Analysis of the relationship between battery internal resistance and SOC

Biao Chen; Hui Liu; Qian Liu

doi:10.1117/12.2658855

23 November 2022 Analysis of the relationship between battery internal resistance and SOC

Biao Chen, Hui Liu, Qian Liu

Proceedings Volume 12454, International Symposium on Robotics, Artificial Intelligence, and Information Engineering (RAIIE 2022); 124540R (2022) https://doi.org/10.1117/12.2658855
Event: International Symposium on Robotics, Artificial Intelligence, and Information Engineering (RAIIE 2022), 2022, Hohhot, China

Abstract

The estimation of battery SOC is the core problem to be solved in the design of BMS. The accuracy of SOC estimation will directly affect the control decision of battery management system, and then affect the service life and efficiency of battery pack. In this paper, the relationship between internal resistance and SOC is analyzed by electrochemical impedance spectroscopy algorithm. It is found that the ohmic resistance RΩ, cathodic polarization resistance R2 and the total internal resistance of the battery in the equivalent circuit decrease with the increase of SOC, while there is no clear corresponding relationship between other element parameters and SOC in the equivalent circuit.

Citation Download Citation

Biao Chen, Hui Liu, and Qian Liu "Analysis of the relationship between battery internal resistance and SOC", Proc. SPIE 12454, International Symposium on Robotics, Artificial Intelligence, and Information Engineering (RAIIE 2022), 124540R (23 November 2022); https://doi.org/10.1117/12.2658855

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