A method for setting sequential identification to a multi-slave battery management system in a battery pack, the battery pack including N slave battery management systems having sequential physical locations to control a battery module containing at least one battery and a main battery management system to control the N slave battery management systems, the method comprising: the main battery management system transmitting a trigger signal to a first slave battery management system to initialize ID setting; the first slave battery management system receiving the trigger signal and transmitting ID information of the first slave battery management system to the main battery management system and the trigger signal to a next slave battery management system; sequentially performing a process of receiving the trigger signal and transmitting slave battery management system ID information to the main battery management system and the trigger signal to a next slave battery management system throughout the second slave battery management system to the N-1 th slave battery management system (20-(n-1)); and the N th slave battery management system (20-n) receiving the trigger signal and transmitting ID information of the N th slave battery management system (20-n) to the main battery management system; wherein N is a natural number of 2 or more; and characterized in that: the main battery management system transmitting an ID allocating signal to a slave battery management system having not transmitted slave battery management system ID information within a predetermined time to allocate new ID information; and the slave battery management system setting ID information of the slave battery management system in response to the ID allocating signal and transmitting the ID information of the slave battery management system to the main battery management system. the main battery management system transmitting a trigger signal to a first slave battery management system to initialize ID setting; the first slave battery management system receiving the trigger signal and transmitting ID information of the first slave battery management system to the main battery management system and the trigger signal to a next slave battery management system; sequentially performing a process of receiving the trigger signal and transmitting slave battery management system ID information to the main battery management system and the trigger signal to a next slave battery management system throughout the second slave battery management system to the N-1 th slave battery management system (20-(n-1)); and the N th slave battery management system (20-n) receiving the trigger signal and transmitting ID information of the N th slave battery management system (20-n) to the main battery management system; wherein N is a natural number of 2 or more; the main battery management system transmitting an ID allocating signal to a slave battery management system having not transmitted slave battery management system ID information within a predetermined time to allocate new ID information; and the slave battery management system setting ID information of the slave battery management system in response to the ID allocating signal and transmitting the ID information of the slave battery management system to the main battery management system.