7.4V Lithium Battery Charger Circuit copy copy

1 year ago 704
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

In this project we will build a Two Stage Lithium Battery charger (CC and CV) that could be used as to charge Lithium ion or lithium polymer batters. The battery charger circuit is designed for 7.4V lithium battery pack (two 18650 in Series) 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.

It is using LM317 and Arduino, charge current 800mA (CC) and charge voltage 8.4 (CV).

A detailed tutorial for this circuit and PCB design is given on the following link: https://circuitdigest.com/microcontroller-projects/two-step-lithium-battery-charger-circuit-with-cc-cv-mode

Documents

Sheet_1 copy copy

7.4V Arduino PCB copy copy

BOM

ID Name Designator Footprint Quantity Mounted
1 LM317TG CONSTANT_CURRENT,CONSTANT_VOLTAGE TO-220(TO-220-3) 2 Yes C89320
2 1.5R 1W R1 10W 1 Yes
3 3.3k R3 AXIAL-0.3 1 Yes
4 560R R2 AXIAL 0.3/0.8/1.5 1 Yes
5 spdt 12v relay U5,U1 5 PIN SPDT RELAY 2 Yes
6 DC JACK IN_+12V DC JACK (123) 1 Yes
7 1N4007 D2,D1 DO-41 2 Yes
8 BC547B Tube Q1,Q2 TO-92(TO-92-3) 2 Yes C2092
9 1k R5,R4,R8 AXIAL-0.3 3 Yes
10 Battery_terminal P1 HDR-1X2/2.54 1 Yes C49661
11 1M R6,R7 AXIAL-0.3 2 Yes
12 2.2R 5W SHUNT 1W 1 Yes
13 NO U3 ARDUINO_NANO 1 Yes
14 10uf C1 CAP-D3.0XF1.5 1 Yes
15 LCD U4 LCD 1 Yes
16 10k R9 TRIMPOT 1 Yes C125022

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