It's a perfect packing of cells into the smallest space. Running the
bands up the ends of the cells seems to make sense. However, in this
application, they have relatively low current and small wires.
To take this to a traction pack, I would want to try a similar design
where strings of cells are spot welded in parallel for the desired
current load. As I understand it, you can put as many in parallel as
you want and control them with a single BMS unit. Heavier straps could
be used and extended above the top cell. These extensions then become
tabs which can be partially bent over and bolted together (making an
upside-down Y) in a zig-zag fashion. By putting enough modules
together, you achieve your pack voltage. And modules can be unbolted
and swapped out if necessary.
Disclaimer: I've never done this !
Peri
------ Original Message ------
From: "Michael Ross via EV" <[email protected]>
To: "Cor van de Water" <[email protected]>; "Electric Vehicle
Discussion List" <[email protected]>
Sent: 19-Aug-14 1:10:59 PM
Subject: Re: [EVDL] CALB bolt terminals getting hot -
This is not a walled garden - or at least it was not in the past.
Anyone
should be able to see it. I think perhaps the long URL got truncated.
http://snipurl.com/296ptf3
http://snipurl.com/296ptn1
This should be viewable by anyone
https://sites.google.com/site/michaeleross/misc
On Tue, Aug 19, 2014 at 3:57 PM, Michael Ross
<[email protected]>
wrote:
Sorry about the picture. I don't have another file service. I will
put
the image on my webpage if it still works.
Cor has it right. It is 16 "cells" making a 48V pack of LFP. The
cells
are each a group of parallel cells. Sold as a 20Ah pack (who know
how
accurate that is) and it does indeed put out about 1kWh. The groups
have a
strip of stainless (my presumption) with 4 tiny spot welds on
between the
strip and each individual cell. The 16 cells are connected in
series with
shorter strips also spot welded in place.
It is clear that with the right combination of voltage and current
that
you can weld them together without starting a fire. What that
combination
is, I can say, but it won;'t be a very powerful setup and there is
no real
reason why it has to be expensive.
I guess no one has tried this, yet? It seems pretty effective from
an end
user POV.
On Tue, Aug 19, 2014 at 3:34 PM, Cor van de Water via EV <
[email protected]> wrote:
The pic shows a staggered set of 6p8s cells with Nickel? weldeedd
strips
on the column of parallel cells.
It appears that there are 2 of these sets total in the pack (a
white
separator can be seen between the two layers) so apparently it is
total
16 series, which would make it a pack of 51V or 60V depending on
the
cell technology. If the cells are 3Ah then it would be an 18Ah
pack of
about 1kWh
Cor van de Water
Chief Scientist
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.info
Skype: cor_van_de_water Tel: +1 408 383 7626
-----Original Message-----
From: EV [mailto:[email protected]] On Behalf Of EVDL
Administrator via EV
Sent: Tuesday, August 19, 2014 11:58 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] CALB bolt terminals getting hot -
On 19 Aug 2014 at 12:20, Michael Ross via EV wrote:
> Has anyone tried assembling a pack like:
>
https://plus.google.com/photos?pid=5943603287809906194&oid=1007672764609
53028406
Don't know. Can't see it. :-(
Folks, if you want the EVDL membership to see your pictures,
please
don't
post them where we have to log in to see them.
There are many websites where you can post pictures that don't
require
the
viewer to log in. There are even some where you can post without
logging
yourself. Using exclusive "walled gardens" like Google Plus and
Facebook
isn't much better than taping up pictures on the bulletin board in
an
apartment complex laundry room. Only people who already know you
well
(online) can see them.
Please see point 5 in the list conventions :
http://www.evdl.org/help/index.html#conv
Suggestions :
http://en.wikipedia.org/wiki/Comparison_of_file_hosting_services
http://en.wikipedia.org/wiki/List_of_photo_sharing_websites
Thanks.
David Roden - Akron, Ohio, USA
EVDL Administrator
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Put this question to yourself: should I use everyone else to attain
happiness, or should I help others gain happiness?
*Dalai Lama *
Tell me what it is you plan to do
With your one wild and precious life?
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To invent, you need a good imagination and a pile of junk.
Thomas A. Edison
<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html>
A public-opinion poll is no substitute for thought.
*Warren Buffet*
Michael E. Ross
(919) 550-2430 Land
(919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google
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Put this question to yourself: should I use everyone else to attain
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Dalai Lama
Tell me what it is you plan to do
With your one wild and precious life?
Mary Oliver, "The summer day."
To invent, you need a good imagination and a pile of junk.
Thomas A. Edison
A public-opinion poll is no substitute for thought.
Warren Buffet
Michael E. Ross
(919) 550-2430 Land
(919) 576-0824 Google Phone
(919) 631-1451 Cell
(919) 513-0418 Desk
[email protected]
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