整体化全钒氧化还原液流电池电堆的开发  

Development of integrated all-vanadium redox-flow battery stack

作　　者：张建 张晔 徐熙林 李青春 李爱魁 ZHANG Jian;ZHANG Ye;XU Xilin;LI Qingchun;LI Aikui(Laoning Power Exchange Center Co.,Ltd.,Shenyang,Liaoning 110006,China;School of Electrical Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)

机构地区：[1]辽宁电力交易中心有限公司,辽宁沈阳110006 [2]大连理工大学电气工程学院,辽宁大连116024

出　　处：《电池》2024年第2期200-204,共5页Battery Bimonthly

基　　金：国网辽宁省电力有限公司科技项目(SGTYHT/21-WT-225)。

摘　　要：为提高全钒液流电池电堆充放电电流密度,开发大功率电堆,通过热熔焊、激光焊接等方式,将双极板、电极和液流框焊接为整体,组装成整体化液流电池电堆。与传统电堆相比,整体化液流电池电堆欧姆内阻由20.2 mΩ降为12.1 mΩ,这主要是由于整体化液流电池电堆采用焊接方式,降低了电极与双极板的接触内阻。在125 mA/cm^(2)电流密度下,整体化液流电池电堆的电压效率为82.8%,比传统电堆电压效率高2.5个百分点;当电流密度为200 mA/cm^(2)时,整体化液流电池电堆的能量效率仍大于75%。当电解液流速超过0.95 m^(3)/h时,电堆能量效率基本不再变化,但放电容量即电解液利用率会进一步提高;当放电截止电压由10.0 V优化为10.5 V时,在200 mA/cm^(2)的电流密度下,整体化电堆的电压效率由78.4%提高到80.0%,电解液利用率基本无变化。In order to improve the charge and discharge current density of all-vanadium redox flow battery stacks and develop a high-power stack,the bipolar plate,electrode and flow frame are welded into a whole by means of hot melt welding and laser welding to assemble an integrated redox flow battery stack.Compared with the traditional stack,the Ohmic internal resistance of the integrated flow battery stack is reduced from 20.2 mΩto 12.1 mΩ.This is mainly due to the welding method of the integrated flow battery stack,which reduces the contact internal resistance between the electrode and the bipolar plate.The voltage efficiency of the integrated flow battery stack is 82.8%at a current density of 125 mA/cm^(2),which is 2.5 percentage points higher than that of the traditional stack.When the current density is 200 mA/cm^(2),the energy efficiency of the integrated flow battery stack is still greater than 75%.When the electrolyte flow rate exceeds 0.95 m^(3)/h,the energy efficiency of the stack basically does not change,but the discharge capacity,that is,the electrolyte utilization rate,will be further improved.When the discharge cut-off voltage is optimized from 10.0 V to 10.5 V,the voltage efficiency of the integrated stack is increased from 78.4%to 80.0%at a current density of 200 mA/cm^(2),the electrolyte utilization rate is basically unchanged.

关 键 词：整体化电堆 充放电 电压效率 放电容量 液流电池 

分 类 号：TM912[电气工程—电力电子与电力传动]