Battery apparatus and method for monitoring battery state
First Claim
1. A method for evaluating characteristic of a secondary battery passing power to/from one or more electric devices mounted on a vehicle, the method comprising steps of:
- measuring the current and voltage of the secondary battery according to a plurality of frequencies generated by the one or more electric devices;
calculating impedance of the secondary battery from the measurement results; and
evaluating the battery characteristic of the secondary battery from the impedance calculated.
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Abstract
Motor generator (MG) is controlled via motor controller by MG control processor of CPU, so that voltage and current of battery is detected while changing frequency of state detection current flowing in the secondary battery. According to the detection results, impedance is calculated in the impedance calculation unit. Remaining mount is calculated from the impedance obtained and the battery characteristics stored in memory. Furthermore, remaining amount change correction unit adds integration current between impedance measurements to the remaining amount for correcting the remaining amount. Weighting coefficient is determined from the standard deviation based on the corrected value and the remaining amount and weighted mean is calculated in weighted mean unit. Next, the result of the remaining amount calculation is used to perform service life calculation and service life correction calculation, and weighted mean is calculated in the same way as the remaining amount.
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Citations
20 Claims
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1. A method for evaluating characteristic of a secondary battery passing power to/from one or more electric devices mounted on a vehicle, the method comprising steps of:
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measuring the current and voltage of the secondary battery according to a plurality of frequencies generated by the one or more electric devices;
calculating impedance of the secondary battery from the measurement results; and
evaluating the battery characteristic of the secondary battery from the impedance calculated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A secondary battery evaluation method for evaluating a secondary battery by calculating the impedance according to measurement results of current and voltage of the secondary battery and referencing the battery characteristic, the method comprising steps of:
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calculating the impedance while successively changing the frequency of the current flowing to the secondary battery;
calculating the remaining amount of the secondary battery from the impedance and the battery characteristic;
calculating a correction value of the remaining amount change according to an integration current of the secondary battery successively measured during impedance calculation; and
calculating the remaining amount of the secondary battery by averaging the remaining amount and the correction value. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A battery apparatus for evaluating battery characteristic of a secondary battery passing power to/from one or more electric devices mounted on a vehicle, comprising:
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control means for applying the state detection current by a plurality of frequencies generated by operation of the one or more electric devices to the secondary battery;
impedance calculation means for measuring current and voltage of the secondary battery based on the frequency and calculating the impedance of the secondary battery from the measurement results;
storage means containing characteristic relationship between the remaining amount and the impedance of the secondary battery; and
battery characteristic calculation means for evaluating the battery characteristic of the secondary battery for the impedance calculated according to the characteristic relationship. - View Dependent Claims (17)
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18. A battery apparatus comprising:
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a voltage/current detection unit for detecting voltage and current of a secondary battery;
a storage unit for storing battery characteristics of the secondary battery calculated in advance so as to be referenced; and
a CPU having an impedance calculation unit for calculating the impedance of the secondary battery from the detected voltage and current, a remaining amount calculation unit for calculating the remaining amount of the secondary battery according to the calculated impedance and the battery characteristics, a remaining amount change correction unit for correcting the remaining amount change according to an integration current of the secondary battery, a service life calculation unit for calculating the service life of the secondary battery according to the parasitic capacity calculated by the impedance calculation unit and the remaining amount calculated by the remaining amount calculation unit, and a service life change correction unit for correcting the service life change;
wherein the calculation results of the remaining amount calculation unit and the remaining amount change correction unit and/or the service life calculation unit and the service life change correction unit are subjected to weighted mean to obtain the remaining amount and/or the service life of the secondary battery. - View Dependent Claims (19, 20)
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Specification