Thermal Analysis of Primary Cylindrical Lithium Cells

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Abstract
The purpose of the present thermal analysis was to better understand the safety problems of primary cells by developing a transient thermal modeling tool. Internal cell temperatures and heat generation rates were predicted for moderate and extremely high discharge rates of cells. The validity of the present methodology was checked by comparing the predicted heat generation rates with those obtained from electrochemical heating. Predicted results showed that internal cell temperatures would exceed the melting point of sulfur, 112°C, in 2 min and that of lithium, 180.5°C, in 4.8 min at extremely high discharge rates. The core temperature exceeded the melting point of sulfur at at moderate discharge rates while the wall temperature remained well below that.

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