Charging system and method for electric vehicle

A system for charging an electric vehicle, the system comprising;

• a user terminal;
• a management server;
• and
• a charging device;
• wherein:
• the user terminal is configured to transmit a location information of the user terminal to the management sever;
• the management sever is configured to determine at least one usable charging device in response to the location information;
• the management sever is configured to transmit information about the at least one determined charging device to the user terminal;
• the user terminal is configured to select at least one charging device among the at least one determined charging device;
• the user terminal is configured to transmit a preemption request information for preemption of the chosen at least one charging device to the management server;
• the management sever is configured to transmit a preemption command signal to the at least one charging device corresponding to the preemption request information to lock the at least one charging device;
• the management server is configured to generate authentication information in response to the preemption request information from the user terminal;
• the management sever is configured to transmit information about a user of the user terminal to a locked charging device;
• the locked charging device is configured to store the information about the user;
• the locked charging device is configured to unlock upon receiving the information about the user and the authentication information;
• and
• based on a determination that a communication failure has occurred, storing, by the unlocked charging device is configured to store information acquired during a charging process and transmit the information acquired during the charging process to the management server when communication is resumed.