Re-hydrating the battery modules.

Discussion in 'Gen 2 Prius Technical Discussion' started by Britprius, May 6, 2015.

  1. Amjad Mousa

    Amjad Mousa New Member

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    Hi John,
    Can I apply this method on prius hybrid nimh battery for 2010 and up or it is different electrolyte
     
  2. Amjad Mousa

    Amjad Mousa New Member

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    Hi Alex, what is the KOH ratio for the rehydration. Is 20% in water is good to rehydrate battery for prius 2010?
     
  3. Britprius

    Britprius Senior Member

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    The method used is exactly the same for the gen3 Prius as the gen2.
    John
     
  4. Rmay635703

    Rmay635703 Senior Member

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    I noticed someone didn’t bother drilling holes and instead “pressure filled” their cells by submersing in distilled and pressuring above the relief valve pressure and had similar results

    I am wondering how someone would do this at home, I don’t know of any cheap pressure vessels I can stick battery cells in and seal up to pressurize
     
  5. Skibob

    Skibob Senior Member

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    To what pressure? You could rig up an old pressure cooker if the pressure isn’t crazy high.
     
  6. Rmay635703

    Rmay635703 Senior Member

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    160psi+
     
  7. ChapmanF

    ChapmanF Senior Member

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    This idea fills me with questions, not least about the assumption that a pressure vent valve also will open inward under some external pressure ... it's easy to picture valves that would not ....
     
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  8. Skibob

    Skibob Senior Member

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    That’s too high for a pressure cooker. Is that the blowout pressure? If it’s a check valve type assembly the inbound pressure might be less. Especially if the battery is at a cooler temperature.
     
  9. Skibob

    Skibob Senior Member

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    Even if they opened how could you be sure they closed properly?
     
  10. Rmay635703

    Rmay635703 Senior Member

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    Many failing cells have blown the relief to vent,
    on these cells a release out can break the relief (once and done) so no guarantee there either
     
  11. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    Pictures? Good idea.

    This module self removed it's top for testing.

    valve2.jpg


    Valve removed.

    valve3.jpg

    I used a bicycle pump to test the valve. In the reverse direction the valve did not open at up to 140 PSI. In the forward direction the valve first opened at 120 psi. After that it would open at 80 psi.


    valve5.jpg

    Inside the valve is a simple rubber plug. It is held tight to the smooth bottom of the valve. When pressure builds up inside the rubber plug distorts and gas is vented through the "X" pattern on the inside of the top of the valve.

    The bottom of the valve does not have any passages to allow gas to enter the valve.

    I consider the valve to be one way only.

    valve6.jpg
     

    Attached Files:

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  12. ChapmanF

    ChapmanF Senior Member

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    Hmm, so I take it the difference between gas venting and top self-removal ought to be somewhere between 80 and 120 psi?
     
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