Lithium Polymer Battery Charger Circuit

Lithium ion polymer batteries are extremely power dense.

Lithium polymer battery charger circuit.

Fully charging a battery can take from 2 to 4 hours depending of the charge rate which i recommend to keep between 0 5 and 0 7c. However they are not safe batteries and require extra care. In this project we will build a two stage battery charger cc and cv that could be used as to charge lithium ion or lithium polymer batters. Get it as soon as fri sep 25.

The battery charger circuit is designed for 7 4v lithium battery pack two 18650 in series which i commonly use in most robotics project but the circuit can be easily modified to fit in lower or slightly higher battery packs like to build 3 7 lithium battery charger or 12v lithium ion battery charger. Get it as soon as thu sep 17. The tp4056 ic is a complete constant current constant voltage linear charger for single cell lithium ion lithium polymer liion lipo batteries. The following li ion battery charger circuit very efficiently follows the above conditions such that the connected battery is never allowed to exceed its over charge limit.

Li ion battery charging follows a profile designed to ensure safety and long life without compromising performance figure 2. Here is a tried and tested sample circuit of a li ion battery charger that can be used to charge any 3 7v li ion battery using a 5vdc usb solar panel power supply. A lithium polymer battery or simply a lipo battery is an advanced breed of the more popular lithium ion battery and just like it s older counterpart is specified with stringent charging and discharging parameters. 4 6 out of 5 stars 14.

When the ic 555 is used as a comparator its pin 2 and pin 6 become effective sensing inputs for detecting the lower and the upper voltage threshold limits depending upon the setting of the relevant presets. 4 4 out of 5 stars 22. More buying choices 6 36 2 used new offers. When the current flowing into the battery is less than 3 10 of the nominal capacity the battery is 100 charged and the circuit above is what will tell us when this happens.

Its sop 8 package and low external component count make the tp4056 ideally suited for portable applications. Charging or using the batteries incorrectly can cause explosion or fire as shown by this and many other youtube videos. If a li ion battery is deeply discharged for example to below 3 v a small pre conditioning charge of around 10 of the full charge current is applied. This makes them great for reducing size and weight of projects.

Free shipping on your first order shipped by amazon. At the heart of the circuit is one microchip mcp73831 available in sot 23 5 package.