Connection module

A connection module to be mounted on a group of power storage elements each having positive and negative electrode terminals, the group of power storage elements including a first output electrode terminal for outputting electrical power of one polarity and a second output electrode terminal for outputting electrical power of the other polarity, the connection module, comprising:

• a busbar holding module including a plurality of busbars that each connect the positive electrode terminal and the negative electrode terminal of adjacent power storage elements and insulating protectors that hold the plurality of busbars;
• and
• an external connection busbar holder disposed above the busbar holding module;
• wherein the insulating protectors include fixing portions joined to fixed portions provided in the power storage elements or another member fixed to the power storage elements, so as to fix the external connection busbar holder,
• wherein the external connection busbar holder includes:
• a first external connection busbar having one end and another end, the one end being electrically connected to the first output electrode terminal and an external connection member being bolted to the other end;,
• a second external connection busbar having one end and another end, the one end being electrically connected to the second output electrode terminal and an external connection member being bolted to the other end;
• and
• engaging portions that engage with the fixing portions,
• wherein each of the fixing portions includes a fixing-reinforcement portion that is displaced to fill a clearance between the fixing portion and the fixed portion in response to engagement with the engaging portion.