Abstract: Electric vehicles have currently emerged as a crucial means to tap the carbon reduction potential in transportation and enhance the transportation electrification level. They also represent an important way to achieve the " Double Carbon" goals. However, at present, the charging process of electric vehicles faces certain challenges, including a complicated charging process and easy disclosure of privacy information. To simplify the identity authentication process and ensure that privacy information remains secure from leakage or tampering during charging, we propose a lightweight plug-and-charge scheme. This scheme includes identity authentication and privacy information encryption based on the domestic charging communication protocol GB/T 27930 and the international plug-and-charge standard ISO 15118. Since there is no confidential communication between the vehicle/pile and the corresponding operator, a lightweight vehicle-pile-cloud tripartite security identity authentication scheme is constructed based on multiple national secret encryption algorithms. To ensure the security of CAN protocol communication between piles, a Diffie Hellman (DH) encryption channel with optimized precomputation is established. To address the issue of identity information being susceptible to theft and tampering during the charging handshake stage between vehicles and piles, the national secret algorithm SM4 is employed to establish the encryption process of sensitive information. Through simulation analysis, it is evident that the proposed scheme exhibits high security, low time delay, reduced communication and computing costs, and can meet the requirements for non-inductive charging as well as plug-and-charge functionality.