If that is a photo from Ebay/Alibaba/etc....remember you may not get what you see.Torti said:Does anyone have experience with these cells
It's not even a photo--it's just a basic cgi 3d rendering.Hillhater said:If that is a photo from Ebay/Alibaba/etc....remember you may not get what you see.
Torti said:Does anyone have experience with these cells?
I want to build a 72 volt battery.
I want to build an enduro and ride it off-road.
I've also considered using 18650, but I don't know if they can take it.
In difficult terrain, I know there are cell holders, but I don't think they're good for a crash !?
amberwolf said:It's not even a photo--it's just a basic cgi 3d rendering.Hillhater said:If that is a photo from Ebay/Alibaba/etc....remember you may not get what you see.
@Torti; since you don't link to the actual cells, there's no way anyone (even Pajda) can know what those cells are or their specs (at least, what the vendor *says* their specs are)--it's just a guess, at best.
And since we don't know what kind of power demands your bike will have, we also can't know if the cells would be appropriate.
SInce we don't know how big a battery case or spot your bike has, *and* we don't know how big the cells are, we can't know if the cells will fit.
Etc.
You must provide us complete information for us to help you.
Pajda said:It seems to be VDA-PHEV2 prismatic format with: 27x147x91mm dimensions (91mm is height without the screw terminals). In this particular format you can get 50Ah
You need to clarify exactly what you “want”..Torti said:...I want to build a 72 volt battery....
.....I found a manufacturer in Germany that can supply a 72AH cell.
......I want to run 5000 watts with 200A power.
Why not link us to the cell so we can actually get the specs?Torti said:I found a manufacturer in Germany that can supply a 72AH cell.
Great stuff Pajda. Have you got any info on reliable makers of quality LFP in that form factor? I realize energy density will be lower.Pajda said:It seems to be VDA-PHEV2 prismatic format with: 27x147x91mm dimensions (91mm is height without the screw terminals). In this particular format you can get 50Ah (some producers claim 53Ah) as "high energy" cell (1C/1C at 100% DoD with >1000cycles life) and 37Ah (some producers claim 42Ah) as "high power" cell (2C/2C at 100% DoD with >1000cycles life).
The energy desity is ca 450Wh/l and 200Wh/kg for 50Ah HE cell. There are already many producers in China of this particular format and usually even nonames have good quality.
Pajda said:I am guesing that it is ETC-NCM72A cell, here you can find the datasheet https://www.lithiumstorage.eu/Joomla/index.php/en/produkte-lithium-storage/lithium-batterien-etc-series/ncm72ah.html
Torti said:Does anyone have experience with these cells?
Again, please link to the **specific** cells you are considering, especially those you think made in Germany.Torti said:I found a manufacturer in Germany that can supply a 72AH cell
Honk said:What's the actual sales price of this square puppy?
john61ct said:Great stuff Pajda. Have you got any info on reliable makers of quality LFP in that form factor? I realize energy density will be lower.
ExcellentPajda said:LFP 90Ah
https://www.aliexpress.com/item/4000805306784.html
OK.. i realise we are losing some detail with language and translation..where are you based ?Torti said:I want to build a 20S battery and need 20 cells, so I have 72 volts and 72 Ah.
john61ct said:ExcellentPajda said:LFP 90Ah
https://www.aliexpress.com/item/4000805306784.html
Varicore / Liitokala don't have the rep of say Winston, CALB, GBS or Sinopoly but
that's like half the price, plus free shipping ????
Pajda, do you still stand by this?Pajda said:By the way latest generation of big prismatic and pouch cells (already in mass production) is atacking 600Wh/l and 225Wh/kg energy density
john61ct said:Pajda, do you still stand by this?
"HP cells have significantly worse cycle life than most HE cells under low loads up to ca 1-2C continuous discharge. Generally(Although I do not like generalizations) HP cells cycle life is almost independent of the load. That means that HP cells should be used only in applications which really needs HP cells."
If so, what do you think of this scenario / question?
https://www.rcgroups.com/forums/showthread.php?p=44573093
Followed up here: https://www.rcgroups.com/forums/showthread.php?p=44582617
Those guys **hate** me bringing up cases under true 50-60C rates!
Sure but those are rarely good **value** IMO if you don't need to pay for the power capacity.Pajda said:But this does not deny that we can find cell with low DCIR and excellent service life.