Prediction method of flexible-packaging lithium-ion battery packaging stress

Abstract

The invention belongs to the field of mechanical design and provides a prediction method of flexible-packaging lithium-ion battery packaging stress. The prediction method includes five steps of firstly, determining a battery temperature profile; secondarily, determining a cell gas-generation model; thirdly, determining a packaging mechanical property degradation model; fourthly, determining a packaging stress model; fifthly, predicting the packaging stress. The status of only the packaging safety performance testing methods exist at present is changed, increase of gas generation, degradation of packaging material performance, increase of volume and the like of the flexible-packaging lithium-ion battery which are caused along with time change are all taken into consideration, the curve, changed along with time, of the obtained stress value can be achieved, the stress value at different time interval can be predicted, and thus, a powerful support for the mechanical design of the flexible-packaging lithium-ion batteries is provided.

Description

technical field [0001] The application belongs to the field of mechanical design, and in particular relates to a method for predicting packaging stress of a soft-pack lithium-ion battery. Background technique [0002] The mechanical design of lithium-ion batteries generally refers to designing the shape, structure and packaging materials of lithium-ion batteries through historical information and engineering experience to meet various user needs. Accurate mechanical design of lithium-ion batteries plays a very important role in the improvement of design schemes, feasibility analysis, life cycle cost estimation, and maintenance support plan arrangements. [0003] The traditional mechanical design method of lithium-ion battery mainly adopts the method of protective case design and naked packaging experiment verification. In this method, a protective shell is designed according to the installation environment of the lithium-ion battery, the lithium-ion battery is placed in it ...

AI Technical Summary

Problems solved by technology

However, the traditional mechanical design method does not take into account the increase in packaging stress caused by internal changes in the lithium-ion battery during use, nor does it quantify the mechanical design of the packaging.

In addition, the change of the stress mode caused by the different packaging materials of the soft-pack lithium-ion battery is not considered in the traditional design method at all.

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