Abstract: A relay (20) receives a battery information acquisition time from each battery module (10) and calculates measurement time differential information ?t, that is, a time difference between the battery information acquisition time as a reference and the battery information acquisition time of another battery module (10) among the received battery information acquisition times, for each battery module (10). A measurement time correction unit (115) of each battery module (10) corrects a measurement time by the measurement time differential information ?t, using the measurement time differential information ?t received from the relay (20) to adjust the battery information acquisition time of each battery module (10) to the same time.

Abstract: When detecting a fault of a master control device, a slave control device refers to master-device-line information, and obtains line information to establish a connection with the other master control device. The slave control device transmits connection request information to the master control device extracted from the other master control devices. The other master control device determines whether or not it is connectable with the slave control device that has transmitted the connection request information, and transmits a determination result as connectability information. The slave control device switches a communication line to the other master control device when the received connectability information indicates the connectable status.

Abstract: A relay (20) receives a battery information acquisition time from each battery module (10) and calculates measurement time differential information ?t, that is, a time difference between the battery information acquisition time as a reference and the battery information acquisition time of another battery module (10) among the received battery information acquisition times, for each battery module (10). A measurement time correction unit (115) of each battery module (10) corrects a measurement time by the measurement time differential information ?t, using the measurement time differential information ?t received from the relay (20) to adjust the battery information acquisition time of each battery module (10) to the same time.

Abstract: When detecting a fault of a master control device, a slave control device refers to master-device-line information, and obtains line information to establish a connection with the other master control device. The slave control device transmits connection request information to the master control device extracted from the other master control devices. The other master control device determines whether or not it is connectable with the slave control device that has transmitted the connection request information, and transmits a determination result as connectability information. The slave control device switches a communication line to the other master control device when the received connectability information indicates the connectable status.

Abstract: A battery system in which delay in communication and processing is restrained even if the system is constructed with plural hierarchical structures. The system includes a battery module having plural battery cells and a battery module control unit that collects battery information of the plural cells; a battery pack having plural battery modules and a battery pack control unit, which collects information of the plural modules; and a battery block having plural packs and a battery block control unit that collects information of the plural packs. The module control unit and the pack control unit communicate via a first communication line. The pack control unit and the block control unit communicate via a second communication line. The module control unit and the block control unit have a communication line in which direction communication is carried out without having a relay of the pack control unit.

Abstract: When detecting a fault of a master control device, a slave control device refers to master-device-line information, and obtains line information to establish a connection with the other master control device. The slave control device transmits connection request information to the master control device extracted from the other master control devices. The other master control device determines whether or not it is connectable with the slave control device that has transmitted the connection request information, and transmits a determination result as connectability information. The slave control device switches a communication line to the other master control device when the received connectability information indicates the connectable status.