An 80-kWh-class Telecommunications Backup System with Large-scale Nickel Metal Hydride Batteries
Conference: WTC - World Telecommunications Congress 2010 - Telecommunications: The Infrastructure for the 21st Century
09/13/2010 - 09/14/2010 at Vienna, Austria
Proceedings: WTC - World Telecommunications Congress 2010
Pages: 3Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Takahashi, Keita; Yamashita, Akira; Miyasaka, Akihiro; Saito, Keiichi; Shodai, Takahisa (Energy and Environment Systems Laboratories, NTT Corporation, Morinosato-Wakamiya, Atsugi, 243-0198, Kanagawa, Japan)
We developed an 80-kWh-class telecommunications backup system using 95-Ah large-scale nickel metal hydride batteries. The system consists of 20 series circuits in parallel, where one circuit has 40 nickel metal hydride cells, chargers, dischargers, and an electronic control unit, which monitors and controls the system and reports the status of the batteries and errors to the monitoring sites. A simultaneous charge of all batteries and a constant-power discharge was included in the design for stability.