Construction method and simulation method of electrochemical model of lithium ion battery

Abstract

The invention discloses a construction method and a simulation method of an electrochemical model of a lithium ion battery. In the construction process of the electrochemical model, the diffusion process of lithium ions in an electrolyte, the diffusion process of the lithium ions from the inside to the surface and from the surface to the inside of an active material, the potential distribution of the electrolyte, the potential distribution of the active material, the lithium ion intercalation and deintercalation reaction process and the distribution state of the active material in a two-dimensional space are considered; that is to say, the electrochemical model introduces the mesoscopic morphology of the positive electrode and the negative electrode into the model, and refines the lithium ion exchange of the solid and the liquid to the boundary condition, and the lithium ion exchange occurs at the solid-liquid junction. after the electrochemical model is used for simulation, the obtained simulation result better conforms to the characteristics of the lithium ion battery, the simulation result is more accurate and reliable, and therefore, reliable reference can be provided for follow-up analysis and application of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a construction method and a simulation method of an electrochemical model of a lithium ion battery. Background technique [0002] The electrochemical model of lithium-ion batteries is generally a P2D (Pseudo-two-dimensions, quasi-two-dimensional) model. This model simplifies the positive and negative electrodes, and only considers the porosity and curvature of the positive and negative electrodes. After the electrochemical model is simulated, the accuracy of the simulation results is low. Contents of the invention [0003] The embodiment of the present invention provides a construction method and a simulation method of an electrochemical model of a lithium-ion battery, which are used to construct a new electrochemical model. The electrochemical model considers the mesoscopic morphology of the positive and negative electrodes, so that based on the After the chemical model is ...

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Problems solved by technology

[0002] The electrochemical model of lithium-ion batteries is generally a P2D (Pseudo-two-dimensions, quasi-two-dimensional) model. This model simplifies the positive and negative electrodes, and only considers the porosity and curvature of the positive and negative electrodes. After the electrochemical model is simulated, the accuracy of the simulation results obtained is low

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