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Apr 07, 2014, 08:14 PM
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Lipo salvaging

In a nail biting desoldering session, managed to recover the loose cells from some puffed lipos, dating back to 2007.

Most of the loose cells were still good. Some were slightly puffed. Only 1 puffed cell was clearly not holding a charge.

Some puffed cells had breached their aluminum wrappers, yet not exploded. There's either 1 final layer of protection or the lithium reacted very slowly.

There is exactly 1 very blurry, shaky goo tube video in which a guy unsuccessfully attempted to document the inside of a lipo. He never mentioned if it was fully discharged, what precautions he took when unwrapping it, what happened to the lithium when exposed to the air, or how long the lithium could be exposed to the air. It is known that if the lithium sheets contact water, they'll start burning.

Ideally, a single cell could be boosted to any voltage, eliminating the problem of destroying an entire battery when 1 cell puffs. A simple boost converter was very inefficient. It sucked 5A 4.2V to generate 6V 1.5A.

There's no convenient way to connect the loose cells in arbitrary series arrays to form arbitrary voltages. A backplane would be quite large & expensive. There are still many uses for 3.7V.
Last edited by Jack Crossfire; Apr 08, 2014 at 01:13 AM.
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