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Analysis of CT-CV Charging Technique for Lithium-ion and NCM 18650 Cells Over Temperature Range

This paper presents a constant temperature and constant voltage (CT-CV) based charging technique applied to a Nickel Manganese Cobalt (NMC) 18650 and lithium-ion cells. Analysis and behavior of the cell at different ambient temperature have been investigated in this paper. Moreover, the experimental procedure details, including the implemented CT-CV algorithm for analyzing the charging of batteries are detailed. The proposed CT-CV charging is compared with existing constant current and constant current (CC-CV) under different ambient temperatures and charging current rates. Finally, experimental validations are performed on NCM batteries and the results are presented.