Apparatus for diagnosing state of battery and method thereof

An apparatus configured to determine a state of a battery, the apparatus comprising:

• a controller configured to execute instruction to perform operations comprising:
• obtaining at least one of first state information including a first state of health (SOH) related to diagnosis of the battery, second state information including a second SOH related to diagnosis of the battery, or third state information including a third SOH related to diagnosis of the battery, and
• determining the state of the battery based on at least one of the first state information, the second state information, or the third state information;
• and
• an output device configured to output the determined state of the battery,
• wherein:
• the first state information further includes a first safety level derived from a number of occurrences of a diagnostic trouble code (DTC) related to overcharge and over-discharge of the battery,
• the second state information further includes a second safety level derived from a resistance, a reactance, and a Warburg impedance of the battery, and
• the third state information further includes a third safety level derived from a voltage change of the battery based on the battery being charged.