METHOD OF ESTIMATION OF THE STATE OF CHARGE OF A BATTERY
1 Assignment
0 Petitions
Accused Products
Abstract
The method includes the simultaneous measurement of the current I, of the positive plate potential V+, and of the temperature T at the positive terminal of the battery, the determination of a temperature compensated value Vc+ of the positive plate potential and the use of the temperature compensated value Vc+ for estimation of the state of charge. This method is more particularly used for estimation of the state of charge of an alkaline battery having a NiOOH positive plate.
-
Citations
14 Claims
-
1-7. -7. (canceled)
-
8. A method of estimation of the state of charge of an alkaline battery having a predetermined nominal battery capacity Cn, and comprising a reference electrode and a NiOOH positive plate, said method comprising:
-
measuring the voltage between said positive plate and said reference electrode, said voltage being representative of the positive plate potential V+, and estimating the state of charge (SOC) as a function of said positive plate potential and of the battery current, wherein the method comprises; simultaneous measuring the battery current I, the positive plate potential V+ and the temperature T at a terminal of the battery, determining a temperature compensated value Vc+ of the positive plate potential as a function of the measured values of the positive plate potential V+, of the current I, of the temperature T and of the nominal battery capacity Cn, said estimation of the state of charge taking into account the temperature compensated value Vc+ of the positive plate potential.
-
-
9. The method according to claim 9, wherein said determination of the temperature compensated value Vc+ of the positive plate potential comprises the following steps:
determining a temperature coefficient ktsoc corresponding to at least one charge or discharge rate, calculating the compensated value Vc+ of the positive plate potential according to Vc+=V++(T−
T0)×
ktsoc, wherein T0 is a predetermined reference temperature.- View Dependent Claims (10, 11, 12, 13, 14)
Specification