Planing CanView and BMS+ conversion with lithium

Discussion in 'Prius PHEV Plug-In Modifications' started by Mr-plugin, Oct 27, 2011.

  1. Flying White Dutchman

    Flying White Dutchman Senior Member

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    so low current would be a smart thing at low temp?
     
  2. lopezjm2001

    lopezjm2001 Senior Member

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    When using these A123 20ah pouch cells it may be unnecessary but you cannot be certain unless you have a full specifications sheet for these cells.

    My RFE (RealForce Enterprises) Chinese Lifepo4 20 ah pouch cells for my Enginer kit have a spec sheet which shows a graph that at -20degC the cell will only discharge to 50% i.e.10ah. The BMS16D will shutdown charging if the battery temperature falls to a low temperature i.e. 0 degC.

    http://www.enginer.us/f/index.php?action=dlattach;topic=1273.0;attach=12701

    The RFE spec sheet also specifies the following operating temperatures:

    Discharge: -20 to 60 degC

    Charging: 0 to 45 degC

    I am sure that the A123 20ah pouch cells are superior but how superior nobody really knows.
     
  3. planetaire

    planetaire Plug in 20 kWh 85 km/h or > 208km range

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    Inside temp is between 17 and 20°C now, in winter. My charging current is 2A only because I use a small power supply (500w). But I will use an 2500w Elcon charger too, because 8 hours charging can be to small.
    I have canceled sometime charging process during day. I think 4 hours will be ok.
    So yes, charging current control is very interesting.

    We don't have full A123 20Ah datasheet.
    Don't you think we can use some of the A123 2,3Ah cylindrical specif. ?

    :)
     
  4. Flying White Dutchman

    Flying White Dutchman Senior Member

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    4 hours with a 2500?
    the elcon 1500 would do that? 80% is about 3800 watt right? taking a 90% eff of the charger that would take 3 hours and 20 min
    with the 2500 thats 2 hours and 10 min
     
  5. lopezjm2001

    lopezjm2001 Senior Member

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    Maybe. Depends on how similar they are. I do not know.

    But I would setup your BMS to terminate charging if the cell temperature falls to 0 degC or below. I would reduce charging current between 10 and 0 degC.
     
  6. Flying White Dutchman

    Flying White Dutchman Senior Member

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    the cylindric are a lot different
    i dont think you can compare those
     
  7. planetaire

    planetaire Plug in 20 kWh 85 km/h or > 208km range

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    I will add more cells :D because I have also longer trip then 38-40km.
    And I will test 72x2. So 9360Wh. Using 85% DOD = 8kWh. Elcon "2.5kW" send 9A, so average power send is a little over 2kW. Then 4 hours.

    Why 72x2 cells ?

    When you have 70 A123 20Ah voltage very rounded, with fully charged cells, is 235v +-10v. So 245v maximum with medium regen.
    With 72 40Ah I think voltage will be 235+6.6v but +-5v not +-10v.
    So maximum will be 246v. I will test and I suppose that engine won't go in compression mode like it does not actually with 70 20Ah A123.

    Then 72x2 cells will be devided in 6 packs.

    :)
     
  8. Flying White Dutchman

    Flying White Dutchman Senior Member

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    a so your doing the 72 cells like i will do ;-) ;-)

    when do you think you are ready? with you mind blowing 144 cells of these powerfull A123's ;-)
     
  9. Flying White Dutchman

    Flying White Dutchman Senior Member

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    Oooo i found 8 cells that got a bigger dent in them.
    i did not get al the foil of yet until today.
    see the pictures
    i attached 1 of these cells to a charger and pressed with my finger on the dents when charging the voltage dropt from 3,5xx to 3,48x.....
    still charging at the moment.
     

    Attached Files:

  10. Flying White Dutchman

    Flying White Dutchman Senior Member

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    when you get the elcon2500 are you still planning on charging indoor?
     
  11. planetaire

    planetaire Plug in 20 kWh 85 km/h or > 208km range

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    Only when temp will be too cold. Cells will weight 80kg.
    It will take more then a month to connect all new cells, make new boxes ...
    :)
     
  12. Flying White Dutchman

    Flying White Dutchman Senior Member

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    you have 6 boxed so only 13 kilos ;-)
     
  13. Flying White Dutchman

    Flying White Dutchman Senior Member

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  14. Mr-plugin

    Mr-plugin Member

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    As I said in the this post I took it a little too far, but wanted to test capacity. I am using SB50 connectors. Yes it was all in out of gas mode, never started engine.
     
  15. Mr-plugin

    Mr-plugin Member

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    It gets cold here, but not a lot of temps below 20F. The car is parked inside at night and I always make sure the battery is above freezing before charging. I just check the OEM pack temp. to use as a guide. They are both close to each other and should be close to the same temp. I have had to put a forced fan heater in the back by the batteries to warm them up once or twice.
     
  16. Mr-plugin

    Mr-plugin Member

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  17. Flying White Dutchman

    Flying White Dutchman Senior Member

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    sb50 and no problem at all........ so I did not have to get the sb175 that came in today...wow these are big and 2x the price ;-(
     
  18. Flying White Dutchman

    Flying White Dutchman Senior Member

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    the charger arived
    i hope to do a first bench charge after tomorrow

    tomorrow i wil try to finisch the battery box to the point where i maybe able to do a bench charge 1 day later.

    still have to make al the 73 wires for the 72 cell monitoring with the connected 72 bleeding boards ;-)
     
  19. Flying White Dutchman

    Flying White Dutchman Senior Member

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    let's make that next week....to slow
     
  20. Flying White Dutchman

    Flying White Dutchman Senior Member

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    cells compressed...bleeding and cellllog cabling temp. attached..
    maybe this weekend I blow up my pack