the present invention discloses a battery pack which can be used for an electric vehicle , an uninterrupted power supply , and a power supply for a smart grid and which can be easily manufactured and repaired and which is capable of improving productivity , the span of life , and performance , and a battery management system including the battery pack . the battery pack of the present invention comprises a casing in which a reception space is provided and battery modules coupled to the casing at regular intervals by fastening members so that the battery modules can be easily dismantled from the casing . each of the battery modules includes a tray , a battery cell provided in the tray , a cell charger provided in the tray and configured to charge the battery cell , a cell controller provided in the tray and configured to control the cell charger , a heating mat coupled to the battery cell , and a temperature sensor provided in the tray and configured to sense a temperature of the battery cell .