Why the slow charge rates?

Discussion in 'General' started by David Mc, Aug 10, 2021.

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  1. David Mc

    David Mc New Member

    I'm new here and didn't find this in search, but I'm wondering if anyone can summarize for me why every newly arriving EV isn't capable of DC charging at 350 to future proof our cars? Since much of this site is future vehicles. Can only a couple battery chemistries charge fast? Does the fastest onboard charger cost many thousands more? The Ioniq 5 can, so it isn't just the Taycan. I get that my 2017 Bolt couldn't at the time but the 2022 Bolt EUV charges just as slow although it has the same pack as my '17. Next years charging stations could be 800 but what good is that if the only cars we can buy charge at 125? Within reason, my car should be able to charge faster than anything I plug it into.
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  3. One reason it's that 800V tech. The car is still a 400V car but it switches cells into serial for charging (at least that's how I understand it, please correct me if I'm wrong). So that's additional electronics.

    Battery chemistry probably plays a role and even though we hear about me developments in the media a lot, it takes a lot longer for these things to actually get into production.

    Take Tesla's newer 80 something cells. They are not even close to full scale production yet.
  4. bwilson4web

    bwilson4web Well-Known Member Subscriber

    • heat - charging will create heat from the internal cell resistance. This heat needs to be removed to avoid material damage, melting spots in the separator making a permanent short.
    • long life - faster charging tends to induce irreversible chemical changes that can lockup free lithium ions and reduce cell capacity.
    • mechanical stress - the pouch and prismatic cells need external compression and as the charging speed increases, the mechanical stress increases too.
    There may be other limitations. In contrast, Tesla seeks efficiency so the charge rate of miles/hr is more important than a single metric, charge rate.

    Bob Wilson
    Kirk likes this.
  5. Currently, I believe only Hyundai/Kia and Porsche/Audi have announced new production EVs with 800V charging systems. But it is coming, so yeah, if you are thinking about future proofing, that is what to look for.
    Kirk likes this.

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