Vehicular level battery modeling and its application to battery electric vehicle simulation

• Published in: Journal of power sources 2023-02, Vol.556, p.232531, Article 232531
• Main Authors: Shin, Jinyong, Kim, Wooil, Yoo, Kisoo, Kim, Hyunjun, Han, Manbae
• Format: Article
• Language: English
• Subjects: Battery electric vehicle simulation; Battery modeling; Battery parameter estimation; Cell-to-pack battery model; Lithium ion battery; Pack-to-cell battery model
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2022.232531

Battery modeling is a prerequisite for the successful development of the battery electric vehicle. Many researches on the battery modeling methods have been developed on the cell level and showed their good performance. The extension of the battery model to the vehicle level has drawn attention recently. This paper presents at the vehicular level lithium ion battery modeling method, i.e. pack and cell models with 1RC equivalent circuit model, by applying the vehicle chassis dynamometer test. These pack and cell models are cross compared at the same voltage level via scale transformation. Among two model parameters, the battery static parameter open circuit voltage (OCV) is measured by chassis dynamometer test to determine OCV value according to specific state of charge. The battery dynamic parameters R0, R1, and C1 are extracted by nonlinear least square method. The two battery models are validated by experimental testing. The comparison showed that all battery models have similarly high levels of accuracy within the vehicle operation region. These battery models are adopted into the battery electric vehicle (BEV) model, which shows the validity to evaluate various key component parameters of BEV such as motor, battery capacity, battery structure, and driving mode. •Vehicular level battery model is presented by applying the vehicle test data.•Two battery models at the vehicular level are compared at same voltage level.•BEV simulation demonstrates successfully vehicular level battery models.