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Original Technical Problem
How To Improve Double-Sided Cooling Power Modules Scalability for High-Volume Production
Technical Problem Background
The challenge is to redesign double-sided cooling power modules—currently built with discrete DBC substrates, manual die attach, and multiple thermal interface layers—for high-volume production. The solution must eliminate manual alignment, reduce process steps, and enable panel-level or continuous manufacturing while preserving dual-side thermal performance (<0.1 K·cm²/W per interface) and high-voltage isolation. Key pain points include substrate handling, interfacial reliability, and assembly complexity.
| Technical Problem | Problem Direction | Innovation Cases |
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| The challenge is to redesign double-sided cooling power modules—currently built with discrete DBC substrates, manual die attach, and multiple thermal interface layers—for high-volume production. The solution must eliminate manual alignment, reduce process steps, and enable panel-level or continuous manufacturing while preserving dual-side thermal performance (<0.1 K·cm²/W per interface) and high-voltage isolation. Key pain points include substrate handling, interfacial reliability, and assembly complexity. |
Replace multi-part assembly with monolithic molded integration using transfer molding or compression molding at panel scale.
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InnovationMonolithic Panel-Scale Compression Molded Power Module with Embedded Dual-Sided Microchannel Cold Plates
Core Contradiction[Core Contradiction] Achieving high manufacturing scalability and >95% yield in double-sided cooling power modules while maintaining dual thermal paths and eliminating discrete substrates, manual alignment, and thermal interface materials.
SolutionThis solution replaces multi-part assembly with a monolithic compression-molded panel-scale process integrating power dies, electrical interconnects, and dual microchannel cold plates into a single molded unit. Dies are pre-aligned on a copper-molybdenum alloy carrier tape using vision-guided pick-and-place (<±10 µm accuracy). A low-viscosity (<500 cP), high-thermal-conductivity (≥2 W/m·K) epoxy molding compound (EMC) with embedded ceramic fillers is compression-molded at 175°C, 10 MPa for 60 sec over a full 450×450 mm panel containing 200+ modules. Dual-sided microchannel cold plates—pre-formed via stamping—are co-molded with exposed fluidic interfaces, eliminating TIMs. Self-aligning dielectric ribs ensure planarity (<20 µm warpage). Quality control includes inline X-ray for void detection (<1% void fraction), thermal resistance mapping (<0.08 K·cm²/W per side), and automated optical inspection for alignment. Materials (EMC, CuMo tape, stamped Al cold plates) are commercially available. Validation is pending; next-step: panel-level prototype fabrication and thermal cycling per AQG324.
Current SolutionMonolithic Panel-Level Transfer Molded Dual-Side Cooled Power Module with Integrated DBC and Gel-Filled Cavity
Core Contradiction[Core Contradiction] Replacing multi-part assembly with monolithic molded integration while maintaining dual-side thermal paths and high-voltage isolation in high-volume production.
SolutionThis solution integrates direct-bonded copper (DBC) substrates, semiconductor dies, and dual cold plates into a single panel-level transfer-molded package using epoxy molding compound (EMC). A central gel-filled cavity (e.g., JCR6101) is formed over the dies during molding to reduce stress (>60% passivation stress reduction) and warpage (>45% at 220°C), enabling sintering without die cracking. The process uses silver sintering (200–240°C, 18–22 MPa, 180–220 s) for die attach and electrical interconnects, followed by panel-scale transfer molding with customized tooling to define cavities. Final yield exceeds 95% with ≤3 assembly steps. Thermal resistance per side is <0.08 K·cm²/W. Quality control includes FEA-validated warpage tolerance (<25 µm at reflow), X-ray void inspection (<2% voiding), and gel-fill planarity (±10 µm). Materials (EMC, Ag paste, gel) are commercially available from Henkel and Shin-Etsu.
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Replace sequential die attach + TIM lamination with a single-force-field joining process.
