BMS 8S-40A — Battery Management System

Overview:
The BMS 8S-40A is a Battery Management System designed to manage and protect 8-series lithium battery packs. It supports up to 40A continuous current and offers critical protections and cell balancing for safety and performance.

Specifications

• Cell Configuration: 8S (8 cells in series)

• Supported Battery Types: Li-ion (3.6–4.2V per cell), LiFePO₄ (3.2–3.6V per cell)

• Nominal Voltage: ~25.6V (LiFePO₄), ~29.6V (Li-ion)

• Maximum Continuous Current: 40A

• Peak Current (short duration): 60A–80A (varies by model)

• Balancing Type: Passive or Active (model dependent)

• Balancing Current: ~42mA to 200mA

• Protections:

  • Over-voltage

  • Under-voltage

  • Over-current

  • Short-circuit

  • Over-temperature and under-temperature

• Communication Interfaces (optional): Bluetooth, UART, RS485, CAN

• Operating Temperature: -20°C to +70°C

Features

• Real-time monitoring of each cell’s voltage

• Automatic charge/discharge protection

• Cell voltage balancing during charging

• Compact and efficient circuit design

• Optional external communication modules

Applications

• Electric bicycles and scooters

• Solar energy storage systems

• Portable battery banks

• DIY lithium battery packs

• Backup power solutions

Important Notes

• Always match the BMS to the correct battery chemistry and voltage.

• Ensure proper wiring of balance leads and main terminals.

• Heat dissipation may be needed at high currents.

• Use caution during installation—incorrect setup can damage batteries or cause safety hazards.