How to make a POWERBANK from an old phone battery. We collect Power Bank with our own hands Power bank electrical circuit diagram

6. Connect the battery to the stabilizer board. To do this, connect the black "negative" wire to the "P-" terminal, and the red "positive" wire tocontact "P +" At the same time, the stabilizer will blink once with all three LEDs.

All. Our self-made PowerBank is ready. We check the work by clicking on the only button, which, when not connectedconnectors, turns on the charge level indicator, which shows that our batteries are now fully charged.

That's basically the whole process. In terms of time, with experience and tools, it takes about 1 hour.
If you are not confident in your abilities, we Power Bank using any Li-Ion batteries present inour catalog.

In our store there are already assembled, ready-to-use Power Banks based on the H284 set.

A. A smartphone is a device that has become an indispensable device for all people to communicate. They are used to access the Internet and often for a long time. But smartphones have one drawback - it's battery life. In the best case, the battery will work without recharging for one day, and if you actively use it, then several hours. This article and the accompanying video show you how to make a powerful homemade Powerbank that can even charge simultaneously for a smartphone or tablet, or a combination of the two.

You can buy a baby monitor, which is described at the beginning of the video, and all the components of the power bank in this Chinese store. How to receive a cashback (refund) in the amount of 7% of the price of all purchases is on our website. Download schematic, board and other project files.

In order to improve the performance of mobile phone batteries, portable chargers were ordered, which are commonly called poverbank. But in a single form, such a device is not even half capable of charging the phone's battery. And even three such devices do not give a way out of the situation. Buying a powerful power bank is quite expensive. A normal powerbank, say, with a capacity of 10,000 milliamps costs 25-30 dollars. Given this and the long waiting time for the package, it's easier to make your own version.

Description of the power bank scheme

The powerbank circuit consists of three main parts. This is a lithium battery charge controller with auto-shutdown function when fully charged; battery compartment with 18650 lithium-ion batteries connected in parallel; a 5-10 amp power switch from a computer power supply; boost converter to increase the voltage from the battery to the desired values ​​of 5 volts, which are needed to charge a phone or tablet; USB connector to which the charging device is connected.

In addition to simplicity and low cost, the presented circuit has a high output current, which can reach up to 4 amperes and depends on the rating of components such as a field effect transistor, an output Schottky diode and an inductance. Chinese counterparts are capable of providing an output current of not more than 2.1 amperes. This is enough to charge a couple of smartphones at the same time, and our power bank can handle 4-5 smartphones.

Consider the individual components of the structure. As a power source, 5 parallel-connected 18650 batteries from a laptop. The capacity of each battery is 2600 milliamps per hour. An adapter or inverter case is used, but another suitable case can be used. We will use a charge board purchased as a charge controller. The charge current is about 1 ampere. An inverter that will increase the voltage from the battery to the required 5 volts can also be taken ready-made. It is very cheap. Maximum output current up to 2 amps.

Circuit Assembly

At the first stage, we fix the batteries, fasten them together with a glue gun. Next, you need to connect a controller to the battery to check how the charging process is going. You also need to find out the battery charge time and understand if the auto-shutdown works when fully charged. Everything is signed in detail on the board.

You can charge from any USB port. The indicator should show that charging is in progress. After 5 hours, the second indicator lights up, which means that the charging process is completed. If a metal case is used, additionally insulate the batteries with a wide adhesive tape.

One of the main components of the circuit is a step-up dc-dc converter, an inverter - a voltage converter. It is designed to raise the voltage from the batteries up to 5 volts, needed to charge the phone. The voltage of one battery is 3.7 volts. Here they are connected in parallel, so an inverter is needed.

The system is built on a 555 timer - a field-effect transistor and output voltage stabilization, which is set using a zener diode vd2. A zener diode may have to be selected. Any low power zener diode will do. 0.25 or even 0.125 watt resistors. Choke L1 can be removed from the computer power supply. The diameter of the wire is at least 0.8, it is best to make 1 millimeter. The number of turns is 10-15.

A frequency-setting node is assembled in the circuit, which sets the operating frequency of the timer. The latter is connected as a rectangular pulse generator. With this selection of components, the operating frequency of the timer is about 48-50 kHz. Gate limiting resistor R3 for a 4.7 ohm FET. Resistance can be from 1 to 10 ohms. You can replace this resistor with a jumper. Field effect transistor of any average power with a current of 7 amperes. Field workers from motherboards will do. A small reverse conduction transistor vt1. A kt315 or other low power reverse conduction transistor will do. Rectifier diode - it is desirable to use a Schottky diode with a minimum voltage drop across the junction. Two containers stand as a power filter.

This inverter is pulsed, it provides high efficiency, high stabilization of the output voltage, does not heat up during operation. Therefore, power components do not need to be installed on the heat sink. If there are difficulties with Schottky diodes, then you can use the diodes that are in computer power supplies. Dual to-220 diodes are found in them.

In the photo below, the inverter is assembled.

You can make a printed circuit board. There is a link in the description.

5 volt inverter test

We check the inverter for operability. The smartphone is charging, as you can see, the charging process is in progress. The output voltage is kept at 5.3 volts, which is fully compliant. The inverter does not heat up.

Final body assembly

From a piece of plastic, we need to cut the side walls. The charge controller has two LED indicators that show the percentage of charge. They need to be replaced with brighter ones and brought to the front panel. Two holes for micro USB connectors are cut out in the side wall, that is, two devices can be charged at the same time. There are also holes for LEDs. A hole for the controller, that is, for charging the built-in batteries. A small hole for the power switch will also be made.

