Process for determining the state of charge and the peak current loadability of batteries
First Claim
1. A process for determining the state of charge and peak current loadability of a battery comprising:
- measuring no-load voltages U01 and U02 in currentless pauses before and after a load phase;
calculating true battery rest voltages U001 and U002 from said no-load voltages U01 and U02 for battery specific parameters, including the time curve of the no-load voltage;
measuring the converted current quantity q, wherein q is the amount of capacity discharged during the loading phase;
determining the acid capacity Q10 of the battery from the formula U002 -U001 =C1 ·
q/Q0 ;
determining the relative state of charge SOC1 from a curve of the rest voltage U00 linearized by the formula SOC1 =U002 /C1 -C2 as a function of the state of charge of the battery; and
calculating the absolute state of charge as SOC1 ·
Q0, wherein C1 is a constant voltage and C2 is a constant, both C1 and C2 depending on the number of cells in the battery.
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Abstract
In a process for determining the state of charge and the peak current loadability of batteries in the currentless pauses before and after a loading phase the no-load voltages U01 and U02 are measured. From them, with allowance for battery-specific parameters, especially the time curve of the no-load voltage, the true battery rest voltages U001 and U002 are computed. During the loading phase the converted current quantity q is measured and from the relationship U002 -U001 =C1 ·q/Q0 the acid capacity Q0 of the battery is found. The relative state of charge SOC1 is determined from a curve of the rest voltage U00 linearized by the formula SOC1 =U002 /C1 -C2 as a function of the state of charge of the battery from which the absolute state of charge is calculated as SOC1 ·Q0.
From the internal resistance R1, a preassigned temperature and the last determined state of charge, a rest voltage is predicted for a later time from which, with the current necessary for starting the engine known, a pronouncement can be derived concerning the starting capacity of the battery.
33 Citations
8 Claims
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1. A process for determining the state of charge and peak current loadability of a battery comprising:
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measuring no-load voltages U01 and U02 in currentless pauses before and after a load phase; calculating true battery rest voltages U001 and U002 from said no-load voltages U01 and U02 for battery specific parameters, including the time curve of the no-load voltage; measuring the converted current quantity q, wherein q is the amount of capacity discharged during the loading phase; determining the acid capacity Q10 of the battery from the formula U002 -U001 =C1 ·
q/Q0 ;determining the relative state of charge SOC1 from a curve of the rest voltage U00 linearized by the formula SOC1 =U002 /C1 -C2 as a function of the state of charge of the battery; and calculating the absolute state of charge as SOC1 ·
Q0, wherein C1 is a constant voltage and C2 is a constant, both C1 and C2 depending on the number of cells in the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification