Title :
Electrode properties and heat generation rate in Ni-Cd, Ni-H2 and Ni-MH cells
Author :
Vaidyanathan, Hari ; Rao, Gopalakrishna M.
Author_Institution :
COMSAT Lab., Clarksburg, MD, USA
fDate :
27 Jul-1 Aug 1997
Abstract :
The electrode properties and heat generation rates of Ni-Cd, Ni-H 2 and Ni-MH secondary battery cells during charge and discharge are compared based on experimental data obtained using a radiative-type calorimeter. For all three cell types, a region of endothermic cooling and minimal heat generation occurs in the early periods of charge, followed by increasing heat generation as the state of charge of the cell increases. The discharge reaction produces the highest amount of heat, in the order Ni-H2>Ni-Cd>Ni-MH. This gradation in heat generation is due to reactions at the negative electrodes. There is also a gradation in thermoneutral potential, with the value for Ni-MH being close to its open-circuit potential
Keywords :
cadmium; calorimetry; electrochemical electrodes; electrochemistry; hydrogen; nickel; secondary cells; thermal analysis; Ni-Cd; Ni-H2; Ni-MH; cycling performance; discharge reaction; electrode properties; endothermic cooling; heat generation rate; negative electrodes; open-circuit potential; radiative-type calorimeter; secondary batteries; state of charge; thermoneutral potential; Batteries; Calorimetry; Cooling; Electric variables control; Electrodes; Space heating; Temperature control; Temperature sensors; Thermal management; Thermal variables control;
Conference_Titel :
Energy Conversion Engineering Conference, 1997. IECEC-97., Proceedings of the 32nd Intersociety
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-4515-0
DOI :
10.1109/IECEC.1997.659164
