Master-slave type battery management system for accurate capacity guage of battery pack

A master-slave type battery management system for accurate capacity gauge of battery packs composed of a plurality of battery sets, including a plurality of battery management units linked to each other via a communication line with each battery management unit linked to a specified rechargeable battery set for managing the specified rechargeable battery set, detecting a physical measurement data from the specified rechargeable battery set and calculating battery set capacity related value based on the physical measurement data, characterized in that:

• each battery management unit is provided with unique battery ID, by assigning a battery management unit having a specified battery ID as a master battery management unit, the rest battery management units become slave battery management units, each slave battery management unit sends the detected physical measurement data and calculated battery set capacity related value to the master battery management unit via the communication line, the master battery management unit detects a physical measurement data from the corresponding rechargeable battery set, calculates a battery set capacity related value, accumulates physical measurement datum from every battery management unit as a battery detected physical data, calculates battery set capacity related values from every battery management unit as a battery capacity related value and sends the battery detected physical data and battery capacity related value to a host connected with the battery management system.