Battery module including bus bar assembly sidely 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 are drawn out from the sides of the battery stack,
• wherein the bus bar assemblies slide down to 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 at least one bus bar hole;
• wherein the bus bar support is extended downward and a lower side of the bus bar support is bent towards an outside of the bus bar support, and the lower side of the bus bar support is positioned below the bus bar,
• wherein the bus bar comprises:
• a first surface facing the outer surface of the bus bar support, and
• a second surface disposed on opposite side of the first surface,
• wherein the bus bar comprises a convex portion being concave on the first surface and convex on the second surface protruding away from the battery stack,
• wherein the bus bar hole forms a closed curve on the first and second surfaces,
• wherein the convex portion is formed in a lower side of the bus bar,
• wherein a lower side of the bus bar hole is formed in the convex portion,
• wherein the insertion portion is opened downward so that the electrode tab is inserted into the insertion portion and the bus bar hole sequentially,
• wherein the electrode tab is electrically connected to a circumference of the bus bar hole by welding after disposing the bus bar assemblies on the sides of the battery stack.