7S 24V 20A Lithium Battery Protection Board

The 7S 24V 20A Lithium Battery Protection Board (BMS) is a safety module designed to manage 7-cell Li-ion battery packs, providing essential protections such as overcharge, over-discharge, and overcurrent prevention. These boards typically support a continuous discharge current of 20A and often feature cell balancing to ensure all cells reach full charge simultaneously.

Key Specifications:

• Voltage Support: Designed for 7 series (7S) 3.6V/3.7V Li-ion batteries with a nominal voltage of 24V-25.9V and a full charge voltage of 29.4V.
• Current Ratings: 20A continuous discharge current with some models supporting peak/instantaneous currents up to 60A.
• Protection Thresholds:
  
  • Overcharge Detection: 4.25V ± 0.05V per cell.
  • Over-discharge Detection: 2.7V to 2.8V ± 0.05V per cell.
• Balancing Function: Most models include passive balancing with a balance current of roughly 40mA to 80mA, starting around 4.18V per cell.
• Thermal Management: Many boards use an aluminum heat sink or plate to improve MOS tube heat dissipation.

Common Applications:

These boards are frequently used in medium-power 24V systems, including:

• Electric Vehicles: E-bikes, scooters, and wheelchairs.
• Energy Storage: Small solar power systems and UPS battery packs.
• Power Tools: DIY battery pack repairs or custom-built power tools.