Long-term storage of nickel—hydrogen cells

✍ Scribed by H. Vaidyanathan

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 447 KB
• Volume: 22
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(88)80017-x

✦ Synopsis

Representative samples of nickel-hydrogen cells for the INTELSAT VI program were used to evaluate the effects of prolonged storage under passive conditions, such as open-circuit discharged at 0 "C, room temperature, and -20 "C, and under quasidynamic conditions such as top-off charge and trickle charge. Cell capacity declines when cells are stored open-circuit discharged at room temperature, and a second plateau occurs in the discharge curve. Capacity loss was 47% for a cell with hydrogen precharge and 24.5% for one with no hydrogen precharge. Capacity recovery was observed following top-off charge storage of cells which had exhibited faded capacity as a result of passive storage at room temperature. Cells stored either at -20 "C or on trickle charge maintained their capacity. At 0 "C storage, the capacity of all three cells under test was greater than 55 A h (which exceeds the required minimum of 44 A h) after 7 months.