NOVELTY - The apparatus (100) has a voltage measurement part (160) for measuring a voltage value of a battery rack (110). A relay control part (150) obtains a comparison result value through a current comparator (130) based operation state of a main relay (143) and controls operation state of the main relay and a pre-charge relay (141). A current measurement part (120) measures a current value of the battery rack that is compared with a pre-determined current limit value in the current comparator. A voltage comparative part (170) is connected to the voltage measurement part.    USE - Apparatus for protecting damage of a battery rack that is utilized in an electrical appliance. Uses include but are not limited to a mobile apparatus, an electric vehicle (EV), a hybrid vehicle (HV), an energy storage system (ESS) and an uninterruptable power supply (UPS).    ADVANTAGE - The apparatus controls operation state of the main relay and the pre-charge relay to cut-off current flow in the battery rack so as to prevent short phenomenon generated in the battery rack due to overcharge, overheat and fire. The apparatus prevents voltage difference from being exceeded from predetermined allowable voltage difference by controlling the operation state of the main relay so as to prevent capacity unbalance of the battery rack. The apparatus compares the current value of the battery rack with the pre-determined current limit value so as to easily charge and discharge electricity on the battery rack.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a battery rack breakage protecting system    (2) a battery rack breakage protecting method.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of an apparatus for protecting damage of a battery rack that is utilized in an electrical appliance. '(Drawing includes non-English language text)'    Apparatus for protecting damage of a battery rack (100)    Battery rack (110)    Current measurement part (120)    Current comparator (130)    Pre-charge relay (141)    Main relay (143)    Relay control part (150)    Voltage measurement part (160)    Voltage comparative part (170)