Method and apparatus for assessing battery state of health
First Claim
1. Method for monitoring a lithium-ion battery cell, comprising:
- monitoring a battery cell voltage and a corresponding state of charge of the battery cell during an electric power event;
determining a measured potential-derivative by differentiating the battery cell voltage in relation to the corresponding state of charge of the battery during the electric power event;
comparing the measured potential-derivative with a preferred anode potential-derivative of an anode curve;
comparing the measured potential-derivative with a preferred cathode potential-derivative of a cathode curve;
determining a first state of health parameter of the battery cell corresponding to the comparison of the measured potential-derivative with the preferred anode potential-derivative of the anode curve; and
determining a second state of health parameter of the battery cell corresponding to the comparison of the measured potential-derivative with the preferred cathode potential-derivative of the cathode curve.
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Abstract
A method for monitoring a lithium-ion battery cell includes monitoring a battery cell voltage and a corresponding state of charge of the battery cell during an electric power event which may include either an electric power charge event or an electric power discharge event. A measured potential-derivative is determined by differentiating the battery cell voltage in relation to the corresponding state of charge of the battery during the electric power event. The measured potential-derivative is compared with a preferred anode potential-derivative of an anode charge curve (for electric power discharge events) or an anode discharge curve (for electric power charge events), and with a preferred cathode potential-derivative of a cathode charge curve (for electric power charge events) or a cathode discharge charge curve (for electric power discharge events). A first state of health parameter of the battery cell corresponding to the comparison of the measured potential-derivative with the preferred anode potential-derivative of the anode curve is determined. And, a second state of health parameter of the battery cell corresponding to the comparison of the measured potential-derivative with the preferred cathode potential-derivative of the cathode curve is determined.
33 Citations
19 Claims
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1. Method for monitoring a lithium-ion battery cell, comprising:
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monitoring a battery cell voltage and a corresponding state of charge of the battery cell during an electric power event; determining a measured potential-derivative by differentiating the battery cell voltage in relation to the corresponding state of charge of the battery during the electric power event; comparing the measured potential-derivative with a preferred anode potential-derivative of an anode curve; comparing the measured potential-derivative with a preferred cathode potential-derivative of a cathode curve; determining a first state of health parameter of the battery cell corresponding to the comparison of the measured potential-derivative with the preferred anode potential-derivative of the anode curve; and determining a second state of health parameter of the battery cell corresponding to the comparison of the measured potential-derivative with the preferred cathode potential-derivative of the cathode curve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification