热力发电2024，Vol.53Issue(12)：57-67,11.DOI:10.19666/j.rlfd.202405116
旁路电流对全钒液流电池库伦效率的影响
Effect of bypass current on coulombic efficiency of vanadium redox flow battery
摘要
Abstract
In order to improve the performance and efficiency of the battery in vanadium redox battery(VRB)system,a multi-stack equivalent loss circuit model is developed based on the composition and principles of VRBs,which includes electrochemical,hydrodynamic,temperature,bypass current,and vanadium batteries.Moreover,the effects of pumping loss and bypass current on vanadium batteries in the pipeline system of all-vanadium flow batteries are investigated.The relationship between pumping loss and pumping current,the bypass current model,and the equivalent circuit model of vanadium battery with multiple stacks connected in series are established,and the core mechanism of the vanadium battery taking into account the dynamic response is elaborated by transforming each model into a whole.The key factors involved in modelling of the VRB,including the pumping loss and bypass current,are discussed in detail.The influencing factors of battery performance and efficiency are also analyzed.The results show that,parameters such as the length and cross-sectional area of the pipeline affect the pipeline resistance,and the resistance of longer main and branch pipes will reduce the bypass current but increase the pumping loss current.Longer and thicker pipelines are conducive to the simultaneous reduction of both the bypass current and the pumping loss,which improves the energy efficiency of the battery.The research provides an idea for design of the manufacturer's pipeline.关键词
全钒液流电池/旁路电流/泵送损耗/多堆建模/能量效率Key words
vanadium redox battery/bypass current/pumping loss/multi-stack modeling/energy efficiency引用本文复制引用
侯谋,郑涛,贾泽峰,李俊伟,仇坤..旁路电流对全钒液流电池库伦效率的影响[J].热力发电,2024,53(12):57-67,11.基金项目
国家自然科学基金项目(62202138)National Natural Science Foundation of China(62202138) （62202138）
