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It is indeed totally insane, but this is what is being worked on, not necessairly for cars but trucks and semi trucks for example that have much larger batterie

It is indeed totally insane, but this is what is being worked on, not necessairly for cars but trucks and semi trucks for example that have much larger batteries than a car. Already to achieve 250+ kW charging stations have to have huge cables and watercooled connectors, here's one such installation I saw some years ago https://i.imgur.com/BpG4QAa.jpg https://i.imgur.com/BpG4QAa.jpg and an example of a cooled connector for 0.5 MW https://www.phoenixcontact.com/en-ca/products/dc-charging-cable-ev-t1hpcc-dc500a-50m50ecbk11-1085658 https://www.phoenixcontact.com/en-ca/products/dc-charging-ca...

rootusrootus 3y ago
I assume the next jump in power will come from voltage. A Model 3 pulls ~600A when charging at 250kW, because it's relatively low voltage. If they alter the charging design to accept 800 or 1000V we could see over half a MW without a change in cable design. But I'd guess at this point that would be moot because the cell charging rate is the real limit anyway.
- Kirby64 3y ago
  Migrating to higher voltage doesn't do anything to charge batteries faster. The only advantage is that you can decrease the size of the cabling since current goes down. On the other side though, you need to move all drive circuitry, motors, etc, to handle higher voltage architecture, which may end of costing more overall.
  - cyberax 3y ago
    Not necessarily. Ford uses a 400V-based architecture, but it can charge at 800V by connected two sections of the battery in series.
    - Kirby64 3y ago
      So, you add the complexity of having to have a way to switch between 400V and 800V safely, which costs some amount of money, and the only advantage then is the cabling from the battery to the charging port can be thinner? That really doesn't seem like much savings, and if anything might cost more. The run from the charging port to the battery should already be really short.
      - cyberax 3y ago
        800V for charging allows faster charging on CCS, because the existing stations are mainly current-limited. It won't be necessary on NACS. I think that Ford just wants to switch to 800V anyway, and 400V is just a stopgap.
- bloggie 3y ago
  Yes Porsche has started with this, they have ~800 V batteries, as you said batteries themselves are the practical limit at the moment but both larger batteries (as with trucks) and new battery technology can help to lift that limit. There are enough engineering challenges at 1000 A I don't think we will see higher currents than that for a while!
- panick21_ 3y ago
  All indication point to that the Cybertruck will be the first new architecture with a 1000V architecture. Many others have standardized on 800V, for example the Koreans.

rootusrootus 3y ago

I assume the next jump in power will come from voltage. A Model 3 pulls ~600A when charging at 250kW, because it's relatively low voltage. If they alter the charging design to accept 800 or 1000V we could see over half a MW without a change in cable design. But I'd guess at this point that would be moot because the cell charging rate is the real limit anyway.

Kirby64 3y ago
Migrating to higher voltage doesn't do anything to charge batteries faster. The only advantage is that you can decrease the size of the cabling since current goes down. On the other side though, you need to move all drive circuitry, motors, etc, to handle higher voltage architecture, which may end of costing more overall.
- cyberax 3y ago
  Not necessarily. Ford uses a 400V-based architecture, but it can charge at 800V by connected two sections of the battery in series.
  - Kirby64 3y ago
    So, you add the complexity of having to have a way to switch between 400V and 800V safely, which costs some amount of money, and the only advantage then is the cabling from the battery to the charging port can be thinner? That really doesn't seem like much savings, and if anything might cost more. The run from the charging port to the battery should already be really short.
    - cyberax 3y ago
      800V for charging allows faster charging on CCS, because the existing stations are mainly current-limited. It won't be necessary on NACS. I think that Ford just wants to switch to 800V anyway, and 400V is just a stopgap.
bloggie 3y ago
Yes Porsche has started with this, they have ~800 V batteries, as you said batteries themselves are the practical limit at the moment but both larger batteries (as with trucks) and new battery technology can help to lift that limit. There are enough engineering challenges at 1000 A I don't think we will see higher currents than that for a while!
panick21_ 3y ago
All indication point to that the Cybertruck will be the first new architecture with a 1000V architecture. Many others have standardized on 800V, for example the Koreans.