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Redoing the battery.

Discussion in 'Gen 2 Prius Main Forum' started by Prius92, Aug 1, 2024 at 12:58 PM.

  1. Prius92

    Prius92 Member

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    This was the Dr.Prius readout.
    [​IMG]

    Pulled the hybrid battery out.

    1st glaring thing I see:

    [​IMG]

    When I rebuilt the pack around 18 months ago, none of this was there.

    I had nickel plated copper on one side, the original (but polished) bus bars on the other.

    The nickel bus bars held up well.

    [​IMG]


    The copper ones...did not.

    [​IMG]

    One of the 28 modules appears to have gone kaput. It measures only 2.3 volts.

    A couple measure 7.30, but over 25 measure 7.46.

    7.2v is the "nominal voltage", so I'm not sure what state of charge 7.4x28 or 207.2 volts would be.
     
    #1 Prius92, Aug 1, 2024 at 12:58 PM
    bisco likes this.
  2. ski.dive

    ski.dive Active Member

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    Rebuilt Batteries are only a temporary fix.
     
    #2 ski.dive, Aug 1, 2024 at 2:23 PM
  3. bisco

    bisco cookie crumbler

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    that's what makes them so much fun!
     
    #3 bisco, Aug 1, 2024 at 2:26 PM
  4. TMR-JWAP

    TMR-JWAP Senior Member

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    "Temporary" has quite a wide tolerance. Sometimes 1 month...sometimes 5+ years
    On a tight budget, that one module can be replaced, and that battery may last a while. You never know until you try.
     
    #4 TMR-JWAP, Aug 1, 2024 at 2:26 PM
  5. pasadena_commut

    pasadena_commut Senior Member

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    Odd values on the bottom. The internal resistance is exactly the same on all modules, even the one which has a very low voltage. The bad one also has a 0.00 cumulative delta voltage, while the other cells have tiny voalues. Isn't a weak cell usually a large CDV? Guessing this is a brief snap shot and the software hasn't had time to collect enough data to properly calculate those values.

    Edit: the display really should indicate the data collection period somewhere...
     
    #5 pasadena_commut, Aug 1, 2024 at 2:29 PM
  6. bisco

    bisco cookie crumbler

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    even a new oem is temporary, as is life
     
    #6 bisco, Aug 1, 2024 at 2:29 PM
  7. TMR-JWAP

    TMR-JWAP Senior Member

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    The IR value of 19 is default whenever 12v is lost and restored. It updates eventually, but the screenshot is likely to have been done shortly after a 12v cycle.
     
    #7 TMR-JWAP, Aug 1, 2024 at 2:42 PM
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