锂离子电池热失控前锋面速度研究
Theoretical and Numerical Analysis for Thermal Runaway Front Velocity of Lithium-ion Battery
章方树 1冯旭宁1
作者信息
- 1. 清华大学智能绿色车辆与交通全国重点实验室,北京 100084
- 折叠
摘要
锂离子电池的安全问题始终阻碍着电动汽车的推广,其安全问题的本质为锂离子电池热失控.锂离子电池的热失控通常是在电池内局部发生,进而以热失控前锋面的方式蔓延到电池整体,该蔓延现象在大容量、大体积电池内尤为明显.本文基于传热学原理,对锂离子电池热失控前锋面速度公式进行了推导,经过验证,该公式可精确预测电池热失控前锋面速度,精确度达到85.34％.本文推导的前锋面公式适用于不同体系的锂离子电池,可直接用来预测电池热失控蔓延速度,指导高安全电池设计.
Abstract
The safety issue of lithium-ion batteries has hindered the widespread use of electric vehicles due to thermal runaway.Typically,thermal runaway occurs locally within the battery and propagates to the overall battery.This phenomenon is particularly noticeable in large-format batteries.In this paper,we derived a formula for the thermal runaway front velocity within lithium-ion batteries based on principles of heat transfer.We verified its accuracy,which reached 85.34％.This formula is applicable to different types of lithium-ion batteries and can be used to predict their thermal runaway front velocity for guiding high-safety battery design.
关键词
锂离子电池/热失控/热失控前锋面/热传导Key words
lithium-ion battery/thermal runaway/thermal runaway front/heat transfer引用本文复制引用
出版年
2024
NETL
NSTL
万方数据