[ausev] Technical Considerations; Battery Pack Replac...

[michael]

So what we are saying here, is that even with an electric car, heat is
an issue to battery life as well.
 
>From personal experience those plastic shrouds don't help at all and are
more of a hinderance when trying to replace a battery in a gas car.
Never seen one in an electric car, but then again I have never seen an
electric car close up.
 
 
 
Michael Ringer
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-----Original Message-----
From: ausev-bounces at austinev.org [mailto:ausev-bounces at austinev.org] On
Behalf Of Charlesvsi at aol.com
Sent: Friday, August 11, 2006 12:54 PM
To: ausev at austinev.org
Subject: Re: [ausev] Technical Considerations; Battery Pack Replac...
 
On heat on batteries, we have an '04 Honda Civic Hybrid and the
maintenance manual shows, and I've looked at,  a blower fan that
circulates air around the battery pack under the rear seat, I think
sucking it in from a vent on the back window shelf. It is on a thermal
control and runs when needed as are the 2 front engine fans. 
 
There are 2 torsion bars on the car also, and it is very well controlled
in all situations so far. 
 
I could get some specs on fan size etc. if that would help. I'd assume
that the parts could be purchased from Honda. 
Chuck Simms, (contact info below.) 
 
In a message dated 8/10/2006 4:47:52 P.M. Central Standard Time,
jtp at onr.com writes:
Engine compartments can reach over 250 degrees at times.  Many batteries
have insulator blankets or plastic covers.  These extend the functional
life approximately 30 percent. 
The only heat factor which is relevant, then, is your rate of charge in
an EV.  The more heat (faster charge rate) the greater the reduction of
endlife.  Installing heat sensors or other devices which can monitor
heat values during charging may help greatly to study appropriate charge
rates for all of the various use, discharge, and battery state
conditions.  
 This might be more feasible as part of bench-test studies.
Carefully recording readings with an infrared thermometer taken of all
cells (bottom to top) during various recharge rate tests might be easier
and cheaper given all that has to be done to replace the pack.   I would
contact the battery manufacturer to ask about nominal rates and
temperatures.
Also,  what just occurred to me, if heat-up rates are closely comparable
to OEM (orig. equip. manuf.), then you may not need to be concerned
about extra cooling of some sort. Otherwise, it may be a good idea to
get recommendations from the battery manufacturer about possibly needing
some additional   active or passive cooling. 
Dan Petit.  
 

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