golfcart wrote: ↑
Tue Oct 22, 2019 3:35 am
SageBrush wrote: ↑
Mon Oct 21, 2019 9:24 am
Li-x batteries are OK below 60C for short periods of time, and in fact charge better at the higher temps. That is why Tesla lets the battery heat up into the 50 - 55C range during very fast DC charging, and then cools the battery down within a few minutes once charging has stopped.
I'm assuming you meant to say that Li-x batteries are OK above
60C for short periods of time, and in fact charge better at the higher temps.
I meant batteries can approach 60C for short periods of time without ill effect. The interesting detail from Bjorn's data was that cooling was not started until the battery reached 45C. I would have liked to watch the cooling ramp up as the battery temp increased but Bjorn mentioned that for now he does not have a meter for cooling. I'll watch again at higher volume; perhaps the A/C power maximum threshold can be marked by the noise increase.
Addendum: I could not discern a ramp up in noise from the battery cooling but Bjorn mentioned that he also thought that the car had a lot of untapped cooling. Perhaps the battery coolant flow can be a good surrogate gauge. I've noticed up to 20l/min through the battery, and up to 40l/min total flow through the system.
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Two years in Colorado, now in NM
03/2018: 58 Ahr, 28k miles
11/2018: 56.16 Ahr, 30k miles
2018 Tesla Model 3 LR, Delivered 6/2018