散熱系統對質子交換膜燃料電池堆(PEMFC stacks)極為重要，因為散熱不佳將會造成整體或局部高溫導致質子交換膜缺水，這將會嚴重降低交換膜的質子傳遞能力與電池效能。複合式雙極板為一整合了冷卻流道和反應氣體流道的新式雙極板，其冷卻流道較一般外部散熱系統更接近電池反應區域，應能使質子交換膜燃料電池堆的操作溫度更穩定且均勻分佈。

　　本文建立一具冷卻流道的三維非等溫數值模型，以進行複合式雙極板與傳統雙極板在溫度分布、氣體分布及電流密度的定性分析。由分析結果發現：複合式雙極板的land area過長將會使質子交換膜燃料電池堆的電流密度下降，且電池內還有局部高溫的現象。數值模擬顯示，這些問題可藉由縮短集電肋條與流道寬度獲得改善。此外，塑膠板厚度只會造成整體溫度的變化，對內部溫度分布趨勢並無明顯影響。本文將作為複合式雙極板數值分析的基礎，並為相關領域的研究人員提供參考文獻。

　The cooling system is very important in proton exchange membrane fuel cells (PEMFC) stacks. High global or local temperature due to inefficient cooling would cause membrane dehydration and it would severely decrease the membrane proton conductivity and cell performance. The complex bipolar plate is a new bipolar plate, which integrates the coolant channels and reactant channels on the same plate. The new bipolar plate would make cell temperature stable and temperature distribution uniformly, because its coolant channels are closer to the reaction region of PEMFC than the traditional cooling systems.

　In this study, a three-dimensional, non-isothermal model with cooling channels is developed to analyze the thermal field, species field, and current density for the complex bipolar plate and general (traditional) bipolar plate. The analysis shows that the land area of the new bipolar plate is too long which may reduce the cell performance. The analysis also shows that the high local temperature occurred inside the PEMFC stacks made with the complex bipolar plate. Numerical simulations reveal that these problems could be resolved by decreasing the thickness of electric ribs and the width of fluid channels. The thickness of plastic plate only affects the global temperature and has no obvious influence on the temperature distribution. This study is a foundation of numerical analysis for the complex bipolar plate and a reference for related researchers.

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