METHOD AND APPARATUS FOR ASSESSING BATTERY STATE OF HEALTH
First Claim
1. Method for monitoring a lithium-ion battery cell, comprising:
- monitoring battery cell voltage and a corresponding charge capacity of the battery cell during an electric power event comprising one of an electric power charge event and an electric power discharge event;
determining a measured charge-capacity-derivative by differentiating the charge capacity in relation to the corresponding battery cell voltage during the electric power event;
comparing the measured charge-capacity-derivative with a preferred anode charge-capacity-derivative of an anode curve;
comparing the measured charge-capacity-derivative with a preferred cathode charge-capacity-derivative of a cathode curve;
determining a first state of health parameter of the battery cell corresponding to the comparison of the measured charge-capacity-derivative with the preferred anode charge-capacity-derivative of the anode curve; and
determining a second state of health parameter of the battery cell corresponding to the comparison of the measured charge-capacity-derivative with the preferred cathode charge-capacity-derivative of the cathode curve.
4 Assignments
0 Petitions
Accused Products
Abstract
A method for monitoring a lithium-ion battery cell includes monitoring a battery cell voltage and a corresponding charge capacity 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 charge-capacity-derivative is determined by differentiating the charge capacity in relation to the corresponding battery cell voltage during the electric power event. The measured charge-capacity-derivative is compared with a preferred anode charge-capacity-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 charge-capacity-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 charge-capacity-derivative with the preferred anode charge-capacity-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 charge-capacity-derivative with the preferred cathode charge-capacity-derivative of the cathode curve is determined.
41 Citations
21 Claims
-
1. Method for monitoring a lithium-ion battery cell, comprising:
-
monitoring battery cell voltage and a corresponding charge capacity of the battery cell during an electric power event comprising one of an electric power charge event and an electric power discharge event; determining a measured charge-capacity-derivative by differentiating the charge capacity in relation to the corresponding battery cell voltage during the electric power event; comparing the measured charge-capacity-derivative with a preferred anode charge-capacity-derivative of an anode curve; comparing the measured charge-capacity-derivative with a preferred cathode charge-capacity-derivative of a cathode curve; determining a first state of health parameter of the battery cell corresponding to the comparison of the measured charge-capacity-derivative with the preferred anode charge-capacity-derivative of the anode curve; and determining a second state of health parameter of the battery cell corresponding to the comparison of the measured charge-capacity-derivative with the preferred cathode charge-capacity-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, 20, 21)
-
Specification