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

On Fri, 14 Sep 2007 20:15:34 GMT, D from BC <myrealaddress@xxxxxxxxx> wrote:

On Fri, 14 Sep 2007 18:22:02 -0000, Michael <nleahcim@xxxxxxxxx>
wrote:

Hi - in the near future I will need to implement a circuit that
monitors and protects a lithium polymer battery pack that has about 12
cells in series in it. There are alot of special purpose chips
designed to protect lithium polymer battery packs consisting of 2-4
cells - but I've never seen anything for this many cells. Does anybody
know of such a beast?

If not - how best would I go about making this? Size is a huge factor,
cost is not nearly as much of one.

Thanks!

-Michael

I'm no expert on Lith batts..
But how about a temperature sensor on each battery.
12 thermistors + 12 comparators + 12 input OR gate + shut down
electronics. Bulky but dodges uC's.

(I hope I don't get too beat up on SED for that suggestion. :| )

you probably should ;-)

The protection modules guard against a number of conditions. Temperature can be
one, but is not always included. The most important functions of these modules
are undervoltage, overvoltage, excessive discharge current. Often excess charge
current sensing is also included.
.

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