Fabrication of micro-flow channels on graphite composite bipolar plates using microplaning
来源期刊：中南大学学报(英文版)2015年第8期
论文作者：WAN Zhen-ping LIANG De-jie LU Long-sheng TANG Yong
文章页码：2963 - 2970
Key words：microfuel cell; graphite composite bipolar plate; micro-flow channel; microplaning; edge chipping
Abstract: A new method of manufacturing micro-flow channels on graphite composite bipolar plate (GCBPP) microplaning using specially designed multi-tooth tool is proposed. In this method, several or even dozens of parallel micro-flow channels ranging from 100 μm to 500 μm in width can be produced simultaneously. But, edge chippings easily occur on the rib surface of GCBPP during microplaning due to brittleness of graphite composites. Experimental results show that edge chippings result in the increase of contact resistance between bipolar plate and carbon paper at low compaction force. While the edge chippings scarcely exert influence on the contact resistance at high compaction force. Contrary to conventional view, the edge chippings can significantly improve performance of microfuel cell and big edge chippings outperform small edge chippings. In addition, the influence of technical parameters on edge chippings was investigated in order to obtain big, but not oversized edge chippings.
WAN Zhen-ping(万珍平), LIANG De-jie(梁德杰), LU Long-sheng(陆龙生), TANG Yong(汤勇)
(School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China)
Abstract:A new method of manufacturing micro-flow channels on graphite composite bipolar plate (GCBPP) microplaning using specially designed multi-tooth tool is proposed. In this method, several or even dozens of parallel micro-flow channels ranging from 100 μm to 500 μm in width can be produced simultaneously. But, edge chippings easily occur on the rib surface of GCBPP during microplaning due to brittleness of graphite composites. Experimental results show that edge chippings result in the increase of contact resistance between bipolar plate and carbon paper at low compaction force. While the edge chippings scarcely exert influence on the contact resistance at high compaction force. Contrary to conventional view, the edge chippings can significantly improve performance of microfuel cell and big edge chippings outperform small edge chippings. In addition, the influence of technical parameters on edge chippings was investigated in order to obtain big, but not oversized edge chippings.
Key words:microfuel cell; graphite composite bipolar plate; micro-flow channel; microplaning; edge chipping
