7S 50A BMS Lithium Battery Protection Board with UART/485 Communication

The 7S 50A BMS (Battery Management System) with UART/485 Communication is designed for 7-series (7S) lithium-ion battery packs, where seven cells are connected in series, producing a nominal voltage of approximately 25.2V. This type of BMS provides advanced protection and management features for high-current applications, as well as communication capabilities via UART/485, enabling remote monitoring and control of battery performance. It is ideal for larger battery packs in systems such as e-bikes, solar energy storage, or electric vehicles.

Key Features:
1. 7S Configuration:
Supports 7-series lithium-ion batteries (such as 18650, LiFePO4, or Li-ion cells), with a total voltage range of approximately 21V to 29.4V (25.2V nominal).
2. 50A Continuous Current:
Handles a 50A continuous discharge current, suitable for high-power applications like electric bikes, scooters, power tools, or solar energy systems.
Some models may also support higher peak currents for short durations.
3. Advanced Protection Features:
Overcharge Protection: Prevents charging beyond the safe voltage limit (typically 4.2V per cell, or 29.4V total for 7S configuration).
Over-discharge Protection: Stops discharging when the voltage drops below the safe threshold (typically 2.5V per cell, or 17.5V total for 7S).
Short-Circuit Protection: Automatically shuts down the system in case of a short circuit, preventing damage to the battery and the connected load.
Overcurrent Protection: Protects the battery pack from excessive current draw, which could lead to overheating or damage.
Thermal Protection: Monitors the temperature and disconnects the load or charger if the battery pack overheats.
4. Balance Charging:
Ensures that all 7 cells in the series are charged equally, preventing overcharging of one cell while others undercharge. This improves the battery pack’s efficiency and lifespan.
5. Communication Interface:
UART/485 Communication: These protocols allow real-time communication between the BMS and external devices (like microcontrollers, computers, or monitoring systems), enabling remote monitoring and management of the battery pack.
UART (Universal Asynchronous Receiver-Transmitter): A serial communication protocol often used for direct device-to-device communication.
RS-485 (485 Communication): A more robust communication standard, used for long-distance or industrial applications where interference might be an issue.
This feature is useful for data logging, remote diagnostics, or integrating the BMS into larger control systems (such as smart battery systems for solar energy or electric vehicles).
6. LED Display/Alerts (Optional):
Some models may include a display for real-time monitoring of voltage, current, temperature, and other battery parameters, or they may provide alerts for faults like overcurrent or short circuits.
Technical Specifications:
Battery Type: 7S Lithium-ion, LiFePO4, or similar cells.
Input Voltage: Around 25.2V (nominal for 7S) with a fully charged voltage of 29.4V.
Overcharge Voltage: Typically 4.2V per cell (29.4V total for 7S).
Over-discharge Voltage: Approximately 2.5V per cell (17.5V total for 7S).
Max Continuous Current: 50A.
Peak Current: May support brief surges beyond 50A depending on the model.
Communication: UART and RS-485 for monitoring and remote control.
Balance Current: Often ranges between 30mA to 100mA, ensuring gradual balancing during charging.

Common Applications:
Electric Bikes (e-Bikes): Provides a reliable power management solution for high-capacity battery packs in e-bikes or e-scooters, ensuring that they run safely and efficiently under various load conditions.
Solar Power Storage: Ideal for home or small-scale solar energy systems, where large battery packs store excess energy generated from solar panels. The communication features are useful for monitoring battery health and performance.
Electric Vehicles (EVs): Useful in small EV projects or prototypes, ensuring efficient battery usage, protecting the cells, and facilitating remote monitoring of the battery system.
Power Tools and Industrial Equipment: Suitable for powering high-drain devices like electric drills, saws, or other industrial tools that rely on robust battery packs with reliable power management.
Backup Power Systems: Can be integrated into UPS (Uninterruptible Power Supplies) or backup power units, providing stable power management with the ability to monitor battery performance and health.

Benefits:
Enhanced Battery Safety: Comprehensive protection features (overcharge, over-discharge, short-circuit, and overcurrent protection) ensure the safety and longevity of the battery pack.
Remote Monitoring and Control: The inclusion of UART/RS-485 communication enables real-time monitoring, making it suitable for large-scale systems where battery management is crucial.
Improved Battery Lifespan: Balance charging and over-discharge protection ensure that the battery cells charge and discharge evenly, maximizing their life cycle.
High Power Output: With a 50A discharge current, the BMS can handle power-hungry applications like electric vehicles or heavy-duty tools.

Important Considerations:
Installation and Wiring:
Proper installation is critical for safe operation. Ensure correct wiring between the B+, B-, P+, P-, and communication terminals. Miswiring can result in malfunction or damage.
Communication Setup:
The UART/RS-485 communication may require specific software or hardware for monitoring. Ensure that your system is compatible with these communication protocols.
Battery Matching:
Ensure the battery cells are properly matched in terms of capacity, internal resistance, and charge cycles to prevent imbalances that could affect the BMS’s performance.

What’s in the box
1 x 7S 50A BMS Lithium Battery Protection Board