Journal of Applied Electrochemistry

, Volume 14, Issue 1, pp 39–46 | Cite as

Thermal properties of sodium-sulphur cells

  • Reinhard Knödler


The heat capacity and the rate of heat generation of Na/S cells during discharge and charge were determined. The measurements were carried out in a furnace with very low heat loss and low heat capacity (quasi-adiabatic arrangement). A linear relationship between (1/I)(dT/dt) andI, whereI is the discharge or charge current and dT/dt the temperature gradient, was obtained. From these plots the heat capacity of the cell and the entropy term could be determined. It turned out that, due to a steep entropy increase beyond about 80% state of discharge, the heat generation rate increased strongly in this region. During charging, this effect causes a cooling effect at low currents. The data presented here are important for the design of the thermal management system of an electric vehicle battery.


Entropy Heat Capacity Heat Loss Generation Rate Heat Generation 
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Copyright information

© Chapman and Hall Ltd. 1984

Authors and Affiliations

  • Reinhard Knödler
    • 1
  1. 1.Central Research LaboratoryBrown, Boveri and Cie AGHeidelbergFRG

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