Lithium Battery Dry Rooms

Bespoke dry rooms from concept to delivery and beyond.

We offer bespoke, turnkey packages for battery dry rooms in conjunction with our trusted partners. We can work with you from initial concept, through design and delivery to ensure the end result meets your needs. On completion, we offer through life cycle support in the form of maintenance packages and technical support.

Battery dry room design Integration of low dewpoint dehumidifier into dry rooms

DT Group Twin Rotor LDP-2DW Series

Specifically designed for use in low dewpoint applications the 2DW range represents the most compact twin rotor low dewpoint units available on the market today.


  • Ease of positioning due to its compact size
  • Single piece design results in lower installation cost
  • Reduced pull down times and optimised energy consumption via the in-series internal heat recovery system.
  • Supply dewpoint down to minus 80.0°Cdp
  • Long life rotor seals to maximise performance.
  • User friendly Siemens based touch screen interface
  • Airflow ranges from 2,000 – 50,000 m³/h
  • Customisable to individual customers requirements
  • Up to 35% reduction in required reactivation power when compared to even the most efficient single rotor systems.

The 2DW series delivers market leading energy consumption, whilst achieving the ultra-low dewpoints required for next generation battery production.

Reduced operational costs

The LDP series focuses on delivering operators an energy efficient, low maintenance climate solution that has been targeted at the Battery research and production market. Energy usage is greatly reduced thanks to the hermetic construction and the use of multiple rotors that utilises wasted heat, to further pre dry the incoming fresh air. Typical savings of over 35% can be achieved when compared to even the best single rotor desiccant dehumidifiers.

Some of the features available

Each Dry Room project is considered by our specialists to meet your goals and requirements. Our goal is to deliver energy efficient systems that are built to last.

  • Manufacturing of internal elements in stainless steel.
  • IDual rotor variant, optimised for large volumes of fresh air
  • Construction to contain minimal zinc materials
  • Maximising energy efficiency through the utilization of heat recovery systems
  • Range of reactivation mediums to allow future decarbonisation of the system (electric, steam, thermal oil, HTHW)
  • External construction available
  • HEPA Module

The DRYAIR team are always ready to work with you.

MDC4000DD Single Rotor - Ultra Low Dewpoint AHU DT Group - Low dewpoint industrial dehumidifiers for battery dry rooms


Installed in 2023 within a new battery chemistry research facility. Achieving an impressive supply dewpoint of minus 79.3°Cdp. This new series from DT Group allowed for a 35% reduction in required reactivation energy over even the most efficient single rotor systems available.

Key features

  • Ultra compact dual rotor unit for low energy consumption
  • Room/Airlock Cascade system via DRYBLADE®
  • New design allows for standard CHW temperatures for increased efficiency


Installed within a new battery chemistry lab situated in the UK. Target supply dewpoint of minus 60.0°Cdp / return target minus 40.0°Cdp.

  • During testing at design occupancy, the unit achieved supply dewpoint of minus 67.0°Cdp at point of supply whilst achieving the required return air dewpoint.
  • External rated unit completed with FULLY WELDED Stainless steel ductwork
MDC4000DD Single Rotor - Ultra Low Dewpoint AHU DT Group - Low dewpoint industrial dehumidifiers for battery dry rooms

About lithium battery dry rooms and the importance of low dewpoint dehumidification systems – Research & Production

Lithium battery production, takes place in controlled environment rooms now commonly referred to as “Dry Rooms”. Classified as requiring relative humidity (RH) <1% or dewpoints (Cdp) of minus 30.0°Cdp and below. Requirements are often expressed in dewpoints as the equivalent relative humidity is close to zero. Low dew point dehumidification systems are the crucial element required in lithium battery production. Dewpoint requirements within dry rooms, currently range from minus 30.0˚Cdp to as low as minus 60.0°Cdp, this point is measured in the return air stream as represents the average across the room. At critical areas such as electrolyte fill, the supply dewpoint required can be as low as minus 80.0°Cdp.

Low dew point dehumidification systems are the crucial factor required to prevent the lithium from absorbing moisture vapor from the air.

Violations of parameters, particularly at critical stages of production, such as electrolyte fill, will lead to a decrease in the quality of the Li-ion battery. To maximise product quality, microclimates are often created at critical production points, where the moisture level in the air should be close to zero as possible.

The next generation of batteries currently in design, are showing an increasing demand for even lower dewpoints of minus 80.0°C and below, as such, energy consumption for maintaining the dry rooms, will continue to form a significant part of the cost of producing lithium-ion batteries.

To minimise this production cost, the dry rooms should be constructed in a manner to reduce infiltration, to as low as practicable. Crucially, the room air drying systems, should be designed to be as energy efficient as possible, and should be able to react quickly to changing external conditions.

Dryair’s focus is the deployment of energy efficient dual rotor, desiccant dehumidifier technology, to provide the continuous supply of low dewpoint air into dry rooms. These innovative designs are now the new benchmark across the battery industry.

Battery dry room environmental recommendations

  • Moisture level in Lithium-ion battery processing areas, should be less than minus 30°C dewpoint. 
  • Room temperature should be maintained at 25.0°Cdb with tolerance of ± 2.0°Cdb
  • The air change rate in the production room, should be between 20 to 50 air changes per hour, with only minimal fresh air introduction for positive room pressure and ventilation for workers.

Effects of uncontrolled humidity within battery dry rooms

During production, Lithium batteries can be severely affected by exposure from uncontrolled temperature, this ultimately will lead to impacting on the final quality of the battery through:

  • Reduced product life
  • Reduced performance and charging capacity
  • Long term safety concerns including chances of explosion