EvanstonI3 wrote: ↑Sun Jan 22, 2023 11:45 am
For example, if you set a Departure Time of 9am and choose "Precondition", the car will measure the ambient air temp for awhile and keep track of the temperature of the battery pack. If the pack falls below 50F, the car will come on 3 hours in advance (in this case, 6am) and will circulate warmed coolant around the battery pack until it reaches 50F.
Our 2014 BEV didn't have the heated seat and battery pack option (not needed in our tropical climate), but it did have a heat pump. Supposedly, I would not have been able to precondition (warm) the battery cells because there were no electrical resistance heater wires below the them. However, the heat pump would have allowed me to precondition (cool) the battery cells. So I think that preconditioning (warming) the battery cells is done with resistance heating and not with the refrigerant that cools the battery cells. The refrigerant plumbing schematic doesn't indicate an obvious way to precondition (warm) both the battery pack and cabin simultaneously, and BMW's TIS Website doesn't describe preconditioning (warming) the battery cells with refrigerant, only with electrical resistance wires.
That said, a Norwegian i3 BEV owner swears that the A/C compressor turns on during preconditioning (warming) his battery pack. One explanation could be that the compressor is running so the heat pump can precondition (warm) the passenger cabin while the electric resistance wires are warming the battery cells.
[22-04-25 to now] 2019 BMW i3 Imperial Blue Metallic, Giga World, Tech + Driving Assist, Heat Pump, 428 Wheels
[14-11-05 to 22-06-15] 2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging