Testing Chambers Knowledge

  Energy and environment are the two fundamental issues facing sustainable development in the world today. Hybrid electric vehicles, as a green and efficient means of transportation, have been increasingly promoted worldwide.  With the increasingly mature battery preparation technology, the Lithium iron phosphate power battery, as an important part of the hybrid electric vehicle drive system, has a significant impact on the vehicle power, economy and safety.  Because of its high energy density, long life, high charging and discharging efficiency, wide applicable temperature range, low self discharge, low internal resistance, no memory effect, fast charging, high safety, high reliability, low cost and reusability, it is recognized as the most promising vehicle power battery.   However, in the actual use of power battery, Lithium iron phosphate material has a high impedance, which directly affects the promotion and application of Lithium iron phosphate power battery....

  Lithium iron phosphate battery is a very potential lithium-ion battery in the current market. At present, the research on Lithium iron phosphate battery mainly focuses on Battery management system and state of charge estimation.  Its performance needs further research, especially its low-temperature performance. At present, the discarded equipment used for Antarctic scientific research is basically powered by Lead–acid battery, which causes serious pollution.   However, the specific power and specific energy of Lithium iron phosphate battery are higher than those of lead-acid batteries, with low self discharge rate and environmental protection, and they are more suitable for Antarctic.  The perennial cold gale in Antarctic, such as the Kunlun Station, which is located at the highest altitude in Antarctica, has an annual average temperature of -58.4 ℃ and a minimum temperature of -82 ℃.  This paper simulates the Antarctic low-temperature environment, conducts c...

  During the battery production process, due to negligence in process control, extremely small metal particles were mixed inside the lithium-ion battery.  During battery use, temperature changes or various impact metal particles pierced the separator between the positive and negative electrodes, causing a short circuit inside the battery and causing a large amount of heat, causing the battery to catch fire.   Due to the accidental inclusion of metal particles during the production process, it is difficult to completely prevent such incidents from occurring. Therefore, we attempt to simulate the situation where metal particles penetrate the separator and cause internal short circuits through the “forced internal short circuit test”.   If lithium-ion batteries can ensure that there is no risk of fire or explosion during the test process, it can effectively ensure that even if metal particles are mixed inside the battery during the production process, they cannot penetr...

  With the development of the automobile industry, Alternative fuel vehicle have become a force that cannot be ignored in recent years. With the increasing use of new energy vehicles, we often see news about the spontaneous combustion, explosion and other aspects of new energy vehicles.  The essence of new energy vehicle safety accidents is actually battery Thermal runaway. This paper briefly introduces the status quo of Thermal runaway, existing problems, problems to be solved, and technical measures and methods to be taken.   1 Thermal runaway Thermal runaway refers to the phenomenon of overheating, fire and explosion caused by the heat release chain reaction of the single battery, which causes the rapid change of the self temperature rise rate of the battery.   2 Existing problems With the continuous improvement of energy density of lithium-ion batteries, improving their safety is increasingly urgent for the development of electric vehicles. In practice, how to ac...

  Lithium batteries are one of the indispensable power sources in today’s aerospace industry, often serving as backup energy for various aircraft equipment startup, communication, and emergency response. They are important components of aerospace vehicles. However, in normal operation, lithium batteries are very sensitive to environmental temperature, and the impact of temperature is crucial during the battery’s cyclic use, but it is easily overlooked.   The battery capacity and charging and discharging characteristics will change with temperature, and high or low temperatures will seriously affect the performance and service life of the battery. Due to the long-term operation of aviation cobalt acid lithium batteries in unfavorable environments such as low voltage and low temperature, this will inevitably lead to a shortened cycle life of lithium batteries, which can seriously lead to battery scrapping or unpredictable losses. Therefore, it is necessary to study the temperatu...