Re: ECD and Matsushita -- Answers to All Your Questions, Bruce! (Long)

["David Roden (Akron OH USA)" <roden@ald.net>]

On 27 Feb 2002 at 4:25, Dave Goldstein wrote:

> The NiMH 
> numbers of >90 Wh/kg (measured at a USABC 
> standard C/3 discharge rate) *are* accurate for the 
> Ovonic GMO-3 EV batteries, according to DOE and 
> USABC data that I have available.

Those numbers, if applicable to mass-production modules, are quite good.  
I'm pretty sure I've read that in the past sample variability has been 
quite high, enough that it was necessary to hand-select modules for 
critical applications.  That would obviously play hob with costs.  I 
wonder how the Matsushita product's consistency compares -- and for that 
matter the Gold Peak's.

As for the nicad specific energy, it may be that Ovonic's writers  
considered it for steel-jacketed nicads, which tend to be pretty heavy.  
That seems uncharacteristic though -- after all they gave lead credit for 
the high end of its SE, at 36 wh/kg.

While lead, nicad, and NiMH all have important roles to play in short-
term EV development, I hope to soon see a practical lithium polymer 
battery for EV use.  Because of the flexibility in shape, I think LiPoly 
has great potential.


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David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1970 GE Elec-trak E15 36vdc
1974 Avco New Idea rider 36vdc
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