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Old 08-08-2012, 02:49 AM   #63 (permalink)
bwilson4web
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Join Date: Mar 2009
Location: Huntsville, AL
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17 i3-REx - '14 BMW i3-REx
Last 3: 45.67 mpg (US)

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This is well worth watching:
Quote:
Originally Posted by Daox View Post
The aluminum and aluminized copper tabs are simply extensions of the anode and cathode. You might find this video interesting...

http://ecomodder.com/forum/showthrea...deo-15502.html
Further in the video he goes over how LiON cells age and the breakdown voltage of the electrolyte, 4.3V. This means I can use my gang of Zeners and a stepped charge cycle, 5A steps down to 0.5-1A, when the 15 cells approach full charge 3.3V/cell and use the 3.6V Zeners safely. This has substantially simplified my in-bike charger.

One other thing, I'm not going to fold the tabs but use them also as heat-sinks. They provide an excellent transport from the body of the cells to where I'll run outside air to help dump the heat.

Of course, we'll still need to understand the temperature effects on voltage.

Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL

Last edited by bwilson4web; 08-08-2012 at 10:37 AM..
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