Just for those who think lithium burns - some do BUT
Lithium Iron Phosphate does not burn when shorted. That is why it is being used in all the new gen hybrids and the Volt.
Nickel Metal Hydride can be very good the Prius packs seem to loose about 4% capacity over 6 years - a tribute to the management and cooling system they use. NiMh can explode, the consequences can be interesting and are always untimely, more so if the user is oblivious to the conditions under which that may happen happens.
Andrew
There are those of us who rather like lithium. I have had a 16 cell 160 ah bank for over a year with very fine performance. I have a bms but the charger and a total battery monitor, i.e., fuel gauge, have managed the bank to the point that neither the bms alarm nor shut-down have ever gone on. I am operating with a 0.5C load. There is no need for a blanket condemnation when they may be the best solution for some applications. My app is to go fairly fast (10-15 knots) for a long way (25+ nm). It works.
NedP.S. Love is giving of oneself for the good of the beloved. It can last forever.
On Jun 12, 2012, at 11:49 AM, Kirk McLoren wrote:
the patents control all batteries regardless of the application.Lithium is a PITA. each battery requires a BMS.Love is so short, forgetting is so long.
From: danbollinger <no_reply@yahoogroups.com>
To: electricboa! ts@yahoogroups.com
Sent: Tuesday, June 12, 2012 5:14 AM
Subject: [Electric Boats] Re: NiMH Batteries Suppressed
Right. I got that reversed. The patents control all-electric vehicles, but not hybrids. Sadly, NiMH are much more easily recycled than Lithium-ion.
--- In electricboats@yahoogroups.com, Craig Carmichael <craig@...> wrote:
>
> >I believe there is some sort of contract, patent, or combination of
> >both, possibly from GM, that requires hybrids to only use NiMH.
> >
>
> It is the opposite. Since the success of GM's EV-1 [see video "Who
> Killed the Electric Car"] Chevron acquired Ovonics from GM, and via
> its morphing proxies Cobasys and now "Ovonics reborn"(?) has acquired
> 125 patents for metal hydrides and simply won't let ANYBODY, ANYWHERE
> build big flooded NiMH batteries.
>
> The writing is on the wall: try to make them and you'll get a "stop
> work" injunction and be tied up in court until bankruptcy. Whether or
> not any of the patents were violated. No sane investor would touch
> that. (And I'll bet almost none of the 125 inventors got much of
> anything, since their inventions have gone to waste as usual.) No
> wonder China "doesn't honor" [technology murder by] US patents.
>
> That's the main reason lead-acid isn't EXTINCT, because as Kirk
> surmises the prices would be economical - only somewhat more, and the
> batteries far superior and way longer lasting.
>
> That's also why the NiMH D cells have been so well developed and have
> amazing specs, and are being used as hybrid batteries. But they cost
> double(?) what big flooded cells would.
>
> And it's also the main reason there are big lithium batteries. These
> snuck past while they were busy supressing NiMH because they were so
> high priced and so 'touchy' in operation that the gangster owners of
> "big oil" thought no one would use them.
>
> And it was my original impetus to try, first 'simply' to make NiMH's
> (Jan.2008), and then as I learned more, to create a new higher energy
> economical battery chemistry.
>
> Craig
>
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