Aluminum is prone to forming a dense oxide layer in the air, which has strong insulation properties while being protected from corrosion. In order to make good electrical connections, it is necessary to damage the oxide layer during terminal crimping. The key breakthrough at this point is to improve the original groove type pressure bar of the terminal crimping part to a "serrated" or "conical convex point" pressure bar. This structure can puncture the oxide layer on the surface of the aluminum wire during crimping, establish good metal contact between the metal aluminum below and the terminal surface, and achieve reliable connection. At the same time, the "serrated" or "conical convex point" pressure bar structure increases the crimping contact area, Improved terminal crimping and pull-out force.