The industry's research on low-temperature-resistant lithium batteries

Companies and scientific research institutions in the industry are investigating and tackling the low-temperature resistance of batteries, focusing on the improvement of the existing positive and negative materials, and the local environmental temperature of the battery has been improved to create conditions for the battery to operate at low temperatures. The current battery materials are moving toward nanometer, and the particle size, electrical resistance, and the axis length of the AB plane will affect the low-temperature characteristics of the battery. Waterma prepares lithium iron phosphate materials through three processes, and chooses different processes to nanoize and coat them. The results show that the increase in the axis length of the AB plane makes the lithium ion migration channel larger, which is conducive to improving the battery rate Function; From the data produced by the three processes, the granular graphite with a large interlayer spacing has relatively low bulk resistance and ion migration resistance; in terms of electrolyte, Waterma uses low-temperature additives on the basis of a fixed solvent system and lithium salt. The discharge capacity has increased from 85% to 90%. It is known that as early as the end of 2016, Waterma has completed charging at -20, -30, and -40°C with a constant current ratio of 62.9% at 0.5C and 94% at -20°C. At present, Waterma's low-temperature battery has been widely implemented in Inner Mongolia, the three northeastern provinces and other regions. On August 31, the Beijing Institute of Technology and other scientific research teams announced the successful development of all-climate battery products. Skilled personnel use the principle of generating heat by energizing the metal wire, adding nickel foil to the battery cell, and the nickel foil is energized to generate heat, which increases the internal temperature of the battery. After reaching a certain temperature, the foil will automatically disconnect to ensure battery safety. It is known that in a test environment of -30°C, using a battery with this technology can quickly heat up to above 0°C in 30 seconds, the discharge power is increased by more than 6 times, and the charging power is increased by more than 10 times. Relevant personnel of the team stated that the technology does not change the original structure of the battery, and the transformation cost is extremely low, and it is suitable for various types of batteries such as lead-acid batteries and lithium batteries. According to the Battery my country Network, the all-climate electric vehicle using this technology will be announced at the end of December 2017. It is expected that the development of 11 product prototypes of 4 models will be completed in 2020, and demonstration operations will begin. According to media reports, at the 2017 Maker my country Xinjiang Innovation and Entrepreneurship Competition that closed on September 20, the all-climate lithium battery developed by Dr. Wang Lei from the Xinjiang Institute of Physics and Chemistry of the Chinese Academy of Sciences won the first prize in the maker group. It can work stably in the environment of -40℃~60℃. At present, the team has completed various product detection operations under high and low temperature conditions, and is about to enter the stage of commercial product production. On September 19, 2017, 70 12-meter gas-electric hybrid buses equipped with Weihong MpCO lithium batteries were officially launched in Baotou, Inner Mongolia. The lowest temperature in this area is below -30℃, and the highest temperature can reach 39℃. Baotou chooses the Weihong fast charging battery system, which takes into account the excellent environmental adaptability of the Weihong fast charging battery. Shandong Weineng is a high-tech company specializing in the development and production of military low-temperature lithium iron phosphate batteries. The low-temperature function of the lithium iron phosphate battery developed and produced in cooperation with the Institute of Chemistry of the Chinese Academy of Sciences has completed a major breakthrough, and can release additional capacity at a low temperature of -40°C 90% of the total. In addition, Penghui Energy’s power lithium-ion battery can be used in an environment of -20~60°C without heating and cooling systems. Thornton New Energy's ternary low temperature resistance function has made great progress. The battery cell can be discharged normally at -20°C, which can satisfy the needs of many vehicle companies. Disclaimer: Some pictures and content of the articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Briefly describe the development prospects of lithium iron phosphate batteries