battery Management system

EC BMS 21-32S

High-performance 21S-32S BMS features modular design, aluminum power boards, premium MOSFETs, copper conductors, efficient thermal management, triple peak current, dual NTC sensors, deep sleep and multi-level protection.

check_circle Suitable for demanding applications.
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Product Specifications

Parameter Value
Battery Series 3-32S
Continuous Current 200-300A
Dimensions 200A-300A: 10 × 21 × 2.5 cm
Battery Chemistry LTO (2.8V), LFP / LiFePO4 (3.7V), NMC / NCA (4.2V); customizable for sodium-ion and solid-state batteries
Detection Accuracy mV-level voltage detection and mA-level current detection
Protection Response Time Millisecond-level (ms)
Event & Warning Records Up to 400 rolling records for reviewing historical protection events and trigger causes
Bluetooth Supports iOS and Android
APP Supports 14 languages; displays battery voltage, temperature, current, capacity and other detailed data with configurable settings
Standard Configuration Packaging Box + Sampling Wires + Buzzer
Sleep Mode Manual / Automatic / Deep Sleep with 0 Power Consumption
Heating Function Supported across the full series
Activation Activates upon initial power-up; supports charging activation and load activation after sleep
Balancing 0.3A Passive Balancing
Peak / Instantaneous Current 3 × Continuous Current
MOSFET Breakdown Voltage 150V
Display Expansion Supports 2.0-inch and 4.3-inch displays
Inverter Communication Supported
GPS / 4G Expansion Supported
Remote Connectivity Supports GPS tracking and 2G / 3G / 4G networks; Wi-Fi module expansion supported in future versions

Protection & Smart Functions

  • Overcharge and over-discharge voltage protection
  • High-temperature and low-temperature protection
  • Overcurrent and short-circuit protection
  • Protection is triggered when preset threshold values are exceeded
  • Two-level configurable protection parameters for voltage, current and temperature
  • Millisecond-level protection response
  • Up to 400 rolling event and warning records for historical protection analysis
  • Manual and automatic sleep modes
  • Deep sleep mode with 0 power consumption
  • Heating function supported across the full series
  • Charging activation and load activation after sleep
  • 0.3A passive cell balancing
  • Bluetooth connectivity for iOS and Android
  • 14-language APP with real-time battery monitoring and parameter settings
  • Supports 2.0-inch and 4.3-inch display expansion
  • Supports inverter communication
  • Supports GPS tracking and 2G / 3G / 4G remote connectivity
  • Supports future wireless Wi-Fi module expansion

Main Applications

  • Electric bicycles
  • Electric tricycles
  • Electric scooters
  • Racing boats and other high-power marine applications
  • Sightseeing vehicles
  • Special-purpose electric vehicles
  • Construction and material-handling equipment
  • Electric forklifts
  • Not intended for engine-starting battery applications

Core Technology


  • Modular Design

    Combines a management board, power board, and pin-contact communication interface, allowing individual damaged modules to be replaced without replacing the entire BMS.

  • Universal Series Design

    Board size is determined by continuous current rather than cell count, enabling broad series compatibility across the product range and reducing inventory pressure; dual NTC temperature sensors are standard.

  • Integrated Pre-Charge Module

    A standard pre-charge circuit limits inrush current when connecting loads or chargers, helping prevent false protection triggers and ensuring smooth load startup.

  • High-Quality MOSFETs

    High-quality MOSFETs provide controlled thermal performance, with 100V MOSFETs for 3–24S systems and 150V MOSFETs for 21–32S systems for improved voltage margin and circuit reliability.

  • Aluminum-Based Thermal Design

    The high-current section uses an aluminum-based power board, while higher-current models add aluminum heat-dissipation fins for rapid cooling and reduced heat transfer to battery cells.

  • High-Current Copper Busbar Design

    High-quality copper busbars with optimized thermal and stress-relief design provide reliable current handling and support peak currents up to 3× the rated continuous current.

  • Advanced Heat Dissipation Structure

    CPU-grade thermal conductive silicone, high-efficiency finned heat sinks, and separated control and power boards accelerate cooling and minimize heat transfer between circuits.

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