Accession Number : AD0850093

Title :   Diode Control Research.

Descriptive Note : Quarterly technical progress rept. no. 10, 1 Sep-1 Dec 68,

Corporate Author : MALLORY (P R) AND CO INC BURLINGTON MA LAB FOR PHYSICAL SCIENCE

Personal Author(s) : Ball, James V. ; Simons, Elliott S.

Report Date : DEC 1968

Pagination or Media Count : 35

Abstract : The five-cell, sealed, 12-Ampere-hour, stabistor-controlled spacecraft battery designed for cycling under a shortened or condensed synchronous orbit was assembled and given its initial tests in vacuum over a temperature range of 0 to 50C. Comparison of results of the initial battery tests with the design computations and pre-assembly tests of the stabistor and heat sink showed an unexpected discrepancy which may be related to the thermal capacity of the heat sink. A trimming adjustment of the heat sink was performed to reduce the diode peak voltage at the end of charge, and the eight month test was initiated. The heat sink used in this system represents a further refinement which calculations show will limit the voltage of each cell individually yet sum the power outputs of the diodes (when the cells reach full charge) as an indication that the battery is substantially charged. (Author)

Descriptors :   (*ALKALINE BATTERIES, PERFORMANCE(ENGINEERING)), (*SEMICONDUCTOR DIODES, VOLTAGE REGULATORS), STORAGE BATTERIES, SPACEBORNE, HEAT SINKS, CONTROL SYSTEMS, NICKEL, CADMIUM.

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE