Re: [EVDL] Is considering using a Prius Pack worth it?
There are a couple of things that make a Prius battery less than acceptable as the only motive power supply for an EV. I worked with a start-up that was working on plug-in conversions, and the problems we noted were the lack of individual cell monitoring/management, and a low C rate.
Due to the lack of cell-level BMS, we had several cells fail, sometimes spectacularly, during charge. About the max power you can get out of a Prius cell is 100 amps, so you'll need to parallel 4 cells to get to minimal (Curtis) power levels.
Tom Keenan
[quote] Bruce EVangel Parmenter <xxx@xxx.xxx> wrote:
> With two posts going out each and every day, I am careful to try to post
> those two as the most likely all the readers will like better
> (subscribed and not), so I pursue how much a piece I posted is read. Our
> Sys Admin had helped me with using the proper weighting of those 'views'
> (you can not really go by what the count is). But the view count is a
> good guesstimate figure to eyeball reader-interest (summary: I try to
> give you likely want you want).
>
> I noticed there was a larger view count on
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Prius-Pack-Replacement-Co-t-td4656661.html
> EVLN: Prius Pack Replacement Co$t
>
> This lead me to have a couple of thoughts. One was for those that are
> having to replace a Prius pack. And the other was what other uses could
> a old/refurb Prius pack have.
>
> The former, led me to bring up
> http://www.mnn.com/green-tech/transportation/blogs/a-primer-on-replacing-the-prius-pack
> Which IMO broke most of what people will want to know:
> -if they are either not a DIY person or know nothing about Electricity,
> go ahead and hand your bank account over to your local profit making
> Toyota dealership
> _or_
> Dig into changing out the pack yourself and save a boat-load of $$$$
>
> The piece mentioned sourcing a refurb pack off ebay
> http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=prius+battery &_sacat=0
> But IMO unless I know the source is going to do the job of refurbishment
> to some acceptable spec (pack will have 80% capacity or better, life of
> refurb pack is good for about another 80k miles, pack comes delivered
> fully charged and balanced, etc.), you are taking a chance on what you
> are getting.
>
> The piece also had a good video on how straight forward a Prius pack
> swap out is
>
> [video
> http://youtube.com/watch?v=4ZygEiXw5uE
> Toyota Prius battery removal and repair. replace hybrid check engine
> light
> May 21, 2012 by drsjr1969
> 2006 Prius hybrid battery removal and installation. do it yourself info
> ]
>
>
> ...
> So, my other thought is what other uses could this Prius pack have?
> Before I went any further, I checked the archive, and found an
> interesting thread from 2010
> http://www.evdl.org/archive/index.html#nabble-td2991059
>
> But before I (and anyone else) thought, 'Hey maybe this is a cheap way
> to have an EV pack', I thought I would check some numbers first (I ask
> those with more experience weigh in and give their views/corrections).
>
> Looking at
> http://www.toyotapriusbattery.com/
> The Prius pack is only 6.5Ah @~200VDC or a 1.300kWh capacity.
>
> A quick view of EValbum gave an example EV
> http://evalbum.com/3058
> Batteries 45 Thunder Sky 2x60Ah, 3.20 Volt, Lithium-Ion
> System Voltage 144 Volts
> Range 60 Miles
>
> That EV has a 17.280kwh pack. That's 13.3 times more capacity than a
> Prius pack.
> At ~$800 a pop for an unknown quality refurb Prius pack, that would be
> $10,400 for 13 Prius packs, and you would need to charge each one
> separately, so add 13 chargers.
>
> _or_
>
> If you took 4 Prius packs apart, you could use them in a 72VDC nEV. That
> would be $3200+ to drop in 4 reworked Prius packs for the same nEV speed
> and range it originally had.
>
> It does not sound like trying to use a refurb Prius pack is worth the
> effort, when there are more affordable Li-ion packs that have a higher
> capacity.
>
>
>
> {brucedp.150m.com}
>
> --
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> or over the web
>
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