首页|各向异性膨胀石墨双极板对燃料电池性能的影响

各向异性膨胀石墨双极板对燃料电池性能的影响

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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(kz)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kz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 mV;沿流道气体流动方向的热导率(ky)是影响散热能力的关键因素,将ky与kz提高至280 W·m-1·K-1,或者实现各向同性结构(kx=ky=kz=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ky与kz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.
Influence of anisotropic conductive expanded graphite bipolar plates on performance of proton exchange membrane fuel cell
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 kz from the 5 W·m-1·K-1 for a traditional structure to the 280 W·m-1·K-1,enhances the voltage by 22 mV under 2.2 A cm-2.The conductivity along gas-flow direction ky plays an important role in heat dissipation.Increasing ky and kz to 280 W·m-1·K-1,or accomplishing isotropic conductivity(kx=ky=kz=20 W·m-1·K-1),reduces the Membrane-Electrode-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.

proton exchange membrane fuel cell(PEMFC)expanded graphite bipolar plates(EGBPs)anisotropic conductivitythermal and water managementheat dissipation

丁玉杰、甘全全、邵扬斌、徐梁飞、李建秋、欧阳明高

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广州大学 土木工程学院,广州 510006,中国

清华大学车辆与运载学院,智能绿色车辆与交通全国重点实验室(原汽车安全与节能国家重点实验室),北京 100084,中国

上海神力科技有限公司,上海 201401,中国

质子交换膜燃料电池(PEMFC) 膨胀石墨双极板(EGBPs) 各向异性导热 水热管理 散热能力

国家自然科学基金资助项目清华大学汽车安全与节能国家重点实验室开放基金课题

52102426KFY2216

2024

10.3969/j.issn.1674-8484.2024.04.009

汽车安全与节能学报
清华大学

汽车安全与节能学报

CSTPCD北大核心
影响因子：0.748
ISSN：1676-8484
年,卷(期)：2024.15(4)