Does the close proximity between the BMS control board's communication interface and power port cause cross-electromagnetic interference?

Yes, if communication interfaces and power ports are placed too close together on the PCB or via connectors, cross-electromagnetic interference is highly likely. Power ports typically experience significant voltage and current variations, making them strong noise sources. The magnetic and electric fields they generate can couple to nearby communication interface cables or PCB traces, causing noise superimposed on the communication signal and leading to bit errors. Similarly, communication signals can also interfere with the power supply. The solution is to strictly adhere to zoning principles during layout, physically separating power ports and communication interfaces with sufficient distance. If space is limited, a grounding isolation strip or shielding partition can be added between them. Ensure that power lines and signal lines are not run parallel for long distances.