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Battery monitoring
| Details |
Inventors: Szlenski, Marek;
Assignee: Nokia Mobile Phones Limited (Espoo, FI)
Primary Examiner: Nappi; Robert E.
Assistant Examiner: Toatley, Jr.; Gregory J.
Attorney, Agent or Firm: Perman & Green, LLP
A battery voltage course is estimated during the actual discharge. The battery voltage is registered at a plurality of different times, and parameters for describing the battery discharge course are determined locally for said times in response to the registered values and the associated times. The registered service life is determined on the basis of the battery discharge course, and the remaining service life may e.g. be the remaining standby time of a radio telephone. |
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DETAILED DESCRIPTION The invention provides a method enabling the voltage course of a battery to be estimated during discharge without prior knowledge of the parameters of the battery.
This is achieved by the method of the invention in that values representing the battery voltage are registered at a plurality of times, and that parameters for describing the battery discharge course are determined locally for said times in response to the registered values and the associated times.
This means that the battery discharge course may be determined on the basis of a plurality of measurement points.
The actual model of the battery discharge may hereby be made very simple, since it is not necessary to consider ageing, slowly varying temperature fluctuations, etc.
The method of the invention may be considered as a technique which simplifies a very complex algorithm, as the parameters of the algorithm, which vary with the temperature, ageing and other conditions, are determined numerically, without the actual, complex relations having to be studied.
The technique of the invention may be used universally (for all types of batteries), as the actual properties of the battery, such as capacity, are not included in the calculations.
It should finally be noted that the method is not affected by factors including that the battery has not been fully charged, that it is not discharged prior to recharging, etc.
In the preferred method of the invention for estimating the battery voltage, this is assumed to decrease as a power function with time t from an initial value.
The battery discharge is assumed to follow the voltage course V.
sub.
bat =.
PHI.
-.
xi.
.
alpha.
.
sup.
t, where .
PHI.
,.
xi.
and .
alpha.
are constants.
A time span before the battery voltage has decreased to a predetermined voltage level may be determined on the basis of the sensed values and the time span between the sensing times.
This time span may be determined as t=ln((.
PHI.
-V.
sub.
T)/.
xi.
)/ln.
alpha.
, where V.
sub.
T is the predetermined voltage level
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Electrical and Wave 
