BCU (Rank-Level Management)
The BCU manages the battery rack and is typically installed in the high-voltage control box. It measures rack voltage, current and insulation resistance, calculates SOC and SOH, and provides fault diagnosis and protection. CAN, daisy-chain, RS485 and Ethernet interfaces enable communication with the BMU, BAU, PCS and EMS.
Product Specifications
| Item | Qty | Characteristic | Min | Typ | Max | Unit |
| Power Supply | 1 | Operating voltage | 12 | 24 | 32 | V |
| Power consumption | 1.92 | 2.88 | 3.36 | W | ||
| Total Voltage Sampling | 2 | Voltage range | 50 | – | 1500 | V |
| Sampling accuracy | – | ±0.5% @ 200–1500 V; ±1 V @ 50–200 V | – | – | ||
| Current Sampling (Shunt) | 2 | Voltage range | −75 | – | 75 | mV |
| Sampling accuracy | – | ±0.5% @ −75~−3 mV & 3–75 mV; ±30 µV @ −3–3 mV | – | – | ||
| Current Sampling (Voltage-type Hall) | 2 | Voltage range | 0 | – | 5 | V |
| Sampling accuracy | – | ±0.5 | – | % | ||
| 5V Power | 1 | Output voltage | 4.75 | 5.0 | 5.1 | V |
| Output current | – | – | 100 | mA | ||
| 12V Power | 1 | Output voltage | 11.5 | 12.00 | 12.36 | V |
| Output current | – | – | 300 | mA | ||
| Temperature Sampling | 4 | Temperature range | −40 | – | 125 | ℃ |
| Sampling accuracy | – | ±1 ℃ @ −20–65 ℃; ±2 ℃ @ −40~−20 ℃ & 65–125 ℃ | – | – | ||
| DIO (Software-configurable) | 9 | ViL | 0 | – | 0.5 | V |
| ViH | 3 | – | PWR+ | V | ||
| VOL (0–9) | – | 0.04 | 0.4 | V | ||
| VOH (0–9) | 2.5 | 2.9 | – | V | ||
| IO (0–9) | – | 1 | – | mA | ||
| High-side Switch | 8 | Output voltage | – | – | PWR+ | V |
| Output current | – | 3 A; 7 A @ 100 ms | – | A | ||
| Dry Contact | 2 | Load voltage | – | – | 32 | V |
| Load current | – | – | 0.5 | A | ||
| Insulation Resistance | 1 | Measurement range | 0 | – | 20 | MΩ |
| Measurement accuracy | – | ±10% @ 75 k–20 MΩ; ±10 kΩ @ 0–75 kΩ | – | – | ||
| SOC | – | SOC accuracy | – | – | ±5 | % |
| Item | Qty | Characteristic | Min | Typ | Max | Unit |
| CAN | 3 | Rate | – | – | 500 | kbps |
| RS485 | 3 | Rate | – | – | 57600 | bps |
| Daisy Chain | 2 | Rate | – | – | 2 | Mbps |
| EEPROM | 1 | Storage | – | 64 | – | kB |
| FLASH | 1 | Storage | – | 8/256 | – | MB |
| Ethernet (Shared IP) | 2 | Rate | – | 10/100 | – | Mbps |
| Environment | – | Operating temperature | −40 | – | 85 | ℃ |
| Storage temperature | −40 | – | 85 | ℃ | ||
| Operating humidity | 5 | – | 95 | % | ||
| Operating altitude | – | – | 4000 | m | ||
| Safety | – | Isolation working voltage | – | – | 1500 | V |
| Withstand voltage test | 6000 | – | – | VDC | ||
| 4240 | – | – | VAC | |||
| Insulation resistance (2500 VDC) | 100 | – | – | MΩ | ||
| Clearance distance | – | 14.5 | – | mm | ||
| Creepage distance | – | 30 | – | mm | ||
| Pollution degree | – | – | II | – | ||
| ESD | – | Air discharge | – | ±15 | – | kV |
| Contact discharge | – | ±8 | – | kV | ||
| Enclosure | – | Dimensions | Exterior: 235 mm × 107 mm × 30 mm; Cutout: 226 mm × 98 mm | |||
| Material | ABS+PC, black fine-textured matte finish | |||||
| Flammability rating | UL94-V0 | |||||
| Others | – | IP rating | IP40 | |||
| Weight | 330 g |
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