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eetcowie
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book
eetcowie   7/18/2014 10:03:05 AM
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Glad to see there is such interest in this topic. I am considering doing it, especially since I'm wanting to publish the work I did creating spice models that functioned for selected chemistries.

I should put myself down for one also, I think.

Thank you all for the encouragement.

Garcia-Lasheras
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Chemistry
Garcia-Lasheras   7/18/2014 7:02:48 AM
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@eetcowie: I'm really enjoying this blog series! We use to forget that Electric/Electronic Engineering is not only about Physics, but also it's closely related with Chemistry.

I agree with Antedeluvian in that you should consider writting a book. In any case, I'm already keeping a printed compilation of your battery technology blogs for future quick reference ;-)

antedeluvian
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A book
antedeluvian   7/17/2014 1:30:18 PM
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Ivan

I still think there is a book in your future! Seriously, when you complete this series, use it a basis. Put me down for one.

eetcowie
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Re: Where does the heat come from?
eetcowie   7/16/2014 10:07:45 AM
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Some applications that aren't naturally hot have a heater to get it started, and then are such high drain that the losses keep it hot enough (with thermal insulation). Other applications are already in a hot enough environment, such as in a spaceborne deployment for example, where the sun keeps it going.

Yes, heaters makes it inefficient -- but you can amortize the loss by not thermal cycling (re-starting) as much as possible, and by making the thermal insulation very effective for cases where self-heating doesn't work by itself.

In applications where the battery goes cold, the design is such that the restart to operating temperatures works, with some lifecycle/servicelife penalty.

Interesting questions.

David Ashton
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Where does the heat come from?
David Ashton   7/16/2014 6:24:13 AM
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Hi Ivan, another great article, thanks.

How are the high temperatures for this type of battery maintained?  Do they have to have heaters to keep the sodium molten?  And if so, does that not make it very inefficient?  If the cell is allowed to cool so that the sodium and/or sulfur solidify, is that the end of it or can it be restarted? 



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