China Energy Science and Technology Research Institute Co., Ltd.;School of materials science and engineering, Huazhong University of Science and Technology;
[Objective] Prismatic cells generate strains and heat during charging and discharging due to changes of theelectrodes' lattice structure and electro-chemical reactions, and such strains and heat have an important impact on keyindicators such as the state of charge, safety performance, and service life of the cells. [Methods] In order to monitorand analyze strain and temperature change more accurately, fiber bragg grating(FBG) technology is used to conduct anin-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 thecrystalline 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 sideof the cell or indirectly monitoring the strain of the front of the cell through a fixture can stably capture the strain changeof 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 thechange of the cell strain. The cell side area has the most serious heat accumulation compared(3 ℃ higher). Theperformance of the FBG in temperature measurement accuracy is comparable to that of thermocouples but themultiplexing is better, which realizes the use of one optical fiber etched with two FBGs to monitor the temperaturechanges of two batteries. [Conclusion] Therefore, the FBG technology reveals the mechanism of strain andtemperature evolution in the cycling process of prismatic cells, and has a broad application prospect in the field ofbattery monitoring.
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Basic Information:
DOI：10.19944/j.eptep.1674-8069.2025.02.008
China Classification Code:TM91;TP212
Citation Information:
[1]黄丹茹,葛筱渔,张怡等.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(02):252-262.DOI:10.19944/j.eptep.1674-8069.2025.02.008.
Fund Information:
国家自然科学基金项目(21801213)