Analysis of the principle of thermal conduction of lithium batteries

The principle characteristic of heat conduction of lithium battery refers to the characteristic shown by the whole process of the heat appearing in the battery, passing through the battery shell, and finally dissipating to the outside air. According to the internal structure of the lithium battery and the basic principles of heat transfer, it can be known that the heat generated by the reaction of the battery is transferred inside the battery by heat conduction, and the heat will eventually reach the surface of the battery. Due to the temperature difference between the surface temperature of the battery and the ambient temperature, the temperature High objects transfer heat to objects with low temperature, so the surface of the battery conducts convective heat exchange with the outside world, and because objects with high temperature can generate electromagnetic waves to the surroundings, the surface of the battery also conducts radiation heat exchange at the same time. (1) Heat conduction Heat conduction refers to the heat transfer between materials or the materials themselves under the condition that there is a temperature difference in the system and the materials in the system do not move relative to each other. It occurs inside the battery, the electrolyte, electrodes, diaphragm and battery casing inside the battery. Etc. are all conductors, conducting heat conduction, and heat conduction obeys Fourier's law. (2) Thermal convection Thermal convection refers to the solid in the fluid medium. Due to the temperature difference between the two, heat exchange will occur. It occurs on the surface of the battery. Convection occurs between the surface of the battery and the gas or liquid flowing through the surface of the battery. Heat transfer. (3) As long as the temperature of the heat radiation object is higher than the absolute temperature, heat radiation will occur. When heat radiation occurs between objects with different temperatures, heat can be transferred. The higher the temperature, the more heat is transferred. Therefore, the surface of the lithium battery is undergoing convection. The heat is radiated and exchanged at the same time. The heat radiation follows the Stefan-Boltz-mann law. From the law, it can be seen that the size of the radiant heat is related to the surface material and area of u200bu200bthe object, and the absolute temperature difference between the two And so on. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Will charging the mobile phone battery for a long time explode? How to guard against mobile phone battery accidents