PPRuNe Forums - View Single Post - 787 Batteries and Chargers - Part 1
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Old 26th Feb 2013, 10:54
  #815 (permalink)  
cockney steve
 
Join Date: Jan 2008
Location: lancs.UK
Age: 72
Posts: 1,196
@ Murphy...I was trying to make the point that, even doing it on the cheap with discrete components and maximum redundancy, it wouldn't exactly be overwhelmingly complex. Every single sub-cell could be monitored and contained thus giving a hugely enhanced safety-cushion.


@flightpathOBN I still think that GS-Yuasa's construction is beyond reproach....yes, I take on board the issue of folds, expansion and contraction.

WOUND CONSTRUCTION WILL NOT STOP THAT THERMAL MOVEMENT
It is arguable that, given the binding -effect of the spiral-wrap, the crushing-pressure in the core will be far higher than in the flat-folded construction. Not to mention the heat buildup in the core....this could be mitigated by using very tall electrodes with fewer turns...then you're on to 24 long-slim, cigar-shaped cells wired in series-parallell.
Ever wound a ball of wool or string over your fingers? coiled rope round hand and elbow? Gets tight, doesn't it!
the batteries in service(and changed) have been abused!
other discussion in R&N, but not of the quality of this one
cockney steve is offline