组装压力对质子交换膜燃料电池性能的影响,Energy Storage and Saving

组装力是质子交换膜燃料电池 (PEMFC) 堆叠过程中的关键因素，对流体流动、传质以及水和热管理有显着影响，从而影响燃料电池的性能。在这项研究中，从最容易变形的部件气体扩散层（GDL）出发，结合有限元分析和计算流体动力学方法，分析了组装力对单通道PEMFC的影响。从微观分析中获得的非线性应力-应变曲线被创造性地引入到二维压缩模型中。三维模型中的气体扩散系数也是从微观模拟中获得的。压缩 GDL 的模拟有效氧扩散系数约为 Bruggemann 估计值的 0.86 倍。-2与 0.5 MPa 时相比。考虑接触电阻后，组装压力对电池性能（V-I曲线）的影响有质的不同。在 1.7 A cm -2时，2.5 MPa 情况下的压降比 1.4 MPa 情况下的压降高 20% 。O 2难以流入孔隙率和渗透率较低的肋下区域。结果表明，当组装力增加时，液态水和膜水含量都会增加。还分析了装配力对温度的影响。

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The assembly force is a crucial factor in the process of proton exchange membrane fuel cell (PEMFC) stacking, and has significant effects on the fluid flow, mass transfer, and water and thermal management, which affect the fuel cell performance. In this study, from the most deformable component, the gas diffusion layer (GDL), combining with a finite-element analysis, and computational fluid dynamic method, the impact of the assembly force on a single-channel PEMFC is analyzed. A nonlinear stress–strain curve obtained from a microanalysis is creatively introduced into the two-dimensional compression model. The gas diffusion coefficient in the three-dimensional model is also obtained from the microscopic simulation. The simulated effective oxygen diffusion coefficient of the compressed GDL is approximately 0.86 times the Bruggemann estimated value. When the contact resistance is ignored, the output voltage at 2.5 MPa is decreased by approximately 15.4% at 1.7 A·cm−2 compared with that at 0.5 MPa. After the contact resistance is considered, the effects of the assembly pressure on the cell performance (V–I curve) are qualitatively different. The pressure drop of the 2.5-MPa case is 20% higher than that of the 1.4 MPa case at 1.7 A cm−2. O2 is hard to flow into the region under the rib where the porosity and permeability are lower. The results indicate that both liquid water and membrane water contents increase when the assembly force increases. The effect of the assembly force on the temperature is also analyzed.