Can pouch cells physically rest on the tab side?
- Thread starter SunGear
- Start date
999zip999
100 TW
What cells there may be a ez solution.
999zip999 said:
https://m.made-in-china.com/product/High-Safety-Li-ion-Batteries-3-7V-60ah-Lithium-Battery-Pouch-Cell-for-Electric-Vehicle-1957693105.html
I'm adding cells to am existing battery so I'm matching existing cells and I have a size constraint so I'm looking at having to have cells stand up on end
I don’t think it’s a good idea to have any weight on the actual tabs. Seems like vibration could cause insulation failure or cracking of the tabs. You might be able to support the cells on either side of the tabs.
DogDipstick
100 kW
No.
Not a good idea at all. I always place on face, or base, of cell. On (bottom) end. Never on tab.
Not a good idea at all. I always place on face, or base, of cell. On (bottom) end. Never on tab.
DogDipstick
100 kW
SunGear said:
Load transfer is a fine point of engineering ( the way load travels inside a beam, on a surface, through a medium)... and anything is possible if you are good at designing. However, gravity will always pull downward....
I would make a U shaped brace, and strap the cells in teh middle, to the high sides of the U shaped brace, if you must absolutely have the cell tabs pointing downward against gravity. YOU dont want them smashed downward with the weight of the cells... so a suspended pack strapped into the middle of a U shape brace. Keep load ( weight ) off the tabs for longevity and peace of mine.
methods
1 GW
I have pictures
I never put tabs down
* Condensation inside battery
* Thru condensation cycle water go to bottom
* Make electrolysis soup
I have packs that have been around for a decade. Those with the tabs up... They show some damage to the bottom of the pouches but not much
Another pack I laid out in the rain for one day tabs down, wicked green and blue soup
I tried to only use can cells now, and I prefer 3.3V.
-methods
I never put tabs down
* Condensation inside battery
* Thru condensation cycle water go to bottom
* Make electrolysis soup
I have packs that have been around for a decade. Those with the tabs up... They show some damage to the bottom of the pouches but not much
Another pack I laid out in the rain for one day tabs down, wicked green and blue soup
I tried to only use can cells now, and I prefer 3.3V.
-methods
I can keep most cells flat but some of them will have to be up on end. I'll have to stick to the neoprene foam spacer for to space but I'll definitely ensure the load doesn't go through the tab itself....maybe double sided tape them on the battery wall? Feel like that could damage the pouch though... Actually I think I could design a 3d printed bracket, with a layer of the neoprene foam, to transfer the load around the tab and on to the side of the cell.
Good point on the water. I can at least make sure those cells stand higher on a cushion or something. The battery box will be full seam welded and lid/wire pass throughs thoroughly caulked so this should prevent any water ingress (do you think I should add a gortex vent?...I was going to at least throw in some silica packs).
...would it be possible to find cells that match but with both tabs up?..I'm not sure how possible that is. Current cells are my best guess.
Good point on the water. I can at least make sure those cells stand higher on a cushion or something. The battery box will be full seam welded and lid/wire pass throughs thoroughly caulked so this should prevent any water ingress (do you think I should add a gortex vent?...I was going to at least throw in some silica packs).
...would it be possible to find cells that match but with both tabs up?..I'm not sure how possible that is. Current cells are my best guess.
999zip999
100 TW
Methods I'm familiar with 3.3 volt cells as being lifepo4 or 3.2v So what do you consider 3.3 volt. ?
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