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<p>In recent years, frequent fire accidents with lithium-ion batteries have seriously restricted the application and development of lithium-ion batteries in energy storage and other fields. To study the fire extinguishing agent for thermal runaway of lithium-ion batteries, a self-built fire extinguishing experimental platform was established. Then, expandable vermiculite powder was selected and modified by inorganic salts for fire extinguishing experiments. Under the same working conditions, a comparative analysis was conducted on the fire extinguishing time, temperature suppression efficiency, reignition situation, and toxicity inhibition effect of different fire extinguishing agents and ABC dry powder. The results show that, in terms of fire extinguishing time, the fire extinguishing effect is ranked from high to low as MgCl<sub>2</sub> vermiculite powder, NaHCO<sub>3</sub> vermiculite powder, 45&#xa0;μm vermiculite powder, 100&#xa0;μm vermiculite powder, 75&#xa0;μm vermiculite powder, and ABC dry powder. As for the temperature rise inhibition effect, the order of superiority is MgCl<sub>2</sub> vermiculite powder, NaHCO<sub>3</sub> vermiculite powder, 45&#xa0;μm vermiculite powder, 75&#xa0;μm vermiculite powder, 100&#xa0;μm vermiculite powder, and ABC dry powder. The advantages of each fire extinguishing agent in reducing the suffocation toxicity of fire extinguishing systems are ranked as MgCl<sub>2</sub> vermiculite powder, NaHCO<sub>3</sub> vermiculite powder, 45&#xa0;μm vermiculite powder, 100&#xa0;μm vermiculite powder, 75&#xa0;μm vermiculite powder, and ABC dry powder. At last, from the perspective of reignition, MgCl<sub>2</sub> vermiculite powder did not show any reignition after extinguishing, while other extinguishing media showed reignition. Overall, MgCl<sub>2</sub> vermiculite powder has the best extinguishing efficiency.</p>

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Research on the Inhibition of Thermal Runaway in Power Lithium-Ion Batteries by Modified Vermiculite Powder

  • 期刊论文

  • 发表日期：

    2025年1月20日

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  • Yaqin Shi,
  • Zhixiang Xing,
  • Yecheng Liu,
  • Ming Peng,
  • Longtai Qi

摘要

In recent years, frequent fire accidents with lithium-ion batteries have seriously restricted the application and development of lithium-ion batteries in energy storage and other fields. To study the fire extinguishing agent for thermal runaway of lithium-ion batteries, a self-built fire extinguishing experimental platform was established. Then, expandable vermiculite powder was selected and modified by inorganic salts for fire extinguishing experiments. Under the same working conditions, a comparative analysis was conducted on the fire extinguishing time, temperature suppression efficiency, reignition situation, and toxicity inhibition effect of different fire extinguishing agents and ABC dry powder. The results show that, in terms of fire extinguishing time, the fire extinguishing effect is ranked from high to low as MgCl2 vermiculite powder, NaHCO3 vermiculite powder, 45 μm vermiculite powder, 100 μm vermiculite powder, 75 μm vermiculite powder, and ABC dry powder. As for the temperature rise inhibition effect, the order of superiority is MgCl2 vermiculite powder, NaHCO3 vermiculite powder, 45 μm vermiculite powder, 75 μm vermiculite powder, 100 μm vermiculite powder, and ABC dry powder. The advantages of each fire extinguishing agent in reducing the suffocation toxicity of fire extinguishing systems are ranked as MgCl2 vermiculite powder, NaHCO3 vermiculite powder, 45 μm vermiculite powder, 100 μm vermiculite powder, 75 μm vermiculite powder, and ABC dry powder. At last, from the perspective of reignition, MgCl2 vermiculite powder did not show any reignition after extinguishing, while other extinguishing media showed reignition. Overall, MgCl2 vermiculite powder has the best extinguishing efficiency.