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Researchers Develop Quick-Charging Li Battery Architecture

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Elizabeth M
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Re: Dose of reality, please
Elizabeth M   7/17/2014 4:29:27 AM
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Exactly, Chuck. I really thought of this more of a solution for smaller devices that we'd still like to re-charge super fast.

Charles Murray
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Re: Dose of reality, please
Charles Murray   7/16/2014 7:09:31 PM
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I agree, Liz. I don't see this making it into vehicles applications any time in the foreseeable future. As Ratsky points out, the numbers don't support that. The current levels would be ridiculously high. But I would imagine there are smaller battery applications where this might make sense.  

Trenth
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You fast charge using another big battery pack. not AC.
Trenth   7/16/2014 7:08:01 PM
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You can use old ecar batteries at the recharge stations to quick charge ecar as fast as you want.  Those used ecar batteries are also connected to the grid and can make money as spinning reserve.  Yes, you might need a heavier charging cable, but 500 amps is handled all the time.  It only requires about  13 mm diameter wire.  Many houses have 500 amp service.  Industry AC feeds go  to MW's and kilo amps.   

 There are already batteries that charge in 15 minutes.  A123's entire line charges that fast.

 http://www.flinkenberg.fi/batteries/material/a123/APR18650M1%20Datasheet.pdf

Elizabeth M
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Re: Dose of reality, please
Elizabeth M   7/16/2014 7:17:40 AM
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I agree with you, tekochip. I actually wasn't necessarily thinking of this as an EV battery when I wrote the story, even if that is one suggested use for it. I think it could be good for mobile devices, which still take sometimes ages to charge when depleted.

Ratsky
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Re: Dose of reality, please
Ratsky   7/15/2014 1:27:48 PM
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I agree; however, far too many readers will see the reference to the EV application and think the major stumbling block to "universal" acceptance of EV is on the way to being solved.  It can't be.

tekochip
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Re: Dose of reality, please
tekochip   7/15/2014 1:23:50 PM
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True, it might not be an EV battery, but there are plenty of uses for a battery that can do an 8C charge reliably.


Ratsky
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Dose of reality, please
Ratsky   7/15/2014 1:14:12 PM
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Let's do some back of envelope analysis for the EV case.  Let's assume a modestly-sized battery of 25KWH capacity (less than 1/2 the Tesla S).  Assuming full recharge in 10 minutes, means the charger has to provide 150KW output (ignoring efficiency, or a partially-discharged battery).  With a nominal 300VDC battery, the charging current would need to be 500 amp.  As huge as the industry-standard charging plug is, I don't think it's rated to support that current.  The code requirements for the wire would be minimum 1000MCM; that has a minimum OD of 1.3 inches for a SINGLE conductor! Oh, that wire is not exactly flexible and weighs over 3 pounds per foot (again, each conductor) so good luck on trying to plug it in!

Of course, this is completely independent of the battery technology.  It applies to ANY type of supposedly "quick-chargeable"  EV battery.  I guess that "10 minute recharge" will ALWAYS be a pipe dream!  Even with a "wimpy" 10KW battery (like the Leaf) the numbers don't change very much.  Damned physics just keeps getting in the way of progress!

Elizabeth M
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Welcome technology
Elizabeth M   7/15/2014 6:55:32 AM
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I'm sure heavy mobile device users would really welcome this new type of battery so they don't have to wait to recharge and can recharge more quickly on the go. Of course, there are a lot of new battery chemistries being developed and it will take some time before some of them make it out of the lab and into the commercial sector. This one seems promising, though.

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