rs38
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- Nov 16, 2020
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- west germany
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- taycan,gt2,i8
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I like to provide some facts about charging Taycan I just was able to log.
Here you see an approx. 7 month old MJ21 Taycan with quite cold battery while charging at a 300kW HPC from Alpitronic, quite common in Europe.
Checked upfront: "fast" State of Health says 93% with only 7000km on the odo.
I'm still working on the nicer display, but I will explain a bit more:
Start of charge was at:
16,3% SoC displayed, while the internal BMS value was at 21%, which is also a nice hint for net/gross capacity.
695V HV- and 3,5V cell voltage and 17°C battery temp.
At that time BMS allows a maximum of 90A (63kW) under that medium cold conditions.
The battery heating starts (see cooling inlet and outlet) and rises to 25 degrees while increasingly using the PTC heating up to 10 amps. (and burning quite some energy).
Small way point at about 21°C battery and 29% SoC display (32% internal): now the BMS did enough active heating and switches off the heater. Inlet and outlet become more and more equal, still a rather little charge current is allowed (110A)
Reaching max. charging power for that session at approx. 150kW and 195A in a jump at 27 degrees battery temperature. SoC 44 vs. 46%.
This speed lasts until 53/54% SoC, battery is now at 30 degrees celsius and then abruptly drops to about 100 kW (130A). I am not quite sure if a power limitation at the quite big carging station occurred.
Reaching batt temp of 32°C active cooling started. Nice to see, keeping Inlet < Outlet and no more PTC current. Also the A/C compressor is clearly audible in the car.
At 66% SoC we stopped charging only to see if other (better) max charge current would be allowed on a restart. Obviously not in that case.
Nice to see the cell voltage inertia slowly go down towards OCV after stopping the charge.
https://www.batemo.de/products/batemo-cell-library/e66a/ -> pulse characteristics
Charging continues at 130A until 78% SoC then with continuous decreasing current to 85/86% SoC . Battery temp can be hold at 33°C.
Hope you enjoyed that inside view into a cold battery charging session.
Here you see an approx. 7 month old MJ21 Taycan with quite cold battery while charging at a 300kW HPC from Alpitronic, quite common in Europe.
Checked upfront: "fast" State of Health says 93% with only 7000km on the odo.
I'm still working on the nicer display, but I will explain a bit more:
Start of charge was at:
16,3% SoC displayed, while the internal BMS value was at 21%, which is also a nice hint for net/gross capacity.
695V HV- and 3,5V cell voltage and 17°C battery temp.
At that time BMS allows a maximum of 90A (63kW) under that medium cold conditions.
The battery heating starts (see cooling inlet and outlet) and rises to 25 degrees while increasingly using the PTC heating up to 10 amps. (and burning quite some energy).
Small way point at about 21°C battery and 29% SoC display (32% internal): now the BMS did enough active heating and switches off the heater. Inlet and outlet become more and more equal, still a rather little charge current is allowed (110A)
Reaching max. charging power for that session at approx. 150kW and 195A in a jump at 27 degrees battery temperature. SoC 44 vs. 46%.
This speed lasts until 53/54% SoC, battery is now at 30 degrees celsius and then abruptly drops to about 100 kW (130A). I am not quite sure if a power limitation at the quite big carging station occurred.
Reaching batt temp of 32°C active cooling started. Nice to see, keeping Inlet < Outlet and no more PTC current. Also the A/C compressor is clearly audible in the car.
At 66% SoC we stopped charging only to see if other (better) max charge current would be allowed on a restart. Obviously not in that case.
Nice to see the cell voltage inertia slowly go down towards OCV after stopping the charge.
https://www.batemo.de/products/batemo-cell-library/e66a/ -> pulse characteristics
Charging continues at 130A until 78% SoC then with continuous decreasing current to 85/86% SoC . Battery temp can be hold at 33°C.
Hope you enjoyed that inside view into a cold battery charging session.
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