Battery device and control method thereof

A battery device, comprising:

• a first battery module including a first battery monitoring circuit and a first assembled battery, the first battery monitoring circuit configured to measure current, voltage, and temperature in the first battery module;
• a second battery module including a second battery monitoring circuit and a second assembled battery, the second battery monitoring circuit configured to measure current, voltage, and temperature in the second battery module, the first and second assembled battery being electrically connected to each other in series between a positive load terminal and negative load terminal;
• and
• a control circuit connected to the first and second battery modules by a communication line and configured to receive information from the first and second battery monitoring circuits via the communication line, wherein
• the first battery monitoring circuit is configured to monitor signals transmitted on the communication line for a predetermined time period after a startup of the first battery monitoring circuit and to detect communication IDs presently being used by another battery module for communications to the control circuit through the communication line during the predetermined period of time and then select a communication ID for transmissions of information to the control circuit that does not conflict with any detected communication ID, and then send the selected ID to the control circuit via the communication line.