CAN bus in electric vehicles: The backbone of modern EVs

The CAN bus is a crucial component in the operation of electric vehicles (EVs), providing the backbone for communication between the different components of the vehicle. In this blog, we’ll explore how the CAN bus is used in EVs, including battery management, motor control, and charging systems.

Battery management

The battery management system (BMS) is one of the most critical components of an EV, ensuring that the battery is charged, discharged, and maintained within safe and optimal limits. The BMS uses the CAN bus to communicate with the other components of the vehicle, including the motor controller, the charger, and the dashboard display. Through the CAN bus, the BMS can monitor the state of charge, the battery temperature, and the voltage levels, allowing it to optimize the performance and longevity of the battery.

Motor control

The motor controller is responsible for converting the DC voltage from the battery into AC voltage to drive the electric motor. The motor controller uses the CAN bus to communicate with the BMS, the accelerator pedal sensor, and the brake pedal sensor, among other components. The motor controller receives signals from the sensors via the CAN bus, allowing it to adjust the torque and speed of the motor based on the driver’s input and the vehicle’s operating conditions.

Charging systems

The charging system is another critical component of an EV, allowing the battery to be charged from an external power source. The charging system uses the CAN bus to communicate with the BMS, the onboard charger, and the charging station. Through the CAN bus, the charging system can monitor the charging status, the charging rate, and the temperature of the battery, ensuring that it is charged safely and efficiently.


The CAN bus is an essential component of modern EVs, providing the communication backbone for the different components of the vehicle. Whether it’s battery management, motor control, or charging systems, the CAN bus enables the different components to work together seamlessly, optimizing the performance, efficiency, and safety of the vehicle. As EVs become more prevalent, the importance of the CAN bus in their operation will only continue to grow.