LITHIUM BATTERY PRODUCTION DRY ROOMS

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LITHIUM BATTERY PRODUCTION DRY ROOMS

• Robert Smith
• Harris Environmental Systems Inc
• March 2001

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How Dry Do You Need Your Dry Room To Be?

• With Lithium Metal Primary Batteries, 2RH or
  Less Is Typical
• For Li Polymer, Do Lower dewpoints Higher
  Yields??
• 1RH -34 C Dewpoint 246 ppmv
• .5RH -40 C Dewpoint 127 ppmv
• .04RH -60 C Dewpoint 10.6 ppmv
• -60 C Is Now Available, But Is It Needed?

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Li Ion and Li Primary Dry Room Dewpoints

• Return Air Supply Air
• Sony (Ion) -36 C (198 ppmv) -56 C (18
  ppmv)
• PolyStor (Ion) -29 C (430 ppmv) -48 C (50
  ppmv)
• LG (Ion) -34 C (246 ppmv) -60 C (10
  ppmv)
• UltralifePrimary-29 C (430 ppmv) -48 C (50ppmv)
  
• What dewpoint is correct??? Possibly all of the
  above based on the battery materials utilized.

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Automation Higher Dry Room Heat Loads

• Increased Heat Loads Will Increase Room Cooling
  Requirements
• Higher Loads Greater Refrigeration HP
  Additional Dry Room Air Handlers
• RESULT Increased Dry Room Energy
  Costs Higher Cell Variable Costs
• Be Careful !! Most Facilities Overestimate
  Machine Automation BTUH

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The Benefits of HPX Rotors

• No Chance of Rotor Washout or Breakdown With a
  Loss of Reactivation Heat
• Lower Dewpoints, -60 C is Easy Now
• 10 Year Structural Warranty if Filters Are
  Cleaned
• Rotors Can Be Washed With Water If Dirty
• Dry Room Performance is Improved
• Proven in Harris Dry Rooms Since 1993

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Compare HPX 9000 CFM D/H System at-48 C Dewpoint
vs. -60C Dewpoint

• With -48 C Dewpoint supply air, you get
• 6635 CFM supply
• 1738 CFM exhaust
• 35 people at 2
• 17 people at 1
• 105 HP refrigeration
• 142,000 BTUH Room Cooling Capacity

• With -60 C Dewpoint supply air, you get
• 4800 CFM supply
• 1000 CFM exhaust
• 29 people at 2
• 14 people at 1
• 80 HP refrigeration
• 100,000 BTUH Room Cooling Capacity

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Comparison of HPX Composite vs. LiCL Desiccant
Rotors

• HPX Rotors
• Can supply air at -60 C Dewpoint (10.6 ppmv)
• No wheel structural breakdown with loss of
  reactivation heat
• 10 year life expectancy
• With same size rotors and identical dewpoints,HPX
  can process 50 more air than a LiCL rotor

• Lithium Chloride Rotors
• Can supply air at -48 C Dewpoint (49.7 ppmv)
• Wheel structure may breakdown if low temp
  reactivation continues
• 3-10 year life expectancy

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Harris DryWare DDC Dry Room Control System
Architecture
Supervisory Controller
Local Controller For 1st D/H System
Modem for Harris/Client Service Access
Local Controller for 1st Refrigeration System
Terminal for Client Access
Local Controller For 2nd D/H System
Touchscreen for System Access
Local Controller For 2nd Refrigeration System
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Variables Measured with Harris Dry Room DDC
Controls

• Blended air temperature entering the
  dehumidifier.
• Discharge air temperature off the dehumidifier
  wheel.
• Room supply and return temperature.
• Leaving air temperature off the pre-cool coils
  for return and make up air.
• Suction temperature on each condensing unit.
• Discharge temperature on each compressor.
• Discharge pressure on each condensing unit.
• Dewpoint control monitoring.

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Comparison of HX Desiccant vs. LiCL Rotors 9000
CFM

• HPX Rotors at -48 C DP
• Max. Volume 9000 CFM
• Max. Supply Air 6635 CFM
• Max. Exhaust 1738 CFM
• 35 People at 2RH
• 17 People at 1RH
• Can supply air at -60 C Dewpoint (10.6 ppmv) for
  ultradry applications if required

• LiCL Rotors at -48 C DP
• Max. Volume 6000 CFM
• Max. Supply Air 4455 CFM
• Max. Exhaust 1091 CFM
• 23 People at 2RH
• 12 People at 1RH
• Can supply air at -48 C Dewpoint (49.7 ppmv)

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Sony Harris DH Series Skid, 9000 CFM,
1 of 3 Systems
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Sony Harris DH skid, Steam Reactivation
Piping Ducting
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Sony Harris DH System Air Cooled Condensing
Units
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Sony Li Polymer Dry Room Layout
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Typical Li Battery Dry Room

• Multiple D/H Systems
• Clean/Dry Room
• DryWare DDC Controls

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