Can Bimetallic Terminals Achieve A Reliable Mechanical Fit?

bi metal lugs connectors can achieve a mechanical fit with extremely high reliability. Through a special friction welding process, copper and aluminum are bonded at the molecular level, effectively solving the problems of electrochemical corrosion and inconsistent thermal expansion coefficients that occur when connecting dissimilar metals. Under proper installation, bi metallic cable lugs provides stable mechanical strength and electrical conductivity, making it an industrial-grade standard solution for connecting aluminum cables to copper busbars.

Why are bimetallic terminals the preferred choice for mechanical bonding?

In electrical engineering, directly connecting aluminum wires to copper terminals leads to electrochemical corrosion. Due to the large potential difference between copper and aluminum, a galvanic reaction can occur in humid environments, resulting in increased contact resistance, overheating, and even mechanical failure.

1. Stability of Molecular-Level Bonding

High-performance bimetal cable lug uses friction welding technology. This process does not introduce solder; instead, the heat generated by high-speed rotational friction brings the two metals to a plastic state, achieving tight atomic-level diffusion. This bond strength is typically higher than the strength of aluminum itself.

2. Overcoming Differences in Thermal Expansion and Contraction

Copper and aluminum have different coefficients of thermal expansion. Traditional mechanical crimping is prone to loosening during power load fluctuations. The bimetal terminal lug uses a transition section to buffer this physical stress, ensuring a tight mechanical fit even under long-term thermal cycling.

From Industry to New Energy

In modern power distribution systems, aluminum core cables are widely used to reduce cost and weight, while transformer or switchgear terminals are typically copper.

• Power Substations: Used for connecting large-section aluminum core cables to copper busbars.

• Photovoltaic Power Generation Systems: Bimetallic terminals ensure connection safety under extreme outdoor temperature differences at inverter terminals.

• Energy Storage Battery Cabinets: Provide extremely low contact resistance under high-current charging and discharging environments.

How to Ensure Reliable Mechanical Fit After Installation?

Even with high-quality bimetallic terminals, proper installation procedures are still essential:

1. Matching Crimping Dies: Hexagonal or spot crimping dies that perfectly match the terminal specifications must be used.

2. Applying Conductive Paste: Clean the oxide layer and apply electrical compound grease before crimping to further isolate the wires from air.

3. Torque check: For bolted connections, strictly adhere to the torque standards specified in the technical manual.