Method and device for testing structural strength of power battery module and storage medium

Abstract

The invention discloses a method and a device for testing the structural strength of a power battery module and a storage medium. The method comprises the following steps: establishing a finite element model of each structure in the power battery module, performing assembling according to an actual assembling relation, and defining a material of each part in the model; performing temperature expansion simulation on the single power battery to obtain the temperature rise of the single battery when the single battery reaches the target expansion force; applying a finite element model load: obtaining an expansion load in a single body through single simulation in the above steps, and applying the expansion load to the model in a temperature rise form; obtaining the pre-tightening force of a bolt; obtaining the pre-tightening force of a strap; applying finite element model boundary conditions; calculating a structural static strength safety coefficient; redefining elastic-plastic attributes of the parts in the finite element model; carrying out elastic-plastic finite element analysis, wherein calculation results comprise a stress result and a plastic strain calculation result; and judging whether the structural strength of the power battery module is qualified or not according to a calculation result. The structural strength of the power battery module under the expansive force working condition can be accurately predicted.

Description

technical field [0001] The invention relates to the technical field of power battery module strength detection, in particular to a method, device and storage medium for testing the structural strength of a power battery module. Background technique [0002] During the charging and discharging process of lithium-ion batteries, the chemical reaction of the internal cells will increase the pressure in the single shell, which will cause the expansion of the single cells of the cells. The expansion and extrusion between the cells cause deformation and stress, and this is also a more dangerous working condition for the strength performance of structures such as battery module end plates. In the product design process, two methods are usually used to obtain the strength performance of structures such as battery module end plates. One is the test method, which depends heavily on the state of test equipment and modules. Usually, the production process and assembly conditions of the...

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Problems solved by technology

Usually, the test sample and the mass production sample have large differences in production process and assembly conditions, and the test cycle is very long, resulting in a lag in performance verification, which cannot meet the needs of product development

The other is through simulation technology, but it is currently in the exploratory stage. Most of the finite element simulation processes have simplified the way the module and the expansion force act. Due to the different simplification modes, the simulation results are discrete. higher

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