Battery module

A battery module comprising:

• a plurality of cell stacks, each of the plurality of cell stacks comprising a plurality of unit cells aligned with each other in a first direction, each unit cell comprising terminal parts;
• an insulating member around the plurality of unit cells;
• a module housing comprising a plurality of receiving parts aligned in the first direction and a second direction, crossing the first direction, wherein the cell stack is configured to be inserted into a corresponding one of the plurality of receiving parts;
• a stack bus bar electrically connecting at least some of the plurality of unit cells to each other;
• a connection bus bar electrically connecting two cell stacks of the plurality of cell stacks adjacent to each other in the second direction;
• a terminal bus bar extending from the cell stack;
• a module bus bar connected to the terminal bus bar and configured to be extended outside of the module housing and inserted into an adjacent module housing;
• a coupler in the module housing and coupled to an adjacent module housing and
• an outer wall around an inner space of the module housing, the outer wall comprising a first wall facing the second direction and a second wall opposite the first wall,
• wherein each of the plurality of receiving parts comprises a fixing wall around the cell stack, at least a portion of the fixing wall being in contact with the cell stack,
• wherein the cell stacks of the plurality of cell stacks adjacent to each other in the second direction are electrically connected to each other,
• wherein the cell stacks of the plurality of cell stacks adjacent to each other in the first direction are electrically disconnected from each other, when not connected in an end module at the opposite end of an electricity-consuming device in a battery pack to which a plurality of the battery modules are coupled,
• wherein the terminal bus bar is connected to a unit cell of the plurality of unit cells at one end of the cell stack, and the connection bus bar is connected to a unit cell of the plurality of unit cells at another end thereof,
• wherein the plurality of receiving parts form a first column and a second column arranged with each other in the first direction, each of the first column and the second column extending in the second direction,
• wherein the one end of the cell stack faces a region between the first column and the second column,
• wherein the terminal bus bar extends to overlap the region between the first column and the second column, and
• wherein the coupler comprises:
• a connection tunnel at a central portion of the first wall, the connection tunnel protruding in the second direction and comprising a hollow region into which the module bus bar is configured to extend from inside the module housing;
• and
• a tunnel insertion hole on the second wall into which the connection tunnel of the adjacent module housing and the module bus bar are configured to be inserted.