1. BMS1801 Introduction
Introducing the LiBat™ BMS1801, a compact battery management system meticulously crafted for high-end, compact lithium battery applications. This fully digital, standalone device is a ready-to-use solution designed for 5S-18S battery configurations. Once system parameters are appropriately set, the BMS1801 requires minimal ongoing user interaction. Serving as the sole electronic device for comprehensive battery system control and management, it is equipped with onboard power control and sensing options. This feature-rich device represents a seamless integration of advanced technology and user-friendly design, making it an optimal choice for a diverse range of lithium battery applications.
Key Features:
- Small design 101.5mm x 87.5mm
- Compact, plug-and-play BMS
- Built in 5S - 18S cell measurement with 0.1mV resolution
- 100A discharge, 50A charge current with FET controlled protection
- Built-in current sensor with external option
- Adjustable passive balancing current
- Deep sleep and low power consumption modes
- 1 x CANBus 2.0b, 2 x RS232, 2 x RS485
- 5 external, 2 internal NTC
- Configurable I/O, 2 logic output, 2 logic input, 2 O.D. output, 1 Relay Output
Table.1.1: BMS1801 Technical Specifications
| PARAMETER | SPECIFICATIONS |
|---|---|
| Power Source | Self or External Power. |
| Power Consumption | Power Down: ~0.050 mW , RUN State: ~1015mW |
| Wake Up Trigger | User Button / Charger Connection / Load Connection |
| LEDs | Power, Run/Error Status |
| Relay | 1x Relay Output |
| Inputs | 2x Button or Short Circuit Inputs, 1x User button with led |
| Outputs | 2x TTL Outputs(5V, 12v or External level selectable), 2x Open Drain Outputs |
| Precharge | Configurable Software Timer |
| DFU Mode | Embedded bootloader for firmware upgrades. |
| Digital Interface-1 | 1x Half Duplex RS485 |
| Digital Interface-2 | 2x RS232 |
| Digital Interface-3 | 1x CANBus 2.0b |
| Communication Protocols | LiBat COM, JSON |
| Communication Protocol | Modbus RTU |
| Current Sensor | On board, up to 100A continuos, 150A peak |
| Current Sensor(optional) | Compatiable with 5V external current sensors |
| Charge Current | Up to 50A (onboard FETs) |
| Discharge Current | Up to 100A (onboard FETs) |
| Number of cells | Up to 18 Cells. Minimum 15 V |
| Cell Type | Any battery cell in voltage range |
| Minimum cell voltage | 250 mV |
| Maximum cell voltage | 4500 mV |
| Accuracy of Cell Voltage Measurement | ±1.6mV typical, < ±8.3mV max. |
| Balance Method | Passive Balancing |
| Balance Current | 420mA @ 4.2Vdc cell voltage |
| Balance Power | 2W max. per cell |
| Temperature Sensor Type | NTC, 10KΩ @ 25 °C |
| Temperature Sensor Accuracy | ±1.5 °C (depends on sensor sensitivity) |
| Number of Temperature Sensor | Up to 5 external sensor probes, 2x On board NTC |
| Operating Temperature | -20 °C to +70 °C (-4° F to +158° F) |
| Relative Humidity | 5% to 95% (non-condensing) |
| Dimensions and Weight | 101.5 mm X 87.5 mm X 15.5 mm, 200g |