A BMS or protection board is any electronic control circuit that monitors, manages, and regulates the charging and discharging of any rechargeable battery (cell or combination of cell called battery). The lithium-ion batteries can be used only in specified conditions called safe operating area, and therefore BMS is necessary in order to monitor battery state, ensure safety of operation, long battery life. The battery characteristics to be monitored includes its state of charge, safe operating area, voltage, current, temperature, individual cell voltage, battery capacity and many more. The main task of battery management systems is to ensure the optimal use of the residual energy present in a battery. In order to avoid loading of batteries, BMS protects the battery from:

• Deep discharge due to extreme high discharge current.
• Over-voltage due to extreme fast charge.
• Cell balancing in the case of multi-cell batteries by monitoring and regulating the charging and discharging of individual cells.
• High Temperature
• Short circuit of external load.

Protection:

This BMS offers below mentioned protection of utmost importance.

• Overcharge Protection
• Temperature Sensor Protection
• Over discharge Protection
• Short Circuit Protection
• Overcurrent Protection
• Cell Balancing Function

Wiring Diagram:

Specifications:

1. Charge Voltage (V): 4.2 * N
2. Charge Current Threshold (A): 20
3. Discharge Current Threshold (A): 20
4. Pulsed Discharge Current (A) (5 Sec): 200
5. Overcharge Detection Voltage per Cell (V): 4.2 ± 0.05
6. Overcharge Release Voltage Per Cell (V): 4.15 ± 0.05
7. Over-discharge Detection Voltage (V): 2.80 ± 0.05
8. Over-discharge Release Voltage (V): 3.00 ± 0.05
9. Overcharge Voltage Protection Delay Time (ms): 600 - 1400
10. Over discharge Voltage Protection Delay Time (ms): 200 - 600
11. Overcharge Current Protection Delay Time (ms): 100 - 600
12. Temperature Protection (Load Cut Off) ( °C): 70
13. Working Temperature Range ( °C): -65 to 65
14. Storage Temperature Range ( °C): 20 - 45
15. Sleep Current (when Over Discharged) (µA): <100
16. Cell Balancing Function: Yes
17. Cell Balancing Method: Passive
18. Bleed Start Point / Cell Balance Voltage (V): 4.100 ± 0.05
19. Bleed Current / Balance Current (mA): 40 - 45
20. Load Short Circuit Protection: Yes Load Cut Off

Applications:

This protection board is widely used in all kinds of 18650 Li-ion battery packs and offers multi-scenario application.

• Electric tools
• Electric Vehicle
• E-Bicycle / E-Scooter/Bike
• Electric Club Car
• Battery backup systems
• Digital Battery
• Solar/Wind energy storage systems
• Solar street lamps

Package Includes:

1 set of 7S 25.9V 20A BMS for Lithium Ion NMC Battery