BATTERY MODULE HAVING RAIL TYPE SOCKET AND BATTERY PACK INCLUDING THE SAME

A battery module includes a plurality of battery cell assemblies. Each of battery cell assemblies includes two or more cylindrical battery cells connected to each other in parallel, and the plurality of battery cell assemblies are connected to each other in series. Each battery cell assembly having the parallel connection structure is configured such that negative electrodes of the two or more cylindrical battery cells are electrically connected to each other via a rail type socket. The series connection between the battery cell assemblies includes an electrical connection between the rail type socket and positive electrodes of battery cells of an adjacent battery cell assembly via connection members.