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Sealed Primary Lithium-Inorganic Electrolyte Cell.
Quarterly rept. no. 6, 1 Jun-31 Aug 75,
MALLORY (P R) AND CO INC BURLINGTON MASS LAB FOR PHYSICAL SCIENCE
Pagination or Media Count:
The voltage delay characteristics of the D cells after a storage of 3 months at 72C and test at -30C appeared to have improved as a result of increasing the electrode area by increasing the width of the Li anode from 1.5 inches to 1.75 inches and the partial discharge. The safe venting pressure, determined from the quantitative measurements of the cell pressure on external heating and shorting, was found to be less than 200 PSIG. Short circuiting and forced discharging were carried out with D cells having a low pressure vent. It was found that although the cell explosions from shorting were preventable by using a particular low pressure vent design this design was ineffective for forced overdischarge at currents of 0.5 and 0.25A. It is also important to note that the cell wall temperatures at which the cells exploded on overdischarge were only slightly above the ambient, viz 34 and 39C. Use of diode protection need to be considered since overdischarge of a cell may occur in a multicell battery during normal usage.
APPROVED FOR PUBLIC RELEASE