I made myself a charger for four lithium-ion batteries. Someone will now think: well, did and did, such is full on the Internet. And I immediately want to say that my design is capable of charging both one battery and four at once. All batteries are charged independently of each other. This makes it possible to simultaneously charge batteries from different devices and with a different initial charge. I made a charger for 18650 batteries, which I use in a flashlight, powerbanks, laptop, and so. The circuit consists of ready-made modules and is assembled very quickly and easily.
Will be required
Making a charger for a different number of batteries
First make the battery compartment. To do this, we take a universal circuit board with a large number of holes and ordinary paper clips.
Biting off the corners here at the clips.
We insert into the board, after trying on the length of the batteries you need. Because such a charger can be made not only under 18650 batteries.
Solder parts of clips from the bottom of the board.
Then we take charge controllers and place them on the remaining board space, preferably opposite each battery.
The charging controller will be mounted on such legs made from the PLS connector.
>img src="https://sdelaysam-svoimirukami.ru/uploads/posts/2018-03/medium/1521645064_7.jpg" style="max-width: 100%;" alt="Charger for lithium-ion batteries">
Solder the module from above and below to the board. These legs will run the supply current to the module and the currentcharge to batteries.
Four sections are ready.
Next, to switch the charging places, install the buttons or toggle switch.
The whole thing connects like this:
You ask - why the buttons are only three and not four? And I will answer - since one module will always work, because one battery will always be charged, otherwise there is no point in sticking the charger at all. Solder the conductive tracks.
The result is that you can connect the charging space for 1 to 4 batteries with the buttons.
The charge module is equipped with an LED that indicates that the battery,which charges from it - charged or not. I assembled the entire device in half an hour. It is powered by a 5 volt power supply (adapter), by the way, it also needs to be chosen wisely so that it draws all four batteries at the same time. You can also power the entire circuit from a USB computer. Connect the adapter to the first module, and then turn on the necessary buttons and the voltage from the first module will move to other places, depending on the included switches.