基于CFD的锂离子电池热失控多米诺效应研究

为研究空运包装内锂离子电池单元热失控传递的控制方法,首次提出锂离子电池热失控传递的多米诺效应理论模型.依据实际包装情况建立了包装盒内9个18650型锂离子电池的有限元模型,利用基于计算流体动力学的仿真软件Fluent对锂离子电池的热失控传递过程进行数值模拟;结合模拟结果定量分析锂离子电池热失控传递中的多米诺效应及电池单元热失控对临近电池温升的影响,以及通过控制电池放热和使用阻燃隔板来延缓包装内电池热失控传递的可行性.模拟结果不仅验证了构建的理论模型与数值模拟结果的一致性,并且显示基于理论模型参数提出的两种控制方法对延缓电池的热失控传递都具有显著效果.不仅可为控制空运锂离子电池热失控提供理论依据,还可对锂离子电池空运包装标准的制定提供技术参考.

Lithium-ion Battery Thermal Runaway Domino Effect Analysis Based on the CFD

In order to study the thermal runaway transmission of lithium-ion battery in packing, this paper first proposed the Lithium-ion Battery Thermal Runaway Domino Effect Theoretical Model. 18650 type lithium-ion battery finite element model of 9 batteries is established based on the actual situation. In the simulation part, the CFD software Fluent was used to simulate the thermal runaway transfer process. Combined with quantitative analysis of simulation results in the domino effect model, the impact of thermal runaway cell temperature changing was studied, verification the feasibility of slow the thermal runaway transfer by controlling the generation of heat and flame baffle. The results not only validate the consistency between theoretical model and numerical simulation results, but also demonstrate two control methods proposed by model parameters have a significant effect on thermal runaway transfer delay. The study provides a theoretical basis for the control of air lithium-ion battery thermal runaway, as well as technical reference for the lithium-ion battery packing standards.