TRACKING AGING EFFECT ON BATTERY IMPEDANCE AND TRACKING BATTERY STATE OF HEALTH

摘要

Methods and systems for tracking aging effect on battery impedance are provided. A first voltage associated with a first state of a battery, a second voltage associated with a second state of the battery, and an impedance of the battery are determined. A battery impedance table that is used for calculating a state of charge of the battery is updated using the determined impedance. Methods and systems for tracking state of health of a battery are also provided. Partial charge cycles of a received battery are counted between a first charge event and a second charge event of the battery. State of health data of the batter is tracked, and a new state of health estimation is calculated based on the state of health data if the counted partial charge cycles of the battery has a count value that has a predetermined relationship with a predetermined count threshold.

主权项

1. A method for tracking aging effect on battery impedance, comprising:
determining a first voltage of a battery associated with a first state of the battery; detecting a state change in the battery that corresponds to a second state of the battery having a known current consumption level; determining a second voltage of the battery associated with the second state by sampling a voltage of the battery at the known current consumption level; determining an impedance of the battery based at least on the first voltage, the second voltage, and the known current consumption level; and updating a battery impedance table that is used for calculating a state of charge of the battery using the determined impedance.