Wireless communication method in battery pack and master BMS providing the method

1. A master battery management system (BMS) for performing wireless communication with a slave BMS according to a frequency hopping method in a battery pack, the master BMS comprising:

a communicator configured to receive first channel scan information generated by scanning a plurality of channels belonging to a frequency bandwidth used in the wireless communication by a device disposed outside the battery pack;

a channel analyzer configured to generate second channel scan information by scanning the channels belonging to the frequency bandwidth;

a storage configured to store a reference signal to noise ratio (SNR) value on the wireless communication; and

a controller configured to select a hopping channel used in the frequency hopping method based on the first channel scan information and to calculate a signal intensity of the selected hopping channel based on the second channel scan information and the reference SNR value.

2. The master BMS of claim 1 , wherein:

the first channel scan information includes a first noise intensity of each of the respective channels, and

the controller is further configured to compare the first noise intensity and a reference value, and to select a channel having the first noise intensity that is less than the reference value from among the channels as the hopping channel.

3. The master BMS of claim 1 , wherein:

the first channel scan information includes a first noise type and a first noise intensity of each of the respective channels, and

the controller is further configured to compare the first noise intensity and a reference value, and to select a channel from among the channels that has the first noise intensity less than the reference value, and that does not include noise predetermined as the first noise type as the hopping channel.

4. The master BMS of claim 1 , wherein:

the second channel scan information includes a second noise intensity of each of the respective channels, and

the controller is configured to calculate a signal intensity satisfying the reference SNR value on the second noise intensity and to set the calculated signal intensity as the signal intensity of the hopping channel.

5. The master BMS of claim 1 , wherein:

the controller is configured to generate a hopping sequence of the frequency hopping method based on the hopping channel and the signal intensity of the hopping channel, and to perform synchronization with the slave BMS based on the hopping sequence so that the master BMS is disposed in a same hopping channel at a same time with the slave BMS.

6. The master BMS of claim 1 , wherein:

the frequency bandwidth includes a frequency bandwidth to which an industrial scientific medical (ISM) band belongs.

7. A wireless communication method for a master battery management system (BMS) in a battery pack to perform a wireless communication with a slave BMS according to a frequency hopping method in a battery pack, the method comprising:

receiving first channel scan information generated by scanning a plurality of channels belonging to a frequency bandwidth used in the wireless communication by a device outside the battery pack;

selecting a hopping channel used in the frequency hopping method based on the first channel scan information;

calculating a signal intensity of the hopping channel based on second channel scan information generated by scanning the channels belonging to the frequency bandwidth in the battery pack and a reference signal to noise ratio (SNR) value on the wireless communication; and

generating a hopping sequence of the frequency hopping method based on the signal intensity of the hopping channel and the hopping channel.

8. The wireless communication method of claim 7 , wherein the selecting of the hopping channel includes:

comparing a first noise intensity of each of the channels included in the first channel scan information with a reference value, and

selecting a channel having the first noise intensity that is less than the reference value from among the channels as the hopping channel.

9. The wireless communication method of claim 7 , wherein:

the first channel scan information includes a first noise type and a first noise intensity of each of the respective channels; and

the selecting of the hopping channel includes:

comparing the first noise intensity of each of the respective channels with a reference value, and

selecting, from among the channels, a channel having the first noise intensity that is less than the reference value and not including noise predetermined as the first noise type as the hopping channel.

10. The wireless communication method of claim 7 , wherein the calculating of the signal intensity of the hopping channel includes:

calculating a signal intensity satisfying the reference SNR value in a second noise intensity of the hopping channel included in the second channel scan information, and

setting the calculated signal intensity to be the signal intensity of the hopping channel.

11. The wireless communication method of claim 10 , further comprising:

after the generating of the hopping sequence of the frequency hopping method, performing synchronization with the slave BMS based on the hopping sequence for the master BMS to be positioned in a same hopping channel at a same time as the slave BMS.

12. The wireless communication method of claim 7 , wherein:

the frequency bandwidth includes a frequency bandwidth to which an industrial scientific medical (ISM) band belongs.