燃料電池金屬雙極板沖壓製程參數之研究

Study on Parameters in the Stamping Process of the Metallic Bipolar Plate for Fuel Cells

周廷彥(TING-YAN ZHOU)

指導教授 ： 陳永松

國立中正大學/工學院/機械工程學系/碩士(2013年)

摘要

雙極板是質子交換膜燃料電池中相當重要的組件，傳統上雙極板是使用石墨作為材料，但刻劃氣體流道以及滲膠處理花費了大量的時間和金錢。最近研究多以金屬雙極板為發展目標，致力於降低製作雙極板的成本、減少製作時間、提供更佳的強度、氣密等等性質，其中採用不鏽鋼是相當好的選擇。文獻指出，透過優化流道設計可以提供燃料電池更好的性能以及更高的機械強度，但目前對於金屬雙極板研究多集中在保護雙極板不受腐蝕影響。本論文透過有限元素法與流道沖壓實驗模擬流道中不同的導角、斜角、寬度，找出一組適合進行沖壓製程的流道尺寸。並且由於直線流道方向過於單一，會使得金屬雙極板在沖壓結束後回彈導致雙極板彎曲，故將直線流道改良成波浪形並以模擬找出適合的彎曲角度。 在模擬與實驗結果中均可發現導角和斜角是影響流道成形的重要參數，而流道寬度對於流道的成形較無影響，所以在調整這些參數後可找出較佳的流道尺寸。波浪型流道的沖壓模擬顯示彎曲角度增加將會增加塑性應變較大的區域。

關鍵字

金屬雙極板 ； 沖壓製程˙ ； 燃料電池

並列摘要

Bipolar plates are important components in PEMFCs. They are commonly made of graphite; however, channel machining takes much time and cost. Recently many research pay attention to metallic bipolar plates. In order to reduce costs, shorten manufacturing cycle, and provide better strength and airtight, stainless steel is one of good candidate materials. Some research showed a flow optimization field design can improve PEMFCs powerful performance and strength; however, most of research focus on overcoming corrosion on metallic bipolar plates. In this study, a finite element model and experiments are used to investigate the effects of fillet radius, channel width, draft angle in stamping process. Because the straight flow channel design has single direction, metallic plates will spring back when the stamping process is finished; thus wave like flow field design can relief the spring back effect. Both modeling and experimental results indicate the draft angle and fillet radius have significant influence on the formability than other parameters do in stamping process. Increasing angle of turn will lead to spread large plastic strain zone.

並列關鍵字

Fuel Cells ； Stamping Process ； Metallic Bipolar Plate

參考文獻

[1] J. Marcinkoski, B. D. James, J. a. Kalinoski, W. Podolski, T. Benjamin, and J. Kopasz, “Manufacturing process assumptions used in fuel cell system cost analyses,” Journal of Power Sources, vol. 196, no. 12, pp. 5282–5292, Jun. 2011.

[2] X. Li and I. Sabir, “Review of bipolar plates in PEM fuel cells: Flow-field designs,” International Journal of Hydrogen Energy, vol. 30, no. 4, pp. 359–371, Mar. 2005.

[3] I. Bar-on, R. Kirchain, and R. Roth, “Technical cost analysis for PEM fuel cells,” Journal of Power Sources, vol. 109, no. 2002, pp. 71–75, 2004.

[4] A. Hermann, T. Chaudhuri, and P. Spagnol, “Bipolar plates for PEM fuel cells: A review,” International Journal of Hydrogen Energy, vol. 30, no. 12, pp. 1297–1302, Sep. 2005.

[6] E. Middelman, W. Kout, B. Vogelaar, J. Lenssen, and E. de Waal, “Bipolar plates for PEM fuel cells,” Journal of Power Sources, vol. 118, no. 1–2, pp. 44–46, May 2003.