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Real-time estimation of model parameters and state-of-charge of lithiumion batteries in electric vehicles using recursive least-square with forgetting factor

Conference Paper


Abstract


  • A precise estimation of the lithium-ion battery's inner state, such as the state of health (SoH) and the state of charge (SoC) of the battery, is crucial for a reliable and effective performance of a battery management system in an electric vehicle. In this paper, an improved real-time model-based battery parameters estimation method using the recursive least-square algorithm with forgetting factor (RLS-FF) is proposed. Compared to the traditional methods, the proposed model yields the capability to accurately estimate the battery SoC and SoH by including the real-time variation of open circuit voltage and internal resistance of a battery, respectively. Moreover, a forgetting factor is used to capture the online parameter variations by reducing the impact of the older data to keep the model simple and suitable for EV applications. To verify the validity of the proposed model, an experimental test is carried out on a 2012 Nissan Leaf 31.1 Ah Manganese-oxide Li-ion battery cell.

Publication Date


  • 2018

Citation


  • K. Sarrafan, K. Muttaqi & D. Sutanto, "Real-time estimation of model parameters and state-of-charge of lithiumion batteries in electric vehicles using recursive least-square with forgetting factor," in Proceedings of 2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2018, pp. 1-6.

Scopus Eid


  • 2-s2.0-85065960298

Start Page


  • 1

End Page


  • 6

Place Of Publication


  • United States

Abstract


  • A precise estimation of the lithium-ion battery's inner state, such as the state of health (SoH) and the state of charge (SoC) of the battery, is crucial for a reliable and effective performance of a battery management system in an electric vehicle. In this paper, an improved real-time model-based battery parameters estimation method using the recursive least-square algorithm with forgetting factor (RLS-FF) is proposed. Compared to the traditional methods, the proposed model yields the capability to accurately estimate the battery SoC and SoH by including the real-time variation of open circuit voltage and internal resistance of a battery, respectively. Moreover, a forgetting factor is used to capture the online parameter variations by reducing the impact of the older data to keep the model simple and suitable for EV applications. To verify the validity of the proposed model, an experimental test is carried out on a 2012 Nissan Leaf 31.1 Ah Manganese-oxide Li-ion battery cell.

Publication Date


  • 2018

Citation


  • K. Sarrafan, K. Muttaqi & D. Sutanto, "Real-time estimation of model parameters and state-of-charge of lithiumion batteries in electric vehicles using recursive least-square with forgetting factor," in Proceedings of 2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2018, pp. 1-6.

Scopus Eid


  • 2-s2.0-85065960298

Start Page


  • 1

End Page


  • 6

Place Of Publication


  • United States