VRFB用流场板结构的优化设计及其应用研究  

Research on optimization design and application of flow field plate structure for VRFB

作　　者：王钺淞 李松 李强 白桉裕 孙红 WANG Yue-song;LI Song;LI Qiang;BAI An-yu;SUN Hong(School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang Liaoning 110168,China)

机构地区：[1]沈阳建筑大学机械工程学院,辽宁沈阳110168

出　　处：《电源技术》2020年第8期1156-1160,共5页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51776131,51902211)。

摘　　要：全钒氧化还原液流电池(VRFB)内部的电解液流场结构的合理设计有利于提高VRFB电解液分布的均匀性,降低电池极化,从而提高电池性能。针对目前VRFB存在的低放电功率和电池效率不高的问题,设计了树形、渔网形和梯形3种新型VRFB流场板,通过研究不同流场板结构对VRFB功率、充放电性能、电池效率、电池阻抗及电池循环稳定性的影响,确定最优流场板结构以提升电池性能。研究结果表明,树形流场板、渔网形流场板和梯形流场板均能有效提升VRFB的电池性能。安装梯形流场板的VRFB具有最佳的电池性能,其电流效率提高至96.56%,电压效率提高至80.61%,能量效率提高至77.91%,放电容量相比于装配传统流场板的电池提高了34.56%,最高输出功率密度高达0.356 W/cm^2。The rational design of the electrolyte flow field structure inside the all-vanadium redox flow battery(VRFB)is beneficial to improve the uniformity of the VRFB electrolyte distribution and reduce the battery polarization,thereby improving the battery performance.In view of the low discharge power and low battery efficiency of VRFB,three new VRFB flow field plates including tree shape,fishnet shape and trapezoid shape were designed.The effects of different flow field plate structures on the power,charge and discharge performance,efficiency,impedance,and cycle stability of VRFB were studied to determine the optimal flow field plate structure so as to improve the battery performance.The results show that all three flow field plates can effectively improve the VRFB performance.The VRFB with trapezoidal flow field plate has the best battery performance,the current efficiency increases to 96.56%,the voltage efficiency increases to 80.61%,the energy efficiency increases to 77.91%,its discharge capacity improves by 34.56%compared with the battery equipped with the conventional flow field plate,and the highest output power density is as high as 0.356 W/cm2.

关 键 词：VRFB 流场结构 电池性能 优化设计 

分 类 号：TM911[电气工程—电力电子与电力传动]