BATTERY SYSTEM AND CONTROL METHOD THEREOF

Disclosed is a battery system including: a battery module (10) including a plurality of battery sub modules (11) connected in parallel between system terminals (T+, T-); a plurality of switches (33) connected in series to the plurality of battery sub modules (11), respectively; a measuring unit measuring voltage values of the battery module and/or cells included in the battery module and current values which flow on the battery modules; a detecting unit determining whether or not an internal short occurs in the plurality of battery sub modules by monitoring the voltage values or the current values; and a control unit (23) controlling, when the internal short occurs in at least one battery sub module of the plurality of battery sub modules (11), at least one switch corresponding to the at least one battery sub module among the plurality of switches (33) in a non-conductive state.