薄型金屬雙極板PEMFC單電池製作與測試

Prototyping and Performance Testing of Thin Metallic FEM Fuel Cells

官峰輝(Feng-Hui Kuan)

指導教授 ： 李碩仁

元智大學/工程學院/機械工程學系/碩士(2007年)

https://doi.org/10.6838/YZU.2007.00065

摘要

燃料電池是一種新的能源技術，目前各國正積極展開相關研究工作。為了發展更經濟的質子交換型燃料電池，本研究將焦點著重於流場板的製造；為了克服石墨材料成本高、物理性質較差與加工困難…等特性，本研究採用不鏽鋼作為流場板材料。利用自製的微電化學加工機台，且使用加工速度快、製造成本低的微電化學加工法進行質子交換膜燃料電池微型流場板的加工；並取得試用於量產化的實驗流程與參數。
自製加工機台可分陰極進給裝置、陰陽極夾治具、電源供應系統、電解液噴流、過濾裝置與抗腐蝕鋼骨加工基台等五大部分。本研究使用微電化學方法進行金屬複雜曲面微細加工，討論各部份注意事項與設計重點；並運用CAE工具，對加工基台強度、加工區域流場以及加工電場分別進行模擬分析，取得日後陰極刀具與加工區域流場的設計要點。
運用自製微電化學加工機台於厚度600μm的不鏽鋼薄板，製作出流道深200μm、寬500μm的質子交換膜燃料電池微型流場板。將流場板進行表面電解拋光處理，降低表面阻抗與增加表面平整度。用流場板、MEA、GDL等部件逐一進行電池組裝，在性能測試中對陽極端氣體加濕以維持MEA溼度。由電池測試結果來調整加工參數之需求，並將此微電化學加工方法設計量產製程。

關鍵字

微電化學加工法 ； 燃料電池 ； 模擬

並列摘要

Fuel cell is the focal point of renewable energy research. In order to reduce the fabrication cost of metallic bipolar plates, the micro-ECM process is developed for efficient and effective fabrication of stainless steel bipolar plates.

In this study, a prototype of micro-ECM system is developed which includes cathode feeding mechanism, fixture of electrodes, power supply, electrolyte pumping and filtration, and platform. The platform is analyzed with FEM method to ensure its rigidity. The CFD analysis was performed to ensure the smooth flow of electrolyte inside the fixture channel. Electric field analysis of the electrodes was also conducted in order to provide the effect of process parameters on machining accuracy.

Micro-ECM experiments were conducted on 600 um thick stainless steel plates to obtain flow channels of 200 um deep and 500 um wide. The bipolar plates were electropolished to improve corrosion resistance property. A single cell was assembled to perform cell tests with various operational parameters such as temperature and humidity. Cell performance of 0.25 W/cm2 at 0.35 V was obtained.

並列關鍵字

Micro-ECM ； fuel cell ； analysis

參考文獻

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