[57Chevy]

Do you have the car already? Figuring out the gas consumption at various speeds in the 'race' trim will give you the best info before you cut anything up. I'm picturing a 1000 mile trip broken up into 80 mile runs and huge amounts of downtime pissing about wondering how to charge it, charging it, waiting for it to cool down, swapping batteries

This is an interesting story about why battery cooling is useful https://cleantechnica.com/2019/05/04/a-1200-mile-journey-testing-the-limits-of-the-2018-nissan-leaf/

Can you name the competition or the rules or something? Right now it looks like a non-engineer trying to outsource engineering (aka help) to a bunch of random grumpy internet dwellers, while wanting to achieve non-engineering goals that override the engineering. These never end well.

 

[brian_]

Assumption: Tesla batteries are most energydense. ... They charge faster & more efficient than alternatives. (I believe this was stated on a YouTube channel).

There's all sorts of nonsense on YouTube channels. Unless someone provides test data, I would assume that they are just repeating rumours.

 

[brian_]

Well, my idea was to swap the trunk pack at charging Points. I read somewhere (this is successfully attempted before) that a different pack runs a different BMS and needs to be physically connected and disconnected from the inverter. At that Point you disconnect the other pack.

You're describing two packs which are used as two separate batteries, only one at a time connected to the inverter. That fixes the problem of connecting two packs at dissimilar voltages to each other, but how does the built-in (not swappable) pack ever get charged?

But any battery that Runs on empty is Dead weight.

It's even worse than that. Using two half-sized batteries instead of one whole-sized battery means that whenever you are using or charging a battery, you're doing it at double the rate (relative to battery capacity)... which is less efficient.

You're designing a solution to a problem which is very specific to your use - which is why no production EV does this - so to get the right solution you need to understand your specific situation very well. By that I mean having a very specific plan for distance travelled, energy consumed, and peak power required for each leg between service locations, and how much time and charging power is available at those locations.

 

[Toretto]

There is NO competition. Think of it this way then.
We just like to go on long drives.

Autobahn is unlimited speed, so that gives us much room to play with top speed...

Thanks for all of your input, gives me stuff to think about.

 

[Electric Land Cruiser]

Just buy a Model S and be sure to pay for supercharging.

 

[SuperV8]

There is NO competition. Think of it this way then.
We just like to go on long drives.

Autobahn is unlimited speed, so that gives us much room to play with top speed...

Thanks for all of your input, gives me stuff to think about.

I couldn't see anywhere where you mention the maximum distance you will have to go between chargers?
This for me would be critical in sizing any battery so I could go that far plus a 10-20% buffer - at 80mph.