Electric car charging its methods of communication and exchange of charge pile

The present invention proposes a method of communication AC charging an electric vehicle, comprising: detecting whether charging pole electric vehicle charging gun connection is completed; if the connection is completed, the current value and the voltage value of the battery electric vehicle is acquired, and in accordance with acquired current value and the voltage value calculating charge control parameter, a control amount setting switch charge control parameter; controls the multiplexer charging switch turned on and off according to a switching control amount, to transmit the carrier signal to the charging post; charging pile in receiving carrier signal, the carrier signal is parsed to obtain an electric vehicle charging information. The method can achieve high-power charging, charging the cost reduction, it is conducive to the popularity of electric vehicles, and having a simple type and applicability. The present invention discloses a method and an electric vehicle charging post.