The Battery Pack Main Relay (BPMR) is a critical component in the powertrain of electric vehicles (EVs), hybrid electric vehicles (HEVs), and other battery-driven systems. This relay plays a pivotal role in managing the flow of electricity from the battery to various systems within the vehicle, ensuring that energy is delivered safely and efficiently. In this article, we will explore the significance of the Battery Pack Main Relay, its key functions, features, and applications.

What is a Battery Pack Main Relay? A Battery Pack Main Relay is an electrical switching device that connects and disconnects the battery pack to the rest of the vehicle’s electrical systems. It is usually positioned between the battery and the high-voltage systems, such as the electric motor and inverter. By controlling the power supply to these systems, the relay ensures that energy is only delivered when it is required, and it also provides protection against potential hazards. Main Functions of the Battery Pack Main Relay Controlling Battery Power Flow： The primary function of the BPMR is to control the flow of electricity from the battery pack to the vehicle’s propulsion system. This includes the electric motor, charging system, and power inverters. The relay connects the battery to these systems when the vehicle is operational and disconnects the battery during shutdown, ensuring no unintended power consumption or risks.