The importance of thermal stability to the safety of lithium batteries

In today's society, the level of human science and technology is at a stage of rapid development, but it will be constrained by the energy crisis in the development process, which requires new energy sources to emerge. At present, lithium-ion batteries have been widely used as an important energy source. Whether in the field of electronic communication or transportation, it plays an extremely important role and has broad application prospects. Lithium-ion batteries have many advantages, such as high specific capacity, long life, and no pollution in green. However, during use, lithium-ion batteries have also experienced some thermal safety problems, which also affect its wider use in more fields.

The study found that the cause of thermal runaway or even combustion and explosion of lithium-ion batteries is mainly due to the charging of large currents of the battery, or the violent impact or extrusion during use. Therefore, it is very meaningful to study the thermal safety of lithium-ion batteries and analyze the temperature distribution and changes of batteries during charge and discharge. It is very meaningful to predict and evaluate the reliability of lithium-ion batteries and control their thermal safety.

In the process of learning, we need to understand the development trend of lithium-ion batteries and some problems in the application, especially the heat generation problems in the process of lithium-ion battery abuse and the safety hazards caused by certain analysis. Next, the classification, characteristics, working principle and composition of lithium-ion battery are studied and studied. The heating mechanism of lithium-ion battery is analyzed, which provides a theoretical basis for temperature field analysis of lithium-ion battery. Then combined with the classical theory of heat transfer, combined with the relevant knowledge of finite element, the appropriate thermal analysis method is selected, and the working process and heat problems of the solid lithium ion battery are abstracted according to the situation in the actual application process, regularization, formulation and preliminary selection of a thermal mathematical model of a Li-ion battery with generality and proper assumptions and simplifications.

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