Battery Charger Protection
The 3S 20A Lithium Battery Charger Protection Module (BMS) is engineered to protect and manage 3-cell lithium-ion battery packs. It supports batteries with nominal voltages of 3.6V or 3.7V, including 18650, 26650, and polymer lithium batteries.
This module ensures safe operation with features like overcharge, over-discharge, overcurrent, and short circuit protection, along with cell balancing to maintain equal charge across cells.
With a charging voltage of 12.6V and a continuous discharge current of up to 20A, it’s ideal for applications such as power tools, LED lights, and low-power inverters.
Features :
- Overcharge Protection: Prevents cells from exceeding safe voltage levels, enhancing battery lifespan.
- Over-discharge Protection: Stops discharge when cells drop too low, preventing damage.
- Over-current Protection: Limits current to protect against excessive loads.
- Short Circuit Protection: Disconnects the battery in case of a short circuit for safety.
- Cell Balancing: Ensures all cells charge evenly, improving efficiency and longevity.
- Auto Recovery: Resumes normal operation after a protection event is resolved.
- Low Quiescent Current: Minimizes power consumption when idle.
Specifications :
| Parameter | Value |
|---|---|
| Cell Configuration | 3 series (3S) |
| Nominal Voltage | 11.1V |
| Fully Charged Voltage | 12.6V |
| Charging Voltage | 12.6V – 13.0V |
| Continuous Discharge Current | 20A |
| Continuous Charge Current | 10A |
| Overcharge Protection Voltage | 4.25V ± 0.05V per cell |
| Over-discharge Protection Voltage | 2.7V ± 0.1V per cell |
| Balance Detect Voltage | 4.18V |
| Balance Current | 30 ± 5 mA |
| Overcurrent Protection (Discharge) | 60 ± 10 A |
| Short Circuit Protection | Yes |
| Internal Resistance | <20 mΩ |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -40°C to +80°C |
| Dimensions | 59mm x 20mm x 3.4mm |
| Weight | 4.3g |
Applications :
- Power Tools: Drills, sprayers, and other tools requiring reliable power.
- LED Lighting Systems: Backup or primary power for efficient lighting.
- Low-Power Inverters: For small-scale power conversion needs.
- Consumer Electronics Battery Packs: Custom or replacement packs for devices.
- Solar Street Lights: Managing battery storage for nighttime operation.
- Monitoring Systems: Powering remote or standby monitoring equipment.
- Vacuum Cleaners: Battery management for cordless models.
Precautions and Usage Guidelines :
To ensure optimal performance and safety, consider the following:
- Proper Wiring: Connect terminals correctly: 0V (B-), 3.7V (B1), 7.4V (B2), 11.1V (B+). Incorrect wiring can damage the module.
- Initial Charging: Charge the battery pack after connection to activate the BMS.
- Battery Compatibility: Avoid mixing batteries with different capacities or charge states to prevent imbalance.
- Wire Sizing: Use wires of at least 2.5mm² for high-current applications to handle the load safely.
- Cooling Considerations: Reduce load current in poor cooling environments to prevent overheating.
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