26650 94v build questions!

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speedy1984   1 W

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26650 94v build questions!

Post by speedy1984 » Mar 15 2019 2:27pm

Ok so the time has come to start welding my 26650 cells together. Now after some research I found that the pure nickel strips I will be using will take 45a per strip between each cell. As I'm after as much amps as possible from this build (22s 20.000mah 26650)These cells are rated at 50a burst so 200a burst is what I should get ish!So with that in mind should I layer my strips four times between each cell plus between +&- for current sharing. Looked at a few pack builds now but as this is my first build from scratch I thought I would ask👍

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amberwolf   100 GW

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Re: 26650 94v build questions!

Post by amberwolf » Mar 16 2019 3:43am

20Ah in a 26650 cell? You might want to check that.

Might also want to verify they'll do that 50A peak current, too, and for how long before they get hot, when embedded in a pack, (so you'll know they'll actually do what you want without damage).

Karl USA   1 µW

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Re: 26650 94v build questions!

Post by Karl USA » Mar 17 2019 9:17pm

Hi, I'm new to this forum, and Li-ion cells and chemistries are one of my interests. Not sure the mfr of your 26650 cells, but A123 has a 26650 cell that has a max continuous discharge current of 50A and can peak/pulse for up to 10-sec. at 120A. It's an LFP, so cell voltage is 2.3V nom. Multiple spot welding on each tab will minimize hot spots.

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Re: 26650 94v build questions!

Post by Karl USA » Mar 17 2019 9:19pm

Correction, LFP is 3.3V, this 26650 cell has a nom. capacity of 2.3Ah.

Hillhater   100 GW

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Re: 26650 94v build questions!

Post by Hillhater » Mar 17 2019 10:33pm

amberwolf wrote:
Mar 16 2019 3:43am
20Ah in a 26650 cell? You might want to check that.
).
I think we all know that is impossible.. :bigthumb:
But we may be missinterpreting the description..
Reading between the lines, the OP may mean the 22s pack is 20,000mah total.?
And at 200a burst from the pack using 50a burst individual cells,...that would suggest a 4p arrangement od 5,000 mah cells . :?:
There are several 5000ah , 26650 LiCo INR cells that have those specs.
It would be good if the OP can clarify exactly what cells he has.

But , in reply to the original question, ..yes double up on those strips , or find a better method for the bus bar interconnects. 200a is beyond most nickel strip methods.
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speedy1984   1 W

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Re: 26650 94v build questions!

Post by speedy1984 » Mar 22 2019 9:20am

https://www.instagram.com/p/Bu90_thHA7K ... 02mvzvyx9e

Hi ,these are the cells in question guys. Sorry for not explaining myself a little more clear. Also thanks for reply

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amberwolf   100 GW

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Re: 26650 94v build questions!

Post by amberwolf » Mar 22 2019 10:12pm

The link just gives me a blank page. What is it supposed to show? Is it the manufacturer or seller site with specifications? Or is it just an image?

If the latter, then you should attach the image directly to the post in the attachments tab, so that anyone that can see the post can see the image.

If the former, perhaps you can copy the text information and paste it into a post.


If it's something else than those two, you'll have to explain what it is supposed to show.

Hillhater   100 GW

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Re: 26650 94v build questions!

Post by Hillhater » Mar 23 2019 2:20am

AW, its an instagram photo of a bunch of boxes, marked 'Llitokala 26650"
So i guess they are this cell...
https://lygte-info.dk/review/batteries2 ... %20UK.html
OP ,..please confirm .
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speedy1984   1 W

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Re: 26650 94v build questions!

Post by speedy1984 » Mar 23 2019 1:17pm

Hillhater wrote:
Mar 23 2019 2:20am
AW, its an instagram photo of a bunch of boxes, marked 'Llitokala 26650"
So i guess they are this cell...
https://lygte-info.dk/review/batteries2 ... %20UK.html
OP ,..please confirm .

Hi, yes these are the correct cells I was talking about.

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Re: 26650 94v build questions!

Post by amberwolf » Mar 23 2019 11:40pm

According to a google search, a number of sites show they are only 5Ah cells, not 20Ah.

They also say they are 50A (assuming short bursts), so I wouldn't try to pull 200A from one.

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Re: 26650 94v build questions!

Post by Hillhater » Mar 23 2019 11:48pm

AW.....
Hillhater wrote:
Mar 17 2019 10:33pm
.......
Reading between the lines, the OP may mean the 22s pack is 20,000mah total.?
And at 200a burst from the pack using 50a burst individual cells,...that would suggest a 4p arrangement od 5,000 mah cells . :?:
This forum owes its existence to Justin of ebikes.ca

speedy1984   1 W

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Re: 26650 94v build questions!

Post by speedy1984 » Mar 24 2019 5:47am

amberwolf wrote:
Mar 23 2019 11:40pm
According to a google search, a number of sites show they are only 5Ah cells, not 20Ah.

They also say they are 50A (assuming short bursts), so I wouldn't try to pull 200A from one.
200a from one cell :lol:

speedy1984   1 W

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Re: 26650 94v build questions!

Post by speedy1984 » Apr 14 2019 6:54pm

https://www.instagram.com/p/BwQULrIHZif ... v7qi4cwbdw
Ended up going over every connection three times and used .2 pure nickel strips.Hoping that should handle some short high amp burst👍

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