Volume 27: Closing Carbon Cycles – A Transformation Process Involving Technology, Economy, and Society: Part II

State-of-Charge Estimation of Series-parallel Battery Packs Based on Fusion Models for Electric Vehicles Aihua Tang, Yukun Huang, Jianming Li, Quanqing Yu

Abstract

Estimating the state-of-charge of battery packs is more important than that of single cells in electric vehicles. This paper proposes a battery pack model to estimate the SOC of a series-parallel battery pack for electric vehicles, which integrates the difference model and the mean model. To verify the performance of the model, we use the model to estimate the SOC of a 12-series-3-parallel (12S3P) battery pack under dynamic conditions, the results show that the maximum error of the battery pack SOC estimation is 0.005.

Keywords series-parallel battery pack, state-of-charge, difference model, mean model