首页|Blocking thermal runaway propagation in large-format sodium-ion battery system through localized energy release

Blocking thermal runaway propagation in large-format sodium-ion battery system through localized energy release

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Blocking thermal runaway propagation in large-format sodium-ion battery system through localized energy release
Cascading thermal runaway(TR)propagation poses a critical safety concern for large-format sodium-ion battery(SIB)systems because of the heightened risks of fires or explosions.However,effectively sup-pressing TR propagation without introducing unintended side effects remains a significant challenge.Herein,we demonstrate a localized energy release method to mitigate TR,by reducing the state of charge(SOC)of cells adjacent to the thermally runaway unit.We discover that as the SOCs decreased from 100％to 25％,the TR trigger temperature decreased significantly,and the maximum temperature decrease from 367 to 229 ℃.Meanwhile,the volume of gas decreased to one-third of its original value,while the range of explosion limits significantly narrowed.The analysis of the morphology of the debris further confirms that the structural damage is greater at higher SOC levels.Moreover,an Entropy Weight and Technique for Order Preference by Similarity to an Ideal Solution(EW-TOPSIS)method has been established to assess the safety status of SIBs,showing that the TR possibility is nearly linear with the SOCs,and the TR hazard is exponentially related to the SOCs.Finally,when the SOC of cells adjacent to the TR cell is reduced to 25％,TR can be directly blocked without the need for additional cooling or thermal insulation methods.This study not only advances the understanding of TR behavior in SIBs but also offers a straight-forward approach to mitigating the TR risk in SIB systems.

Sodium-ion batteryThermal runawaySafety assessmentLocalized energy release

Yongchun Dang、Yongchao Yu、Zhenpo Wang、Peng Liu、Xunli Zhou、Yongjie Zhao、Peipei Qi、Fei Xu、Lei Li

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National Engineering Research Center of Electric Vehicles,Beijing Co-Innovation Centre for Electric Vehicles,Beijing Institute of Technology,Beijing 100081,China

Beijing Institute of Technology Chongqing Innovation Center,Chongqing 401120,China

Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications,School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China

Research Center of Do-Fluoride New Energy Technology Co.,Ltd.,Jiaozuo 454003,Henan,China

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Sodium-ion battery Thermal runaway Safety assessment Localized energy release

2025

10.1016/j.jechem.2025.01.008

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

影响因子：0.654
ISSN：2095-4956
年,卷(期)：2025.104(5)