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Thread: Nissan Leaf battery testing

              
   
   
  1. #121
    Senior Member Stevo's Avatar
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    I was wondering what those holes were for also

  2. #122
    Seņor Member podolefsky's Avatar
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    The rectangular ones are where brackets attach in the Leaf pack. Not sure about the small round holes.

    I'm going to seal mine, probably with tape. Water could short out the cells inside.
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  3. #123
    I should be working! furyphoto's Avatar
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    Quote Originally Posted by podolefsky View Post

    I'm going to seal mine, probably with tape. Water could short out the cells inside.
    I came up with the plan ( in the shower, it's where I do my best thinking) to wrap my set of cells with automotive Vinyl wrap to keep the water out. You can heat it a tuck it into nooks and crannies and stretch it around corners. I'm now trying to decide whether to wrap them individually, or all together. Individually will make it easier to work on the pack, but all in one would prevent water . dust etc from getting between the modules.

    The stuff is cheap, about $15-20 for a 24x60 inch piece.
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  4. #124
    Senior Member DRZ400's Avatar
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    Can't wait to hear how these perform....going to pick up 12 this spring.
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
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  5. #125
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    Does someone already made some tests at high charge levels on these cells ?
    We know that they can take 2C, since the Leaf can be charged at 80% in 30min but, as we saw about their real capabilities in discharge, they may be able to take more than 2C in charge if they're well cooled !?

  6. #126
    Seņor Member podolefsky's Avatar
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    That's a good question.

    They may be able to take more, but you have to think about whether you can actually charge at that rate. Say you have an average sized pack, 82V, 60Ah. That's about 5kWh. To charge at 2C you need 10 kW. That's a lot of power from a residential circuit, and you're still only at 2C on a 5 kWh pack.

    But fast charging really make the most sense at public charging stations. Some Level 2 stations will put out 19 kW, but then you would need a 19 kW onboard charger. Unlikely on a motorcycle. (unless you're Terry Hershner)
    - Noah Podolefsky -
    The GSX-E

  7. #127
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    Yes but it's largely conceivable from a three-phase residential circuit @22kw, or more, from a static photovoltaic storage system with an external powerful DC/DC charger.
    I'm not considering this for an every day charge and not on a motorcycle.
    You don't have the ability to make these kind of tests on a single cell ?
    If not, I will try to make some tests at high rate, over 2C, but I will have to disassemble a brand new module.

  8. #128
    Seņor Member podolefsky's Avatar
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    Hey, if you can set it up, more power to you I'd like to know as well. Although, 2C is a 30 minute charge. That's still pretty quick.

    I can't do >2C charge tests, no source for over 120A continuous. The high rate discharge tests were done with a resistive load, and only for a few seconds.

    With fast charging, the first question is whether the cell survives one cycle. Then next question is what happens to cycle life, which means running over 1000 cycles.
    - Noah Podolefsky -
    The GSX-E

  9. #129
    Senior Member Hugues's Avatar
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    No possibility on my side either, was just charging at 15 amps the other day and had the heater running, suddenly i realised the junction box in the garage was melting, yikes !

    15 amps is enough for me (and no heater)
    Regards from Switzerland
    My 2.5 Upgrade Thread

  10. #130
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    podolefsky,

    "With fast charging, the first question is whether the cell survives one cycle. Then next question is what happens to cycle life, which means running over 1000 cycles."

    Does Quick Charging Hurt Battery Life? Total Miles Are More Important

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