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<p>The influence of state of charge (SOC) on external short circuit (ESC) of fresh And aged batteries is studied in this research. The results indicated that the effect of SOC on ESC changes after battery aging. Based on the maximum temperature, the safety of fresh battery And aged battery are ranked as: 100% SOC &gt; 40% SOC &gt; 70% SOC (fresh), 100% SOC &gt; 70% SOC &gt; 40% SOC (90% And 80% state of health (SOH)). However, thermal runaway is prone to occur for battery with 40% SOC when the SOH is 80%. Thermal runaway does not occur to fresh battery. Joule Heat from polarization contributes the most to the total heat generation. Thermal runaway occurs after SOH lower than And equal to 90%, except for battery with 90% SOH And 40% SOC at ambient temperature higher than And equal to 28&#xa0;°C. Low ambient temperature decreases safety for lithium-ion battery during ESC. The heat generated by micro internal short circuit is high enough to trigger thermal runaway for aged battery. With the decrease of SOH, the influence of SOH on ESC is more significant than SOC. The results are important to thermal runaway prevention of aged lithium-ion batteries.</p>

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Influence of state of charge on external short circuit of fresh and aged batteries

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Jialong Liu,
  • Lei Sun,
  • Dongliang Guo,
  • Jialei Liu,
  • Yun Zhang,
  • Zhirong Wang

摘要

The influence of state of charge (SOC) on external short circuit (ESC) of fresh And aged batteries is studied in this research. The results indicated that the effect of SOC on ESC changes after battery aging. Based on the maximum temperature, the safety of fresh battery And aged battery are ranked as: 100% SOC > 40% SOC > 70% SOC (fresh), 100% SOC > 70% SOC > 40% SOC (90% And 80% state of health (SOH)). However, thermal runaway is prone to occur for battery with 40% SOC when the SOH is 80%. Thermal runaway does not occur to fresh battery. Joule Heat from polarization contributes the most to the total heat generation. Thermal runaway occurs after SOH lower than And equal to 90%, except for battery with 90% SOH And 40% SOC at ambient temperature higher than And equal to 28 °C. Low ambient temperature decreases safety for lithium-ion battery during ESC. The heat generated by micro internal short circuit is high enough to trigger thermal runaway for aged battery. With the decrease of SOH, the influence of SOH on ESC is more significant than SOC. The results are important to thermal runaway prevention of aged lithium-ion batteries.