AJI wrote: ↑08 Feb 2020, 00:22
Andres125sx wrote: ↑07 Feb 2020, 20:31
... If 650km are not enogh just wait for next generation of batteries...
I've been waiting for a while now, as have you, no? Just re-read some of your posts about emerging battery tech from years ago.
I'm not saying it's not going to happen, but I believe you and me belong to the optimists side of the battery tech argument, and it's getting tiresome perpetually being disappointed...
Agree completely, but lately I´ve become a bit more optimistic again, thanks to Nikola announcement of their new battery with 4x the energy density of current LiIon tech. We´ll see how real it is...
https://nikolamotor.com/press_releases/ ... ld-2020-67
Even a half of their claims (2x energy density) would be a game changer
AJI wrote: ↑08 Feb 2020, 00:22
It also ticks another box you didn´t ask for, but surely you´d be happy with it. 0-60mph in 3 seconds
This is the biggest red herring out there.
BEV's are a one-trick-pony in this respect.
Who really cares if your BEV can out accelerate an ICE super car? Back in the real world, if you offer 0-100 in 7 seconds and a 5 minute charge or a car that takes 30 minutes to charge, but can do 0-100 in 3 seconds, which one will you choose?
The fact is, BEV manufacturers can't offer option 1, so they push option 2 like it's something everyone needs...
Not exactly, they don´t push for option 2, that´s just an added bonus of a huge battery to increase range. Charging and discharging capacity depends on battery capacity, it´s defined by battery capacity actually (for example 10C, wich means 10 times the capacity, ie. a 100kWh battery will provide 100kW x 10 = 1000kw... so if the battery is bigger it will provide more power and they can use more powerful motors, specially when weight penalty for a powerful electric motor is minor compared to ICEs
Since they´re using a huge battery (180kWh) to provide more than 600km range, they can also use powerful motors and provide hypercar acceleration. They´re not choosing hypercar acceleration instead of faster charge times, for faster charge times you need to improve battery tech to improve charging rates, while for hypercar acceleration they don´t need a new battery tech, just a bigger battery wich is what they did anycase to improve range. An added bonus, not something they were looking for
Edit: actually increasing battery size they´re also reducing charging times... for a given range. Charging rates will be the same, if a battery needs 30 minutes to fully charge it will still need 30 minutes to fully charge, but charging 180kWh in those 30 minutes instead of a 60kWh wich is a more common battery size. Same charging times, but charging a lot more energy, so if you just want to charge what´s needed to cover 100km, with this Rivian (600km range) it will take a sixth of its complete charging times (in the example, 30minutes /6 = 5 minutes), while any car with a 60kWh battery wich should provide around 250km range, to cover 100km will need 30 minutes /2.5 = 12 minutes.
So doubling battery size they double range, but also half charging times for a given distance (not if you just want to fully charge it tough)