Composite Safety Busbar With Friction-Welded Break Section
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Solution Overview
Problem
Conventional busbars are vulnerable to external impact, prone to cracking and breaking, and are expensive due to the use of copper, with complex manufacturing processes and potential scattering of busbar dust or fragments during breakage.
Innovation Solution
A method involving linear friction welding of aluminum and copper conductors, forming a notch in the aluminum conductor, and applying a resin coating to create a lightweight, high-strength busbar that prevents dust scattering and enhances manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper is used to form the busbar, then electrical conductivity is improved, but weight and cost increase
Solution Approach 1:
The busbar is constructed as a composite structure with a copper core providing electrical conductivity and an aluminum cladding layer reducing weight and cost. This composite material approach allows the busbar to achieve the electrical performance of copper while benefiting from aluminum's lightweight properties.
Solution Approach 2:
Different portions of the busbar have different material compositions - the core maintains copper for electrical conduction while the outer surface uses aluminum for weight reduction. This local differentiation of material properties optimizes both electrical performance and mechanical characteristics.
2Reliability
If copper is used to form the busbar, then electrical conductivity is improved, but manufacturing cost increases
Solution Approach 1:
The composite copper-aluminum structure allows manufacturing to leverage the lower cost of aluminum while maintaining copper's electrical properties, thereby reducing overall material cost while preserving electrical conductivity.
Solution Approach 2:
The aluminum cladding provides a cost-effective outer layer that protects the copper core, allowing the use of cheaper material for portions of the structure where extreme electrical conductivity is less critical.
3Reliability
If a narrowed middle is formed for easier disconnection, then overcurrent protection is improved, but structural strength deteriorates
Solution Approach 1:
The busbar features a localized weakened section with reduced thickness or modified geometry at the middle portion, creating a predetermined break point that is structurally weaker than other areas. This local quality change enables controlled disconnection during overcurrent events while maintaining overall structural integrity during normal operation.
4Reliability
If a low-melting point portion is added for overcurrent disconnection, then safety is improved, but device complexity increases
Solution Approach 1:
A specific portion of the busbar is designed with different material properties (lower melting point) compared to the rest of the structure. This localized modification creates a sacrificial element that melts under overcurrent conditions, providing safety functionality without requiring separate components or complex control systems.
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 results in a safer, cost-effective busbar with improved durability and reduced fragmentation, facilitating easier installation and mass production.
Implementation Method 1
performing linear friction welding between the first conductor and the second conductor
Data Source
AI summary
According to an embodiment, a method for manufacturing a safety busbar comprises placing a second conductor on each of two opposite ends of a first conductor, performing linear friction welding between the first conductor and the second conductor, and cutting the first conductor to a predetermined depth.