How to seal leaking alu battery cell body

[m.art.y]

Several of my VL41M cells have electrolyte leaks through the bottom - somehow tiny holes appeared. Other than that those cells work as normal so far. Wonder how to seal those leaks? Is there some cold welding alu paste or something? Tried epoxy but the seaping electrolyle ate through it before it had a chance to cure. Soldering? Welding? Any advice appreciated.

[arber333]

Several of my VL41M cells have electrolyte leaks through the bottom - somehow tiny holes appeared. Other than that those cells work as normal so far. Wonder how to seal those leaks? Is there some cold welding alu paste or something? Tried epoxy but the seaping electrolyle ate through it before it had a chance to cure. Soldering? Welding? Any advice appreciated.

Electrolyte is based on acetone solvent so it burns. No soldering and welding...
I would suggest you turn those cells around so you dont fight gravity. Then use nitro to clean the surface. After it is clean use duct tape to wrap those cells on the underside. It will work for some time but not forever.
What you would need would be to paint the casing in thick resistant primer coat.
Or maybe make a new tight alu case to enclose the cell...

[EV_Builder]

Or flip around and then epoxy maybe in combination with allot sheet?

[m.art.y]

Or flip around and then epoxy maybe in combination with allot sheet?

Allot sheet? Do you have a link/picture? I tried just epoxy but seeping through electrolyte ate through it.

[arber333]

Allot sheet? Do you have a link/picture? I tried just epoxy but seeping through electrolyte ate through it.

Yes problem is acetone which is in the electrolyte. It will dissolve epoxy hardener before reaction sets in.
Also it will probably not help. Maybe you can try using sika or similar glue/filler. I think the black rubber glue for gaskets is a good choice....

[EV_Builder]

Alloy i mean / Aluminum. It's easy to fold.
Yes the black window gasket filler might do it.

[m.art.y]

I would suggest you turn those cells around so you dont fight gravity. Then use nitro to clean the surface.

What is nitro by the way? Thinking what would be the best way to remove this crystalised electrolyte residue before I attempt some sealing..

[arber333]

What is nitro by the way? Thinking what would be the best way to remove this crystalised electrolyte residue before I attempt some sealing..

Nitro cleaner
https://www.multichimica.com/product/ni ... nner-1900/