Battery
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To add to my question:


The images below are from the paper: "Transient Temperature Distributions on Lithium-Ion Polymer SLI Battery" by Yiqun Liu, Y. Gene Liao * and Ming-Chia Lai. This paper describes how the thermal models should look like. It says that the cells in the middle have the highest temperature because heat accumulated in the middle of the pack is more difficult to dissipate.