HV battery

Discussion in 'Gen 3 Prius Technical Discussion' started by Greenteapri, Aug 22, 2021.

  1. Greenteapri

    Greenteapri Active Member

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    The Pri has been giving me some bad feedback lately. From really bad gas mileage, to hesitation when I hit the accelerator to lethargic acceleration, all within the past week. The temps in Houston have been hot so maybe the attached pic is why the battery temps are elevated. I am curious as to what the problem could be.
    Screenshot_20210822-200915_Dr Prius.jpg
     
  2. bisco

    bisco cookie crumbler

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    how many miles on her? have you cleaned the egr circuit? if the battery gets too hot, the car will limit use, so the engine is strained.
    are the cooling fan and intake grille clean?
     
  3. Greenteapri

    Greenteapri Active Member

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    She has 113k
    EGR was cleaned at 80k
    Battery fan was cleaned, humming and pulling lots of air. I blew compressed air into the grille and no dust came out.
    How do the cells look?
     
  4. rjparker

    rjparker Tu Humilde Sirviente

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    The battery temps are too high. That is why they are in red. I would check that something is not blocking the battery fan air intake. Also run the ac on these hot days. Mine runs maybe 100f.
     
  5. Grit

    Grit Senior Member

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    always amazing how people who uses this app never change the default values when the hv battery fan should kick in and wondering why battery temps are way high.
     
    #5 Grit, Aug 22, 2021
    Last edited: Aug 22, 2021
  6. rjparker

    rjparker Tu Humilde Sirviente

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    ...
     
    #6 rjparker, Aug 22, 2021
    Last edited: Aug 22, 2021
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  7. Grit

    Grit Senior Member

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    yes, thanks for catching that
     
  8. TMR-JWAP

    TMR-JWAP Senior Member

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    Your HV battery discharge and charge limits are being reduced due to the temperature. Same thing happens if it gets very cold. If your car sits in the sun, the extra temperature inside the car will make a large difference. I found I was able to drop the interior temp of my car by about 15-20 degrees just by installing rain shields on the front driver and passenger windows and then leaving my windows open about 1/4" when leaving the car parked in the sun all day while at work.
     
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  9. Greenteapri

    Greenteapri Active Member

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    Thanks for a response.

    Can you point to a tutorial or tell me how to do this? THAT would be amazing if you can do that for me.

    I have the solar package, leave the sunroof cracked, slide the back security cover over the hatch and have 3M UV tint on all sides. Maybe I should paint my car white...
     
  10. rjparker

    rjparker Tu Humilde Sirviente

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    8DC73E47-F02D-477A-9032-D4509CB0088F.jpeg

    The only problem is you have to have Dr Prius actively communicating, eg online, for this to work. Otherwise the car decides what speed to run the fan. Its best to ensure your fan's air stream is clear. There are some hv battery faults that could also cause overheating.
     
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  11. Greenteapri

    Greenteapri Active Member

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    Thanks. I'll play with it tomorrow.
     
  12. james nancy

    james nancy Junior Member

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    If the influence of the fan can be ruled out, I think the battery ageing may be the main reason. After the battery ages, the capacity decreases and the internal resistance increases, but the battery management ecu still runs according to the preset program, which is calculated according to the charging current and time The charged energy, when the computer calculates that the charged electric energy is 60%, due to the decrease in capacity, the aging battery has actually reached 80-90%. When the Ni-MH battery is in a state of fast charging, it is easy to heat up, and secondly, it ages. The internal resistance of the battery is also increasing. If it is experiencing a downhill slope, the battery will linger in a nearly overcharged state. Before the voltage is high enough to cause the computer to operate, the chance of generating heat will be greatly increased. It is very low, and its capacity and internal resistance are in good condition.
     
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  13. ASRDogman

    ASRDogman Senior Member

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    While I was searching for a Prius, I noticed the different temps after the car sat in the sun.
    Of course the black ones were VERY hot, but so where the white ones.
    But the silver ones were not as hot. I really don't care that much about the color, but ended
    up with a Silver Prius.
    I noticed it is not as hot in the car after sitting in the Florida sun and humidity. My white van
    easily and quickly gets to 125 degrees and it takes all windows open and ac on high and a few minutes
    to get the temp down before being able to close the front windows, then a few more to close the
    rear windows, and several more to lower the fan speed and get the cabin cooler.

    With the Silver Pruis, it's about 110-115. And windows 1/2 open, fan on high, ac temp set at 74,
    it takes less than a minute to blow the heat out, front windows closed, and less than a minute
    to close the rear windows. And less than a minute before pressing the "auto" button. It's comfortable
    usually withing 1 or 2 minutes. And that's in "ECO" mode. I know there is a lot less area to cool in
    the Prius than the van, but I think silver is probably cooler.
    Though I really like the bright red! (y)

     
    #13 ASRDogman, Aug 28, 2021
    Last edited: Aug 28, 2021
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  14. Greenteapri

    Greenteapri Active Member

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    This was my reference.


    So after weeks of testing, the batteries aren't dissipating heat quick enough.
    To fix this, I'm doing what @Grit recommended and what @rjparker showed how to do with Dr. Prius. It is annoying that the app up needs to be up and going to achieve EV mode but worth it.

    The ICE keeps running until battery temps get to about 121° then switches to EV mode.

    The cool thing is my batteries are being cooled sufficiently and monitored.

    My next cars color will be white. (y)
     
  15. ASRDogman

    ASRDogman Senior Member

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    Too bad the hood doesn't effect the INSIDE of the car.....
    Why didn't he do the cabin area?

     
  16. jerrymildred

    jerrymildred Senior Member

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    The roof will be about the same as the hood. And the roof definitely affects the cabin temperature.
     
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  17. Greenteapri

    Greenteapri Active Member

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    Agreed. You also have to consider all of the components under the hood. ;)

    This is why we see white-topped school buses. The internal temps of school buses dropped dramatically after painting the roofs white.
     
  18. Grit

    Grit Senior Member

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    sources please.
     
  19. jerrymildred

    jerrymildred Senior Member

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    When I was at our radio station in Honduras, some volunteers came and painted the place. Doors and trim were a dark green. The audio shop had insulated metal double doors that faced east. All morning long, those doors radiated heat into the shop like an infrared oven.
     
  20. Greenteapri

    Greenteapri Active Member

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    Google.
     
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