BATTERY SYSTEM AND BUSBAR USED IN SAME BATTERY SYSTEM

In order to prevent delamination of a joint section between a lead wire and a busbar, a battery system according to the present invention is provided with: a battery laminated body formed by laminating a plurality of battery cells; a busbar (3) for connecting electrode terminals of the battery cells; a lead wire (8) electrically connected to the busbar (3); and a voltage detection circuit for detecting the voltage of the battery cells via the lead wire (8). The busbar (3) is provided with: a busbar body (3A) provided with terminal connection sections (4) to which electrode terminals are connected; and a lead-wire fixing section (3B) to which the lead wire (8) is fixed. Furthermore, the busbar (3) has, on a first surface (31) thereof, a connection region (5) to which the lead wire (8) is electrically connected and has, in the lead-wire fixing section (3B), a lock/joint section (6) for locking and joining the lead wire (8) in a manner separated from the connection region (5). The lock/joint section (6) has a th