METHOD AND DEVICE FOR DETERMINING BATTERY DISCHARGE CAPABILITY, AND POWER SUPPLY SYSTEM

摘要

Regarding a method for determining battery discharge capability of the present invention, the optimum state vector X is estimated by extended Kalman filter operation. Using the estimated state vector X, element parameters of an equivalent circuit 21 are renewed to the optimum (step S7). Furthermore, based on the equivalent circuit 21 using the renewed element parameters, at the time of discharging with a predetermined current pattern from a battery 12, a voltage drop ”V is estimated (step S8). Therefore the discharge capacity of the battery 12 is determined (step S9).