This article will explain how to make a 3-string 12V battery pack using 1800mAh 18650 lithium batteries. We will detail each step to ensure you can easily complete the assembly.
Materials Needed
Three 1800mAh 18650 lithium batteries
Nickel strips
Hot glue gun
Lithium battery protection circuit board
Soldering iron and solder
Step 1: Identify Battery Terminals
First, identify the positive and negative terminals of each battery. 18650 lithium batteries usually have markings indicating the positive and negative terminals. Ensure these markings are visible for easy reference in the following steps.
Step 2: Arrange Batteries in Series
Next, arrange the batteries in a series connection as follows:
Place the first battery with its positive terminal facing up.
Invert the second battery, so its negative terminal is facing up.
Place the third battery with its positive terminal facing up.
This arrangement creates a series connection.
Step 3: Secure the Batteries
Use hot glue to secure the batteries together, ensuring they are neatly aligned and will not move. The hot glue will increase the stability of the battery pack, making the subsequent soldering process easier.
Step 4: Connect the Batteries
Connect the positive and negative terminals of the batteries using nickel strips as follows:
Solder a nickel strip between the positive terminal of the first battery and the negative terminal of the second battery.
Solder a nickel strip between the positive terminal of the second battery and the negative terminal of the third battery.
Solder two nickel strips underneath the batteries in the same manner.
Note: Ensure a steady hand while soldering to avoid short circuits or damaging the batteries.
Step 5: Mark Battery Voltage Points
To identify the voltage points of the battery pack, mark them as follows:
The first nickel strip corresponds to the 3.7V point.
The second nickel strip corresponds to the 7.4V point.
Finally, the third nickel strip corresponds to the 11.1V point, which serves as our 12V output terminal.
Step 6: Connect the Lithium Battery Protection Circuit Board
To ensure safe use of the battery pack, connect the lithium battery protection circuit board as follows:
Solder the 3.7V terminal of the protection board to the 3.7V nickel strip.
Solder the 7.4V terminal of the protection board to the 7.4V nickel strip.
Solder the B- B-terminal of the protection board to the 0V terminal.
Solder the 11.1V terminal of the protection board to the 12V terminal.
Upon completing these connections, you will have a 12V battery pack ready for use. This battery pack can be used in various electronic devices, providing a stable power supply.
By following these steps, we have successfully make a 12V lithium battery pack. We hope this guide helps you complete your battery pack assembly smoothly. If you encounter any issues during the process, feel free to leave a comment for discussion.