Battery module, battery pack comprising the same and vehicle

A battery module, comprising:

• at least one cell assembly including a plurality of secondary batteries;
• a gas pipe configured to allow produced gas to move;
• and
• a module housing including:
• a lower case having one open side and an internal space in which the at least one cell assembly is received,
• an upper case coupled to one side of the lower case in a vertical direction to cover the open side of the lower case and having a receiving space in which the gas pipe is received, and
• a first connection hole formed in the upper case such that the gas pipe and the internal space are in communication with each other,
• wherein the gas pipe includes:
• a first connector extending in the vertical direction, the first connector having a top wall and a sidewall;
• and
• a first pipe which extends in a horizontal direction and has a first end releasably connected with the sidewall of the first connector,
• wherein the first connector is retained in the first connection hole, and
• wherein the first connector has four insertion holes spaced around a perimeter of the first connector.