Provided is a battery module. The battery module includes: a first cooling pipe; a second cooling pipe connected to the first cooling pipe and arranged on a different plane than the first cooling pipe; and a branch unit connecting the first cooling pipe and second cooling pipe, wherein the branch unit includes: a lower connection pipe connected to the first cooling pipe; an upper connection pipe connected to the second cooling pipe; and a connection member into which one of the lower connection pipe and the upper connection pipe is inserted and which is inserted into the other one of the lower connection pipe and the upper connection pipe.