Battery module

A battery module comprising:

• a plurality of battery cells that each include an electrode assembly, a case accommodating the electrode assembly, and a connection terminal protruding from the case, wherein the plurality of battery cells are arranged side by side such that connection terminals of different polarities are adjacent to each other;
• a plurality of bus bars that alternately connect connection terminals that are adjacent to each other in an arrangement direction in which the plurality of battery cells are arranged, thereby connecting the plurality of battery cells in series;
• a plurality of protruding walls each provided between bus bars that are adjacent to each other in the arrangement direction, wherein each protruding wall protrudes further than the connection terminals in a protruding direction in which the connection terminals protrude from the cases, and
• a battery holder holding one of the plurality of battery cells,
• wherein the plurality of bus bars protrude in a direction intersecting the arrangement direction and each include a bent portion that is capable of being deformed to extend in the arrangement direction as the plurality of battery cells expand,
• wherein each bent portion protrudes in the protruding direction, and the plurality of protruding walls protrude further than the bent portions in the protruding direction;
• wherein a pair of partition walls is provided between each connection terminals connected by the bus bar, the pair of partition walls protrude further than the bent portions in the protruding direction, and each pair of the partition walls sandwiches one of the bent portions to define an installation position of the bus bar, and
• wherein the battery holder includes the pair of partition walls.

A battery module comprising:

• a plurality of battery cells that each include an electrode assembly, a case accommodating the electrode assembly, and a connection terminal protruding from the case, wherein the plurality of battery cells are arranged side by side such that connection terminals of different polarities are adjacent to each other;
• a plurality of bus bars that alternately connect connection terminals that are adjacent to each other in an arrangement direction in which the plurality of battery cells are arranged, thereby connecting the plurality of battery cells in series;
• and
• a plurality of protruding walls each provided between the plurality of bus bars that are adjacent to each other in the arrangement direction, wherein each protruding wall protrudes further than the connection terminals in a protruding direction in which the connection terminals protrude from the cases;
• and
• a battery holder holding one of the plurality of battery cells,
• wherein the plurality of bus bars protrude in a direction intersecting the arrangement direction and each include a bent portion that is capable of being deformed to extend in the arrangement direction as the plurality of battery cells expand,
• wherein a connecting wall is provided between each connection terminals connected by the bus bar, the connecting walls protrude further than connection terminals in the protruding direction, and each connecting wall is straddled by one of the bent portions,
• wherein each bent portion remains separated from the corresponding one of the connecting wails even when the plurality of battery cells expand, and
• wherein the battery holder includes the connecting walls.