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High HV Battery Temp and Cooling fan

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by p626808, Sep 19, 2007.

  1. p626808

    p626808 New Member

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    Hi all,

    Had a situation with the prius yesterday.
    Started it up after it sitting for about an hour.
    Had the canview on..
    Battery temp was 118-120F
    and it was not letting full amps into the battery.

    I went home.. about 5 miles from where I was.. and no change in temp.

    I parked.. and then went to the vent in the back seat..
    And felt cool air.. either comming in or out? and the noise of the fan going..

    But it did not seem to be cooling anything.

    It there another vent to the outside where the air would come out.. so the battery would cool down?
    Want to see if it is blocked... never had a temp that high.. and stay that high before..

    Worried it might meltdown or something..

    Got 120K on the car now.. too early for a new battery..lol

    any insight would be appreciated..

    Thanks,

    Scott
     
    #1 p626808, Sep 19, 2007
  2. qbee42

    qbee42 My other car is a boat

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    The cooling fan pulls air from the inside and pushes it out of the car.

    Tom
     
    #2 qbee42, Sep 19, 2007
  3. p626808

    p626808 New Member

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    <div class='quotetop'>QUOTE(qbee42 @ Sep 19 2007, 12:06 PM) [snapback]514796[/snapback]</div>

    Kinda of figured that.. but where does it exit the vehicle? :unsure:

    Anyone?

    Scott
     
    #3 p626808, Sep 19, 2007
  4. naterprius

    naterprius Senior Member

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    Under the left rear corner of the car. Lift the cargo cover, pull the mini cover in that corner, remove the box, and feel the rubber flap.

    Voila. You found the "Body Exhaust". It's on every car. Without it, drawing in fresh air wouldn't work so well.

    FYI, my Trooper has visible Body Exhaust vents. Most cars have them hidden.

    Nate
     
    #4 naterprius, Sep 19, 2007
  5. efusco

    efusco Moderator Emeritus
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    While performance drops a little at 120F you're in no danger of harming the battery. The battery is a very large thermal mass and won't heat up or cool off very quickly. Had your drive been 20-30 miles with the AC running in the car you'd have begun to see the temperture begin to settle down.
    Think of it this way...if you'd not have had the CAN-View you'd have never known the battery was hot, there would not have been any warning lights or anything and you'd have not lost a moment's sleep on the matter.
    [​IMG]
     
    #5 efusco, Sep 19, 2007
  6. p626808

    p626808 New Member

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    <div class='quotetop'>QUOTE(efusco @ Sep 19 2007, 04:02 PM) [snapback]514927[/snapback]</div>

    Thanks Evan for the picture.. will check to see if there are any problems with the vent..
    It has cooled down over the last 2 days.. was down to 75 this AM..

    I also noticed this with the can view..
    I used to get the 125 amp full output at a battery temp of 77 degrees F
    This morning.. that did not happen 'till 82 degress f

    Five degrees higher.... I did just recently get the can-view updated..
    Could that be the difference.. or could it be something else? :eek:

    Yeah I know.. I'm paranoid.. :lol:

    Scott
     
    #6 p626808, Sep 20, 2007
  7. patsparks

    patsparks An Aussie perspective

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    Please excuse my ignorance but I wouldn't have thought 120 degrees F was all that high for a battery, only a few degrees more than ambient in summer here and many places with mid latitude climates.

    Does anyone have a graph of battery performance V temperature?
     
    #7 patsparks, Sep 20, 2007
  8. ken1784

    ken1784 SuperMID designer

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    <div class='quotetop'>QUOTE(patsparks @ Sep 20 2007, 09:39 PM) [snapback]515195[/snapback]</div>
    The chart below came from following site...
    http://www.peve.jp/e/hevjyusi.html

    Ken@Japan

    [​IMG]
     
    #8 ken1784, Sep 20, 2007
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