A thermal simulation analysis method for lithium-ion battery with multi-layer sheet structure

Abstract

The invention discloses a thermal simulation analysis method of a lithium ion battery of a multi-layer flaky structure. The method includes the steps of (1) preparing a battery sample and measuring electrical property data at different environment temperatures, (2) building a finite element battery solid model of a multi-layer structure and carrying out mesh dividing, (3) carrying out material property endowment and adding boundary conditions and initializing conditions of the finite element battery model, and (4) putting a battery in a heat-insulated environment and carrying out a heating experiment and a discharging experiment to achieve key parameter revision and calculation result verification of a thermal simulation analysis model. According to the thermal simulation analysis method of the lithium ion battery of the multi-layer flaky structure, experimenting and finite element modeling are organically combined, by means of a parametric model mode, every diaphragm, positive and negative pole active substance layers and a metal foil layer of the finite element model are all available, experiment results can be used for revising calculation results, and accordingly calculation precision is further guaranteed.

Description

technical field [0001] The invention relates to a battery thermal simulation analysis method in the technical field of lithium-ion power batteries, in particular to a thermal simulation analysis method for a lithium-ion battery with a multi-layer sheet structure. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high output power, long service life, and environmental protection. At present, they have firmly occupied the absolute dominant position in the power supply of mobile consumer electronics products, and their application fields are constantly expanding. Among them, the most anticipated is as a power source for electric vehicles. However, since the power performance, service life and even safety performance of lithium-ion power batteries are closely related to the battery temperature, the long-term high-current discharge of the battery during the driving of an electric vehicle is bound to have a significant impact on ...

AI Technical Summary

Problems solved by technology

The well-known thermal simulation analysis technology for lithium-ion batteries is often limited by the richness of model parameters and the complexity of model establishment, which greatly simplifies the battery structure and ignores the existence of dozens or even hundreds of layers of pole piece structures inside the battery. The independence of the battery cannot fully reflect the obvious differences in the physical properties and thermal characteristics of various materials such as metal materials, non-metallic inorganic materials and organic materials inside the battery, and it cannot accurately analyze the active material layer and the positive and negative current collectors inside the battery. It is also difficult to effectively form a closed feedback loop of "parameter test-simulation analysis-measurement verification and model correction" such as the thermal condition of any subtle structural details. Therefore, not only the validity of the simulation analysis model itself needs to be improved, but also the Unable to provide sufficient and rich reference information for battery R&D and designers

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