Battery Question

[Canuck]

We all need to keep in mind that Model S85 cars have driven hundreds of thousands oif miles without harm when charging every day to 100%.

Do you have a reference for this? It goes against the science of how lithium ion batteries work.

While it is true that li-ion do like to avoid over/under charging the Tesla BMS has pretty much eliminated the overcharge issue

Then it's really odd that Tesla has a "Daily Driving Range" in my S85 and recommends that I only use the "Trip" range (90 - 100%) for trips.

Tesla's BMS has not eliminated the "overcharge issue", as you call it but has served to mitigate the damage caused to the cathode by putting the maximum number of electrons into a lithium ion battery. That, in itself, degrades the cathode, but add heat and then the real problems arise (just see how the Leaf owners in hot climates batteries degraded -- and fast). Tesla BMS includes thermal management (you can hear it humming away at a supercharger on a hot day). To suggest none of this is degrading the battery and charging your battery to 100% every day is without harm, is not true, at least from my reading of the science.

 

[Chopr147]

Well, the S has the 60kwh and I get 219 miles. The EPA of 219 is accurate I have noticed.
The Model 3 will be much lighter than the S and the 215 was given as the approx. mileage. I bet it is higher than that for a 55kwh battery. With the Bolt advertising 238 on a 60kwh battery the 3 will have choices to make it higher. The 55 probably will be lower than the lighter Bolt

 

[jonnyg]

Well, the S has the 60kwh and I get 219 miles. The EPA of 219 is accurate I have noticed.
The Model 3 will be much lighter than the S and the 215 was given as the approx. mileage. I bet it is higher than that for a 55kwh battery. With the Bolt advertising 238 on a 60kwh battery the 3 will have choices to make it higher. The 55 probably will be lower than the lighter Bolt

I haven't read too much about the Bolt, but I thought I saw something from one of those test drives a month or so ago where the driver used a little over 60 kwh during their drive. They speculated it was more like 60 usable, so maybe it's actually a 70kwh battery in the Bolt?

 

[jonnyg]

Found the article: 2017 Chevrolet Bolt EV first drive: 240 miles in an electric car

It was actually 58.7 kwh used during their trip. Seems unlikely it's a 60 kwh battery, has to be 60 useable.