Bus bar module

1. A bus bar module which is mounted in an assembled battery in which plural battery cells are arranged so as to alternately arrange polarities of electrodes and electrically connects mutually adjacent electrodes of the plural battery cells by plural bus bars so that the plural battery cells are electrically connected in series by the plural bus bars, comprising:

a holding member for holding the plural bus bars with a mutual distance between the bus bars maintained,

the holding member having:

a first holding member for holding the plural bus bars in one electrode line of the plural battery cells,

a second holding member for holding the plural bus bars in the other electrode line of the plural battery cells, and

a joining member for structurally joining the first holding member to the second holding member,

wherein the joining member is formed in an arch shape upwardly projected from inside ends of the first holding member and the second holding member, the joining member having a rigid part adapted to maintain the arch shape and a flexible part adapted to vertically bend by a load from above.

2. A bus bar module as claimed in claim 1 , wherein the rigid part has a rib for rigid maintenance, and the flexible part is formed in a flat plate shape.

3. A bus bar module as claimed in claim 1 , wherein the flexible part is formed on a lower end of the joining member.