Analysis of temperature characteristics of lithium-ion power lithium-ion battery

Analysis of temperature rise characteristics of lithium-ion power lithium-ion batteries Abstract: With the rapid development of lithium-ion power lithium-ion batteries, their safety performance has attracted more and more attention. Among them, heat is one of the important factors affecting battery safety performance. In order to study the heat dissipation process of the battery, according to the temperature rise of the lithium-ion power lithium-ion battery, the discharge data is simulated and calculated by the nickel-cobalt-manganese ternary material and the lithium iron phosphate battery and the equivalent specific heat capacity of the lithium iron phosphate battery of different models. The results show that two aspects of the battery and battery processing materials of the battery structure have an impact on the equivalent specific heat capacity and battery temperature data. The temperature rise of the ternary material battery is faster than that of the lithium iron phosphate battery. The large size of the battery cooling system has a difference in length and temperature. Rise faster. This conclusion provides a basis for the battery manufacturing process and material selection, and provides data support for improving the safety performance of lithium batteries, and has a profound and meaningful impact on the development of lithium batteries. [Keywords] lithium-ion power lithium-ion battery; equivalent specific heat capacity; material selection; battery structure; battery temperature rise lithium battery has the advantages of small size, high voltage, large capacity, good cycle performance, no pollution, no memory effect and so on. In recent years, it has developed rapidly in domestic and foreign markets and has become a new generation of rechargeable batteries after nickel-hydrogen batteries. Lithium batteries have broad application prospects in electronic components, electric vehicles, aerospace and other fields. Lithium batteries, especially lithium-ion power lithium-ion batteries, work in the form of battery packs during use, and individual batteries are in a densely packed state. Therefore, the heating problem of the battery has always plagued people, and the safety problem of the lithium battery has been hindering the development of the lithium battery. During use and storage, due to the battery material, structure, and different working conditions, the heat generated by different levels of lithium ions cannot be lost in time, resulting in the accumulation of internal heat and temperature rise, leading to a series of self-heating inside the battery These secondary uses will accelerate the increase of cell temperature, which will eventually lead to thermal runaway of the battery and cause potential safety hazards. Therefore, studying the heating and heat dissipation performance of the battery is of great significance to the safe use of the battery, and it is also of great significance to the optimal design and health management of the battery structure. The influence of battery materials on the specific heat capacity of batteries At present, the safety problems caused by the heating of lithium batteries have had a great negative impact on consumers, restricting the development of lithium batteries. The choice of electrode material determines the thermal capacity of the battery to a certain extent. The thermal stability of a lithium battery is the result of the coordinated use of the electrode material itself and the material. By comparing the heat capacity of the ternary material of nickel cobalt manganese battery and lithium iron phosphate battery, you can find that the safety performance of ternary battery is not as good as lithium iron phosphate battery to a certain extent, and the unit cost and superiority of ternary battery watt-hour It is based on the voltage platform of lithium iron phosphate battery, but its safety factors seriously affect the use and development of the battery. Therefore, reducing the temperature rise of the ternary battery and optimizing the battery cooling system have far-reaching significance for the development of the ternary battery. The choice of battery material determines the safety performance and even the service life of the battery to a certain extent. Therefore, the battery cost, voltage and temperature rise effects should be considered comprehensively when selecting battery materials. The influence of battery structure on battery specific heat capacity The temperature rise of lithium battery is the result of battery heating, heat conduction and thermal diffusion. The structure of the battery directly affects the heat conduction and heat diffusion of the battery, thereby affecting the temperature rise of the battery during operation. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How about the performance of lithium iron phosphate battery as an electric vehicle battery?