Bend-flexible Cable Reinforcing Layer Bending Radius
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Solution Overview
Problem
Electrical cables, particularly charging cables for electric vehicles, face mechanical damage due to frequent bending stresses and weather-related loads, leading to potential malfunctions, especially in control lines with small cross-sections that are less robust than supply lines.
Innovation Solution
A flexible electrical cable design featuring a conductive core with a reinforcing layer of spirally wound strands, which limits the bending radius by overlapping support surfaces, preventing damage and enhancing mechanical protection, electromagnetic shielding, and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cable is made flexible with stranded conductors, then the cable can be moved and bent for connecting moving units, but the control lines with small cross-sections are more susceptible to mechanical damage when bent below minimum bending radius
Solution Approach 1:
The reinforcing layer is pre-installed around the conductive core before the cable is put into service. This preliminary structural reinforcement ensures that when the cable is bent, the minimum bending radius is maintained from the outset, preventing mechanical damage to the control lines before it can occur.
Solution Approach 2:
The reinforcing layer changes the mechanical parameters of the cable by introducing a structural element that actively resists bending below a certain radius. The layer's rigidity parameter creates a physical constraint that maintains the bending radius above the critical threshold, protecting the conductors while preserving flexibility within acceptable ranges.
2Strength
If a rigid protective layer is added to prevent bending damage, then the cable's mechanical strength is improved, but the cable's flexibility is reduced
Solution Approach 1:
The reinforcing layer is designed as a thin, flexible structure that provides mechanical reinforcement without creating excessive rigidity. This thin-film approach allows the cable to maintain sufficient flexibility for movement and bending within the permissible range while still providing the necessary structural support to prevent damage at critical bending radii.
Solution Approach 2:
The reinforcing layer modifies the cable's mechanical parameters by introducing a controlled rigidity that only activates when the bending radius approaches the minimum threshold. Within the normal operating range, the cable remains flexible, but near the critical limit, the reinforcing layer's structural properties prevent further bending, thus resolving the contradiction between strength and flexibility.
Data Source
AI summary
A flexible electrical cable is provided that extends in a longitudinal direction and contains a conductive core, with a reinforcing layer for limiting a bending radius mounted around the conductive core. The reinforcing layer is formed from at least one strand wound around the conductive core, which has winding sections with support surfaces. The support surfaces of adjacent winding sections are supported on each other to limit a bending radius.