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li-on battery thermal abuse trigger temperature

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Old   September 26, 2022, 00:54
Default li-on battery thermal abuse trigger temperature
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tang lei
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how to set the thermal absue trigger temperature in Fluent
Hello all, recently, I've been doing a thermal absue/runaway simulation.
I am using CHT model which has two options for the thermal source (1 equation model and four equation model).
Since I dont have enogh data from ARC, I chose 1 Equation model.
I've checked the theory guide and user guide for many times, To my understanding, there should be a temperature to trigger the thermal absue process, but I can't find this so-called "trigger temperature", then how could I tell fluent when to trigger the heat source.
There is a parameter called "degree of conversion", the default value is 1e-6. according to the differential equation in the theory guide. if the value is larger than 0, the proceess will be trigger and go on untill the "degree of conversion" equal to 1. If I set the "degree of conversion" to 0, the thermal abuse heat source will be never triggered, I did some test, the results were the same as I guess.
I also did some tests on the four equation heat abuse model, the result shows for the default parameter, the trigger temperature is 484K, but I still have not found out where to set the triiger temperature.
So, does any one who has any experiences on this model can give me a clue how to set the trigger temperature. Thanks in advance.
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Old   September 26, 2022, 01:38
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Alexander
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trigger temperature comes from the chemistry of the battery

parameter set is fitter to experimental data (ARC test)
you can put trigger temperature explicitly, as it is essential characteristic of battery, same as dimensions or materials (you may say its one of material properties)
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Old   September 26, 2022, 09:37
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Quote:
Originally Posted by AlexanderZ View Post
trigger temperature comes from the chemistry of the battery

parameter set is fitter to experimental data (ARC test)
you can put trigger temperature explicitly, as it is essential characteristic of battery, same as dimensions or materials (you may say its one of material properties)
Thanks a lot AlexanderZ, but I am still comfused, where should I set this parameter (trigger temperature) on the Fluent GUI/TUI/UDF?
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Old   September 26, 2022, 19:29
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this parameter doesn't exist, if you are talking about abuse models build in fluent

both of them represent curve fitted to ARC test
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