MODELING METHOD FOR LITHIUM-ION BATTERIES CONSIDERING ELECTRO-THERMAL COUPLING EFFECTS

Liu Wei, Teh Jiashen, Meng Deyue, Yang Geng, Liu Lizhen

Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 323-332.

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 323-332. DOI: 10.19912/j.0254-0096.tynxb.2024-0854

MODELING METHOD FOR LITHIUM-ION BATTERIES CONSIDERING ELECTRO-THERMAL COUPLING EFFECTS

  • Liu Wei1,2, Teh Jiashen2, Meng Deyue1, Yang Geng3, Liu Lizhen1,2
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Abstract

To address the difficulty of analytical modeling of the internal resistance and incremental capacity of lithium-ion batteries, this paper proposes a mechanism-based modeling method with battery current and temperature as inputs variables and the internal resistance and incremental capacity as outputs. Firstly, the method constructs a voltage mechanism model based on the Arrhenius equation, which can quantitatively describe the voltage under the influence of current, temperature and other variables, as well as a Bernardi thermal mechanism model under the influence of current, voltage and other variables. Secondly, the coupling effects between the above two models and between the variables are decoupled through well-designed experiments. Then, the analytical model for internal resistance and incremental capacity analytical model are further derived. The experimental results show that the proposed method requires minimal experimentalal effect and can accurately estimate the battery voltage, internal resistance and incremental capacity. The voltage error is lower than 0.3‰ and the internal resistance error is lower than 1.2%.

Key words

lithium-ion batteries / voltage measurement / thermal modeling / resistance / capacity / electro-thermal coupling

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Liu Wei, Teh Jiashen, Meng Deyue, Yang Geng, Liu Lizhen. MODELING METHOD FOR LITHIUM-ION BATTERIES CONSIDERING ELECTRO-THERMAL COUPLING EFFECTS[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 323-332 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0854

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