阴极出口可变结构对空冷型质子交换膜燃料电池的性能影响OA北大核心

An air-cooled proton exchange membrane fuel cell(PEMFC)model with a variable cathode outlet structure was designed with separate cooling channels and a variable cathode outlet area,enabling effective regulation of the moisture balance inside the cell while enhancing the cooling effect.In order to highlight the characteristics of the outlet variable structure,single-cell models of the original structure and the outlet variable structure were calculated.At an output voltage of 0.6 V,the average temperature of the outlet variable structure model was 6℃lower than that of the original structure model,and the average water content of the outlet variable structule model increased by 0.78.At a load current density of 1.046 A/cm2,the power density of the outlet variable structure model was improved by 2.20%over the original structure model.Moreover,in the high-temperature and dry environment,the power density of the variable outlet structure model with a baffle height of 1.1 mm was 2.30%higher than that of the model with a baffle height of 0.3 mm.The results indicate that the variable outlet structure can improve the cell performance by enhancing the cooling performance and water retention performance of the cell,and it has better environmental adaptability in complex environments.