Current Rod Assembly for Low-Resistance High-Temperature Contacts
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Solution Overview
Problem
High-temperature electrochemical devices, such as solid-oxide fuel cells and electrolyzers, face issues with electrical conduction due to flatness defects at the contact surfaces between the copper core and the whistle, leading to increased electrical resistance and thermal dissipation, which can cause material degradation and loss of contact integrity.
Innovation Solution
A method for manufacturing an electrical conductor using a core of copper, a sheath of stainless steel or nickel alloy, and a whistle of stainless steel, assembled through crimping, crimping and brazing, or braze-welding, with hot isostatic pressing to ensure mechanical strength and electrical conductivity, overcoming the limitations of prior art by providing a robust and efficient electrical conduction device resistant to high-temperature oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If TIG welding and hot isostatic pressing are used to assemble the copper core and whistle, then the assembly achieves good mechanical strength, but flatness defects at the contact surfaces increase electrical resistance and cause thermal dissipation
Solution Approach 1:
The assembly process is segmented into distinct operations: TIG welding for structural attachment, followed by separate hot isostatic pressing for defect elimination. This segmentation allows each process to optimize for its specific function without compromising the other.
Solution Approach 2:
The hot isostatic pressing process, initially used only for mechanical bonding, is leveraged to eliminate flatness defects and improve electrical contact. The same process that provides mechanical strength also removes harmful surface irregularities, converting a potential limitation into a dual-benefit solution.
2Ease of manufacture
If traditional assembly methods are used, then manufacturing is simple, but the electrical contact surface has flatness defects leading to high ohmic resistance
Solution Approach 1:
The hot isostatic pressing process changes physical parameters (temperature, pressure, time) to transform the contact surface quality. By applying controlled thermal and mechanical parameters, the process eliminates flatness defects while maintaining assembly simplicity.
3Reliability
If the copper core is directly exposed, then electrical conductivity is high, but resistance to oxidation at high temperature is poor
Solution Approach 1:
The assembly creates a composite structure where copper core and whistle work together. The copper core provides high electrical conductivity while the whistle, positioned at the contact surface, provides oxidation resistance. This composite approach allows both materials to contribute their superior properties to the overall assembly.
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 solution achieves a stable and efficient electrical conduction with reduced ohmic resistance and improved mechanical strength, ensuring the integrity of the contact and extending the service life of the assembly under high-temperature operating conditions.
Implementation Method 1
assembling the sheath and the core, in particular by fitting, the assembly of the sheath on the first portion of the core being carried out by hot isostatic pressing
Implementation Method 2
assembling the core and the whistle by crimping, or by crimping and brazing, or by braze-welding, or by brazing
Data Source
AI summary
A method for manufacturing an electrical conductor, such as a current rod, comprising the following successive steps: —providing a core made of a first metallic material, —providing a sheath made of a second metallic material, the sheath being intended to cover a first part of the core, —providing a connection terminal made of a third metallic material, —assembling the core and the connection terminal, by crimping, or by crimping and brazing, or by braze welding, or by brazing, —assembling the core and the connection terminal with the sheath.