scottf200
Well-known member
You were asking about cooling so it did not appear you understood the biggest issue ... current battery chemistry and how it accepts a charge. Hope my details helped in that regard. Battery cooling and charger cable/connection cooling certainly are an issue but if they were the weak link then they would have been addressed quickly. There has been some efforts but not major ones. There are other more restrictive weak links to deal with first.webb14leafs said:scottf200 said:You need to read up on the several factors. Start here but lot of places to read and learn:webb14leafs said:<snip>
Why doesn't the same argument hold for this ratio? Cooling technology?
http://teslapedia.org/model-s/tesla-driver/understanding-charging-rates/
Also related is how the pack is arranged. i.e. 120kW mentioned above. Info via:
https://forums.tesla.com/forum/forums/400-kw-charging
georgehawley.fl.us | December 6, 2016
Haven't encountered a Supercharger operating over 120 kW yet.
The limits charging power that a battery pack can accept is the maximum amount of current the manufacturer is willing to tolerate in the individual cells and the way the cells are wired together for charging purposes.
Panasonic recommends 2 amperes maximum at 4.2 volts per cell for charging the 18650 cells used by Tesla. Tesla charges them with up to 4 amperes at 4.2 volts. In the 85 and 90 kWh packs Tesla has 96 strings of 74 cells in parallel. 74 X 4 amperes = 296 amperes maximum. 96 X 4.2 volts = 403.2 volts. 403.2 X 296 = 119.3. kW. [note the 120 kW mentioned above]
For a Supercharger to charge a 60 kWh pack, the SC regulates the voltage and current to suit the smaller batter pack configuration. Likewise a 145 kW-capable SC hooked up to a 90 kWh pack.
I think everyone is stuck in the present. I'm simply pointing out the fact that Tesla clearly plans on changing their battery technology to allow for faster charging, or else they wouldn't upgrade their existing charging stations. In the age of acceleration and with someone like Musk this change "could" happen as quickly as a year or two. The other manufacturers will eventually follow suit. If I bought a new Leaf in January, and by 2019 there were new ones that could charge in 20 minutes instead of 50, I would be annoyed.