Thanks.

Overdischarge is a useful keyword via scholar.google.com.

On Thu, Dec 10, 2015 at 07:03:35PM +0200, embedded systems wrote:
> You have to dig for serious discharging tests below 2V.
> I didn't see any.  2V cell voltage seems to be the limit:
> http://ecec.mne.psu.edu/Pubs/2010-Zhang-JPS.pdf
>=20
> Vasile
>=20
> On Wed, Dec 9, 2015 at 11:34 AM, James Cameron <quozl@laptop.org> wrote:
>=20
> > G'day,
> >
> > What are the consequences of over-discharge of LiFePO4?
> >
> > We have a pack protection chip in our LiFePO4 packs, using either
> > Seiko S8232ATFT or a BM220 (origin unknown).  The chip drives FETs on
> > the low side of the pack.  The chip does over-charge, over-discharge
> > and over-current protection.
> >
> > The packs are two cells in series, 3.1 AH total.  The chip has a trace
> > to the common between the cells.
> >
> > If left in storage for long enough, self-discharge and discharge
> > through the pack protection chip (54 to 150 microamps) makes the
> > pack useless.  The pack will not accept a charge.  Cell voltages are
> > below 0.4V.
> >
> > A workshop fix is to penetrate the casing and briefly bypass the
> > protection chip to bring cell voltages back up to 2V or so, then the
> > chip will let current into the cells.
> >
> > Are there any consequences of over-discharge apart from capacity loss?
> >
> > Disclosure; this is an assigned task; I'm being paid for it.
> >
> > I can't ask the manufacturer easily, because they aren't making them
> > any more.  Our later models are LiPoly from another manufacturer.
> >
> > --
> > James Cameron
> > http://quozl.netrek.org/
> > --
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> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
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http://quozl.netrek.org/
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