Re: li-poly battery protection for high cell count packs

On Sep 16, 2:04 am, budgie <m...@xxxxxxxxxxx> wrote:
On Sat, 15 Sep 2007 15:54:10 GMT, Gary Tait <classic...@xxxxxxxxx> wrote:

(snip)

If the packs are externally charged, it could be rigged to charge in
series paralell, and discharge in series.

in which case a readily available 4-cell chip would provide the basis for the
monitoring side of protection.

One complication is the readily available protection modules normally interpose
a series "switch" as their method of protection/intervention. For S/P charging
that would be fine, but for series discharge you would (probably) wind up with
N/4 series switches, all of which present a finite impedance, and which is sort
of suboptimal. Generally these switches can't be isolated from their driver
which ties them back to their group of cells, and the drivers can't readily
interface with a common switch.

How readily available are these chips? I had thought that I had seen
them before - but now I'm going through all the usual suspect's
websites and I'm turning up essentially nothing. The only chip I've
found that looked reasonable was the MAX1666: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2022
- but that part appears to hold true to the Maxim standard - it's not
available - anywhere.

-Michael

.

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