What is the temperature range for HV Battery

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.

 

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.

 

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.

 

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.

 

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

 

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.

 

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.

 

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!

 

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.

 

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.

 

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.

 

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.

 

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.

 

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