Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1986-05-06
1988-05-03
Hickey, R. J.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 31, 320 37, 320 39, 320 22, H02J 700
Patent
active
047422890
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for the cyclical trickle charging of a chargeable battery intended for emergency operation, in which case the charging voltage used is the output voltage from a source of d.c. voltage providing a variable level of output voltage, said source of voltage being connected to the battery via a charging regulator.
Batteries of this kind are usually part of a group of batteries in which the number of batteries is determined by the number of Ampere-hours which need to be available when the regular mains electricity supply fails. When this occurs it is important for the battery to function in the intended manner. A further requirement is that the battery is fully charged and exhibits the specified battery voltage. If this is not the case the battery may suffer damage, or at any rate be impaired, within such a relatively short interval of time as one year.
The battery is trickle charged in order to keep it at a high level of readiness for emergency operation, and this takes place in a conventional manner by connecting a continuous charging voltage across the battery, by means of which the battery voltage is made to stay at the specified value. The battery will suffer damage in spite of such trickle charging, mainly for the reason that it is unable to operate in the manner for which it was constructed and dimensioned.
The object of the present invention is to make available a method of charging of the kind referred to by way of introduction which does not suffer from the aforementioned disadvantages. The way in which this is achieved is for charging to be executed from a starting mode in accordance with a cyclical charging program which is repeated until the battery has been found to be fully charged, whereupon a rest mode will occur during which the battery is not charged, but the battery voltage is measured continuously, whereupon the rest mode is interrupted immediately and the aforementioned charging program is re-started if it is noted in the course of measuring the voltage that the battery voltage has dropped below a first pre-determined value, whereupon, if the rest mode has lasted for a pre-determined interval of time, a discharging phase will be initiated which involves the battery being discharged in accordance with a discharging program during which the battery voltage is measured continuously, whereupon the discharging phase will be interrupted if it is noted in the course of measuring the voltage that the battery voltage has dropped below a second pre-determined value, whereupon, once the discharging phase has been interrupted or completed, the charging program will be re-started.
According to another characteristic feature of the invention charging is executed in such a way that charging from a starting mode is executed at a normal charging voltage for an interval of time (a) consisting of a single number of minutes, whereupon an assessment is made whether a considerably longer interval of time b in relation to the interval of time a, preferably a single number of days, has elapsed since the starting mode, whereupon, if this is not the case, a check is made during a measurement phase whilst the battery is subjected to load of whether the battery voltage drops below a certain value within a certain interval of time c of the same order of magnitude as, but shorter than the interval of time a, whereupon, if this is the case, charging takes place at an increased voltage for an interval of time d of the same order of magnitude as, but longer than the interval of time a, followed by charging at a normal charging voltage for an interval of time e of the same order of mgnitude as, but shorter than the interval of time a, whereupon the aforementioned assessment is made once more, whereupon, if the battery voltage does not drop below the aforementioned value within the aforementioned interval of time e, charging takes place at a normal charging voltage for an interval of time f consisting of a single number of hours, whereupon the charging cycle reverts to the point after
REFERENCES:
patent: 3500167 (1970-03-01), Applegate et al.
patent: 3886427 (1975-05-01), Long
patent: 4136310 (1979-01-01), Foster
patent: 4302714 (1981-11-01), Yefsky
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