Patent attributes
An embodiment of the present invention provides a battery management system and a switching method thereof, which can prevent fusion of a relay by preventing arcing and voltage spikes when the relay is turned off (opened). To this end, the embodiment of the present invention provides a battery management system including one or more battery packs; a master battery management unit sensing voltages and/or currents of the battery packs; main relays connected between the battery packs and loads and turned on or off by the master battery management unit; and sub relays connected to the main relays in parallel, turned on or off by the master battery management unit and having resistors, wherein when switching occurs in which the main relays are turned off, the sub relays are first turned on and the main relays are then turned off.
