Method of and apparatus for monitoring the state of charge of a

Details Method of and apparatus for monitoring the state of charge of a Method of and apparatus for monitoring the state of charge of a

1986-02-26

1987-06-30

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 48, 320 20, 320 32, H02J 704, H01M 1044

Patent

active

046773630

ABSTRACT:
A method of and an apparatus for monitoring the state of charge of a rechargeable battery are disclosed which use a reference value corresponding to a defined state of charge stored in a memory. During each battery charging and discharging cycle, the terminal voltage, the current and time are measured and are converted into energy delivered to the battery or by the battery depending on the direction of current flow. The actual state of charge is then calculated from the reference value stored. The characteristic terminal voltage curve during charging and discharging is used for minimizing the differences between the quantities measured and the actual state of charge of the battery so monitored by monitoring the rate of change in the terminal voltage during the charging and the discharging cycles, by determining, after a phase of a relatively steady and small rate of change in voltage, at least one point at which the rate of change in voltage is higher and by adjusting the actual state of charge determined at this point by coulometry to the predetermined reference value.

REFERENCES:
patent: 3895284 (1975-07-01), Schweizer
patent: 4194146 (1980-03-01), Patry et al.
patent: 4247812 (1981-01-01), Patry et al.
patent: 4307330 (1981-12-01), Belot
patent: 4392101 (1983-07-01), Saar et al.
patent: 4503378 (1985-03-01), Jones et al.

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