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1. WO2021044134 - METHOD AND SYSTEM FOR PREDICTING BATTERY DEGRADATION

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1. A method for analysing degradation of a battery, the method comprising:

measuring a set of variables for a battery;

selecting parameters for a degradation model which predicts degradation of the battery and which comprises a calendar ageing component and a cycling ageing component;

predicting a predicted degradation value for the battery using the degradation model and the selected parameters;

obtaining an estimated degradation value for the battery using the set of measured variables;

updating the parameters for the degradation model based on the predicted and estimated degradation values and

outputting a final degradation value based on the estimated and predicted degradation values.

2. The method of claim 1 , further comprising

updating the measurement of the set of measured variables for the battery; predicting an updated predicted degradation value for the battery using the degradation model and the updated parameters;

obtaining an updated estimated degradation value for the battery using the updated set of measured variables;

repeating the updating of the parameters for the degradation model based on the updated estimated degradation value and the updated predicted degradation value and outputting an updated final degradation value based on the updated estimated degradation value and the updated predicted degradation value.

3. The method of claim 1 or claim 2, wherein the set of measured variables comprise at least one of current, voltage, state of charge, depth of discharge, temperature, number of full equivalent cycles and CP-rate.

4. The method of any one of the preceding claims, comprising selecting parameters for the degradation model based on characteristics of the battery.

5. The method of claim 4, wherein the characteristics of the battery comprise at least one of a manufacturer of the battery and chemistry of the battery.

6. The method of any one of the preceding claims, wherein the calendar ageing component is a function of state of charge, temperature and time.

7. The method of claim 6, wherein the calendar ageing component is defined as:


where SoC is state of charge, T is temperature, t is time, R is the gas constant in KJmol 1,

EAI is the activation energy in KJmol 1 K1, bi,
and bi are the parameters.

8. The method of any one of the preceding claims, wherein the cycling ageing component is a function of state of charge, depth of discharge, constant power (discharge/charge) rate and temperature.

9. The method of claim 8, wherein the cycling ageing component is defined as:


where EFC is equivalent full cycles, SoC is state of charge, DoD is depth of discharge, CP rate is constant power (discharge/charge) rate, T is temperature, EA2 is the activation energy in KJmol 1 K 1, bå, a2, b2, C2, and d2are the parameters.

10. The method of any one of the preceding claims, wherein updating the parameters for the degradation model comprises using a Kalman Filter.

11. The method of any one of the preceding claims, comprising outputting a final degradation value using a Kalman Filter.

12. The method of any one of the preceding claims, comprising

collecting data relating to the degradation of a plurality of batteries and generating the degradation model using the collected data.

13. The method according to claim 12, comprising generating the parameters as fitting parameters.

14. A computer readable medium carrying processor control code which when implemented in a system causes the system to carry out the method of any one of claims 1 to 13.

15. A battery analysing system comprising

at least one sensor for measuring a battery parameter;

a processor which is configured to carry out the method of any one of claims 1 to 13, and

a user interface which is configured to display the output result which is generated by the processor.