Research On The Thermal Effect Of Soft Carbon Anode Lithium-ion Battery Based On The Three-dimensional Electrochemical-thermal Coupling Model

With the progress of science and technology,human life has undergone earth-shaking changes,these changes have good aspects,there are also in need of improvement.With the advent of the internal combustion engine and fuel-powered cars,the environmental protection problem is increasingly serious.In today's society,the energy crisis and environmental pollution have become an international issue and the most serious and intractable problem in today's society.We must face the challenge,come up with ways to solve this problem,also accord with the requirement of today's national policy in our country,in comply with general secretary xi jinping's "green water and green mountains are mountains of gold and silver" concept.Therefore,the development of battery energy has become a major research direction.More and more types of batteries have emerged,and the size and performance requirements of batteries are becoming stricter.The preparation of high-performance batteries to meet the use of different electrical equipment is an important task in the current society,and the lithium-ion battery is the brightest current development prospects,and is one of the more mature batteries developed so far.The advantages of non-pollution,excellent electrochemical performance,and long service life of lithium-ion batteries make lithium batteries the most promising battery in the current development,but their development is not yet mature,and there are some development shackles that affect battery performance most.The important factor is the battery positive and negative materials.Through the development of a new type of lithium battery negative material,a new micro-nano composite structure mesophase spherical soft carbon(SMSC).Perform physical and electrochemical characterization tests on the prepared new materials.The results show that the material has good physical properties and excellent electrochemical properties.Use the prepared SMSC material as the negative electrode material for lithium batteries,prepare a new negative electrode material for lithium batteries,conduct electrochemical performance tests on the new lithium batteries,perform discharge tests at different rates,cyclic discharges,and discharges in high and low temperature environments.The experimental results show that the new lithium battery has good electrochemical performance and low cost,and can be used for commercialization.Through the COMSOL software,a three-dimensional electrochemical-thermally coupled lithium-ion battery model is built.Through software simulation,the changes and distribution of the internal and external temperature fields of the lithium battery during the discharge of the lithium battery at different rates are analyzed,and the source of heat generation is analyzed.Distribution.Relevant results obtained through simulation can provide a theoretical basis for the design of lithium batteries,and also provide safety warnings for users in the process of using the battery.