Re: (ET) Pack is unhappy, weird!

["David Roden" <etpost drmm net>]

Back in the day, when some road EV hobbyists used series-parallel battery 
arrangements with 12 volt modules, often AGM lead, they usually "buddy-
paired" the batteries.  

That is, instead of creating 2 nominal-voltage (say 144 volts) series 
strings and paralleling the strings for more amp-hour capacity and 
current, 
they connected pairs of 12 volt modules in parallel, then connected all 
the 
pairs in seriees to reach the required voltage.

(View with monospaced font:)

This:

B   B   B   B
|---|---|---|
B   B   B   B

and not this:

B---B---B---B
|           |
B---B---B---B   

It's been a while since I've torn into a laptop battery, but I'm pretty 
sure that I recall that they also use this method.

IIRC, some EV hobbyists added fuses to the parallel connections.


David Roden - 25 Years with ETs

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