Blog Details
Precision manufacturing trends for charging terminals and pins
Published Time:
2025-06-26
Charging terminals and pins, as core components of high-voltage connectors, are developing a trend towards precision manufacturing focusing on high performance, high reliability, and low cost. This is mainly reflected in the following aspects
As core components of high-voltage connectors, charging terminals and pins are trending towards precision manufacturing focused on high performance, high reliability, and low cost, mainly reflected in the following aspects:
1. Material Upgrades
High Conductivity and Corrosion Resistance:
Copper alloys are mainstream (such as beryllium copper, chromium zirconium copper), evolving towards silver-nickel alloys and gold/silver composite plating, reducing contact resistance (<1mΩ) and resisting arc oxidation.
Base Material Substitution: Applications of hybrid materials such as aluminum-plated copper (30% weight reduction) and copper-clad steel (20% cost reduction).
Insulating Materials:
High-temperature engineering plastics (such as LCP, PEEK) replace traditional PA, with temperature resistance increasing from 120℃ to 200℃+ (suitable for 800V high voltage).
2. Precision Machining Processes
Micron-Level Precision:
Stamping/turning precision reaches ±5μm (traditional ±20μm), pin roundness error <0.01mm, ensuring stable contact after tens of thousands of insertions.
Laser Fine-tuning: Replaces chemical etching, achieving nanometer-level removal of burrs on the terminal surface (Ra<0.2μm).
Integrated Molding:
Insert Molding integrates metal terminals and plastic housings in a single molding process, reducing assembly tolerances and improving sealing (IP68).
3. Intelligent and Automated Production
Full-Process Automation:
Online inspection using machine vision (e.g., PIN pin coplanarity <0.05mm), AI sorting of defective products (defect detection rate >99.9%).
Digital twin simulation of stamping parameters to reduce trial-and-error costs (e.g., material rebound compensation algorithm).
Flexible Manufacturing:
Quick mold change (<5 minutes) supports small-batch production of multiple models (e.g., customized liquid-cooled terminals).
4. Stricter Testing and Verification
Dynamic Performance Testing:
Simulates vehicle vibration (20G acceleration), mechanical shock (more than 1000 insertions) and the resulting change in contact resistance (ΔR<10%).
Environmental Aging: Salt spray test >500 hours, high temperature and humidity (85℃/85% RH) cycle 1000 times.
5. Green Manufacturing
Cyanide-free plating: Uses environmentally friendly plating processes (such as thiosulfate silver plating) to reduce heavy metal pollution.
Material Recycling: Closed-loop reuse of copper scraps (recovery rate >95%) to reduce carbon emissions.
Industry Pain Points and Breakthrough Directions
Pain Points: High-end plating equipment (such as those from Japan's Hirata) relies on imports; low yield rate (<80%) for miniature terminals (<1mm²).
Breakthroughs: Domestic magnetron sputtering film deposition technology and ultra-precision stamping machine tools (such as those from Suzhou Baoxin) are gradually replacing imports.
Summary
The manufacturing of charging terminals and pins is evolving towards higher precision, stronger environmental adaptability, and more intelligent production. Domestic enterprises need to make breakthroughs in material formulas, equipment processes, and testing standards to meet the needs of the high-voltage fast-charging era.
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