Study on Battery Pack Consistency Evolutions during Electric Vehicle Operation with Statistical Method

• DOI: 10.1016/j.egypro.2017.03.816
• Publication Date: 2017-06-02T04:36:57Z
• Authors: Caiping Zhang; Gong Cheng; Qun Ju; Weige Zhang; Jiuchun Jiang; Linjing Zhang
• Keywords: Battery pack; Internal resistance; Open-circuit voltage; State of charge

The consistency among lithium-ion battery pack is an important factor affecting their performance. In order to investigate the evolutions and influencing factors from statistics point of view, long-term data two trolley buses are collected. Two parameters including internal resistance open-circuit voltage (OCV) chosen describe in study. mathematical relationship between OCV standard deviation after a period time intimal with polynomial model established. It proved that error within 6%. demonstrated temperature has greatest impact on through correlation analysis. initial SOC inconsistency key based operation data, providing foundation for improvement.