Battery management system and method of controlling the same

A method of controlling a battery management system (BMS) of an electric vehicle having a battery, the method comprising:

• charging the battery, wherein the battery comprises one or more battery packs each including a plurality of battery cells;
• calculating an amount actually charged in the battery from a first point in time when the charging of the battery begins to a second point in time when the battery charging actually reaches a charge completion value;
• and
• calculating a state of health (SOH) of the battery based on a ratio of i) the actual charge amount to ii) a preset charge amount expected to be charged from the first time point to the second time point.

A battery management system (BMS) of an electric vehicle having a battery, the BMS comprising:

• a reference setup device configured to set a charge completion value, wherein the battery comprises at least one battery pack;
• a charge amount calculator configured to calculate an amount actually charged in the battery during a time period;
• and
• an SOH calculator configured to calculate the SOH of the battery based on a ratio of i) the actual charge amount to ii) a preset charge amount expected to be charged during the time period.