DYNAMICALLY ADAPTIVE METHOD FOR DETERMINING THE STATE OF CHARGE OF A BATTERY
First Claim
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1. A method for determining state of charge (SOC) of a battery, the method comprising:
- obtaining sampled terminal voltage data for a lithium ion battery, the lithium ion battery being characterized by its ohmic resistance (R), its open circuit voltage (Voc), a double layer time constant (τ
=CdlRct), where Cdl is a double layer capacitance of the lithium ion battery and Rct is charge transfer resistance;
obtaining sampled terminal current data for the lithium ion battery;
calculating a present Voc value from the sampled terminal voltage data and the sampled terminal current data, the present Voc value being dependent upon Vdl values of the lithium ion battery; and
generating a present SOC value from the present Voc value.
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Abstract
A method for determining the state of charge (SOC) of a lithium ion battery is provided. The method leverages a circuit model of the lithium ion battery, and generates four battery parameters from which the SOC is derived.
50 Citations
20 Claims
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1. A method for determining state of charge (SOC) of a battery, the method comprising:
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obtaining sampled terminal voltage data for a lithium ion battery, the lithium ion battery being characterized by its ohmic resistance (R), its open circuit voltage (Voc), a double layer time constant (τ
=CdlRct), where Cdl is a double layer capacitance of the lithium ion battery and Rct is charge transfer resistance;obtaining sampled terminal current data for the lithium ion battery; calculating a present Voc value from the sampled terminal voltage data and the sampled terminal current data, the present Voc value being dependent upon Vdl values of the lithium ion battery; and generating a present SOC value from the present Voc value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A method for determining state of charge (SOC) of a battery having an ohmic resistance (R), a double layer voltage (Vdl), an open circuit voltage (Voc), and a characterizing constant
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16. A diagnostic and control system for a vehicle battery, the diagnostic and control system comprising:
a lithium ion battery pack having an ohmic resistance (R), a double layer voltage (Vdl), an open circuit voltage (Voc), and a characterizing constant - View Dependent Claims (17, 18, 19, 20)
Specification