Battery discharge control system including a battery saver for motor-driven vehicle and battery discharge control method using the battery saver for motor-driven vehicle

1. A battery discharge control system of a motor-driven vehicle, comprising:

an auxiliary battery configured to supply electric power to a plurality of electric components, a vehicle controller, and a wireless communication module;

a battery state of charge (SOC) monitoring unit configured to monitor a SOC of the auxiliary battery; and

a battery saver configured to cut off electric power supply from the auxiliary battery to the plurality of electric components, the vehicle controller, and the wireless communication module based on a predetermined turn-off priority order and SOC information of the auxiliary battery provided from the battery SOC monitoring unit,

wherein the plurality of electric components includes:

a second electric component comprising a door lock module, a trunk lead lock module, a clock, and an audio memory which are always-on power components, and

a first electric component other than the always-on power components, and

wherein the battery saver is configured to cut off the power supply from the auxiliary battery to the second electric component after cutting off the power supply to the first electric component.

2. The battery discharge control system of claim 1 ,

wherein the battery saver is configured to:

turn off the first electric component when the SOC of the auxiliary battery is less than a first reference value,

turn off the wireless communication module when the SOC of the auxiliary battery is less than a second reference value which is smaller than the first reference value,

turn off the vehicle controller when the SOC of the auxiliary battery is less than a third reference value which is smaller than the second reference value, and

turn off the second electric component when the SOC of the auxiliary battery is less than a fourth reference value which is smaller than the third reference value.

3. The battery discharge control system of claim 1 ,

wherein the wireless communication module is configured to communicate with a predetermined external terminal to visually or audibly inform that the first electric component is turned off, when the SOC of the auxiliary battery is less than a first reference value.

4. The battery discharge control system of claim 3 ,

wherein when the SOC of the auxiliary battery is less than a second reference value which is smaller than the first reference value, the wireless communication module is configured to:

communicate with the predetermined external terminal to visually or audibly inform at least one of a method for restarting a vehicle or a method for resetting the auxiliary battery before turning off the second electric component.

5. The battery discharge control system of claim 1 , further comprising: an auxiliary battery reset unit configured to reset the auxiliary battery.

6. The battery discharge control system of claim 5 ,

wherein when the auxiliary battery is reset and the SOC of the auxiliary battery exceeds a first reference value, the battery saver is configured to:

first turn on the second electric component, and

perform a control of sequentially turning on the vehicle controller, the wireless communication module, and the first electric component.

7. A battery discharge control method of a motor-driven vehicle, the method comprising:

monitoring, by a battery state of charge (SOC) monitoring unit, a SOC of an auxiliary battery;

confirming, by a battery saver, whether a vehicle is turned off; and

when the vehicle is turned off, cutting off, by the battery saver, electric power supply from the auxiliary battery to a plurality of electric components, a vehicle controller, and a wireless communication module based on a predetermined priority order, and the monitored SOC of the auxiliary battery,

wherein the plurality of electric components includes:

a second electric component comprising a door lock module, a trunk lead lock module, a clock, and an audio memory which are always-on power components, and

a first electric component other than the always-on power components, and

wherein cutting off the electric power supply comprises: first cutting off the electric power supply to the first electric component and then cutting off the electric power supply to the second electric component.

8. The method of claim 7 , wherein:

when the SOC of the auxiliary battery is less than a first reference value, the first electric component is turned off,

when the SOC of the auxiliary battery is less than a second reference value smaller than the first reference value, the wireless communication module is turned off,

when the SOC of the auxiliary battery is less than a third reference value smaller than the second reference value, the vehicle controller is turned off, and

when the SOC of the auxiliary battery is less than a fourth reference value smaller than the third reference value, the second electric component is turned off.

9. The method of claim 7 , further comprising: when the SOC of the auxiliary battery is less than a first reference value, visually or audibly informing, by a wireless communication module, that the first electric component is turned off.

10. The method of claim 9 , further comprising: when the SOC of the auxiliary battery is less than a second reference value smaller than the first reference value, visually or audibly informing, by the wireless communication module, at least one of a method for restarting a vehicle or a method for resetting the auxiliary battery when the second electric component is turned off.

11. The method of claim 10 , further comprising:

when a reset process of the auxiliary battery is executed by the method for resetting the auxiliary battery, charging the auxiliary battery by a high voltage battery.

12. The method of claim 11 ,

wherein after charging the auxiliary battery and when the SOC of the auxiliary battery exceeds at least the first reference value, first turning on the second electric component, and sequentially turning on the vehicle controller, the wireless communication module, and the first electric component.