Accession Number : AD0697938

Title :   ANALYSIS AND EVALUATION OF SPACECRAFT BATTERY LIFE TEST DATA (PHASE 2).

Descriptive Note : Summary rept.,

Corporate Author : NAVAL AMMUNITION DEPOT CRANE IND QUALITY EVALUATION LAB

Personal Author(s) : Kent,J. R.

Report Date : 17 OCT 1969

Pagination or Media Count : 110

Abstract : The report presents the findings from the mathematical/statistical analysis of data generated by life tests on 660 nickel-cadmium spacecraft battery cells. Three major objectives of the analysis were to: (1) determine the reliability of methods of predicting the useful life of the cells, (2) determine the statistical meaning of data collected during present acceptance testing and whether the acceptance data can be used in making life predictions, and (3) determine if particular failure characteristics or combinations thereof could be related to specific environmental factors. Results of the analysis indicate: (1) about 85% accuracy in predicting the useful life of a cell, (2) the addition of acceptance data to the prediction model is of little value, and (3) failure characteristics were found to be highly correlated with specific environmental factors in several instances. (Author)

Descriptors :   (*ALKALINE BATTERIES, RELIABILITY(ELECTRONICS)), NICKEL, CADMIUM, LIFE EXPECTANCY, PREDICTIONS, STATISTICAL ANALYSIS, FAILURE(ELECTRONICS), SPACEBORNE

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE