Automobile is one of the representative works of industrial civilization, and it is also a pillar industry of a country. The continuous evolution of cars has improved people's living standards. However, the ensuing environmental problems and resource problems have brought crisis to human society. With the serious shortage of petroleum energy and the growing voice of energy conservation, the research project of new energy vehicles has been listed as a 863 major scientific and technological topic of the country. In recent years, the continuous smog in major cities in China has made people pay more and more attention to environmental issues. In this context, domestic and foreign car companies have also launched new energy vehicles based on hybrid and pure electric vehicles, and the government has also issued Relevant policies have opened a green channel for the development of new energy vehicles.

New energy vehicles include gas vehicles (liquefied natural gas, compressed natural gas), fuel cell electric vehicles (FCEV), pure electric vehicles (BEV), liquefied petroleum gas vehicles, hydrogen-powered vehicles, hybrid vehicles (oil-gas hybrid, oil-electric hybrid) Solar vehicles and other new energy vehicles (such as high-efficiency energy storage) vehicles, etc., have relatively low exhaust emissions. From the perspective of the development of new energy vehicles in the world, its power sources mainly include lithium-ion batteries, nickel-hydrogen batteries, fuel cells, lead-acid batteries, and supercapacitors. Among them, lead-acid batteries and supercapacitors mostly appear in the form of auxiliary power sources. The main reason is that these battery technologies are not fully mature or have obvious shortcomings. Compared with traditional cars, there are many gaps in cost, power and cruising range. This is also an important reason for restricting the development of new energy vehicles.

As the core component of new energy vehicles, the storage battery is the most concerned thing in terms of energy storage and safety, and it is also a problem that must be faced with the rapid development of new energy vehicles.

The earliest American Tesla pure electric car fire incident, with the battery fire, the outside world questioned, the stock decline, unanimously popular Tesla seems to be in big trouble. While questioning Tesla, people once again began to discuss the safety of pure electric vehicle batteries.

The following figure is a fire map of an electric bus in Shenzhen in the near future. It is said that the bus was charging at that time, and the battery fixed in the car smoked first. The on-site staff failed to properly handle the smoking battery. Then the battery caught fire, which spread rapidly and the bus was eventually burned down. This incident has aroused widespread concern in the new energy vehicle industry. It can be seen that the development of new energy vehicles must solve the problem of battery safety.

Car fire spontaneous combustion or fire caused by various reasons occur from time to time, a considerable part of which occurs near the battery, and some cause damage to the battery shell. It can be seen that the development of new energy vehicles is bound to solve the problems of battery energy storage and battery safety, and as the battery shell plays the first flame retardant line of defense in terms of safety, it plays a vital role. Therefore, we have a look at the battery shell with engineering plastics.

The outer shell of the battery is used to hold the electrolyte and the plate group, and should be made of materials with good acid resistance, heat resistance, shock resistance and insulation and certain mechanical strength. Early production of batteries mostly hard rubber shell. With the development of engineering plastics, engineering plastics are gradually replaced by engineering plastics because of their simple production process, high production efficiency, easy heat sealing, no harmful impurities and low cost.

The current battery shell using SAN and ABS materials are more common, there are also PP or PVC materials, some high-end models using flame retardant PPO shell. The technical parameters that characterize the performance of these materials are summarized in terms of mechanical properties, electrical properties, thermal properties and flame retardant properties, which must be able to meet the requirements of battery use.

Mechanical properties: The material should have the ability of impact resistance, vibration resistance, extrusion resistance and bumping resistance, and the inflatable pressure generated by the gas in the battery should also be considered.

Corrosion resistance: battery tank at a certain temperature and long-term contact with sulfuric acid solution, should not occur due to erosion and swelling, cracks and discoloration and other adverse reactions.

Flame retardant performance: When the battery fails to explode, the shell should have flame retardant properties to prevent the material from continuing to burn and cause damage.

Shanghai Risheng New Technology Development Co., Ltd. has been focusing on the modification of engineering plastics for 19 years. With years of research and development experience, the company has successfully developed various types of flame retardant modified PPO, which has low shrinkage, low density, and high flame retardant grade., High heat resistance, good toughness, chemical resistance and other advantages, fully meet the requirements of battery shell materials. At present, there are many types of modified flame retardant PPO is recognized by customers. The battery shell material is polyphenylene ether, which not only has good performance, but also has high safety factor and enhances the value of use experience.