On the dynamic behavior of an aged Lithium-iron phosphate battery

被引:0
作者
Iannuzzi, Diego [1 ]
Fahimi, Babak [2 ]
Napolitano, Ciro [1 ]
机构
[1] Univ Naples Federico II, Elect Engn & Informat Technol Dept DIETI, Naples, Italy
[2] UT Dallas Texas, Elect Engn Renewable Energy & Vehicular Technol L, Dallas, TX USA
来源
2023 IEEE INTERNATIONAL CONFERENCE ON ELECTRICAL SYSTEMS FOR AIRCRAFT, RAILWAY, SHIP PROPULSION AND ROAD VEHICLES & INTERNATIONAL TRANSPORTATION ELECTRIFICATION CONFERENCE, ESARS-ITEC | 2023年
关键词
Dynamic modelling; SOH index; Testing; CYCLE-LIFE MODEL; CAPACITY FADE;
D O I
10.1109/ESARS-ITEC57127.2023.10114902
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
To date, the ageing of a lithium-ion battery is mainly detected by the reduction in capacity compared to the rated value and by the increase in internal impedance. These effects are considered in the electrical equivalent circuit through the representation of suitable empirical laws for the evaluation of the state of charge and that of the internal impedance. However, less attention has been paid to the analysis of alternate dynamic behavior of the battery voltage to a step variation in its current. This paper deals with the dynamic behavior of aged Lithium Phosphate-iron battery and introduces a novel dynamic ageing index. That is, to evaluate the dynamic voltage response following a discharge pulse at different states of charge and under different temperatures. A voltage undershoot was identified following a discharge step which highlights an inductive behavior at certain states of charge and temperatures. This phenomenon does not appear to be present for all states of charge and temperatures. This is likely stems from changes in internal resistance, polarization, and capacitance. The equivalent circuit has been modified by including a parasitic inductance in parallel with the polarization capacitance. The proposed model has been experimentally validated through a comprehensive set of tests in a climatic chamber.
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页数:5
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