Abstract: A battery module includes: a plurality of battery cells stacked in a predetermined direction; a restraint member that applies, to the plurality of battery cells, restraint force along the predetermined direction; and a plurality of bus bars that electrically connects the plurality of battery cells together, the plurality of bus bars including a first bus bar and a second bus bar. The first bus bar has a first joining portion that joins separated members to each other by a first joining form, and connects, via the first joining portion, between battery cells adjacent to each other in the predetermined direction. The second bus bar has a second joining portion that joins separated members to each other by a second joining form different from the first joining form, and connects, via the second joining portion, between battery cells adjacent to each other in the predetermined direction.

Abstract: A battery module includes: a plurality of battery cells stacked in a predetermined direction; and a plurality of bus bars that electrically connect the plurality of battery cells together. The plurality of bus bars include a first bus bar extending between a first battery cell and a second battery cell of the plurality of battery cells, the first battery cell and the second battery cell being adjacent to each other in the predetermined direction. The first bus bar has a first base portion connected to the first battery cell, a second base portion connected to the second battery cell, and a rising portion that has a shape to rise from the first base portion and the second base portion and that connects between the first base portion and the second base portion. A fragile portion is provided in a root region of the rising portion.