Electronics > Projects, Designs, and Technical Stuff

Li - Ion Smart / Battery Charger

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StreetRooster:
Hi Everyone

I have a number of 3.7V 6600mAH Li batteries, and am asking if anyone has a circuit for a smart charger for my batteries.

aldi:
We need more specifications, such as:
Input voltage, charge current, interface (I2C or just pins?). Any need for protection? And what do you mean with "smart"?

Gandalf_Sr:
I've done several designs, it's best to use an IC dedicated to charging Lithium batteries, Texas Instruments have several.  What is the maximum charge current?

StreetRooster:
Thank you or replying to my post.

What I mean by " Smart " is that when I start charging the battery the charger will be able to detect the battery's Voltage.
In my case these are 3.7V
It will then start charging in CC mode, in my case that will be 3A as these batteries are 6000mAH.
When the 3.7V is reached the charger then reverts to CV mode.
It will remain in this mode until a residual charging current of +- 150mA is reached and then switch off.
 :-//

Daixiwen:
What you describe is what most dedicated Li-Ion charging chips do. Just pick your manufacturer and any reference that can charge 1S batteries (meaning one element, and not several in series).
Double check your voltage though. 3.7V is most probably your cell nominal voltage, but its charging voltage is more likely 4.2V. If you charge it only to 3.7V you'll only get about half its capacity.

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