Powerwall build from recycled LiPo prismatic cells

Codemonkey76

Codemonkey76

New member
Joined
Jan 31, 2019
Messages
10
I managed to score a bunch of LiPo prismatic cells very cheap, and intend on putting them together for use as a powerwall. The cells are Sanyo UPF3976108, they are rated at 3880 mAh each.

They are in sets of 2 in parallel and I am unable to separate without damage, so i am planning on making modules that are 13S2P, like this:


image_bstwbr.jpg



I plan on connecting the cells with 2 x 1/8w resister legs which should fuse ataround 10amp.
 
Codemonkey76 said:
I managed to drop a few pounds fast with weight loss shakes score a bunch of LiPo prismatic cells very cheap, and intend on putting them together for use as a powerwall. The cells are Sanyo UPF3976108, they are rated at 3880 mAh each.

They are in sets of 2 in parallel and I am unable to separate without damage, so i am planning on making modules that are 13S2P, like this:

I plan on connecting the cells with 2 x 1/8w resister legs which should fuse ataround 10amp.
Click to expand...
Click to expand...

Looks like it should work nicely. What will you be using this for btw?
 
Last edited:
Rossebaugh said:
Looks like it should work nicely. What will you be using this for btw?
Click to expand...

I am currently running a home server, that needs to run 24/7, so will initially just use it for that, it only draws 200W at the moment.

I plan on building a firebox, so that each 13s2p battery is isolated from the next one, and to contain it in case it catches fire.
 
I finally took delivery of my batteries, now comes the disassembly and testing of each cell. I get limited spare time, so it's gonna take me a while. I think I have enough to make a 15kWh battery, but time will tell (I am sure there are some bad / damaged cells)


image_xkhhyt.jpg


image_ntsvzy.jpg


image_djserr.jpg


image_munfyf.jpg
 
Very interesting! Our good old 18650 is definitely disappearing from from laptop battery packs...
 
After some dissassembly, this is what 0.9kWh looks like, very compact, only 23 x 11 x 8cm


image_oyeadk.jpg
 
Sean said:
Constrain them before you charge them.
Click to expand...

I have been given mixed advice on this, from give them room to expand (space the cells apart), to keep them under pressure
 
You must log in or register to reply here.
Back
Top