首页|Thermal runaway evolution of a 280 Ah lithium-ion battery with LiFePO4 as the cathode for different heat transfer modes constructed by mechanical abuse

Thermal runaway evolution of a 280 Ah lithium-ion battery with LiFePO4 as the cathode for different heat transfer modes constructed by mechanical abuse

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
Lithium iron phosphate batteries have been increasingly utilized in recent years because their higher safety performance can improve the increasing trend of recurring thermal runaway accidents.However,the safety performance and mechanism of high-capacity lithium iron phosphate batteries under internal short-circuit challenges remain to be explored.This work analyzes the thermal runaway evolution of high-capacity LiFePO4 batteries under different internal heat transfer modes,which are con-trolled by different penetration modes.Two penetration cases involving complete penetration and incomplete penetration were detected during the test,and two modes were performed incorporating nails that either remained or were removed after penetration to comprehensively reveal the thermal run-away mechanism.A theoretical model of microcircuits and internal heat conduction is also established.The results indicated three thermal runaway evolution processes for high-capacity batteries,which cor-responded to the experimental results of thermal equilibrium,single thermal runaway,and two thermal runaway events.The difference in heat distribution in the three phenomena is determined based on the microstructure and material structure near the pinhole.By controlling the heat dissipation conditions,the time interval between two thermal runaway events can be delayed from 558 to 1417 s,accompanied by a decrease in the concentration of in-situ gas production during the second thermal runaway event.

Lithium-ion battery safetyMicro short-circuit cellHeat transfer modesInternal short circuitNail-penetration test

Zhixiang Cheng、Chengdong Wang、Wenxin Mei、Peng Qin、Junyuan Li、Qingsong Wang

展开 >

State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,Anhui,China

National Key R&D Program of ChinaChina National Postdoctoral Program for Innovative TalentsChina Postdoctoral Science FoundationYouth Innovation Promotion Association CAS

2021YFB2402001BX202202862022T150615Y201768

2024

10.1016/j.jechem.2024.01.073

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.93(6)
  • 46