Device for determining the charge condition of a battery

Details Device for determining the charge condition of a battery Device for determining the charge condition of a battery

1990-11-13

1992-09-01

Hickey, R. J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 48, H02J 704

Patent

active

051442183

ABSTRACT:
A device for determining the charge condition of a battery (10) comprises a current-frequency converter (50) which generates pulses of a frequency is dependent on the battery charge or discharge current. These pulses are counted and are used for computing the battery charge condition. In order to indicate a correct relative charge condition, especially in the case of a battery capacity which has changed due to, for example, ageing, the device comprises detection means (53) which detects an actual battery charge condition and correction means (52) for correcting the charge condition computed by a computing means (51). In one embodiment the correction means are integrated with the current-frequency converter and the frequency of the generated pulses is adapted to the present capacity of the battery.

REFERENCES:
patent: 4194146 (1980-03-01), Patry et al.
patent: 4307330 (1981-12-01), Belot
patent: 4677363 (1987-06-01), Kopmann
patent: 4743831 (1988-05-01), Young
patent: 4775827 (1988-10-01), Ijntema et al.
patent: 5043651 (1991-08-01), Tamura

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