Chilled out Traction Battery??

did you ever clean the battery fan?

 

Asrdogman always say the ac blows over the battery and cools it down, but the backseats are right in front of the battery. I have a mod that was inspired by...asrdogman which takes the cold air from the ac cents directly to the hv fan air intake. Duration of 20 mins for the battery to go from 110F to 90F.

 

The battery just pulls air in from the rear cabin. No direct link to the air conditioner.

I don't know that it is worth the extra work to air condition the thing all the time. It wouldn't have been that hard for Toyota to do it- if they felt it was important it I think they would have just put in the plumbing.

Keeping the pack cool is a good thing in general, but I think you'll find diminishing returns for the use of air conditioning past a certain point.

 

Maybe a sensor is faulty? You said you cleaned the fan, did you pull the cover off the
hybrid battery and check for dust or fur? When I had mine off to install the Prolong harness
there were only a few pieces of fur and light dust. Even the ducts just had a fine layer
of dust. Easily cleaned.
I'm guess you bought it used. Did they previous owner have a dog or two?

I bought the screen for the intake, and I bought some a/c foam. Both catch a lot of fur and
dust. Both only take a moment to wash off.

[QUOTE="Tommy West, post: 3304615, member: 194493"
I'm sure it does cool the battery because when I first bought the car it would throw a hot battery code immediately every time I didn't run the AC but NEVER when I did. Thanks so much you guys for reading my post. Have a super great day. Lady says, "Woof thanks Woof"[/QUOTE]

 

I think it's normal for the battery to be a bit warm. I rarely run the AC, and just for it's design purpose: cooling the cabin.

 

Crazy ? YES mostly.
As has been said, there is NO AC duct for the battery itself.
So what you are doing is not much different than leaving the AC OFF.

Even though mine says "ON", it really isn't most of the time because of the automatic temperature setting.

Blocking the vents could cause the evaporator to ice up and might cause some damage to it.

 

I've always understood Toyota's logic to be that if the driver and passengers were "comfortable," then the battery fan would be capable of keeping the battery within the band of temperatures Toyota themselves would want, knowing they were on the hook for warranty replacements for many years.

So in Southern California I'd expect air conditioning 300 days of the year, and in British Columbia I might expect it for 30.

The real point is, keep the battery fan clean, set the controls to make yourself comfortable and chances are the battery will last as long as it ever would.

Good luck!

 

I'm not sure even that is necessary.

We've been getting pretty toasty up here in summer. Summer before last was worse, broke some records, temps in the low 40C's. This summer there was protracted drought.

 

Someone here refitted the battery duct system to cool the inner modules, which made sense to me

 

The vent on the rear passenger side
Is where the HV battery fan pulls in air that is set by you when you use the a/c system.

So whatever the temp is in the cabin is what the HV battery will be sucking in to cool.

So toyota is not lying actually...

 

* Thanks for that @AzusaPrius; I wouldn’t know where to begin.

 

If the battery is at say 120 degrees, and you blow 90 degree air over it,
it is cooling the battery. Even in the winter, the cabin air will likely never
be over 80 degrees.

 

So I assume that you do not have any automatic features with your climate control except for a temperature setting.
The AC compressor will run to lower the cabin humidity too .......sometimes when it doesn't need to for temperature lowering.
Then.....if you are pulling 32 degree air though the vents, how do you KNOW that the AC compressor really is compressing and not just "free wheeling" ??

This is NOT a good thing to obsess over.
Most things aren't.

 

If the HVAC system was pulling in 32°F air, then the ambient temperature and evaporator temperature sensors would report that to the ecu.

The ecu is programmed not to engage the compressor when the temperature is too low - 'because ya don't need it!

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It doesn't need an ac vent. The instake takes in the air from the cabin.
Whether it's cool or warm. Either way, it's cooler than the battery. If it starts
getting too warm, the fan will turn faster bringing in more "cooler" air to blow over
the battery to blow out the hotter air.

How hot can you get the cab before you have to open a window? Still not hotter than the battery.

I have two dogs. And have had several other dogs in the back of the Prius.
You'll probably want to use this cover and filter to keep the fur out.
Easily cleaned in the sink with just water.