What is the temperature range for HV Battery

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by paulcummings55, Jul 11, 2015.

  1. paulcummings55

    paulcummings55 Junior Member

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    Does anyone know what is the acceptable temperature range for the Gen2 HV Battery? Assume running A/C in 90+ degree weather constantly (Texas), set at 71 degrees Fahrenheit. Or at what temperature the Prius will throw a code? Or at temperature should raise concerns? My 2007 Prius battery temperature on the middle sensor (usually the hottest of the three, which is normal from what I have read) ranges from the low 40's when just starting, to the mid 60's after running for a while (in degrees Centigrade- forgot to change setting in Torque- say 106 to 150 degrees Fahrenheit).

    I have no idea if this is normal or not. Any official Toyota reference sheets on performance? If not, will settle for anecdotal evidence...

    I do not get a code, and have not checked to see if the HV Battery fan is clogged yet. Car is garage-kept.

    Thanks
     
  2. hchu1

    hchu1 Active Member

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    Can't answer your question, but I would check and clean the HV fan. The fan is the only thing keeping your battery operating properly. Using the a/c certainly helps, but I don't use my a/c much and I live in Houston. My '06 is working fine, so using a/c is not necessary in my opinion.

    Here is a vid to help you get to the fan.

     
  3. paulcummings55

    paulcummings55 Junior Member

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    Driving in Houston with no A/C...you are a better (if sweatier) man than I am;-) Cleaning the fan in on the agenda for this week- but would still like to know what the proper operating specs are for the fan/battery temperature. If once I clean the fan (and assuming it needs it), the temperature remains this high, I want to know whether this temperature is a concern, i.e, perhaps indicative of a larger issue with the battery.

    Thanks for the video post!
     
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  4. bisco

    bisco cookie crumbler

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    the a/c is needed to keep the battery cool. and make sure the battery vent is kept clear. there are threads here on battery temp monitoring, but, you'd have to search.
     
  5. jdcollins5

    jdcollins5 Senior Member

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    I have seem temps on Battery Temp Sensor #2 in the 100-120F range in hot temps but never in the 150F range. Of course I do not live in Austin either. It has been in the 95-100F range here for the last few weeks.

    There was an article on here where a government agency tested the Gen 1 battery and in the report it listed the normal operating range to 50C or 122F. I would think the Gen 2 and Gen 3 batteries to be similar.
     
  6. paulcummings55

    paulcummings55 Junior Member

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    I have searched, both this site and the Internet as a whole- and while there are some (but not many) examples of temperatures taken, both by individuals and by research teams, none state a definitive range of what is normal. The only related reference I could find (and it was really only hearsay- it was spoken with authority, but with no actual reference) is that at around 107 degrees, EV Mode is disabled. But that is it. Nothing remotely official or definitive.

    That said, I didn't find any references where the temp goes above the 120's, so mine being significantly higher at times, even with the Texas heat and A/C running, give me pause for concern. Hopefully I will know more after the HV battery fan is cleaned tomorrow, and if lucky will see a reduction in operating temperature. But if not...that could point to battery issues- thus my quest for details about the HV battery temperature parameters.
     
  7. hchu1

    hchu1 Active Member

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    Glad to help, fortunately I choose to drive most times without the a/c, not because I have to. I also don't sweat heavily. :)

     
  8. CBarr31

    CBarr31 Active Member

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    Paul,

    I started monitoring Ema's battery temp and fan speed after getting some codes for my battery cooling fan not running. It turned out to be a couple of things in the end. One was a corroded connection in the BM1 connector. This is just above the battery compartment which collects water from micro cracks that form in the hatch seam near the roofline. The other was a wiring issue with my Grid Charger which has since been corrected.

    XGauge - Battery Cooling Fan Mode | PriusChat

    From your post it looks like you already monitor your battery temp. I would suggest adding the BFS to your scangauge as well so you can monitor the fan speed. I don't know if this is gospel but Ema's fan comes one when buf gets above 95 F and turns off when it goes back down below that. It is very common for her to run the fan at speeds 1-3 and have the temperature range from 95 - 108 F. After parking in the sun here in NC (100+ F interior) I have gotten in her and had battery temps as high as 110 F. What's weird is sometimes the BFS reads 0 for some time before changing. It must have some kind of PID control based on both battery temp AND mode/usage?

    DASH Error Lights Exclamation w/Triangle, VSC, and small Exclamation - Car runs great? | Page 4 | PriusChat

    The link above is about the corroded connector. My battery fan error seemed to occur around 136/138 F. So if you are getting above that to 150 F my guess is your fan is running. As others have suggested you should check it and clean it if necessary. If monitoring BFS shows it isn't running start with corroded connectors.

    Good luck!!!! This is more information than you asked for but I hope it helps.

    Happy Driving,
    Chris
     
  9. fotomoto

    fotomoto Senior Member

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    I have a scangauge in my CMax Energi which also has an air-cooled hatch mounted battery but with Li-On chemistry. During the summer, I see battery temps from the low 80's to 105f. Although I've never encountered it, I read owner reports that 113F is the upper cut off temperature set by the engineers when the car will only run in HV mode. My typical summer operating temp is in the upper 90's during the day.
     
