Abstract
In recent years, with the increasing use of lithium titanate batteries in various types of equipment, especially in rail transportation equipment, more and more attention has been paid to the safety of lithium titanate batteries. In order to address the cyclic overcharge failure that may occur in the practical application of lithium titanate batteries, this paper conducts cyclic overcharge experiments under different SOC to simulate the corresponding cyclic overcharge scenarios. Firstly, the analysis of the capacity variation shows that the decline rate is not linear and larger charging rate will reduce the power characteristics of lithium titanate battery more significantly. Secondly, the IC curve is used to analyze the pattern of decline caused by different levels of overcharge, and the experimental phenomenon shows that LAM type decline is dominated before the overcharge depth of 120% SOC, and LLI type decline starts to occur after reaching 130% SOC. Finally, comparing the characteristics of the IC curves of various fault types, it was found that the rightward shift of the IC curve around 2.6 V can be used as a marker to determine whether overcharging has occurred in lithium titanate batteries.
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**ng, T., Hu, R., Zheng, J., Gong, M., Zhou, X. (2023). Analysis of the Degradation Mechanism and Identification of Overcharging Method Under Different SOC Cyclic Overcharge of Lithium Titanate Batteries. In: Yang, Q., Dong, X., Ma, W. (eds) The proceedings of the 10th Frontier Academic Forum of Electrical Engineering (FAFEE2022). FAFEE 2022. Lecture Notes in Electrical Engineering, vol 1048. Springer, Singapore. https://doi.org/10.1007/978-981-99-3404-1_13
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DOI: https://doi.org/10.1007/978-981-99-3404-1_13
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