Patent ID: 8907624

Claim:
A battery system, comprising: a battery pack configured to include at least a plurality of battery cells that are connected in series, a monitor that monitors a state of the plurality of battery cells, and a controller to which an output of the monitor is supplied; a battery pack module in which the battery pack in a first order to the battery pack in an Nth order are connected in series; and an integrated controller that is connected with the battery pack in the first order of the battery pack module; wherein isolators are respectively disposed among the battery pack in the first order to the battery pack in the Nth order, and a signal is transmitted from the battery pack in an order of n−1 (N≧n≧2) to the battery pack in an order of n via one of the isolators, wherein, n and N are positive integers, a reference potential point of the battery pack in the order of n−1 (N≧n≧2) is connected to a primary side of the isolator that is included in the battery pack in the order of n, and a secondary side of the isolator that is included in the battery pack in the order of n is connected to a reference potential point of the battery pack in the order of n.