"Electric car range anxiety to be cured by battery that charges in five minutes"

May 19, 2021 Last reply: 5 years ago 213 Replies

I didn't say that I said revenue neutral - replacing fuel duty with per mile charging, but setting the rate so that it is a direct replacement, raising neither more nor less.

Which should not be allowed. Charging on top of charging!

Well if they can put one in a sub a ferry shouldn't be too difficult.

Of course it isn't. Only public ignorance and superstition stops us

And possibly getting it insured?

Tim

Again, only public ignorance and superstition stops us

Example of tech.

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Now, can you make money doing that ?

Paul

It does not help that fashion is pushing cars away from nice streamlined shapes into things with the aerodynamics of a brick.

Andy

I think you'll also find that there's a fair bit of Engineering in modern breweries. Without that the piss-up would be rather hard to arrange.

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Andy

There are some which are OK.

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This one is the one with Cd=0.045 . The guy inside is pedaling. The shape of this one, shows you what it would take to make the Cd really low.

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Because a BEV doesn't need quite as much air intake, there's room to improve it over an ICE vehicle. If you put more of the junk in the back of the car, the front profile can be improved. Of course, done to extreme, it might throw off the handling. But with the battery pack being centered and down low, that does a lot to reduce the impact of the rest of it.

BEVs are all about wind resistance, whether frontal or side resistance. The above article mentions "wheel covers" several times. And regenerative braking makes this a bit more feasible. The Taycan for example, has almost full regeneration and can brake mostly electrically. Other cars don't achieve quite the same level of regen braking. You cannot eliminate friction brakes, but you can reduce their usage, a lot. And that might help, in situations where a stupid wheel cover is in place (less effective brake disc cooling).

Since I have spent a lot of money on brakes over the years, I feel the presence of friction brakes is a horrible idea, and will be a revenue generator for somebody. I doubt any car manufacturer has put effort into extending BEV brake life.

Since range anxiety is all the rage, expect to see a lot of wheel covers and the like, to give better mileage numbers. Things that an ICE car would not care about (as nobody really cares about ICE MPG any more - reducing car emissions is more important than MPG).

Musk thinks the Cybertruck will be Cd=0.3, whereas some others are about 0.4. The devil is in the small details (putting a cover on the bottom of the vehicle, which doubles as intrusion prevention to the battery pack). Expect some tradeoff of additional mass, for better Cd.

Paul

Wrong. The other problem is the stupid cost for what is at most an hour charging which is no use at all for most.

Well it doesn't help fuel economy of course. But so what. Plenty of uranium and thorium around :-)

Don't be silly. You can charge any lithium battery fully in an hour And last time I did the trip it was longer than an hour

F*ck all EVs can do that without reducing the life of the already stupidly expensive battery.

Doesn?t happen with the bulk of the cross channel ferries.

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"Energy cells should be charged at a C-rate below 1C. <=== BEV recommendation Going above 1C increases stress that reflects in rapid capacity degradation. Ultrafast charging is most effective between a SoC of 20?50%. The onboard BMS only applies full boosts in this level where charge acceptance is highest before lowering the current to a more moderate level.

The power cell is more rugged and can be charged faster than the energy cell. Power cells are commonly used for power tools. They deliver high current, have a wide temperature range but store less energy than the energy cell. "

And that recommendation in the first paragraph, can be seen in the charge curves for the Model 3 and the Taycan, which hammer in the charge, on the left side of the curve, and back off, on the right side of the curve (top up). (And that's only during fast charging. Not household charging at some lower rate.)

And as Figure 2 shows, the cars with a battery warranty "stretch" battery life by disabling fast charging. The firmware studies the charging pattern, to discover when too much fast charging has been going on (because the capacity reduction, when extrapolated, will result in a warranty claim for a new battery).

So while this Israeli company makes P.R. points with its story, it remains to be seen whether such a development can charge in

5 minutes... forever. Maybe 5 minute charges the first 200 times, then some lower level for the rest of the vehicle life.

Lithium batteries also have a recommended discharge rate. Which is different for Power versus Energy batteries. Doing too many burnouts in your Model 3, might not be good for it either. The Tesla Power Wall, you're supposed to spend two or three hours discharging it. It would not be suitable as a fast charger for your car, unless sufficient of them operated in parallel. Perhaps a Tesla Powerwall with Power cells in it, would be a better device for car charging. But, with only half of the total storage capacity.

Home charging still makes the most sense. Even if it doesn't offer the same quality of service as an ICE.

Paul

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