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| Cheapest way to detect 0°C (+/-5°C) to limit lipo charge current when <0°C |
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| SiliconWizard:
I'm always pretty sad (when not concerned) when I see engineers designing devices arounds Li-ion (/LiPo) batteries with the "cheapest" solution as a goal. How many times will we have to say that those batteries are not toys and that shit still happens when you mishandle them? It's pretty impossible to get even +/-5°C reliably with a diode or bipolar transistor IMO unless you select them one by one. Your bet could be to add means of trimming the threshold on the board, which would not necessarily be very stable over time and would add significant production cost... If something like a TMP390 is still too expensive, there may be some chinese ICs that are equivalent for a fraction of the cost. That'll take some time to find, but I'd tend to favor that if you really have to go low cost. |
| thm_w:
--- Quote from: AloyseTech on December 11, 2019, 01:04:52 pm ---I forgot to mention that it is mandatory that the battery charges below 0°C, the charger must not shutoff. Most charger with temperature management will simply shutoff if not between 0°C and 125°C. --- End quote --- What is the point of protecting the cell from starting charging below 0C, but not protecting it from starting at 1C and having it drop to -10C? In either case it will suffer. https://electronics.stackexchange.com/questions/263036/why-charging-li-ion-batteries-in-cold-temperatures-would-harm-them |
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