碘锌液流电池建模与流道优化研究

Flow Channel Optimization of Iodine-Zinc Liquid Flow Battery Modeling

为了改善碘锌液流电池的整体效率和双极板流道电解液分布均匀性,通过把流体力学模型、电化学模型和等效电路模型耦合成混合模型,得到充放电期间泵损耗电流变化关系,考虑调整进出口方向、增加倾斜挡板和通道数量对双极板流场进行分析。数值模拟结果显示,双挡板异侧多通道蛇形管道与传统流道相比,既能改善流体分布的均匀性,提高碘锌液流电池效率,又能有效降低流阻,减少泵消耗的能量。

In order to improve the overall efficiency of the iodine-zinc flow battery and the uniformity of the electrolyte distribution in the bipolar plate flow channel,the current variation relationship of pump loss during charging and discharging are obtained by coupling the fluid mechanics model,the electrochemical model and the equivalent circuit model into a hybrid model.The flow field of bipolar plate is analyzed by considering the inlet and outlet direction angle,setting inclined baffle and the number of channels.The numerical simulation and experimental results show that,compared with the traditional flow channel,the double baffle multi-channel serpentine pipeline can not only improve the uniformity of fluid distribution and the efficiency of the iodine-zinc flow battery,but also effectively reduce the flow resistance and the pump consumption.