均勻流場受力優化矩形質子交換膜燃料電池;Uniform flow field force Optimized rectangular Polymer electrolyte membrane fuel cell

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题名:	均勻流場受力優化矩形質子交換膜燃料電池;Uniform flow field force Optimized rectangular Polymer electrolyte membrane fuel cell
作者:	翁莉芳;Weng, Li-Fang
贡献者:	機械工程學系
关键词:	質子交換膜燃料電池;金屬多孔材;流場設計;矩形流道
日期:	2019-08-20
上传时间:	2019-09-03 16:40:11 (UTC+8)
出版者:	國立中央大學
摘要:	本研究於原實驗室設計之金屬多孔材流道上，設計矩形流道之質子交換膜燃料電池，進而增加燃料電池反應面積，可大幅減少同瓦數電堆/單電池之重量與體積，提升電堆重量及體積功率密度。本研究使用組裝平台並於電池組裝時中心施予一正向力，增加電池受力均勻性，改善電池流場狀況，進而提升電池性能，並利用介面壓力驗證電池內部受壓之均勻性，使用各項流場分析技術(如：壓力降、氣體利用率等)及表面結構分析，探討內部流阻對電池性能之影響，最後進行性能測試，驗證不同正向力下之電池性能。研究結果顯示，當使用矩形流道，使反應面積提升至原方形設計的3倍，重量卻只有原方形設計的1.8倍，提升電池重量功率密度，且使用組裝平台並施予正向力之電池，電池內部中心受壓較均勻，使氣體擴散層及流道接觸更加均勻化。而在流道內部分析中，使用組裝平台並施予200 kgf之電池，於當量比測試中，空氣當量比由3降至2時，無使用組裝平台之電池，0.6 V下之電流密度下降幅度為26 %，使用組裝平台並施予200 kgf之電池，0.6 V下之電流密度下降幅度為10 %，且氣體利用率高達62.9 %。使用組裝平台並施予200 kgf之電池性能於0.6 V下之電流密度可高達1200 mA/cm2，證實此為一成功且實用之設計。 ;In this research, the assembly platform was used for fuel cell assembly. Since the area of the fuel cell is rectangle, a normal force was applied to the center of the fuel cell to distribute the force uniformly, which was verified by checking the interface pressure. Flow field analysis techniques (such as pressure drop, gas utilization, etc.) and surface structure analysis were used to determine the effect of resistance to the cell performance. And performance testing was used to verify fuel cell performance under different forward forces. The results show that when using a rectangular flow channel and the reaction area was increased by three-fold. However the weight of cell only becomes 1.8 times that of the original square design. This greatly increases the weight power density of the fuel cell. The fuel cell which assembling with proper normal force can uniformly make the gas diffusion layer and the flow path in better contact with each other. In the flow field analysis, the assembly platform was used and a fuel cell of 200 kgf was applied. In the stoichiometry test, when the air stoichiometry was reduced from 3 to 2 and the assembly platform was not used, the current density at 0.6 V decreased 26%. However, fuel cell using an assembly platform and applying a 200 kgf normal force, the current density at 0.6 V only reduces 10%. Moreover the gas utilization is as high as 62.9%. The use of an assembly platform and a 200 kgf force achieves a fuel cell performance that reach up to 1200 mA/cm2 at 0.6 V, which confirms that the new design is successful and practical.
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