Apparatus for detecting charged state of secondary battery
First Claim
1. An apparatus for detecting a charged state of a battery being mounted on a vehicle, the apparatus comprising:
- a data acquiring device configured to acquire a plurality of pairs of data consisting of current and voltage of the battery;
a stabilizing device configured to stabilize a polarized state of the battery;
a first calculating device configured to calculate a pseudo open-circuit voltage of the battery based on i) the pairs of data acquired in a state where the polarized state of the battery is stabilized and ii) an internal resistance of the battery calculated at a latest sampling time; and
a second calculating device configured to calculate, as the charged state, a state of charge based on the pseudo open-circuit voltage.
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Abstract
A charged state detecting apparatus for a secondary battery is provided, which can suppress deterioration in the accuracy of detecting a charged state, such as an SOC, the deterioration being caused by variation of a polarization state of a battery. The charged state detecting apparatus stabilizes an amount of polarization of the battery, stops power generation upon confirmation of the stabilization of the polarization amount, and sufficiently alters the current of the battery to sample a required number of data pairs of voltage and current of the battery. Using these data pairs, the charged state detecting apparatus detects a charged state, such as the SOC, of the battery.
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Citations
7 Claims
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1. An apparatus for detecting a charged state of a battery being mounted on a vehicle, the apparatus comprising:
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a data acquiring device configured to acquire a plurality of pairs of data consisting of current and voltage of the battery; a stabilizing device configured to stabilize a polarized state of the battery; a first calculating device configured to calculate a pseudo open-circuit voltage of the battery based on i) the pairs of data acquired in a state where the polarized state of the battery is stabilized and ii) an internal resistance of the battery calculated at a latest sampling time; and a second calculating device configured to calculate, as the charged state, a state of charge based on the pseudo open-circuit voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification