ESCL_에너지저장변환 실험실

Energy Storage Conversion Lab.

Publication

International

Influence of different open circuit voltage tests on state of charge online estimation for lithium-ion batteries
Content type 2016
Title of paper Influence of different open circuit voltage tests on state of charge online estimation for lithium-ion batteries
Author Fangdan Zheng, Yinjiao Xing, Jiuchun Jiang, Bingxiang Sun, Jonghoon Kim, Michael Pecht
Publications Applied Energy
Status of publication published
Vol 183
Link 관련링크 https://www.sciencedirect.com/science/article/pii/S0306261916313125 51회 연결

Battery state of charge (SOC) estimation is a crucial function of battery management systems (BMSs),

since accurate estimated SOC is critical to ensure the safety and reliability of electric vehicles. A widely

used technique for SOC estimation is based on online inference of battery open circuit voltage (OCV).

Low-current OCV and incremental OCV tests are two common methods to observe the OCV-SOC relationship,

which is an important element of the SOC estimation technique. In this paper, two OCV tests are run

at three different temperatures and based on which, two SOC estimators are compared and evaluated in

terms of tracking accuracy, convergence time, and robustness for online estimating battery SOC. The temperature

dependency of the OCV-SOC relationship is investigated and its influence on SOC estimation

results is discussed. In addition, four dynamic tests are presented, one for estimator parameter identification

and the other three for estimator performance evaluation. The comparison results show that estimator

2 (based on the incremental OCV test) has higher tracking accuracy and is more robust against

varied loading conditions and different initial values of SOC than estimator 1 (based on the lowcurrent

OCV test) with regard to ambient temperature. Therefore, the incremental OCV test is recommended

for predetermining the OCV-SOCs for battery SOC online estimation in BMSs.