Methods and apparatus for battery management
AssigneeSemiconductor Components Industries, LLC
InventorHideo KONDO
Life of this patent
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Abstract
Various embodiments of the present technology comprise a method and apparatus for battery management. In various embodiments, the apparatus comprises a lithium ion battery and a fuel gauge circuit to monitor the resistance and the capacity as the battery ages. The fuel gauge circuit utilizes the resistance and capacity values to compute resistance changes due to both cycle aging and calendar aging separately. The fuel gauge circuit utilizes the change in resistance values to determine aged capacity values. The fuel gauge circuit controls charging/discharging of the battery according to the aged capacity values.
Claims20
An apparatus for monitoring a battery, comprising:
- a fuel gauge circuit coupled to the battery and comprising:
- a voltage sensor coupled to the battery and configured to measure a battery voltage;
- a current sensor coupled to the battery and configured to measure a battery current;
- and
- a logic unit coupled to the voltage and current sensors, wherein the logic unit is configured to compute:
- a first battery resistance according to a first measured voltage and a first measured current;
- and
- a second battery resistance according to a second measured voltage and a second measured current;
- and
- a memory coupled to the logic unit and configured to store battery characteristic data;
- wherein the fuel gauge is configured to:
- measure a relative state of charge (RSOC) value of the battery;
- compute a change in resistance;
- and
- determine an aged capacity value according to the change in resistance.
A method for managing charging of a battery, comprising:
- determining a first aged capacity value due to cycle aging;
- determining a second aged capacity value due to calendar aging;
- comparing the first and second aged capacity values;
- and
- controlling charging of the battery according to the comparison of first and second aged capacity values.
A system capable of managing charging/discharging of a battery, comprising:
- a fuel gauge circuit coupled to the battery and configured to:
- store new battery characteristic data and aged battery characteristic data;
- measure a voltage of the battery;
- measure a current of the battery;
- measure a relative state of charge (RSOC) value of the battery;
- compute a resistance of the battery;
- compute a change in resistance of the battery;
- determine an aged capacity value according to the change in resistance;
- and
- generate a control signal according to the aged capacity;
- and
- a charger circuit coupled to the fuel gauge circuit and the battery, wherein the charger circuit is responsive to the control signal and charges the battery according to the control signal.
Dependencies are inferred from the claim text.