2.2 Different needle punching speeds The loading speeds are set to 1 mm/min, 5 mm/min, 10 mm/min, and 20 mm/min.   It can be seen that the ultimate load increases with the increase of speed, and the maximum average ultimate load is 1.56 kN (20 mm/min). When the loading speed of the sample increases from …

The compression of power batteries by sharp objects is the main form of damage caused by car collisions, and it is also a very severe working condition. In severe cases, lithium-ion batteries can explode, causing damage to electric vehicles and even personal injury.   In order to reveal the safety performance of lithium-ion batteries under …

With the rapid expansion of the electric vehicle market, problems related to electric vehicles are becoming increasingly prominent, and one of the most serious problems is the long charging time, so the demand for fast charging is becoming increasingly urgent. In addition, to meet the needs of some cold regions, the low-temperature performance of batteries …

Salt spray test is an environmental test that mainly uses the artificial simulated salt spray environmental conditions created by salt spray testing equipment to assess the corrosion resistance of products or metal materials. Compared with the natural environment, the salt concentration of chloride in its salt spray environment can be several times or tens of …

The constant temperature and humidity test chamber is a highly precise testing equipment that can perform constant humidity and temperature performance testing on products under simulated natural environmental conditions to evaluate their performance, stability, and durability.   1 Composition of the system The equipment consists of five major systems, including control system, refrigeration system, heating …

Walk-in environmental chamber is a device used to test and determine the performance of electrical, electronic, and other products and materials in high, low, or constant temperature environments. This type of device is widely used in fields such as aviation, automobiles, home appliances, and scientific research, and can simulate various extreme environmental conditions to evaluate …

Due to limitations in materials, battery technology, and manufacturing processes, lithium-ion batteries have always faced significant fire risks during use. The safety of lithium-ion batteries under collision and compression has always been a focus of attention.   In general, fires caused by external forces in lithium-ion batteries are fundamentally caused by internal short circuits due …

3 The impact of materials Generally speaking, the thermal stability of battery materials is an important factor in the safety of lithium-ion power batteries. This is mainly related to the thermal activity of battery materials. When the temperature of the battery rises, many exothermic reactions occur inside the battery. If the generated heat exceeds the …

Lithium ion batteries are the latest and fastest commercialized high-performance batteries. Lithium ion batteries are currently widely used as new energy sources in various fields due to their unique advantages. Lithium ion batteries have the characteristics of high voltage, high specific energy, and good cycling performance, and are increasingly being used in the 3 C …

Lithium batteries, especially lithium-ion batteries, have been widely used in various fields. Although lithium-ion batteries have developed rapidly and are widely used, if safety issues arise, the consequences will be very serious. Early lithium batteries used metallic lithium in the negative electrode, which was prone to lithium dendrites and even corrosion during charging. This significantly …