Hyundai Mobis develops technology to automatically suppress electric vehicle battery cells when they fire

Apr 14, 2025

Photo courtesy : carguy(www.carguy.kr)



Technology to prevent thermal runaway of electric vehicles is being advanced. Hyundai Mobis announced on the 14th that it has succeeded in developing a new technology that can immediately extinguish a fire by automatically spraying fire extinguishing drugs when a battery cell fires. Thermal runaway can be prevented by preventing heat transfer to adjacent cells, and it is known as an advanced technology that has not yet been commercialized worldwide.

Hyundai Mobis designed the battery system to not only delay thermal runaway from heat and flames by using heat-resistant materials, but also to cut it off. Major countries such as Europe, China, and India are required to delay thermal runaway for at least five minutes after the initial ignition of battery cells, and some countries are also seeking to strengthen laws to prevent heat waves from occurring. Accordingly, Hyundai Mobis' battery system (BSA) with cell-level fire extinguishing function is expected to be spotlighted as a next-generation safety technology in the global market.

BSA, developed by Hyundai Mobis, consists of a battery management system (BMS), hardware composed of fire extinguishers and battery cases, and software logic that controls them.




Based on the real-time data collected by the sensor, BMS analyzes the temperature and voltage of the battery and the pressure inside the battery system to determine the abnormal signs. When firing, set the location to spray the drug and command the fire extinguishing device to operate.

The software is designed to enable quick and accurate judgment and response to physical changes that may occur in the battery system. Hyundai Mobis' high reliability judgment logic is characterized by applying multiple safety devices and dual algorithmic structures.

Inside the battery system, it is equipped with a fire extinguisher that is five times the capacity of a general household fire extinguisher (kilogram). This drug is a material with excellent cooling, insulation, and permeability, and is harmless to the environment and the human body.




In developing the technology, Hyundai Mobis also applied for a total of three domestic and foreign patents, including battery cases and fire extinguishers. It includes pipes for digestive medicine and design technology that can be sprayed with strong pressure.

Park Yong-joon, head of Hyundai Mobis' battery system research division, said, "With the emergence of large electric vehicles with improved mileage, the safety standards of battery systems are becoming more difficult. We will develop an advanced battery system that exceeds global standards and integrates hardware and software to introduce it to the global market."

Meanwhile, Hyundai Mobis also developed a new material to prevent overheating of batteries last year and is focusing on commercializing them. The material, called a vibrating heat pipe, consists of aluminum alloy and refrigerant, and is a technology that places it between battery cells to lower the temperature inside the battery system during rapid charging. It is expected to be applied as a stable thermal management system even when fast charging.








This article was translated by Naver AI translator.