Pedrodemio
100 W
As an enthusiast for all things electric, I've always wondered what allows fast charging
Lets take the Model 3 as the prime example at the current date, capable of a 250 kW peak charging rate, with a 96s46p, taking into account that that peak only happens at low state of charge, we are taking about 15 A charge current per cell, in a lot of information around the web and on this forum, we see cells taking a beating on cycle life at much lower currents, probably due to keeping a high charge current up until the CV phase
Now, one fact is clear, they only can do that with a hot battery, if we take this video into account, it's around 43°C that full speed is reached, and the temperature is allowed to climb even higher. Unfortunately I haven't found the same data for a Supercharger V3 that can deliver the full 250 kW, maybe the full speed indeed need closer to 50°C, my guess would be explained due to Arrhenius equation in allowing the reactions to occur faster
https://www.youtube.com/watch?v=SVm3muFrJbA&feature=youtu.be
Now to the question, if we were to get some other high energy cells, i.e. Sanyo NCR18650GA, Samsung INR18650-35E and INR2170-50E and many others, have a proper temperature control system capable of both heating up the cell to these high temperatures to prepare for charging and also cooling them down fast after charge is complete to lower calendar degradation rate, and probably doing a bunch of tweaking on the actual charge curve profile and temperatures, would be possible to achieve this fast charge rate with little effect to calendar life on other cells or there is more to it?
Lets take the Model 3 as the prime example at the current date, capable of a 250 kW peak charging rate, with a 96s46p, taking into account that that peak only happens at low state of charge, we are taking about 15 A charge current per cell, in a lot of information around the web and on this forum, we see cells taking a beating on cycle life at much lower currents, probably due to keeping a high charge current up until the CV phase
Now, one fact is clear, they only can do that with a hot battery, if we take this video into account, it's around 43°C that full speed is reached, and the temperature is allowed to climb even higher. Unfortunately I haven't found the same data for a Supercharger V3 that can deliver the full 250 kW, maybe the full speed indeed need closer to 50°C, my guess would be explained due to Arrhenius equation in allowing the reactions to occur faster
https://www.youtube.com/watch?v=SVm3muFrJbA&feature=youtu.be
Now to the question, if we were to get some other high energy cells, i.e. Sanyo NCR18650GA, Samsung INR18650-35E and INR2170-50E and many others, have a proper temperature control system capable of both heating up the cell to these high temperatures to prepare for charging and also cooling them down fast after charge is complete to lower calendar degradation rate, and probably doing a bunch of tweaking on the actual charge curve profile and temperatures, would be possible to achieve this fast charge rate with little effect to calendar life on other cells or there is more to it?