What are the functions of the four interfaces of the lithium battery?

This battery interface is mainly used to detect the internal voltage of the battery.

The four interfaces of the lithium battery can detect the internal voltage of the battery to ensure the normal operation of the battery. These four interfaces are connected via high-current shrapnel microneedle modules to ensure stability. Current transmission, to avoid charging and discharging at the same time and extend battery life.

I have a universal charger. A lithium battery. The universal charger allows you to charge the battery and also has a USB interface

You are too modest. If you were stupid, could you still make a mobile power supply?

Required materials:

Lithium battery charging board;

Lithium battery charge and discharge protection circuit board (if it is a batlithium erie with built-in protection board, this material can be omitted

3.7V → 5V boost circuit board (the output of this circuit already has a USB socket

Lithium battery charging circuit board lithium battery (some ICs integrate the charging circuit and boost board); /p> Lithium battery (if you have it, you can omit this material. But it is not recommended to use used batteries. The battery life of the mobile power supply made with used batteries is too short and the meaning of the mobile power supply is lost.

Battery power display circuit lithium

Shell

Wires

Soldering iron, soldering wire and flux

Production steps:

Connect the battery terminal. from lithium battery charge and discharge protection circuit to lithium battery You can decide to use a single lithium battery or multiple batteries.ies to lithium in parallel. according to your needs. If the lithium batteries need to be connected in parallel, find metal connectors for the parallel connections of the lithium batteries and butt solder the connectors on both ends of the battery. If the battery has a charge and discharge protection circuit inside, this step can be omitted.

Connect the charging terminal of the lithium battery charge and discharge protection circuit to the output terminal of the charging circuit. If the battery has a charge and discharge protection circuit inside, you can directly connect the positive and negative poles of the battery to the output of the charging circuit.

Connect the output terminal of the lithium battery charge and discharge protection circuit to the input terminal of the boost circuit board. If the battery has a charge protection circuit anddischarge inside, you can directly connect the positive and negative poles of the battery to the input terminal of the boost circuit board.

Connect the positive and negative plates of the battery to the lithium battery power display circuit;

Connect the input interface of the charging end , the USB plug interface of the output end and the indicator light or power display indicator on the case opening location. Put these electrical devices and lithium batteries in a case and secure them.

In this way, a mobile power supply is completed.

Of course, if you want to make the different circuit boards mentioned above, you will need more components. Generally, most components used today are patch components, which you cannot solder by hand. If you want to use separate components, the volume will be ttoo big after making it, and you will have to find the corresponding circuit diagrams and buy the components separately, which is quite difficult. I won't explain it in detail here.

● ?I hope my answer can be helpful to you.

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● ?The above content is written based on from the personal experience of "Stupid Don't Know", only represents personal views and opinions, no one can modify, delete or add at will; plagiarism is strictly prohibited; If you must cite, please indicate the source.

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You can try it first. Install a charged lithium battery, plug it in via USB and plug the other end into your phone to see if it's charged? No, you need to disassemble the back and connect the positive and negative wires from the battery to the bedhium to the positive and negative wires of the USB (you need to add a switch in the middle. When you need power bank, turn it on and off when you need to charge the lithium battery).

I wish you success!