wBMS-MX
The Wattius wBMS-MX is a compact distributed Battery Management System developed for high-voltage batteries.
This system is composed by the BMU (Battery Monitoring Unit) and CMU12s (Cell Monitoring Units, each for up to 12 cells). Each BMU supports up to 24 CMU12s for a total of 288 cells in series.
Multiple BMUs can be connected in parallel without additional hardware. The system automatically handles smart string connection / disconnection and provides a single control interface with EMS / Inverter.
Each CMU12 can monitor up to 12 cells with total maximum voltage measurement error of ± 1,5 mV, and 3 external temperatures. The BMU provides multiple configurable I/O options, as well as CANbus, Bluetooth and USB interfaces.
Performance
- 12-cell Cell Monitoring Unit.
- Up to 24 CMU12s per BMU.
- Up to 16 BMU automatic parallelization.
- Support for external isolation monitors and HV sensors.
- High-precision SoC algorithm.
- EMC CE Class A & B compatible.
Connectivity
- CANbus, Bluetooth & USB.
- Real-time logging of events, alarms and data to micoSD card.
- Monitoring, configuration & analysis with free wBMS-Toolkit PC software.
Safety
- Internal diagnostics and safety-critical redundant systems.
- Cell and relay open-wire detection.
Power supply | 9 – 36 Vdc. |
Consumption | Active: < 1 W Deep sleep: < 35 mW. |
Supported CMUs | Up to 24 CMUs per each BMU. Compatible with all wBMS-MX and wBMS-HX CMU models. |
Current sensing | External 0 – 5 Vdc single-ended hall current sensor. Accuracy < ± 0,1 mV. Support for external CAN bus current sensors. |
CAN interface | CAN bus 2.0 A/B (Up to 1Mb/s). Referenced to external power supply. Configurable termination resistor with switch. |
Other interfaces | Mini USB 2.0. Bluetooth 5.0 Low Energy. |
General input | 2x analog / digital (configurable) signal up to 36 Vdc. 4x dry contact digital input. Configurable to multiple functions (ignition key, HVIL, relay feedback etc.). |
General output | Maximum total output 4 A. 6x low-side switch. Up to 2 A nominal, 3 A peak. Extended diagnostics. Configurable to multiple functions (contactor, precharge, alarm, coolong, etc.). |
High-voltage measurement | Direct support with wBMS-VIC. Support for third-party external CAN bus. |
Isolation measurement | Direct support with wBMS-VIC. Support for third-party external CAN bus. |
Memory | Integrated redundant non-volatile memory: system configuration, maximeter and flags. MicroSD support (up to 32 GB). |
Parallelization | Up to 16 BMUs in parallel. Smart parallelization management without additional hardware. Multiple battery string management in each BMU. |
Dimensions | L80 x W70 x H16 mm. 4x M4 mounting holes. |
Operating temperature range | -40 to +85 ºC. |
Connectors | Molex MicroFit. |
Cell measurements (voltage & temperature) | Multiple cell chemistry. Extended internal redundancy and hardware integrity diagnostics. Open wire detection. |
Cell voltage | 5 – 12 cells. 0,1 – 4,5 Vdc. ± 1,5 mV cell voltage max total error. |
Cell temperature | Up to 3 channels. Configurable NTC. ± 1 ºC cell temperature max total error. |
Balancing | Configurable autonomous passive balancing strategy. 16 Ω per channel. |
Isolation | Isolation rated for 800V. |
Consumption | Active: < 10 mA Sleep: < 10 µA |
Operating temperature range | -40 to +85 ºC |
Dimensions | L92 x W54 x H12 mm. 4x M4 mounting holes. |
Connectors | Molex MicroFit. |
All wBMS models are compatible with the same wBMS-Toolkit, a free PC software that provides real-time monitoring of all BMS measurements, as well as configuration of thousands of parameters in a flexible and intuitive way.
Connection between wBMS-Toolkit and the devices can be established through USB, CAN bus, Ethernet or even Bluetooth.
