Method of estimation of the state of charge of a battery
First Claim
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1. A method of estimation of a state of charge of an alkaline battery having a predetermined nominal battery capacity C.sub.n, and comprising a reference electrode and a NiOOH positive plate, said method comprising:
- measuring a voltage between said positive plate and said reference electrode, said voltage being representative of the positive plate potential V.sub.+, and estimating the state of charge (SOC) as a function of said positive plate potential and of a battery current, wherein the method comprises;
simultaneous measuring the battery current I, the positive plate potential V.sub.+ and a temperature T at a terminal of the battery, determining a temperature compensated value V.sub.c+ of the positive plate potential as a function of the measured values of the positive plate potential V.sub.+, of the current I, of the temperature T and of the nominal battery capacity C.sub.n, said estimation of the state of charge taking into account the temperature compensated value V.sub.c+ of the positive plate potential, wherein said determination of the temperature compensated value V.sub.c+ of the positive plate potential comprises the following steps;
determining a temperature coefficient k.sub.tsoc corresponding to at least one charge or discharge rate, calculating the compensated value V.sub.c+ of the positive plate potential according to V.sub.c+=V.sub.++(T−
T.sub.0).times.k.sub.tsoc, wherein T.sub.0 is a predetermined reference temperature.
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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.
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6 Claims
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1. A method of estimation of a state of charge of an alkaline battery having a predetermined nominal battery capacity C.sub.n, and comprising a reference electrode and a NiOOH positive plate, said method comprising:
- measuring a voltage between said positive plate and said reference electrode, said voltage being representative of the positive plate potential V.sub.+, and estimating the state of charge (SOC) as a function of said positive plate potential and of a battery current, wherein the method comprises;
simultaneous measuring the battery current I, the positive plate potential V.sub.+ and a temperature T at a terminal of the battery, determining a temperature compensated value V.sub.c+ of the positive plate potential as a function of the measured values of the positive plate potential V.sub.+, of the current I, of the temperature T and of the nominal battery capacity C.sub.n, said estimation of the state of charge taking into account the temperature compensated value V.sub.c+ of the positive plate potential, wherein said determination of the temperature compensated value V.sub.c+ of the positive plate potential comprises the following steps;
determining a temperature coefficient k.sub.tsoc corresponding to at least one charge or discharge rate, calculating the compensated value V.sub.c+ of the positive plate potential according to V.sub.c+=V.sub.++(T−
T.sub.0).times.k.sub.tsoc, wherein T.sub.0 is a predetermined reference temperature. - View Dependent Claims (2, 3, 4, 5, 6)
- measuring a voltage between said positive plate and said reference electrode, said voltage being representative of the positive plate potential V.sub.+, and estimating the state of charge (SOC) as a function of said positive plate potential and of a battery current, wherein the method comprises;
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