4680--4695?

[eljimbo]

Has anybody built a battery using these new big lipos?

 

[neptronix]

Do you mean cylindrical cells?

I haven't seen a build with these yet.
These cells can be around 25AH. It's nice because you can build a giant 1P string of cells for an ebike pack.

Cell spacers do exist

 

[eljimbo]

It would seem to me that ultimately they should be cheaper to use. That I8650 is everywhere now because they fit in laptop computers. If car manufacturers create a big market for a larger cell and the price follows the market ... We can ride that wave. I'm waiting for some positive reviews of how they do in a bike. 60 little cells welded and taped together has always seemed kind of silly to me.

 

[neptronix]

I've also long been annoyed by the idea of stringing tons of little batteries together.
Harder assembly, harder disassembly, more cell testing needed to do matching, more nickel strips, more wires..

..and these days we don't need tons of tiny cells to optimize for battery pack density.. the tradeoff doesn't make sense anymore.

 

[syntony]

Has anybody built a battery using these new big lipos?

I wanted to use them in my new battery, but seems like they have aluminium connection on one pole so it wont be easy to spot weld for amateurs.

 

[eljimbo]

How do the pros deal with aluminum tabs?

 

[BatteryMooch]

How do the pros deal with aluminum tabs?

Laser or ultrasonic welding.

 

[Pajda]

How do the pros deal with aluminum tabs?

Laser or ultrasonic welding.

Or they simply avoid this particular 46xx format, which has been developed specifically for use in automotive industry and use instead a different format that respects other industrial applications (21700/18650 tabless) and thus allows for conventional CD spot-welding using Ni or Cu strips.

 

[BatteryMooch]

Or they simply avoid this particular 46xx format, which has been developed specifically for use in automotive industry and use instead a different format that respects other industrial applications (21700/18650 tabless) and thus allows for conventional CD spot-welding using Ni or Cu strips.

Ni-plated steel is our friend.