The🌎most Sustainable battery dry rooms

The right way to dry a dry room


95% Reduction of CO₂ emissions


40% Reduction of dry room energy bills


Extremely low dew point for better safety and quality.

The right way to dry a dry room

Cotes is an independent family-owned business that designs and manufactures adsorption dehumidifiers [dry-air solutions] for all types of industrial applications across the world, focusing on sustainability, efficiency, quality and positive impact. 

Lithium-ion battery dry rooms use a lot of energy, up to 43% of total energy consumption in the battery manufacturing process, to keep the dry rooms super dry—that's a relative humidity of under 1% and dew points ranging from -70°C to -120°C.

Cotes offers an Ultradry-air Solution for battery dry rooms that uses our Cotes Exergic Technology [patent pending], enabling massive energy reductions, cost savings, and huge CO₂ emissions reductions of up to 95%.

Looking at the data

Current Process Energies of Li-ion Battery Cell Production

dry-room-pie-chart copy-min

Battery dry room energy consumption

The above circle diagram shows the different sources’ energy contributions to the total cell production and battery pack assembly energy in a typical battery manufacturing facility. [SOURCE] Data from Yuan et al. (2017). The processes included in ’other’ are mixing, coating, calendaring, welding & sealing, LiPF6 (electrolyte) filling, and pre-charging. It is clear here that running dry room equipment and NMP (N-methyl-pyrrolidone) drying are significantly larger contributors to process energy use than other sources. 

The most sustainable ultradry solution

Reduce CO₂ Emissions by up to 95%

dry-room-pie-chart-Cotes reduction_60-min

Battery dry room energy reduction

Up to 43% of the energy consumption for lithium-ion battery cell production is for running dry rooms. Cotes Exergic Technology can reduce this energy consumption by up to 60%​.

Sustainable energy sources

Of the remaining 40%, up to 85% can be sourced from low exergy (low temperature) sources, like waste heat, solar thermic panels, heat pumps, etc.

CO₂ emission reduction

The Cotes Exergic Technology enables your battery dry room to be more energy-efficient and gives you the possibility to use a combination of different sustainable energy sources reducing the CO₂ emission for running a battery dry room by up to 95%

Cotes Exergic Technology

Choose a combination of different sustainable energy sources


Exergic Technology Concept Illustration-min

How it works

With the Cotes Exergic Technology, you can utilize a combination of sustainable energy sources to achieve considerable energy cost savings and large carbon footprint reductions. All you need for Cotes Exergic Technology to work is hot water heated by a sustainable energy source: 

  • Waste heat (District heating or waste heat from elsewhere in the li-ion battery production) 
  • Biomass or Biogas (if available and sustainable) 
  • Solar thermal panels 
  • CO Heat Pump used for both heating and cooling. Pay once and use twice. 
  • Electricity (From sustainable energy sources, i.e., wind power, hydropower, solar power and/or nuclear power) 
  • Gas ** 

**Cotes does not recommend or consider gas as a source of sustainable energy due to the environmental footprint. We recommend utilizing energy for the hot water from sustainable or “green” energy sources instead. However, if gas is a requirement, the water can come from a central gas boiler. 


Why use hot💧water?

Cotes Excergic Technology uses hot water because it enables flexibility, makes your dry room operations safer, and has low installation costs—all you need is hot water [80-90°C].

Because the energy to heat the water can come from a combination of sustainable energy sources and can be changed in the future if the price of energy changes, it makes the Cotes Exergic Technology more sustainable and more future proof. This flexibility is not possible if the dehumidifier is built for gas regeneration specifically.

Cotes Exergic Technology is highly efficient. We are able to provide a dew point of -120°C for an unstaffed dry room and -70°C for a manned room. 

The Cotes Exergic Technology is less vulnerable to toxic leaks and has a high safety margin running nominal conditions at low temperatures. Running optimal conditions at low temperatures (80-90°C) allows the electric booster inside the dehumidifier to increase the drying capacity when needed without jeopardizing the effectiveness or the safety of the system. Our closest competitors run optimal conditions at maximum temperature (140-180°C) making it vulnerable to any fluctuation in humidity and drying capacity.

Low-cost sustainable batteries

Making Li-ion batteries as green as possible

From time to time, the discussion pops up on how green electric cars really are? We make the argument for cheaper lithium-ion batteries and a cheaper electric car through reducing energy use in the battery manufacturing process.

Number of battery dry rooms around the world using Cotes ultradry adsorption dehumidifiers


Better control and lower costs

Exceptional control of cleanroom manufacturing conditions

Better electrolyte performance, better product quality

Reduced energy consumption, lower operating costs, and lower carbon footprint

Maximum production uptime and lower service and maintenance costs


Each unit is designed to handle large volumes of air of ~32.000 m3/h


Performance and reliability

Exceptional reliability – important for operations-critical environments

Easy to configure to specialist requirements in lithium-ion battery manufacture, even with dew points as low as -120°C (in unmanned dry room)

Designed to achieve exceptionally low energy consumption and operating costs

Available with advanced monitoring and control systems for maximum flexibility

The challenge

When you don't have the right dry-air solution

To safely manufacture lithium-ion batteries you need a relative humidity of less than 1% because of the delicate chemistry involved. Maintaining this %RH is energy-intensive and costly if you don't have the right dry-air solution.


Lithium reacts intensely with water, forming dangerous combinations of lithium hydroxide, highly flammable hydrogen and heat


Exposing lithium to humidity levels above 1% impacts quality, performance and lifespan of batteries


Energy expended to control humidity results in high operating costs and affects profit margins


Any humidity irregularities can affect your battery production andoutput


Service and maintenance costs increase to counter the effects of humidity without the right ultradry-air solution