电力科技与环保2025，Vol.41Issue(2)：252-262,11.DOI:10.19944/j.eptep.1674-8069.2025.02.008
光纤布拉格光栅原位监测揭示硬壳电池应变、温度演变机理研究
FBG-based study of in-situ strain and temperature evolution in prismatic cell
摘要
Abstract
[Objective]Prismatic cells generate strains and heat during charging and discharging due to changes of the electrodes'lattice structure and electro-chemical reactions,and such strains and heat have an important impact on key indicators such as the state of charge,safety performance,and service life of the cells.[Methods]In order to monitor and analyze strain and temperature change more accurately,fiber bragg grating(FBG)technology is used to conduct an in-depth study on prismatic cells composed of lithium iron phosphate(LFP)and graphite,including the optimalapplication of FBG,the monitoring of single-electrode strain changes and correlation analysis with the changes in the crystalline structure of the electrode material,and the application of FBG to monitor the temperature change of the cellmodule in the energy storage power station.[Results]The results show that using fiber optic strain gauges on the side of the cell or indirectly monitoring the strain of the front of the cell through a fixture can stably capture the strain change of the cell during cycling,and the strain during the cycling process is about 500 με on the front,and 50 με on the side.The change of the crystal lattice volume caused by lithium ions insertion and extraction is the fundamental cause of the change of the cell strain.The cell side area has the most serious heat accumulation compared(3℃higher).The performance of the FBG in temperature measurement accuracy is comparable to that of thermocouples but the multiplexing is better,which realizes the use of one optical fiber etched with two FBGs to monitor the temperature changes of two batteries.[Conclusion]Therefore,the FBG technology reveals the mechanism of strain and temperature evolution in the cycling process of prismatic cells,and has a broad application prospect in the field of battery monitoring.关键词
光纤传感器/电化学-力学行为/锂离子电池/光纤布拉格光栅/原位应变监测Key words
optical fiber sensors/electrochemical-mechanical behavior/lithium-ion batteries/fiber Bragg gratings/in-situ strain monitoring分类
能源与动力引用本文复制引用
黄丹茹,葛筱渔,张怡,裴非,黄桥生,王建豪,牟申周,徐星..光纤布拉格光栅原位监测揭示硬壳电池应变、温度演变机理研究[J].电力科技与环保,2025,41(2):252-262,11.基金项目
国家自然科学基金项目(21801213) （21801213）