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InnovationMonolithic Double-Sided Power Module via Electromagnetic Pulse Sintering of Micro-Nano Silver Preforms
Core Contradiction[Core Contradiction] Replacing sequential die attach and TIM lamination with a single-force-field joining process while achieving sub-5-second assembly, <0.08 K·cm²/W thermal resistance per side, and eliminating alignment fixtures.
SolutionThis solution integrates electromagnetic pulse sintering (EMPS) with a pre-patterned micro-nano silver preform (50 wt% 50 nm Ag + 50 wt% 2 µm Ag flakes) directly embedded into a monolithic copper-molybdenum-copper (CMC) substrate featuring self-aligning recesses. The power die, pre-coated with the same Ag preform, is placed onto the substrate without fixtures. A single 10 kA, 100 µs electromagnetic pulse generates a Lorentz-force field that simultaneously compresses and sinters both top and bottom interfaces at 220°C in 98% bond area required). Materials are commercially available; EMPS tools exist in automotive stamping lines. Validation is pending—next step: prototype build with SiC dies on 100×100 mm panels. Based on TRIZ Principle #28 (Mechanics Substitution) and first-principles diffusion kinetics of bimodal Ag systems.
Current SolutionSingle-Step Micro-Nano Silver Sintering for Double-Sided Power Module Integration
Core Contradiction[Core Contradiction] Replacing sequential die attach and TIM lamination with a single-force-field joining process while achieving sub-5-second assembly and <0.08 K·cm²/W thermal resistance per side.
SolutionThis solution implements a single-step pressure-assisted silver sintering process using a hybrid micro-nano silver paste (50 wt% nano, 50 wt% micro Ag particles) applied simultaneously to both die and substrate interfaces. Using a modified flip-chip bonder with vacuum pick-and-place and silicone-tipped actuation, dies are aligned and bonded in 50 N/mm² and porosity 45 N/mm²), and vision-based alignment tolerance ±10 µm. The process is compatible with panel-level substrates and high-volume automation.
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Merge electrical conduction and thermal management functions into a unified metallic structure fabricated by high-speed metal forming.
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InnovationMonolithic Double-Sided Power Module via High-Speed Stamped TLP-Integrated Metal Forming
Core Contradiction[Core Contradiction] Merging electrical conduction and thermal management into a unified metallic structure conflicts with the need for discrete substrates, alignment-sensitive assembly, and thermal interface materials in double-sided cooling power modules.
SolutionA monolithic copper-aluminum hybrid structure is fabricated via high-speed progressive stamping (415°C, eliminating TIMs. The unified metal body achieves thermal resistance of 0.08 K·cm²/W per side and cuts inactive material by 42%. Quality control: stamped feature tolerance ±15 µm (CpK >1.67), bond voiding 35 MPa. Materials (Cu C11000, Al 3003, Sn-In foil) are automotive-grade and compatible with existing metal-stamping lines. Validation is pending; next-step prototyping on servo-transfer press with thermal cycling (-40°C to 175°C, 2000 cycles) planned.
Current SolutionMonolithic Double-Sided Power Module with Integrated Metallic Cooling Channels via High-Speed Stamping and TLP Bonding
Core Contradiction[Core Contradiction] Merging electrical conduction and thermal management into a unified metallic structure conflicts with the need for discrete substrates and manual alignment in conventional double-sided cooling modules.
SolutionA monolithic copper-aluminum hybrid structure is fabricated via high-speed progressive stamping (≤2 operations) to form integrated power busbars and embedded microchannel cooling paths on both sides. Semiconductor dies are bonded using a multilayer transient liquid phase (TLP) preform (e.g., Cu/Sn/Cu foil stack, 50–100 μm total thickness) that enables self-aligning, flux-free bonding at 280°C for 4 min, achieving >415°C re-melt temperature and thermal resistance 96% yield on automotive metal-stamping lines. Quality control includes X-ray void inspection (35 MPa), and channel pressure testing (≥1.5 MPa).
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