Battery module including bus bar assembly slidely disposed on electrode tabs of battery cells and manufacturing method thereof

A method of manufacturing a battery module comprising:

• stacking a plurality of battery cells to form a battery stack, each of the plurality of battery cells including electrode tabs;
• and
• disposing bus bar assemblies on sides of the battery stack, wherein the electrode tabs protrude from the sides of the battery stack,
• wherein the bus bar assemblies extend downwardly toward the electrode tabs,
• wherein at least one of the bus bar assemblies comprises:
• a bus bar support including an insertion portion;
• and
• a bus bar disposed on an outer surface of the bus bar support, the bus bar including a bus bar hole;
• wherein the bus bar support is extended downwardly and a lower side of the bus bar support is bent in a direction where the electrode tabs protrude, the lower side of the bus bar support is positioned below the bus bar,
• wherein the bus bar hole forms a closed curve,
• wherein the insertion portion is opened downwardly, the electrode tab is inserted into the insertion portion and the bus bar hole sequentially, and
• wherein the electrode tab is directly and electrically connected to a circumference of the bus bar hole;
• and
• welding, after disposing the bus bar assemblies on the sides of the battery stack, the electrode tab to the circumference of the bus bar hole.