Measurements and modeling to determine the critical temperature for preventing thermal runaway in Li-ion cells
| Autor: | Iretomiwa Esho, Krishna Shah, Ankur Jain |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Thermal runaway 020209 energy Energy Engineering and Power Technology 02 engineering and technology Heat transfer coefficient Mechanics Thermal conduction Electrochemical energy conversion Industrial and Manufacturing Engineering Thermal conductivity Heat generation Thermal 0202 electrical engineering electronic engineering information engineering Overheating (electricity) |
| Zdroj: | Applied Thermal Engineering. 145:287-294 |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2018.09.016 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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