液态金属电池的温度特性  

Temperature Characteristics of Liquid Metal Batteries

作　　者：林靖 王晟 李浩秒 王康丽 蒋凯 LIN Jing;WANG Sheng;LI Haomiao;WANG Kangli;JIANG Kai(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China)

机构地区：[1]电气与电子工程学院强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2021年第4期1458-1468,共11页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2018YFB0905600);国家自然科学基金项目(U1766216,51774148,51861135315)。

摘　　要：作为一类高温电池,液态金属电池的工作温度在300℃~700℃之间,工作温度对于电池性能具有重要影响。该文探究了工作温度对液态金属电池开路电压、充放电性能和电池内阻的影响。首先,建立双极化等效电路模型;运用静置法得到不同工作温度下的开路电压,并通过吉布斯—亥姆霍兹方程和能斯特方程计算相关电化学—热力学参数;运用电池循环测试得到不同工作温度下的循环性能指标;利用脉冲测试数据辨识不同工作温度下的内阻参数,从电池反应界面演变、电极反应、传质过程等方面分析工作温度和荷电状态对内阻的影响;仿真结果表明,考虑温度特性的双极化模型的相对电压误差在±0.03V以内,能较好地反映液态金属电池的动态特性。As a kind of high-temperature batteries, the operating temperature of liquid metal batteries(LMBs) is between 300℃~700℃, which has an important influence on battery performances. This paper explored the effect of operating temperature on the open circuit voltage(OCV), charge and discharge performances and the internal resistance of LMBs. Firstly, a dual polarization equivalent circuit model was built. The OCVs at different operating temperatures were obtained by the resting method, and the relevant electrochemical-thermodynamic parameters were calculated by the Gibbs-Helmholtz equation and the Nernst equation. The cycle performances at different operating temperatures were investigated through battery cycle tests. The pulse test data were used to identify the internal resistance at different operating temperatures, and the effect of operating temperature and state-of-charge(SoC) on the internal resistance was analyzed from the aspects of reaction interface evolution, electrode reaction and mass transfer process. The simulation results show that the improved dual polarization model error is within ±0.03 V, indicating that the model could accurately reflect the dynamic characteristics of LMBs.

关 键 词：液态金属电池 双极化模型 充放电性能 开路电压 内阻特性 

分 类 号：TM91[电气工程—电力电子与电力传动]