The battery management of automotive BMS has shifted from CAN communication to Daisy chain bridge communication. In the Daisy chain loop architecture, even if one end of the communication cable is disconnected, the communication of all battery modules can be ensured through reverse communication, thereby enhancing the stability of communication.

Leiditech EMC team took the application of NXP's MC33664 and MC3377X as examples to make a diagram of the electrostatic and surge protection scheme for daisy-chain communication circuits:

 The recommended part numbers for the electrostatic and surge protection scheme of daisy-chain communication circuits are as follows:

All the above-mentioned devices comply with the IEC 61000-4-2/ IEC 61000-4-5/ AECQ-101 standard.

For other interfaces on the BMS control board, Leiditech Electronic also has targeted protection solutions:

Power reverse connection and surge protection solution:

Shanghai Leiditech's anti-reverse connection surge protection for the power supply end of the BMS system part number:

Plugin CAN FD communication interface protection solution:

RS485 Serial port communication interface protection solution

The ESD Part Numbers recommended by Shanghai Leiditech for electrostatic protection of each interface of the BMS system are as follows:

Leiditech EMC team suggests adding appropriate TVS diodes and other protective components in the high-voltage side switch control, low-voltage side power supply, and voltage, current, and insulation resistance detection links to prevent overvoltage or overcurrent. The specific parameters need to be determined according to the actual situation. Thank you for watching. Please offer your valuable suggestions!