Lithium Battery Charger Protection Module (BMS) 3S 20A 12.6V

Lithium Battery Charger Protection Module (BMS) 3S 20A 12.6V

This module is a specialized 3-cell lithium battery protection board, engineered to act as an intelligent guardian for 12.6V battery packs. Its primary role is to continuously monitor the voltage of each individual cell within the series, as well as the overall current flow. By doing so, it ensures the battery operates within a safe electrical envelope, proactively preventing conditions that can lead to permanent damage or hazardous situations, thereby significantly enhancing the safety and longevity of the power source.

The board’s fundamental operation is based on a sophisticated protection circuit that automatically intervenes during abnormal conditions. It is designed to instantly cut off power if it detects an overcharge, over-discharge, or over-current event. This crucial function prevents the battery cells from being stressed beyond their limits, which can cause degradation or even thermal runaway. The inclusion of an auto-recovery feature means the system can automatically resume normal operation once the fault condition is removed and parameters return to a safe range, improving usability.

This BMS is built with a practical understanding of real-world applications, particularly for powering devices like electric motors. It emphasizes the importance of a proper setup, including using batteries with sufficient discharge rates and adequate wire thickness to handle the load. The design acknowledges thermal management, advising on load reduction if the heat dissipation is insufficient. Ultimately, it serves as a reliable, automated sentinel that manages the complex interplay between the battery, charger, and load to deliver stable and protected power.

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 :

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.

Package Contents:

• 1x Lithium Battery Charger Protection Module (BMS) 3S 20A 12.6V

Datasheet