An accurate parameters extraction method for a novel on-board battery model considering electrochemical properties. (August 2019)

• Record Type: Journal Article
• Authors: Zheng, Yuejiu; Gao, Wenkai; Han, Xuebing; Ouyang, Minggao; Lu, Languang; Guo, Dongxu
• Is Part Of: Journal of energy storage. Volume 24(2019)
• Publication Date: 2019-08
• Subjects: Electric vehicle -- Lithium-ion battery -- Battery model -- State of charge -- Model parameters; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2019.04.019
• Languages: English
• ISSNs: 2352-152X

Abstract

Highlights: An electrochemistry-based equivalent circuit model (E-ECM) is proposed. A decoupling parameters extraction (DPE) method for the proposed E-ECM is investigated. Only one group of parameters for E-ECM can simulate battery various voltage response at various discharge rate. Experiment demonstrates that the E-ECM is able to predict battery rate capability. Abstract: Accurate battery models are essential for the assessment of battery states and performance. Traditional equivalent circuit model (ECM), e.g. second-order RC model, cannot imitate non-linear characters of Lithium-ion battery especially in low state of charge (SOC) area. Considering the advantages of battery electrochemical and ECM, the paper proposes an electrochemistry-based equivalent circuit model (E-ECM). With only two parameters more than second-order RC model, E-ECM can simulate battery voltage response better. Next, different from the previous model parameters optimization method, a decoupling parameters extraction (DPE) method is studied to derive the more appropriate model parameters for the proposed E-ECM first. The DPE method is believed to relate to battery electrochemical characters. Experiment results show that the obtained E-ECM is of a good performance no matter in the dynamic working conditions, or constant current working condition, especially in low SOC area. Moreover, the proposed E-ECM is able to describe battery rate capability with high accuracy.