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- W2891943547 abstract "Abstract Li-ion cells are widely used for electrochemical energy conversion and storage, but suffer from safety problems due to overheating. At elevated temperatures, the cell enters a state of thermal runaway involving multiple heat-generating decomposition reactions that eventually lead to fire and explosion. Understanding the nature of thermal runaway, specifically the highest temperature that a cell can safely withstand, is critical for improving cell safety. This paper presents an experimentally validated method to predict the critical temperature based on the thermal balance between temperature-dependent heat generation, thermal conduction in the cell and heat dissipation on the cell surface. It is shown that for a single reaction case, the critical temperature can be determined from the root of a non-linear, transcendental equation involving parameters that characterize these processes. A computational model for a more realistic but complicated case of multiple reactions with reactant consumption is also presented. The predicted critical temperature is found to be in good agreement with experimental measurements on a thermal test cell in a wide range of thermal parameters. Trade-offs between cell thermal conductivity and convective heat transfer coefficient are shown to dramatically influence the critical temperature. Results presented here enable accurate prediction of the critical temperature of a Li-ion cell in a given thermal environment, and therefore, may contribute towards improved safety in the storage, transportation and operation of Li-ion cells." @default.
- W2891943547 created "2018-09-27" @default.
- W2891943547 creator A5024539248 @default.
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- W2891943547 date "2018-12-01" @default.
- W2891943547 modified "2023-10-10" @default.
- W2891943547 title "Measurements and modeling to determine the critical temperature for preventing thermal runaway in Li-ion cells" @default.
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- W2891943547 doi "https://doi.org/10.1016/j.applthermaleng.2018.09.016" @default.
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