Accession Number : AD0825660

Title :   DIODE CONTROL RESEARCH.

Descriptive Note : Quarterly progress rept. no. 6, 1 Sep-1 Dec 67,

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

Personal Author(s) : Ball, James V.

Report Date : DEC 1967

Pagination or Media Count : 46

Abstract : A breadboard prototype of the 12 Amp-hour sealed nickel-cadmium spacecraft battery with stabistor charge control was operated successfully at 0, 25, and 35C. Fifty consecutive ninety-minute cycles (35 minutes discharge, 55 minutes charge) were run at each temperature, with a 75% depth of discharge. A capacity test, consisting of a low rate charge followed by a C/2 discharge to 0.9 volt, was performed after each 50 cycles and showed that the actual usable capacity of the cell had diminished during cycling. In every case it was possible to restore the original cell capacity by reconditioning the cells. Charge tests were conducted on 20 Amp-hour silver-cadmium cells at charge rates pertinent to 75% and 40% depth-of-discharge conditions under the 120-minute cycle (35 minutes discharge, 85 minutes charge). Data are also presented on the results of charge tests of 25 amp-hour silver-zinc cells after a 40% depth-of-discharge. Results of the Phase B study of the application of stabistor charge control to aircraft batteries are presented. It was concluded that no theoretical barriers are present as far as charge rates of 55 and 110 amps are concerned.

Descriptors :   (*ALKALINE BATTERIES, CONTROL SYSTEMS), STORAGE BATTERIES, SPACEBORNE, AIRBORNE, SEMICONDUCTOR DIODES, ELECTRIC DISCHARGES, STABILIZATION, NICKEL, SILVER, CADMIUM, ZINC, CURRENT REGULATORS, VOLTAGE REGULATORS.

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE