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COLD's impact on LiFePO4 (Mottcell)

Discussion in 'Prius PHEV Plug-In Modifications' started by overlap, Nov 20, 2010.

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  1. overlap

    overlap New Member

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    Hi,

    My Enginer Kit is older, but it is also quite a bit colder. Is there a significant difference in usable energy at 40 degrees vs. 80 degrees? I would expect so but would like confirmation.

    (Similar profile as Pb? Very familiar with the various levels of cold's effects on Lead-Acid Batteries.)

    Thanks!
  2. dan2l

    dan2l 2014 Prius v wagon

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    Hi Overlap
    Yes, but I see more effect on the Prius at this point than on the Enginer system. However, my car is in the garage at night.

    I use grill blocking and I am already into the maximum amount of grill blocking. The Prius is really cold blooded when you use a PHEV system that minimizes the ICE.

    If you do a quick top-off charge just before you drive the car then that will help to warm up the MottCells.

    Thanks,
    Dan
  3. overlap

    overlap New Member

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    Thanks. It is now 30 degrees :) My car is in the garage too, so perhaps a max of 35 degrees.

    I have a voltmeter inside the car for the 50v pack. When it was much warmer, 65-70-80 degrees, it would take perhaps 15 minutes of use before the volt meter would dip below 50v. Now it immediately drops to 49.x MUCH sooner (with a top-off). Could the the cold and older batteries. And my overall range has dropped by nearly 10 miles.

    I am considering using an electric blanket, as much as an experiment. I need to move my 2KW of batteries into the spare tire well, and I knew I needed to do something to pad the cells. Thinking of using household insulation on the bottom and sides and an electric blanket to wrap the cells. I have been monitoring the temp with a thermometer and a Kill-O-Watt meeter to see the current draw. On just about the lowest setting, it is easy to maintain 80 degrees inside. Since heat rises, the Enginer box will have to get some of the heat too.
  4. dan2l

    dan2l 2014 Prius v wagon

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    This is not normal. I think you have an issue other than the cold.

    Charge the system to full.
    Turn the car on put it into EV.
    Turn on the Enginer system
    Read and record Vi,Ii,Vo,Io
    Read and record all 16 cell votages
    Read and record Vi,Ii,Vo,Io again.

    Get all those readings to me.

    Thanks,
    Dan Lander
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