[Vo]:Re: Toshiba Bettery

[Michel Jullian]

Good point, I think you're right Stephen, but they probably want people to get 
it wrong, as I did too, because in fact they don't have a good _energy_ 
density, see my previous post in this thread and actual tech specs at the 
bottom of:

http://www.toshiba.co.jp/about/press/2007_12/pr1101.htm 

which is a pity as it seems quite good otherwise (lifetime 3000 cycles!)

Michel

----- Original Message ----- 
From: "Stephen A. Lawrence" <[EMAIL PROTECTED]>
To: <vortex-l@eskimo.com>
Sent: Wednesday, April 30, 2008 4:04 AM
Subject: Re: [Vo]:Toshiba Bettery


> Robin, I thought what you did when I first looked at their page -- but 
> then I stared at the page for a while and poked around on their site a 
> bit and it turned out what they were saying made sense after all.
> 
> Robin van Spaandonk wrote:
>> In reply to  Terry Blanton's message of Tue, 29 Apr 2008 13:25:12 -0400:
>> Hi,
>> [snip]
>>   
>>> The SCiB is finally in production:
>>>
>>> http://www3.toshiba.co.jp/sic/english/scib/index3.htm
>>>     
>>
>> "High power density even equal to that of a capacitor" 
>>
>> Unfortunately capacitors have lousy power density.
>>   
> Not exactly; capacitors have lousy ENERGY density.  Energy isn't power, 
> of course, but sloppy usage is so common we tend to expect it.  As it 
> turns out Toshiba has indeed kept the definitions of power and energy 
> straight, and they said exactly what they intended to say.
> 
> If you dig around on the site, you'll find that they use "Power density" 
> to mean how much power can be sourced as a function of the mass of 
> batteries in use.  On this page:
> 
> http://www3.toshiba.co.jp/sic/english/scib/detail.htm
> 
> they show a scatter plot with power density in W/kg on the Y axis and 
> energy density in Wh/kg on the X axis, and they put capacitors, their 
> new battery, NiMH, and Li batteries on the plot to show their 
> performance.  The illustration is here:
> 
> http://www3.toshiba.co.jp/sic/english/scib/image/feature3.gif
> 
> The plot makes it clear that what they're saying is that their /energy/ 
> density is that of a battery, but their /power/ density is comparable to 
> a large capacitor.
> 
> They don't give any numbers, though; it's just marketing slides.  But at 
> least the axes make sense.
> 
>> Regards,
>>
>> Robin van Spaandonk
>>
>> The shrub is a plant.
>>
>>
>>   
>