Lithium Cell Terminology

[John Salani]

This message from "John Salani" <jrsal2@bellsouth.net> brought to you by EFLIGHT!

Just to get my brain calibrated - - a lithium pack of
3s4p means there are 4 parallel groups of 3 cells connected in series,
total of 12 cells - - is that correct??

John Salani
Flat Rock, NC


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[Doug Ingraham]

This message from Doug Ingraham <dpi@rapidnet.com> brought to you by EFLIGHT!

On Wed, 17 Sep 2003, John Salani wrote:

> Just to get my brain calibrated - - a lithium pack of
> 3s4p means there are 4 parallel groups of 3 cells connected in series,
> total of 12 cells - - is that correct??

This is correct. 3 times the voltage of a single cell and 4 times the
capacity of a single cell.

Doug Ingraham
Rapid City, SD USA




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[Brian Chan]

This message from Brian Chan <bhchan@mail.arc.nasa.gov> brought to you by EFLIGHT!

>This message from Doug Ingraham <dpi@rapidnet.com> brought to you by EFLIGHT!
>
>On Wed, 17 Sep 2003, John Salani wrote:
>
>> Just to get my brain calibrated - - a lithium pack of
>> 3s4p means there are 4 parallel groups of 3 cells connected in series,
>> total of 12 cells - - is that correct??
>
>This is correct. 3 times the voltage of a single cell and 4 times the
>capacity of a single cell.

And when you parallel the cells, most are not looking for capacity
but to increase the current supply limits.

If the cell can provide 5C (5 x the capacity) current drain, and you
need 25 amp max, you will need 5 of the 1000maH(1 AH) cells in
parallel.

Brian
--
Brian Chan,
An Electric Airplane Junkie @ San Mateo.Ca.USA

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