Failure Mechanisms in Sealed Batteries.
Final technical rept. 1 Jul 66-30 Apr 69,
BATTELLE MEMORIAL INST COLUMBUS OH COLUMBUS LABS
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Results of a continuing orbital test of sealed nickel-cadmium cells are presented. After three eclipse seasons, three of the four original groups of cells are still operating satisfactorily. Failure analysis procedures were developed for nickel-cadmium and silver-zinc cells. These procedures have been used to deduce failure determinants for cells which failed during orbital testing programs. The results of failure analyses coupled with the results of analyses of uncycled cells have yielded information about the increase in carbonate concentration in the electrolyte during cell operation. Thermal studies have developed mathematical and physical models for predicting cell thermal properties. A discussion of efficient cell and battery design is given. Chemical analyses have been made on electrolytes containing KOH, K2CO3, ZnO, and Ag2O. The interaction of these components in the electrolyte is discussed. Measurements of electrolyte conductivity and freezing points of these solutions have also been made. The empirical, statistical and physical approaches to accelerated life testing are reviewed. An accelerated test is discussed in terms of stress-strain relationships. Author
- Electrochemical Energy Storage