Re: Noob Battery Pack questions...

On Sun, 27 Jan 2008 10:10:13 -0500, "Tank 'm o'Niel"
<tanky@xxxxxxxxxxxx> wrote:

Hi - forgive me I'm a mechnical guy with limited electrical knowledge.: )

I noticed cell phone batteries have small circuit boards at the end of the
pack. What is the purpose of the board?

I am being tasked with a project using arrays of larger lithium cells - I
think there are 12 per pack. Each array comes with a circuit board at the
end as well. I noticed on the circuit board there looks to be a small
buzzer or something? Am I correct in seeing that?

I understand that lithium batteries can be extremely hazardous if
mistreated. That PC board is probably a charge controller/battery
monitor to prevent mistreatment.

If I wish to disassemble the packs to make larger arrays - could I have a
circuit board built to handle the larger array? Or is it more advantageous
to have a bunch of smaller arrays/packs than one large one?

Lastly, are battery packs assembled in series or parrallel and what is the
thining behind one over the other?

I respectfully suggest that if you have to ask this question, you
should not be considering re-configuring lithium battery packs.

Connecting batteries (or battery packs) in series increases the
available voltage, while connecting them in parallel increases
capacity, but leaves the voltage the same as for a single battery.


Any help appreciated -


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
.

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