Fast cycle life evaluation method for ternary lithium‑ion batteries based on divided SOC intervals

Ternary lithium-ion batteries are commonly used in electrical power systems. It is necessary to accurately estimate the life characteristics of the battery cell/pack under specific cycle conditions. In this article, the empirical model of the capacity attenuation value is improved, and a mathematical model of the capacity attenuation rate is established. The cell capacity value based on the entire state of charge (SOC) interval and the divided SOC intervals are identified. The difference between them is calculated and analyzed. A multiple regression model is presented to describe the linear relationship between the health state parameters and the capacity value of a ternary lithium-on battery. Finally, an accelerated aging test is introduced, and a fast cycle life evaluation method is proposed. The proposed method is validated with experimental data under different charge/discharge currents. The obtained results show that the new model and the algorithms trained by divided SOC intervals are effective. They also show that the cycle life estimation error can be ranged within 3%. In addition, the cycle time of the aging test can be reduced to about one fifth of that with the traditional method.

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Cite this article

[IEEE Style]

Q. Wang, J. Sun, H. Wu, W. Qi, H. Jin, L. Ling, "Fast cycle life evaluation method for ternary lithium‑ion batteries based on divided SOC intervals," Journal of Power Electronics, vol. 22, no. 5, pp. 831-840, 2022. DOI: 10.1007/s43236-022-00403-3.

[ACM Style]

Qiuting Wang, Jiani Sun, Hong Wu, Wei Qi, Hui Jin, and Li Ling. 2022. Fast cycle life evaluation method for ternary lithium‑ion batteries based on divided SOC intervals. Journal of Power Electronics, 22, 5, (2022), 831-840. DOI: 10.1007/s43236-022-00403-3.