Do CC CV buck converters terminate charging

Projects General Guidance
1

Hiya, I bought some of these CC CV buck converters off AliExpress: here

I tried looking around but haven't found an answer to my question; do these modules terminate charging after the battery is fully charged? Thanks!

2

Your link does not work. Thanks for trying to make a proper link instead of just pasting an address into your post like many beginners do, but it's always a good idea to use "Preview" and check the link actually works. You can still modify your post above and correct the link.

If the buck convertor is not sold as a battery charge controller, then you bought the wrong part.

3

buck converters generate a fixed voltage. just a power source, nothing more

4

PaulRB:
Your link does not work. Thanks for trying to make a proper link instead of just pasting an address into your post like many beginners do, but it's always a good idea to use "Preview" and check the link actually works. You can still modify your post above and correct the link.

If the buck convertor is not sold as a battery charge controller, then you bought the wrong part.

Sorry about that, the buck converter is listed as a CC CV battery charger.

5

it's right there, in plain clear incomprehensible jibberish: "When the lithium ion battery voltage is low, if directly with constant voltage charging, due to pressure difference is big, cause the charging current is too large, lead to battery damage, so start to use constant current charging the battery, when charging to a certain degree of automatic switch back to the constant voltage charging"

so there you have. what you have makes no sense to me, but you have it.

6

I think it will 'stop charging' in that the CV limit will match the battery voltage and no current will flow.

7

It's difficult to read the odd translation but there is a mention of 0.1C and I know that some lithium chargers will terminate the charge when in CV mode the output current drops to 1/10th of the constant current set for the first CC phase of charging.

I can't tell if that charger will do that or not. You'll just have to test it. Once it's switched into CV mode the current will gradually reduce. Just wait to see if the charge terminates...it won't do any real harm even if it hasn't terminated after a few hours.

Steve