EV Precision Stamping Technology: Solutions for Temperature Rise and Insulation in High-Current Components

1. Introduction: A Manufacturing Mindset Transformation in EV Stamped Components

As electric vehicles move toward high-voltage architectures, high-voltage busbars are no longer just conductive metal plates but critical system modules integrating power transmission, extreme heat dissipation, and electrical safety. This shift means the stamping industry has evolved from traditional “component manufacturing” to “advanced system integration.” Major supply chains are now seeking strategic technical partners capable of precisely controlling temperature rise while ensuring zero-risk insulation performance.

2. Core Product Solutions: Ensuring Stable Power Transmission in High-Voltage Systems

1. Power Battery Connection Modules: Laser Welding Compatibility and Surface Flatness Control
   Technical Focus: High-precision leveling technology and minimal burr formation during stamping.
   Key Challenge Solved: For busbars connecting battery modules, we ensure perfectly flat and well-aligned components. This enables seamless integration with customers’ automated laser welding processes, preventing welding failures caused by excessive material gaps and ensuring low-resistance connections across the battery pack.

2. Battery Pack Structural Reinforcement: High-Strength Steel Forming and Assembly Tolerance Control
   Technical Focus: Stable forming using high-tonnage stamping machines (160T) and precise multi-hole layout control.
   Key Challenge Solved: For support and protective frames within vehicle battery packs, we process thick high-strength steel materials. Through strict tolerance management, components maintain structural stability even under intense vehicle vibration while ensuring excellent assembly compatibility and improved battery pack integration efficiency.

3. High-Voltage Power Distribution and Fast-Charging Components: Thick Copper Conductor Forming and Low Temperature Rise Solutions
   Technical Focus: Precision bending of thick copper (C1100) and optimized cut cross-section quality.
   Key Challenge Solved: For charging stations and onboard PDU distribution boxes, we supply copper components with thickness exceeding 3.0mm. By optimizing cutting surface quality, we reduce contact thermal resistance and address temperature rise issues during high-current fast charging, ensuring safe power transmission.

4. High-Voltage Insulation Protection Components: Uniform Coating Control and High-Voltage Withstand Performance
   Technical Focus: Electronic-grade powder coating and edge coverage technology.
   Key Challenge Solved: We provide highly reliable insulation solutions as an alternative to heat-shrink tubing for high-voltage transmission components. Uniform coating thickness is ensured even on edges and sharp corners, enabling components to withstand voltages above 2500V without breakdown while optimizing insulation safety distances within compact spaces.

5. Charging Interface and Contact Components: Fatigue-Resistant Elastic Control and Weather-Resistant Surface Treatment
   Technical Focus: Copper alloy forming and high-conductivity wear-resistant plating management.
   Key Challenge Solved: We provide conductive contact components designed for long-term insertion reliability. Through precise springback control during bending, parts maintain stable contact pressure even after thousands of charge and discharge cycles while resisting corrosion from harsh outdoor environments.

3. Expert Technical FAQ

Q1: How can the yield of automated laser welding for high-current busbars be ensured?
Laser welding heavily depends on zero-gap contact between components. We release internal material stress through precision leveling technology and strictly control geometric flatness during the stamping process. This eliminates warping gaps during assembly, improves first-pass yield in automated welding, and prevents localized high resistance caused by incomplete welding.

Q2: Why can burrs on high-voltage component edges threaten system safety?
In high-voltage environments, sharp burrs can trigger corona discharge and may even penetrate insulation layers, causing catastrophic short circuits. Through precise clearance control and secondary burr pressing processes, we ensure smooth and rounded edges. This not only improves powder coating adhesion but is also critical for passing high-voltage withstand tests above 2500V.

Q3: Why is “over 80% shear surface ratio” a key indicator for reducing temperature rise?
The fewer tear surfaces in stamped parts, the smoother the cross-section becomes. This maximizes physical contact area and effectively reduces contact thermal resistance. For high-current applications such as AI servers and EV fast charging, this provides a direct and effective solution for temperature rise control, ensuring stable low-temperature operation even under heavy loads.

Q4: How does deep drawing improve EMI shielding performance?
Multi-stage deep drawing creates a seamless integrated housing that eliminates the micro gaps often produced in multi-piece welded structures. This structural integrity not only meets strict automotive EMC standards but also provides excellent mechanical stability and sealing protection.

Q5: How is stamping springback precisely controlled for high-strength steel components?
We combine CAE mold simulation analysis to calculate springback in advance and incorporate stress compensation and multi-stage buffering techniques into mold design. This offsets the springback characteristics of high-strength materials, ensuring dimensional stability in mass production while maintaining a high standard of Cpk > 1.33.

Q6: What advantages does integrated surface treatment provide for weather resistance?
Vehicle environments involve constant vibration and humidity. By integrating stamping with electronic-grade insulation coating within the same quality system, we ensure components can pass strict salt spray tests and cyclic aging tests, maintaining long-term chemical stability.

Q7: Why is in-die pressure sensing the final safeguard for zero-defect manufacturing?
This technology is central to our quality control system. By detecting abnormal stamping pressure in real time and automatically stopping the machine, we proactively intercept micro defects caused by material variation or mold wear, preventing them from entering the customer’s automated assembly line and fulfilling our commitment to quality.

4. Conclusion: Delivering Professional System Solutions to Create Mutual Value

We will continue optimizing production configurations and technical support to provide customers with more stable and forward-looking technological collaboration, ensuring every project can be executed efficiently and successfully.