Method and device for checking a storage battery
Battery monitoring system
Electric monitoring method and apparatus for electric system of automotive vehicle Patent #: 4290109
ApplicationNo. 06/208097 filed on 11/18/1980
US Classes:320/116, SERIALLY CONNECTED BATTERIES OR CELLS320/134With battery or cell condition monitoring (e.g., for protection from overcharging, heating, etc.)
ExaminersPrimary: Pellinen, A. D.
Attorney, Agent or Firm
International ClassesG01R 31/36 (20060101)
H02J 7/00 (20060101)
G01R 31/00 (20060101)
Foreign Application Priority Data1980-06-28 GB
AbstractA microprocessor based electric vehicle traction battery monitoring system evaluates the state of charge, interfaces with a traction motor control system, and controls recharging. The state of charge is evaluated during the first part of discharge by integrating the current after compensating it for rate of discharge and during the last part of discharge by dividing the battery into sub-packs and evaluating the state of charge from the lowest sub-pack voltage compensated for polarization voltage. The charge storage capacity is also calculated from the lowest sub-pack voltage. The maximum traction motor current is progressively limited during the last part of discharge. During charging, the charge withdrawn is replaced while progressively reducing the charging current and the battery is then charged at a constant current until the rate of rise of the lowest sub-pack voltage falls below a fixed level.