Title :
Very rapid recharging of large VRLA cells
Author_Institution :
Oterlikon Statioary Batteries Ltd., Aesch, Switzerland
Abstract :
The high rate charge behavior of 2V 1000 Ah VRLA cells, subsequent to a full 12 minute rate discharge, is described. Charging rates with current equal to I10, 3I10 and 7I10 were evaluated for their influence on cell and connector temperatures and gas evolution. The result show that high rate charging, at the 3I 10 rate, can restore the UPS autonomy time within 1 hour without excessive cell heating and gas emission. The thermal imaging of the cells during the discharge and charge event allowed to detect the sites of maximum heating and heat transfer effects
Keywords :
battery chargers; heat transfer; infrared imaging; lead acid batteries; telecommunication power supplies; thermal analysis; uninterruptible power supplies; 12 min; 2 V; Pb; Pb-acid secondary cells; UPS autonomy time; cell temperature; charging rates; connector temperature; gas evolution; heat transfer; high rate charge behavior; large VRLA cells; thermal imaging; very rapid recharging; Asia; Batteries; Connectors; Heat transfer; Life estimation; Life testing; Telecommunications; Temperature; Uninterruptible power systems; Voltage;
Conference_Titel :
Telecommunications Energy Conference, 2000. INTELEC. Twenty-second International
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-6407-4
DOI :
10.1109/INTLEC.2000.884332
