BATTERY STATE ESTIMATION DEVICE

摘要

Provided is a battery state estimation device capable of accurately estimating the internal state of a battery in consideration of a slow response portion of the battery. The battery state estimation device comprises: a charge/discharge current detection unit; a terminal voltage detection unit; an equivalent circuit model having fast and slow response portions of a battery; a sequential parameter estimation unit for performing, based on a charge/discharge current value and a terminal voltage value, a sequential parameter estimation by using only the fast response portion of the response portions; a constant setting unit for setting a constant representing resistance and the capacitance of a capacitor in the slow response portion of the equivalent circuit model; a plurality of multiplication units for multiplying each of the parameter estimated in the sequential parameter estimation unit and the constant by the charge/discharge current value; and an addition unit for adding these multiplied values to obtain the overvoltage value of the battery.