Fuel cell unipolar plate surface treatment method

A fuel cell and surface treatment technology, applied in the field of surface treatment, can solve the problems of high contact resistance, inability to guarantee accuracy and consistency, rough surface, etc., achieve improvement of contact resistance and flatness, good consistency of treatment effect, and simple operation Effect

Inactive Publication Date: 2018-11-23
BEIJING NOWOGEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the surface of fuel cell unipolar plates prepared by machining, molding, injection molding or stamping is rough, and there are burrs or flashes. Composite unipolar plates are easily enriched on the surface due to binder resin or release agent, making the plates The conductivity is low and the contact resistance is large; if the surface is sanded with sandpaper, the efficiency is low and the speed is slow. In addition, the surface of the electrode plate usually has a flow channel structure, and the accuracy of the flow channel size is high. Sandpaper grinding cannot guarantee accuracy and consistency. After polishing, post-treatment processes such as purging or water cleaning are generally required, and the whole process is complicated and cumbersome

Method used

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  • Fuel cell unipolar plate surface treatment method
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  • Fuel cell unipolar plate surface treatment method

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Experimental program
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Effect test

Embodiment approach 1

[0078] The present embodiment adopts the method for cleaning the surface by the light section method, such as figure 1 shown. Before processing, measure the conductivity, contact resistance and flatness of the plate, which are 85S / cm, 25mΩ·cm2, and 0.08mm, respectively. Ultrasonic cleaning treatment of the surface of the plate takes 1 minute, and then the conductivity, contact resistance and flatness of the treated unipolar plate are tested, and the results are 96S / cm, 20mΩ·cm2, and 0.05mm respectively. , contact resistance, and flatness have been significantly improved, and the surface treatment effect is good.

[0079] In order to confirm that the ultra-cleaning method will not introduce other impurities or cause deterioration of the board material, an X-ray energy spectrometer (EDS) is used to conduct elemental analysis on the surface before and after treatment. Since the resin in the composite plate contains O element, the change of the resin content on the surface of th...

Embodiment approach 2

[0082] The present embodiment adopts the method for cleaning the surface by sandblasting and blasting method, such as figure 2 shown. Before processing, measure the conductivity, contact resistance and flatness of the plate, which are 85S / cm, 25mΩ·cm2, and 0.08mm, respectively. Ultrasonic cleaning treatment of the surface of the plate takes 1 minute, and then the conductivity, contact resistance and flatness of the treated unipolar plate are tested. The results are 90S / cm, 19mΩ cm2, and 0.07mm respectively. It can be found that the conductivity , contact resistance, and flatness are all improved, and the surface treatment effect is good.

[0083] In order to confirm that sand blasting and peening methods will not introduce other impurities or cause deterioration of board materials, X-ray energy spectrometer (EDS) is used to conduct elemental analysis on the surface before and after treatment. Since the resin in the composite plate contains O element, the change of the resin...

Embodiment approach 3

[0086] Present embodiment adopts the method for ultrasonic cleaning surface, as image 3 shown. Before processing, measure the conductivity, contact resistance and flatness of the plate, which are 85S / cm, 25mΩ·cm2, and 0.08mm, respectively. Ultrasonic cleaning treatment of the surface of the plate takes 10 minutes (the number of products processed at the same time is not less than 20 products), and then the conductivity, contact resistance and flatness of the treated unipolar plate are tested, and the results are 95S / cm and 20mΩ respectively ·cm2, 0.1mm, it can be found that the electrical conductivity and contact resistance are significantly improved, and the flatness is slightly reduced, but it meets the needs of the product and the surface treatment effect is good.

[0087] In order to confirm that the ultrasonic cleaning method will not introduce other impurities or cause the board material to deteriorate, an X-ray energy spectrometer (EDS) is used to conduct elemental an...

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Abstract

The invention provides a fuel cell unipolar plate surface treatment method, including the following steps: (1) firstly, moving fuel cell unipolar plates onto a conveyor belt, and performing finishingtreatment; (2) sequentially performing shot blasting or sand blasting on the fuel cell unipolar plates on the conveyor belt, wherein single or multiple nozzles are adopted during the treatment; (3) performing ultrasonic cleaning, immersing multiple fuel cell unipolar plates in an instrument with a chemical preparation, and cleaning the surfaces of the fuel cell unipolar plates through ultrasonic high-frequency vibration; and (4) naturally drying or baking the fuel cell unipolar plates, performing laser cleaning on remaining stains, providing a detection device between each step, removing the fuel cell unipolar plates that meet the conditions, and no longer performing the treatment of the following steps for the qualified fuel cell unipolar plates. The method provided by the invention is simple to operate and high in efficiency, greatly improves the polar plate conductivity, contact resistance and flatness of the surface treatment, does not introduce other impurities, and does not causethe deterioration of polar plate materials.

Description

technical field [0001] The invention relates to a surface treatment method, in particular to a method for surface treatment of a fuel cell monopolar plate. Background technique [0002] At present, the surface of fuel cell unipolar plates prepared by machining, molding, injection molding or stamping is rough, and there are burrs or flashes. Composite unipolar plates are easily enriched on the surface due to binder resin or release agent, making the plates The conductivity is low and the contact resistance is large; if the surface is sanded with sandpaper, the efficiency is low and the speed is slow. In addition, the surface of the electrode plate usually has a flow channel structure, and the accuracy of the flow channel size is high. Sandpaper grinding cannot guarantee accuracy and consistency. After polishing, post-treatment processes such as purging or water cleaning are generally required, and the whole process is complicated and cumbersome. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0204B24B7/06B24B55/06B24C1/00
CPCB24B7/06B24B55/06B24C1/00H01M8/0204Y02E60/50
Inventor 付云鹏王俊杰朱俊娥赵吉陈真赖平化欧阳洵张苹
Owner BEIJING NOWOGEN TECH CO LTD
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