Connection module

A connection module that is to be mounted on a power storage element group including power storage elements having a positive electrode terminal and a negative electrode terminal, the connection module comprising:

• bus bars each including a plate member that connects the positive electrode terminal and the negative electrode terminal of adjacent power storage elements among the power storage elements;
• a first sheet member that is expandable and includes an adhesive member on a surface thereof;
• and
• second sheet members disposed on the first sheet member at intervals and formed of a hard insulation member that is not expandable, each of the second sheet members having a fixing portion that fixes each of the bus bars independently, wherein
• each of the bus bars includes a fitting portion that extends from one edge of the plate member with respect to a width direction thereof and fits in the fixing portion of each second sheet member,
• the first sheet member holds each of the second sheet members with the adhesive member, each of the bus bars is fixed to each second sheet member, and whereby the first sheet member commonly holds the bus bars, and
• the first sheet member is formed of a flexible insulation member such that the flexible insulation member is expandable at sections between adjacent second sheet members in a longitudinal direction of the first sheet member, and the flexible insulation member is expandable at least in a distance of a maximum value of tolerance that is a total value of tolerances of an electrode pitch with respect to an arrangement direction in which the adjacent power storage elements are arranged.