电网储能用磷酸铁锂电池弛豫现象研究  

Research on relaxation phenomenon of lithium iron phosphate batteries for energy storage in power grid

作　　者：李一凡 王铭民 郭鹏宇 何永君[1] LI Yifan;WANG Mingmin;GUO Pengyu;HE Yongjun(Chinese Society for Electrical Engineering,Beijing 100761,China;State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing Jiangsu 210024,China)

机构地区：[1]中国电机工程学会,北京100761 [2]国网江苏省电力有限公司,江苏南京210024

出　　处：《电源技术》2024年第9期1764-1768,共5页Chinese Journal of Power Sources

基　　金：中国电机工程学会咨询项目(CSEE-ZXXM-2022-0016)。

摘　　要：磷酸铁锂储能电池长时间处于调峰调频复杂工况下会引起电池电极活性降低和寿命衰减现象。开展了调峰调频工况下磷酸铁锂储能电池模组的充放电实验,对其弛豫行为进行分析,对比不同荷电状态(SOC)、不同充放电方式、不同充放电倍率下弛豫电压的变化,提出电压偏移率作为度量电压恢复能力的指标。实验结果表明:调频模式的电压恢复时间大于调峰模式,电流倍率越大,弛豫时间越长;调峰模式下每次充放电循环后间歇静置540~660 s,调频模式下每次循环后静置900~1100 s,有利于电压的恢复。Long term peak shaving and frequency modulation of lithium iron phosphate energy storage batteries can lead to a decrease in electrode activity and a decrease in battery life.By conducting charging and discharging experiments on lithium iron phosphate energy storage battery modules under peak shaving and frequency modulation conditions,the relaxation behavior was analyzed,and the changes in relaxation voltage under different SOC,different charging and discharging methods,and different charging and discharging rates were compared.The voltage offset rate was proposed as an indicator to measure the voltage's recovery ability.The analysis of experimental results shows that the voltage recovery time of frequency modulation mode is greater than that of peak modulation mode,and the larger the current magnification,the longer the relaxation time.In peak shaving mode,after each charging and discharging cycle,intermittently soak for 540~660 s,while in frequency modulation mode,soak for 900~1100 s after each cycle,which is beneficial for voltage's recovery.

关 键 词：磷酸铁锂储能电池 调峰调频 弛豫行为 静置时间 

分 类 号：TM912[电气工程—电力电子与电力传动]