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Prius cell block 2 failing

Discussion in 'Gen 2 Prius Technical Discussion' started by Parrish21r, Oct 19, 2016.

  1. Parrish21r

    Parrish21r Junior Member

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    Ok so tech stream says cell block 2 is failing. So I clear the code check the voltage on those particular cells and both reading 7.7v. all the cells besides two are in 7.5-7.7 range. The two cells reading lower are the first cell in cell block one at 7.46 and the last cell in cell block 14 is at 7.51 at the lowest two voltages. Any advice on whether I should go ahead and replace the 7.46 cell or should I try to balance out the pack to 7.5? I feel like cell block two voltages having such an increase could be a problem but I feel like it's something else. Any ideas? During a load test while still in the car cell block 2 voltage was higher than the rest. I have a full pack grid charger and a small discharger. Any ideas or links to previous problems similar would be greatly appreciated.

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    #1 Parrish21r, Oct 19, 2016
  2. dolj

    dolj Senior Member

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    What does this even mean? This statement indicates you do to understand what balancing is. To balance a module, you need to gently over-charge the module (@ < 350mA) so that the lowest charged cell within that module gets fully charged. The nominal fully charged voltage is ~1.4 V per cell, so you should be looking for a fully charged module voltage of ~ 8.4 V. Any module that cannot attain ~8.4 V and is a multiple of ~1.2-1.4 V less, indicates a failed cell–which means throw out the module and replace.
    What do you mean by that? A block (2 modules) that is indicated in Techstream with a P301x (presumably P3012, in your case), should charge faster under charge; and discharge faster under load, so what you are telling us does not seem consistent. More info would help.
    Put your pack back together, if it is apart, and do a full balance charge followed by a three cycle discharge/charge regime. After that come back and revisit the state of each block. If you still get P301x codes, replace the ones identified.
     
    #2 dolj, Oct 20, 2016
    Last edited: Oct 20, 2016
  3. Parrish21r

    Parrish21r Junior Member

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    Most blocks in tech stream on live data were showing like 15.5-16.9

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    #3 Parrish21r, Oct 20, 2016
  4. Parrish21r

    Parrish21r Junior Member

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    It being 16.9 and it was higher than any of the other blocks by about .5v

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    #4 Parrish21r, Oct 20, 2016
  5. dolj

    dolj Senior Member

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    That's a wide spread. See if a balance charge will close that down a bit.
    And you got a P3012?
     
    #5 dolj, Oct 20, 2016
  6. Parrish21r

    Parrish21r Junior Member

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    Ok appreciate the input! I've got the higher voltage cells discharging down right now then I'm going to place it on the grid to balance it out.

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    #6 Parrish21r, Oct 20, 2016
  7. dolj

    dolj Senior Member

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    Does your discharger only do 1 module at a time?

    You need to discharge all modules down to the same level (1st discharge to .8 V per cell or 4.8 V per module, before grid charging.
     
    #7 dolj, Oct 20, 2016
  8. JC91006

    JC91006 Senior Member

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    I can't see how it's possible to have 15.5v to 16.9v in the same pack.
     
    #8 JC91006, Oct 20, 2016
  9. Parrish21r

    Parrish21r Junior Member

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    That's what was bothering me about it Bc i did it repeatedly Bc i thought something might have been off with my tech stream and It did fluctuate slightly but not by much.

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    #9 Parrish21r, Oct 20, 2016
  10. Parrish21r

    Parrish21r Junior Member

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    6 cells at a time.

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    #10 Parrish21r, Oct 20, 2016
  11. dolj

    dolj Senior Member

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    So 1 module, or do really mean 6 modules (36 cells)?

    BTW, You need to discharge all modules down to the same level (1st discharge to .8 V per cell or 4.8 V per module), before grid charging.
     
    #11 dolj, Oct 20, 2016
    Last edited: Oct 20, 2016
  12. Parrish21r

    Parrish21r Junior Member

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    1 module.


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    #12 Parrish21r, Oct 20, 2016
  13. dolj

    dolj Senior Member

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    That's why I advised the OP to "put your pack back together, if it is apart, and do a full balance charge followed by a three cycle discharge/charge regime. After that come back and revisit the state of each block. If you still get P301x codes, replace the ones identified."

    It could take a while, 1 block at a time.
     
    #13 dolj, Oct 20, 2016
    Last edited: Oct 20, 2016
  14. Parrish21r

    Parrish21r Junior Member

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    Yea that's what I'm going to do. I was just fluttered with the numbers i was seeing Bc when I had put the pack back in the car it was balanced out and once another cell went out it went haywire.

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    #14 Parrish21r, Oct 20, 2016
  15. ozmatt

    ozmatt Active Member

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    waste of time! why would you mess about discharging one module at a time before doing a grid charge? why not just run the whole pack down to about 168v with a 100w load, while trying not to drive any modles too far under 6v .. then grid charge the thing 24hrs, repeat, repeat....

    15.5 vs 16.9 is about the difference you would see if a cell had failed
     
    #15 ozmatt, Oct 20, 2016
  16. dolj

    dolj Senior Member

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    Except, according to the OP, the 16.9 one is the outlier.
    My thoughts, too. Not hard to build a light bulb discharger.
     
    #16 dolj, Oct 20, 2016
  17. ozmatt

    ozmatt Active Member

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    Gday Dolj

    that would be pretty strange, but anything is possible!

    So easy, and even easier for AU and NZ
     
    #17 ozmatt, Oct 20, 2016
  18. ozmatt

    ozmatt Active Member

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    Delete, duplicate

    (keep getting post lag lately)
     
    #18 ozmatt, Oct 20, 2016
    Last edited: Oct 20, 2016
  19. JC91006

    JC91006 Senior Member

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    Probably better to run the pack down using a 60 watt. Going low with 100 might be too much
     
    #19 JC91006, Oct 20, 2016
    ozmatt likes this.
  20. ozmatt

    ozmatt Active Member

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    100 is good until the first module hits 6v that's when I swap to a 60 ... then a 40 ... 25 ..15.. nitey nite modules lol
     
    #20 ozmatt, Oct 20, 2016
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