New energy car spontaneous combustion? Power battery combustion accounted for 31%

According to incomplete statistics, since 2018, new energy vehicles spontaneous combustion problem or explosion has happened nearly 50. It makes the whole society to electric cars under the environment of high temperature of the concerns of the security and stability of battery goes further. What is the cause of these events? Recently, the economic daily news reporter interviewed a professor at Peking University, lithium electricity & other; Davos & throughout; Academic committee chairman lu.

the Chinese Academy of Engineering to smell immediately think photovoltaic integration design and manufacture of the construction project has become a highly automated manufacturing industry with high efficiency, greatly reduce the cost of pv construction, promoting the rapid acceptance of photovoltaic building promotion; Directly promoting building energy efficiency, which is beneficial to solve our energy state of tension, enhancing the energy security of our country. Photovoltaic building integrated embodiment is a kind of system integration thought, improving the capacity of photovoltaic building integrated photovoltaic engineering construction in the future will be the important direction of development. This line of thinking in the photovoltaic engineering especially in the construction of the Olympic Games, almost all of the photovoltaic power station are all more or less is a combination of architecture and landscape design. Among them, the national stadium, the most prominent.

to ensure that the 2008 Olympic Games in Beijing all the safe operation of electric buses, the shandong team conducted the study found that: the electric car safety is not only determined by the battery, lithium battery materials is the main reason.

in the lu's view, the cause of a fire accident, power battery combustion accounted for 31%, mainly because of improper lithium battery materials selection and the quality problem of the battery itself. “ Fast charging, conductivity bad lithium battery is easy to produce a lot of heat, temperature rise sharply, leading to thermal runaway. ” The lu said. Since 2017, according to new energy vehicles on fire accident analysis of statistics, charging is the epicenter of the fire, accounted for 50%.

in the lithium battery has a large number of flammable substances, such as the water soluble liquid electrolyte, when it is exposed to air temperature of 60 ℃ to 70 ℃, it will burn. It said, to explore the reason for the electric car problems, don't completely due to lithium battery. Compared with the car fuel, fuel to burn, actually more terrible burning explosion accident. Every year all over the world, however, spontaneous or fuel car explosion accident probability is very low.

in recent years, with high energy density and strong life of electric cars, attention, has been used some high cell density. However, the lithium battery materials in the process of charging and discharging easier to heat, and with the constant improvement of the energy density, thermal runaway also had a sharp rise in risk. At the same time, the car collision will make the battery pack deformation, cause the battery diaphragm torn and internal short circuit, also easy for flammable electrolyte leakage cause a fire.

　　“ The design of the electric car has always been the core of the problem. ” The lu said, because in the process of driving or charging, battery will generate heat. However, it is no good scheme of lithium battery fast heat dissipation. Therefore, to speed up the development of lithium battery core materials and battery technology is urgently needed.

and thoroughly solve the problem of the future electric car safety, not only is the problem of the battery. The lu believes that in the near future electric cars to development, solve the security problem in big strides, combined by hydrogen fuel cells and lithium battery, may have a very important role. “ I always encourage to promote the use of methanol fuel cell, and has conducted more than 10 years of research work. The working principle of methanol and hydrogen fuel, but it doesn't need to use low temperature, high pressure, it can be combined with lithium battery, in terms of technology with hybrid or power as the guidance, increase program is expected to rapidly promote the development of electric vehicles. ”