1. BMS1810 Introduction
LiBat™ BMS1810 is a compact battery management system tailored for distributed master-slave battery applications. This fully digital, standalone device is a ready-to-use solution for 5S-18S master battery management systems: it measures up to 18 cells on the board and drives slave modules over an isolated daisy chain. It adapts to high voltage, high power and high energy applications through external electrical components such as contactors and current sensors. Once set with the correct system parameters, the BMS1810 operates without the need for ongoing user interaction.
Key Features:
- Small design 97.0 mm x 87.7 mm, 109.4 mm wide with the mounting ears
- Compact, plug-and-play BMS
- Built in 5S - 18S cell measurement with 0.1mV resolution
- Dual channel external current measurement
- Adjustable passive balancing current
- Low power consumption when shut down
- 1 x CANBus 2.0b, 2 x RS232, 1 x RS485
- 5 external NTC temperature probes, 1 on-board NTC
- Configurable I/O: 2 high-side outputs, 2 open-collector outputs, 2 optocoupler inputs, 2 relay outputs
- Up to 8 BMS1202 slave modules via isolated communication
- Compatible with distributed slave connection
Table.1.1: BMS1810 Technical Specifications
| PARAMETER | SPECIFICATIONS |
|---|---|
| Power Source | Self or External Power, 16 V to 80 V on connector 14 |
| Power Consumption | Power Down: ~0.050 mW , RUN State: ~1015mW |
| Wake Up Trigger | User Button |
| LEDs | 3x Status LEDs |
| Relays | 2x Relay Outputs |
| Inputs | 2x Optocoupler Inputs (ON when connected to GND), 1x User Button Input with LED output |
| Outputs | 2x High-Side Switch Outputs (12 V), 2x Open-Collector Outputs (10 kΩ pull-up to 12 V) |
| Precharge | Configurable Software Timer |
| DFU Mode | Embedded bootloader for firmware upgrades. |
| Digital Interface-1 | 1x Half Duplex RS485 |
| Digital Interface-2 | 2x RS232 (No.0 service port; No.1 not used by the current firmware) |
| Digital Interface-3 | 1x CANBus 2.0b |
| Communication Protocols | LiBat COM, JSON, Modbus RTU |
| Current Sensor | Compatible with 5V external current sensors |
| Number of cells | Up to 18 Cells. Minimum 16 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, 1x 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 | 97.0 mm X 87.7 mm (109.4 mm with the mounting ears) X 14.5 mm, 150g |