The design of the charging gun requires not only the core technical support in the control box, but also reliable material support. The material requires flame retardant, environmental protection, wear resistance, weather resistance, impact resistance, high oil resistance, UV resistance, high and low temperature resistance, etc. The shell material of the charging gun needs to have good high and low temperature resistance to ensure that the charging gun can be used normally in most areas of the country and under various climatic conditions. The material needs to have a high leakage trace index to prevent leakage, and at the same time adopt a safe insulation design. Before it is put into production and use, it must be continuously tested and all performances are qualified before it can be put into use to ensure the personal safety of users. At the same time, the design of charging gun should also take into account the influence of environmental factors. The environment in which the charging gun is used may involve light, wind and rain, gasoline contact, fire danger, severe cold, etc. It needs to go through professional three-prevention design, anti-corrosion design and other protective measures to improve the environmental reliability of the product and ensure the durability of the equipment. Only under these conditions can it maintain its life and maintain good performance, so as to ensure the safety of the charging gun. In addition, the design of the charging gun also needs to consider the safety issues in the details. For example, in the appearance design of the charging gun, there should be necessary operating specifications and warning signs to remind users of safe operation. The handle design of the charging gun should conform to the ergonomic design. The surface texture design should improve the friction force and prevent the sliding hand from falling. At the same time, it also makes the product feel comfortable to the touch, has excellent hand-held grip and is convenient to operate.