How to coordinate the energy density and safety of lithium batteries?

Recently, a series of fires have occurred in electric vehicles of brands such as Tesla, NIO, BYD and others. How to balance the energy density and safety of lithium batteries? How far are all solid-state lithium batteries? 1. Lithium battery electrolyte is a flammable solvent. In lithium and positive capital, it is speculated that nickel and cobalt are active metals that are exposed to Burn in the air. 2. There is only a one-micron-thick separator between the positive and negative electrodes of cylindrical lithium batteries, which will cause a short circuit when the impact breaks briefly. 3. People have a natural hostility to the energy density and safety of lithium batteries. Because increasing energy density means using more active positive and negative materials, or reducing the thickness of the insulating film, both of these methods will significantly increase the battery's risk. 4. All-solid-state lithium batteries are the future development direction, but it will take a long time for scientific research. Recently, electric vehicles of brands such as Tesla, Nextev, and BYD are burning all over my country. Shanghai Tesla spontaneously ignited, and the fire instantly illuminated the entire garage. ▲Xi’an, Shaanxi: The cause of the fire during the repair of the Weilai Automobile ES8 is under investigation ▲A BYD e5 in Wuhan has a fire. The official said that the battery was not damaged although Tesla and Nextev A notice has been published that the cause of the car fire has not been recognized, and the investigation results will be announced in a timely manner, but this is obviously unable to completely stop the negative impact of both brands, and the anxiety caused by the expansion of industry and consumers. The Tesla Model SP85, which caused the fire in Shanghai, has now been discontinued. This is not the first time a Tesla has suffered spontaneous combustion. According to incomplete statistics, as of now, there have been more than 50 burning, spontaneous, and explosion accidents caused by driving, collisions, charging, etc. of Tesla electric vehicles worldwide, and it is called the car burning champion. Electric vehicle fires have occurred frequently, and the safety of electric vehicles and power lithium-ion batteries will once again face a storm of public opinion, casting a shadow over the rapid development of the new energy vehicle market. Why are the batteries of electric vehicles often overused? How do we deal with the safety of electric vehicle batteries? Battery knock and static electricity are important reasons for battery short circuits. In electric vehicle fires, most batteries include traffic collisions, short circuit and spontaneous combustion. . The prosperity of electric vehicles stems from the rapid development of lithium battery technology. Before it was widely used in electric vehicles, the batteries of mobile phones and laptop computers were burning and exploding. Except for different power systems, the chassis, body, interior decoration, etc. are no different from traditional internal combustion engine models. The battery is an important energy storage component of electric vehicles, which directly affects the performance of electric vehicles. In an electric vehicle, a single battery packs into a battery, and a certain number of batteries packs into a battery module module. Due to the limited battery loading space in the car, a large number of battery modules are required to operate, the battery will discharge at different rates, and a large amount of heat will be generated at different rates. In addition, the accumulation of time and the influence of space will make the battery's working environment temperature complicated and changeable. Regarding the specific circumstances of battery fires, Song Jian, executive vice president of the Institute of Automotive Engineering Development of Tsinghua University and deputy director of the State Key Laboratory of Automotive Safety and Energy, explained that this is generally because the battery electrolyte and its decomposition products are ignited. Song said that, academically speaking, lithium ion first performs two actions, one is called in-line and the other is called outbound. Whether it is discharging or charging, lithium ions move from one end of the battery to the other. The fuel tank of a diesel locomotive is only used to store fuel. Unlike the battery packs of electric vehicles, lithium batteries are both an energy storage device and a chemical reaction device. It reacts with oxidation when the battery is discharged. Chemical energy is converted into electrical energy, and then the electrical energy is output to drive the car's engine. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Will lithium battery recycling become an emerging industry?