Work

Combined State of Charge and State of Health estimation over lithium-ion battery cell cycle lifespan for electric vehicles

Year: 2014

Type: article

Abstract: A combined SOC (State Of Charge) and SOH (State Of Health) estimation method over the lifespan of a lithium-ion battery is proposed. First, the SOC dependency of the nominal parameters of a first-order RC (resistor-capacitor) model is determined, and the performance degradation of the nominal model over the battery lifetime is quantified. Second, two Extended Kalman Filters with different time scales are used for combined SOC/SOH monitoring: the SOC is estimated in real-time, and the SOH (the capacity and internal ohmic resistance) is updated offline. The time scale of the SOH estimator is determined based on model accuracy deterioration. The SOC and SOH estimation results are demonstrated by using large amounts of testing data over the battery lifetime.

Source: Journal of Power Sources

DOI: 10.1016/j.jpowsour.2014.09.146

Authors: Yuan Zou, Xiaosong Hu, Hongmin Ma, Shengbo Eben Li

Institutions: Beijing Institute of Technology, University of California, Berkeley, Tsinghua University

Language: English

Topic: Battery Modeling and Management

Subfield: Automotive Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $4,230