Testing Chambers Knowledge

With the popularization of electric vehicles and the continuous expansion of market share, safety issues have also become one of the focuses of consumer attention.  Especially the frequent occurrence of electric vehicle spontaneous combustion has attracted widespread attention and discussion in society. The occurrence of these events not only brings concerns to consumers, but also attracts the attention of car manufacturers and battery suppliers.   In general, the spontaneous combustion of electric vehicles is not an accidental event, but is caused by multiple factors.  Firstly, there are production defects in the battery itself, such as unreasonable internal structure and non-standard production process. These defects may cause internal short circuits in the battery cells, leading to spontaneous combustion accidents.  Secondly, external factors are also an important reason for the spontaneous combustion of electric vehicles. During the use of batteries, they may be ...

  With the rapid development of new energy vehicle industry, the power battery of electric vehicles is prone to Thermal runaway due to its own characteristics and use environment.  Thermal runaway will cause thermal damage to the power battery, leading to auto ignition and even explosion. Therefore, it is of great significance to analyze the causes of Thermal runaway of electric vehicle power batteries and propose preventive measures.  At present, the main reasons for Thermal runaway of electric vehicle power battery are as follows:   1) overcharge, overdischarge and overload; 2) External short circuit, internal short circuit; 3) Reduced insulation; 4) Thermal runaway of electric core.   Among them, internal short circuit and Thermal runaway of battery cell are the main reasons for Thermal runaway of electric vehicle power battery.  In order to reduce the Thermal runaway of electric vehicle power battery, this paper analyzes from four aspects: overcharge, o...

  In recent years, electric vehicles have achieved unprecedented development, and countries are actively carrying out related research work. In civilian vehicles, major automobile manufacturers continue to introduce technologically advanced hybrid electric vehicles and pure electric vehicles.  On Military vehicle, many countries have also carried out a lot of research work. Compared with mechanical transmission vehicles, military electric vehicles have the following advantages: convenient power system layout; The vehicle is easy to start and accelerate; Can achieve silent driving with good concealment; Can provide high-power power supply for vehicle mounted weapon systems; Can absorb regenerative braking energy, etc.   The United States, Germany, Britain and other countries have successively launched military electric vehicles such as electric armored vehicles and Infantry fighting vehicle. In the rapid development of electric technology, some issues have also become prom...

  In recent years, electric vehicles have developed rapidly, and as a key component of electric vehicles, power batteries have also undergone rapid technological development. The performance and service life of power batteries directly determine the performance and cost of electric transmission vehicles.  At present, the main power batteries used in electric drive vehicles are lead-acid batteries, Nickel–cadmium battery, Nickel–metal hydride battery, lithium ion batteries and supercapacitor batteries. Lithium ion power batteries have gradually replaced lead-acid batteries, Nickel–cadmium battery and Nickel–metal hydride battery as the main power batteries for electric drive vehicles because of their advantages such as high specific power, large energy density, long life, low self discharge rate, long storage time and no pollution.   The power battery used in electric vehicles is composed of multiple battery cells arranged in series and parallel to form a battery pack. The...

  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....