BATTERY PACK

PROBLEM TO BE SOLVED: To provide a battery pack which performs proper control over a cell voltage by reducing variance in voltage value of each battery cell.SOLUTION: A battery pack 1 includes: a plurality of parallel units 200 to 215 constituted by connecting a predetermined number of battery cells 2 each having a positive electrode terminal 20a and a negative electrode terminal 20b in parallel; and intermediate conductive plates 5, 6 connecting the parallel units to each other in series by connecting different-polarity electrode terminals of those parallel units to each other. The intermediate conductive plates 5, 6 are plate-like members which extend in a direction in which two series-connected parallel units are arranged. Each of the two series-connected parallel units has a predetermined number of electrode terminals with the same polarity arranged in one array in a direction Y crossing an arrangement direction X of the two parallel units. A pair of electrode terminal groups 20 arranged in an array in the crossing direction Y are arranged in parallel to each other.