Charging of vehicle battery based on indicators of impedance and health
First Claim
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1. A vehicle comprising:
- a battery; and
at least one controller configured toselect a charge voltage and maximum current for the battery based on a rate of change of an impedance parameter of the battery indicative of battery age such that as the rate of change increases the selected charge voltage increases,charge the battery at the selected charge voltage,detect a sulphation condition of the battery based on a value of the impedance parameter falling within a predefined range of impedance parameter values, a value of a first health term of the battery, Health_Term_1, being less than a predefined range of first health term values, and a value of a second health term of the battery, Health_Term_2, being less than a predefined range of second health term values, andin response to the sulphation condition, increase the selected charge voltage.
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Abstract
A method for charging a battery may include determining a degradation condition of the battery based on impedance parameters of the battery, altering a default charge profile for the battery based on the degradation condition, and charging the battery with the altered charge profile.
35 Citations
9 Claims
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1. A vehicle comprising:
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a battery; and at least one controller configured to select a charge voltage and maximum current for the battery based on a rate of change of an impedance parameter of the battery indicative of battery age such that as the rate of change increases the selected charge voltage increases, charge the battery at the selected charge voltage, detect a sulphation condition of the battery based on a value of the impedance parameter falling within a predefined range of impedance parameter values, a value of a first health term of the battery, Health_Term_1, being less than a predefined range of first health term values, and a value of a second health term of the battery, Health_Term_2, being less than a predefined range of second health term values, and in response to the sulphation condition, increase the selected charge voltage. - View Dependent Claims (2, 3)
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4. A method for charging a battery comprising:
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selecting a charge voltage and maximum current for the battery based on a rate of change of an impedance parameter of the battery indicative of battery age such that as the rate of change increases the selected charge voltage increases; charging the battery at the selected charge voltage; detecting a shorted cell condition of the battery based on a value of the impedance parameter falling within a predefined range of impedance parameter values a value of a first health term of the battery, Health_Term_1, being less than a predefined range of first health term values, and a value of a second health term of the battery, Health_Term_2, falling within a predefined range of second health term values; and in response to the shorted cell condition, decreasing the selected charge voltage. - View Dependent Claims (5, 6)
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7. A vehicle comprising:
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a battery; and at least one controller configured to select a set point voltage and set point current for the battery based on a rate of change of an impedance parameter of the battery indicative of battery age such that as the rate of change increases the set point voltage and set point current increases, charge the battery at the set points, detect a dry out condition of the battery based on a value of the impedance parameter being less than a predefined range of impedance parameter values, a value of a first health term of the battery, Health_Term_1, falling within a predefined range of first health term values, and a value of a second health term of the battery, Health_Term_2, falling within a predefined range of second health term values, and in response to the dry out condition, increase the set point voltage. - View Dependent Claims (8, 9)
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Specification