Battery module, vehicle provided with same, and bus bar

A bus bar that connects respective electrode terminals of adjacent battery cells in a state where a plurality of battery cells each including an electrode terminal are stacked, the bus bar comprising:

• a first bus bar having a first thickness;
• and
• a second bus bar having a second thickness larger than the first thickness,
• wherein the first bus bar includes
• a terminal connection portion that connects with respective electrode terminals of adjacent ones of the plurality of battery cells, and
• a first flat portion that is in contact with the second bus bar, and
• the second bus bar includes a second flat portion that is in contact with the first flat portion,
• wherein the battery cells include a first battery cell and a second battery cell that are adjacently stacked,
• the terminal connection portion includes
• a first intermediate piece bent from the first flat portion,
• a first terminal connection piece bent via the first intermediate piece in a first direction,
• a second intermediate piece bent from the first flat portion in a direction intersecting with the first intermediate piece, and
• a second terminal connection piece bent via the second intermediate piece in a second direction intersecting with the first direction,
• the first terminal connection piece is directly connected to an electrode terminal of the first battery cell,
• the second terminal connection piece is directly connected to an electrode terminal of the second battery cell,
• the first terminal connection piece and the second terminal connection piece are connected to each other via the first intermediate piece, the first flat portion, and the second intermediate piece interposed therebetween, and the first flat portion extends in a first plane, the first intermediate piece extends in a second plane intersecting the first plane, the second intermediate piece extends in a third plane intersecting the first plane and the second plane.

A battery module comprising:

• a plurality of battery cells each including an electrode terminal;
• and
• a bus bar that connects respective electrode terminals of adjacent ones of the plurality of battery cells in a state where the plurality of battery cells are stacked,
• wherein the bus bar includes
• a first bus bar having a first thickness, and
• a second bus bar having a second thickness larger than the first thickness,
• the first bus bar is connected to the respective electrode terminals of the adjacent ones of the plurality of battery cells, and
• the second bus bar is in non-contact with the electrode terminals of the plurality of the battery cells,
• wherein the first bus bar includes
• a terminal connection portion that connects with the electrode terminals of the plurality of battery cells, and
• a first flat portion that is in contact with the second bus bar, and
• the second bus bar includes a second flat portion that is in contact with the first flat portion,
• wherein the terminal connection portion extends in a first plane, and the first flat portion extends in a second plane intersecting the first plane, and
• the second flat portion extends parallel to, and in direct contact with, the first flat portion.