EV battery packs hold 400-800 V and 50-100 kWh. End-of-life packs are shredded for metal recovery, but damaged cells trigger thermal runaway, releasing HF gas. NFPA 855 governs energy-storage and battery-system fire protection.
Li-ion Chemistry
- NMC: Ni-Mn-Co cathode, 250 Wh/kg
- LFP: Iron phosphate, 160 Wh/kg, safer
- Electrolyte: LiPF6 + EC/DMC/EMC
- Thermal runaway: 80 C SEI, 130 C separator
- Off-gas: HF, CO, CO2, H2, hydrocarbons
Shredder Safety
- N2 inerting: O2 held below 4 percent
- Slurry shredder: Underwater shredding
- Pre-discharge: NaCl tank 48 h
- Scrubber: NaOH for HF washdown
- Speed: 25 rpm slow + 60 kW motor
NFPA 855 Requirements
- Battery unit: 600 kWh max per room
- Spacing: 910 mm rack gap
- Sprinkler: K=160 (11.2) 12.2 L/min/m2
- 2-hour firewall: Separation wall
- Gas detection: H2 25 percent LEL alarm
Thermal-Runaway Response
- Propagation test: UL 9540A cell level
- Mist system: Water mist + dispersant
- F-500 agent: Encapsulation
- Cooling time: 4-8 h
- Reignition watch: 24-48 h monitoring
Turkish Facility Examples
- Exitcom Bursa: 5,000 t/y Li-ion
- Togg Gemlik: Integrated production + recycling
- Regulation: Waste battery decree
- EU: Battery Regulation 2023/1542
- Black mass: Li/Co/Ni hydrometallurgy
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Sources & Further Reading
NFPA 855, UL 9540A, NFPA 400, EU Battery Regulation, FM DS 5-33. NFPA 855 Energy Storage Systems.