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 …

1.Introduction As a broadly applied power source for portable devices,lithiumion battery has advantages of high energy density, no memory effects, long cycle life, being environmental friendly,etc. After small lithium-ion batteries are dominant in the consumer electronies area, large lithium-ion batteries are developed, marching into automobile and power grid applications.   The application of lithium-ion battery …

(3) Thermal abuse Thermal abuse refers to the simulation of improper battery use under high temperature, such as placing mobile phones in sun exposed cars, or placing mobile phones or electronic products in microwave ovens. The external heat source directly acts on the lithium battery, causing complex internal chemical reactions, such as the decomposition of …

Lithium ion battery has the advantages of high specific energy, high voltage, long cycle life and low self discharge. It has become one of the main power supplies for portable electronic products such as mobile communication, notebook computers and electric tools. However, under misuse conditions (such as heating, overcharge, short circuit, vibration, extrusion, etc.), lithium-ion …

3.Research on T6 Test Method For T6 test, due to the diversity of existing lithium battery types, it is necessary to select different test methods for different types of lithium battery cells. During the research of the lithium battery working group of the United Nations Transportation Expert Committee, the test methods such as crush, nail …