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Results from almost total discharge of a Gen 2 module

Discussion in 'Gen 2 Prius Technical Discussion' started by TMR-JWAP, Mar 18, 2017.

  1. TMR-JWAP

    TMR-JWAP Senior Member

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    Did a little experimenting with a Gen 2 module that had maxed out at ~3000mah capacity even after 5 discharge/charge cycles. It was interesting to see that the chart shows how one bad cell affects the module.
    Everything was looking great just before the 18 minute mark. Current draw was 6.5 amps and terminal voltage was 7.3, hadn't even reached the 7.2 volt plateau when BANG, the first cell failed. It then went 32 more minutes at 6.5 amps before the next one failed. Then they fell like dominos.

    upload_2017-3-18_22-37-54.png
     
    #1 TMR-JWAP, Mar 18, 2017
    Raytheeagle and SFO like this.
  2. Hybrid Battery Exchange

    Hybrid Battery Exchange Member

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    At 7.86 resting voltage you didn't even start out at full charge, pretty healthy module besides the one cell crapping out after 1.95ah. In my experience there is absolutely no recovery (unless you start drilling holes and adding liquids).
     
    #2 Hybrid Battery Exchange, Apr 10, 2018
  3. Cody26

    Cody26 Junior Member

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    How do you know that cell was lost by the jump you observe in a voltmeter?
     
    #3 Cody26, Oct 6, 2018
  4. Dxta

    Dxta Senior Member

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    I think that was an experiment performed by Bill, some years ago? He did recover some lost capacity, but problem was how to seal the drilled holes.


    Dxta
     
    #4 Dxta, Oct 7, 2018
  5. Dxta

    Dxta Senior Member

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    See reply #4
     
    #5 Dxta, Oct 7, 2018
  6. Dxta

    Dxta Senior Member

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    I think that was an experiment performed by Bill, some years ago? He did recover some lost capacity, but problem was how to seal the drilled holes.


    Dxta
     
    #6 Dxta, Oct 7, 2018
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