Battery state judging apparatus

Details Battery state judging apparatus Battery state judging apparatus

1994-11-18

1997-02-25

Nappi, Robert

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 2, G01R 3136

Patent

active

056062435

ABSTRACT:
A battery state judging apparatus comprising a voltage detector detecting a voltage at a terminal of a battery, a current detector detecting a charge/discharge current of the battery and an arithmetic operation circuit calculating a residual capacity index of the battery relating to a value obtained by subtracting a quantity of electric charge from a reference capacity value of the battery and calculating a power consumption of the battery from the detected terminal voltage and charge/discharge current. The arithmetic operation circuit estimates a charge/discharge current as a function of the battery residual capacity index and battery power consumption and successively estimates a charge/discharge current in a predetermined power consumption pattern to successively calculate a battery residual capacity index from the estimated charge/discharge current. A battery operable threshold is judged when a battery discharge current, estimated on the basis of an updated battery residual capacity index exceeds a threshold current at that power consumption, and a result is displayed via a display circuit.

REFERENCES:
patent: 5321627 (1994-06-01), Reher
patent: 5325041 (1994-07-01), Briggs
patent: 5349535 (1994-09-01), Gupta
patent: 5352982 (1994-10-01), Nakazawa et al.
patent: 5394089 (1995-02-01), Clegg
patent: 5479085 (1995-12-01), Honda et al.
patent: 5487002 (1996-01-01), Diller et al.

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