Method and device for estimating remaining capacity of secondary cell battery pack system and electric vehicle
First Claim
1. A method for estimating a remaining capacity of a secondary battery, comprising the steps of:
- measuring data sets of a current flowing through a secondary battery and a terminal voltage of the secondary battery corresponding to the current, and obtaining a plurality of the data sets;
calculating an electromotive force of the secondary battery based on the obtained plurality of data sets;
determining a correction amount with respect to a current accumulation coefficient in accordance with the calculated electromotive force;
calculating the current accumulation coefficient from the correction amount and a charging efficiency; and
multiplying the calculated current accumulation coefficient by the measured current, and estimating a remaining capacity of the secondary battery by current accumulation.
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Abstract
There is provided a battery pack system with estimation accuracy of a remaining capacity of a secondary batter enhanced. A current accumulation coefficient correction section 109 calculates a correction amount α with respect to a current accumulation coefficient k in accordance with a battery electromotive force Veq from an electromotive force calculation section 105. A remaining capacity calculation section 112 estimates a remaining capacity SOC by current accumulation, based on the current accumulation coefficient k calculated from a correction amount α, and a charging efficiency η based on a currently estimated remaining capacity calculated by a charging efficiency calculation section 110.
52 Citations
8 Claims
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1. A method for estimating a remaining capacity of a secondary battery, comprising the steps of:
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measuring data sets of a current flowing through a secondary battery and a terminal voltage of the secondary battery corresponding to the current, and obtaining a plurality of the data sets;
calculating an electromotive force of the secondary battery based on the obtained plurality of data sets;
determining a correction amount with respect to a current accumulation coefficient in accordance with the calculated electromotive force;
calculating the current accumulation coefficient from the correction amount and a charging efficiency; and
multiplying the calculated current accumulation coefficient by the measured current, and estimating a remaining capacity of the secondary battery by current accumulation.
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2. A method for estimating a remaining capacity of a secondary battery, comprising the steps of:
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measuring data sets of a current flowing through a battery pack including a combination of a plurality of cells that are secondary batteries and used in an intermediately charged state and a terminal voltage of the secondary battery corresponding to the current, and obtaining a plurality of the data sets;
calculating an electromotive force of the secondary battery based on the obtained plurality of data sets;
determining a correction amount with respect to a current accumulation coefficient in accordance with the calculated electromotive force;
calculating the current accumulation coefficient from the correction amount and a charging efficiency; and
multiplying the calculated current accumulation coefficient by the measured current, and estimating a remaining capacity of the secondary battery by current accumulation. - View Dependent Claims (3, 4)
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5. An apparatus for estimating a remaining capacity of a secondary battery, comprising:
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a current measuring section for measuring a current flowing through a secondary battery as current data;
a voltage measuring section for measuring a terminal voltage of the secondary battery corresponding to the current as voltage data;
an electromotive force calculation section for calculating an electromotive force of the secondary battery based on a plurality of data sets of the current data from the current measuring section and the voltage data from the voltage measuring section;
a current accumulation coefficient correction section for determining a correction amount with respect to a current accumulation coefficient in accordance with the electromotive force from the electromotive force calculation section;
an adder for outputting the current accumulation coefficient from the correction amount from the current accumulation coefficient correction section and a charging efficiency; and
a remaining capacity estimation section for multiplying the current accumulation coefficient from the adder by the current data, and estimating a remaining capacity of the secondary battery by current accumulation.
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6. An apparatus for estimating a remaining capacity of a secondary battery, comprising:
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a current measuring section for measuring a current flowing through a battery pack having a combination of a plurality of cells that are secondary batteries and used in an intermediately charged state, as current data;
a voltage measuring section for measuring a terminal voltage of the secondary battery corresponding to the current as voltage data;
an electromotive force calculation section for calculating an electromotive force of the secondary battery based on a plurality of data sets of the current data from the current measuring section and the voltage data from the voltage measuring section;
a current accumulation coefficient correction section for determining a correction amount with respect to a current accumulation coefficient, in accordance with the electromotive force from the electromotive force calculation section;
an adder for outputting the current accumulation coefficient from the correction amount from the current accumulation coefficient correction section and a charging efficiency; and
a remaining capacity estimation section for multiplying the current accumulation coefficient from the adder by the current data, and estimating the remaining capacity of a secondary battery by current accumulation. - View Dependent Claims (7, 8)
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Specification