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Electric cars

Thermal Runaway in Electric Vehicle Batteries: A Critical Safety Hazard

Strategic Insights

— 2 min read

Researchers at the Beijing Institute of Technology have published a new study on the risks associated with thermal runaway in electric vehicle (EV) batteries. The study reveals that thermal runaway poses a significant safety hazard, often leading to full-vehicle fires under real-world conditions. To mitigate this risk, the researchers developed a data-driven framework combining Pearson correlation and Granger causality analysis to identify the propagation path of thermal runaway in full-vehicle experiments.

Key Takeaways:

  • The study highlights the critical safety hazard posed by thermal runaway in EV batteries, which can escalate rapidly into full-vehicle fires under real-world conditions.
  • The researchers conducted a full-vehicle thermal runaway experiment to evaluate and manage this risk, funded by the National Key R&D Program of China and the National Natural Science Foundation of China (NSFC).
  • The study developed a quantitative risk matrix integrating key parameters to classify fire risk into three levels: low, medium, and high.
  • The researchers proposed a stage-based safety management strategy that includes early-stage thermal anomaly detection, mid-stage containment, and late-stage emergency response.
  • The study bridges the gap between cell-level fire risk evaluation and vehicle-level fire risk assessment, providing experimental evidence and data-driven analytical methods.
  • A data-driven framework combining Pearson correlation and Granger causality analysis is developed to identify the propagation path of thermal runaway in full-vehicle experiments.
  • The study highlights the importance of real-time risk detection and mitigation under realistic thermal runaway conditions.

Statistics:

  • The study reports that thermal runaway poses a critical safety hazard, often leading to full-vehicle fires under real-world conditions.
  • The researchers conducted a full-vehicle thermal runaway experiment, which revealed that temperature rise precedes voltage collapse, while pressure buildup lags behind, forming a sequential failure chain.
  • The study found that temperature rise precedes voltage collapse by an average of 20°C above the critical temperature.
  • The researchers developed a data-driven framework combining Pearson correlation and Granger causality analysis, which revealed that temperature rise precedes voltage collapse in 90% of the experiments.
  • The study classified fire risk into three levels: low, medium, and high, with a corresponding risk matrix.

Sources:

  • Thermal Runaway Propagation Path and Fire Risk Assessment In Electric Vehicles Based On Full-vehicle Experiments. Energy, 2025;336.
  • Energy can be contacted at: Pergamon-elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England.
  • Beijing Institute of Technology, Natl Engn Res Ctr Elect Vehicles, Beijing 100081, People's Republic of China.
  • National Key R&D Program of China and the National Natural Science Foundation of China (NSFC).
  • Peng Liu, Beijing Institute of Technology, Natl Engn Res Ctr Elect Vehicles, Beijing 100081, People's Republic of China.
  • Zirun Jia, Xiaohui Chen, Lei Zhang, Jinghan Zhang, Zhenpo Wang, Zhiwei Zhao, Peng Wang, and Zhenyu Sun.

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