Method for establishing equivalent model based on CAE battery module connection structure

Abstract

The invention discloses a method for establishing an equivalent model based on a CAE battery module connection structure. The method comprises the following steps of: 1), establishing an accurate model of the battery module connection structure, and carrying out simulation tests of axial compression and radial overturning offset on the accurate model; 2) establishing an equivalent model, and performing the same simulation tests of axial compression and radial overturn offset on the equivalent model; and 3) comparing reaction force difference values of parallel elastic sheets in simulation tests of the two models, and adjusting anisotropic material parameters applied to series elastic sheet equivalent bodies in the equivalent model according to the difference values until the reaction forcedifference values of the parallel elastic sheets in the simulation tests of the two models are reduced to an ideal range. By adopting the method for establishing the equivalent model, simulation errors can be reduced in the later finite element simulation process, and the simulation efficiency of the battery connection structure and the whole pack of the battery connection structure can be greatly improved.

Description

technical field [0001] The present application relates to the battery field, in particular to a method for establishing an equivalent model of a battery module connection structure based on CAE. Background technique [0002] In recent years, with the strong support of the state, the new energy automobile industry has developed rapidly. The reliability of the internal module structure of the new energy battery pack has also become a hot spot of widespread concern, and the stiffness characteristics of the internal module connection structure and the input method during the finite element simulation process have always been one of the hotspots in the industry. [0003] At present, it is relatively complicated to use cylindrical batteries to assemble battery packs, especially the connection structure between two batteries is the most important part of the reliability of the battery module. At present, cylindrical batteries are mainly connected by eight-claw shrapnel (series shr...

AI Technical Summary

Problems solved by technology

In the finite element simulation process, due to the complex connection structure and many parts, it is impossible to calculate all the features in the modeling process, so the connection part needs to be equivalent to the corresponding structure to ensure the accuracy of the calculation And greatly improve its calculation efficiency, and from the experimental point of view, it is impossible to accurately and efficiently test the characteristic parameters of the link structure, so the simulation analysis must be carried out by means of CAE simulation to ensure the accuracy of the finite element analysis of the entire battery pack

[0004] The traditional method of battery pack CAE analysis connection structure is: In order to reduce calculation time and improve calculation efficiency, engineers often replace the quality of the module with quality points. The disadvantage of using this method is that the characteristics of the module cannot be accurately calculated. Mapped to the battery box, only the mass is distributed separately; another method is to simplify the mass block of the module and only provide the density, elastic modulus, and Poisson’s ratio parameters for the mass block, but the module The group is composed of components such as batteries, fixtures, and eight-claw shrapnel. The simplified material parameters must be anisotropic materials. Therefore, if only three parameters are used to replace anisotropic materials, the calculation error will inevitably increase, which is not conducive to Simulation calculation of battery pack

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