Battery module including multiple parallel battery cells

A battery module, comprising:

• cylindrical battery cells including top caps and positioned such that the top caps face upward;
• a bus bar unit connecting the cylindrical battery cells in series and in parallel,
• wherein the cylindrical battery cells include:
• a first bank cell group in which first cylindrical battery cells are arranged in two or more rows;
• and
• a second bank cell group in which second cylindrical battery cells are arranged in two or more rows in a first direction parallel to the first bank cell group,
• wherein the bus bar unit includes:
• a first terminal bus bar disposed on the first bank cell group and electrically connected to a positive electrode of each of the first cylindrical battery cells;
• a second terminal bus bar disposed on the second bank cell group and electrically connected to a negative electrode of each of the second cylindrical battery cells;
• and
• a fishbone bus bar disposed on the first bank cell group and the second bank cell group and electrically connected to a negative electrode of each of the first cylindrical battery cells and a positive electrode of each of the second cylindrical battery cells;
• and
• a heat dissipation unit disposed below a bottom frame of a cell case,
• wherein the heat dissipation unit includes:
• a cooling plate made of a metal material and disposed below the bottom frame;
• and
• an insulation sheet disposed on an upper surface of the cooling plate.