State-of-charge estimating apparatus
First Claim
1. A state-of-charge estimating apparatus connected to a power storage apparatus, in which a plurality of batteries are connected, and configured to estimate a state of charge indicating a residual capacity of the power storage apparatus, the state-of-charge estimating apparatus comprising:
- a first arithmetic unit configured to calculate, as a first state-of-charge estimation value, a present value of a state-of-charge estimation value calculated based on a battery capacity, a last value of the state-of-charge estimation value, and an electric current flowing in and out between a current control apparatus, which controls charge and discharge amounts of the power storage apparatus, and the power storage apparatus;
a second arithmetic unit configured to calculate, during constant current control for charging the power storage apparatus with a constant current, as a present value of a second state-of-charge estimation value, a state-of-charge estimation value calculated based on an equivalent circuit model of the battery and a voltage of the battery and, on the other hand, calculate, during constant voltage control for charging the power storage apparatus with a constant voltage, as the second state-of-charge estimation value, a present value of a state-of-charge estimation value calculated taking into account a resistance change of the battery based on the equivalent circuit model of the battery and the voltage of the battery; and
a correction arithmetic unit configured to periodically correct the first state-of-charge estimation value with the second state-of-charge estimation value.
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Abstract
A state-of-charge estimating apparatus includes at least a first arithmetic unit configured to calculate, as a first estimation value, the present estimation value calculated based on a battery capacity, the last estimation value, and an electric current flowing in and out between a current control apparatus, which controls charge and discharge amounts of a power storage apparatus, and the power storage apparatus, and a second arithmetic unit configured to calculate, during constant current control, as the present value of a second estimation value, an estimation value calculated based on an equivalent circuit model of a battery and a voltage of the battery and, on the other hand, calculate, during constant voltage control, as the second estimation value, the present estimation value calculated taking into account a resistance change of the battery based on the equivalent circuit model of the battery and the voltage of the battery.
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Citations
8 Claims
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1. A state-of-charge estimating apparatus connected to a power storage apparatus, in which a plurality of batteries are connected, and configured to estimate a state of charge indicating a residual capacity of the power storage apparatus, the state-of-charge estimating apparatus comprising:
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a first arithmetic unit configured to calculate, as a first state-of-charge estimation value, a present value of a state-of-charge estimation value calculated based on a battery capacity, a last value of the state-of-charge estimation value, and an electric current flowing in and out between a current control apparatus, which controls charge and discharge amounts of the power storage apparatus, and the power storage apparatus; a second arithmetic unit configured to calculate, during constant current control for charging the power storage apparatus with a constant current, as a present value of a second state-of-charge estimation value, a state-of-charge estimation value calculated based on an equivalent circuit model of the battery and a voltage of the battery and, on the other hand, calculate, during constant voltage control for charging the power storage apparatus with a constant voltage, as the second state-of-charge estimation value, a present value of a state-of-charge estimation value calculated taking into account a resistance change of the battery based on the equivalent circuit model of the battery and the voltage of the battery; and a correction arithmetic unit configured to periodically correct the first state-of-charge estimation value with the second state-of-charge estimation value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification