LukeVader
Sun Farmer
Dongguan is where I got mine from cheaper cause of their shipping. I've been charging the cells @3.65v 7A with about 180 hours in them. They seem to be as advertised so far.
Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review
- Thread starter Steve_S
- Start date
gyrex
New Member
I've designed some cell spacers for these cells. They're designed to allow for buildings packs by locking the cells together and also providing a 10mm spacing between each cell to allow for ventilation. The only issue is that I don't have these cells yet so I've had to guess the dimensions. If someone can provide dimensions so I can complete the design, I'd really appreciate it.
Ideally I'd like the following measurements:
Ideally I'd like the following measurements:
- outer dimensions (I got the current dimensions off Alibaba but they may be incorrect)
- centres of the terminals in relation to the edges of the cell
- diameter of the raised terminals
D
Deleted member 4428
Guest
Your keyed design makes for a very flexible installation. It would be great if the ends were keyed too.
LukeVader
Sun Farmer
Same thread post #551 and #553 to name a few.
gyrex
New Member
Easy to add those, I'll do it tomorrow.
Sgt Raven
Solar Addict
- Joined
- Feb 17, 2020
- Messages
- 1,079
I would have at least 2 different files for the printer, probably 4. The outer edges don't need the dovetails and just add extra work and use extra material for the printer. You could draw out a pattern and then say you need so many of X1, X2, X3, and X4. It would depend on how many cells in the pack and which orientation you want them in. There is a limited number of variations for a 4, 8, or 16 cell pack, that make sense to use..
gyrex
New Member
If you click on the link provided there's different versions for the ends which don't have interlinks.
Sgt Raven
Solar Addict
- Joined
- Feb 17, 2020
- Messages
- 1,079
I've posted it so many times, I was going to let someone else....
173.6mm x 71.5mm x 204.8mm
Sgt Raven
Solar Addict
- Joined
- Feb 17, 2020
- Messages
- 1,079
Tell Amy that IMO, their packing of my cells was Grade A #1, as was the boxes they used.
Amy is writting up my order now. $1429 for 12pcs shipping to my door. Mentioned is forum and she is trowing in double buss bars and screws. So I get 840ah will still need a bms and other odds and ends for a bit more than 1 Battleborn. What a deal. The box in my 5th Wheel RV will fit all these very nicely.
Greg
Greg
If you flip the dovetails on one end would it help make it easier to turn batteries around when configuring in parallel or serial? Just a thought. Nice design.
These look nice but I don't think I can use them in the box I have. What are the length and wideth of these? My grandson has a 3d printer.
Greg
gyrex
New Member
I've updated the design to include dovetails/interlinks on all sides. I've done away with doing flat ends because it would mean too many variations of the design at this point. Can do this later if/when I get accurate dimensions.
I still really need accurate dimensions for the following:
- centres of the terminals in relation to the edges of the cell - need accurate dimensions here, there was an earlier post with rough dimensions which doesn't help when doing 3D designs.
- centre-to-centre dimensions of the terminals
- diameter of the raised terminals
STL's available on thingiverse here: https://www.thingiverse.com/thing:4307945
gyrex
New Member
Dimensions are above (based on dimensions provided by the Alibaba listing. By using these, they will allow a 10mm gap between each cell for ventilation. These cells should be ventilated for both performance and longevity, especially if you're planning on running large loads from them.
Sgt Raven
Solar Addict
- Joined
- Feb 17, 2020
- Messages
- 1,079
I gave the best I could do with the equipment I have. But even with my Mitutoyo 6" digital calipers set to mm. it's gonna be a rough estimate where exactly the center of the terminals is. I can guesstimate off the cross of the screws heads. But I won't promise it's an exact measurement. I can lay a straight edge against the side to get that part pretty close.
Sgt Raven
Solar Addict
- Joined
- Feb 17, 2020
- Messages
- 1,079
What are you considering a large load? 140A is still just 0.5 C load/charge. I can say pumping 35A into them didn't even make them feel warm.
gyrex
New Member
If the cells are packed next to one another, the aluminium will act as a heat sink and absorb all the thermal energy from all the adjoining cells. The more thermal energy one can dissipate through passive or active ventilation, the better for the battery. The battery will perform better and last longer at its nominal temperature range.
Since my project is based on 45 of these in 3x 15s3p packs in parallel which my inverters can draw up to ~600A total if I happen to lose the grid, I want to try and avoid as many potential thermal issues I can. Even in smaller load scenarios, removing thermal energy through passive dissipation would be advisable if you want to get the most out of these cells.
gyrex
New Member
Digital callipers will be perfect for getting dimensions - I can add a little wiggle room in my designs. Are you able to provide the dimensions I asked for? I did go back to the previous posts but I was struggling to understand some of the measurements and I think I need additional measurements such as the diameter of the terminals (and if they're the same diameter). These are the dimensions I need:
- centres of the terminals in relation to the edges of the cell - need accurate dimensions here, there was an earlier post with rough dimensions which doesn't help when doing 3D designs.
- centre-to-centre dimensions of the terminals
- diameter of the raised terminals (check to see if they're the same diameter)
Similar threads
