Abstract
The electrochemical model can reflect the electrochemical reactions inside the lithium ion battery, and the model parameters have practical physical significance. Therefore, it is commonly used in the simulation research of the life prediction and the cell decay mechanism analysis of the lithium ion battery. This paper mainly introduces three commonly used electrochemistry models: P2D model, SP model and extended SP model. The origin and research progress of three kinds of electrochemical models are described. The characteristics of the three models are analyzed and compared. P2D model can describe the battery reactions comprehensively, but the iterative solution is complicated. The SP model simplifies some electrochemical reactions and improves the computational speed of the model, but the accuracy is decreased. In order to solve the shortcoming of SP model, the electrochemical reaction omitted from SP model is introduced again, and the approximate solution is solved by mathematical method, so as to realize the balance between precision and computational complexity of the model. Based on the above analysis and the application scenarios of lithium ion battery, the further development of the lithium ion battery electrochemical model is prospected.
Highlights
The environmental pollution aggravation, global warming, natural resources decreasing and other problems have prompted many countries in the world to conduct a lot of research on vehicles with alternative energy, so as to promote the development of new energy vehicles such as electric vehicles and plug-in hybrid electric vehicles
The electrochemical mechanism model can describe the macroscopic physical quantities such as voltage and current, and simulate the important microscopic physical quantities inside the battery[2], which is suitable for application in the degradation analysis and aging analysis of battery performance
The parameters in P2D model have physical meanings and can reflect the internal state of lithium ion battery during charging and discharging, which is suitable for the microscopic study of lithium ion battery
Summary
The environmental pollution aggravation, global warming, natural resources decreasing and other problems have prompted many countries in the world to conduct a lot of research on vehicles with alternative energy, so as to promote the development of new energy vehicles such as electric vehicles and plug-in hybrid electric vehicles. Compared with other types of commonly used power batteries, lithium-ion batteries have become a research hotspot due to their advantages such as high specific energy and power, long calendar life and cycle life, low cost, no memory effect, and low pollution[1]. The performance of lithium ion battery is affected by many factors. In order to simulate and predict the lithium ion battery behavior effectively, it is necessary to establish a reasonable model of lithium ion battery. The principle of lithium ion battery is introduced firstly, and the above three types of electrochemical models are analyzed. The prospect of lithium ion battery electrochemical model research is made
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