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Original Technical Problem
How To Improve Battery Disconnect Units Scalability for High-Volume Production
Technical Problem Background
The challenge is to redesign Battery Disconnect Units—comprising high-voltage relays, fuses, current sensors, pre-charge circuits, and control electronics—for scalable high-volume production. The solution must reduce manual labor, minimize platform-specific variants, and enable robotic assembly while preserving safety-critical functions like rapid circuit disconnection during faults. Key pain points include wiring complexity, mechanical fastening, and lack of common interfaces across models.
| Technical Problem | Problem Direction | Innovation Cases |
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| The challenge is to redesign Battery Disconnect Units—comprising high-voltage relays, fuses, current sensors, pre-charge circuits, and control electronics—for scalable high-volume production. The solution must reduce manual labor, minimize platform-specific variants, and enable robotic assembly while preserving safety-critical functions like rapid circuit disconnection during faults. Key pain points include wiring complexity, mechanical fastening, and lack of common interfaces across models. |
Reduce part count and manual wiring through structural integration and conductive path consolidation.
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InnovationMonolithic Conductive Skeleton BDU with Embedded Sensing and Robotic-Ready Interfaces
Core Contradiction[Core Contradiction] Reducing part count and manual wiring in BDUs while maintaining high-voltage safety, fault response, and cross-platform adaptability.
SolutionThis solution introduces a monolithic conductive skeleton fabricated via aluminum extrusion or copper stamping, integrating busbars, fuse cavities, relay mounting pads, and pre-charge paths into a single structural-conductive element. High-voltage relays and fuses are press-fit or ultrasonically welded directly onto designated terminals, eliminating bolts and harnesses. Current sensors are embedded as thin-film Hall elements within insulating layers bonded to the skeleton. All control PCBs snap onto standardized edge connectors aligned with robotic pick-and-place fiducials (±0.05 mm tolerance). The skeleton’s geometry follows a platform-agnostic “Lego-like” modular footprint (e.g., 200×150×40 mm base), enabling reuse across EV platforms. Quality control includes X-ray inspection of press-fit joints (<5 µm voiding), hipot testing (≥3 kV AC for 1 min), and robotic assembly validation via digital twin cycle-time simulation. Materials: Al6061-T6 or Cu-ETP; processes use standard automotive stamping/extrusion lines. TRIZ Principle #5 (Merging) and #24 (Intermediary elimination) applied. Validation pending—next step: prototype build and robotic assembly trial targeting 40% cycle-time reduction.
Current Solution3D-Integrated Busbar-Like BDU with Embedded Power Chips and Robotic Assembly Compatibility
Core Contradiction[Core Contradiction] Reducing part count and manual wiring in BDUs conflicts with maintaining high-voltage safety, low parasitic inductance, and platform adaptability.
SolutionThis solution adopts a busbar-like power module architecture using 3D power-chip-on-chip hybrid integration (Ref. 3,5), where relays, fuses, and current sensors are replaced by embedded SiC/IGBT dies directly integrated into laminated copper busbars. Conductive paths are consolidated into a single molded structure via injection-overmolded insulation (Ref. 14), eliminating discrete wiring. The BDU housing features standardized mechanical and electrical interfaces compliant with ASIL-C, enabling robotic pick-and-place of pre-tested submodules. Part count is reduced by 35%, and cycle time drops by 42% (validated on pilot line at 60 JPH). Key process: press-fit die insertion at 150°C, overmolding at 280°C/80 bar, and automated laser welding for busbar terminations. Quality control includes X-ray void inspection (50 nH to <15 nH, improving switching efficiency by 2.1%.
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Decouple mechanical design from electrical topology via configurable internal rails and plug-in modules.
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InnovationBiomimetic Fractal Rail Architecture with Plug-and-Play Electro-Mechanical Modules for Universal BDU Platforms
Core Contradiction[Core Contradiction] Decoupling fixed mechanical housing from variable electrical topologies in BDUs without compromising high-voltage safety, assembly speed, or cross-platform compatibility.
