# How to couple SIB basic DFN with a thermal model?

**URL:** <https://pybamm.discourse.group/t/how-to-couple-sib-basic-dfn-with-a-thermal-model/300>\
**Category:** General\
**Created:** [10 April 2025 12:07 UTC](https://pybamm.discourse.group/t/how-to-couple-sib-basic-dfn-with-a-thermal-model/300 "2025-04-10T12:07:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rookie](https://avatars.discourse-cdn.com/v4/letter/r/e47c2d/32.png) [@Rookie](https://pybamm.discourse.group/u/Rookie)\
**Post date:** [10 April 2025 12:07 UTC](https://pybamm.discourse.group/t/how-to-couple-sib-basic-dfn-with-a-thermal-model/300/1 "2025-04-10T12:07:35Z")

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Hello,  
I am a student and I want to simulate a Sodium-Ion Battery (SIB) using the `sodium_ion.BasicDFN` model. I want to couple it with a lumped thermal submodel, but it doesn’t work. I am quite sure it’s because of the missing implementation in the `BasicDFN` . There are far fewer variables in the basic model. However, I don’t know what to do or add to enhance the `BasicDFN` to get the thermal models to run. Or is it easier to create a thermal model on my own?  
Thank you for your help! (bearbeitet)