Abstract
Power batteries are always misused and abused due to the fault or failure of battery management system (BMS), resulting the overcharge and over-discharge. In this study, NCM lithium-ion battery is used as the research object. Cyclic experiments of different overcharge degrees under voltage and capacity as cut-off conditions are performed, respectively. The evolution of the basic performance parameters under different conditions are observed. As the overcharge deepens, it will lead to accelerated degradation of capacity and deterioration of kinetic performance. In addition, overcharge with capacity has worse performance and is accompanied by a sharp rise in battery cut-off voltage. In-situ analysis method is used to describe the battery fading mechanism. The phase change reaction at 4.4V consumes the cathode material used for the normal charging process. The side reactions after charging to 4.7V generate a large amount of heat. Inventory lithium ions are lost and the electrode reaction uniformity is deteriorated as the cycle process. Ultimately, the battery has different tolerances under different overcharge strategies. Overcharge with capacity has faster decay rate, while overcharge with voltage has worse security
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: DEStech Transactions on Environment, Energy and Earth Sciences
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.