The standard requirements for the appearance size of the charging pile chassis processing are mainly based on multiple considerations, including national standards, industry standards, safety specifications, and practical application requirements. The following are some specific standard requirements: 1. National standards and industry standards (1) Power density requirements: According to the requirements of the "Electric Vehicle Conductive Charger" standard, the power density of the DC fast charging pile should not be less than 200W/m ²; the power density of the AC slow charging pile should not be less than 50W/m ². Although this requirement is mainly aimed at the power density, it also indirectly affects the appearance size design of the charging pile chassis to a certain extent, because the internal components need to be reasonably arranged under the premise of ensuring the power density. (2) Electrical Parameters: Different charging pile types (such as DC fast charging, AC slow charging, portable, etc.) have different electrical parameter requirements, such as output voltage, output power, input current, etc. These parameter requirements will affect the structural design and layout of the charging pile chassis, thus indirectly affecting the appearance size. 2. Practical Application Requirements (1) Modularity and Scalability: The design of the charging pile chassis needs to consider modularity and scalability in order to upgrade and expand according to actual needs. Therefore, a certain space and interface need to be reserved in the appearance size to meet possible future demand changes. (2) Heat dissipation and protection: The charging pile will generate a certain amount of heat during the working process, so the chassis design needs to consider heat dissipation. At the same time, in order to ensure the safety and stability of the equipment, it is also necessary to have protective functions such as moisture-proof, mildew-proof, salt spray-proof, etc. These requirements will affect the appearance size and material selection of the chassis to a certain extent. (3) Ease of operation: The appearance size of the charging pile chassis also needs to consider the ease of operation. For example, the height, width and depth of the cabinet need to be moderate so that the user can easily operate and maintain. In addition, the door opening method, button layout, etc. of the cabinet also need to consider ergonomic principles to improve the user experience. III. Specific size examples Take a certain charging pile as an example, its external dimensions may be designed as: (1) Floor-mounted cabinet: The external dimensions may be designed as 2251151400mm (length, width and height), which not only ensures the reasonable layout and heat dissipation requirements of the internal components, but also takes into account the convenience of operation and aesthetics. (2) Wall-mounted cabinet: The external dimensions may be designed as 220100400mm (length, width and height), which is suitable for installation on the wall to save space.