The rapid growth in electric vehicle production is increasing global demand for lithium-ion batteries, bringing to the forefront one of the most critical infrastructure requirements unique to lithium battery production facilities: dry room technology. These specialised production areas, also known as LiBat (Lithium Battery) rooms, require industrial dehumidifier systems designed to operate at extremely low dew point values. Conventional lithium-ion cell production does not handle metallic lithium; the main effects of moisture are hydrolysis of the LiPF₆ salt in the electrolyte, which forms HF, and LiOH and Li₂CO₃ layers on NMC/NCA cathode surfaces. Where metallic lithium is handled (lithium-metal cells, pre-lithiation), the hydrogen released by its reaction with water is an additional safety hazard. For this reason, extremely strict control of moisture content in the production environment is mandatory both for product quality and worker safety.
Lithium battery production cannot be managed with a single humidity level; different production stages require dew point targets that differ markedly from one another. In a typical zoning (23 ± 2 °C), cell assembly, the pouch line, electrolyte filling and dry-room storage are held at 0.3–0.5% RH, i.e. about −40…−45 °C dew point (over ice, frost point); cathode powder, mixing and electrode lines run at 10% RH (≈ −10 °C), and anode processes and coating-cabinet surroundings at 30% RH (≈ +4.5 °C). Exact values are set by the cell chemistry and the manufacturer's specification. This multi-layered structure (requiring separate capacity calculations and independent ventilation integration for each zone) cannot be met by standard air conditioning equipment; silica gel rotor industrial dehumidifiers are indispensable for deep dehumidification.
Silica gel rotor technology operates on the adsorption principle, reaching dew points inaccessible to refrigeration-based systems. This technology, used to go far below the practical lower limit of condensing dehumidifiers (+5°C dP), is applied in LiBat rooms in single-stage or cascade system configurations. Using steam or natural gas for reactivation heat significantly reduces electricity consumption, delivering lasting savings on operating costs. In ventilation system design, variable loads such as room pressure (positive or negative), circulation flow rate, infiltration losses, and personnel transition frequency must also be accounted for.
Selection of a dehumidifier for LiBat rooms must be evaluated not only in terms of capacity but also energy efficiency, system integration flexibility, and long-term service support. Equipment selections made without correctly determining room volume, target dew point, external conditions, fresh air ratio, and process heat loads result in unstable dew point values and product quality deviation during production.
As NKT – Nem Kontrol Teknolojileri, we supply silica gel rotor industrial dehumidifiers for lithium battery production facilities and provide technical support for unit selection, technical service, periodic maintenance and spare parts. Engineering design, installation and commissioning remain within the scope of the facility's designer and contractor. Please contact us through the form below for a facility-specific capacity calculation and unit-selection support.
