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STD 7.4V Lithium Battery Charger Circuit
7.4V Lithium Battery Charger Circuit
License
GPL 3.0
License: GPL 3.0Mode:
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Update time：
2021-07-20 10:54:21
Creation time：
2018-12-13 06:48:23
Description
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).
For the complete circuit and pcb design tutorial, visit [circuitdigest.com](https://circuitdigest.com/microcontroller-projects/two-step-lithium-battery-charger-circuit-with-cc-cv-mode)
Design Drawing
Design Drawing
schematic diagram
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| 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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