Electrified vehicle control using battery state of charge and power capability strategy

A method for controlling an electrified vehicle, comprising, by a controller:

• initializing traction battery model parameters for a first resistance, a second resistance, and a capacitance in response to a vehicle key-on;
• controlling at least one of an electric machine and the traction battery in response to a battery state of charge (SOC) and a battery power capability estimated using the battery model including the first resistance in series with the second resistance and the capacitance in parallel to the second resistance, wherein the first resistance, the second resistance, and the capacitance are adjusted during operation of the vehicle using a Kalman filter, and wherein the first resistance, the second resistance, and the capacitance are re-initialized to associated values in response to a change in the battery current exceeding a corresponding current threshold, and in response to at least one of the first resistance, the second resistance, and the capacitance exceeding associated parameter thresholds.