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Original Technical Problem
How To Improve Battery Cold Plates Scalability for High-Volume Production
Technical Problem Background
The challenge is to redesign battery cold plates—currently made via brazing or complex extrusion—to enable scalable, high-throughput manufacturing without compromising thermal performance, structural integrity, or leak-tightness. The solution must reduce or eliminate joining operations, simplify tooling, and align with automotive mass-production principles such as stamping, roll-forming, or single-stage forming.
| Technical Problem | Problem Direction | Innovation Cases |
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| The challenge is to redesign battery cold plates—currently made via brazing or complex extrusion—to enable scalable, high-throughput manufacturing without compromising thermal performance, structural integrity, or leak-tightness. The solution must reduce or eliminate joining operations, simplify tooling, and align with automotive mass-production principles such as stamping, roll-forming, or single-stage forming. |
Replace multi-part assemblies with a **single-piece stamped architecture** that creates sealed coolant paths through controlled plastic deformation.
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InnovationSelf-Sealing Monolithic Cold Plate via Dual-Stage Stamping with Controlled Plastic Instability
Core Contradiction[Core Contradiction] Achieving leak-tight, high-performance coolant channels in a single-piece stamped cold plate without brazing or welding, while enabling >10 parts/minute press-line throughput.
SolutionThis solution uses dual-stage progressive stamping on 3xxx-series aluminum sheet (e.g., AA3003-H14, 1.2 mm thick) to form sealed serpentine coolant channels through controlled plastic instability. In Stage 1, shallow channel preforms are stamped with tailored strain gradients. In Stage 2, localized hydro-pneumatic pressure (8–12 MPa) induces controlled buckling at channel interfaces, causing opposing walls to plastically interlock and self-seal via micro-welding from asperity collapse—eliminating brazing. TRIZ Principle #25 (Self-Service) is applied: the part creates its own seal during forming. Process runs at 12 strokes/minute on standard servo presses. Quality control: helium leak testing (<1×10⁻⁶ mbar·L/s), flatness ≤0.15 mm over 600 mm, and thermal performance ≥85% of brazed baseline (ΔT ≤3°C at 15 L/min, 50°C coolant). Validation is pending; next-step: prototype stamp trials with in-die pressure monitoring and post-form CT scanning for seal integrity.
Current SolutionSingle-Piece Stamped Cold Plate with Self-Sealed Coolant Channels via Controlled Plastic Deformation
Core Contradiction[Core Contradiction] Replacing multi-part brazed/welded cold plates with a single-piece stamped architecture that forms sealed coolant paths without secondary joining operations, while maintaining leak integrity and thermal performance in high-volume production.
SolutionThis solution uses progressive die stamping of 3003-H14 aluminum sheet (0.8–1.2 mm thick) to form complementary raised ribs on both sides of a single blank. During stamping, ribs are precisely aligned so that when the sheet is folded or pressed against itself (e.g., in a U-channel configuration), the mating rib interfaces create interference-fit sealed coolant channels through controlled plastic deformation—eliminating brazing or welding. The process runs at >12 parts/minute on standard automotive press lines. Channel depth: 0.6–1.0 mm; hydraulic pressure rating: ≥1.5 MPa; leak rate: <1×10⁻⁶ mbar·L/s (helium sniff test). Quality control includes optical metrology for rib height tolerance (±0.05 mm) and automated pressure decay testing. Thermal performance: heat transfer coefficient ≥850 W/(m²·K) at 5 L/min flow. Tooling uses common stamping dies with localized trim features to modulate flow resistance per zone, enabling design adaptability without new tooling.
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Shift from batch-based brazing to **continuous roll-forming + inline laser welding**, drastically improving throughput and material utilization.
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InnovationBiomimetic Serpentine Microchannel Cold Plate via Continuous Roll-Forming and In-Line Pulsed Laser Welding
Core Contradiction[Core Contradiction] Achieving high thermal performance and leak-tightness in battery cold plates while enabling high-throughput, low-cost, and adaptable manufacturing.
