For high-precision research in Sodium-Ion (SIB) and Lithium-Sulfur (Li-S) batteries, a Mini Industrial-Grade Dryroom (also called a "Mini-Environment") is often a superior alternative to both a standard glovebox and a full-scale walk-in dryroom. It provides an encapsulated, ultra-dry workspace that can house multiple pieces of equipment
An industrial-grade mini-dryroom is defined by its ability to maintain "Desert-Dry" conditions under load. (1) Dew Point Control: Typically maintains -40°C to -60°C (less than 1% RH). For moisture-sensitive Sodium-Ion materials (like Prussian Blue), a stable -50°C dew point is the industry benchmark. (2) Cleanliness: Usually rated at ISO Class 6 or 7 (Class 1,000 to 10,000) to prevent metallic particle contamination during cell assembly. (3) Temperature Stability: Precision control at 21°C ± 1°C. This is vital for maintaining the viscosity and dosing accuracy of electrolytes during vacuum filling. (4) Pressure Management: Maintains a positive pressure (approx. 20–30 Pa) relative to the lab to prevent humid ambient air from leaking in through gaskets or door seals.
| Part Number |
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| Critical Targets |
- Dryroom Space: L8m*W3m*H2.2m (larger or smaller can be customized according to equipment occupancy)
- Dew point: -40°C (other dew points can be achieved by choosing appropriate dehumidifier and water chiller).
- Two Operators (more operators can be accommodated upon request for customization)
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| Dehumidifier Features |
- AC380V±10%, three-phases, 50/60Hz, 29.9 kW (total)
- Dehumidifier: 20.4 kW (two heating regenerators, 11.5+8.9 kW)
- Temperature Control in Dryroom: 5 kW (Heating + Cooling)
- Regeneration & Processing Fan: 4.5 kW
- Supply Air Volume: 3000 m3/h
- Fresh Air Volume: 1000 m3/h
- Exhaust Air Volume: 300 m3/h
- Regeneration Temperature: 130 °C (recommended).
- HMI touch screen to monitor and control all operation parameters.
- The dehumidifier system is shown below for reference.
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| Water Chiller Features |
- AC380V±10%, three-phases, 50/60Hz, 34.8 kW (total)
- Air cooled type, R134a refrigerating medium
- Scroll Compressor: 11.05 kW and rated current 32 A.
- Condenser (surface area/row): 1.92/3 r
- Water Pump Power: 1.1 kW
- Inlet and outlet water temperature: 12°C and 7°C, respectively.
- Tank Volume: 130 L
- Dimension: L1500mm * W780mm * H1600mm
- The water chiller is shown below for reference.
 
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| Dryroom Box Features |
- Inner Dimension: L8m*W3m*H2.2m
- Box Frame: high-strength galvanized steel structure Q235 (anti-corrosion treatment)
- Inside Wall Material: 50mm thick color steel plate (outer beige PVDF coated steel plate + rockwool/paper honeycomb core material)
- Air Shower Room: inner stainless steel + outer spray
coating structure, equipped with HEPA efficient filtration system, which is in line with ISO 14644-1 Class 8 standard.
  
- Double-layer observation window: toughened glass and sealing tape
- Steel Safety Door: the door body is filled with fireproof rock wool, equipped with airtight strip and electronic interlock device to prevent external pollution intrusion and improve fire safety (fire
resistance limit ≥1 hour).
- Air Distributor with Filtration Function: Built-in H13/H14 HEPA filter, the filtration efficiency of ≥0.3μm particulate matter is ≥99.97%, to ensure that the air supply cleanliness meets the ISO 14644-1 Class 5-8 standard
- Ventilation Duct: Galvanized air duct with high strength, corrosion resistance (surface galvanized layer ≥80g/m²), good fire-resistance performance (class A non-combustible).
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References:
- S. Ahmed, et al., Study of a dry room in a battery manufacturing plant using a process model, Journal of Power Sources, 2016 ,326, 490-497.
- E. Zeferino, et al., Assessing the impact of mini environments in lithium-ion battery production under uncertainties, Procedia CIRP, 2025, 134, 1053-1058.
