Device for estimating parameters of battery, and estimation method

A device for estimating parameters of battery including:

• a micro-computer,
• a current sensor connected to the battery and the micro-computer for detecting a charging/discharging current of a battery, and
• a voltage sensor connected to the battery and the micro-computer for detecting a terminal voltage of the battery,
• wherein the micro-computer comprises:
• a battery equivalent circuit model including a plurality of resistors and a plurality of capacitors each serving as a factor;
• a unit configured to sequently estimate a logarithmic conversion parameter value obtained by carrying out logarithmic conversion on each factor of the battery equivalent circuit, based on the charging/discharging current and the terminal voltage those being detected;
• and
• an inverse logarithmic conversion unit for obtaining, by carrying out inverse logarithmic conversion on the logarithmic conversion parameter value an antilogarithm corresponding to the logarithmic conversion parameter value,
• wherein the logarithmic conversion parameter value estimation unit includes a Kalman filter to sequentially estimate the logarithmic conversion parameter value,
• wherein the logarithmic conversion parameter value is calculated from a state equation and an output equation, and
• wherein the antilogarithm obtained by the inverse logarithmic conversion unit is used as an estimated parameter value of each factor of the battery equivalent circuit.