How do i seal Li-on batteries....

[steamhit]

A quick question is there any other way to seal your Li-on batteries for safety issues?

 

[Java_Az]

You don't want to seal the battery. You basically create a hand grenade by sealing it. For safety vent holes are put into mods so if in the unlikely event of a battery venting the mod doesnt blow up in your hand. Vent holes should point away from the users face also.

 

[kcofohio]

The vent holes could be filled with wax, or something of that nature. You would also probably need o-rings at the threads. Plus you'd need a sealed switch. But, as Java said, you need vent holes, or you weakest link would be the atty connector, which is usually pointed at ones face. Any thoughts on that?

 

[Cee_Jay]

The vent holes could be filled with wax, or something of that nature. You would also probably need o-rings at the threads. Plus you'd need a sealed switch. But, as Java said, you need vent holes, or you weakest link would be the atty connector, which is usually pointed at ones face. Any thoughts on that?

Just one . . . . . [size=+3]OUCH !![/size]

 

[AriM]

DO NOT EVER seal any type of battery....a battery creates off=gassing during storage and normal operation...at he very least it needs a one way valve to extract gasses (this is how batteries in sealed compartments work). By sealing a cell entirely you are essentially creating a bomb. You would not be creating "safety", you would be removing some. If you are concerned about Lithium battery volatility, looke into LIfe batteries....Lithium Iron Ferrite, is MUCH less volatile and handles high discharge rates much better, than Lithium-ion or any Lithium-polymer style battery. The only down side is smaller a/h ratings and a bit less current in the same size package...but the safety concerns far outweigh a few hundred maH and 3/10 of an extra volt

 

[kcofohio]

That is why I suggested wax, as it would melt easily, but keep moisture out. From the video I saw in another thread, the Li-po began to heat up, before it expelled gases. Wax is soft and would either melt or blow out.

 

[AriM]

it's a good point...I am not sure that in a short the wax would have time to melt, but in a situation where it was simply over drawing the cell, it would def get hot before blow-out. the thing that worries me most about sealed cells are the chance for fast over current =, in which case you would have a catastrophic failure in a matter of fractions of a second (if the battery cell was to become a capacitor). in that situation (prototyping for example) the wax would do almost no good. the casings of most modern (cheap) cells are very easy to rupture. In a higher grade cell, with a metal or high tensile composite case, i would worry less about case failure, and the wax sounds like a great idea....another option would be solidified flux....the flux would melt at a much lower temp and flow away from the vent faster....food for thought....in fact if you had a clean spot on the cell for the flux to flow to...even better....