Copper-aluminum composite electric energy transmission system and processing method therefor

A processing method of a copper-aluminum composite electric energy transmission system, comprising:

• a pre-assembling step:
• inserting a section of an aluminum conductor with an insulation layer stripped from an aluminum cable into an electric energy transmission aluminum piece, and pressing the section of the aluminum conductor into the electric energy transmission aluminum piece using a pressing device to form a connecting piece wrapped by the electric energy transmission aluminum piece;
• a welding platform manufacturing step:
• processing an end surface of the copper terminal using to obtain the welding platform, wherein the welding platform protrudes from the end of the copper terminal toward the connecting piece, and the welding platform comprises an end face welded to the connecting piece, a root portion connected to the end of the copper terminal and has a cross-sectional area lager than that of the end face, and a side surface extending obliquely from a peripheral edge of the end face to a peripheral edge of the root portion;
• and
• a welding step:
• welding the copper terminal with the welding platform to the connecting piece, to form a transition layer with metal atoms penetrating into or combined with each other between the end face as well as the side surface of the welding platform and the connecting piece.