Title :
Field trial on a rack-mounted DC power-supply system using an 80-Ah lithium-ion backup battery
Author :
Matsushima, Toshio ; Suzuki, Nobuhiko
Author_Institution :
NTT Facilities R&D Headquarters, Tokyo
Abstract :
Using an industrial lithium-ion battery that has higher energy density than conventional valve-regulated lead-acid batteries, a rack-mounted DC-power-supply system was assembled and tested at a base transceiver station (BTS) during actual service. The nominal output voltage of the system is 53.5 V and the maximum output current is 20 A. An 80-Ah lithium-ion battery composed of 13 cells connected in series was used and maintained by the floating charge method. The DC-power-supply system was installed in a 19-inch power rack in the telecommunications equipment box at the BTS. The characteristics of the 80-Ah lithium-ion battery, specifications of the DC-power-supply system and field-test results are presented here.
Keywords :
emergency power supply; lead acid batteries; secondary cells; telecommunication equipment; telecommunication power supplies; transceivers; Li; Pb; base transceiver station; current 20 A; energy density; floating charge method; industrial lithium-ion battery; lithium-ion backup battery; rack-mounted DC power-supply system; telecommunications equipment box; valve-regulated lead-acid batteries; voltage 53.5 V; Assembly systems; Base stations; Batteries; Electricity supply industry; Emergency power supplies; Portable computers; Power supplies; Research and development; System testing; Voltage; DC-power-supply system; cell-voltage-equalizing circuit; float charge; lithium-ion cell;
Conference_Titel :
Telecommunications Energy Conference, 2008. INTELEC 2008. IEEE 30th International
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-2055-1
Electronic_ISBN :
978-1-4244-2056-8
DOI :
10.1109/INTLEC.2008.4664123
