在质子交换膜燃料电池（PEMFC）装配过程中,装配力会导致气体扩散层（GDL）出现压缩变形。为确定最佳装配力以提高燃料电池性能,通过试验和数值模拟方法,对PEMFC在不同装配力下GDL变形、电流密度分布和氧浓度分布进行分析。并通过综合考虑压降、功率密度和电流密度分布等多参数对PEMFC性能进行综合评价。研究结果表明：装配力导致GDL在肋下发生非线性应力-应变压缩,其中在2.0 MPa装配力下,压缩率达到61%。在0.95 A/cm2电流密度时,1.0 MPa下PEMFC的功率密度相比0.5 MPa提高装配力4.57%。而且根据熵权法评价发现1.0 MPa装配力下PEMFC综合性能最佳。
Abstract
The compression deformation of the GDL is caused by assembly force. To determine the optimal assembly force for improving fuel cell performance, the GDL deformation, current density distribution, and oxygen concentration distribution of the PEMFC under different assembly forces were analyzed based on experimental and numerical simulation methods. The PEMFC performance was comprehensively evaluated by considering multiple parameters such as pressure drop, power density, and current density distribution. The results show that the assembly force resulted in nonlinear stress-strain compression of the GDL under the rib, with compression reaching 61 % at the assembly force of 2.0 MPa. The power density of PEMFC at 1.0 MPa increased by 4.57 % compared to the results of 0.5 MPa under 0.95 A cm-2. Moreover, the overall performance of PEMFC at 1.0 MPa was the best by using the entropy weighting method.
关键词
质子交换膜燃料电池 /
装配 /
接触电阻 /
压缩变形 /
最佳装配力 /
综合评价
Key words
proton exchange membrane fuel cells /
assembly /
contact resistance /
compressive deformation /
optimal assembly force /
synthesized assessment
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基金
国家自然科学基金（52305257）; 天津市科技计划（22JCQNJC00110）; 河北省自然科学基金（E2023202168）
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