Auxiliary HV cooling fan for after-shutdown temp spikes?

There was one member on here that modified a standard printed circuit board in order to run the HV battery fan for a programmable time after the car is turned off.

 

Sounds interesting, I'd like to know more about that mod

 

I've noticed high battery temps as you describe. Seems by far the worst condition: sitting in hot sun after an extended drive.

Maybe the solar panel powered fan could be used somehow? Or an aftermarket solar panel and fan, say with the panel layed on the hatch tonneau (sic) cover?

 

It has been a while but try searching for HV Battery Fan and see what you get.

 

can't you run it manually with an obd?

 

Yes but if you are going to sit in the car and run it manually why not just leave the car Ready and let the fan run.

 

You can work out either a thermostatic control or a timer to activate the OE battery cooling fan with a lithium ion jump box like this one;

This cord plugs into he coaxial 12 volt connector of the Antigravity lithium ion jump box;

I have both and know that the polarity and plug of the cord fits. The jump box needs not t be switched on for power.

You'd have to place a diode in series to black current going block to the car's cooling circuit and rig a relay to start the power from the jump box to he OE fan for the set up to work. The same diodes might be needed to prevent a back feed to the jump box.

You can rig the charging cord supplied with the Antigravity jump box to the back cigarette lighter type 12 volt outlet to automatically charge the jump box, when the car is turned on. The input jack is separate from the 12 volt output jack.

 

a modification to the stepped-up amplifier for the variable speed battery fan was used in the early PHEV modifications, it was not complicated and required an external power source. The information surely is in the PHEV conversion archives in the Wikipedia vault.

 

I just went to my car to get something out of it, parked it in the shade 4 and a half hours ago. Actually noticed the fan turn on when I put it in ACC mode. I actually heard it turn on, rev up to about stage 3 if I had to guess? Than about 30 seconds later slow down to probably speed 2.

This actually worries me. Basically heat soaking the battery every day when I get home from work. It was about 75-80 degrees today btw.

 

surprising, i've never heard mine run. have you checked it for cleanliness?

 

I removed and cleaned it about 3 months ago

 

My ears are very sensitive

 

i'm almost deaf.

 

Well, there's why you don't hear it! It's pretty cool hearing the system do its thing, I just hate that it's out of the cars control when the car is powered down. It should have somega software to run the battery for 30 mins after shut down, and then maybe like 15 after mins after like 2 hours. Just a thought

 

I just had a thought, since prii taxi cabs are almost always running their cooling system is always running so that could be a big factor in battery longevity

 

I've seen fan speed 4, on my ScanGauge, and still can't hear it running. I think my hearing's fine, but my wife'll debate that, lol.

 

good point. i have the same problem with my gas fireplace. when you shut it off, the fan stops, even though there's a lot more heat to be extracted.

 

The other day I switched SG over to BT2 (middle temp sensor) it was reading 33C. This is with ambient temps around 8 or 9 (C). Fan wasn't even on, I'd just switched over from fan speed gauge.

 

Like Mendel I have seen my battery fan at Speed Mode 4 and did not hear the fan. My wife, who can hear a pin drop, had to put her ear to the battery vent to just barely hear the fan.

If you can hear the fan from the driver's seat you do have super- sensitive hearing.