Recent content by egn1

@Compton The shown graph is missleading, because it doesn't contain data up to now. If you add data of vehicles experiencing the Battery Gate you see a considerable jump down. Additionally they can only charge at SuCs at half the speed of new cars. And if you analyse the above graph you see...

NMC of Audi/Porsche has a much better lifetime and fast charging ability than NCA. This is also the reason why Tesla uses NMC for energy storage and not NCA, which is dead after about 500 full cyles or 1200-1400 typical charge cycles, that EM mentioned in the investor call after indroduction of...

On the other side the Taycan has at 150 km/h a similar range as the Model 3 LR RWD. There is still a large difference between EPA and reality. Charging Speed of Taycan is also much better. Here in there is a considerable drop of charging speed during winter, not only because of charge...

IMHO the changes Tesla has made are all connected to the same problem - lithium plating and the consequence - growing of dendrites. First of all, lithium plating is caused by lithium ions, that cannot intercalate into the crystal lattice of the graphite anode fast enough. Intercalation rate is...

Regen is limited to a value so that no cell surpasses 4.20 V.

Actually partly it does, because if one cell has lower capacity or higher IR than others the brick voltage will rise faster at charging and reach the termination voltage earlier, and will also fall faster and cause shutdown earlier. Balancing doesn't help much here, because cells are balanced...

The focus is not only on range, it is also on charging speed, which also has been reduced considerably. Both together have resulted in acceptable travel time before the firmware change.

Another sudden fire in Germany.

Running the coolant pump for a short time is probably the only possibility to measure current temperature of the cells. The temperature sensors are sitting at the inlet and the outlet of the cooling loop of each battery module. You can see the values with ScanMyTesla or TM-Spy.

This seems to be a good analogy. You can even extent this to the following: Imagine that the fuel tank of an ICE is punctured at the top end, and when the tank is filled to 100 % some fuel is sipping out, and causes fire danger. Instead of fixing the fuel tank or replacing it all together, the...

Static voltage is irrelevant when charging and stopping charging at a specific voltage.

The following image shows NCA cell voltage on low-current charging: Source So 4,1 V during charging means approximately 90 % SOC.

This is far from enough to warm the battery to best superchargering temperature around 100 F.

The question is whether this is caused by positive effect on dendrite growth, or because most user of superchargers charge only to a lower SOC and the battery is immediately after charging. Tesloop had supercharged its first Tesla always to 100 % and got a battery replacement at 200,000 miles.

It is very easy for the BMS to keep the voltage below a specific value in batteries with multiple cells in series. Actually, it is the main purpose of the BMS to keep voltage of all series cells within a specific voltage range. Lithium plating happens also on much lower voltage than 4.2 V...