access icon free State of charge estimation of a lithium-ion battery using robust non-linear observer approach

© The Institution of Engineering and Technology
Received 02/01/2018, Accepted 30/04/2018, Revised 23/04/2018, Published 08/05/2018

A robust non-linear observer is proposed to estimate the state of charge (SoC) of a lithium-ion battery by employing an electrical model of the battery. Considering the non-linear behaviour of the open circuit voltage versus SoC curve, a non-linear state space model is established. The modelling errors and uncertainties are compensated by the proposed non-linear observer resulting in robustness in the presence of these errors, which is the main feature of the proposed observer. The stability of the observer is proved by the Lyapunov criteria. The effectiveness of the proposed observer is verified by using the experimental test. The test results show that the proposed approach is effective and estimates the SoC with high accuracy. Additional experimental test verifies the robust performance of the proposed observer in the presence of the modelling errors and disturbances.

Inspec keywords: state-space methods; stability; lithium compounds; Lyapunov methods; secondary cells; observers

Other keywords: Lyapunov criteria; nonlinear state space model; experimental test; Li; state of charge estimation; robust nonlinear observer approach; electrical model; modelling errors; lithium-ion battery; open circuit voltage; SoC curve

Subjects: Secondary cells; Secondary cells

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