A battery management apparatus comprising: a battery including a plurality of battery cells connected to one another in a series connection; a voltage detector configured to: detect a voltage of each of the plurality of battery cells, and detect a total voltage of the battery; a monitor configured to: when the total voltage of the battery and the voltage of each battery cell are received, accumulate and store the total voltage of the battery and the voltage of each battery cell based on the received time, calculate an average value of the total voltage accumulated and stored for a predetermined time, calculate an average value of each battery cell voltage accumulated and stored for the predetermined time, obtain a covariance and a product of a standard deviation of each battery cell using the average of the calculated total voltage and the average value of each battery cell voltage, calculate a value of a correlation coefficient of each battery cell based on obtained covariance and the obtained product of the standard deviation of the total voltage of the battery and of the standard deviation of the voltage of each battery cell, generate a first identification signal for the calculated value of the correlation coefficient of each battery cell equal to or greater than a reference value, and generate a second identification signal for the calculated value of the correlation coefficient of each battery cell less than the reference value based on the received time; and a storage configured to store the second identification signal among the first identification signal and the second identification signal generated by the monitor for each of the plurality of battery cells based on the received time, wherein the monitor is configured to recognize a risk of failure of each of the plurality of battery cells based on a number of second identification signals stored in the storage for each of the plurality of battery cells. a battery including a plurality of battery cells connected to one another in a series connection; a voltage detector configured to: detect a voltage of each of the plurality of battery cells, and detect a total voltage of the battery; a monitor configured to: when the total voltage of the battery and the voltage of each battery cell are received, accumulate and store the total voltage of the battery and the voltage of each battery cell based on the received time, calculate an average value of the total voltage accumulated and stored for a predetermined time, calculate an average value of each battery cell voltage accumulated and stored for the predetermined time, obtain a covariance and a product of a standard deviation of each battery cell using the average of the calculated total voltage and the average value of each battery cell voltage, calculate a value of a correlation coefficient of each battery cell based on obtained covariance and the obtained product of the standard deviation of the total voltage of the battery and of the standard deviation of the voltage of each battery cell, generate a first identification signal for the calculated value of the correlation coefficient of each battery cell equal to or greater than a reference value, and generate a second identification signal for the calculated value of the correlation coefficient of each battery cell less than the reference value based on the received time; and a storage configured to store the second identification signal among the first identification signal and the second identification signal generated by the monitor for each of the plurality of battery cells based on the received time, wherein the monitor is configured to recognize a risk of failure of each of the plurality of battery cells based on a number of second identification signals stored in the storage for each of the plurality of battery cells. when the total voltage of the battery and the voltage of each battery cell are received, accumulate and store the total voltage of the battery and the voltage of each battery cell based on the received time, calculate an average value of the total voltage accumulated and stored for a predetermined time, calculate an average value of each battery cell voltage accumulated and stored for the predetermined time, obtain a covariance and a product of a standard deviation of each battery cell using the average of the calculated total voltage and the average value of each battery cell voltage, calculate a value of a correlation coefficient of each battery cell based on obtained covariance and the obtained product of the standard deviation of the total voltage of the battery and of the standard deviation of the voltage of each battery cell, generate a first identification signal for the calculated value of the correlation coefficient of each battery cell equal to or greater than a reference value, and generate a second identification signal for the calculated value of the correlation coefficient of each battery cell less than the reference value based on the received time; and a storage configured to store the second identification signal among the first identification signal and the second identification signal generated by the monitor for each of the plurality of battery cells based on the received time, wherein the monitor is configured to recognize a risk of failure of each of the plurality of battery cells based on a number of second identification signals stored in the storage for each of the plurality of battery cells.