Industrial Safety & Compliance · SOP
Lithium Ion Battery Storage And Thermal Runaway Emergency Protocol
This SOP defines the engineering controls, storage parameters, and emergency response actions required to safely manage lithium-ion batteries and contain thermal runaway incidents in industrial environments. Complies with WorkSafeBC and CSA Z462.
Estimated Time
45 min
Difficulty
Intermediate
Regulation
WorkSafeBC / CSA Z462
Version
1.0
Purpose
Establish a standardized protocol for the safe storage of lithium-ion batteries and the immediate emergency response to thermal runaway events. This procedure protects personnel from toxic off-gassing, arc flash, and explosive cell venting while minimizing property damage and environmental contamination. It ensures compliance with WorkSafeBC Part 5 (Chemical Agents) and CSA Z462 (Electrical Safety).
Scope
This SOP applies to all personnel handling, storing, or working within 15 metres of lithium-ion battery systems (single cells to industrial racks) in Ryxen-serviced industrial facilities, warehouses, and maintenance shops. It covers stationary and mobile battery storage, charging zones, and waste battery quarantine areas. Contractors and temporary workers must receive documented orientation on this protocol before performing any work in battery storage areas.
Safety Precautions
- Lockout/Tagout all connected equipment and isolate battery banks at the rack-level disconnect before any inspection, cleaning, or handling. Verify zero voltage with a multimeter rated for DC system voltage.
- Wear Class D fire-resistant coveralls, a full-face shield with chin guard, Class 0 rubber insulating gloves (rated 1000 V), and dielectric safety boots when handling damaged, swollen, or thermally suspect batteries.
- Ensure the storage area has continuous forced-air ventilation capable of at least 6 air changes per hour, with a dedicated exhaust path to the outdoors. Install fixed gas detectors for hydrogen, hydrogen fluoride, and carbon monoxide.
- Maintain a Class D fire extinguisher (e.g., Lith-Ex, Amerex D) and a lithium-ion fire blanket rated for 1200 °C within 10 m of the storage rack. Do NOT use water, foam, or CO₂ on a thermal runaway event — these agents can accelerate the reaction.
- Store all batteries on non-combustible, liquid-tight secondary containment trays rated for hydrofluoric acid exposure. Inspect containment integrity weekly and after any thermal event.
Required Tools & Materials
- Class D fire extinguisher (e.g., Lith-Ex, Amerex D 30 lb)
- Lithium-ion fire blanket (Firechief or Bridgehill, rated ≥1200 °C) with deployment hooks
- Insulated hand tools: torque wrench (calibrated), cable cutters (rated 1000 V), CAT III/IV digital multimeter with DC clamp
- Thermal imaging camera (resolution ≥160×120, temp range −20 °C to 650 °C) or IR thermometer (laser-sighted)
- Non-conductive spill containment tray or pallet (HDPE or polypropylene, 10 L capacity minimum)
- Emergency venting bollard or stand-alone 12 V explosion-proof exhaust fan for portable use
- Type 2 lockout/tagout kit with 2 padlocks, steel hasp, and 5 write-on tags
- Personal protective equipment: FR coveralls (CAT 2), face shield (ANSI Z87.1, impact-rated), Class 0 rubber gloves (proof-tested 1000 V), dielectric boots (ASTM F2413)
- Communication flare or two-way radio for emergency alert broadcasts
Procedure: Step-by-Step
1
Receive and Inspect. Upon receipt, visually inspect each battery for physical damage, swelling, leakage, or terminal corrosion. Reject any unit showing deformation, fluid escape, or odour. Isolate rejected units in the designated quarantine zone immediately.
2
Pre-Storage Preparation. Clean terminals with a dry, non-conductive cloth; apply dielectric grease per manufacturer specifications. Record the battery model, serial number, charge level (target 30–50 % SOC), and date of receipt in the inventory log.
3
Storage Placement. Place batteries in dedicated non-combustible storage cabinets or on liquid-tight spill containment trays, segregated by chemistry type and nominal voltage. Maintain a minimum 300 mm air gap between stacked rows for natural thermal dissipation. Do not store in sealed enclosures.
4
Environmental Monitoring. Verify the storage area temperature is maintained between 10 °C and 25 °C and relative humidity is below 60 %. Install continuous temperature/humidity monitoring with remote alarming. Log readings every 2 hours on the shift log sheet.
5
Daily Inspection Protocol. Perform a daily visual walkthrough of the storage zone. Use a thermal imaging camera to scan each battery for hot spots exceeding 5 °C above ambient temperature. If any cell surface temperature exceeds 45 °C, isolate it immediately by moving it to the quarantine zone using insulated tools.
6
Thermal Runaway Detection. If gas detection alarms (hydrogen fluoride, carbon monoxide, or hydrogen sensors trigger) or smoke detectors activate, execute immediate emergency evacuation. Do NOT approach a smoking, hissing, or venting battery. Evacuate all personnel to the predetermined rally point.
7
Emergency Response Activation. Activate the facility fire alarm system, call emergency services (911), and announce “Lithium Battery Thermal Runaway — Area Evacuation” over the PA system. Confirm evacuation with a headcount at the rally point. Do not re-enter the zone until cleared by the fire department.
8
Containment and Suppression. From a safe distance of at least 10 metres, deploy the lithium-ion fire blanket over the involved battery rack to contain flames and suppress toxic off-gassing. Use only a Class D extinguisher if flames are visible and the source is accessible. Do NOT apply water, foam, or CO₂.
9
Post-Incident Handling. Allow the battery assembly to cool for a minimum of 24 hours before any handling. Verify core temperature is below 30 °C using a thermal camera. Place the battery into a sealed, non-combustible disposal container lined with vermiculite. Contact a licensed hazardous waste hauler for final disposal.