Electricity: measuring and testing – Determining nonelectric properties by measuring electric...
Patent
1987-06-25
1989-11-14
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
204401, 204421, 324434, 324522, 324537, 429 91, G01N 2700
Patent
active
048810266
ABSTRACT:
Disclosed is a method and apparatus which can detect progress of degradation of a sodium-sulfur cell and predict possibility of final breakdown of the cell in a very near future before such a final breakdown of the cell actually occurs. The method and apparatus for diagnosing the presence or absence of an abnormal state in the sodium-sulfur cell, containing a porous electrical conductive material impregnated with molten sulfur or sodium polysulfide as its positive electrode reactant and containing sodium as its negative electrode reactant, comprises observing the operating voltage of the cell during charging and discharging so as to detect occurrence of a minute ripple in the operating voltage, and, when the amplitude of the ripple and the frequency of occurrence of the ripple increases as a result of repeated cycles of charging and discharging, deciding that degradation of the cell has progressed to an extent that final breakdown of the cell will occur in a very near future.
REFERENCES:
patent: 3519842 (1970-07-01), Furuishi
patent: 3661748 (1972-05-01), Blackmer
patent: 4368423 (1983-01-01), Liburdy
patent: 4578325 (1986-03-01), Gotou et al.
patent: 4590430 (1986-05-01), Vandenberghe et al.
Journal of Power Sources, vol. 17, Nos. 1-3, Jan.-Apr. 1981, pp. 228-235: M. Wada et al.: "In-test and post-text analyses of sodium-sulfur cells" p. 203; p. 232 paragraph 4, Cell voltage fluctuation.
Hatoh Hisamitu
Ishida Yasumasa
Kawamoto Hiroyuki
Miyatake Yoshiteru
Mori Sadao
Eisenzopf Reinhard J.
Hitachi , Ltd.
Mueller Robert W.
The Tokyo Electric Power Co., Ltd.
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