Wireless power transfer method for electric vehicle based on auxiliary battery status and electric vehicle for the same

An electric vehicle (EV) comprising:

• a vehicle assembly (VA) coil for generating a secondary power by receiving a primary power from an EV charging apparatus;
• a high-voltage battery that is charged by using the secondary power generated in the VA coil and supplies power to a power train system of the EV;
• a communication module for controlling wireless charging of the EV by communicating with the EV charging apparatus;
• a controller for controlling the communication module and charging the high-voltage battery by using the secondary power generated in the VA coil;
• an auxiliary battery for supplying power to the controller;
• and
• an auxiliary power supply device that is driven by a secondary jump start power and supplies power to the controller, when a primary jump start power is received from the EV charging apparatus and the secondary jump start power is generated from the primary jump start power at the VA coil.

A wireless charging method based on a state of an auxiliary battery for an electric vehicle (EV) having an auxiliary power supply device, the method comprising:

• driving the auxiliary power supply device by a secondary jump start power generated by receiving a primary jump start power from an EV charging apparatus;
• driving a controller of the EV by a preset power outputted from the auxiliary power supply device;
• charging, by the controller of the EV, an auxiliary battery;
• transmitting, by the controller of the EV, a wireless charging request message requesting to charge a high-voltage battery of the EV to the EV charging apparatus;
• and
• transmitting, by the EV charging apparatus, a wireless charging power according to the wireless charging request message to the EV.