Hey Bill, Do you think that the stall seen in NiMH technology has anything to do with the shelving of the production of batteries that occurred after the patent was bought up (and the interest in said technology now that the patent has expired)? On Sep 9, 2014 1:40 PM, "Bill Dube via EV" <ev@lists.evdl.org> wrote:
> NiMH has been largely eclipsed by Li-Ion. > Li-Ion has quite a bit more specific energy and specific power. > They each have their specific issues, but in the end, the specific power > (and price) is what we are all after. > > Can you even find a new NiMH cordless tool anymore? All the new cordless > tools have gone to Li-Ion. > > Folks have been trying for a bi-polar battery for quite some time. The > costs remain quite high for the gains in capacity. Nilar says it best > "Bipolar design has historically been the Holy Grail of battery technology, > but has historically been difficult to realize." > http://www.nilar.com/technology/ > > The edge seals are always the difficult part. Still is. > > Bill D. > > > At 01:26 PM 9/9/2014, you wrote: > >> On 9 Sep 2014 at 3:20, brucedp5 via EV wrote: >> >> > The Concept J is supposed to be powered by the Kawasaki's proprietary >> > GIGACELL® ... nickel-metal hydride battery composed of individual cells >> > that are connected in series at their cell walls, with the front and >> > rear surfaces becoming the positive and negative terminals, forming a >> > bipolar structure. >> >> Interesting that they might use NiMH. This battery tech has largely been >> forgotten in the rush to lithium. However, it's proven very reliable in >> the >> old first generation Toyota RAV4-EVs. Many of them have gone well over >> 100,000 miles on the original battery. >> >> The problem has been the obstinate refusal of the NiMH patent holder >> Cobasys >> (originally Ovonics) to license BEV-size modules (anything over 10ah). >> Perhaps the Kawasaki design evades the Ovonics patents by virtue of their >> very different design. Or perhaps BASF, who IIRC now owns those patents, >> is >> less restrictive. >> >> Anyone know what might be going on here? I'd love to see NiMH as a viable >> and affordable EV alternative to lithium. OTOH the word "proprietary" is >> generally not a good sign in this context. >> >> PS - is what they describe here a true bipolar battery? I'm not so >> sure. I >> had the impression that in a bipolar battery the negative electrode of one >> cell and the positive electrode of the next one in series were THE SAME >> PIECE OF MATERIAL, not just two electrodes butted or welded together. >> Heck, >> if butted electrodes defined a bipolar battery, then the battery in my >> flashlight is bipolar, no? >> >> David Roden - Akron, Ohio, USA >> EVDL Administrator >> > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/ > group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140909/598bdaa7/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
