Method for charging an electric vehicle and an electric vehicle charging system

The present invention discloses an electric vehicle charging system and a charging method of an electric vehicle, the system comprising: a smart card, the identity of the user having to identify the electric vehicle user; a first rechargeable battery, a battery having a first information attached to when stored with the UID a second rechargeable battery, a battery having a second information, the second rechargeable battery replacement dead first rechargeable battery;; UID stored electric vehicle, the electric power to the vehicle and a charging station, comprising: a control module, a first acknowledgment rechargeable battery stores the UID, and then allow the second rechargeable battery replacing the first rechargeable battery; an updating unit, the second rechargeable battery replacement when a first rechargeable battery, the UID written into the second rechargeable battery; and a charging set, the charging of the first and second rechargeable batteries. Compared to the conventional charging system of an electric vehicle, the present invention may be more cost savings to the user, provides security mechanisms to a battery or an electric vehicle.