Battery management system and driving method thereof
A battery management system includes at least one slave battery management system and a master battery management system. The slave battery management system outputs a ready signal when power is applied thereto, and the master battery management system provides a synchronization start signal to the slave battery management system in response to the ready signal. The master battery management system periodically provides a synchronization reset signal to the slave battery management system.
1. A battery management system for managing a battery comprising a plurality of battery cells, the battery management system comprising:
a plurality of master/slave battery management systems, each of the master/slave battery management systems comprising a voltage detection unit for measuring a voltage of a corresponding one or more of the battery cells, wherein the plurality of master/slave battery management systems comprises:
at least one slave battery management system for outputting a ready signal when power is applied thereto; and
a master battery management system for providing a synchronization start signal to the at least one slave battery management system in response to the ready signal,
wherein the master battery management system is configured to periodically provide a synchronization reset signal to the at least one slave battery management system.
2. The battery management system of claim 1 , wherein the master battery management system comprises an internal timer that is operated in response to the ready signal.
3. The battery management system of claim 1 , wherein the master battery management system comprises an AND gate configured to receive the ready signal.
4. The battery management system of claim 1 , wherein the at least one slave battery management system each comprises an internal timer that is operated in response to the synchronization start signal.
5. The battery management system of claim 1 , wherein the at least one slave battery management system each comprises an internal timer that is reset to a reference time in response to the synchronization reset signal.
6. The battery management system of claim 1 , wherein each slave battery management system of the at least one slave battery management system is configured to provide a synchronization check signal to the master battery management system in response to the synchronization start signal or the synchronization reset signal.
7. The battery management system of claim 6 , wherein the synchronization check signal comprises a battery voltage control signal used for measuring a voltage of the corresponding one or more of the battery cells coupled to the slave battery management system.
8. The battery management system of claim 6 , wherein the master battery management system is configured to output a system fault signal when the synchronization check signal is not received.
9. The battery management system of claim 6 , wherein the master battery management system comprises an AND gate configured to receive the synchronization check signal.
10. A method for driving a battery management system for managing a battery comprising a plurality of battery cells, the battery management system comprising a plurality of master/slave battery management systems, each of the master/slave battery management systems comprising a voltage detection unit for measuring a voltage of a corresponding one or more of the battery cells, the plurality of master/slave battery management systems comprising a master battery management system and at least one slave battery management system, the method comprising:
assigning the corresponding one or more of the battery cells to each of the master battery management system and the at least one slave battery management system;
determining whether the master battery management system receives a ready signal from the at least one slave battery management system;
providing a synchronization start signal from the master battery management system to the at least one slave battery management system in response to the ready signal; and
periodically providing a synchronization reset signal from the master battery management system to the at least one slave battery management system.
11. The method of claim 10 , wherein the master battery management system comprises an internal timer and operates the internal timer when outputting the synchronization start signal.
12. The method of claim 10 , wherein the master battery management system provides the synchronization start signal in response to the ready signal from each of the at least one slave battery management system.
13. The method of claim 10 , wherein the at least one slave battery management system each comprises an internal timer, and operates the internal timer in response to the synchronization start signal.
14. The method of claim 10 , wherein the at least one slave battery management system each comprises an internal timer and forcibly resets the internal timer to a reference time in response to the synchronization reset signal.
15. The method of claim 10 , further comprising determining whether a synchronization check signal is received from each slave battery management system of the at least one slave battery management system after providing the synchronization start signal or the synchronization reset signal.
16. The method of claim 15 , wherein the synchronization check signal comprises a battery voltage control signal used for measuring a voltage of the corresponding one or more of the battery cells coupled to the slave battery management system.
17. The method of claim 15 , further comprising outputting a system fault signal from the master battery management system when the synchronization check signal is not received from the at least one slave battery management system.