Pre-conditioning up to a certain (74f?) HVB battery temperature

[Billyk24]

Seen today, identified a Tesla SuperCharger location in Android Auto. Car began warming the battery pack (temperature) and then 4 miles from the charging station, it stopped warming the battery pack at 73 or 74f. Struggling to transfer photos from my photo. Walmart here we come for prints.

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[Mach-Lee]

Yes, the target battery preconditioning temperature is 23ºC or 73ºF. The heater will turn off when that temperature is reached, and the circulation pump will continue to run. The heater will cycle back on again if the battery temp drops below about 20ºC.

Other manufacturers use a higher target temp of 30ºC+ to support high amperage charging, but since the Mach-E does not DC charge at a very high C rate, it may be pointless to go warmer.

 

[Billyk24]

Yes, the target battery preconditioning temperature is 23ºC or 73ºF. The heater will turn off when that temperature is reached, and the circulation pump will continue to run. The heater will cycle back on again if the battery temp drops below about 20ºC.

Other manufacturers use a higher target temp of 30ºC+ to support high amperage charging, but since the Mach-E does not DC charge at a very high C rate, it may be pointless to go warmer.

That means those in the warmer states during warm weather really do not need to worry about pre conditoning prior to dcfc sessions.

 

[AZBill]

That means those in the warmer states during warm weather really do not need to worry about pre conditoning prior to dcfc sessions.

When the battery is hot, it will try to cool it to about 90F. Ideal temp range for fast charging is 70-90.

 

[Billyk24]

When the battery is hot, it will try to cool it to about 90F. Ideal temp range for fast charging is 70-90.

Won't the car try to cool the hvb temperature without pre conditioning?

 

[AZBill]

Won't the car try to cool the hvb temperature without pre conditioning?

My Rivian has a battery temp indicator and it will stay between 100 and1 110 while driving. I live in Phoenix and these ambient temps are normal.

 

[E90alex]

This is why fast charge preconditioning really isn’t that big of an issue that people make it out to be unless it’s winter time.

 

[Billyk24]

My Rivian has a battery temp indicator and it will stay between 100 and1 110 while driving. I live in Phoenix and these ambient temps are normal.

I ask because during road tripping during warm summer months a dcfc on my Mache can raise the hvb temperature into upper 90's if not low 100's. Then I notice the vehicle actively cooling the hvb so it drops 8 to 10f. Of course my summer heat is not as hot as Arizona.

 

[Mache_Nor]

Do we know if the precondition cools battery? On long road trips on hot days this would be quite nice, but thought the function was only heating. Do you know @Mach-Lee?

 

[Mach-Lee]

Do we know if the precondition cools battery? On long road trips on hot days this would be quite nice, but thought the function was only heating. Do you know @Mach-Lee?

I'm not sure because my climate doesn't often get hot enough to test that. So if some people in the southern USA with Car Scanner could examine that, go for it. You'll have to look for a big drop in HVB coolant inlet temp (below ambient) to see when cooling is happening.

IIRC the battery will automatically cool itself while driving when it gets above 35ºC/95ºF, unless the cabin A/C load is too high. I'm not sure if entering a charger will cool it further than that or not. Again, we would need some folks to test that out when it's that hot outside.

Preconditioning is much more important in the winter when the battery is significantly further away from the ideal temp.

 

[AZBill]

I ask because during road tripping during warm summer months a dcfc on my Mache can raise the hvb temperature into upper 90's if not low 100's. Then I notice the vehicle actively cooling the hvb so it drops 8 to 10f. Of course my summer heat is not as hot as Arizona.

Here is a good article about fast charging temps and what is the acceptable range.

https://www.chilbattery.com/blog/wh...erature-for-a-lithium-ion-battery-125890.html

 

[Billyk24]

Here is a good article about fast charging temps and what is the acceptable range.

https://www.chilbattery.com/blog/wh...erature-for-a-lithium-ion-battery-125890.html

Old article when it States some high end vehicles come with thermal cooling system for their battery.

 

[emichnov]

Road tripped from MA to TX in April. Had to pre-condition for the first few stops because it was cold, but once I was past Washington, DC, the ambient was warm enough I was getting max charge rates (150KW+) every time without pre-conditioning. So, I think the battery is more tolerant than having to be at exactly 73 degree F to charge at max rates. Preconditioning doesn't get you much unless it is very cold.

 

[RickMachE]

Road tripped from MA to TX in April. Had to pre-condition for the first few stops because it was cold, but once I was past Washington, DC, the ambient was warm enough I was getting max charge rates (150KW+) every time without pre-conditioning. So, I think the battery is more tolerant than having to be at exactly 73 degree F to charge at max rates. Preconditioning doesn't get you much unless it is very cold.

The only way to know what it's doing is with an app like CarScanner. What you'll see is heat going to the battery even at temps in the 50s and 60s. You don't notice it because it doesn't have a strong visual impact on charging speed like arriving at a charger with a 30 degree battery does.

 

[Billyk24]

The only way to know what it's doing is with an app like CarScanner. What you'll see is heat going to the battery even at temps in the 50s and 60s. You don't notice it because it doesn't have a strong visual impact on charging speed like arriving at a charger with a 30 degree battery does.

Just road tripped 820 miles. Pre conditioning does not cool the battery pack at 90 or upper 80s via car scanner pro. Dcfc for 20 minutes would raise hvb f temperature to upper 90s or like 102f and then one would see the temperature drop 6 to 8 f during the next hour. Another 4 to 6 f during the 2nd hour. This was during upper 70f to upper 80f outdoor temperatures.

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