Abstract: The internal structure connection characteristics of used smart phones are the key to study the nondestructive disassembly of used smart phones. Through the dismantling experiments of multiple series of smartphones of three brands of Xiaomi, Huawei and iPhone, a systematic comparative analysis of the internal structure and connection characteristics of the mobile phones was carried out. The advantages and disadvantages and development trends of the structure and connection methods of the three brands of mobile phones were summarized. The structural problems existing in the current dismantling of smart phones and suggestions for improvement are discussed. The overall disassembly of the iPhone is far more difficult than Xiaomi, and Xiaomi is slightly difficult than Huawei. These disassembly experiments provide a powerful support for the trial-manufacture of disassembly equipment for used smartphones and the green design of new smartphones.

Key words: Waste smart phones, Connection method, Structure analysis, Development trend