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LOW RELATIVE HUMIDITY AND DEWPOINT REQUIREMENTS WITHIN LITHIUM BATTERY DRY ROOMS

Lithium Battery (Li-ion) powering the future


In the 21st century, humanity has become an engine, participant, and witness of the revolution in the energy sphere. We harness renewable energy sources (RES) such as sun, wind, and water movement. In recent years we have begun to understand the importance of preserving the environment in which we live. One particular area of focus, is the increasing use of electrified means of transport, this is set to become an important step forward in the goal of reducing inner city pollution.

In the whole technological chain of the power system, from production to the final consumer, the task of accumulating generated energy (including mobile energy such as gadgets and electric vehicles) and its use has become increasingly critical towards achieving the goal of reducing carbon footprints. The most common energy storage element in production today, is the lithium-ion battery (Li-ion).

 

MDC4000DD Single Rotor - Ultra Low Dewpoint Series

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 (tdp) of minus 20.0°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 35.0˚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 70.0°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 75.0°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.


Dry Room Design


From concept to delivery and beyond.

We offer turnkey packages 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 technicial support.

DT Group Twin Rotor DD Series
The next generation of multi rotor desiccant dehumidifiers

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

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

Benefits:

  • 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 70.0°Cdp
  • Long life rotor seals to maximise performance.
  • User friendly Siemens based touch screen interface
  • Airflow range from 2,000 - 50,000 m³/h
  • Customisable to individual customers requirements
The MDCDD-DW series delivers market leading energy consumption, whilst achieving the ultra low dewpoints required for next generation battery production. 

 



CASE STUDY

MDC7500-15DD

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 / minus 50.0°Cdp on room return
  • External rated unit completed with FULLY WELDED Stainless steel ductwork    

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.

Some of the features available:

  • Manufacturing of internal elements in stainless steel.
  • Dual 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.

Battery Dry Room Environmental Recommendations

  • Moisture level in Lithium-ion battery processing areas should be less than minus 35°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

Consequences of Uncontrolled Humidity within Battery Dry Rooms

Pure Lithium metal is extremely sensitive to even the smallest amounts of moisture in the air. The slightest of exposure to moisture leads to reduced performance and reduced product life of the Lithium-ion battery.

Contact one of our team today to find your low dewpoint solution...