Description

BMS 2S 13A 18650 7.4V-8.4V Lithium Battery Protection Board

 

A Battery Management System (BMS) for 2S 13A 18650 7.4V-8.4V lithium batteries is designed to protect and manage lithium-ion battery packs. Here’s a detailed description and the specifications of such a BMS:

Product Description:

• Type: Battery Management System (BMS)
• Configuration: 2S (2 series cells)
• Current Rating: 13A
• Voltage Range: 7.4V – 8.4V (nominal 7.4V, fully charged 8.4V)

Specifications:

1. Cell Configuration:
   • Series: 2 cells in series (2S)
   • Cell Type: 18650 lithium-ion
2. Electrical Ratings:
   • Charge Voltage: 8.4V (4.2V per cell)
   • Discharge Cut-off Voltage: Approximately 5.6V – 6V (2.8V – 3V per cell)
   • Charge Current: Maximum 13A
   • Discharge Current: Maximum 13A
3. Protection Features:
   • Overcharge Protection: Prevents overcharging of the battery cells
   • Over-discharge Protection: Prevents over-discharge of the battery cells
   • Overcurrent Protection: Protects against excessive current draw
   • Short-circuit Protection: Protects against short circuits
   • Temperature Protection: Monitors and manages temperature to prevent overheating (optional, depending on the BMS)
4. Balance Function: Some BMS boards include a balancing function to ensure each cell in the series has the same voltage.
5. Dimensions: Typically small and compact, suitable for integrating with the battery pack.
6. Connections:
   • B : Battery positive terminal
   • B-: Battery negative terminal
   • P : Pack positive terminal (to load/charger)
   • P-: Pack negative terminal (to load/charger)
   • BM: Middle connection between the two cells

Features:

• Overcharge Protection: Stops charging when the cell voltage exceeds 4.25V to prevent damage.
• Over-discharge Protection: Cuts off the circuit when the cell voltage drops below 2.8V to protect the battery.
• Overcurrent Protection: Limits the current to 13A to prevent overheating and potential damage.
• Short-circuit Protection: Instantly disconnects the battery to prevent damage in case of a short circuit.
• Balancing Function: Ensures equal charge and discharge across all cells, enhancing battery life and performance.

Applications:

• Power tools
• Electric bicycles and scooters
• RC toys and drones
• Portable electronics
• DIY battery packs