Thermal diffusion joint simulation method for power battery system based on star CCM+ and Amesim

Abstract

The embodiment of the invention discloses a thermal diffusion joint simulation method for a power battery system based on star CCM+ and Amesim. The method comprises the following steps: performing contact interface processing on a three-dimensional simulation model of a power battery system by utilizing finite element preprocessing software and generating a surface grid; importing the surface gridgenerated in the pre-processing step into star CCM+ software to carry out region division, and setting grid parameters to generate a volume grid; setting corresponding material attributes for different regions of the power battery system body grid model, and setting 'collaborative simulation' operation in the material attributes of the power battery system three-dimensional simulation model; building a control module, conducting parameter calling, and checking a simulation result. According to the method, a complete system thermal expansion model is finally formed by combining a star CCM+ heat transfer model and an Amesim control model, so that the simulation precision of the model can be ensured, the calculated amount is greatly reduced, the thermal diffusion state of the battery systemis better predicted, corresponding protection measures are put forward, and the safety of the electric vehicle is improved.

Description

technical field [0001] The invention belongs to the field of power battery safety, and in particular relates to a simulation analysis method for thermal diffusion of a power battery system. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, low self-discharge rate and long life, so they are widely used in new energy electric vehicles. However, spontaneous combustion accidents of electric vehicles characterized by thermal runaway of lithium-ion batteries emerge in endlessly, which limits the development of electric vehicles to a certain extent. In order to improve the safety of electric vehicles and slow down or even avoid the phenomenon of thermal runaway of lithium-ion batteries, major research institutions have conducted very in-depth research on thermal runaway. At present, the research on thermal runaway is still limited to the single battery level, and the simulation analysis of thermal diffusion behavior at the system...

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Problems solved by technology

At present, the research on thermal runaway is still limited to the single battery level, and the simulation analysis of thermal diffusion behavior at the system level is limited by the simulation method, so few people have studied it.

Therefore, the research results on thermal runaway are difficult to achieve engineering applications, and cannot provide effective solutions for the safety improvement and safety protection of electric vehicles

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