Lithium ion battery electrode multi-phase multi-scale modeling method and system

Abstract

The invention provides a multi-phase multi-scale modeling method and system for a lithium ion battery electrode, and belongs to the technical field of computer simulation of a lithium ion battery, and the method comprises the steps: calculating the average porosity and tortuosity of a carbon glue phase region; scanning the lithium ion battery electrode sample layer by layer through X ray-CT to establish a three-dimensional geometric reconstruction model; representing the electrochemical reaction rate of the surface of the active material phase by using a reaction kinetic model; establishing a lithium ion transmission equation and a liquid phase potential field equation of an electrolyte region by applying a concentrated solution theory; characterizing a solid-phase potential field on the active material and the carbon glue phase region by adopting an Ohm law; the diffusion coefficient and the conductivity are corrected according to the average porosity and the tortuosity of the carbon gel phase; establishing a concentration field corresponding to substance diffusion in the active material according to the solid phase model; and further, carrying out numerical solution on the model to obtain parameters of the lithium ion battery electrode. According to the method, the accuracy and the efficiency are balanced.

Description

technical field [0001] The invention belongs to the technical field of computer simulation of lithium-ion batteries, and more specifically relates to a multi-phase and multi-scale modeling method and system for lithium-ion battery electrodes. Background technique [0002] As a new generation of energy technology, lithium-ion batteries have the advantages of greenness, cleanliness, high efficiency, energy saving, and low cost of use. The lithium-ion battery system has complex characteristics of multi-phase, multi-scale, and multi-physics field (electrochemical, thermal, electrical, and force) coupling. Product performance is affected by many factors such as material preparation, structural design, manufacturing process, and use conditions. The work is tough. The traditional battery research and development method relying on trial and error experience has disadvantages such as high cost, long cycle time and poor effect, which can no longer meet the current development needs o...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a multi-phase multi-scale modeling method and system for lithium-ion battery electrodes, aiming at solving the problem that the existing lithium-ion battery simulation method adopts FIB-SEM or computer random generation There is a competitive relationship between the resolution of the three-dimensional reconstruction equipment and the available sample size, as well as the accuracy and efficiency of numerical calculations, so that the simulation method of lithium-ion batteries cannot achieve high accuracy. balance between efficiency and

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