Accession Number : ADA192816

Title :   Results from Life Test in Progress on Eagle-Picher Nickel Cadmium Cells.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA CHEMISTRY AND PHYSICS LAB

Personal Author(s) : Badcock, Charles C ; Donley, Samuel W ; Hwang, Warren G ; Matsumoto, James H ; Poston, Talmadge M

PDF Url : ADA192816

Report Date : 01 Apr 1988

Pagination or Media Count : 23

Abstract : This report summarizes the results from low-earth-orbit life testing on Eagle Picher nickel cadmium cells of nominal 50 Ah capacity that have been undergoing testing since 1983. As these cells have limited ability to withstand overcharge, a V-T charging scheme was adopted at the outset after careful determination of safe peak charge voltages at the two operating temperatures of 0 and 20 C. Of the original 30 cells put on life cycling under a complex load profile (10 cells each of 0 C/25% maximum depth-of-discharging (DOD), O C/40% maximum DOD, and 20 C/25% maximum DOD), both cell packs at 0 C were discontinued after less than 5000 pack at 20 C has exceeded 15,000 cycles (in May 1987), with no evidence of voltage spreading or other serious decline in performance. The original V-T level selected for this pack has not required adjustment. Keywords: Nickel, Cadmium, Batteries.

Descriptors :   *NICKEL CADMIUM BATTERIES, *LIFE EXPECTANCY(SERVICE LIFE), CADMIUM, ELECTRIC BATTERIES, LIFE TESTS, NICKEL, PERFORMANCE TESTS, ELECTROLYTES, VOLTAGE, FAILURE(ELECTRONICS), IMPEDANCE, ELECTRIC CHARGE, SPACECRAFT COMPONENTS

Subject Categories : Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE