Description
The 4S 40A 18650 Battery Management System (BMS) with protection and balancing is designed to efficiently manage and safeguard 4-series (4S) lithium-ion battery packs, commonly built using 18650 cells. It ensures safe operation by balancing cell voltages, preventing overcharge, over-discharge, overcurrent, and short-circuit conditions. Compact, durable, and reliable, this BMS is perfect for high-power applications such as electric vehicles, power tools, and energy storage systems.
Key Features
- Supports 4-Series (4S) Lithium-Ion Packs: Designed for 18650 or similar Li-ion cells
- High Current Capacity: Supports up to 40A continuous discharge current
- Active Balancing: Maintains equal charge levels across all cells for maximum efficiency
- Comprehensive Protection:
- Overcharge protection
- Over-discharge protection
- Overcurrent and short-circuit protection
- Temperature protection for enhanced safety
- Efficient & Compact: Lightweight, space-saving design suitable for integration into battery packs
Specification
- Battery Configuration: 4S (4-series) lithium-ion
- Continuous Discharge Current: 40A
- Overcharge Protection Voltage: 4.25V ±0.05V per cell
- Overdischarge Protection Voltage: 2.8V ±0.05V per cell
- Balance Voltage: 4.2V ±0.05V per cell
- Balance Current: 30mA (typical)
- Overcurrent Protection: Activated at 60A ±5A
- Short-Circuit Protection: Yes
- Operating Temperature Range: -20°C to +60°C
- Dimensions / Weight: Varies by manufacturer
Application
- Electric Vehicles: Battery protection for e-bikes, e-scooters, and small EVs
- Power Tools: Ensures safe operation of high-current cordless tools
- Energy Storage Systems: Ideal for solar and renewable energy storage packs
- Portable Electronics: Suitable for high-capacity lithium-ion battery banks
Usage Instructions
- Connect the BMS to the battery pack following the manufacturer’s wiring diagram
- Ensure secure and insulated connections to prevent short circuits
- Install in a well-ventilated area to aid heat dissipation
- During initial operation, monitor temperature and cell voltages to confirm proper function
- Periodically inspect wiring and components for maintenance and safety
Caution
- Always follow the correct wiring sequence — incorrect connection can damage the BMS or battery pack
- Do not exceed rated current or voltage limits
- Avoid exposure to moisture, extreme heat, or physical damage
- Maintain good ventilation during high-load use