High-performance cooling assemblies engineered for high-heat-flux power electronics, data center servers, and electric vehicle traction inverters. Combining embedded tube architectures with precision-machined internal microchannels, these hybrid cold plates achieve balanced thermal resistance and fluid pressure drop within strict mechanical envelopes.
Hybrid liquid cold plates integrate traditional tube-embedded fluid paths with machined fin or microchannel surfaces, bridging the performance gap between cost-effective tube designs and high-efficiency direct-brazed manifolds.
Primary Function: Direct thermal dissipation for insulated-gate bipolar transistors (IGBTs), silicon carbide (SiC) power modules, and high-density processor arrays.
Core Advantage: Minimizes thermal bottlenecks while maintaining structural containment integrity for high-pressure coolant loops.
Standard Integration: Custom-profiled baseplates milled from solid stock (Al 6061/1050 or Cu C11000) matched with vacuum-brazed internal turbulence promoters.
Technical Specifications
|
Parameter |
Standard Range / Specification |
Test Standard / Condition |
|
Base Material |
Aluminum (6061-T6, 1050, 6063) / Copper (C11000) |
ASTM B221 / ASTM B152 |
|
Coolant Compatibility |
Water-Glycol (50/50), Dielectric Fluids (PAO, Fluorinerts) |
pH 6.5 – 8.5 (Glycol loop) |
|
Thermal Resistance (Rth) |
0.02 to 0.08 K/W (at 5 L/min) |
ASTM D5470 test bench |
|
Pressure Drop (ΔP) |
< 35 kPa at rated flow rate (2 - 10 L/min) |
Differential pressure transducer |
|
Max Working Pressure |
Up to 1.2 MPa (12 bar) proof pressure |
Hydrostatic pressure test |
|
Burst Pressure |
> 3.0 MPa (30 bar) |
Destructive burst verification |
|
Surface Flatness |
< 0.05 mm across mounting interface |
CMM laser surface scan |
|
Surface Roughness |
Ra ≤ 1.6 μm (mounting zones) |
Stylus profilometer |
Key Features
Optimized Internal Flow Paths:
Custom turbulence fins and offset strip geometries disrupt thermal boundary layers, increasing heat transfer coefficients without exponential pumping power penalties.
Dissimilar Metal Compatibility:
Advanced brazing and diffusion bonding techniques prevent galvanic corrosion when joining copper fluid lines with aluminum structural chassis.
Zero Internal Leak Risk:
Minimized mechanical joints; primary fluid channels formed via vacuum furnace brazing or friction stir welding (FSW).
High Load-Bearing Interface:
Rigid internal support structures prevent plate deformation under high clamping torque from busbars and semiconductor spring clips.
Materials & Options
Base Materials
• Aluminum 6061-T6: Optimal strength-to-weight ratio for EV battery and automotive inverter platforms.
• Aluminum 1050 / 1060: High thermal conductivity (≈ 222 W/m·K) for cost-sensitive volume builds.
• Copper C11000: Maximum thermal conductivity (≈ 391 W/m·K) for extreme heat flux server and laser diode applications.
Surface Finishes
• Chemfilm / Alodine (MIL-DTL-5541): Corrosion protection without compromising electrical grounding.
• Nickel Plating (Electroless, 5 - 15 μm): Prevents oxidation in copper plates and enhances wear resistance.
• Anodizing (Type II / Type III Hardcoat): Electrical insulation and environmental resistance.
Port Configurations
NPT, BSPP, SAE straight thread, quick-disconnect fittings, or custom O-ring face seal integration brazed directly into the plate body.
Manufacturing Process
CNC Machining: High-speed multi-axis milling of fluid channels, internal pockets, and mounting hole patterns from solid plate stock.
Fin Integration: Insertion of corrugated aluminum/copper fins or pin-fin arrays into machined cavity tracks.
Vacuum Brazing: Controlled Atmosphere Brazing (CAB) or vacuum furnace processing using non-corrosive flux or braze filler metals (e.g., Al-Si filler for aluminum, B-CuZn for copper).
Post-Brazing Machining: Secondary finish-milling of semiconductor mounting surfaces to guarantee strict flatness and parallelism tolerances.
Quality Control
Helium Mass Spectrometer Leak Testing: 100% inline testing to detect micro-leaks down to 1 × 10⁻⁹ Pa·m³/s.
Proof Pressure Testing: Every production lot subjected to 1.5× maximum operating pressure hold tests for 60 seconds.
CMM Dimensional Inspection: Automated coordinate measuring machine verification of critical mounting datum points and port locations.
Metallographic Sectioning: Periodic destructive cross-section analysis of brazed joints to verify braze void percentage (< 5% target).
Customization
Tailored outer dimensions, custom hole patterns, and recessed mounting pockets designed around proprietary client enclosures.
In-house CFD (Computational Fluid Dynamics) modeling to predict pressure drop and temperature gradients prior to tooling release.
Rapid prototyping via direct metal laser sintering (DMLS) or CNC-machined split plates with O-ring seals for design validation.
Applications
Electric Vehicle (EV) Powertrains: Traction inverter cooling and onboard fast-charger thermal management.
Data Centers & HPC: Direct-to-chip liquid cooling cold plates for high-core-count CPUs and AI accelerators.
Renewable Energy: Wind turbine and utility-scale solar photovoltaic (PV) inverter cooling.
Industrial Automation: High-power motor drives, induction heating systems, and medical laser diode arrays.
Packaging & Delivery
Packaging: Cleanroom-grade ultrasonic cleaning followed by nitrogen purging, vacuum-sealed barrier bag packaging with desiccant, and heavy-duty custom foam-lined cartons.
Lead Time:
• Prototypes: 2 to 4 weeks from 3D CAD sign-off.
• Volume Production: 4 to 8 weeks depending on tooling and batch size.
• Logistics: Air and ocean freight options with complete export documentation, material test reports (MTR), and inspection certificates included.
FAQ
Q: What is the advantage of a hybrid cold plate over a standard extruded tube cold plate?
A: Extruded tubes offer limited internal fin geometries and fixed flow paths. Hybrid cold plates combine machined base channels with customized internal fins or pin arrays, significantly reducing thermal resistance for high-heat-flux components while allowing complex routing paths.
Q: What is your standard helium leak test threshold for production units?
A: All production cold plates are tested to a baseline threshold of 1 × 10⁻⁹ Pa·m³/s using automated helium mass spectrometer accumulation chambers.
Q: Can you prevent galvanic corrosion when using water-glycol in aluminum-copper hybrid assemblies?
A: Yes. When multi-metal assemblies are required, fluid circuits are isolated, compatible brazing filler metals are utilized, or specialized internal conversion coatings are applied alongside mandatory glycol corrosion inhibitor recommendations.
Q: What information is required to start a custom cold plate design review?
A: Provide your 3D STEP CAD model, maximum heat dissipation load (Watts), coolant type, permissible inlet temperature, maximum allowable pressure drop (ΔP), and flow rate constraints.
Q: Do you perform CFD thermal simulations before building prototypes?
A: Yes. Internal CFD analyses map flow distribution and surface temperature uniformity to ensure designs meet thermal targets before cutting metal.
Q: What is the typical tooling cost and lead time for a custom cold plate?
A: Tooling requirements depend on whether the design utilizes vacuum brazing fixtures or standard CNC extrusion modifications. Tooling lead times typically range from 2 to 3 weeks upon drawing approval.
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