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"In Battery Current Distribution" singularity when modelling Charge-Discharge cycling (with constant voltage charging)

Posted Sep 20, 2024, 8:18 a.m. EDT Battery Design, Electrochemistry, Studies & Solvers Version 6.2 0 Replies

Daniel Reinowski

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Hello,

I'm very new to modeling in general, and COMSOL in particular, so I'm having difficulty troubleshooting this particular issue.

I have made a simple charge-discharge model based on the li_battery_tutorial_2d (2D test copy.mph file attached), and it works without issues, it will perform as many cycles as I want and terminate when told.

However then I modified the geometry and materials to reflect a real LFP cell cross-section (2D test LFP copy.mph attached). Now it throws up a singularity error in the current distribution calculation when getting close to the voltage cutoff, specifically:

And

I enabled the automatic mesh refinement in the Initialisation and reduced the Tolerance Factor in the Absolute Tolerance of the Time-Dependent Solver, but that doesn't seem to have much effect aside from making the solution take longer until running into the same issue.

I just can't see where exactly is the core of the issue, why do the two behave so differently. Judging by the mesh refinement, the problem is with the Positive Electrode, but I honestly can't tell why exactly.

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