On August 3, a quality appraisal team composed of 13 experts from China's new energy vehicle industry announced the appraisal results of the crash of the BYD electric taxi in Shenzhen on May 26: The main cause of the fire of the e6 pure electric car was that it was received twice After high speed and severe collision, the rear of the car body and the battery tray are severely deformed, the power battery pack and the high-voltage distribution box are severely squeezed, causing some power batteries to be damaged and short-circuited, and the high-voltage line in the high-voltage distribution box is formed between the car body Short circuit, arcing, ignition of combustible materials such as interior materials and some power batteries. The appraisal report stated that the car's power battery did not explode in the accident, and 72 of the 96 power batteries did not catch fire. A subsequent announcement issued by BYD's board of directors stated that the 24 single cells involved in the combustion, the aluminum alloy casing and the battery plates were partially burned, but the battery plates remained neat and well-organized, without bursting. It can be seen from the above that although not all power batteries have burned, there are 24 batteries burning, indicating that the reliability of e6 power batteries still has some safety hazards, although the products of existing electric vehicle manufacturers in the world are at this speed It may be impossible to avoid the same serious situation in an impact accident. Therefore, out of consideration for the personal safety of electric vehicle occupants, although the analysis of the remedy is a bit harsh, it is not without benefits for the healthy development of China's new energy vehicles in the future. Regarding this report, Ding Xianghuan, chief engineer of Dongguan Shanshan Battery Materials Co., Ltd., said in an exclusive interview with Nikkei Technology Online that e6 is a pure electric vehicle and there are no flammable factors such as a large amount of gasoline. Under the ignition of friction sparks or electric sparks, although simple materials such as car interiors can cause ignition, after all, the main part of the vehicle is still a metal component. Under normal circumstances, it is difficult to form the raging like the previous media reports in a short time. Fire. Therefore, the greater possibility, as stated in the appraisal report, "ignition of combustible substances such as interior materials and some power batteries" is the reason for lithium-ion batteries. The flammable substances in power batteries mainly refer to the anode material (especially the anode material in the charged state) and the electrolyte, and the two easily catch fire and form violent combustion. Ding Xianghuan believes that even if a lithium iron phosphate battery is used, e6's battery safety is not perfect. Power battery suppliers, including BYD, still need to do more in-depth and detailed research on the safety of battery packs and single cells, such as the development of flame-retardant electrolyte materials to improve the safety of batteries under short circuit. Performance under extreme conditions, etc. At the same time, we also need to pay more attention to the testing standards for new energy vehicle power batteries, and to examine the safety of batteries in extreme cases. However, he also pointed out that from another perspective, if it was not a pure electric car but a regular gasoline car that was hit at a high speed this time, it is entirely possible to cause similar results, although we are not willing to see this situation. As a new thing, in terms of safety, people often have higher expectations of safety than gasoline vehicles. This has also brought greater pressure to the popularization of electric vehicles. This seems a little “fair†to the new energy vehicle industry, but throughout the ages, all new things have to accept this, that is, to do better and stronger to survive and replace the old things. I hope that this can be used as a mirror. The relevant national management departments will improve the quality standards of electric vehicles and power batteries as soon as possible. Various vehicle and power battery manufacturers can also cooperate in technological development to provide consumers who are "dare to eat crabs" with safety and reliability. New energy vehicles. Wang Zidong, director of the National 863 Electric Vehicle Major Special Power Battery Test Center, has repeatedly emphasized that: "The only way out for Chinese new energy vehicles and power battery manufacturers is cooperation. If you continue to fight alone, there is only a dead end." This is by no means alarmist. Omni Microphone,Omni Directional Mic,Omni Directional Microphone,Omni Directional Condenser Microphone NINGBO SANCO ELECTRONICS CO., LTD. , https://www.sancobuzzer.com