| abstract |
The present invention discloses an apparatus and method for estimating battery capacity using battery voltage behavior. In accordance with an aspect of the present invention, an apparatus for estimating battery capacity includes: a data storage unit configured to obtain and store battery voltage, current, and temperature data from a voltage sensing unit, a current sensing unit, and a temperature sensing unit coupled to a battery at each SOC estimation time point; An SOC estimator for estimating and repeatedly storing the first SOC by the current integration method and the second SOC by the battery voltage behavior at each SOC estimation time point; An SOC accumulation ratio calculation unit configured to calculate and store a ratio of a cumulative change amount of the first SOC (SOC change accumulation rate) to a cumulative change amount of the second SOC calculated during an accumulation ratio calculation time from an SOH estimation request time; And estimating the capacity of the battery by relatively comparing the calculated SOC change accumulation rate based on the SOC change accumulation rate corresponding to the preset reference battery capacity, and storing the estimated ratio of the estimated capacity to the battery shipment capacity as SOH. It includes; SOH estimator. |