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Help CenterComplete Technical Solution for Four Layer/multi-layer Aluminum Based Thick Copper PCB for China Chaosheng Electronics New Energy Vehicles
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Thick copper multi-layer aluminum based PCB
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Complete Technical Solution for Four-Layer/Multi-Layer Aluminum-Base Thick Copper PCB in New Energy Vehicles
1. Product Definition
Four-layer aluminum-based thick copper PCB: Featuring a 6061/5052 aluminum alloy as the underlying heat dissipation substrate, it incorporates a 4-layer stacked circuit structure with power/ground layers utilizing ≥3oz thick copper foil (industry standard for thick copper: copper thickness ≥105μm). This automotive-grade high-power metal base circuit board excels in four core capabilities: high-current load capacity, rapid thermal conduction, multi-layer signal isolation, and reliability under harsh automotive conditions. It can be extended to 6/8/12-layer aluminum-based thick copper boards for more complex electronic control integration modules.
II. Standard Stack Structure (4-Layer Classic Automotive Stack)
1) Four-Layer Aluminum Base Standard Stack (Top to Bottom)
1. Top Layer Signal Layer: Thick copper circuit (2~4oz), component soldering, low-voltage signal acquisition
2. Inner Layer GND Ground Plane: Full thick copper plane, shielding interference, auxiliary heat dissipation
3. Inner Layer Power Layer: Extra-thick copper (3~6oz), main power high-current loop
4. Bottom Layer Insulating Thermal Conductive Medium Layer
5. Aluminum Metal Base Layer (6063 Aluminum Alloy, substrate thickness 1.0~2.0mm) Principle: The aluminum base serves as a passive heat sink, with dual-layer thick copper planes forming a three-dimensional heat dissipation channel, while the ground plane isolates electromagnetic interference from the power loop on BMS sampling signals.
2) Multi-Layer Expansion (6/8/12 Layers) Signal layers, power layers, and multiple ground planes are interleaved, utilizing blind buried holes, buried copper blocks, and thermal-electrical separation processes, suitable for multi-integrated electronic control boards (OBC+DC-DC+motor drive triple integration). III. Automotive Grade Core Technical Parameters (For New Energy Vehicles)
(1) Substrate and Thermal Conduction System
1. Aluminum Base Board: 6061 aluminum alloy, thickness 1.0/1.5/2.0mm, thermal conductivity ≈200W/m・K, passivated treatment with salt spray resistance >500h
2. Thermal Conductive Insulating Medium: Ceramic-filled high thermal conductivity PP, thermal conductivity 2.0~4.0W/m・K, Tg≥200℃, UL94 V-0 flame retardant, breakdown voltage ≥4kV/mm, compatible with vehicle 400V high-voltage platform
3. Conventional FR4 Multi-Layer Core Board: Used for signal layers, with aluminum base heat dissipation areas laminated only in power zones (partitioned aluminum base composite board, cost-reduction solution)
(4) Reliability Testing Standards (AEC-Q200 Automotive Grade)
• Temperature Cycling: -40°C ↔ 125°C, 1,000 cycles without delamination
• Random Vibration: 10~2000Hz, 15g acceleration, 2 hours without pad detachment
• High-Temperature Aging: 150°C for 1,000 hours, thermal resistance drift ≤±0.1W/m・K
• Withstand Voltage: Dielectric layer withstands 4kV high voltage for 1 minute without breakdown IV. Precision Application Scenarios in New Energy Vehicles
1. Onboard OBC (Onboard Charger) (Most Common): 4-layer aluminum substrate with 3~4oz thick copper, AC-DC high-power rectification, addressing fast charging heat issues
2. High-Low Voltage DC-DC Boost/Buck Module: Multi-layer aluminum substrate with thick copper, high-current power conversion, direct heat dissipation via aluminum substrate to shell
3. Motor Controller IGBT Drive Board: 6~8-layer aluminum substrate with 6oz ultra-thick copper, capable of carrying peak currents exceeding 100A 4. BMS Battery Management System Power Mainboard: 4-layer board with ground layer shielding against high-voltage interference, thick copper for high-current sampling points
5. Vehicle High-Voltage Distribution Box, PTC Heater Drive Board V. Core Advantage Comparison (Standard FR4 4-Layer Board vs. Aluminum Substrate Thick-Copper 4-Layer Board)
1. Current Carrying Capacity: Thick copper + aluminum substrate cooling enhances current capacity by 3~5 times, reducing I²R heat loss by 70%, eliminating high-current board burnout risks
2. Thermal Efficiency: Aluminum substrate heat conduction is over 800 times that of FR4, directly dissipating IGBT hotspots, reducing component temperature rise by >20°C, extending power tube lifespan
3. Electromagnetic Compatibility (EMC): Multi-layer complete ground plane + metal aluminum shell shielding suppresses power switch EMI interference, meeting automotive EMC national standards 4. Environmental Tolerance: Resistant to severe vehicle vibration, drastic temperature fluctuations, engine compartment oil, moisture, and steam, with significantly lower failure rates than standard PCBs
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