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Captain Hybrid

BMW Pushes for Broader EV Adoption With New Charger

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Charles Murray
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Re: Energy Out > Energy In
Charles Murray   8/8/2014 5:36:54 PM
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Ratsky is definitely correct. Overcharge is an issue. That's why we hear about 80% charges during fast charges. Engineers compare it to filling a coffee cup -- you can put the first 80% in real quickly, then you have slow it down as you reach the brim of the cup to keep it from overflowing.

Ralphy Boy
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Re: Energy Out > Energy In
Ralphy Boy   8/8/2014 5:21:40 PM
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Speaking of overcharge...

What happens to the charging capacity (in terms of cars per unit) when some zealous EV owners start getting to the public charger at say 5am and then work 10 hrs, plus takes a 1 hr lunchs and in doing so tie up the chargers for 11 hrs?

Just a thought.

But I do like the 30 min charge time. Maybe it could be designed to spit out and retract the plug at full or some other predetermined charge/dollar amount. Could reduce the number of "punched in the nose" scenarios discussed in the posts on this board.

http://www.plugincars.com/eight-rules-electric-vehicle-etiquette-127513.html%20

Especially in the bottom half... It shows that all is not utopic in EV land. And sooner or later the wrong guy might just have had a bad day when he sees someone unplugging/line jumping his ride home.

fm
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Re: Energy Out > Energy In
fm   8/8/2014 4:18:22 PM
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@Ratsky, thanks.

OK, so i did a little searching. Battery University has the following explanation for what happens when you overcharge a LiIon battery:

"Lithium-ion operates safely within the designated operating voltages; however, the battery becomes unstable if inadvertently charged to a higher than specified voltage. Prolonged charging above 4.30V forms plating of metallic lithium on the anode, while the cathode material becomes an oxidizing agent, loses stability and produces carbon dioxide (CO2). The cell pressure rises, and if charging is allowed to continue the current interrupt device (CID) responsible for cell safety disconnects the current at 1,380kPa (200psi).

Should the pressure rise further, a safety membrane bursts open at 3,450kPa (500psi) and the cell might eventually vent with flame."

... maybe it's just me, but the (understated) term "vent with flame" doesn't sound like a good thing!

Ratsky
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Re: Energy Out > Energy In
Ratsky   8/8/2014 12:37:55 PM
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@ fm: Multiple mechanisms involved.  I don't know the details, just the warnings I get from the vehicle manufacturer (these are earlyish prototypes).  Explosion and fire are the biggies, but drastic reduction in capacity is something we actually experienced more than once.  All due to SW bugs in the charge manager that subsequently failed to properly protect the battery packs.

fm
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Re: Energy Out > Energy In
fm   8/8/2014 12:19:17 PM
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@Ratsky, i had not heard of overcharge being an issue. Are the new chemistries more sensitive to that? What's the failure mechanism: chemical or heat or ...?

Ratsky
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Re: Energy Out > Energy In
Ratsky   8/8/2014 11:36:39 AM
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The EVs I test with have the charge manager set to keep the battery in the 20 to 80% range (which gets reported to the user as 0-100%).  Overcharge is as big an issue as total discharge.

Ratsky
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Re: Energy Out > Energy In
Ratsky   8/8/2014 11:28:22 AM
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I think my old boss's house is 3-phase.  It's really more like a mansion/compound on 35 acres.... completely computerized automation.  He hasn't sprung for a true EV yet, though.  Drives hybrids and has for years.  Likely main reason is range as he lives WAY out in the countryside.

Charles Murray
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Re: Energy Out > Energy In
Charles Murray   8/7/2014 6:46:15 PM
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Battar, your home is wired for three-phase? I'm with G-whiz on this. I don't know anyone who has it at their home.

Charles Murray
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Re: BMW fast charger
Charles Murray   8/7/2014 6:40:18 PM
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The charger will be available to any car that uses an SAE 1 standard connector, naperlou, which would also include GM, Ford and VW. Japanese automakers, however, are leaning toward the Japan-developed CHAdeMO standard connector.

Charles Murray
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Re: BMW fast charger
Charles Murray   8/7/2014 6:35:17 PM
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The chargers will get to public places eventually, Gorksi. The dealers are only a first step.

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