Bus bar, bus bar module, and manufacturing method of bus bar

A bus bar module, comprising:

• a plurality of bus bars each electrically connected to electrode terminals of a battery cell among a plurality of battery cells arranged side by side;
• and
• a bus bar module case having a bus bar accommodating portion that accommodates each of the plurality of bus bars, wherein
• the plurality of bus bars each include:
• two single-layer bus bars each electrically connect to each of the electrode terminal of the adjacent battery cells and each constituted by a metal plate-like member;
• and
• a laminated bus bar having a plurality of metal plate-like members provided in an overlapping manner, the laminated bus bar provided across the two single-layer bus bars and electrically connecting the two single-layer bus bars,
• the laminated bus bar has overlapping regions arranged in an overlapping manner with the respective single-layer bus bars, and
• the overlapping regions are each provided with an adhesive bonding portion in which one of the plate-like members of the laminated bus bar adheres to and is bonded to the plate-like member of the single-layer bus bar by pressing the laminated bus bar and the single-layer bus bars.

A manufacturing method of a bus bar, the manufacturing method comprising:

• a preparation step of preparing two single-layer bus bars each constituted by a metal plate-like member and a laminated bus bar having a plurality of metal plate-like members provided in an overlapping manner;
• an arrangement step of providing the laminated bus bar across the single-layer bus bars such that overlapping regions are formed, the overlapping regions in which the laminated bus bar is disposed in an overlapping manner with each of the single-layer bus bars;
• and
• a pressing step of pressing the laminated bus bar and the single-layer bus bars in the respective overlapping regions to form adhesive bonding portions in which one of the plate-like members of the laminated bus bar adheres to and is bonded to the plate-like member of the single-layer bus bar.