Wireless security device and method, and battery pack

A battery pack comprising:

• a battery module;
• a first battery management system (BMS) comprising a first antenna, and configured to monitor the battery module;
• a second BMS comprising a second antenna, and configured to communicate wirelessly with the first BMS;
• and
• a wireless security device configured to configure the first antenna and the second antenna as a phased array antenna, determine whether a signal received through the phased array antenna satisfies an abnormality criterion, calculate a threat level for the signal based on the signal satisfying the abnormality criterion, and determine a security policy according to the threat level.

A wireless security method of a wireless security device located in a battery pack, the wireless security method comprising:

• estimating an angle of arrival from a signal received through a phased array antenna including a first antenna of a first battery management system (BMS) that monitors a battery module and a second antenna of a second BMS that communicates with the first BMS;
• calculating a beam forming weight that satisfies constraints of maximizing gain in a direction of a target signal and minimizing gain in a direction of an interference signal based on the angle of arrival and a previously estimated channel state information;
• estimating a channel state of the signal;
• calculating a channel change rate based on the channel state;
• and
• determining whether the signal satisfies an abnormality criterion based on the channel state, the channel change rate, the angle of arrival, and the beam forming weight.