STATE ESTIMATION DEVICE, ENERGY STORAGE MODULE, VEHICLE, AND STATE ESTIMATION METHOD
First Claim
1. A state estimation device that estimates a state of a plurality of energy storage devices, the state estimation device comprising:
- a voltage detecting unit configured to detect voltages of the energy storage devices, respectively; and
an estimating unit configured to estimate a charge amount difference between at least two of the energy storage devices,wherein at a reference time point T0 during constant current charging to the plurality of energy storage devices, in a case in which one of the two energy storage devices is a low-voltage energy storage device whose voltage is relatively low, and the other of the two energy storage devices is a high-voltage energy storage device whose voltage is relatively high, the estimating unit performs;
a specific voltage setting process for setting, as a specific voltage V0, a voltage of the low-voltage energy storage device detected by the voltage detecting unit at the reference time point T0;
a time obtaining process for obtaining a time point at which a voltage of the high-voltage energy storage device reaches the specific voltage V0; and
a charge amount difference estimating process for estimating the charge amount difference between the at least two energy storage devices based on the reference time point T0, the time point obtained in the time obtaining process, and a current flowing through the plurality of energy storage devices during the constant current charging.
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Abstract
A state estimation device includes: a voltage detecting unit that detects voltages of energy storage devices; and an estimating unit that estimates a charge amount difference between at least two of the energy storage devices. At a reference time point T0 during constant current charging, the estimating unit performs: specific voltage setting for setting, as a specific voltage V0, a voltage of a low-voltage energy storage device at the reference time point T0; time obtaining for obtaining a time point at which a voltage of a high-voltage energy storage device reaches the specific voltage V0; and charge amount difference estimating for estimating the charge amount difference between the at least two energy storage devices based on the reference time point T0, the time point obtained in the time obtaining process, and a current flowing through the plurality of energy storage devices during the constant current charging.
24 Citations
8 Claims
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1. A state estimation device that estimates a state of a plurality of energy storage devices, the state estimation device comprising:
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a voltage detecting unit configured to detect voltages of the energy storage devices, respectively; and an estimating unit configured to estimate a charge amount difference between at least two of the energy storage devices, wherein at a reference time point T0 during constant current charging to the plurality of energy storage devices, in a case in which one of the two energy storage devices is a low-voltage energy storage device whose voltage is relatively low, and the other of the two energy storage devices is a high-voltage energy storage device whose voltage is relatively high, the estimating unit performs; a specific voltage setting process for setting, as a specific voltage V0, a voltage of the low-voltage energy storage device detected by the voltage detecting unit at the reference time point T0; a time obtaining process for obtaining a time point at which a voltage of the high-voltage energy storage device reaches the specific voltage V0; and a charge amount difference estimating process for estimating the charge amount difference between the at least two energy storage devices based on the reference time point T0, the time point obtained in the time obtaining process, and a current flowing through the plurality of energy storage devices during the constant current charging. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A state estimation method for estimating a state of a plurality of energy storage devices, the method comprising:
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setting, at a reference time point T0 during constant current charging to the plurality of energy storage devices, a voltage of a low-voltage energy storage device as a specific voltage V0, wherein one of at least two of the plurality of energy storage devices is the low-voltage energy storage device whose voltage is relatively low and the other of the two energy storage devices is a high-voltage energy storage device whose voltage is relatively high; obtaining a time point at which a voltage of the high-voltage energy storage device reaches the specific voltage V0; and estimating a charge amount difference between the at least two energy storage devices based on the reference time point T0, the time point obtained in the time obtaining, and a current flowing through the plurality of energy storage devices during the constant current charging.
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Specification