The Battery Pack Main Relay is an essential component in the electrical system of an electric vehicle. It acts as a switch that connects or disconnects the high-voltage battery pack from the vehicle’s powertrain and electrical system. Located between the Battery Management System (BMS) and the battery pack, the main relay serves as the interface that controls the flow of electricity from the battery to the rest of the vehicle's systems.

    In simpler terms, the relay works like a gatekeeper, allowing power to flow from the battery when needed and cutting off the connection when it's not. This not only ensures the vehicle operates smoothly but also helps to protect the vehicle's electrical components from potential damage due to excessive current, voltage, or heat.