7S 25A 10 MOS BMS Lithium 18650 Battery Charge Board

7S 25A 10 MOS BMS Lithium 18650 Battery Charge Board provides a comprehensive protection and management solution for 24V Lithium-ion battery packs consisting of seven cells in series. This advanced Battery Management System (BMS) utilizes ten high-performance MOSFETs to handle a continuous discharge current of 25A while maintaining low internal resistance. Consequently, the board ensures efficient power delivery and prevents excessive heat buildup during high-load operations. It monitors each individual cell to protect against overcharging, over-discharging, and short circuits. Furthermore, the integrated balancing circuit ensures that all cells reach the same voltage level, which significantly extends the overall lifespan of your battery pack. Therefore, you can rely on this BMS for high-performance applications like electric scooters and power tools that demand high safety standards and longevity.

Key Features:

• 10 MOSFET Design: Incorporates ten low-resistance power MOSFETs to manage heat dissipation effectively while supporting high current throughput.
• Integrated Cell Balancing: Features a dedicated balancing circuit that redistributes charge among cells, ensuring uniform voltage across the entire 7S string.
• Comprehensive Protection: Provides hardware-level protection against over-voltage, under-voltage, over-current, and short-circuit conditions.
• High Current Capacity: Supports a continuous discharge current of 25A, making it suitable for medium-power motor and inverter applications.
• Robust Heat Sink: Often equipped with an aluminum plate or heat sink to maintain thermal stability during prolonged high-current discharge.

Technical Specifications:

• Battery Chemistry: Lithium-ion / Li-Polymer (3.7V Nominal per cell)
• Series Configuration: 7S (25.9V Nominal / 29.4V Fully Charged)
• Continuous Discharge Current: 25 A
• Instantaneous Discharge Current: 60 A
• Charging Voltage: 29.4 V
• Overcharge Detection: 4.25 V ± 0.05 V (Per cell)
• Over-discharge Detection: 2.55 V ± 0.08 V (Per cell)
• Balance Current: ≈ 30 mA to 50 mA
• Internal Resistance: ≤ 20 mΩ

Mechanical Specifications:

• Board Material: High-quality FR-4 Glass Fiber PCB
• MOSFET Type: N-Channel Power MOSFETs
• Cooling: Integrated Aluminum Thermal Plate
• Connection Type: Solder pads for battery leads and JST-type connector for balancing wires.

Dimensions:

• Length: ≈ 60 mm
• Width: ≈ 33 mm
• Thickness: ≈ 7 mm to 10 mm (including heat sink)
• Wire Length: ≈ 250 mm to 300 mm (Balance cable)

Pinout and Wiring:

• B- (Battery Negative): Connect this pad to the main negative terminal of the 7S battery pack.
• P- (Pack/Load Negative): Connect to the negative terminal of the charger and the negative terminal of the load.
• C- (Charge Negative): Often shared with P- on common port boards; connect to the charger negative.
• Balance Connector (B1 to B7): Connect these wires sequentially to the positive terminal of each cell in the series string, starting from the first cell’s positive (B1).
• B+ (Pack Positive): Connect the main positive load and charge wires directly to the positive terminal of the seventh cell.

Datasheet Reference:

• Download 7S 25A Lithium BMS Reference Guide

Commonly Used in:

• Electric Mobility: Providing power management for 24V electric bicycles, scooters, and wheelchairs.
• Portable Power Stations: Acting as the safety controller for DIY portable 24V lithium battery banks.
• Solar Storage: Managing small-scale 24V solar battery systems for off-grid lighting.

Applications:

• DIY Battery Packs: Building custom 18650 or 21700 packs for high-drain electronics.
• Robot Power Systems: Supplying steady current to motor drivers and controllers in robotics.
• Backup Power: Serving as the protection circuit for UPS systems or emergency medical equipment.

Equivalent Models:

• Daly 7S 24V 25A BMS: A popular alternative featuring a waterproof, sealed enclosure for harsh environments.
• Qucc 7S 25A Protection Board: A similar PCB-based BMS with comparable MOSFET counts and balance functionality.
• JBD 7S BMS: However, these often feature “smart” Bluetooth capabilities for app-based monitoring.

Package Includes:

• 1 x 7S 25A 10 MOS BMS Lithium 18650 Battery Charge Board
• 1 x 8-Pin Balance Cable (Wiring Harness)