The main function of the BMS Thermal Control Relay is to manage the temperature of the battery pack. Batteries, particularly lithium-ion ones commonly used in electric vehicles and other high-performance applications, are highly sensitive to temperature. Both overheating and overcooling can degrade battery performance, reduce its lifespan, or even cause catastrophic failures. The thermal control relay helps in maintaining a balance by enabling or disabling temperature regulation mechanisms based on the current conditions.

    The thermal control relay works by continuously monitoring the battery pack's temperature through temperature sensors integrated into the BMS. These sensors provide real-time data that the relay uses to make decisions. When the temperature deviates beyond the safe threshold—either too high or too low—the relay activates cooling or heating systems, such as fans, liquid cooling systems, or heating pads, to return the battery to an optimal operating temperature.