Patent ID: 8742619

Claim:
A battery system comprising: a first battery module; a second battery module; a first communication path; and a bus communication path, wherein said first battery module includes a first battery cell group including one or a plurality of battery cells, a first state detector that detects an abnormal state or a normal state relating to charge and discharge of said first battery cell group, and generates a first detection signal representing the detected state, and a first CAN (Controller Area Network) communication circuit that sends the first detection signal generated by said first state detector to said bus communication path according to a CAN standard, said second battery module includes a second battery cell group including one or a plurality of battery cells, a second state detector that detects an abnormal state or a normal state relating to charge and discharge of said second battery cell group, and generates a second detection signal representing the detected state, and a second CAN communication circuit that sends the second detection signal generated by said second state detector to said bus communication path according to the CAN standard, said first communication path is provided to transmit said first detection signal generated by said first state detector to at least one of said second CAN communication circuit and said second state detector, and said bus communication path is provided to transmit said first detection signal sent by said first CAN communication circuit to an external object, while transmitting said second detection signal sent by said second CAN communication circuit to the external object.