首页|Mechanism of internal thermal runaway propagation in blade batteries

Mechanism of internal thermal runaway propagation in blade batteries

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
Blade batteries are extensively used in electric vehicles,but unavoidable thermal runaway is an inherent threat to their safe use.This study experimentally investigated the mechanism underlying thermal run-away propagation within a blade battery by using a nail to trigger thermal runaway and thermocouples to track its propagation inside a cell.The results showed that the internal thermal runaway could prop-agate for up to 272 s,which is comparable to that of a traditional battery module.The velocity of the ther-mal runaway propagation fluctuated between 1 and 8 mm s-1,depending on both the electrolyte content and high-temperature gas diffusion.In the early stages of thermal runaway,the electrolyte participated in the reaction,which intensified the thermal runaway and accelerated its propagation.As the battery temperature increased,the electrolyte evaporated,which attenuated the acceleration effect.Gas diffusion affected thermal runaway propagation through both heat transfer and mass transfer.The experimental results indicated that gas diffusion accelerated the velocity of thermal runaway propagation by 36.84％.We used a 1D mathematical model and confirmed that convective heat transfer induced by gas diffusion increased the velocity of thermal runaway propagation by 5.46％-17.06％.Finally,the temperature rate curve was analyzed,and a three-stage mechanism for internal thermal runaway propagation was pro-posed.In Stage Ⅰ,convective heat transfer from electrolyte evaporation locally increased the temperature to 100 ℃.In Stage Ⅱ,solid heat transfer locally increases the temperature to trigger thermal runaway.In Stage Ⅲ,thermal runaway sharply increases the local temperature.The proposed mechanism sheds light on the internal thermal runaway propagation of blade batteries and offers valuable insights into safety considerations for future design.

L ithium-ion batteryBlade batteryThermal runawayInternal thermal runaway propagation

Xuning Feng、Fangshu Zhang、Wensheng Huang、Yong Peng、Chengshan Xu、Minggao Ouyang

展开 >

School of Vehicle and Mobility,Tsinghua University,Beijing 100084,China

National Key R&D Program-Strategic Scientific and Technological Innovation CooperationNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2022YFE02079005170611752076121

2024

10.1016/j.jechem.2023.09.050

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)：2024.89(2)
  • 44