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| 高原环境下电荷状态对低温循环老化锂离子电池热失控特性研究 |
| Study on the thermal runaway characteristics of low-temperature cycling aged lithium-ion batteries under the influence of SOC in high-altitude environmen |
| 投稿时间：2025-05-09 修订日期：2025-06-10 |
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| 中文关键词: 锂电池热失控 低温老化 温度 质量损失 |
| 英文关键词:Battery thermal runaway Low temperature aging Temperature Quality loss. |
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| 中文摘要: |
| 本文通过-10 ℃低温循环得到不同健康状态（SOH）的锂离子电池，耦合不同电荷状态（SOC），在低压实验舱内搭建实验平台，研究低压条件下锂电池热失控过程中火灾特征参数变化。实验发现，当电池经历低温循环后，电池热稳定性降低，热失控现象更加剧烈，表面温度峰值升高。在100% SOC情况下，电池健康状态由100% SOH降低至70% SOH后，电池表面温度峰值由748.7 ℃上升至804.7 ℃。电池电荷状态越高代表内部积聚更多的能量，在各个健康状态下电池电荷状态由100% SOC降低至0% SOC，热失控临界温度上升幅度均超过25%，在100% SOH情况下增加幅度最大，达到43.2%。电池电荷状态是引起电池表面温度峰值变化的主要因素，通过对电池热失控传热过程分析，拟合得到不同健康状态下电池表面最大温度与热失控临界温度差值和电池电荷状态之间线性关系式。 |
| 英文摘要: |
| This article obtains lithium batteries with different states of health (SOH) through low-temperature cycling at -10 ℃, couples different states of charge (SOC), and builds an experimental platform in a low pressure experimental chamber to study the changes in fire characteristic parameters during thermal runaway of lithium batteries under low pressure conditions. Experiments have found that after experiencing low-temperature cycling, the thermal stability of the battery decreases, the phenomenon of thermal runaway becomes more severe, and the peak surface temperature increases. At 100% SOC, after the battery health status decreased from 100% SOH to 70% SOH, the peak surface temperature of the battery increased from 748.7 ℃ to 804.7 ℃. The higher SOC of the battery, the more energy is accumulated internally. In various healthy states, the battery charge state decreases from 100% SOC to 0% SOC, and the critical temperature for thermal runaway increases by more than 25%. The maximum increase is at 100% SOH, reaching 43.2%. The SOC is the main factor causing changes in the peak temperature of the battery surface. By analyzing the heat transfer process of battery thermal runaway, a linear relationship between the difference between the maximum temperature of the battery surface and the critical temperature of thermal runaway under different SOH and SOC of the battery is fitted. |
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