BATTERY MODULE

PROBLEM TO BE SOLVED: To suppress the number of components and improve assembly workability by integrally forming bus bars, using a resin, while including a circuit detecting a voltage of each of unit cells, the bus bars connecting each of the unit cells with each other in series.SOLUTION: A bus bar module 10 is formed by integrally forming, using a resin, bus bars 11, 12 electrically connecting between positive and negative electrodes of adjacent unit cells 1 and a detecting circuit 13 detecting the voltages of the unit cells 1. One bus bar 11 in the bus bar module 10 connects the positive electrode of one unit cell 1a with the negative electrode of a positive electrode-side unit cell 1b positioned further towards the positive electrode side of the battery module than the unit cell 1a, and other bus bar 12 connected to the negative electrode of the unit cell 1a is connected to the positive electrode of a negative electrode-side unit cell 1c positioned further towards the negative electrode side of the battery module than the unit cell 1a. The detecting circuit 13 is arranged between the bus bar 11 and the bus bar 12, and detects the voltages of the unit cell 1a and the positive electrode-side unit cell 1b.