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LITHIUM BATTERY PRODUCTION DRY ROOMS

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LITHIUM BATTERY PRODUCTION DRY ROOMS. Robert Smith Harris Environmental Systems Inc March 2001. How Dry Do You Need Your Dry Room To Be?. With Lithium Metal Primary Batteries, 2%RH or Less Is Typical For Li Polymer, Do Lower dewpoints = Higher Yields?? 1%RH = -34 C Dewpoint = 246 ppmv

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LITHIUM BATTERY PRODUCTION DRY ROOMS

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  1. LITHIUM BATTERY PRODUCTION DRY ROOMS Robert Smith Harris Environmental Systems Inc March 2001

  2. How Dry Do You Need Your Dry Room To Be? • With Lithium Metal Primary Batteries, 2%RH or Less Is Typical • For Li Polymer, Do Lower dewpoints = Higher Yields?? • 1%RH = -34 C Dewpoint = 246 ppmv • .5%RH = -40 C Dewpoint = 127 ppmv • .04%RH = -60 C Dewpoint = 10.6 ppmv • -60 C Is Now Available, But Is It Needed? Harris Environmental Systems

  3. Return AirSupply 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) Ultralife:Primary-29 C (430 ppmv) -48 C (50ppmv) What dewpoint is correct??? Possibly all of the above based on the battery materials utilized. Li Ion and Li Primary Dry Room Dewpoints Harris Environmental Systems

  4. 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 Harris Environmental Systems

  5. 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 Harris Environmental Systems

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

  7. 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 Comparison of HPX Composite vs. LiCL Desiccant Rotors

  8. 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 Harris Environmental Systems

  9. 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.

  10. HPX Rotors at -48 C DP Max. Volume = 9000 CFM Max. Supply Air = 6635 CFM Max. Exhaust = 1738 CFM 35 People at 2%RH 17 People at 1%RH 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 2%RH 12 People at 1%RH Can supply air at -48 C Dewpoint (49.7 ppmv) Comparison of HX Desiccant vs. LiCL Rotors: 9000 CFM

  11. Sony: Harris DH Series Skid, 9000 CFM, 1 of 3 Systems Harris Environmental Systems

  12. Sony: Harris DH skid, Steam Reactivation Piping & Ducting Harris Environmental Systems

  13. Sony: Harris DH System Air Cooled Condensing Units Harris Environmental Systems

  14. Sony: Li Polymer Dry Room Layout Harris Environmental Systems

  15. Typical Li Battery Dry Room • Multiple D/H Systems • Clean/Dry Room • DryWare DDC Controls Harris Environmental Systems

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