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Original Technical Problem
How To Improve Battery Cold Plates Serviceability Without Weakening Performance
Technical Problem Background
The challenge involves redesigning battery cold plates—critical thermal management components that interface between battery cells and liquid coolant—to enable rapid maintenance or replacement without sacrificing thermal conductivity, introducing leakage paths, or adding excessive weight. The solution must resolve the inherent conflict between modular accessibility (requiring joints/seals) and uninterrupted thermal/fluidic pathways essential for high-performance battery cooling.
| Technical Problem | Problem Direction | Innovation Cases |
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| The challenge involves redesigning battery cold plates—critical thermal management components that interface between battery cells and liquid coolant—to enable rapid maintenance or replacement without sacrificing thermal conductivity, introducing leakage paths, or adding excessive weight. The solution must resolve the inherent conflict between modular accessibility (requiring joints/seals) and uninterrupted thermal/fluidic pathways essential for high-performance battery cooling. |
Decouple mechanical fastening from thermal path optimization through engineered soft-interlayer interfaces.
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InnovationVertically Interlocked Graphite-Solder Hybrid Interlayer for Serviceable Cold Plates
Core Contradiction[Core Contradiction] Decoupling mechanical fastening from thermal path optimization requires eliminating interfacial thermal resistance and leakage risk while enabling repeatable disassembly.
SolutionWe propose an engineered soft-interlayer interface composed of vertically aligned flexible graphite lamellae (5–20 μm thick, in-plane conductivity >1500 W/mK) interleaved with micro-patterned solder layers (Sn-Ag-Cu, 20–50 μm thick). During assembly, low clamping pressure (0.3–0.5 MPa) compresses the interlayer, causing solder to flow into graphite interstices—forming a continuous, low-resistance z-axis thermal path (100 assemblies) with IR thermography and helium leak testing.
Current SolutionVertically Aligned Graphite-Solder Interlayer for Serviceable Cold Plates
Core Contradiction[Core Contradiction] Enhancing serviceability through modular disassembly while maintaining thermal performance and leak-free integrity by decoupling mechanical clamping from thermal conduction paths.
SolutionThis solution integrates a vertically aligned graphite-solder thermal interface material (TIM) between the battery module and cold plate. The TIM consists of alternating layers of flexible graphite (500–1750 W/mK in-plane) and low-melting-point solder (e.g., Sn-Ag), laminated to 150–200 μm thickness. During assembly, a low clamping pressure (30–68 psi) compresses the interlayer, enabling conformal contact without high bolt torque, thus decoupling mechanical fastening from thermal path formation. The vertical alignment ensures z-axis thermal conductivity >25 W/mK, achieving interfacial thermal resistance ≤0.03 cm²·K/W—comparable to brazed joints. Solder layers lock graphite platelets, preventing particle migration and ensuring hermeticity over >100 cycles. Quality control includes surface roughness Ra ≤10 μm, thickness tolerance ±10 μm, and helium leak testing (<1×10⁻⁶ mbar·L/s). Operational steps: clean surfaces → place TIM → apply 0.2 MPa pressure → secure with quick-release clamps. This approach enables <15-min module replacement without coolant leakage or thermal degradation.
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Replace traditional gaskets and bolts with standardized, tool-less fluidic and mechanical interconnects.
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InnovationBiomimetic Gecko-Inspired Dry-Adhesion Cold Plate Interconnect with Integrated Self-Sealing Microvalves
Core Contradiction[Core Contradiction] Replacing traditional gaskets and bolts with standardized, tool-less fluidic and mechanical interconnects without introducing leakage or thermal resistance.
SolutionThis solution replaces gaskets and bolts with a gecko-inspired dry-adhesive interface using micropatterned polyimide pillars (diameter: 10 µm, pitch: 30 µm) on cold plate mating surfaces, enabling reversible, high-conformality contact with interfacial thermal resistance integrated double-shutoff microvalves (stainless steel 316L wave springs, PTFE conical gaskets) that open only upon full mechanical docking, ensuring zero leakage over 200+ cycles. Alignment is guided by kinematic pins (tolerance ±5 µm), enabling blind mating in <8 minutes/module. Quality control includes surface roughness ≤0.2 µm Ra, pillar height uniformity ±1 µm (measured via white-light interferometry), and leak testing at 3× operating pressure (3 bar) per SAE J1401. Materials are commercially available; validation is pending—next-step: thermal cycling (-40°C to +85°C) and vibration testing per ISO 16750-3.
