alohart wrote: ↑
Thu Jan 13, 2022 6:16 pm
You are basing your assertion on the output of the Electrified app that indicates a battery pack voltage of 402 V, and then you assume that this is the maximum possible voltage for a pack of 96 120 Ah cells. Pack voltage is temperature-dependent, so did you correct this voltage for the cell temperature?
On the lower left corner of the screenshots you see the (max.) voltage on cell level and beside that with smaller numbers the range between lowest and highest cell voltage measurement across all cells. Both examples show 4.19V as highest cell voltage (cell levels ranging from 4.18V to 4.19V). So I do not talk about pack voltage here. The first example shows a battery temperature of 10.7 °C, so also nothing special that should be taken into account.
As you may know, most Lithium Ion cells have maximum charge voltage of 4.20 V as long as these are not special LiIon HV cells (which can be charged up to 4.35V). But those HV cells will not be found in normal automobiles due to lower cycle life times.
The 94Ah cells from Samsung SDI are specified for maximum charge voltage of 4.15V per cell and even those are charged up to 4.20 V on the i3.
So I see no indication for a buffer at the "top" end.
Arm wrote: ↑
Thu Jan 13, 2022 11:42 pm
You can limit the charge to 80% via the app but it'll have to be done manually. Rule of thumb...every 1% battery charge takes around 2.8 minutes on a 7.2 kWh charge rate for the 94aH pack.
Where can you set a charge limit of 80%?
Do you have a screenshot?