JBD 7S-14S 24V/36V/48V 20A-50A Smart BMS for LiFePO4 & NMC Li-ion with Bluetooth & Auto Cell Detection (E-Bike Battery)

Product Description

The JBD-SP14S004 Smart BMS is a software-based Battery Management System designed for 7–14 series LiFePo4 and  lithium-ion (NMC) battery packs. This model supports 20–50A continuous current and is optimized for compact power applications such as e-bikes, electric scooters, and small energy storage systems.

Key Features

• Supports 7–14S LiFePo4 and Li-ion (NMC) battery packs
• 20–50A continuous charge/discharge current
• Common port design (charge & discharge shared)
• UART communication (standard)
• Built-in Bluetooth monitoring (standard)
• Passive cell balancing function
• Automatic cell detection
• Temperature protection with 1 internal + 1 external NTC
• Sleep mode with ultra-low power consumption
• SOC capacity calculation and cycle counting

Protection Functions

• Over-charge protection & recovery
• Over-discharge protection & recovery
• Charge/discharge over-current protection
• Short circuit protection
• High/low temperature protection for charging and discharging
• FET over-temperature protection
• Automatic recovery with protection lock after repeated faults

Technical Parameters

• Cell type: 3.7v Li-ion (NMC) / 3.2v Lifepo4 Battery
• Cell configuration: 7–14S
• Charge voltage: 4.2V per cell / 3.6V per cell
• Cell voltage range: 2.8V – 4.25V / 2.3V–3.75V
• Continuous current: ≤50A
• Power consumption:
  • Operating: ≤10mA
  • Sleep: ≤1.5mA
  • Shutdown: ≤50μA
• Circuit resistance: ≤10mΩ
• Operating temperature: -20°C ~ 75°C
• PCB size: 63 × 52 × 14 mm

• Continuous current 20A,peak 60A continue 1s.

  Continuous current 30A,peak 90A continue 1s.

  Continuous current 40A,peak 120A continue 1s.

  Continuous current 50A,peak 150A continue 1s.

Communication & Interface

• UART communication (9600 baud rate)
• Bluetooth module support (optional)
• 15-pin voltage detection harness
• NTC temperature sensor interface
• Optional switch control and LCD display support
• One-wire communication (optional)

Applications

• Electric bicycles (e-bike)
• Electric scooters
• Light electric vehicles
• Portable power systems
• Small lithium battery packs
• Three-wheeled vehicles
• DIY lithium battery packs
• Backup power systems

Advantages

The SP14S004 combines high accuracy protection, stable performance, and flexible software configuration, making it suitable for OEM/ODM customization projects. It ensures safe operation of lithium battery packs under various working conditions.