Parameter and state limitation in a model-based battery control

摘要

A method of determining battery performance may include: determining a circuit model for a battery including a first resistor (r1) in series with a second resistor (r2) and a parallel capacitor (C); Establishing the upper and lower limits for r1, r2, and C based on a battery temperature, a battery state of charge, or both; Application of an EKF to determine r1, r2 and C within the specified upper and lower limits; and output battery capacity based on r1, r2, and r3. The upper and lower limits can be adjusted based on the age of the battery.