An improved Coulomb Counting method based on dual open-circuit voltage and real-time evaluation of battery dischargeable capacity considering temperature and battery aging

Shun-Li Wang, Xin Xiong*, Chuan-Yun Zou, Lei Chen, Cong Jiang, Yan-Xin Xie, Daniel-Ioan Stroe

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Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

Coulomb Counting (CC) method plays an important role in the state of charge (SOC) estimation theory of lithium-ion batteries, and a lot of improvement and optimization strategies are based on it. With the increasing demand for precise management of lithium-ion battery systems, the performance of the traditional CC method is no longer suitable for more complex working conditions. First, the battery aging, extreme temperature, and high-rate discharging were considered as the main influencing factors which limit the SOC estimation accuracy of the CC method, and the performance degradation mechanism of the traditional CC method under the influence of the above factors are experimentally analyzed, especially the change of battery total dischargeable capacity after aging, and the change rules of key parameters in the CC equation are analyzed. Then the initial SOC and the total dischargeable capacity of the CC method are modified and estimated respectively to realize the accurate estimation of SOC under complex working conditions, especially the accurate SOC estimation during the whole life cycle of lithium-ion batteries. The experimental results show that the improved CC method can effectively deal with complex working conditions, and the comprehensive estimation accuracy of SOC is within 3.6%.

OriginalsprogEngelsk
TidsskriftInternational Journal of Energy Research
Vol/bind45
Udgave nummer12
Sider (fra-til)17609-17621
Antal sider13
ISSN0363-907X
DOI
StatusAccepteret/In press - 2021

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