DIY 18650 Battery Charger Project Tutorial

Building a DIY 18650 Battery Charger

Introduction

Components and Materials

• 2 pieces of 4x 18650 battery holder
• 8 pieces of TP4056 charging module
• A pair of XT30 connector (can handle up to 30 amps)
• Male headers

The Role of PCBWay.com

Design Considerations

• Efficiency: The charger should be able to charge batteries efficiently and safely.
• Capacity: The charger should be able to handle up to 8 batteries simultaneously.
• Current Rating: Each battery should receive a charging current of about 1 amp.

Conclusion

Resources

• Parts List
• Gerber Files

DIY 18650 Battery Charger Project Tutorial

In this tutorial, we will show you how to build a simple DIY 18650 battery charger using easily available components. This project is perfect for those who want to learn about electronics and have some experience with soldering.

Materials Needed:

• 1 x TP4056 Li-ion battery charging module
• 1 x USB Micro-B connector
• 1 x JST-XH 2-pin connector
• 1 x Diode (1N4007)
• 1 x Resistor (10kΩ)
• 1 x Capacitor (100nF)
• PCB or perfboard for assembly
• Jumper wires and electrical tape

Circuit Diagram:

The circuit consists of a TP4056 Li-ion battery charging module, which is specifically designed for charging 18650 batteries. The module has built-in overcharge protection and can charge the battery at a rate of up to 1A.

Assembly Instructions:

1. Solder the USB Micro-B connector to the PCB or perfboard, making sure to connect it to the correct pins on the TP4056 module.
2. Solder the JST-XH 2-pin connector to the PCB or perfboard, connecting it to the battery terminal.
3. Connect the diode (1N4007) in series with the resistor (10kΩ) and capacitor (100nF), as shown in the circuit diagram.
4. Solder the jumper wires to connect the components together.

Testing and Usage:

Once you have assembled the circuit, plug it into a USB port and connect an 18650 battery to the JST-XH connector. The TP4056 module will automatically start charging the battery.

Note that this charger is designed for 18650 batteries only, and should not be used with other types of batteries.

Tips and Variations:

• Use a different type of battery holder, such as a AA or AAA holder, if you want to charge other types of batteries.
• Add an LED indicator to show when the battery is fully charged.
• Use a higher current rating for faster charging (up to 2A).

• Arduino Uno or compatible board
• LM317 voltage regulator IC
• 1N4007 diode
• 10kΩ and 22kΩ resistors
• 100nF capacitor
• Breadboard and jumper wires
• 18650 battery holder and batteries

1. The Arduino microcontroller is used to regulate the charging process.
2. The LM317 IC acts as a voltage regulator, providing a stable output voltage.
3. The 1N4007 diode protects the circuit from reverse polarity and backflow current.
4. The resistors (10kΩ and 22kΩ) form a voltage divider network to set the desired charging voltage.
5. The capacitor (100nF) filters out any noise or ripples in the output voltage.

#include <Arduino.h>

const int chargePin = 2;
const int batteryVoltagePin = A0;
const int chargingVoltage = 4.2; // adjust to desired voltage

void setup() {
  pinMode(chargePin, OUTPUT);
  pinMode(batteryVoltagePin, INPUT);
}

void loop() {
  int batteryVoltage = analogRead(batteryVoltagePin) * (5.0 / 1023.0);
  if (batteryVoltage < chargingVoltage) {
    digitalWrite(chargePin, HIGH);
  } else {
    digitalWrite(chargePin, LOW);
  }
  delay(1000); // adjust to desired interval
}

1. Assemble the circuit on a breadboard or PCB.
2. Connect the Arduino board to a computer via USB cable.
3. Upload the provided code to the Arduino board.
4. Insert an 18650 battery into the holder and connect it to the charger.
5. Monitor the charging process using a multimeter or serial console.