Method and apparatus for determining deterioration of secondary battery, and power supply system therewith
First Claim
1. A method for estimating a deterioration level or a discharge capability of a battery by comparing an impedance of the battery with a predetermined allowable range thereof, the method comprising:
- measuring, via circuitry, a current and a voltage of the battery;
calculating, via the circuitry, an impedance Za of the battery from the measured current and the measured voltage and calculating a superimposed direct current (DC) component IDCa from the measured current; and
estimating, via the circuitry, an impedance Zb of the battery in a case when a reference direct current IDCb is superimposed, from the calculated impedance Za and the calculated superimposed DC component IDCa, based on a predetermined relational expression between a superimposed direct current IDC and an impedance Z so as to determine the deterioration level or the discharge capability of the battery.
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Accused Products
Abstract
A method for detecting SOC and SOH of a storage battery includes: calculating an SOC value of the storage battery with use of an SOC calculation unit based on a measured voltage value or a measured current value of the storage battery and calculating an SOH value of the storage battery with use of an SOH calculation unit based on the SOC value; further calculating a new SOC value with use of the SOC calculation unit based on the SOH value and calculating a new SOH value with use of the SOH calculation unit based on the new SOC value, these further calculations of SOC value and SOH value being repeated a prescribed n times of at least one so as to obtain an nth calculated SOC value and an nth calculated SOH value; outputting the nth calculated SOH value as an SOH output value and outputting the nth calculated SOH value as an SOC output value; and storing the SOH output value into a memory.
26 Citations
9 Claims
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1. A method for estimating a deterioration level or a discharge capability of a battery by comparing an impedance of the battery with a predetermined allowable range thereof, the method comprising:
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measuring, via circuitry, a current and a voltage of the battery; calculating, via the circuitry, an impedance Za of the battery from the measured current and the measured voltage and calculating a superimposed direct current (DC) component IDCa from the measured current; and estimating, via the circuitry, an impedance Zb of the battery in a case when a reference direct current IDCb is superimposed, from the calculated impedance Za and the calculated superimposed DC component IDCa, based on a predetermined relational expression between a superimposed direct current IDC and an impedance Z so as to determine the deterioration level or the discharge capability of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for estimating a deterioration level or a discharge capability of a battery based on an impedance of the battery, comprising:
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a current sensor for measuring a current of the battery; a voltage sensor for measuring a voltage of the battery; and a control unit configured to;
(i) receive the measured current and the measured voltage from the current sensor and the voltage sensor, respectively;
(ii) calculate an impedance Za of the battery from the measured current and the measured voltage and calculate a superimposed DC component IDCa from the measured current; and
(iii) estimate an impedance Zb of the battery in a case when a reference direct current IDCb is superimposed, from the calculated impedance Za and the calculated superimposed DC component IDCa, based on a predetermined relational expression between a superimposed direct current IDC and an impedance Z so as to determine the deterioration level or the discharge capability of the battery. - View Dependent Claims (9)
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Specification