A protection device (20) for a battery pack (1) including a battery module (10), the protection device (20) includes: a temperature sensor (211) configured to measure a temperature of the battery module (10); and a control device configured to perform a protection operation of the battery pack (1) if a first temperature value measured through the temperature sensor (211) during a use of the battery module (10) is greater than a first temperature limit value and to correct the first temperature limit value according to a second temperature value measured through the temperature sensor (211) after the protection operation is performed.
