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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.
This PCB provides a simple yet reliable protection and monitoring solution for a single-cell Li-Ion battery.
The design includes:
The project was developed to demonstrate practical PCB design skills and follows good engineering documentation practices suitable for a hardware portfolio.
| 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) |
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:
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.
Battery
│
▼
PTC Fuse
│
▼
Schottky Diode
│
▼
BAT_OUT
├──► LED Indicator
└──► ADC Voltage Divider
docs/
gerbers/
images/
pcb/
references/
releases/
simulation/
See BOM.csv
This project is licensed under the MIT License.
See the LICENSE file for details.
Designed using KiCad 9 as part of a hardware engineering portfolio project demonstrating PCB design, documentation, and manufacturing preparation.
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