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I'm currently working on an electronic design which has a high risk of being exposed to temperatures up to 500°C and possibly more.

The specifications indicate that once the product is exposed to more than 80°C it needs to be replaced by a new one, so the electronics don't need to be qualified over typical industrial range temperatures.

I still have a problem with the energy source. I don't have big hopes that the client will let me design a system with a wireless charger linked to the standard power network, so I need to come up with ideas about batteries that will not explode when exposed to fire.

I need 2.5V or more, for 1 Ah.

Do batteries which won't explode exist/are currently publicly available or should I ask for help about thermal isolation to slow down the temperature rise for hours?

My electronic device is supposed to sense different parameters (like pressure, shocks,...) and log data locally to be gathered regularly through NFC. For the enclosure, I could say based on the mechanical model I got 50x100x100 mm. Expected operating time is 6 months.

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  • \$\begingroup\$ I would be interested to find out if anyone has experience with high temperature battery’s just out of personal curiosity. Few comments to further your description, how big of an enclosure are we talking about? & what’s the expected operation time? What sort of capacity will the battery require? You could also consider using Peltier devices to control the battery temperature in the battery enclosure. I suspect going down the thermally isolating enclosure route with some fire retardant UL94-0V material will be the solution \$\endgroup\$ – Jack Soldano Aug 17 '20 at 9:29
  • \$\begingroup\$ My electronic device is supposed to sense different parameters (like pressure, shocks,...) and log datas in local to be gathered regularly through NFC. For the enclosure, I could say based on the mecanical model I got 50x100x100 mm. But they said they could accept larger dimensiosn if needed. Expected operating time is 6 months I guess. But it will depend on the feasability study. The client can adapt his maintenance schedule. About capacity, I would be happy with 1AH. I didn't calculated consumptions now. \$\endgroup\$ – Prof_Sims Aug 17 '20 at 9:35
  • \$\begingroup\$ What voltage do you need? \$\endgroup\$ – Bruce Abbott Aug 17 '20 at 9:43
  • \$\begingroup\$ 3,7V would be good. All the electronics I've selected can be powered at 2,5V. \$\endgroup\$ – Prof_Sims Aug 17 '20 at 9:48
  • \$\begingroup\$ good ole lead acid and coal-zinc won't explode if vented properly, I'd guess. Convince your client that you need to put the power source outside of your furnace or volcano or whatever this is, for safety and environmental reasosn :) \$\endgroup\$ – Marcus Müller Aug 17 '20 at 10:36

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