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How to access heat generation rate variables (Qrev, Qpol, QSEI) in Lithium-Ion Battery interface for plotting?

Posted 27 mai 2026, 23:11 UTC−4 Electromagnetics, Heat Transfer Version 6.3 0 Replies

Rifqi Nusaputra

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"Hello, I am working on a 1D SEI formation model coupled with a 3D thermal model in COMSOL Multiphysics 6.3 using the Battery Design Module. I am trying to reproduce the heat generation rate plot similar to Figure 4 in Andriunas et al. (2022), Journal of Power Sources 525, 231126, which shows the breakdown of reversible heat (Qrev), polarisation heat (Qpol), and SEI heat (QSEI) over time during discharge. My model is based on the sei_formation_seed file from the Application Library, with an added Porous Electrode Reaction 2 for the SEI forming reaction and a Film Resistance defined by thickness and conductivity (dfilm_0 and kappa_film). My questions are:

What are the correct variable names to access the individual heat generation components (reversible, irreversible/polarisation, and SEI film heat) from the Lithium-Ion Battery interface in COMSOL 6.3?
When I browse the Replace Expression tree under Component 1 > Lithium-Ion Battery, I cannot find any Heat Sources subfolder or heat-related variables. Is there a setting I need to enable first, such as the Energy Equation in the Physical Model section?
Is the SEI film heat accessible as a built-in variable from the Film Resistance section of Porous Electrode 1, or do I need to define it manually using the expression QSEI = εSEI × aj × Jj × ηSEI as described in the paper?
If I need to define the heat variables manually, what are the correct COMSOL variable names for εSEI (SEI volume fraction), aj (specific surface area), iloc (local current density for SEI reaction), and ηSEI (voltage drop over SEI) within the Lithium-Ion Battery interface?

Any help would be greatly appreciated. Thank you."

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