BATTERY STATE ESTIMATION DEVICE AND STORAGE BATTERY SYSTEM

摘要

After charging or discharging is stopped, a reference timing (t0) is set, and a first timing (t1) at which battery voltage (V) changes by a unit amount (N) with respect to the reference timing (t0), and a second timing (t2) at which the battery voltage changes by twice more than the unit amount with respect to the reference timing (t0) are select and set. The ratio of the time difference (t2−t1) between the first and the second timing to the time difference (t1−t0) between the reference and the first timing is found as a voltage change parameter (R) corresponding to the rate of change of the change speed of the voltage battery. An estimation device considers the change rate determined by the parameter is considered to be unchanged during an electrical current non-passage, and estimates a stable open circuit voltage at an object timing in future after the second timing.

主权项

1. A battery state estimation device comprising:
a measured value obtaining portion obtaining measured values of the battery voltage as the terminal voltage of a storage battery in order; a timing setting portion in which during electrical current non-passage after charging or discharging of the storage battery is stopped, a reference timing is set, and a first timing at which battery voltage changes by a predetermined first voltage value with respect to the reference timing, and a second timing at which the battery voltage changes by a predetermined second voltage value larger than the predetermined first voltage value are set by using the measured value of the battery voltage; and an open circuit voltage estimation portion which estimates an open circuit voltage of the storage battery at an object timing after the second timing based on a first time difference between the reference and the first timing and a second time difference between the first and the second timing.