The communication between the charging station control board and the vehicle BMS is mainly achieved through the following methods:

1. Communication protocol

CAN bus communication: This is the most commonly used communication method between the charging station control board and the vehicle BMS. According to the standard GB/T 27930-2015, the charging station communicates with the BMS through the CAN bus to obtain the status information of the vehicle battery (such as remaining power, temperature, allowed larger charging current and voltage, etc.), and adjusts the charging parameters based on this information.

OCPP protocol: used for communication between charging stations and backend management systems, supporting remote monitoring, management, and control functions.

Modbus protocol: also used in charging stations for data exchange with devices such as electric meters.

2. Communication process

Handshake stage: The charging station sends a handshake message to BMS, and BMS replies with confirmation to establish a communication connection.

Charging parameter configuration: The charging station adjusts the charging current and voltage based on the battery status information feedback from the BMS.

Charging process: BMS sends real-time battery status information, and the charging station dynamically adjusts charging parameters based on this information.

Charging completed: BMS notifies the charging station that charging is complete and the charging station stops charging.

3. Security protection

The main control board of the charging station monitors the electrical parameters during the charging process in real time. Once any abnormalities are detected (such as overcurrent, overvoltage, undervoltage, leakage, etc.), the circuit will be immediately cut off.

Cooperate with BMS to monitor battery temperature and charging status, prevent battery overheating, overcharging, and overdischarging.

Through these communication methods and processes, the charging station control board can achieve intelligent control of the charging process, ensuring safe and efficient charging.