Based on our previous studies, the key factors that influence the power density are researched by three-dimension simulation, and the large scale vanadium flow battery system design and scaling technology are proposed. A three-dimension non-isothermal model of cell stack is presented. The temperature distributions in the electrode and the influence of porosity, flow-rate, and temperature change are clarified. The capacity decreasing could be forecasted accurately by capacity decreasing model. The design and integration method of vanadium flow battery system is presented. The large scale multi subsystem coupled design method is mastered based on the multi optimization method. The battery manage system (BMS) is proposed, including the monitor, alarm and protection. And then the vanadium flow battery system scaling technology is developed. The achievements are described as flowed. The single cell efficiency can reach to 81.8% at 200mA/cm2. The developed 22kW cell stack has no change of performance under the 550 charge and discharge cycles.The 352kW/700kW·h subsystem for large scale applications is developed. The DC efficiency is 73.8%,and AC efficiency is 68.2%,which reaches the international advanced level. The 22kW cell stack and 352kW/700kW·h subsystem are all passed the national energy achievements appraisal of science and technology.%在前期研究基础上，通过计算机三维模拟技术，对影响电堆功率密度的关键因素进行深入分析，并提出了大规模液流电池系统的设计方法及其规模放大技术。具体如下：通过建立液流电池三维非等温模型，揭示了电池内部的热源变化与温度分布特性，研究了孔隙率、流量对热源及温度变化的影响；通过容量衰减模型，准确预测容量的衰减程度；利用多目标优化的理论建立大规模电池多系统耦合设计的方法，提出了液流电池的监测、报警、保护体系，进而发展了液流电池规模放大理论体系。基于上述理论研究进行试制工作，开发的单电池能量效率达到81.8%（200 mA/cm2），开发的22 kW电堆经过550个循环，电池性能没有衰减，开发的352 kW/700 kW·h液流电池单元直流侧能量效率达到73.8%，交流侧系统效率达到68.2%。
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