Diagnosis apparatus for diagnosing a communication state between a vehicle including a battery and a battery management system connected to a vehicle

A diagnosis apparatus for diagnosing a communication state between a vehicle including a battery and a battery management system (BMS) connected to the vehicle, wherein the diagnosis apparatus is included in the BMS and comprises:

• a controller configured to:
• receive, from the vehicle, a signal;
• compare a period of the received signal to a predetermined reference period;
• compare a width of the received signal to a predetermined reference width;
• and
• determine a communication state and a state of the battery based on the compared period and width of the signal,
• wherein, in response to the period of the signal being the same as the reference period and the width of the signal being the same as a reference width, the controller is configured to determine the communication state to be a normal communication state and the state of the battery to be a normal battery state.