The safety of lithium ion batteries refers to their ability to suppress initial external disturbances and cause unsafe behavior during normal use or abuse. Cylindrical lithium ion batteries have a higher specific energy, and the battery shell is made of steel. When the battery experiences abnormal heat loss, the internal heat of the battery accumulates, …

Due to the limitations of materials, battery technology, and manufacturing processes, lithium ion batteries have always had a significant fire risk during their use. The safety of lithium ion batteries under collision and crush has always been a focus of attention.   Generally, the fundamental reason for a fire caused by external forces on a …

As lithium-ion batteries are widely used in aviation, aerospace, new energy vehicles and other fields, their safety risks and problems in the process of use are increasingly prominent. Especially under abuse conditions (such as high temperature, short circuit, overcharge and discharge, vibration, extrusion and impact, etc.), they are prone to smoke, fire and even explosion. …

Lithium-ion batteries are widely used in new energy vehicles. In recent years, the explosion accidents of new energy vehicles have caused widespread concern and attention to their safety. Lithium-ion batteries may burn and explode under extreme conditions such as overcharge, collision and high temperature, and it is very difficult to put out.   1.Analysis of …

1.5 Nail Penetration The nail penetration test evaluates the safety of the battery by penetrating the steel needle through the sample at a certain speed. The steel needle passes through the battery, damaging the integrity of the electrode and diaphragm, resulting in a short circuit in the battery and continuous heat generation. The severity level …

In recent years, countries around the world have continuously increased policy support for new energy vehicles, and car companies such as Tesla have also launched new models. It has led to the rapid growth of the global electric vehicle market. However, the fire and explosion accidents of electric vehicles have occurred many times, making the …

3.Comparison and analysis of nail penetration thermal runaway test Comparing the results of the six groups of tests, the batteries were damaged, but the severity of the tests was different. According to the different experimental characteristics, the experimental characteristics of nail penetration can be divided into three categories.   Category I: For example, the batteries …

In recent years, the global energy crisis and environmental pollution have become increasingly serious. As a clean and pollution-free energy storage, lithium-ion batteries are gradually applied to new energy vehicles, solar energy conversion energy storage equipment, mobile communication equipment and other fields. At present, new energy vehicles with lithium-ion batteries appear in more and more …

1.Safety of lithium-ion battery under overheating condition The safety problems of lithium-ion batteries are mainly manifested by fire and explosion caused by uncontrolled heat. The causes of thermal runaway can be divided into external conditions and internal conditions. The internal temperature of the battery also keeps rising when the external temperature keeps rising. When the …

1.Classification of thermal runaway accident triggering There are many triggering reasons for the thermal runaway accident of lithium-ion power battery. According to the characteristics of triggering, it can be divided into three categories: mechanical trigger, electrical trigger and thermal trigger. The three types of trigger forms have certain internal relations. Generally, mechanical trigger will cause …