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<p>In the parallel flow field of proton exchange membrane fuel cell(PEMFC), many existing process multi‑criteria parameter selection methods are currently limited to two-dimensional and uniform-depth designs. This approach aims to address the issues of uneven reactant distribution and the risk of flooding. However, with the advent of rapid laser processing technology, it has provided significant advantages for the formation of three-dimensional flow fields with non-equidistant depths. This technological breakthrough can bring several crucial benefits. For instance, it has a very high precision, does not require contact with the material during processing, and its flexibility is enhanced. At the same time, it significantly reduces the need for secondary processing. The three-dimensional flow field structure of 316&#xa0;L stainless steel PEMFC bipolar plates was formed using femtosecond laser processing technology. The selectedlaser process has a laser power of 10&#xa0;W, a repetition frequency of 125&#xa0;kHz, and a scanning speed of 800&#xa0;mm/s. The best effect is achieved when the laser performs unidirectional scanning. This process has achieved very good results in terms of the morphology of the three-dimensional surface, processing efficiency, surface roughness, surface wettability (increased hydrophilicity), water removal efficiency, and flow characteristics. The errors in the length, width, and depth of the entire channel were all controlled within 3%. Rapid laser processing can ensure a very high forming quality. After that, single-cell assembly and performance tests were carried out on the completed metal bipolar plate. The experimental polarization data of the traditional parallel flow field and the non-equidistant depth three-dimensional flow field were compared. The results confirmed that the non-equidistant depth three-dimensional flow field has better performance.</p>

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Process Research on Laser Ablation Fabrication of Non-equidistant Depth 3D Flow Fields for PEMFC Metal Bipolar Plates

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Chunqi Gao,
  • Mingge Wu,
  • Ao Chen,
  • Qiangqiang Gu,
  • Qianxi Sun,
  • Mengbin Gao,
  • Zhanqi Mao

摘要

In the parallel flow field of proton exchange membrane fuel cell(PEMFC), many existing process multi‑criteria parameter selection methods are currently limited to two-dimensional and uniform-depth designs. This approach aims to address the issues of uneven reactant distribution and the risk of flooding. However, with the advent of rapid laser processing technology, it has provided significant advantages for the formation of three-dimensional flow fields with non-equidistant depths. This technological breakthrough can bring several crucial benefits. For instance, it has a very high precision, does not require contact with the material during processing, and its flexibility is enhanced. At the same time, it significantly reduces the need for secondary processing. The three-dimensional flow field structure of 316 L stainless steel PEMFC bipolar plates was formed using femtosecond laser processing technology. The selectedlaser process has a laser power of 10 W, a repetition frequency of 125 kHz, and a scanning speed of 800 mm/s. The best effect is achieved when the laser performs unidirectional scanning. This process has achieved very good results in terms of the morphology of the three-dimensional surface, processing efficiency, surface roughness, surface wettability (increased hydrophilicity), water removal efficiency, and flow characteristics. The errors in the length, width, and depth of the entire channel were all controlled within 3%. Rapid laser processing can ensure a very high forming quality. After that, single-cell assembly and performance tests were carried out on the completed metal bipolar plate. The experimental polarization data of the traditional parallel flow field and the non-equidistant depth three-dimensional flow field were compared. The results confirmed that the non-equidistant depth three-dimensional flow field has better performance.