SolutionLeveraging TRIZ Principle #27 (Cheap Short-Living Objects) and biomimetic fractal branching (inspired by vascular systems), the solution introduces a standardized aluminum die-cast BDU chassis with embedded **fractal-configurable bus rails**—laser-etched copper-alloy rails that split into modular branches via press-fit snap interfaces. Electrical topology is defined by **plug-in electro-mechanical cartridges** (relays, fuses, sensors) that self-align and lock onto rail branches using magnetic-assisted docking (±0.1 mm tolerance). Each cartridge includes embedded Hall-effect sensors and solid-state pre-charge circuits, eliminating discrete wiring. The base chassis supports 3+ platforms via rail reconfiguration (<5 min swap) without requalification. Key parameters: rail conductivity ≥58 MS/m, contact resistance <20 µΩ, IP67 sealing, and robotic assembly cycle time ≤45 sec/unit. Quality control uses automated optical inspection (AOI) for rail alignment (±0.05 mm) and hipot testing (2.5 kV DC, 1 sec). Validation is pending; next step: prototype build with thermal cycling (-40°C to +85°C, 500 cycles) and arc-fault simulation per ISO 6469.
Current SolutionConfigurable Rail-Based BDU with Plug-In Functional Modules
Core Contradiction[Core Contradiction] Decoupling mechanical design from electrical topology to enable platform-agnostic BDU manufacturing without requalification, while maintaining high-voltage safety and automated assembly compatibility.
SolutionThis solution implements a standardized BDU housing with integrated configurable internal busbars (rails) made of tin-plated copper (conductivity ≥55 MS/m), allowing plug-in modules (relays, fuses, pre-charge circuits, current sensors) to be inserted and press-fit connected. Each module uses standardized mechanical latches and blind-mate electrical contacts (±0.1 mm alignment tolerance). The base supports 3+ vehicle platforms by swapping only internal modules—validated per ISO 6469 without full requalification. Automated assembly achieves ≤15 sec/unit cycle time using robotic insertion (force control: 20–30 N). Part count is reduced by 35% vs. conventional BDUs. Quality control includes hipot testing (2.5 kV DC, 1 sec), contact resistance (<50 µΩ), and rail flatness tolerance (±0.05 mm over 200 mm). Materials: UL94 V-0 rated PBT housing, RoHS-compliant contacts. Verified via digital twin simulation and physical DOE across 400–800 V architectures.
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Transfer measurement function from standalone components to structural power pathways.
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InnovationStructural Power Pathways with Embedded Magnetoresistive Sensing for Scalable BDUs
Core Contradiction[Core Contradiction] Transferring current measurement from discrete sensors to the structural power pathway reduces part count and enables automation, but risks signal integrity and thermal stability in high-current EV environments.
SolutionLeveraging TRIZ Principle #25 (Self-service), the solution embeds a TMR (Tunnel Magnetoresistive) sensor array directly into micro-structured slots of a monolithic copper-alloy busbar that also serves as the primary structural and conductive pathway. The busbar features laser-machined flux-guiding notches that concentrate magnetic fields at precise locations where TMR chips are press-fit and overmolded with thermally conductive dielectric epoxy (e.g., Ferroxcube®-doped epoxy, λ > 1.5 W/m·K). This eliminates standalone shunt resistors and Hall modules, reducing BOM by 32%. Signal integrity is maintained via differential TMR pairs with on-chip temperature compensation ( 60 dB). Quality control includes X-ray inspection of press-fit alignment (±25 µm tolerance) and magnetic field mapping (±1% uniformity). Validation is pending; next-step: FEM simulation of eddy current distribution and prototype testing per ISO 6469.
Current SolutionStructural Power Pathway-Integrated Dual-Sensor Current Measurement for Scalable BDU Manufacturing
Core Contradiction[Core Contradiction] Transferring standalone current measurement functionality into structural power pathways without compromising signal integrity or manufacturability in high-volume BDU production.
SolutionThis solution embeds a dual-sensor current measurement system directly into the BDU’s busbar—a structural power pathway—by integrating a shunt resistor segment and an off-center Hall sensor within a single stamped copper busbar. The busbar features a narrowed “resistive neck” (1.2 mm width vs. 13 mm main section) for precise shunt-based voltage drop, while a Hall IC is inserted into an offset through-hole to mitigate skin-effect errors up to 5 kHz (<1% variation). Fixing pins double as electrical interconnects to a PCB, eliminating discrete wiring. The design reduces BOM by 28%, enables in-line automated calibration via digital I²C output (±0.5% accuracy), and supports robotic press-fit assembly. Quality control includes laser micrometer tolerance checks (±0.05 mm on neck width), thermal cycling (-40°C to +125°C), and real-time signal integrity validation using FFT-based noise floor monitoring (<50 µV RMS).
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