Rechargeable battery module

A method of manufacturing a rechargeable battery module, comprising:

• stacking a plurality of battery cells in a first direction;
• providing a busbar holder such that the busbar holder at least partially covers the battery cells while exposing electrode terminals of the battery cells;
• connecting the electrode terminals of the battery cells via a busbar, the electrode terminals of the battery cells being exposed through a busbar support portion of the busbar holder;
• providing a flexible printed circuit (FPC) on and electrically connecting the flexible printed circuit to the busbar, the flexible printed circuit forming an exposure hole in a vertical direction perpendicular to the first direction and exposing a copper thin film portion of the flexible printed circuit in a direction toward the busbar;
• and
• inserting a metal tab into an interior of the flexible printed circuit and electrically connecting the metal tab to a surface of the copper thin film portion, the metal tab being exposed outwardly through the exposure hole of the flexible printed circuit.

A system for use in a rechargeable battery module, the system comprising:

• a busbar;
• and
• flexible printed circuit (FPC) disposed on and electrically connected to the busbar, the flexible printed circuit comprising:
• an exposure hole formed in the flexible printed circuit in a vertical direction;
• a copper thin film portion, the copper thin film portion being exposed in a direction towards the busbar;
• and
• a metal tab inserted into an interior of the flexible printed circuit, the metal tab being electrically connected to a surface of the copper thin film portion and exposed outwardly through the exposure hole.