The biggest difficulty in the research and development of new energy vehicles is the power battery. How to make it safer, more economical, and more efficient is a dazzling mountain for many scientific teams. At the 2013 Chongqing Science and Technology Awards Conference held on September 17, a key to the power battery system for new energy vehicles was completed by Chongqing Changan New Energy Automobile Co., Ltd., Chongqing University of Posts and Telecommunications and Chongqing Changan Automobile Co., Ltd. Technology" won the first prize for technical invention. This technology allows the battery to lose power within 1 second of a collision. Ren Yong, general manager of the project and general manager of Chongqing Changan New Energy Automobile Co., Ltd. introduced that the most important part of new energy vehicles is the battery pack, which is made up of numerous batteries. This collection is not a simple addition, but Need a complete battery management system. "How to make these batteries charge and discharge effectively? How to ensure the safety of the battery system when the car is driving? How to accurately display the power? These are the key technologies." Ren Yong said that after years of scientific and technological research, they broke through the new energy vehicle. The key technologies of power battery systems cannot adapt to the bottleneck of complex and harsh environments, and independently developed power battery system technologies with high safety, high economy, and high reliability. Chang'an New Energy Electric Taxi Ren Yong introduced that through this technology, the safety coverage of the power battery system can be increased from the past 13% to 97%. "Because the battery pack must be safely and effectively operated in the automobile, we must handle mechanical, electrical, and The battery cooperation, so we first invented a multi-layer security design based on the power battery system security control technology, through the inclusion of mechanical, electrical, battery three-tier security architecture design and security detection, security diagnosis and control technology integration, to solve Power battery system safety monitoring and control problems." At the same time, the researchers also invented the state recognition technology for power battery system based on multi-sensor information fusion. That is, by establishing a non-linear time-varying battery system model and automatic identification method of model parameters, the problem of large estimation error of power battery system was solved. This technology reduces battery power display error from 8% to 5%." In recent years, the phenomenon of spontaneous combustion has occurred in some brands of electric vehicles, causing people to discuss whether electric vehicles are safe or not. So, how to ensure the safety of the battery pack in the event of a collision? Ren Yong said that this is also a problem that this technology needs to solve. "An important invention in this technology is to quickly insulate and shut down the battery under dangerous conditions." He said that they invented the high-voltage system insulation detection and verification technology based on the pulsed voltage divider method, in the event of a collision, the battery The system will first alarm, and then quickly cut off the relay to turn off the power, and the battery system 300 volts of high voltage is broken down into low voltage, reducing the risk of explosion and combustion, "from the alarm to cut off the power less than 1 second, while the past Technology takes at least 6 seconds." The non-woven perforated needle roller developed and designed by the company adopts imported alloy steel wire needles with high strength and good abrasion resistance. The processing accuracy has reached the same level in the world, and the air permeability detection is uniform and stable.
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