nuckolls.bob(at)aeroelect
Guest
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 Posted: Tue Mar 18, 2014 2:48 am Post subject: Lithium saga slogs ever onward . . . |
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I downloaded the detail spec sheet for A123 26650
cells at . . .
http://tinyurl.com/n73f9gj
This cell and others like it seem to be the core
ingredient of choice for many of the off-the-shelf
battery products that are cropping up everywhere.
There's an interesting graphic in this data sheet . . .
[img]cid:7.1.0.9.0.20140318053547.02132a48(at)aeroelectric.com.0[/img]
Notice that the family of curves acknowledges the fact that this cell,
like all other sources of energy, has a source impedance. This is
illustrated by the fact that heavier loads produce initial plots on
the curve that are successively lower in voltage as the load current
rises. I.e., the higher the load, the higher will be I(squared)R
energy losses due to internal heating.
But then something magic happens. All three plots come together
at just under 2.5aH . . . gee . . . where did all those wasted
Watt-seconds go during discharge but magically showed up again
before the cell dropped below 2V?
Can't believe much that you read in the papers . . . gotta
be careful about data sheets too . . .
Bob . . .
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