【摘要】 该文分析了膨胀石墨双极板（EGBPs）各向异性结构对燃料电池水热管理与输出性能的影响。建立了三维两相非等温数值模型，对比了4种典型复合材料结构下温度、电流密度、水含量等参数的分布特征，揭示了双极板传热特性与输出性能的耦合效应。结果表明：沿质子传递方向热导率（k_z）对燃料电池性能具有显著影响，在2.2 A cm^-2电流密度下，将k_z从常规结构的5 W·m^-1·K^-1提升至280 W·m^-1·K^-1，可以使输出性能提高22 m V；沿流道气体流动方向的热导率（k_y）是影响散热能力的关键因素，将k_y与k_z提高至280 W·m^-1·K^-1，或者实现各向同性结构(k_x=k_y=k_z=20 W·m^-1·K^-1)，均能够使膜电极组件（MEA）核心区域的温度降低2℃左右。因此，提高k_y与k_z并实现各向同性结构是膨胀石墨双极板技术的未来发展目标之一。更多还原

【Abstract】 Established a three-dimensional,two-phase,non-isothermal fuel cell single channel model to investigate the influence of anisotropic structure of Expanded Graphite Bipolar Plates （EGBPs） on thermal management and the performances of proton exchange membrane fuel cell （PEMFC）.The distribution of temperature,the current density and the membrane water content under four main material orientations were compared.The coupling effect between EGBPs heat transfer characteristics and the outperformance were revealed.The results show that increasing the conductivity along proton-transport direction k_z from the5 W·m^-1·K^-1 for a traditional structure to the 280 W·m^-1·K^-1,enhances the voltage by 22 m V under 2.2 A cm^-2.The conductivity along gas-flow direction k_y plays an important role in heat dissipation.Increasing k_y and k_z to 280 W·m^-1·K^-1,or accomplishing isotropic conductivity (k_x=k_y=k_z=20 W·m^-1·K^-1),reduces the MembraneElectrode-Assembly （MEA） core-area peak-temperature by 2℃.Therefore,enhancing the gas-flow and proton-transport direction conductivities and accomplishing isotropic structure are one of the future main development goal of expanded graphite bipolar plates.更多还原