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What is this device?

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Prehistoricman:
I found this odd looking 3-terminal device in a laptop battery pack. The board does the charge controlling.

Is this some kind of thermal fuse? It's glued onto these two power FETs. But why 3 terminals for a fuse and not 2?

It's been a long time since I took this picture. I might not have the board any more and I certainly don't have it immediately on hand to do any tests on, sorry.

ataradov:
It looks like there is F1 poking from under the pin. It is likely to be a thermal fuse. The third terminal is likely for mechanical reasons. It does not seem to be connected anywhere as well.

xavier60:
I used to think it's a fuse with a built in heater. The fuse can be instructed to go open by energising the heater part. The idea is so that the BMS can blow the fuse without needing a crowbar circuit that can handle the full fusing current.
I used to be able to find info with a Google search, today I find nothing so far.

xavier60:
https://www.schott.com/epackaging/english/cutoff/sh_type.html

Cerebus:

--- Quote from: xavier60 on February 25, 2020, 11:53:39 pm ---I used to think it's a fuse with a built in heater. The fuse can be instructed to go open by energising the heater part when the warranty timer runs out.

--- End quote ---

TFTFY

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