Lithium battery pack thermal abuse safety risk assessment method based on multi-physics field simulation

Abstract

The invention relates to a lithium battery pack thermal abuse safety risk assessment method based on multi-physics field simulation, and the method comprises the steps: determining the configuration and geometric structure of a lithium battery pack, constructing a thermal abuse-oriented lithium battery pack multi-physics field simulation model and a thermal abuse safety assessment model, carrying out the sampling of random parameters, and calculating the thermal abuse safety risk of the lithium battery pack. And carrying out corresponding multi-physical field simulation and thermal safety analysis to obtain a thermal safety boundary and a thermal runaway delay period, carrying out distribution fitting on results, and carrying out thermal safety risk assessment based on a stress intensity interference model. According to the method, the influence of random uncertainty caused by the multi-field multi-cell coupling effect, the load working condition, the production process level, degradation and other factors on the thermal safety is considered at the same time, the thermal safety of the lithium battery pack can be accurately evaluated, and the thermal abuse safety boundary and the risk probability are given out.

Description

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AI Technical Summary

Problems solved by technology

[0005] However, there are still the following deficiencies: 1) the existing lithium battery thermal safety analysis methods are mainly aimed at single or single physical fields, and cannot fully and accurately evaluate the thermal safety of lithium battery

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