non typical cell orientation

[Ext194]

pros and cons of cell orientation other than personal confusion and aesthetics
I'm very limited on space and I'm trying to utilize area along the wall in my utility room I was try to find something online to help facilitate a design other than the normal I have uploaded some pictures of area I have been Tring to work with
my intention is to arrange cells in a "L" configuration on a shelf was try to show my thoughts on layout with playing around with thinkercad

 

[Backyard]

What's your plan for compression?

 

[Ext194]

What's your plan for compression?

None it seems as if some say you must and some say not necessary
Was thinking with low "c" rate this may be less critical
3000 watt inverter on 280amh battery
But still trying to do some research

 

[Ext194]

Was considering using 3m strapping tape or plastic banding if necessary

 

[SparkyJJO]

I see no problem.

I don't think spring-loaded compression is at all necessary because I have yet to see any professionally built battery pack for an EV or anything else use that sort of thing. They're all just rigid boxes, basically, so that's what I've done, they're in a box that just fits the cells (with insulating foam so no short circuit risks), and my adjustable plate is snugged up. If it is good enough for an EV it is good enough for me!

An L shape is a bit more complicated as far as a restraining box goes, but can be done without that much fuss, if you want. I know some people just set the cells next to each other and not worry about it. Personally I'd at least stick some end plates to hold them in place so they don't move around (reduced strain on the terminals after all), but that wouldn't be hard to do. If you use metal plates then be sure to insulate them well.

DISCLAIMER: I am no battery expert, just a DIY idiot

 

[Backyard]

Was considering using 3m strapping tape or plastic banding if necessary

My CATL packs use metal banding not unlike the banding used in shipping crates or pallets. Not really tight either. But it is epoxied down to a metal base at the bottom so that probably does the most in keeping them together

 

[Ext194]

My CATL packs use metal banding not unlike the banding used in shipping crates or pallets. Not really tight either. But it is epoxied down to a metal base at the bottom so that probably does the most in keeping them together

yeah still reading up on it but seems most prebuilt use some sort of compression I do see some have not and some have good results between "off grid garage " and Will Prowse youtube it seems it could be safe to assume no compression is safe and could have little affect on cell performance but i still have lot to learn i hope it is not an expensive lesson

 

[SeaGal]

Is that a freezer in the picture?

If so... how about this? Not sure how they stack up for your "personal confusion and aesthetics" criteria, though

(https://diysolarforum.com/threads/one-very-cool-battery-box.73255/)

or this..

(https://diysolarforum.com/threads/diy-lifepo4-in-chest-freezer.86848/post-1180108)

 

[Ext194]

Is that a freezer in the picture?

If so... how about this? Not sure how they stack up for your "personal confusion and aesthetics" criteria, though

(https://diysolarforum.com/threads/one-very-cool-battery-box.73255/)

or this..

(https://diysolarforum.com/threads/diy-lifepo4-in-chest-freezer.86848/post-1180108)

Yeah full of food already

 

[chicagoandy]

I am assembling mine like this:

3/4 inch birch panels held by 1-inch extruded aluminum. I'll be placing 1/8 inch neoprene foam between the birch panels and the batteries, and exoxy insulators. The design is incorrect in that the BMS will be fully covered by the top panel, and of course there will be birch end-panels as well.

I'll then take two of these and stack them vertically. As for compression, they will be assembled so they are tight, with 1/8 neoprene foam. 2X24VX314 AH for 16kwh, installation in an RV. The aluminum frame allows them to be bolted to the structure of the RV.

 

[Ext194]

Thanks for feedback everyone I appreciate it

 

[HRTKD]

Some compression is good no matter the environment. It keeps any swelling from affecting the cell terminals/busbars.

In a mobile environment, you darn well better have those cells compressed so they don't move.

@chicagoandy, from your drawing, I don't think you'll have much (if any) compression of the cells. I would not consider that as an acceptable solution. I would not put that in my RV. If the black panel is a 1/4" thick sheet of metal that is located inside of the 8020 frame then it might work, but the compression wouldn't be even across the face of the cell.

@Ext194, maybe you could stack the cells? 8s on the bottom, 8s on the top, connected by busbars or suitably sized cable.

 

[chicagoandy]

@chicagoandy, from your drawing, I don't think you'll have much (if any) compression of the cells. I would not consider that as an acceptable solution. I would not put that in my RV. If the black panel is a 1/4" thick sheet of metal that is located inside of the 8020 frame then it might work, but the compression wouldn't be even across the face of the cell.

The black panel is 3/4 Birch ply, capable of many hundreds of pounds of force as it is constrained on all 4 sides. Certainly sufficient to constrain movement, even in a high-g situation. It will also compress as the cells swell, but will provide minimal compression at the start. Lastly it is constraining only two cells thick, so actual compression force will be less than the typical configuration. I think we're good.

I'm also a believer that actual compression isn't critical at lower discharge rates.

 

[HighDesertOffgrid]

Is that a freezer in the picture?

If so... how about this? Not sure how they stack up for your "personal confusion and aesthetics" criteria, though

(https://diysolarforum.com/threads/one-very-cool-battery-box.73255/)

or this..

(https://diysolarforum.com/threads/diy-lifepo4-in-chest-freezer.86848/post-1180108)

Lol. Love that the energy guide decal is still on the freezer.