3S 40A Li-ion Battery Management System (BMS)

Overview:
The 3S 40A Li-ion BMS is a reliable battery management solution designed for lithium-ion battery packs with 3 cells connected in series. It supports continuous discharge currents up to 40 amps and offers comprehensive protection features including overcharge, over-discharge, overcurrent, and short circuit protection. This BMS helps maintain battery health and safety through passive cell balancing.

Technical Specifications:

• Battery Type: Lithium-ion (Li-ion / NMC)

• Cell Configuration: 3S (3 cells in series)

• Nominal Voltage: 11.1V (3.7V × 3)

• Maximum Charge Voltage: 12.6V (4.2V × 3)

• Overcharge Protection: Approximately 4.25V per cell

• Over-discharge Protection: Approximately 2.8V per cell

• Continuous Discharge Current: 40A

• Overcurrent Protection: Typically 45A to 50A

• Short Circuit Protection: Yes, with automatic recovery

• Cell Balancing: Passive balancing included

• Balancing Current: 30–60 mA per cell

• Quiescent Current: Less than 50 µA

• PCB Format: Compact design for easy integration

• Operating Temperature Range: -20°C to +60°C

• Origin: Manufactured in China

Protection Features:

• Overcharge protection

• Over-discharge protection

• Overcurrent protection

• Short circuit protection

• Passive cell voltage balancing

Applications:

• 3S lithium-ion battery packs

• E-bikes and electric scooters

• Portable power banks

• Power tools

• Solar energy storage systems

• DIY electronics and robotics