  10. paulcummings55

    paulcummings55 Junior Member

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    No- I appreciate any and all information. I know my fan does kick in- I can hear it when it goes to full speed. But you are right- I should monitor fan speed to make sure it is coming on when it should.


    Thanks for the info- I found another reference that also said 113F was the cut off for EV Mode for the Prius, rather than the 107F I found on another post- but this is why I would like more definitive, verified parameters;-) I think also, though I may be wrong in this, that Li-Ion has a narrower operational temperature range. Not the best wording- perhaps 'affected a bit more by temperature extremes' is more accurate?

    BUT- from what I have read from other sites/posts, as well as from here, my battery temperature is probably too high. I am having my mechanic clean the fan for me today (just no time for me to do it), so we will see how that affects the battery temperature.
     
  11. paulcummings55

    paulcummings55 Junior Member

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    Well- the battery fan was cleaned out today, and it was very dirty. It will be interesting to see how the battery temperature is affected by this- should be for the better;-) But I still hope someone chimes in with official parameters for the HV Battery Temperature. We have many PIDs we can measure- but except for changes over time to watch, there is only anecdotal references to the 'norms' on many of them, including this one. I am frankly surprised in this age of the Internet that such information is so hard to come by.
     
  12. JC91006

    JC91006 Senior Member

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    When the ecu detects it's too hot, then it's too hot. No warning lights, then it's not too hot. You don't exactly have any control of it.
     
  13. Aaron Vitolins

    Aaron Vitolins Senior Member

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    Glad you got it cleaned! I wouldn't be surprised if you have some long term battery capacity loss due to excessive temps. Keep that ac blowing during the summer. All the best to you and your Prius!
     
  14. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I'm watching sensor #2 temps on our 3rd gen, pretty constantly have that X-Gauge displayed, with ScanGaugeII. I 'm typically seeing temps ranging from ambient to maybe 40C. I believe the highest I've seen is around 46C, that was in relentless stop-and-go, hot day.

    If your fan was very dirty, hopefully the cleaning will help.
     
  15. jdcollins5

    jdcollins5 Senior Member

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    This is the only article I have found on the Prius battery temperatures and it was from a 2000 Prius. In this article the max temp is given as 55C or 131F.

    Even though this is for a Gen 1 battery, being NiMH I would think that a Gen 2 and 3 would be similar.

    My guess at lack of info is that if Toyota wanted you to know the technical data for the HV battery that they would make it available.
     

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  16. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Regarding "garage kept" mention by OP, we have uninsulated garage, and parking after a drive on hot days it can turn into slow death. I open two windows, put a fan in one, pop the hood. Helps a bit.
     
  17. JC91006

    JC91006 Senior Member

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    I'm not really convinced moderate heat is bad for the batteries. We have members that live in AZ that faces 115+ degree heat daily and their batteries last more than 10 years. I just think if you get a bad battery, heat or no heat, it won't make much difference.
     
  18. paulcummings55

    paulcummings55 Junior Member

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    Many replies! Let me respond in kind:

    JC91006- that is true if you can trust the warnings implicitly- but that is a very passive approach. If such data was made available, it would be much better (and easier) to be proactive. For example- cleaning the HV fan is not on Toyota's schedule- but having some warning by a higher than normal battery temperature can alert you to check. Same with many other things.

    Aaron Vitolins- yes, you may be right- I have not tested enough yet, but my battery temperature seems better, but still a little higher than others have posted. We got the car couple of years ago, and I think the capacity was already lessoned- but that is another story...

    Mendel Leisk- yes- that range (around 96 to 115 degrees) seems to coincide with other anecdotal evidence- but confirmed parameters would be better for judging the results of our scans.

    JC91006- it has been proven in many studies- heat adversely affects batteries, of all chemistries. That is why proper cooling is important. BUT- with that cooling, you can use them in places like Arizona and Texas;-) And that is not to say some batteries, like everything else mass-produced, are just bad from the start.
     
    #18 paulcummings55, Jul 15, 2015
    Last edited: Jul 16, 2015
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  19. geekwithoutacause

    geekwithoutacause Junior Member

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    I got the red triangle on Sunday when driving in hot weather. Did not check what the battery temps were at at the time since I didn't know what the code was for. My torque pro app didn't report any codes. After coming home I hooked up techstream and it showed the error was for the battery fun not running. So yesterday I took apart the pieces to get to the fan. This is very easy to do actually. The fan was VERY dirty. I pulled out a clump of hair/dust (thanks previous owner) and cleaned the vanes w q-tips. Before I did this the battery temps were in the 130/140 which seems pretty high. There is another value reported on torque app named HV- batt-air. This Slowly started dropping into the 80's. This might be the intake to the batteries ? I also see battery temps 1 , 2 and 3 which showed quite high in the 130's

    I will get another chance to drive in the heat this week for a while. I will see if the cleaning of the fan helped a lot or not. I am pretty sure it will, the fan was REALLY clogged.
     
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  20. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I've heard battery temp sensor #2 is near middle of battery, tends to be hottest and accordingly is the best one to monitor.
     
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