A system for connecting a battery, the system comprising: a relay unit connectable to a battery by a current; a first resistor and a second resistor which are connected to the relay unit and are positioned in parallel; a first driving unit provided in a connection path of the relay unit and the first resistor and a second driving unit provided in a connection path of the relay unit and the second resistor; a detecting unit configured to detect force applied to a circuit from the outside; and a control unit configured to control driving of the first driving unit and the second driving unit based on the detected force applied to the circuit from the outside, wherein the first resistor and the second resistor are configured to determine a total resistance value according to whether the first driving unit and the second driving unit are driven, and thus changing an intensity of a current flowing in the relay unit according to the total resistance value, so that a connection of the relay unit to the battery is maintained or blocked, wherein the first resistor has a larger resistance value than that of the second resistor, and in order to allow a current having a minimum intensity for maintaining the connection of the relay unit to the battery to flow in the relay unit when only the first driving unit is driven, the first resistor has a resistance value having a size corresponding to the current having the minimum intensity, characterised in that, when the detecting unit does not detect the force, the control unit is configured to drive only the first driving unit, so that the current having the minimum intensity flows in the relay unit and the connection of the relay unit to the battery is maintained by the current having the minimum intensity, when the detecting unit detects the force and the detected force is equal to or smaller than a predetermined reference value, the control unit is configured to drive both the first driving unit and the second driving unit, so that a current larger than the current having the minimum intensity flows in the relay unit by a parallel resistance value of the first resistor and the second resistor which are connected in parallel, and the connection of the relay unit to the battery is maintained by the larger current than the current having the minimum intensity, when the detecting unit detects the force and the detected force exceeds the predetermined reference value, the control unit is configured not to drive both the first driving unit and the second driving unit, so that a current does not flow in the relay unit and the connection of the relay unit to the battery is blocked. a relay unit connectable to a battery by a current; a first resistor and a second resistor which are connected to the relay unit and are positioned in parallel; a first driving unit provided in a connection path of the relay unit and the first resistor and a second driving unit provided in a connection path of the relay unit and the second resistor; a detecting unit configured to detect force applied to a circuit from the outside; and a control unit configured to control driving of the first driving unit and the second driving unit based on the detected force applied to the circuit from the outside, wherein the first resistor and the second resistor are configured to determine a total resistance value according to whether the first driving unit and the second driving unit are driven, and thus changing an intensity of a current flowing in the relay unit according to the total resistance value, so that a connection of the relay unit to the battery is maintained or blocked, wherein the first resistor has a larger resistance value than that of the second resistor, and in order to allow a current having a minimum intensity for maintaining the connection of the relay unit to the battery to flow in the relay unit when only the first driving unit is driven, the first resistor has a resistance value having a size corresponding to the current having the minimum intensity, characterised in that, when the detecting unit does not detect the force, the control unit is configured to drive only the first driving unit, so that the current having the minimum intensity flows in the relay unit and the connection of the relay unit to the battery is maintained by the current having the minimum intensity, when the detecting unit detects the force and the detected force is equal to or smaller than a predetermined reference value, the control unit is configured to drive both the first driving unit and the second driving unit, so that a current larger than the current having the minimum intensity flows in the relay unit by a parallel resistance value of the first resistor and the second resistor which are connected in parallel, and the connection of the relay unit to the battery is maintained by the larger current than the current having the minimum intensity, when the detecting unit detects the force and the detected force exceeds the predetermined reference value, the control unit is configured not to drive both the first driving unit and the second driving unit, so that a current does not flow in the relay unit and the connection of the relay unit to the battery is blocked.