A battery pack , comprising: a cover structure including a first cover frame having a plate shape with both front and rear ends bent leftward to form an inner space and a second cover frame having a portion coupled to the first cover frame and having a plate shape with both front and rear ends bent rightward to form an inner space; a first battery module accommodated in the inner space of the first cover frame and having a plurality of battery cells ; and a second battery module accommodated in the inner space of the second cover frame and having a plurality of battery cells , characterized in that the first cover frame includes a first body portion having a plate shape extending in a vertical direction with respect to the ground and a front and rear direction and configured to cover a right side of the first battery module , and a first bent portion configured to extend leftward from both front and rear ends of the first body portion to cover front and rear outer sides of the first battery module , and the second cover frame includes a second body portion having a plate shape extending in a vertical direction with respect to the ground and a front and rear direction and coupled to a right side of the first body portion to cover a left side of the second battery module , and a second bent portion configured to extend leftward from both front and rear ends of the second body portion to cover front and rear outer sides of the second battery module , wherein the first body portion of the first cover frame and the second body portion of the second cover frame are coupled together and make close contact with each other. a cover structure including a first cover frame having a plate shape with both front and rear ends bent leftward to form an inner space and a second cover frame having a portion coupled to the first cover frame and having a plate shape with both front and rear ends bent rightward to form an inner space; a first battery module accommodated in the inner space of the first cover frame and having a plurality of battery cells ; and a second battery module accommodated in the inner space of the second cover frame and having a plurality of battery cells , characterized in that the first cover frame includes a first body portion having a plate shape extending in a vertical direction with respect to the ground and a front and rear direction and configured to cover a right side of the first battery module , and a first bent portion configured to extend leftward from both front and rear ends of the first body portion to cover front and rear outer sides of the first battery module , and the second cover frame includes a second body portion having a plate shape extending in a vertical direction with respect to the ground and a front and rear direction and coupled to a right side of the first body portion to cover a left side of the second battery module , and a second bent portion configured to extend leftward from both front and rear ends of the second body portion to cover front and rear outer sides of the second battery module , wherein the first body portion of the first cover frame and the second body portion of the second cover frame are coupled together and make close contact with each other. <EOS>