Experimental Characterization of Lithium-Ion Cell Strain Using Laser Sensors

Energies

卷:14

Francesco Mocera¹  Aurelio Som๠ Davide Clerici¹ 

[1] Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Corso duca degli Abruzzi 24, 10129 Torino, Italy;

关键词: battery swelling;    experimental mechanics;    thickness change modelling;    strain;    state of charge;   

DOI  :  10.3390/en14196281

来源: DOAJ

【 摘 要 】

The characterization of thickness change during operation of LFP/Graphite prismatic batteries is presented in this work. In this regard, current rate dependence, hysteresis behaviour between charge and discharge and correlation with phase changes are deepened. Experimental tests are carried out with a battery testing equipment correlated with optical laser sensors to evaluate swelling. Furthermore, thickness change is computed analytically with a mathematical model based on lattice parameters of the crystal structures of active materials. The results of the model are validated with experimental data. Thickness change is able to capture variations of the internal structure of the battery, referred to as phase change, characteristic of a certain state of charge. Furthermore, phase change shift is a characteristic of battery ageing. Being able to capture these properties with sensors mounted on the external surface the cell is a key feature for improving state of charge and state of health estimation in battery management system.

【 授权许可】

Unknown