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lith ion batteries for prius? - Page 2

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Posted by Tomes on April 2, 2008, 1:53 am
 
"bob" ...

There is no need to replace the batteries.  They have not been failing in
any manner of significant numbers at all.
Tomes


Posted by e on April 2, 2008, 3:39 pm
 
Tomes wrote:

It's not because of failures... these are reliable
battery packs.

NiMH can be replaced by Lithium-based batteries of the
same weight to produce higher capacity and therefore
longer drive times. Fewer cells are required, as each
NiMH cell is 1.2V while each Li cell might be 3.7V
(depending on chemistry), with similar current density
(amps per unit weight).

One major issue is safety. With a laptop, temperatures
are reasonably controllable. In a car, however, the
temperature range can be extreme. Everyone working on
hybrid and electric cars is focused on this, and it IS
being solved.

I've been considering one of the lithium battery kits
for my '04 Prius, but it runs so well that it doesn't
make sense to experiment with it. Instead, I'll give it
to one of my kids when the HOV lane sticker runs out and
buy a lithium battery Prius (hopefully plug-in!) to
replace it.

Since much of the grid energy derives from coal, hydro,
and nuclear sources, plug-in is a great way to clip the
petro umbilical and stop writing checks to people who
hate us.

Ike

Posted by bob on April 3, 2008, 12:26 am
 

not to mention reduced greenhouse gases? :-)
main reason i'm asking about the lithium ions is that i had a job interview
a couple months ago with a company in S.C. who makes membranes for lithium
ion batts and that said they were going to be in priuses in 2010 - 2011 -
was curious if they were blowing smoke, which i believe they were......

bob


Posted by Bob & Holly Wilson on April 3, 2008, 1:16 am
 

There is no way to know.


No. The battery chemistries are different as are their operational
characteristics. You really need to have an integrated battery
controller that knows job 1 is to protect the batteries.

Do the following experiment, replace some of your NiCD or NiMH battery
powered equipment with LiON and tell us how well it works out. You can
buy them at Radio Shack.

Use something that is easy to replace. For example, a flashlight.

Bob Wilson

Posted by Chas Gill on April 3, 2008, 10:28 pm
 

So, give us a clue - what will happen?

By the by, I believe the Prius has a battery controller that does, indeed,
put the health of the battery first.  No doubt, however, that it won't work
for LiON cells.

I also believe that plug-in to charge Prius after market 3rd party upgrades
are available (at a huge cost and doubling the current space taken by the
factory spec. battery) which give considerably greater range.  OK if you
don't need the trunk space, I guess........

Chas



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