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.