2 layers60 × 30 mm
Controller
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
11 parts3kApache-2.0
2 layers90 × 40 mm
LiIon Battery Protection
imguxuuuu/Battery-Protection-PCB1Manufacturing-ready Li-Ion Battery Protection PCB designed using KiCad 9 with complete documentation, Gerber files, simulations, and manufacturing package.
- Size
- 90 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 6
- Pads
- 23
- Tracks, vias
- 23, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 24 Jul 2026
- Updated
- 30 Jul 2026
Overview
LiIon Battery Protection is an open-source printed circuit board by imguxuuuu, from the imguxuuuu/Battery-Protection-PCB repository on GitHub, published under the MIT licence. It is a 2-layer board of 90 × 40 mm with 11 parts on 6 nets, routed with 23 tracks and 0 vias.
Its parts include 3 resistors, 2 diodes, 1 capacitor, 1 connector and 1 fuse. It belongs with the power boards of this library.
README
README.md🔋 Li-Ion Battery Protection PCB
A compact single-cell (3.7 V) Li-Ion battery protection and voltage monitoring PCB designed using KiCad 9.
This project demonstrates the complete PCB design workflow, including schematic capture, PCB layout, routing, copper pour, design rule verification, Gerber generation, and manufacturing documentation.
📸 Project Banner
📖 Project Overview
This PCB provides a simple yet reliable protection and monitoring solution for a single-cell Li-Ion battery.
The design includes:
- Reverse-current protection
- Overcurrent protection
- Battery voltage sensing
- Power indication
- Test points
- Manufacturing-ready outputs
The project was developed to demonstrate practical PCB design skills and follows good engineering documentation practices suitable for a hardware portfolio.
✨ Features
- ✅ Reverse current protection using 1N5819 Schottky diode
- ✅ 500 mA resettable Polyfuse
- ✅ Battery voltage divider for MCU ADC
- ✅ 100 nF analog filter capacitor
- ✅ Green power indicator LED
- ✅ BAT_ADC and GND test points
- ✅ 90 mm × 40 mm PCB
- ✅ Ground copper pour
- ✅ Passed KiCad DRC (0 Errors)
- ✅ Manufacturing-ready Gerber files
📊 PCB Specifications
| Parameter | Value |
|---|---|
| Board Size | 90 mm × 40 mm |
| Layers | 2 |
| Copper Weight | 1 oz |
| Input Voltage | 3.0–4.2 V DC |
| Nominal Voltage | 3.7 V Li-Ion |
| Design Software | KiCad 9 |
| DRC Status | Passed (0 Errors) |
⚡ Circuit Overview
The battery output first passes through a 500 mA resettable Polyfuse, providing overcurrent protection.
The protected voltage is then routed through a 1N5819 Schottky diode, preventing reverse current flow.
The output powers:
- Output connector
- Power indicator LED
- Battery voltage monitoring circuit
Battery voltage is measured using a 100 kΩ / 100 kΩ resistor divider followed by a 100 nF RC filter, providing a stable analog voltage for a microcontroller ADC.
🔄 Functional Block Diagram
Battery
│
▼
PTC Fuse
│
▼
Schottky Diode
│
▼
BAT_OUT
├──► LED Indicator
└──► ADC Voltage Divider🖼️ Project Images
Schematic
PCB Top View
3D PCB View
Gerber Verification
📁 Repository Structure
docs/
gerbers/
images/
pcb/
references/
releases/
simulation/📋 Bill of Materials
See BOM.csv
✔ Verification
- ERC Completed
- DRC Passed (0 Errors)
- Copper Pour Verified
- Gerbers Verified
- Drill Files Generated
- Fabrication Package Prepared
🛠 Software Used
- KiCad 9
- KiCad Gerber Viewer
- LTspice XVII
- Git
- GitHub
🚀 Future Improvements
- DW01A Battery Protection IC
- USB Type-C Charging Circuit
- Reverse Polarity MOSFET Protection
- Battery Fuel Gauge
- JST Battery Connector
- Current Sense Amplifier
- TVS Surge Protection
- Mounting Holes
📚 Documentation
- Project Report
- Project Specification
- Design Decisions
- Manufacturing Notes
- Component Datasheets
- PCB Design Checklist
📄 License
This project is licensed under the MIT License.
See the LICENSE file for details.
⭐ Acknowledgements
Designed using KiCad 9 as part of a hardware engineering portfolio project demonstrating PCB design, documentation, and manufacturing preparation.
Parts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100k | Resistor_SMD:R_0805_2012Metric | R2, R3 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 1N5819 | Diode_SMD:D_SMA | D1 |
| 1 | 330 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 500mA PTC | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | BAT_ADC | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | BAT_OUT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | GND_TEST | TestPoint:TestPoint_Pad_D1.5mm | TP2 |
| 1 | Green | LED_SMD:LED_0805_2012Metric | LED1 |
| 1 | Li-Ion 3.7V | Battery:BatteryHolder_Keystone_1042_1x18650 | BT1 |
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Questions
How big is the LiIon Battery Protection PCB?
It measures 90 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LiIon Battery Protection use?
11 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the LiIon Battery Protection KiCad files?
From the imguxuuuu/Battery-Protection-PCB repository on GitHub, at the commit this page was made from: the board is pcb/LiIon_Battery_Protection/LiIon_Battery_Protection.kicad_pcb and its schematic pcb/LiIon_Battery_Protection/LiIon_Battery_Protection.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LiIon Battery Protection design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).