BATTERY STATE ESTIMATING APPARATUS

A battery state estimating apparatus according to an embodiment of the present disclosure includes: a voltage measuring unit configured to measure a voltage of a battery cell and measure an open circuit voltage (OCV) of the battery cell whenever the measured voltage reaches a reference charge voltage; and a control unit configured to receive the OCV measured by the voltage measuring unit, calculate a voltage fluctuation rate based on a result obtained by processing the received OCV, determine a voltage increase and decrease pattern based on the calculated voltage fluctuation rate and pre-stored voltage fluctuation rate data, and determine a degradation acceleration degree of the battery cell according to the determined voltage increase and decrease pattern.