ATEX safety in battery factories: what you need to know about lithium powders

Why ATEX certification is essential in battery production

The battery industry processes a range of flammable and in some cases explosive materials. Graphite powders, lithium metal, NMC powders and the organic solvents used in slurry mixing are all potentially hazardous in the presence of an ignition source. Without correct ATEX classification of the production space and equipment, the risk of a dust or gas explosion is real.

Which substances are hazardous in battery production?

Graphite (anode material)

Graphite powders are flammable and can form an explosive mixture in air at sufficient concentration. The minimum ignition energy (MIE) of graphite is low — requiring ATEX Zone 20 or 21 in the immediate vicinity of graphite-processing equipment.

Lithium metal

Lithium metal is pyrophoric: it ignites spontaneously on contact with moisture or air. Processing requires a dry environment (dry room) and fully closed equipment.

NMC, NCA and LFP cathode powders

These materials are less flammable than lithium metal but contain thermally unstable compounds. ATEX Zone 22 typically applies in storage areas.

NMP solvent

NMP is used as a solvent in cathode slurry preparation. It is flammable (flash point 91°C) and requires ATEX zoning in slurry mixing rooms.

ATEX zones in battery factories

• Zone 20: explosive dust atmosphere present continuously or for long periods — inside equipment
• Zone 21: explosive dust atmosphere present occasionally during normal operation — around filling and discharge points
• Zone 22: explosive dust atmosphere present rarely and briefly — wider area around Zone 21, storage areas

Containment AND ATEX: the dual challenge

In battery production, two safety requirements apply simultaneously: OEB containment for health risks from cathode powders and ATEX certification for explosion safety. Equipment must comply with both requirements.

Hecht Technology for ATEX-certified battery installations

We supply big bag handling and bulk transport systems that simultaneously meet OEB containment requirements and ATEX certification requirements. Contact us for an ATEX risk analysis of your battery production installation.