02
Building operational resilience
How engineering controls reduce loss potential
Key takeaways
At a glance
This chapter explores the engineering controls that help reduce property loss across lithium-ion battery manufacturing.
You'll learn:
- How engineering controls change across the manufacturing process
- Why protection should reflect the actual production and storage arrangement
- Which warning signs indicate elevated property loss potential
- What resilient battery manufacturing facilities have in common
Three engineering priorities
-
Protection follows the process
Engineering controls should reflect the hazards at each stage of production.
-
Storage matters as much as production
Work-in-progress inventory and rejected-cell management significantly influence loss potential.
-
Design for the actual exposure
Fire protection, water supply and emergency planning should match how batteries are manufactured and stored, not simply how the facility was originally designed.
Strong controls across the manufacturing process
Effective risk management relies on aligning engineering controls with the specific hazards introduced at each stage of production. As batteries move through the manufacturing process, the nature of the exposure changes and so should the protection strategy.
major losses
Slurry preparation
Primary exposures
N-Methyl-pyrrolidone (NMP) solvent vapours, combustible powders, extraction failure and inadequate inerting can create ignitable liquid vapour or powder dust explosion conditions.
Risk management practices
Fire-rated liquid rooms, containment and drainage, secondary containment for transfer systems, nitrogen blanketing, dust collection, exhaust system alarms, and automatic shutdown on loss of inerting.
Coating and drying
Primary exposure
Solvent vapour in ovens and ducts, vacuum or exhaust system failure, overheating.
Risk management practices
Start-up and shutdown interlocks, temperature and pressure monitoring, exhaust system flow measurement, Lower Explosive Limit (LEL) alarms with staged shutdown or purge, local fire detection and suppression systems, and protected exhaust systems.
Electrolyte filling
Primary exposure
Class IC ignitable liquid exposure, leak escalation, oxygen and hydrogen fluoride concerns.
Risk management practices
Two-hour room construction, drainage to emergency tank, LEL and fire detection, oxygen and hydrogen fluoride (HF) monitoring, welded secondary containment for transfer systems, explosion-proof filling systems, ventilation with interlocks to limit vapour accumulation, and remote isolation logic.
Formation and aging
Primary exposure
Charged cells, thermal-runaway events, gas release, long-duration exposure.
Risk management practices
Two-hour chambers, gas, fire and thermal detection, emergency exhaust to a safe exterior route, and local rack, slot or chamber protection designed for the actual arrangement.
Incidental Work-in-Progress storage
Primary exposure
Too much buffer inventory, excessive pile size or height, and high State of Charge (SOC) storage in process areas.
Risk management practices
Clear low-pile limits, 3 metre aisles, controlled footprints, storage height limits, SOC discipline and upgraded protection when batteries move into racks.
Rejected cells
Primary exposure
Accumulation of damaged or defective cells awaiting recycle or discharge.
Risk management practices
Dedicated cut-off room, detached structure or managed outdoor area with separation, direct fire-service access and no exposure to critical process, utility or storage zones. Rejected cells should be discharged as soon as possible.
Practical point: the risk is usually explained by the interaction between process controls, charged inventory, storage arrangement and emergency readiness ‒ not by any single control in isolation.
What resilient facilities have in common
Resilient battery manufacturing facilities are built around protection strategies that reflect the actual manufacturing process, not just the building itself. Effective engineering controls reduce the likelihood that a localised incident develops into a significant property loss.
Non-combustible construction, properly separated ignitable liquid systems and arrangement-specific protection for formation and ageing all contribute to reducing loss potential. Wet-pipe sprinkler systems remain the preferred baseline because speed, simplicity and reliability are critical during fast-moving fire events. Likewise, water supply and hose allowances should always be validated against the actual design basis rather than assumed.
The risk is usually explained by the interaction between process controls, charged inventory, storage arrangement and emergency readiness; not by any single control in isolation.
Warning signs to look for
- Unknown basis of design or reliance on legacy standards without a gap assessment against current dedicated guidance.
- Dry-pipe systems chosen by default rather than as a clearly justified contamination or freezing trade-off.
- High-SOC buffer storage or rack storage treated as incidental when the footprint, height or arrangement no longer qualifies.
- No dedicated area for rejected cells, or slow off-site removal that allows accumulation in process spaces.
- No LEL, thermal, oxygen or hydrogen fluoride (HF) monitoring in electrolyte and cell-finishing zones.
- No pre-incident plan with the fire service and no designated external location for damaged cells.
Key message
View Summary
A well-managed lithium-ion battery manufacturing facility is defined less by scale or automation and more by
disciplined segregation, realistic fixed protection and strict control of charged inventory. The best risks show that
management has turned a complex process into a series of bounded events.
When formation areas, electrolyte systems, WIP limits, rejected-cell handling and emergency response are all credible and aligned with the actual exposure, the risk becomes explainable. When those elements are unclear, loss potential rises sharply ‒ even in modern facilities
Contact Talk to our Risk Engineering specialists
Allen Tsui
