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About LinkBacksBut these batteries lie about their capacity, so at 80% it is only the hidden over-provision 20% that isn't charged so it can declare itself "full".Originally Posted by Gerrard
But these batteries lie about their capacity, so at 80% it is only the hidden over-provision 20% that isn't charged so it can declare itself "full".
I don’t think it is hidden overprovision - slow charging is up to the full 100% as I understand it. Fast charging heats up the battery and that affects the chemistry.
Normally the charging mode changes from constant voltage to constant current at around 80% capacity - which is much slower so that last 20% would take much longer than the first 80%.
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That's all true, but AIUI battery actual capacity is higher than real capacity as that allows both charging tricks and a reserve pool so the battery doesn't appear to degrade. Let's face it, batteries do degrade so if your range doesn't then it is drawing from spare capacity.
ICE cars have a fuel gauge that is a bag of fibs, why should charging be any different?
Sort of. It's true that the battery is probably operating in the 10%-90% range of what the cells are capable of, but would be best way to preserve the number of cycles a cell can do. I am not sure if the software would be sophisticated enough to manage that range dynamically or not. It might not even be the best idea. It might be better to keep the 10%-90% cell range going and slowly lose mileage range over a longer period of time, than bumping that cell range up but at the cost of the life of the cells and then suddenly start to lose range in a shorter period of time once you run out of spare capacity. Hope I explained that clearly enough!
Early plug-ins did a lot of this "don't fully charge the cells" stuff - e.g. the Mk1 Chevrolet Volt had a 10.4kWh user-accessible drive battery - plus 3kWh for acceleration at motorway speeds after exhausting the drive battery, plus 2.6kWh of "just in case" empty battery at the top to avoid 100% charge.
I don't think anyone is really doing it any more. Those 2011-era EVs really helped the car manufacturers get confident with the capabilities of the batteries, and as long as your heating and cooling are adequate, it's not a big deal for modern battery chemistry
Out of interest, where's your source(s) for this? There have been many well-to-wheel studies, comparing with the energy / CO2 / cost of building EVs, and none of them I'm aware of claim EVs are five times worse than the dirtiest diesel...
Err..... my head.
It's a jest and a jibe, around a hypothetical situation that parodies real life past events....... and it's no longer funny once you've had to explain it.
None claimed diesel was any worse than petrol, I believe and in fact, 'scientists have proven' and 'studies have shown' that diesel is actually better for the environment.... or whatever they said in the massive diesel-drive, before all this stuff kicked off.
I just presume something similar will come to light once everyone is using an EV, too, since it seems to be the trend.
When new evidence comes to light, you are allowed to change your mind.
That was a damned long time ago now. Diesel engine technology was just mechanical pump and a simple turbo, petrol engines were usually normally aspirated with a basic sometimes even single point fuel injection system. Modern engines actually burn fuel differently, giving direct injection petrol engines with some of the diesel particulate problems and diesels doing multiple short injections into a lower compression ratio to avoid the tractor clatter. If studies, results and hence regulations failed to change then that would be the bad thing.
The point of that 90's push to adopt diesel was all about carbon emissions, where at the time electric vehicles just weren't a viable option.
Apparently not... I'm told I must change my mind now and worship at the altar of Electric Vehicularity with all the rest, or be branded a child-killing diesel demon and shunned by all society....
By all accounts, they won't be properly viable for about 10-15 years still....
But then fat was bad for you once... then it was salt.... then it was sugar.... Seems every day new evidence comes to light and the planet-saving measures we all just mass-adopted with love and glee are suddenly now the Devil's work.
I fully expect EVs to emerge as hideously dangerous, like everything else that's gone before them. That's all.
Zak33 (06-11-2018)
all of this...with bells and wrapping paper.
Post of the week, covering literally everything ever.
Just adopted?!?!?! The diesel "revolution" was twenty bleeding years go
Sugar, salt and fat weren't good for you at any point in my lifetime either. Blimey, you'll be complaining next that they took your snazzy glow in the dark watch away just because a Geiger counter went a bit clicky.
And yet people are still harping on at me about it and blaming the gub'mint, the patriarchy and whatever else militant vegans usually cite.Just adopted?!?!?! The diesel "revolution" was twenty bleeding years go
They actually tried that with my compass collection, due to the Tritium. Most just ended up with radioactive stickers slapped on them.
But still, given how everything turns out bad and gets banned, I'm presuming EVs will go the same way.
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