Date: Sun, 28 Jun 2009 18:16:56 -0700
Reply-To: Poppie Jagersand <poppie.jagersand@YAHOO.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Poppie Jagersand <poppie.jagersand@YAHOO.CA>
Subject: Re: New battery chemistries to watch for
Content-Type: text/plain; charset=iso-8859-1
The chemistry in these batteries are Lithium-Phosphate. Laptops, Cellphones and other electronics have Lithium-Polymer cells or similar.
Lithium-Polymer is an unstable chemistry, that is if you discharge them with a too high current they heat up beyond a point and an exothermic, self sustaining reaction will continue the heatup process, (even if the electric load is removed) until they explode in fire. This is what caused the spectacular laptop fires.
Lithium-Phosphate and Lithium-Manganese are two more modern and stable chemistries. The former is used in e.g. DeWalt powertools, and the latter in Bosch tools.
The 12V battery is made by the same manufacturer, Headway, which supplied the batteries to the 144V system for the electric motor VW Westy camper I posted about some months ago.
Martin
--- On Sun, 6/28/09, Roger Whittaker <rogerwhitt1@GMAIL.COM> wrote:
> From: Roger Whittaker <rogerwhitt1@GMAIL.COM>
> Subject: Re: New battery chemistries to watch for
> To: vanagon@GERRY.VANAGON.COM
> Received: Sunday, June 28, 2009, 2:02 PM
> Good Advice david
> thank you
>
> On Sun, Jun 28, 2009 at 10:06 AM, David Beierl <dbeierl@attglobal.net>wrote:
>
> > At 11:54 AM 6/28/2009, Poppie Jagersand wrote:
> >
> >> Now I'd wouldn't run out and buy one right away.
> While the cell
> >> technology is mature by now, there's electronics
> inside these
> >> batteries to control charging, discharging
> currents and maintain
> >> cell voltage balance. I'd like to see how this
> electronics hold up
> >> in automobile service first. But the promise for
> the future is
> >> great. A battery weighing 1/5 of the Lead Acid,
> lasting 10 times
> >> longer and not costing much more.
> >>
> >
> > But since lithium is an extremely active metal, always
> a potential
> > fire hazard, and an active one if the electronics
> don't do their job
> > correctly. And class D fires are hard to put
> out. This has already
> > become a real issue with cell-phone and laptop
> batteries using
> > lithium. I'd think it would be preferable to
> relocate such batteries
> > outside the passenger compartment...
> >
> >
> > --
> > David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
> > '89 Po' White Star "Scamp"
> >
>
>
>
> --
> roger w
> From Proverbs:
> Under three things the earth trembles, under four it cannot
> bear up: a
> servant who becomes king ...
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