Original title: Release of China Electric Vehicle Fire Safety Index

China Quality News Network (Wenhe) Recently, China Electric Vehicle Fire Safety Index (C-EVFI), a research achievement that fills the gap in the industry, was released in Chongqing. More than 200 guests and representatives from industry authorities, industry associations, relevant departments of Chongqing, universities, automobile manufacturers and mainstream media attended the event.

All element electric vehicle fire safety test and evaluation system

With the purpose of ensuring the safety of life and property of drivers and passengers as the starting point, this achievement independently, objectively and impartially evaluates the fire safety protection performance of the entire electric vehicle through a combination of qualitative and quantitative methods, which can provide technical support for the safety supervision, positive product development and quality improvement of electric vehicle products, and provide reference for consumers to choose and purchase vehicles, Lead the new energy vehicle industry to continuously improve the level of safety technology.

With the large-scale application of new energy vehicles, the fire accident of new energy vehicles has attracted great attention from the society, and has become an important factor affecting the high-quality development of the new energy vehicle industry. The production of safe and reliable new energy vehicles with outstanding performance will be an important weight for enterprises to gain brand and market competitiveness. For the fire safety of electric vehicles, China currently focuses on the thermal runaway and thermal diffusion of power batteries. The statistical data of electric vehicle fire accidents over the years shows that battery system failure, high voltage system failure and electronic and electrical component failure are the three main factors for electric vehicle fires. Therefore, it is urgent to propose a fire safety test and evaluation system for electric vehicles that basically covers all elements to improve the fire safety capability of electric vehicles.

Sun Fengchun, an academician of the Chinese Academy of Engineering and a professor of Beijing University of Technology, said in his speech that with the development of China's new energy vehicle industry, the problem of the endurance mileage of electric vehicles has been solved through various efforts. The next problem to be solved urgently is the safety of electric vehicles. Safety supervision, especially the prevention and supervision of fire safety, is the "three-level supervision system" of new energy vehicles The top priority of. Building a fire safety test and evaluation system for the whole life cycle of China's electric vehicles is of great significance for promoting enterprises to continuously improve their product safety technology level.

Dong Jingfei, chairman of the Fire Protection Committee of the China Consumer Goods Quality and Safety Promotion Association, said that the proposal and implementation of China's electric vehicle fire safety index will, to a large extent, lead the improvement of China's electric vehicle fire safety technology and effectively ensure the travel safety of the people.

Evaluation on the improvement index of China Merchants Auto Research to build a "circle of friends"

At present, the automobile industry is undergoing technological and industrial changes marked by electrification and intelligence. Driven by both policy orientation and market demand, China's new energy automobile industry has made great progress and become an important force leading the transformation and upgrading of the global automobile industry. Wang Cheng, deputy general manager of China Merchants Testing, said in his speech that China Merchants Automotive Research Co., Ltd. took the initiative to play the role of central enterprises, played the role of the National Quality Inspection Center in public technical services and quality technology highland, focused on the improvement of new energy vehicle product quality and safety technology, and proposed to study and develop a "prevention, prevention, management, control, and inspection" system for electric vehicle fires, It has received strong support from the National Engineering Research Center for Electric Vehicles of Beijing University of Technology, the Fire Protection Committee and the Automobile Committee of the China Consumer Goods Quality and Safety Promotion Association, Shenzhen Yiaitong Intelligent Technology Co., Ltd. and other units.

The China Electric Vehicle Fire Safety Index is led by the Chen Bin team, director of the China Merchants Automotive Research New Energy Technology Innovation Center. The team is committed to the research of new energy vehicle safety technology, creating a number of industry wide firsts in the field of new energy vehicle fire safety, and forming a systematic research results including equipment development, standard formulation, technical services and basic research. It has developed the industry's first "new energy vehicle fire multi-source data fusion integration test platform", and formulated a series of standards of "Electric Vehicle Fire Safety Test Method", which can ensure the professionalism and reliability of the index.

China's electric vehicle fire safety index assesses many aspects of electric vehicles

The fire safety index of China's electric vehicles is mainly tested and evaluated around four aspects of electric vehicle fire safety tips, emergency rescue, fire protection and data linkage. For example, when the battery temperature is too high/out of control, is there a clear reminder inside and outside the vehicle? How accurate is the information reminder? Is there an early warning when thermal runaway is about to occur? Is there any thermal diffusion in the battery system after thermal runaway? Can the door be opened normally? Is there a risk of electric shock or is there an emergency switch? Is the platform data uploaded normally? Is there an emergency call function? Then calculate the score by professional formula and divide the vehicle fire safety level.

It is understood that the vehicle fire special laboratory of China Merchants Auto Research New Energy Center is 8000 cubic meters; It is equipped with a 230000 m3/h smoke treatment system to deal with the waste gas generated in the fire test in real time; It can reproduce the fire event of the whole new energy vehicle and its parts below 12 meters, and is equipped with a variety of fire extinguishing methods. It can study the ultimate safety performance of the whole new energy vehicle and its parts under fire conditions. During the test, more than 20 kinds of data of more than 500 routes, such as temperature, voltage, pressure, flow, temperature field, smoke concentration, smoke composition, image, flame height, thermal radiation, will be collected and saved as the original data for judging the fire safety index of electric vehicles and will be permanently saved.

How to implement the fire safety index of electric vehicles in China

Chen Bin of China Merchants Auto Research said that the current fire safety standards for new energy vehicles are limited to the fire of power batteries. For the test methods and requirements related to the fire and thermal diffusion of power battery systems, the focus is on how to verify the fire prevention level of power battery systems, not related to the standard system related to the fire of electric vehicles. The evaluation method of fire safety index of electric vehicles in China is to trigger the thermal runaway of batteries by heating. The trigger object of thermal runaway is the single battery in the battery pack, and the single battery far away from the pressure relief valve and temperature collection point of the battery pack is selected. The power of the heating device shall be equal to 2.5 times of the electric energy of the single battery in numerical value. If the electric energy of the single battery is 100Wh, the maximum power of the heating device is 250W. The temperature sensor is arranged at the positive pole of the trigger object and its adjacent battery cells, and simultaneously collects the voltage of the trigger object and its adjacent battery cells.

The release of China's electric vehicle fire safety index, based on the safety protection of drivers and passengers' lives and property, is a "hot eye" created for the industry after the "three flavors of fire" refining, and provides important reference for consumers to choose electric vehicles. It is believed that under the guidance of competent authorities and the efforts of scientific research institutions, the electric vehicle fire safety evaluation system will contribute to improving the safety technology level of electric vehicles in China, reducing accident rates and reducing casualties.