Build a 3-Core 3-Slot 18650 Charger with Power Bank DIY
If there If you possess several 4056 modules and a 5V voltage-boosting module, you have the capability to construct a versatile DIY charger with three independent charging slots.
Key Features:
1. Versatile and User-Friendly: This charger offers simplicity and versatility.
2. Multi-Slot Charging: It accommodates three 18650 batteries, each capable of individual charging.
3. Parallel Charging: By employing 4-pin jumpers, you can connect all three slots in parallel. The central slot corresponds to the middle 2-pin jumper, while the outer slots match the top and bottom jumpers.
4. Battery Protection: The charger includes safeguards against overcharge and overcurrent, thanks to the central 4056 board directly interfacing with the voltage-boost module.
5. Discharge Options: The two middle pins serve as discharge outputs for the central 18650 battery, routed through a protective board. You can discharge all three batteries in parallel from this point or independently discharge the central and outer batteries, effectively simulating two 18650 batteries.
6. Convenient Input Control: The jumpers at the bottom control the input to the voltage-boost module. A 90-degree rotation connects them, and under no load, they draw only around 140uA, making disconnection largely unnecessary. These jumpers are paralleled to minimize heat generation from high currents and ease jumper storage.
7. Voltage Boost Module: Supporting voltages as low as 2V and a maximum output current of 5V2A, this module's USB-A port operates without a protocol chip. When D+ and D- are bridged, it delivers a recognized 5V2A output.
8. Battery Compatibility: Depicted in the images are sodium-ion batteries with a charge/discharge voltage range of 2-4V. The 4056 module enforces a voltage limit of 4.2V. To safeguard against overcharge, an economical 2.8V lithium-ion cell is employed. The 4056 module appears to function optimally, maintaining a 4.16V voltage when unloaded.
9. Flexible Input Options: As the input ports of the 4056 modules are connected in parallel, you have the liberty to select either Micro USB or Type C. Each module can operate independently with a maximum current output of 1A, or they can be connected in parallel with the batteries, achieving a maximum charging current of 3A. Although multiple 4056 modules can be linked in parallel, the output may exhibit slight variations due to chip parameter disparities, causing LED indicators to activate at slightly different times.
10. Insulated Back Design: The reverse side features straightforward soldering and jumpers where necessary. To mitigate short-circuit risks, a PP insulation sheet, akin to those used in smartphone cases, is situated in the middle.
This comprehensive guide empowers you to create a high-functioning DIY charger with ease and precision. For further insights, troubleshooting tips, and step-by-step instructions, please refer to the accompanying images and documentation.
