| Electronics > Projects, Designs, and Technical Stuff |
| What is this device? |
| (1/2) > >> |
| 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 |
| Navigation |
| Message Index |
| Next page |