17
Battery module management module: BMU, integrated with the battery module.
Battery cluster management module: BCU, integrated with the high voltage box.
Battery system management module: PCU, integrated with the high voltage box.
BMS can monitor the current, voltage, and temperature of cells in the battery module in real-time,
calculate the SOC of the battery system, communicate with the host computer software, and send fault
and alarm information.
The schematic diagram of the communication structure of the BMS is shown as follows.
Figure 13. Communication topology
3.3.1 BMU
The BMU integrated with the battery module is the initiating unit of the BMS. It monitors battery
voltage and temperature and transmits cell information to the BCU through the communication port.
BMU's main technical specifications are shown as follows.
Table 10. BMU main technical specifications
No.
Item
Specification
Remark
1
Power supply
24 VDC
2
Power consumption
＜
1 W
Without equalization
3
Voltage sampling channels
15 strings
Compatible with 16 strings
4
Voltage sampling range
0 V
～
5 V
Accuracy ±10 mV
5
Temperature sampling
channel
4 cell sampling and 1 PCB
sampling
6
Temperature sampling range
-20
℃～
125
℃
Accuracy ±2
℃