Questions to Thunder-Sky?

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Johnny J
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Questions to Thunder-Sky?

I will visit the TS Ningbo factory at the end of March.
If you have any questions regarding their batteries, I am willing to forward them.

Please fill in below:

*How is the performance affected by low temperatures?
*Will you produce any low cost BMS-systems for the smaller cells?
*

wheelie
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Re: Questions to Thunder-Sky?

I have just bought some Thundersky LFPF cells - and I want to lay them on their side - to fit them into my custom trike... The recomendation is to use them "standing up" - I want to know what detremental effect laying them on their side has??

evpower.com.au has low cost BMS units for these "small" (40AH - 90AH) batteries.... specifically made for the Thunderskys'.

colin9876
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Gimee Gimee!

I want some. How much and where did u buy them from.
Also how big are they? Are they similar to D cells?

antiscab
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Re: Gimee Gimee!

Hi guys,

re putting cells on their side, this is what weve dug up:
http://www.aeva.asn.au/forums/forum_posts.asp?TID=867

thundersky cells are large prismatic type cells with bolt down terminals.
the 40AH cells are 1.5kg and the 90AH cells are 3kg

Matt

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km

colin9876
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Re: Gimee Gimee!

ok whats the term prismatic actually mean? I imagined triangularish like a prism but in the pics they look like rectangular 'bricks'?
What I want to get my hands on is the D cell type batts in the Dewalt Nano's. Theres got to be a cheaper way than buying and breaking Dewalt packs?

garygid
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Re: Questions to Thunder-Sky?

Question:
Is it possible for the slow "pulse charging" from a TS charger (2 amps for 2 minutes, then 20 minutes "rest", the "pulse" equivalent of an average 0.2 amps "trickle"), if left "ON" for days, eventually overcharge (and damage) a high cell (for example a TS LiFePO4 40 or 60 Ah cell) in an unbalanced pack?

Cheers, Gary
XM-5000Li, wired for cell voltage measuring and logging.

antiscab
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Re: Gimee Gimee!

gday colin,

yes they are shaped like bricks.
the cells in the dewalt packs are A123 and are very powerful (which is why they are very expensive)
you could go for LifeBatt batteries, which come pre-assembled into battery packs with BMS and charger (these are cheaper but only 1/4 the power density, with the same energy density)
LifeBatt uses PSI cells, if you would prefer to build your own pack.
Headway cells are fairly good, but these are an 1/8th the power density of the A123 cells (but the same energy density)

for scooters, thundersky is more than powerful enough.
my 40AH 60V pack will put out 6kw
the 60AH 72v packs in the maxi scooters are good for 12kw

id suggest only going for the more powerful cells if you are building a motorbike.

dunno about the overcharge issue....id be interested to hear the answer to that one aswell

Id suggest also asking it on the thundersky yahoo group

Matt

Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km

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