Copper-Aluminum Composite Terminal for Corrosion-Resistant Cable Connections
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Solution Overview
Problem
The use of copper terminals with aluminum cables is hindered by galvanic corrosion, high cost, and poor structural strength, leading to reliability and stability issues in electrical connections.
Innovation Solution
A copper-aluminum composite terminal with a connecting part made of aluminum or aluminum alloy and a functional part composed of an aluminum-clad copper composite, featuring a copper layer and an outer aluminum layer, optionally with a plating layer, to prevent galvanic corrosion and enhance structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper terminal is directly connected to aluminum cable conductor, then electrical conductivity is achieved, but galvanic corrosion occurs between copper and aluminum leading to increased contact resistance and reliability issues
Solution Approach 1:
The patent applies composite materials by creating a copper-aluminum composite terminal where the connecting part is made of aluminum and the functional part is made of copper, with a transition layer between them. This composite structure eliminates galvanic corrosion by avoiding direct contact between dissimilar metals while maintaining electrical conductivity, thus resolving the contradiction between achieving electrical connection and preventing corrosion.
Solution Approach 2:
The patent introduces a transition layer as an intermediary between the aluminum connecting part and copper functional part. This transition layer acts as a mediator that prevents direct galvanic interaction between copper and aluminum while ensuring continuous electrical conductivity, thereby eliminating the harmful galvanic corrosion effect without compromising the electrical connection.
2Reliability
If copper terminal is used for electrical connection, then good electrical conductivity is achieved, but manufacturing cost increases due to rising copper prices
Solution Approach 1:
The patent applies local quality by making different parts of the terminal from different materials based on their specific functional requirements. The connecting part that contacts the aluminum cable is made of aluminum to match the cable material, while the functional part that requires high conductivity is made of copper. This localized material selection optimizes both electrical performance and manufacturing cost by using copper only where absolutely necessary.
Solution Approach 2:
The copper-aluminum composite terminal uses composite materials to combine the advantages of both metals: aluminum's cost-effectiveness and compatibility with aluminum cables, and copper's superior electrical conductivity. This composite approach reduces overall manufacturing cost compared to using pure copper while maintaining adequate electrical conductivity for the application.
3Object-affected harmful factors
If aluminum alloy terminal is used to match aluminum cable material, then galvanic corrosion is avoided, but structural strength and high temperature resistance deteriorate
Solution Approach 1:
The patent uses composite materials to combine aluminum's corrosion resistance with copper's mechanical strength. The connecting part made of aluminum provides galvanic corrosion resistance by matching the aluminum cable material, while the copper functional part provides superior structural strength and high temperature resistance, thus resolving the contradiction between corrosion resistance and mechanical strength.
Solution Approach 2:
The patent applies local quality by assigning different materials to different parts based on their specific functional needs. The aluminum connecting part provides corrosion resistance where it contacts the aluminum cable, while the copper functional part provides structural strength and thermal resistance where mechanical and thermal performance is critical, thereby resolving the strength-deficiency problem of pure aluminum terminals.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces manufacturing costs, weight, and galvanic corrosion, while improving electrical and mechanical properties, ensuring stable and reliable electrical connections.
Implementation Method 1
there is a significant electrode potential difference between copper and aluminum, when a copper terminal is directly connected to a conductor of an aluminum cable, galvanic corrosion may occur between copper and aluminum under the action of air and water
Implementation Method 2
at least part of a surface of the functional part is provided with a plating layer, a thickness of which is 0.05 μm to 1000 μm
Implementation Method 3
at least part of the copper layer of the functional part is connected to the electric device
Data Source
AI summary
A novel copper-aluminum composite terminal, including a connecting part and a functional part which are connected to each other, the functional part is made of an aluminum-clad copper composite material which comprises an inner copper layer and an outer aluminum layer encapsulating the copper layer, the connecting part is connected to a conductive portion of the aluminum cable, and at least part of the copper layer of the functional part is connected to the electric device. The design of this structure enables weight reduction and cost savings.