Lithium-Ion Battery Storage & Handling SWMS

Lithium-ion battery storage and handling covers the receipt, stacking, charging, maintenance, transport, and end-of-life management of lithium-ion cells, modules, and battery energy storage systems (BESS) on Australian commercial, industrial, and renewable energy sites. The work introduces unique hazards — thermal runaway, vapour cloud ignition, hydrogen fluoride release, and stranded energy — that standard electrical or chemical SWMS do not adequately address. Under WHS Regulation 2025, any work involving substances or processes with a credible fire or explosion risk is High Risk Construction Work (section 291, Category 4), making a documented SWMS mandatory before work commences. AS/NZS 5139:2019 imposes specific safety requirements on battery system installation and handling, and NCC 2022 Section J prescribes fire separation and ventilation criteria for energy storage enclosures. This SWMS structures the hazard identification, control selection, worker consultation, and emergency response documentation required to discharge the PCBU's primary duty of care under s19 of the WHS Act.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where feasible, specify non-lithium chemistries (flow batteries, sodium-ion) for stationary storage applications during design phase to remove thermal runaway risk entirely
2. 2Elimination — Remove damaged, swollen, or recalled cells from service immediately and quarantine in dedicated outdoor steel bunker pending licensed disposal
3. 3Substitution — Replace high-energy NMC chemistry with lower-energy LFP (lithium iron phosphate) where application allows, reducing thermal runaway propagation rate and peak temperature
4. 4Engineering — Install AS/NZS 5139-compliant battery enclosures with 1-hour fire separation, dedicated mechanical ventilation at 6 air changes/hour, and lower explosive limit (LEL) gas detection
5. 5Engineering — Provide DC isolation, pre-charge resistors, and lockable disconnect switches at module and string level to enable safe de-energisation before any handling task
6. 6Engineering — Deploy aerosol or water-mist fire suppression rated for lithium-ion fires, with thermal imaging cameras for post-incident stranded-energy monitoring
7. 7Administrative — Conduct pre-start briefing using this SWMS, verify battery state-of-charge below 30% before handling, and maintain 1.5 m exclusion zone during energised work
8. 8Administrative — Implement permit-to-work system for any intrusive battery work, with two-person rule, emergency response plan rehearsed quarterly, and incident reporting per WHS Reg s38
9. 9PPE — Issue arc-rated coveralls (ATPV ≥ 25 cal/cm²), Class 0 insulated gloves tested to AS 2225, P3 respirator with acid gas cartridge, and face shield rated to AS/NZS 1337.1
10. 10PPE — Supply self-contained breathing apparatus (SCBA) and chemical splash suits at BESS room entry for emergency responders, inspected monthly per AS/NZS 1715

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

At a 2 MWh commercial BESS retrofit in a distribution centre plant room, the lead electrician opens the pre-start toolbox meeting by walking the three-person crew through this SWMS on a tablet. They identify today's task — replacing two faulty NMC modules flagged by the BMS — and review the thermal runaway, arc flash, and HF off-gas hazard rows. The crew confirms the engineering controls listed: DC isolators are locked open, the BESS room mechanical ventilation is running, the LEL detector reads zero, and the aerosol suppression system is armed. They select PPE per the controls section — arc-rated coveralls, Class 0 gloves, P3 acid gas respirators — and sign on the SWMS register acknowledging the 1.5 m exclusion zone and two-person rule. Mid-task, an apprentice notices one module is slightly swollen and warmer than ambient. Because the SWMS lists swelling as a thermal runaway precursor, the supervisor halts work, evacuates the room, isolates upstream, and follows the emergency response section — calling the site emergency coordinator and moving the suspect module to the outdoor quarantine bunker with thermal imaging monitoring. The SWMS is updated on the tablet with the observation, re-signed, and the variation logged for the principal contractor's HRCW records, demonstrating live use of the document as a working control rather than a filing exercise.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS/NZS 5139 — Battery systems; AS/NZS 4509 — Stand-alone power systems

Frequently asked questions