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Introduction and Project Planning
For this simple project, I want to create a USB power bank, utilising some 18650 Li-ion batteries I have lying around from previous, smaller power banks. I want to combine these batteries to create a larger, high capacity power bank that I can take to college and work. I want the power bank to be able to charge my phone fully and have a compact design for portability. This project shouldn’t take much to develop and I already have the components on hand to create the power bank.
Analysis and Specification
Project Design and Project Development
The power bank will be charged via a USB cable, the module I have chosen to use is an all in one module with a charging circuit with overvoltage protection. Also, this module has the ability to output 5V boosted up from the 3.7V lithium batteries, this will be perfect for charging mobile phones and other 5V devices.
The circuit schematic for this project is incredibly simple. I simply need to connect both lithium cells to my all in one lithium charging / boost module. This module will control the charging of the module, with protections etc, and the boosting of the battery voltage to 5V, so it can power phones and other 5V devices. I used a new software package to design this schematic, Fritzing. This software is open source and runs as a portable application, it’s fantastic. However, it didn’t have a schematic icon for my lithium charging module, so as a placeholder I used a generic USB icon and a generic module icon, which should represent the connection justs fine.
Implementation and Testing
18650 Battery: http://img.dxcdn.com/productimages/sku_408231_1.jpg