NaS-batteries have an operating temperature between 300 Cel and 370 Cel. Therefore, the thermal management system (tms) must be able to heat the battery to those temperatures and to maintain an even temperature profile under all operating, conditions. The max. temperature differences within the cell matrix should not exceed 25 K horizontally and 20 K vertically. To reduce the experiments in developing thermal management systems two problems have to be solved mathematically: 1. Heating of the incoming in the dividing header of the direct cooling system. This requires the knowledge of the Nusselt-numbers for the specific conditions: i.e. thermally and hydrodynamically developing flow in a high aspect ration tube with a prescribed velocity profile at the entrance, one porous wall and no constant axial and peripheral wall heat flux. 2. Transient heat transfer within the cell matrix. This requires the development of simple mathematical models, which have to be verified experimentally.
Design of the thermal management systems for NaS-traction-batteries by using battery models
Auslegung von Systemen zur Waermebereitstellung fuer Natrium/Schwefel-Batterien fuer die Elektrotraktion unter Verwendung von Batteriemodellen
1985
2 Seiten
Conference paper
English