Conductive Particles for Aluminum Wire Oxide Penetration
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Solution Overview
Problem
Aluminum conductors form a tightly adherent, poorly conductive oxide layer when exposed to the atmosphere, making it difficult to establish reliable electrical connections, especially during crimping operations, as the oxide layer must be penetrated to achieve a sufficient electrical and mechanical bond, which is challenging for larger diameter wires with multiple conductors.
Innovation Solution
Applying conductive particles in an axial direction between the electrical conductors within the wire bundle, allowing them to engage and enhance the inter-wire bonds and electrical connections, even after the wire is constructed, simplifying the process and improving conductivity by penetrating the oxide layers during crimping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aluminum conductors are used to reduce cost and weight, then manufacturing cost and weight are reduced, but electrical conductivity deteriorates due to oxide layer formation
Solution Approach 1:
Conductive particles are introduced as an intermediary substance between aluminum conductors to facilitate electrical connection. These particles penetrate the oxide layer and establish conductive pathways, mediating the electrical connection between conductors that would otherwise be blocked by the insulating oxide layer.
Solution Approach 2:
The electrical conductivity parameter is improved by introducing conductive particles that change the local electrical properties at the conductor interface. The particles alter the effective conductivity by creating conductive bridges through the oxide layer, transforming the electrical connection quality.
2Weight of moving object
If aluminum conductors are used to reduce weight, then weight is reduced, but electrical conductivity deteriorates due to oxide layer formation
Solution Approach 1:
Conductive particles serve as a mediator that enables electrical connection between aluminum conductors without requiring removal of the oxide layer. The particles penetrate through the oxide barrier and establish conductive pathways, allowing the lightweight aluminum conductors to maintain their weight advantage while achieving reliable electrical conductivity.
3Reliability
If conductive particles are applied to enhance electrical connections, then electrical conductivity improves, but device complexity increases due to additional application steps
Solution Approach 1:
Conductive particles are applied to the conductor surfaces before the crimping operation. This preliminary action ensures that the particles are already in position to penetrate the oxide layer and establish conductive pathways when the crimping force is applied, integrating the conductivity enhancement into the existing manufacturing process flow.
Solution Approach 2:
The conductive particles are designed to automatically penetrate the oxide layer and establish conductive pathways when subjected to the crimping force. The particles self-organize and self-position at the conductor interfaces during the normal crimping operation, eliminating the need for separate particle application or activation steps.
4Strength
If conductive particles are applied to improve bonding during crimping, then bonding strength improves, but device complexity increases due to additional application steps
Solution Approach 1:
Conductive particles are applied to the conductor surfaces before the crimping operation. This preliminary action ensures that the particles are already in position to enhance bonding when the crimping force is applied, integrating the bonding enhancement into the existing manufacturing process flow without requiring separate application steps.
Solution Approach 2:
The conductive particles are designed to automatically enhance bonding when subjected to the crimping force. The particles self-organize and self-position at the conductor interfaces during the normal crimping operation, eliminating the need for separate particle application or activation steps while improving bonding strength.
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 conductive particles improve both the bonding strength and electrical conductivity between conductors and the crimp barrel of the terminal, effectively forming transverse current paths and enhancing the reliability of electrical connections by breaking through oxidation layers, thus addressing the challenges posed by aluminum's oxide layer.
Implementation Method 1
the first and second conductors are then wound around each other so that the applied conductive particles are pressed into the surfaces of the conductors
Implementation Method 2
the conductive particles providing an electrical connection between the corresponding electrical conductors engaged by the conductive particles
Data Source
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AI summary
An electrical wire (100) includes a bundle of electrical conductors (102) that has an end segment (110) that extends to an end (108) of the bundle. Each electrical conductor in the bundle engages at least one other electrical conductor. The electrical wire also includes conductive particles (106) disposed between and engaging at least some of the electrical conductors in the bundle along the end segment. The conductive particles are configured to provide an electrical connection between the corresponding electrical conductors engaged by the conductive particles.