chemicals or environmental factors such as water vapor. It also enhances the durability and lifespan of these components by creating a more resistant coating that prevents damage from harsh environments like those found during fuel cell operation. Overall, this innovative design results in better efficiency and reliance over existing technologies used in batteries (Battery Electrodes).

Problems solved by technology

This patented technical problem addressed in this patant relates to improving the durability and efficiency of PEMF's while reducing their size and costs compared to traditional methods like batteries due to its heavyweight nature. Previous attempts at create stronger materials were limited because they could easily be damaged during handling processes that resulted in contamination issues. To solve these challenges, researchers proposed modifying metals instead of forming them into coatings called cathode protectors.

Method used

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  • Bipolar plate for proton exchange membrane fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The 316L stainless steel plate with a thickness of 0.1mm is punched out of the reaction gas flow channel and the inlet and outlet channels of hydrogen, air and cooling water. The width of the protrusion and depression of the gas flow channel is 1.5mm, and the depth is 2.0mm. The decontamination powder cleans the oil on the surface of the bipolar plate and then dries it.

[0023] Use the 200 series passivation solution from Tianchang Huajin Anticorrosion Cleaning Material Factory for passivation treatment: immerse the bipolar plate in an aqueous solution of stainless steel passivation solution with a volume ratio of 50%, soak for 60s at 20°C, take it out and use deionized water Cleaning; put it into a 3% sodium hydroxide solution by mass and soak for 5 minutes, take it out, clean it with deionized water, and let it dry naturally in the atmosphere.

[0024] Use black electroplating protective paint to coat the entire area of ​​the bipolar plate with flow channels, then he...

Embodiment 2

[0027] The 0.2mm thick TC4 plate (Ti-6Al-4V) is punched out of the reactant flow channel and the inlet and outlet channels of hydrogen, air and cooling water. . Use decontamination powder to clean the oil on the surface of the bipolar plate, wash it with deionized water, and dry it.

[0028] The titanium bipolar plate stamped with flow field grooves was heated in a muffle furnace at 600 °C for 60 min in an air environment to oxidize the surface. Use black electroplating protective paint to coat the entire area of ​​the bipolar plate with flow channels, then heat it in an oven at 60°C for 30min, take it out, and cool it to room temperature. Use 2000# sandpaper to polish off the electroplating protective paint and passivation layer on the raised part of the gas flow channel of the bipolar plate, so that the titanium alloy substrate is exposed at this place, and then perform gold plating. The gold plating solution is: Au (in KAu(CN) 2 form), 6g / L; K 2 HPO 4 , 30g / L; KCN, 30g...

Embodiment 3

[0031] The LY12 aluminum alloy plate with a thickness of 0.3mm is punched out of the reaction gas channel and the inlet and outlet channels of hydrogen, air and cooling water. Dip in a 70°C NaOH solution with a mass ratio of 20% for 30s to remove the oxide film on the surface of the aluminum alloy; then use a volume ratio of 20% HNO 3 The solution was washed for 10s to remove the floating ash on the surface. Then carry out anodic oxidation in a sulfuric acid solution with a volume ratio of 30%, the temperature is 10°C, and the current density is 1.5A / dm 2 , the time is 30min; then coat bisphenol A epoxy resin on the oxide film, and heat at 220°C for 6 hours to cure the resin.

[0032] Use black electroplating protective paint to coat the entire area of ​​the bipolar plate with flow channels, then heat it in an oven at 60°C for 30min, take it out, and cool it to room temperature. Use 2000# sandpaper to polish off the electroplating protective paint and passivation layer on th...

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Abstract

The invention discloses a bipolar plate for a proton exchange membrane fuel cell, which is a metal bipolar plate with an air or cooling liquid passage formed by a bulge and a groove. The surface of the groove of the metal bipolar plate with the air or cooling liquid passage formed by the bulge and the groove is provided with a corrosion-resistant protective layer, and the top surface of the bulgeis provided with a surface modification layer for improving conductivity and corrosion resistance. The invention has the advantages that the surface modification layer has good binding force, compaction and high corrosion resistance and conductivity and can greatly enhance the property and prolong the service life of the bipolar plate in PEMFC, has very economic processing process and mature technology and can effectively reduce the preparing cost of the bipolar plate, only carry out the conductive and corrosion-resistant modification on a platform of the bipolar plate, save a large quantity of valuable modification materials and reduce the cost of the bipolar plate.

Description

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Claims

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Application Information

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Owner SUNRISE POWER CO LTD
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