Patents Assigned to NTT Power and Building Facilities Inc.
  • Apparatus for managing a battery unit having storage batteries
    Patent number: 6014012
    Abstract: The voltages V of storage batteries Sa, Sb, . . . Sn are detected, and the voltage E of the battery unit 10 is detected. A defect in each storage battery is detected in accordance with the voltage V detected. An abnormal voltage of the battery unit 10 is detected in accordance with the voltage E detected. Further, the temperature T of the battery unit 10 is detected, on the basis of which the expiration of each storage battery is determined. The defect detected, the abnormal voltage detected, and the expiration determined are informed.
    Type: Grant
    Filed: March 10, 1999
    Date of Patent: January 11, 2000
    Assignee: NTT Power and Building Facilities Inc.
    Inventors: Tetsuro Murao, Tamotsu Motozu, Tomonobu Tsujikawa, Yuji Kawagoe