Battery pack, and battery system comprising the same

A battery system, comprising:

• a battery pack that is charged by a charger, comprising:
• an input component to which current and voltage are applied from the charger;
• a current and voltage measurement component configured to measure the current and voltage inputted to the input component;
• an improper charge detector configured to determine whether charging occurs via an improper charging method by comparing a measurement result from the current and voltage measurement component with a reference measurement result corresponding to charging applied by a designated charger;
• a storage component configured to store the measurement result, comprising a current value or a voltage value measured by the current and voltage measurement component, and the reference measurement result corresponding to the charging applied by the designated charger;
• and
• the designated charger, comprising an improper charge detector configured to:
• receive the measurement result from the storage component of the battery pack;
• compare the received measurement result and a second reference measurement result corresponding to charging applied with a specific designated charger;
• and
• determine whether charging occurs via an improper charging method, based on the comparison, wherein
• the improper charge detector performs waveform analysis or frequency analysis on the basis of the measurement result from the current and voltage measurement component.