Battery state estimating device and battery state estimating method
First Claim
1. A battery state estimating device for estimating a battery state of a secondary battery, the device comprising:
- a current sensor configured to detect a current flowing through the secondary battery;
a voltage sensor configured to detect a terminal voltage of the secondary battery;
a current detecting control unit configured to determine a measured current value based on the current detected by the current sensor;
a voltage detecting control unit configured to determine a measured voltage value based on the terminal voltage detected by the voltage sensor;
an identification calculation control unit configured to;
estimate a terminal voltage of the secondary battery, which is based on a battery model of the secondary battery, as an estimated voltage value on the basis of the measured current value and the measured voltage value with the battery model defined as shown in Formula (17) where the measured voltage value is V, the measured current value is I, s is a differential operator, and A(s) and B(s) are polynomial functions of the differential operator s, andperform a sequential identification calculation of sequentially identifying parameters of the battery model in such a way that a difference between a value based on the measured voltage value and the estimated voltage value converges to zero; and
a limit processing control unit configured to;
determine whether, among the parameters identified by the identification calculation control unit, a highest-degree term parameter corresponding to a coefficient of a term with the highest degree in a polynomial s·
A(s) of the Formula (17) is equal to or larger than a predetermined first threshold,perform upper limit processing of setting a value of the highest-degree term parameter to the first threshold when the highest-degree term parameter is equal to or larger than the first threshold, andestimate a state of the secondary battery using the highest-degree term parameter after performing the upper limit processing
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Abstract
A battery state estimating device being one aspect of the present invention detects a current and a terminal voltage of a secondary battery, estimates a terminal voltage of the secondary battery which is based on a predetermined battery model by using measured values I(k) and V(k) respectively of the detected current and the detected terminal voltage, and sequentially identifies a parameter φ^(k) of the battery model in such a way that the difference between a value based on the measured value of the terminal voltage and an estimate value of the terminal voltage converges to zero. Then, when a certain parameter φn in the identified parameter is equal to or larger than a predetermined first threshold δ1, the battery state estimating device performs upper limit processing of setting the value of the certain parameter φn to the first threshold δ1.
18 Citations
18 Claims
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1. A battery state estimating device for estimating a battery state of a secondary battery, the device comprising:
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a current sensor configured to detect a current flowing through the secondary battery; a voltage sensor configured to detect a terminal voltage of the secondary battery; a current detecting control unit configured to determine a measured current value based on the current detected by the current sensor; a voltage detecting control unit configured to determine a measured voltage value based on the terminal voltage detected by the voltage sensor; an identification calculation control unit configured to; estimate a terminal voltage of the secondary battery, which is based on a battery model of the secondary battery, as an estimated voltage value on the basis of the measured current value and the measured voltage value with the battery model defined as shown in Formula (17) where the measured voltage value is V, the measured current value is I, s is a differential operator, and A(s) and B(s) are polynomial functions of the differential operator s, and perform a sequential identification calculation of sequentially identifying parameters of the battery model in such a way that a difference between a value based on the measured voltage value and the estimated voltage value converges to zero; and a limit processing control unit configured to; determine whether, among the parameters identified by the identification calculation control unit, a highest-degree term parameter corresponding to a coefficient of a term with the highest degree in a polynomial s·
A(s) of the Formula (17) is equal to or larger than a predetermined first threshold,perform upper limit processing of setting a value of the highest-degree term parameter to the first threshold when the highest-degree term parameter is equal to or larger than the first threshold, and estimate a state of the secondary battery using the highest-degree term parameter after performing the upper limit processing - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 18)
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9. A method for estimating a state of a battery comprising:
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sensing a current flowing through a secondary battery; sensing a terminal voltage of the secondary battery; determining a measured current value based on the current sensed; determining a measured voltage value based on the terminal voltage sensed; estimating a terminal voltage of the secondary battery which is based on a battery model of the secondary battery, as an estimated voltage value on the basis of the measured current value and the measured voltage value, with the battery model defined as shown in the Formula (18) where the measured voltage value is V, the measured current value is I, s is a differential operator, and A(s) and B(s) are polynomial functions of the differential operator s; sequentially identifying parameters of the battery model in such a way that a difference between a value based on the measured voltage value and the estimated voltage value converges to zero; determining whether, among the identified parameters, a highest-degree term parameter corresponding to a coefficient of a term with the highest degree in a polynomial s·
A(s) of the Formula (18) is equal to or larger than a predetermined first threshold;performing upper limit processing of setting a value of the highest-degree term parameter to the first threshold when the highest-degree term parameter is equal to or larger than the first threshold; and estimating a state of the secondary battery using the highest-degree term parameter after performing the upper limit processing - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A battery state estimating device comprising:
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current sensing means for sensing a current flowing through a secondary battery; voltage sensing means for sensing a terminal voltage of the secondary battery; current detecting means for determining a measured current value based on the current sensed by the current sensing means; voltage detecting means for determining a measured voltage value based on the terminal voltage sensed by the voltage sensing means; identification calculation means for; estimating a terminal voltage of the secondary battery, which is based on a battery model of the secondary battery, as an estimated voltage value on the basis of the measured current value and the measured voltage value with the battery model defined as shown in Formula (19) where the measured voltage value is V, the measured current value is I, s is a differential operator, and A(s) and B(s) are polynomial functions of the differential operator s, and performing a sequential identification calculation of sequentially identifying parameters of the battery model in such a way that a difference between a value based on the measured voltage value and the estimated voltage value converges to zero; and limit processing means for; determining whether, among the parameters identified, a highest-degree term parameter corresponding to a coefficient of a term with the highest degree in a polynomial s·
A(s) of the Formula (19) is equal to or larger than a predetermined first threshold,performing upper limit processing of setting a value of the highest-degree term parameter to the first threshold when the highest-degree term parameter is equal to or larger than the first threshold, and estimating a state of the secondary battery using the highest-degree term parameter after performing the upper limit processing
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Specification