ToolFusion
📋 Case Study

Urban EV Fast-Charging Hub with Solid-State Prototype Cells

Zero tolerance for flame, smoke, or HF gas emission within 5 m of pedestrian zone; no precedent in NFPA 855 or UL 9540A for solid-state chemistries

🏗️ Project Overview

1.5 MW fast-charging station with 500 kWh prototype solid-state battery buffer in downtown Seattle

🎯 Challenge

Zero tolerance for flame, smoke, or HF gas emission within 5 m of pedestrian zone; no precedent in NFPA 855 or UL 9540A for solid-state chemistries

🔧 Design Approach

Hermetically sealed vacuum-jacketed modules, fluorinated ketone (FK-5-1-12) suppression, real-time HF gas monitoring with automatic nitrogen purge

📐 Design Diagram

Urban EV Fast-Charging Hub — Solid-State Prototype Cell ModuleSS CellHermetic Vacuum Jacket(Zero permeability barrier)HF SensorN₂ Purge (Q=1.2 m³/min)FK-5-1-12Suppressionṁ_HF = 0.017 g/st_purge = 42 s @ <1 ppmNFPA/UL gap: No precedent for solid-state HF safety protocols

AI-generated project design illustration

📐 Key Calculations

HF Generation Rate Estimate

ṁ_HF = α × E_cell × t_fault
Result: 0.017 g/s
Drove scrubber sizing

Nitrogen Purge Time to <1 ppm HF

t_purge = (V × ln(C₀/C_f)) / Q_N2
Result: 42 s
Met city air quality emergency response threshold

📊 Results

Seattle Fire Department granted conditional occupancy; zero HF exceedance in 14 months

💡 Lessons Learned

  • •Solid-state cells exhibit delayed thermal runaway onset but extreme localized exotherms—requiring sub-module sensing
  • •FK-5-1-12 left conductive residue on busbars; mandated post-discharge deionized water rinse protocol

✅ Key Takeaways

  • 1Solid-state cells exhibit delayed thermal runaway onset but extreme localized exotherms—requiring sub-module sensing
  • 2FK-5-1-12 left conductive residue on busbars; mandated post-discharge deionized water rinse protocol