Research on Internal Temperature Estimation and ISC Diagnosis Strategy of Lithium-ion Batteries Based on EIS

被引：0

作者：

Junqiu, Li ^{[1
]}

Ziming, Liu ^{[1
]}

Zhengnan, Liu ^{[1
]}

Zhixiong, Chai ^{[1
]}

机构：

[1] Beijing Institute of Technology, National Engineering Research Center of Electric Vehicles, Beijing

来源：

Qiche Gongcheng/Automotive Engineering | 2025年 / 47卷 / 06期

关键词：

electrochemical impedance spectroscopy; internal short circuit diagnosis; internal temperature estimation; lithium-ion battery;

D O I：

10.19562/j.chinasae.qcgc.2025.06.010

中图分类号：

学科分类号：

摘要：

Internal short circuit（ISC）fault of lithim-ion batteries in new energy vehicles ，as a critical stage in the evolution of battery thermal runaway，pose significant threats to battery safety. There is currently a lack of relevant technologies for real-time diagnosis of ISC in lithium-ion batteries，but electrochemical impedance spec⁃ troscopy（EIS）technology has shown great potential for ISC diagnosis. In this paper，a research on online ISC diag⁃ nosis strategies is conducted for lithium-ion batteries based on EIS measurement chips. A DNB chip based EIS on⁃ line measurement scheme for lithium-ion batteries is constructed，and EIS measurement experiments for ISC batter⁃ ies are completed. The EIS response and internal average temperature change laws under ISC are obtained，and tem⁃ perature sensitive impedance characteristic frequencies are extracted. The experiments show that the measurement scheme has a relative error of impedance modulus less than 5% in the frequency range of 1 kHz-0.1 Hz，and an im⁃ pedance phase angle measurement error less than 2° below 100 Hz. A model for estimating the average internal tem⁃ perature of batteries based on impedance phase angle is established，and a real-time diagnosis strategy for ISC based on EIS temperature monitoring is developed. Four series connected LFP batteries experiments show that com⁃ pared with traditional surface temperature based diagnosis strategies，this strategy shortened the diagnosis time by 1 400 s ，with the accuracy of ISC resistance estimation increased by 30%. © 2025, SAE-China. All rights reserved.

引用

页码：1112 / 1121

页数：9

共 20 条

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