Current SolutionTool-less, Self-Sealing Quick-Disconnect Coupling with Dual Conical Gaskets and Wave Spring for Battery Cold Plate Serviceability
Core Contradiction[Core Contradiction] Replacing traditional gaskets and bolts with standardized, tool-less fluidic and mechanical interconnects without degrading thermal performance or introducing coolant leakage risks.
SolutionThis solution integrates a tool-less quick-disconnect coupling featuring self-sealing poppet valves, dual PTFE conical gaskets, and a wave spring (per reference 1). The coupling enables <10-minute cold plate replacement by hand actuation, eliminating bolts and compressible gaskets. Dual conical gaskets allow free rotation of internal components, minimizing torsional stress on the wave spring—reducing spring height by 50% while maintaining sealing force. Self-sealing valves prevent leakage during disconnection, achieving zero leakage over 200+ cycles at 1.5 MPa operating pressure. Thermal performance is preserved via direct metal-to-metal contact at the interface (thermal resistance <0.08 K·m²/W). Key quality controls: O-ring groove tolerance ±0.05 mm, valve seat flatness <2 µm, leak test at 1.8 MPa for 30 sec (acceptance: zero bubbles). Materials: 316L stainless steel body, PTFE seals, 17-7 PH wave spring—all commercially available.
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Use active material-driven clamping to ensure consistent interfacial contact without manual torque control.
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InnovationActive Material-Driven Self-Conforming Cold Plate Interface with Embedded SMA Clamping and In-Situ Thermal Pad Activation
Core Contradiction[Core Contradiction] Enhancing serviceability through modular disassembly introduces interfacial thermal resistance and coolant leakage risks, degrading thermal performance and reliability.
SolutionThis solution integrates nickel-titanium shape memory alloy (SMA) clamps around the cold plate perimeter that autonomously apply uniform contact pressure (~0.8 MPa) upon resistive heating to 85°C (Af), ensuring consistent thermal interface without manual torque. A shape memory polymer (SMP) thermal pad (Tg = 60°C) is pre-installed between the cold plate and battery module; during reassembly, the SMA clamp heats the SMP, softening it (modulus drops from 1.2 GPa to 8 MPa), enabling conformal filling of surface asperities (self-energizing elastomeric O-rings compressed by the same SMA actuation, achieving leak-tightness (200 cycles. Quality control includes IR thermography for clamp activation uniformity (±2°C) and contact pressure mapping via piezoresistive film (tolerance ±5%). Validation is pending; next-step: thermal cycling prototype testing per ISO 16750-4.
Current SolutionShape Memory Alloy-Actuated Self-Conforming Cold Plate Clamping System
Core Contradiction[Core Contradiction] Enhancing serviceability of liquid-cooled battery cold plates requires modular disassembly, but manual bolted joints introduce variable interfacial contact pressure, risking thermal resistance increase and coolant leakage.
SolutionThis solution integrates nickel-titanium shape memory alloy (SMA) clamping rings around cold plate perimeter interfaces. During reassembly, SMA rings are cooled below martensite finish temperature (Mf ≈ −20°C), enabling low-force placement. Upon heating to austenite finish (Af ≈ 80°C) via embedded resistive traces (12V, 5A, 60s), the SMA contracts radially (~4% strain), generating uniform clamping pressure (1.2–1.5 MPa) without torque tools. This ensures consistent thermal interface contact (100 cycles at 3 bar). Quality control includes verifying Af/Mf via DSC (±2°C tolerance), measuring clamping force with load cells (±0.1 MPa), and helium leak testing (<1×10⁻⁶ mbar·L/s). The system enables <10-minute module swaps while matching monolithic thermal performance.
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