System for automatically assigning ID to slave BMS

A slave BMS comprising:

• a reception unit configured to wirelessly receive a cell balancing start command signal and a temperature measurement command signal at least two times from a predetermined master BMS;
• a cell balancing unit configured to perform cell balancing when a strength of the cell balancing start command signal is greater than a preset strength;
• a temperature measurement unit configured to measure a temperature of a PCB substrate a plurality of times based on the temperature measurement command signal of the at least two times;
• and
• a transmission unit configured to transmit an association signal to the master BMS when a difference between a first temperature and a second temperature, which are temperatures of the battery module measured based on the temperature measurement command signal of the at least two times, is greater than a preset value.

An automatic ID allocation system of an associated slave battery management system (BMS) in a battery rack where a specific master BMS is disposed, the automatic ID allocation system comprising:

• a master BMS comprising:
• a transmission unit configured to wirelessly transmit a cell balancing start command signal and a temperature measurement command signal of at least two times to a plurality of slave BMSs;
• a wired communication unit configured to transmit a FAN ON signal to a plurality of fans connected by wire after the transmission unit wirelessly transmits the cell balancing start command signal;
• a reception unit configured to receive an association signal from an associated slave BMS that is a slave BMS in which a difference value between a temperature of a printed circuit board (PCB) board of a corresponding slave BMS measured based on the temperature measurement command signal transmitted immediately after the cell balancing start command signal and a temperature of a PCB substrate of a corresponding slave BMS measured based on the temperature measurement command signal transmitted after the FAN ON signal transmission among the plurality of slave BMSs is greater than a preset value;
• and
• a control unit configured to determine that the associated slave BMS is disposed in the same rack, and change an ID and communication channel of the associated slave BMS to a specific value;
• and
• a slave BMS comprising:
• a reception unit configured to wirelessly receive a cell balancing start command signal and a temperature measurement command signal at least two times from a predetermined master BMS;
• a cell balancing unit configured to perform cell balancing when a strength of the cell balancing start command signal is greater than a preset strength;
• a temperature measurement unit configured to measure a temperature of a PCB substrate a plurality of times based on the temperature measurement command signal of the at least two times;
• and
• a transmission unit configured to transmit an association signal to the master BMS when a difference between a first temperature and a second temperature, which are temperatures of the battery module measured based on the temperature measurement command signal of the at least two times, is greater than a preset value.