SolutionThis solution replaces batch brazing with a continuous roll-forming process that imprints a biomimetic serpentine microchannel (inspired by vascular networks) directly onto 3003-H14 aluminum coil (0.8–1.2 mm thick). The formed strip is seam-welded inline using pulsed fiber laser welding (1070 nm, 2–4 kW peak power, 50–200 Hz pulse frequency, 2–5 m/min line speed) to seal the channel, eliminating filler material. Key parameters: gap tolerance ≤0.1 mm, weld penetration 80–100% of sheet thickness, heat input 95% material utilization, supports rapid tooling changeover (<2 hrs) for platform variants, and meets EV thermal specs: ΔT <3°C across 1.2 m², pressure drop <15 kPa at 10 L/min. Based on TRIZ Principle #25 (Self-Service) and #24 (Intermediary Elimination), it removes brazing flux, fixtures, and secondary machining. Validation is pending; next-step: prototype testing under thermal cycling (−40°C to +85°C, 500 cycles).
Current SolutionContinuous Roll-Formed Aluminum Cold Plate with Inline Laser-Welded Seam
Core Contradiction[Core Contradiction] Achieving high-throughput, low-cost cold plate production requires eliminating batch brazing, but maintaining leak-tightness and thermal performance demands robust, defect-free joints.
SolutionThis solution replaces multi-step brazing with continuous roll-forming of 3xxx/6xxx aluminum coil into a serpentine channel profile, followed by inline laser welding of the longitudinal seam. A CO₂ or fiber laser (8–10 kW) welds at 4–6 m/min with 0.1–0.2 mm joint gap, using no filler for autogenous lap joints. Pre-heating (300–400°C) and post-weld annealing (via induction, 450°C) minimize residual stress and hardness mismatch. The process achieves >95% material utilization, throughput >20 m/min, and leak rates <1×10⁻⁶ mbar·L/s (helium sniff test). Tolerances: ±0.1 mm flatness, ±0.05 mm seam alignment. Quality control includes real-time pyrometry, seam vision inspection, and eddy-current testing. Tooling changeover for new vehicle platforms takes <4 hours via modular roll cassettes. This approach reduces cost by 35% vs. brazed plates while meeting EV thermal specs (ΔT <3°C across 1.2 m² area at 15 L/min flow).
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Optimize extrusion die geometry to embed turbulence promoters and mounting features, reducing need for post-processing.
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InnovationBiomimetic Sharklet-Embedded Monolithic Aluminum Extrusion for Self-Turbulating Cold Plates
Core Contradiction[Core Contradiction] Embedding turbulence promoters and structural mounting features into a single aluminum extrusion without post-processing, while maintaining flow uniformity, thermal performance, and leak-tightness.
SolutionLeveraging TRIZ Principle #25 (Self-Service) and biomimetics, the extrusion die integrates **Sharklet-inspired micro-grooves** (50–200 µm depth, 0.5–1.5 mm pitch) directly into internal channel walls to induce controlled turbulence (Re > 3000 at 8 L/min), eliminating need for inserted turbulators. Simultaneously, **snap-fit mounting bosses** and **thread-forming ribs** are co-extruded using a multi-orifice mandrel with variable land lengths (optimized via CFD-driven die balancing). Material: AA6063-T5 aluminum; extrusion speed: 1.2–1.8 m/min; billet temp: 490±5°C. Quality control: inline laser profilometry (±10 µm tolerance on groove geometry), helium leak testing (<1×10⁻⁶ mbar·L/s), and IR thermography for thermal uniformity (ΔT < 2°C across plate at 5 kW/m² heat flux). Validation is pending; next-step: prototype extrusion + flow loop testing per SAE J2344. This monolithic approach cuts part count by 70% and eliminates brazing/machining, aligning with automotive high-volume stamping-compatible assembly.
Current SolutionMonolithic Aluminum Cold Plate with Die-Integrated Turbulence Promoters and Mounting Features via Optimized Extrusion
Core Contradiction[Core Contradiction] Embedding internal turbulence promoters and structural mounting features in a single aluminum extrusion without post-machining or brazing, while maintaining thermal performance and leak-tightness.
SolutionThis solution leverages a streamlined porthole extrusion die with embedded mandrel geometries that form serpentine coolant channels containing integrated vortex generators (0.5–1.2 mm height) and through-die-formed mounting bosses. Using AA3003 aluminum billet at 480–520°C and ram speed of 1.5–2.5 mm/s, the process achieves net-shape cold plates requiring no welding or plugging. CFD-optimized die land lengths ensure flow balance (velocity deviation 50% versus brazed alternatives.
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