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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: 48 Volt Rechargable Lithium Ion battery Pack?
Date: Fri, 27 Sep 2002 03:30:24 GMT
NNTP-Posting-Date: Thu, 26 Sep 2002 20:30:24 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
James Meyer wrote:
> I'm presently using three, 16 Volt, LiIon battery packs in series to get
> a 48 Volt power source. I'm doing that because 4-cell packs seem to be the
> maximum number of cells that are readily available "off-the-shelf". Also,
> charger chips seem to max out at 4 cells as well.
> The major problem is the complexity of having to have three chargers in
> the system. All the charger control chips I can find don't have isolated
> outputs and I need use a single charging supply. That means that I have to
> switch the packs from series when operating to a configuration with all the
> negative ends connected together for charging.
> Life would be much simplier if there were LiIon battery packs with
> twelve cells in series and charging devices to match.
> Has anyone seen any examples of commercial equipment using 48 Volt
> rechargable LiIon batteries? Since the TelCom industry is heavily into 48 Volt
> stuff, perhaps something there?
I had thought that the LiIon technology was not rechargeable.
And there should not be a problem with using *one* control chip; just
use a voltage divider on the sense side and maybe fudge in a pass
transistor or external switching FET (depending on topology) for the
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