Bus bar assembly structure and battery module

A bus bar assembly structure comprising:

• an electrode terminal;
• and
• a plate-shaped bus bar that is assembled to the electrode terminal, wherein
• the bus bar includes a flat portion having an insertion hole through which the electrode terminal is inserted, and a bent portion that protrudes from one side of the flat portion,
• the electrode terminal includes an externally threaded fastener that includes a shaft portion to be inserted through the insertion hole, and an internally threaded fastener that has a threaded portion in an inner peripheral side thereof to be screwed on a tip of the shaft portion extending out from the insertion hole,
• the bus bar has a burr along an edge of one of openings of the insertion hole,
• the internally threaded fastener has a tapered portion at an edge of one of openings of the threaded portion, and the tapered portion has a largest diameter that is greater than a bore diameter of the insertion hole, and
• the flat portion of the bus bar is held between the externally threaded fastener and the internally threaded fastener while the burr is located within a space created by the tapered portion.