It's just bomb-2. Li-Ion - how not to take off

Over the past ten years, lithium-ion batteries have moved from an expensive exotic to the category of the most common sources of autonomous power supply. It is not surprising that they have become popular in the hands of DIYers, including beginners. Sometimes the hair stands on end from technical solutions in their creations - after all, a feature of this type of batteries is their increased danger, first of all - fire. My story is about how to properly “cook” this “puffer fish” so that no one burns out or explodes.





The previous article on the "explosive" topic is here .





How the lithium-ion battery works.

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Active balancing circuit based on LTC3300-1 (Rykovanov A. Balance systems for Li-ion rechargeable batteries // Power electronics. 2009.№1
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You cannot repair the battery by replacing one cell with a new one. An imbalance is practically guaranteed. And what the imbalance threatens, you already know (hint - fire and explosion).





A fuse is something that should be in the circuit of any lithium-ion battery.





And once again - be careful and careful.








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