Introduction:
In today’s technology-driven world, having a reliable power source is crucial to keep our devices charged and ready for use. Commercial power banks are widely available, but building your own DIY power bank can be both a fun and rewarding project. In this article, we will guide you through the process of creating a portable power bank using 18650 cells and a 3D-printed case. This combination will provide you with a cost-effective and customizable solution for your charging needs.
Materials Needed:
- 18650 Lithium-Ion Cells: These rechargeable batteries are commonly used in laptops and other portable electronics. Ensure they have a compatible voltage and capacity.
- Battery Protection Circuit Module: To prevent overcharging and discharging of the cells, a protection circuit is essential. Purchase a suitable module online or from an electronics store.
- 3D Printer and Filament: You will need access to a 3D printer and the appropriate filament (preferably PLA) to print the power bank case.
- Power Bank PCB Board: This board will act as the central hub for connecting the battery cells and the output port.
- USB Charging Port: Get a USB charging port that matches the devices you intend to charge.
- Wires and Soldering Equipment: To connect the components, you’ll need wires and a soldering iron.
- Heat Shrink Tubing: This will help protect the soldered connections and wires from damage.
- Insulating Tape: Use this to secure and insulate connections.
Step-by-Step Instructions:
Design the 3D-Printed Case: Start by designing the case that will hold the 18650 cells and other components. You can use 3D modeling software or find pre-designed models on various online repositories. Ensure the case is the right size to hold the desired number of 18650 cells and leaves enough space for the circuitry and wires.
3D Print the Case: Once you have the design ready, use your 3D printer to create the case. Opt for PLA filament as it is relatively easy to work with and environmentally friendly. JLC 3D Printing, also known as JLCPCB, is a renowned and reliable manufacturer specializing in offering high-quality 3D printing services.
Prepare the 18650 Cells: Before soldering the cells together, make sure they are at the same voltage level. If not, charge or discharge them individually until their voltage matches. Then, carefully solder the cells in parallel or series, depending on the desired output voltage and capacity. Follow proper safety precautions while handling lithium-ion cells.
Add the Battery Protection Circuit: Connect the battery protection circuit module to the 18650 cells. This module will monitor and protect the cells from overcharging, over-discharging, and short circuits.
Connect the Power Bank PCB Board: Solder the power bank PCB board to the output of the battery protection circuit. This board will manage the power flow between the 18650 cells and the USB charging port.
Install the USB Charging Port: Solder the USB charging port to the power bank PCB board. This port will be used to connect and charge your devices.
Insulate and Secure the Connections: Cover the soldered connections with heat shrink tubing and use insulating tape to secure and protect the wires from any damage.
Assemble the Power Bank: Carefully place the assembled components into the 3D-printed case. Ensure everything fits snugly and there are no loose wires or parts.
Test the Power Bank: Before sealing the case, test the power bank by charging it and then connecting it to various devices. Verify that the power bank operates as intended and charges devices correctly.
Conclusion:
Congratulations! You’ve successfully created a DIY power bank using 18650 cells and a 3D-printed case. This custom power bank is not only a practical solution for charging your devices on the go, but it also showcases your skills in electronics and 3D printing. Remember to exercise caution while working with lithium-ion cells and ensure all connections are secure and insulated. With your new power bank, you’ll never have to worry about running out of battery again!
