热失控
安全阀
磷酸铁锂
电池(电)
磷酸盐
锂(药物)
核工程
材料科学
环境科学
法律工程学
工程类
化学
医学
机械工程
物理
热力学
内科学
功率(物理)
有机化学
作者
Chaoshi Liu,Yong Liu,Zhixiang Cheng,Yuxuan Li,Pengjie Liu,Lin Liu,Yuanyuan Min,Qiangling Duan,Wenxin Mei,Qingsong Wang
标识
DOI:10.1016/j.psep.2025.107563
摘要
Thermal runaway (TR) of large-format lithium iron phosphate (LFP) batteries has become a critical technical issue due to its potential to cause extensive fire incidents. The safety valve (SV) plays an important role that it enables gases generated inside the battery to release promptly, thereby delaying the onset of TR ( T TR ). However, the impact of the initial setting venting pressure of the safety valve ( P sv ) on the TR behavior of lithium-ion batteries (LIBs) and the severity of the associated hazards remain unclear. To address this, this study investigates the TR behavior and associated risks of LFP batteries with different P sv under thermal abuse conditions. The results indicate that LFP batteries without SV experience combustion during TR, significantly increasing the hazard. With increasing P sv , the maximum temperature ( T max ) and peak rate of temperature rise (d T /d t ) max during TR decrease gradually. Finally, a TR assessment model is employed to evaluate the hazards of LFP batteries under different P sv . Batteries without SV exhibit the highest TR hazards, whereas those with the P sv of 0.35 MPa demonstrated the lowest hazards. However, higher P sv results in the accumulation of higher peak pressures inside the battery, thereby increasing the risk of severe safety incidents. Therefore, the selection of the appropriate P sv requires careful consideration of the battery's operational specifications and safety standards to achieve an optimal balance. This results can provide a more comprehensive theoretical and experimental basis for battery design and safety assessment by comparing battery responses under different P sv conditions.
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