Secondary battery system including an arrangement to determine a temporary increase in direct current resistance of the secondary battery
First Claim
1. The secondary battery system comprising:
- a battery controller which controls charge and discharge of a secondary battery;
a total controller which controls the entire system;
an ammeter which detects a charge current and a discharge current of the secondary battery;
a voltmeter which detects a voltage of the secondary battery, anddetermination means for obtaining a direct current resistance of the secondary battery at the time of charge and a direct current resistance of the secondary battery at the time of discharge on the basis of a current value and a voltage value detected by the ammeter and the voltmeter, to thereby determine a temporary increase in the direct current resistance of the secondary battery caused by charge and discharge with a current on the basis of a relation between the two obtained direct current resistances,wherein the determination means calculates a value of a ratio of the direct current resistance of the secondary battery at the time of the discharge to the direct current resistance of the secondary battery at the time of the charge (discharge resistance/charge resistance), and determines, when the calculated value of the ratio of the direct current resistances of the secondary battery decreases to be equal to or smaller than a predetermined value, the temporary increase in the direct current resistance of the secondary battery caused by the charge and discharge with a large current, andthe total controller outputs, when the determination means determines the temporary increase in the direct current resistance of the secondary battery, a signal for stopping a use of the secondary battery for a given period via the battery controller, to thereby suspend the charge and discharge of the secondary battery.
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Accused Products
Abstract
Provided is a secondary battery system including: a battery controller which controls charge and discharge of a secondary battery; a total controller which controls the entire system; an ammeter which detects a charge current and a discharge current of the secondary battery; and a voltmeter which detects a voltage of the secondary battery, in which a direct current resistance of the secondary battery at the time of charge and a direct current resistance of the secondary battery at the time of discharge are obtained on the basis of a current value and a voltage value detected by the ammeter and the voltmeter, to thereby determine a temporary increase in the direct current resistance of the secondary battery caused by charge and discharge with a large current on the basis of a relation between the two obtained direct current resistances. Accordingly, in a secondary battery system used in a hybrid system, a wind power generating system, a photovoltaic power generating system, and the like, the situation where a direct current resistance thereof transitionally (temporarily) increases is simply detected on the basis of the usage situation of a secondary battery, to thereby accurately calculate the deterioration state of the secondary battery and thus enable an appropriate coping process, so that the life of the secondary battery can be extended.
7 Citations
10 Claims
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1. The secondary battery system comprising:
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a battery controller which controls charge and discharge of a secondary battery; a total controller which controls the entire system; an ammeter which detects a charge current and a discharge current of the secondary battery; a voltmeter which detects a voltage of the secondary battery, and determination means for obtaining a direct current resistance of the secondary battery at the time of charge and a direct current resistance of the secondary battery at the time of discharge on the basis of a current value and a voltage value detected by the ammeter and the voltmeter, to thereby determine a temporary increase in the direct current resistance of the secondary battery caused by charge and discharge with a current on the basis of a relation between the two obtained direct current resistances, wherein the determination means calculates a value of a ratio of the direct current resistance of the secondary battery at the time of the discharge to the direct current resistance of the secondary battery at the time of the charge (discharge resistance/charge resistance), and determines, when the calculated value of the ratio of the direct current resistances of the secondary battery decreases to be equal to or smaller than a predetermined value, the temporary increase in the direct current resistance of the secondary battery caused by the charge and discharge with a large current, and the total controller outputs, when the determination means determines the temporary increase in the direct current resistance of the secondary battery, a signal for stopping a use of the secondary battery for a given period via the battery controller, to thereby suspend the charge and discharge of the secondary battery. - View Dependent Claims (2, 3, 4, 5)
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6. The secondary battery system comprising:
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a battery controller which controls charge and discharge of a secondary battery; a total controller which controls the entire system; an ammeter which detects a charge current and a discharge current of the secondary battery; a voltmeter which detects a voltage of the secondary battery, and determination means for obtaining a direct current resistance of the secondary battery at the time of charge and a direct current resistance of the secondary battery at the time of discharge on the basis of a current value and a voltage value detected by the ammeter and the voltmeter, to thereby determine a temporary increase in the direct current resistance of the secondary battery caused by charge and discharge with a current on the basis of a relation between the two obtained direct current resistances, wherein the determination means calculates a difference between a rate of increase of the direct current resistance of the secondary battery at the time of the discharge and a rate of increase of the direct current resistance of the secondary battery at the time of the charge, and determines, when the calculated difference becomes a negative value equal to or smaller than a predetermined value, the temporary increase in the direct current resistance of the secondary battery caused by the charge and discharge with a large current, and the total controller outputs, when the determination means determines the temporary increase in the direct current resistance of the secondary battery, a signal for stopping a use of the secondary battery for a given period via the battery controller, to thereby suspend the charge and discharge of the secondary battery.
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7. The secondary battery system comprising:
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a battery controller which controls charge and discharge of a secondary battery; a total controller which controls the entire system; an ammeter which detects a charge current and a discharge current of the secondary battery; a voltmeter which detects a voltage of the secondary battery, and determination means for obtaining a direct current resistance of the secondary battery at the time of charge and a direct current resistance of the secondary battery at the time of discharge on the basis of a current value and a voltage value detected by the ammeter and the voltmeter, to thereby determine a temporary increase in the direct current resistance of the secondary battery caused by charge and discharge with a current on the basis of a relation between the two obtained direct current resistances, wherein the secondary battery system is a hybrid system comprising an engine, an electric power generator, a motor, a secondary battery, a battery controller which controls charge and discharge of the secondary battery, and a total controller which controls the entire system, and the total controller outputs, when the determination means determines the temporary increase in the direct current resistance of the secondary battery caused by the charge and discharge with a large current, a signal for stopping a use of the secondary battery for a given period via the battery controller, to thereby suspend the charge and discharge of the secondary battery. - View Dependent Claims (8, 9)
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10. The secondary battery system comprising:
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a battery controller which controls charge and discharge of a secondary battery; a total controller which controls the entire system; an ammeter which detects a charge current and a discharge current of the secondary battery; a voltmeter which detects a voltage of the secondary battery, and determination means for obtaining a direct current resistance of the secondary battery at the time of charge and a direct current resistance of the secondary battery at the time of discharge on the basis of a current value and a voltage value detected by the ammeter and the voltmeter, to thereby determine a temporary increase in the direct current resistance of the secondary battery caused by charge and discharge with a current on the basis of a relation between the two obtained direct current resistances, wherein the secondary battery system is an electric power generating system comprising;
an electric power generating unit which utilizes natural energy;
a secondary battery;
a battery controller which controls charge and discharge of the secondary battery; and
a total controller which controls the entire system, andthe total controller outputs, when the determination means determines the temporary increase in the direct current resistance of the secondary battery caused by the charge and discharge with a large current, a signal for stopping a use of the secondary battery for a given period via the battery controller, to thereby suspend the charge and discharge of the secondary battery.
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Specification