Battery adaptive charging using a battery model
Batteries and associated charging conditions or other operating conditions are evaluated by a computational model that classifies or characterizes the battery and associated conditions. Such battery model may classify batteries according to any of many different considerations such as whether the conditions are safe or unsafe or whether the conditions are likely to unnecessarily degrade the future performance of the battery. In some cases, the battery model executes while the battery is installed in an electronic device such as a smart phone or a vehicle. In some cases, the battery model executes and provides results (e.g., a classification of the battery) in real time while the battery is installed and being charged.
1. A method of classifying and adjusting use of a battery, the method comprising:
(a) obtaining values of one or more charge process parameters currently applied to or to be applied to the battery;
(b) providing the values of the one or more charge process parameters to a battery model designed or configured to characterize the battery and the one or more charge process parameters;
(c) receiving from the battery model, a battery charge process characteristic that provides a predicted effect of charging the battery under conditions indicated by the one or more process parameters currently applied to or to be applied to the battery; and
(d) based on the battery charge process characteristic received from the model, (i) adjusting a charge process used to charge the battery and/or (ii) terminating use of the battery, at least temporarily.
2. The method of claim 1 , wherein the one or more charge process parameters comprise at least a state of charge of the battery and a charge current applied to the battery.
3. The method of claim 1 , wherein the one or more charge process parameters comprise at least an open circuit voltage of the battery or a voltage or voltage profile produced in response to a stimulus applied to the battery.
4. The method of claim 1 , wherein the battery model is designed or configured to provide at least two battery charge process characteristics selected from the group consisting of safe charging, safe but slow charging, potentially unsafe charging, and known unsafe charging.
5. The method of claim 1 , wherein obtaining the values of the one or more charge process parameters comprises measuring or determining values of current and/or voltage applied to and/or generated across terminals of the battery.
6. The method of claim 1 , wherein obtaining the values of the one or more charge process parameters comprises determining a value of charging current to be applied to the battery in the future.
7. The method of claim 1 , wherein the battery model was produced using a machine learning process.
8. The method of claim 1 , further comprising, after (c), modifying the battery model using data obtained from other batteries.
9. The method of claim 1 , wherein the battery model accurately provides the predicted effect only for the battery or for a group of batteries of the same battery type.
10. The method of claim 1 , wherein the battery model comprises a multidimensional plot, a look up table, a neural network a regression model, a support vector machine, a random forest model, or a classification and regression tree.
11. The method of claim 1 , wherein operations (a)-(d) are performed while the battery is installed in an electronic device.
12. The method of claim 1 , wherein operations (a)-(d) are performed while the battery is being charged.
13. The method of claim 1 , wherein obtaining values of one or more charge process parameters comprises:
applying a stimulus to the battery;
measuring the battery's response to the stimulus during a time regime or a frequency regime where the battery's response reflects a physical phenomenon occurring in the battery; and
using the battery's response, as measured, to characterize the physical phenomenon.
14. The method of claim 1 , wherein adjusting a charge process used to charge the battery comprises adapting a charging process of the battery.
15. The method of claim 14 , wherein adapting a charging process of the battery comprises modifying one or more current steps or current pulses that are used in the charging process.
16. A battery charging system for classifying and adjusting use of a battery, the system comprising:
charging and/or monitoring circuitry designed or configured to apply a charge signal to the battery, and measure a voltage at terminals of the battery; and
control circuitry, coupled to the charging and/or monitoring circuitry, designed or configured to cause the system to:
(a) obtain values of one or more charge process parameters currently applied to or to be applied to the battery;
(b) provide the current values of the one or more charge process parameters to a battery model designed or configured to characterize the battery and the one or more charge process parameters;
(c) receive from the battery model, a battery charge process characteristic that provides a predicted effect of charging the battery under conditions indicated by the one or more process parameters currently applied to or to be applied to the battery; and
(d) based on the battery charge process characteristic received from the model, (i) adjust a charge process used to charge the battery and/or (ii) terminate use of the battery, at least temporarily.
17. The battery charging system of claim 16 , wherein the one or more charge process parameters comprise at least a state of charge of the battery and a charge current applied to the battery.
18. The battery charging system of claim 16 , wherein the one or more charge process parameters comprise at least an open circuit voltage of the battery or a voltage or voltage profile produced in response to a stimulus applied to the battery.
19. The battery charging system of claim 16 , wherein the battery model is designed or configured to provide at least two battery charge process characteristics selected from the group consisting of safe charging, safe but slow charging, potentially unsafe charging, and known unsafe charging.
20. The battery charging system of claim 16 , wherein the control circuitry is designed or configured to cause the system to obtain the values of the one or more charge process parameters from measured or determined values of current and/or voltage applied to and/or generated across terminals of the battery.
21. The battery charging system of claim 16 , wherein the control circuitry is designed or configured to cause the system to obtain the values of the one or more charge process parameters from a value of charging current to be applied to the battery in the future.
22. The battery charging system of claim 16 , wherein the battery model was produced using a machine learning process.
23. The battery charging system of claim 16 , the control circuitry is further designed or configured to cause the system to, after performing (c), modify the battery model using data obtained from other batteries.
24. The battery charging system of claim 16 , wherein the battery model is capable of accurately providing the predicted effect only for the battery or for a group of batteries of the same battery type.
25. The battery charging system of claim 16 , wherein the battery model comprises a multidimensional plot, a look up table, a neural network a regression model, a support vector machine, a random forest model, or a classification and regression tree.
26. The battery charging system of claim 16 , wherein the control circuitry is further designed or configured to cause the system to perform operations (a)-(d) while the battery is installed in an electronic device.
27. The battery charging system of claim 16 , wherein the control circuitry is further designed or configured to cause the system to perform operations (a)-(d) while the battery is being charged.
28. The battery charging system of claim 16 , wherein the control circuitry is designed or configured to cause the system to obtain the values of the one or more charge process parameters by:
applying a stimulus to the battery;
measuring the battery's response to the stimulus during a time regime or a frequency regime where the battery's response reflects a physical phenomenon occurring in the battery; and
using the battery's response, as measured, to characterize the physical phenomenon.
29. The battery charging system of claim 16 , the control circuitry is designed or configured to cause the system to adjust the charge process by adapting a charging process of the battery.
30. The battery charging system of claim 29 , the control circuitry is designed or configured to cause the system to adapt the charging process by modifying one or more current steps or current pulses that are used in the charging process.
31. The battery charging system of claim 16 , wherein charging and/or monitoring circuitry is further configured to measure a temperature of the battery, and wherein an expected voltage is dependent on the measured temperature.
32. The battery charging system of claim 16 , wherein charging and/or monitoring circuitry is further configured to measure a current produced by the battery during the charge process.