State estimation method for power lithium-ion battery based on dynamic equilibrium voltage
by Qiuting Wang; Wei Qi
International Journal of Electric and Hybrid Vehicles (IJEHV), Vol. 10, No. 2, 2018

Abstract: The state parameters of power lithium-ion battery include the state of charge (SOC), the state of health (SOH) and the state of power (SOP). These three parameters are used to indicate the current remaining mileage, the maximum endurance mileage and the acceleration performance, respectively. The dynamic equilibrium voltage (DEV) based on battery electric characteristics is studied in this paper. The online state estimation problem of a battery cell under dynamic working conditions is discussed in depth. We chose the DEV value as the characteristic parameter to estimate the SOC and SOH value online. The main focus of our researches is the mathematical model of power lithium-ion battery is established based on the internal dynamic behaviour. Secondly, the state space equations are derived to describe the model parameters and the working performance. Thirdly, the SOC and SOH values are estimated accurately using only the DEV curve results under the battery's all-new state. Finally, our experiments were processed under different temperatures and different ageing degrees to investigate the new model and to validate our new estimation method.

Online publication date: Thu, 18-Oct-2018

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