METHOD AND SYSTEM FOR ESTIMATING STATE OF HEALTH OF BATTERY SET
First Claim
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1. A method for estimating a State of Health (SOH) of a battery set, comprising:
- a measuring step, for repeatedly measuring a plurality of loop voltages of a plurality of battery cells of the battery set by a plurality of distinct discharge capacities of a predetermined sampling condition;
a discretization step, for statistical-distributed-calculating the loop voltages of the battery cells according to a standard deviation formula, to get a plurality of voltage standard deviations, wherein each of the voltage standard deviations corresponding to each of the battery cells;
a differential step, for getting a discrete curve according to the discharge capacities and the voltage standard deviations, to calculate a standard-deviation-trough-value of the discrete curve by using a differential formula; and
an estimating step, for calculating a rated discharge capacity of the battery set and a discharge quantity corresponding to the standard-deviation-trough-value according to a SOH calculating formula, to get the SOH of the battery set.
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Abstract
A method and a system for estimating the State of Health (SOH) of a battery set are disclosed. The method utilizes a discrete quantization algorithm to estimate the SOH of the battery set, wherein the voltage standard deviations are calculated according to the loop voltages of the battery cells, and comparing the rated discharge capacity with the voltage standard deviations for estimating the SOH of the battery set.
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Citations
13 Claims
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1. A method for estimating a State of Health (SOH) of a battery set, comprising:
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a measuring step, for repeatedly measuring a plurality of loop voltages of a plurality of battery cells of the battery set by a plurality of distinct discharge capacities of a predetermined sampling condition; a discretization step, for statistical-distributed-calculating the loop voltages of the battery cells according to a standard deviation formula, to get a plurality of voltage standard deviations, wherein each of the voltage standard deviations corresponding to each of the battery cells; a differential step, for getting a discrete curve according to the discharge capacities and the voltage standard deviations, to calculate a standard-deviation-trough-value of the discrete curve by using a differential formula; and an estimating step, for calculating a rated discharge capacity of the battery set and a discharge quantity corresponding to the standard-deviation-trough-value according to a SOH calculating formula, to get the SOH of the battery set. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. A system for estimating a State of Health (SOH) of a battery set, comprising:
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the battery set, including a plurality of battery cells; a voltage detecting circuit electrically connected to the battery set, the voltage detecting circuit repeatedly measures plurality of loop voltages of the battery cells of the battery set by a plurality of distinct discharge capacities of a predetermined sampling condition; a current detecting circuit electrically connected to the battery set, the current detecting circuit measures a discharge current of the battery set for calculating the discharge capacities; and an operating module electrically connected to the batter set, the operating module comprises; a discretization unit, which statistical-distributed-calculates the loop voltages of the battery cells according to a standard deviation formula, to get a plurality of voltage standard deviations, wherein each of the voltage standard deviations respectively corresponding to each of the battery cells; a differential unit, which gets a discrete curve according to the discharge capacities and the voltage standard deviations, to calculate a standard-deviation-trough-value of the discrete curve by using a differential formula; and a SOH calculating unit, which calculates a rated discharge capacity of the battery set and a discharge quantity corresponding to the standard-deviation-trough-value according to a SOH calculating formula, to get the SOH of the battery set. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification