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首页> 外文期刊>SAE International Journal of Electrified Vehicles >Analysis of Lithium-Ion Battery through Direct Current Internal Resistance Characteristic
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Analysis of Lithium-Ion Battery through Direct Current Internal Resistance Characteristic

机译：Analysis of Lithium-Ion Battery through Direct Current Internal Resistance Characteristic

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摘要

The accuracy of real-time status assessment during the charging and discharging process of the lithium-ion battery directly affects driving safety, and high-precision evaluation of real-time status has always been an important research area. The direct current internal resistance (DCIR) characteristic of the battery is an important characteristic of the battery. The discharge process at a temperature of 25℃ is studied in this article. The results show that DCIR under dual-current test and single-current test have similar trends with different states of charge (SOCs) during the discharge process, and the main difference between them is reflected in the polarization internal resistance (IR). The relationship and difference between the DCIR value under the dual-current test and the fitted value based on the fully discharged state are studied, and the error value between the calculated value and the fitted value of the corresponding SOC is within 5 mΩ. The article also proposes a real-time state evaluation model based on DCIR in which the evaluation error of the battery in the early discharge state is within 50 mV by adjusting the parameter K. There are certain connections and differences between DCIR obtained by dual-current test and single-current test in different SOCs. In this article, the battery status during the discharge process is evaluated based on DCIR obtained by dual-current test and single-current test, but the optimization algorithm for designing the battery status in combination with DCIR, different temperature gradients, and charge and discharge rates needs to be further studied.

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