Lithium-ion 18650 cells

[Graham.]

Explosion containment pie dish actually ;-)

[Harry Bloomfield, Esq.]

I'm busy messing with Lithium-ion 18650 cells and came across one in a piece of equipment, which had none of the commercial ID, just a part number and rather than being in the usual sealed container, was in a sealed plastic bag with the ends heat sealed, just the tags poking out the ends. Inside, it seems to be spiral roll, like a mini-toilet roll, with the electrodes separated by paper or plastic.

The normal 18650 item is either like an oversized AA look to it, or AA style, but with tags.

[Andy Bennet]

What makes you think it's an 18650? The clues in the number - 18mm dia * 65.0 mm long.

[Adrian Caspersz]

Rolled up mobile phone, tablet battery. Neat.

If it's re-manufactured as crude as that, it's going to be under some fine pressure if the cell gets overcharged and decides to vent.

Can you see any builtin protection?

I'd send it to BigClive.

[Harry Bloomfield, Esq.]

Andy Bennet brought next idea :

That is what the design spec of the equipment says it is.

Yep, near enough and 3.7v 2200mA

[Adrian Caspersz]

Or maybe that's how the cells are made these days, and they are ditching the metal can...

[Harry Bloomfield, Esq.]

No, definitely none at all.

[Andy Burns]

Sounds like a LiPo "pouch" battery, make sure to have your fire containment pie dish to hand ...

[Jake56]

"Harry Bloomfield"; "Esq." [e-mail]> wrote in message news:raggch$c8m$ [e-mail]...

Weird.

That's how they all are, Big Clive has teardowns.

[Brian Gaff (Sofa)]

How strange. Sounds a bit lethal if anyone punctures the outer seal. Brian

[F Murtz]

Less likely,explosions need to be in a container.