This gas sensor utilizes a high-sensitivity electrochemical detection principle. It identifies the toxic, hazardous, and combustible gases released during thermal runaway—triggered by events such as internal short circuits, overcharging, over-discharging, or physical impacts—by generating an electrical current through redox reactions involving these gases and oxygen. The sensor enables the early detection of battery-related fires, facilitates intelligent assessment, and provides proactive warnings. This helps safeguard the lives of passengers and drivers in electric vehicles, ensuring a critical window of time for the evacuation of occupants.