The Modeling and SOC Estimation of a LiFePO4 Battery Considering the Relaxation and Overshoot of Polarization Voltage Article Swipe

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Guorong Zhu , Oukai Wu , Qian Wang , Jianqiang Kang , Jing V. Wang ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.3390/batteries9070369

A triple polarization (TP) model is proposed based on the second-order RC hysteresis equivalent circuit model, in order to more precisely reflect the dynamic and static characteristics of a LiFePO4 (LFP) battery, considering the long relaxation time and overshoot of its polarization voltage. The TP model introduces an RC link, whose time constant varies with changes in the battery operating status to represent the fast build-up and slow relaxation of the polarization voltage. Specifically, such an RC link evolves into an RLC parallel link during charging to reveal the overshoot characteristic. In this way, the external characteristics of LFP batteries, considering the complex phase transition process, are simulated by a simple equivalent circuit. Constant-current pulse tests are performed to verify the proposed model. For application, a state-of-charge (SOC) estimation is implemented on the basis of the TP model, with the use of a transformed cubature Kalman Filter (TCKF). The experimental results show that the TP model is able to represent the dynamic and static characteristics, as well as estimate the SOC of an LFP battery with a good accuracy.

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Overshoot (microwave communication) RC circuit Voltage Control theory (sociology) Equivalent circuit Polarization (electrochemistry) State of charge Computer science Battery (electricity) Time constant Constant current Materials science Electronic engineering Capacitor Electrical engineering Physics Engineering Power (physics) Chemistry Telecommunications Quantum mechanics Physical chemistry Control (management) Artificial intelligence

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Type: article
Language: en
Landing Page: https://doi.org/10.3390/batteries9070369
PDF: https://www.mdpi.com/2313-0105/9/7/369/pdf?version=1688910284
OA Status: gold
Cited By: 8
References: 34
Related Works: 10
OpenAlex ID: https://openalex.org/W4383736747

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DOI: https://doi.org/10.3390/batteries9070369

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Title: The Modeling and SOC Estimation of a LiFePO4 Battery Considering the Relaxation and Overshoot of Polarization Voltage

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Type: article

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Language: en

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Publication year: 2023

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Publication date: 2023-07-09

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Authors: Guorong Zhu, Oukai Wu, Qian Wang, Jianqiang Kang, Jing V. Wang

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Landing page: https://doi.org/10.3390/batteries9070369

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Concepts: Overshoot (microwave communication), RC circuit, Voltage, Control theory (sociology), Equivalent circuit, Polarization (electrochemistry), State of charge, Computer science, Battery (electricity), Time constant, Constant current, Materials science, Electronic engineering, Capacitor, Electrical engineering, Physics, Engineering, Power (physics), Chemistry, Telecommunications, Quantum mechanics, Physical chemistry, Control (management), Artificial intelligence

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Cited by: 8

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