A long time has again passed since I made any progress in the project.
Life
came in the picture as we bought a flat, I'm finalizing my degree and
getting a second one, got a second dog, more responsibilities in the
office and so on... excuses are many.
Now there is something that I have dabbled with in my head and decided to do a post about it.
EV
and Racing batteries as in Lithium-Ion are quite interesting to me and
the next step forward from AGM or Lead acid technology and people are
using old laptop cells in making these kinds of batteries.
Traditional auto makers are also offering their solutions, but similar solution costs usually thousands of Euro (Porsche). This battery is going to cost me around 100 Euro, if all goes as planned.
I'm
planning to make a 80 Ah battery with maximum discharge current of 160
Amps continuous and 320 Amps peak. I know this is rather overkill, but
better safe than sorry!
So 4 cells in series and 30 of these in parallel. Nominal voltage will be 14.4 V.
There
are "better" cells that allow more current through them continuously,
but I have a free source for these cells so beggars can't be choosers
and 4C peak at start should not be so bad when the continuous is 2C.
This
gives me a safe and small battery (at least in weight), that has room
for expansion and capacity for a data logging system and in car PC.
Here are my calculations for the battery.
Even
though the capacity would be 80 Ah, the weight would be well below 10
kg when finished. Compare this to a traditional battery and the weight
difference is huge. We are talking about 20 kilograms.
I
could also divide this to a two units, where one pack (~60 Ah, 4s22p)
would be for starting the car and other high current electronics needed
at start and another pack (~20 Ah, 4s8p) would be for data systems and
ECU.
This battery project I can do in my
home so hopefully we will see some progress in this after I have all the
needed parts and can begin the assembly!
As always, all input is appreciated and welcome!
Edit: Wrong picture and now its fixed...
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