Original 3S 40A BMS 11.1V 12.6V 18650 Lithium Battery Protection with 100mA Balancing Feature 3S 40 Ampere BMS

Description

A 3s 40a BMS (Battery Management System) is a protection circuit board for a lithium-ion battery pack with three cells in series (3S) and a maximum continuous discharge current of 40 amps. It protects the battery pack from overcharging, over-discharging, and overcurrent conditions, ensuring safety and extending battery life. It also features cell balancing, which helps maintain equal charge levels across all cells for optimal performance. This specific BMS is designed for 3.7V lithium-ion cells, such as those in 18650 battery packs, and is commonly used in applications like electric drills, LED lights, and low-power inverters.
Key Features & Specifications:
Series Cells (3S):
For battery packs with three cells connected in series, resulting in a nominal voltage around 11.1V and a full charge voltage of 12.6V.
Current Rating (40A):
Provides a continuous discharge current of up to 40 amps. It often has a higher peak or instantaneous current rating as well.
Protection Functions:
Includes protection against:
Overcharging: Prevents damage from overcharging at high voltages.
Over-discharging: Stops discharge at a safe low-voltage limit.
Overcurrent: Protects against excessive current draw.
Short-circuit: Safeguards against sudden, high-current electrical faults.
Cell Balancing:
Actively equalizes the voltage of individual cells, promoting better overall battery health and performance.
Automatic Recovery:
Some models may include an automatic recovery function, where the BMS restores operation after a fault condition is resolved.
Application:
Suitable for various low-power devices and projects, including:
Electric drills and other small motors.
LED lights.
Low-power inverters and standby power systems.
How it Works:
The BMS monitors the voltage, current, and temperature of the battery pack. When it detects a potentially harmful condition, such as a cell reaching a critical voltage or current level, it disconnects the battery to prevent damage. The balancing function works during charging to ensure all cells are equally charged.