Dumb question for building a 20s battery

[Ziip0]

Hi, I got a very little experience with EV. Especially for building batteries. I only build a 20s EIG cells pack 20Ah (pouches)

I would like to build an other pack, more powerful, more capacity, and simple to do. For example I wonder if I just can buy 20x 4695 tesla cells like this TESLA 4695 Batterie lithium-ion rechargeable 46950 30ah NCM 3.7v 300000mah Batterie solaire rechargeable
to have a 72v 30Ah 300A max discharge pack?
Instead of buying a lot of 21700 cells?

It's almost like a Molicel P45B 20s7p

 

[neptronix]

How about 32ah 4680?
INR4680-bakpower

200whrs/kg and 10C rated, not bad.

Realistically you just need the right cell holders.. and a whole lot of space..

 

[Ziip0]

Yes they are even better, do you know if it's possible to buy them? Or they are not released yet?
I got space for 20, cell holders with 3D print, the tricky part is the busbars... I think that soldering 5AWG between each cell is not a good solution
Any idea?

 

[neptronix]

Sorry, i'm not a battery builder.
Found out about the cell from here:

Tabless design cylindrical cells tests

 

[Ziip0]

Ok np thanks, I also saw that topic, incredible work.

Sorry for this kid scheme made in 30sec, but I thought about that solution, with good holders maybe it could be good. But bms wires are an other story.

 

[BlueSwordM]

Hi, I got a very little experience with EV. Especially for building batteries. I only build a 20s EIG cells pack 20Ah (pouches)

I would like to build an other pack, more powerful, more capacity, and simple to do. For example I wonder if I just can buy 20x 4695 tesla cells like this TESLA 4695 Batterie lithium-ion rechargeable 46950 30ah NCM 3.7v 300000mah Batterie solaire rechargeable
to have a 72v 30Ah 300A max discharge pack?
Instead of buying a lot of 21700 cells?

It's almost like a Molicel P45B 20s7p

Oh, that is actually a great idea.

The main problem is that shipping is going to cost you a pretty penny if you only order 20 cells.
To make it worth it, you'd be better off buying many of them (at least 100) to lower the shipping costs.

Also, be careful. It's possible that any of these cells use aluminium casings to boost their gravimetric energy density (Wh/kg), which makes welding to them harder.

Now, if you can spotweld aluminium, that means you can also use aluminium busbars and make a kickass super capable inexpensive battery pack using these large format cylindrical cells

 

[AdR]

try batteryhookup.com

 

[Ziip0]

Yes, shipping costs will be expensive + VAT... first I need to ask for a quote to know.
ATM I'm only able to screw M3 bolts for EIG cells busbars (C020 / 20Ah / 100A continuous 200A peak), 10 years ago those cells were the best of the best.
But regarding of my new cells choice, I need to see for the best option. Spot welder I think that is the easiest way. Thanks for your comment, if this is aluminium case it will be too complicated for me for welding. I'm going to ask to the reseller.

I dont find those cells on batteryhookup.com