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Charging a protected Li-Ion cell with a protected charger

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PinheadBE:
Hi,

I just wondered if it is ok to charge a protected 18650 cell with a charger that also has protections.
Something like this: https://www.aliexpress.com/item/12V-Charging-UPS-Uninterrupted-Protection-Integrated-Board-18650-Lithium-Battery-Boost-Module/32892470149.html

Aren't the two protection circuits going to pose problems ?

I suppose it will be ok, but, better be safe than sorry

Thanks

spec:

--- Quote from: PinheadBE on January 12, 2019, 08:36:42 pm ---Hi,

I just wondered if it is ok to charge a protected 18650 cell with a charger that also has protections.
Something like this: https://www.aliexpress.com/item/12V-Charging-UPS-Uninterrupted-Protection-Integrated-Board-18650-Lithium-Battery-Boost-Module/32892470149.html

Aren't the two protection circuits going to pose problems ?

I suppose it will be ok, but, better be safe than sorry

Thanks

--- End quote ---
Hi PinheadBE,

Never heard of any problems charging a protected LiIon battery with a normal charger.

From a theoretical point of view there will not be a fight between the two protection schemes because the scheme with the most stringent settings will function first and the other protection scheme will not be triggered.

The only area where the built-in protection could get triggered is if you had a fast charger with a very high charge current.

By the way, I understand that all first-tier manufacturer's large LiIon batteries have a built-in thermal fuse.

PinheadBE:
Thank you for your reply

Daixiwen:

--- Quote from: spec on January 13, 2019, 08:22:36 am ---By the way, I understand that all first-tier manufacturer's large LiIon batteries have a built-in thermal fuse.
--- End quote ---
No it's usually a circuit breaker triggered by an increase of the internal pressure. But you shouldn't consider this as a replacement for a safety mechanism. There are ways to provoke a fire without triggering the circuit breaker, by example by very slowly charging the battery slightly above the thermal runaway voltage with a very small current. Low temperatures make this easier too. So don't count on that safety as the only one against a defective charger.

By the way battery manufacturers don't like using the words "fire" or "explosion" so I should probably say "fast uncontrolled disassembly with high temperature degassing"

PinheadBE:

--- Quote from: Daixiwen on January 14, 2019, 09:27:01 am ---By the way battery manufacturers don't like using the words "fire" or "explosion" so I should probably say "fast uncontrolled disassembly with high temperature degassing"

--- End quote ---

 :-DD :-DD :-DD  Thank you: You just made my day !  :-DD :-DD :-DD

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