Bolt for battery and battery module

A battery module comprising:

• a plurality of battery cells accommodated in an inner space formed by a plurality of covers;
• wherein the plurality of covers includes an upper cover forming an upper side of the inner space, and a side cover forming a lateral side of the inner space,
• a first fastening hole penetrating the upper cover;
• a second fastening hole penetrating the side cover and aligned with the first fastening hole;
• a nut inserted into the second fastening hole;
• and
• a bolt comprising:
• a head in which at least a portion of a socket is formed;
• a threaded body comprising a threaded area in which a spiral thread is formed;
• and
• a tapered reinforcing neck connected between the head and the threaded body and having a diameter increasing in a direction from the threaded body toward the head;
• and
• a dog point connected to a lower surface of the threaded body and having sections of reduced diameters extending away from the threaded body,
• wherein
• the bolt is fastened to the nut through the first fastening hole and configured to couple together a pair of the plurality of covers, and
• a height of a head of the bolt is less than a thickness of one of the pair the plurality of covers.