Title :
Long-life nickel-metal hydride batteries as a backup power supply for telecommunications system-prolongation of cell life and effect of thermal management
Author :
Asakura, Kaoru ; Hasui, Harumi ; Shimomura, Michio ; Hirai, Toshiro
Author_Institution :
NTT Telecommun. Energy Labs., Japan
Abstract :
We have developed a long-life nickel-metal hydride (Ni/MH) battery that has a lifetime of 15 years at 30°C and operates at temperatures from -10°C to 60°C. This performance was achieved by improving the Ni/MH cells and optimizing their charging. Optimizing the metal-hydride and electrolyte contents of the Ni/MH cells extended cell lifetime. Use of an intermittent charging method that inhibits cell degradation due to overcharging extended cell lifetime to three times that of cells charged using continuous trickle-charging. This battery has been used as the backup power source in optical network units (ONUs) of fiber-to-the-home (FTTH) networks and in the HUB power supplies of fiber-to-the-pole (FTTP) networks.
Keywords :
emergency power supply; nickel; optical fibre subscriber loops; secondary cells; telecommunication power supplies; -10 to 60 C; 15 year; FTTH; FTTP networks; HUB power supplies; Ni/MH battery; Ni/MH cells; backup power supply; cell life extension; charging optimization; fiber-to-the-home networks; fiber-to-the-pole networks; intermittent charging method; long-life nickel-metal hydride batteries; optical network units; telecommunications system; thermal management effect;
Conference_Titel :
Telecommunications Energy Conference, 2001. INTELEC 2001. Twenty-Third International
Conference_Location :
Edinburgh, UK
Print_ISBN :
0-85296-744-6
DOI :
10.1049/cp:20010669
