Electrochemical-thermal modeling of phase change material battery thermal management systems: investigating mesh types for accurate simulations
Bibliographic record
Abstract
• Electrochemical-thermal model is used to simulate a lithium-ion battery. • Transient enthalpy-porosity method is employed for phase change material simulation. • Three mesh types are studied to identify the best simulation guidelines. • Polyhedral mesh is recommended for its low computational cost. • Hexahedral mesh showed the best agreement with experimental data. • A hybrid mesh configuration is introduced. Computational techniques have been extensively used in the analysis of heat transfer within battery thermal management systems (BTMS). A fundamental and critical initial step in any numerical analysis is the meshing process, which involves subdividing the geometry into numerous small control volumes, or elements. Here, we investigated the accuracy of the simulated thermal performance of a BTMS using phase change material (PCM) with three different mesh types having: hexahedral, tetrahedral, and polyhedral elements. A detailed electrochemical-thermal model is used for modeling heat generation within a lithium-ion battery. In this model, a pseudo two-dimensional model captures the internal dynamics of the battery and then is integrated with a three-dimensional conjugate heat transfer model. Furthermore, the enthalpy-porosity method is employed for PCM simulation using computational fluid dynamics. Among the three mesh types, the hexahedral mesh demonstrated the closest agreement with experimental data, yielding smooth temperature gradients and PCM liquid fraction contours in post-processing. The polyhedral mesh, while slightly less accurate than the hexahedral mesh, provided a computational advantage, requiring only about a fifth of the elements compared to the hexahedral mesh and a quarter compared to the tetrahedral mesh. This computational efficiency makes the polyhedral mesh the most economical in terms of computational resources. However, tetrahedral mesh, though better suited for complex geometries, exhibited the highest computational cost and produced the least accurate results, making it less favorable for PCM-based BTMS simulations. To further improve the trade-off between computational cost and accuracy, a hybrid mesh configuration is introduced, combining polyhedral and hexahedral elements to enhance simulation efficiency while preserving accuracy.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".