All connectors, LEDs and the switch are fixed with a glue gun. It remains to pack everything into the case.

A USB tester is connected to the output of the device. It can be seen that a voltage of 5 volts is firmly held at the output. Let's connect mobile phones and try to charge them from a homemade Power bank. Two smartphones will be charged at once. The charge current jumps to 1.2 Amperes, the voltage is also normal. The charging process is running successfully. The inverter is working flawlessly. It turned out compact and, most importantly, stable. The circuit is easy to assemble, all familiar components are used.

Nowadays, electricity is one of the most important things. It is used everywhere, for lighting, communication, or simply for the operation of household devices. And electricity, like everything else, tends to end. It is possible that at any time your phone or laptop may run out of power, and it will be impossible to connect it to the network in this situation.

Then Power bank comes to the rescue - an external battery. It can help extend the life of your device. You can see an example of a Power bank in the photo below.

In principle, such things can now be freely available in an electrical engineering store. However, there external batteries cost decent money, and it is not always appropriate to buy it when you can do it yourself at home. Therefore, we want to present a few simple instructions for creating a Power bank at home.

External battery from mobile phone batteries

One of the easiest ways to create a power bank at home is to assemble it from mobile phone batteries. After all, a modern person has a bunch of old unnecessary phones lying around somewhere. Do not rush to throw them away, it turns out they can still be useful to you.

Necessary materials:

• Batteries from cell phones;
• Controller with USB connector;
• A pair of wires;
• Box.

First, it is necessary to clarify that the batteries should be as similar as possible, it will be easier (other lithium-ion batteries can be used instead of phone batteries). And all of them must be of the same volume, in our case it is 1020 mAh each.

Their number only affects the volume of the future Power bank, but from 6000 to 20000 mAh in general will be optimal. In addition, any of them requires energy for their own work, so it is necessary to subtract about 20-30% from the total power. This will be the net charge that your external battery can give out.

The connector on the controller can be absolutely anything, just the way you need it. It's just that USB is the most common, so we chose it.

So, when everything is assembled, you can start assembling our device.

First, let's group the batteries for greater convenience. To do this, we install them parallel to each other and fix it all with tape or tape (everything is done taking into account your batteries). Important! Contacts must be open!

Now you need to solder the batteries and the controller to each other, namely the “+” and “-” contacts (these are extreme). Don't touch the center ones. Then, in the “body” of our Power bank, we estimate the location of all the elements and mark the places for future connectors. It remains only to make holes and fix all the elements with hot glue in the box.

All is ready! This power bank of batteries is enough for you to recharge your phone several times.

Power bank from a regular flashlight

On the market now you can find flashlights with recharging other devices, and we will try to do about the same. Such a device will combine both a flashlight and an external battery.

Necessary materials:

• Simple flashlight;
• Voltage converter with USB connector (for 5 V);
• charge controller.

To begin with, we will disassemble the flashlight and pull out a resistor from there, the one to which a small LED is soldered. We won't need it anymore (at least here). Instead, we put a battery charge controller there.

Now, in the place where the flashlight was recharged, we put a converter with a USB connector (again, the connector can be the one you need).

Next, you need to solder "+" and "-" from the flashlight battery to the controller. Now solder our power converter and OUT+/OUT pins on the controller. Do not forget to release the flashlight button and connect it to the energy converter.

After all the work done, we need to check if our device works. If everything is fine, then we attach all the elements using the same hot melt adhesive and assemble the installation together.

Now the power bank from the flashlight is ready to use.

These were just the most common and easy-to-make ways to assemble an external battery. There are a huge number of other methods, but they require much more free time, and their cost is much higher. But that doesn't mean they are better.

DIY power bank photo

Since portable electronic devices, such as tablets, netbooks, cameras or smartphones, are currently the most widely used, there has been a big problem in ensuring the recharging of these devices, since often some people do not have the opportunity to power the battery of their equipment from electric power during the day. networks. This task was successfully solved thanks to external batteries or, in other words, power banks, thanks to which it became possible to recharge your device while being outdoors, in nature or in transport.

Of course, power banks are now mostly inexpensive, but if you want, you can easily create it yourself. Its manufacturing process provided you have the necessary components, it will not take much time. Two or three hours will be enough. The main thing is that you have the desire to go through all the required steps, and, in addition, your ability to solder and understand electrical circuits will be useful.

If you are interested in how quickly and without any hassle to collect a power bank you can watch this video online.

Do-it-yourself schemes for the development and creation of power banks

From mobile phone batteries

One of the easiest ways. You will need to follow the following steps for this purpose:

Power bank from a lantern

In order to make a power bank with your own hands using a flashlight, you need to prepare the following items: the flashlight itself with a battery of three point seven volts; charge fee; a voltage converter that is capable of converting a flashlight voltage of three point seven volts into five volts, always with a USB output.

Procedure for creating homemade power bank is the following:

Power bank on finger batteries

In order to make such an external battery, take two matchboxes, bend one of the walls at each of them, and glue these boxes to each other. Then put two batteries in each of the boxes. Using staples, ensure a reliable connection of the boxes to each other and additionally wrap them with wire. Choose a case for your external battery. It will be very good if the distance between the matchboxes and the case is minimal or completely absent.

After that, find a large plastic jar that can fit your power bank, and cut a hole in its lid where you attach the USB connector. Solder a wire to this connector and connect it to your power bank. Put your external battery in a jar and close it with a lid. Now the manufacture of the power bank is finished, and you can use it to meet your own needs.