Accession Number : AD0845341

Title :   Diode Control Research.

Descriptive Note : Quarterly technical progress rept. no. 9, 1 Jun-1 Sep 68,

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

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

Report Date : SEP 1968

Pagination or Media Count : 40

Abstract : A test plan and test stations have been devised for testing of four five-cell nickel-cadmium batteries with stabistor charge control in vacuum and over a temperature range of 0 to 50C. One feature of the test setup is a battery retaining test fixture which provides heat sinking, cell over-pressure indication, and cell restraint. Also, a simple timing circuit for incremental approximation of the varying discharge times of the synchronous orbit is described. This circuit, using all standard components, provides a 48 cycle eclipse with discharge times of 6 to 74 minutes. An analysis of heat transfer associated with a typical stabistor heat sink has been carried out to demonstrate that once 10 microns of vacuum is reached, further decreases in pressure have little effect on the heat transfer conditions. This results from the fact that the stabistor heat sink cooling is mainly by conduction to the satellite frame, and other modes of cooling (radiation and conduction to the gas present at low pressures) are insignificant by comparison. (Author)

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

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE