Copper Stranded Wire
Products Description
copper stranded wire is a high-performance flexible connection material specifically designed for the conductive and flexible connection requirements of latching relays. Its core function is to achieve reliable conductive transmission and dynamic structural adaptability under extremely low contact resistance and high-frequency operation, thereby ensuring stable operation of the relay under harsh conditions such as pulse drive, coil switching, and long cycle life.
In industries such as new energy, automotive electronics, smart meters, rail transportation, and charging modules, magnetic latching relays are continuously evolving towards miniaturisation, high current, and long lifespan. The copper braided wire coupled to these relays must simultaneously possess:
Higher flexibility (meeting mechanical rebound and engagement structure requirements)
Lower resistivity (ensuring minimal pulse energy loss)
Higher fatigue resistance (withstanding millions of cycles)
Higher stability (no failure under harsh environments)
This product was developed based on the above requirements, combining the advantages of both materials and structure, making it suitable for high-end latching relay manufacturers and related suppliers.
Product Essence: From Single Conductor to System-Level Flexible Node
The core of this product is a concentric stranded structure of ultra-fine oxygen-free twisted copper wire, but its engineering value lies in its ability to actively control the force-electric-thermal coupling field within the relay:
Stress Decoupling Interface: The stranded structure forms a discontinuous stress transmission path at the microscopic level. When PCB-level thermal deformation or external mechanical impact acts on the relay pins, the stress wave undergoes multiple reflections and attenuation at the interface between the strands, reducing the effective stress actually transmitted to the solder joint to less than one-tenth of that of a traditional single-core wire.
Current Adaptive Reconfiguration: Multiple independent paths allow for adaptive reconfiguration under transient high current conditions (… For example, under the capacitor charging current at the instant the relay closes, the electromagnetic force generates an instantaneous tightening effect, dynamically increasing the effective conductive cross-section and preventing local overheating; while under steady-state low current, it returns to a loose, low-stress state.
Thermomechanical fatigue isolation: The independent thermal expansion behaviour of each filament forms a buffer in the stranding gap, eliminating the end metal fatigue cracks caused by overall thermal expansion and contraction of traditional conductors under wide temperature cycling.
This design concept elevates the conductor from a passive transmission element to a system mechanical adapter, enabling relay manufacturers to design more compact and lighter body structures without worrying about external stress intrusion.
In-depth Technical Analysis: Why Are Our Stranded Wires More Reliable?
Precise Control of Strand Pitch
Pitch (the length of one strand) is a key parameter determining the performance of flat copper braided wires. While a shorter pitch results in greater flexibility, it increases material costs and length; a longer pitch makes the conductor stiffer, reducing flexibility. Using precision stranding equipment, we calculate the optimal strand pitch based on conductor specifications and application scenarios, achieving a perfect balance between flexibility, structural stability, and cost.
Synergistic Design of Wire Diameter and Number of Strands
We offer a variety of strand count options (e.g., 7-strand, 19-strand, 37-strand, etc.). For the same cross-sectional area, more strands mean a finer wire diameter, resulting in superior flexibility and a higher fatigue limit. Our engineers will recommend the most suitable combination of strand count and copper stranded wire diameter based on the internal space and bending radius requirements of your relays.
The ultimate pursuit of stress uniformity
During the stranding process, we employ a constant tension control system to ensure that each filament bears uniform tension along its entire length. This avoids "overload" or "slack" in some filaments due to uneven tension, ensuring uniform current distribution in all filaments and uniform dispersion of mechanical stress in the overall structure. This is the technological foundation for achieving ultra-long fatigue life.
Materials Philosophy: Building Reliability at the Atomic Level
The nature of materials determines the upper limit of performance.
Precise Oxygen Content Control: We use oxygen-free copper (OFC) or low-oxygen copper as raw materials. Their extremely low oxygen content (typically below 50 ppm) fundamentally eliminates the risk of hydrogen embrittlement. This means that even during welding in a reducing atmosphere, the twisted copper wire will not develop microcracks due to hydrogen atom intrusion, ensuring the intrinsic reliability of the material.
Grain Boundary Engineering: Through precise annealing processes, we control the size and morphology of copper grains to obtain a uniform, equiaxed fine-grained structure. This structure not only provides excellent flexibility but also ensures uniform stress distribution and no weak points when the flat copper braided wire is bent.
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