Method and system for nondestructively detecting laminated lithium ion battery

Abstract

The invention provides a method and a system for nondestructively detecting a laminated lithium ion battery. The method comprises the following steps: sequentially emitting X-rays to every layer of cell electrode sheets of the laminated lithium ion battery, wherein the incident direction of the X-rays is parallel to the every layer of cell electrode sheets of the battery to be detected, and the X-rays scan around the cell electrode sheets in different directions; sequentially acquiring the intensities of the X-rays emitted from different directions and encircling the every layer of cell electrode sheets before and after penetrating the every layer of cell electrode sheets and the thickness of the every layer of cell electrode sheets; and determining the attenuation coefficient of the X-rays at each point on the every layer of cell electrode sheets according to the acquired intensity of the X-rays and the thickness of the every layer of the cell electrode sheets, and generating a two-dimensional image of the every layer of cell electrode sheets and a three-dimensional image of the laminated lithium ion battery. The method scans the cell electrode sheets of the laminated lithium ionbattery based on an X-ray tomography technology to realize the online monitoring of the state of the battery.

Description

technical field [0001] The invention relates to the field of non-destructive testing of lithium-ion batteries, and more particularly, to a method and system for non-destructive testing of laminated lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long service life, high rated voltage, and good rate performance. They not only develop rapidly in the field of portable electronic products, but also have been widely used in large-scale energy storage and new energy vehicles in recent years. However, frequent battery-related safety accidents at home and abroad have drawn people's attention to battery safety and reliability issues, and it is increasingly urgent to carry out analysis and research on lithium-ion battery performance degradation and battery safety issues. [0003] The commonly used test and analysis methods for lithium ion failure mechanism research are divided into destructive testing and nondestruc...

AI Technical Summary

Problems solved by technology

However, this method has obvious disadvantages such as large sample size, long research period, and complicated operation procedures.

Moreover, this method of dismantling and analysis interrupts the reaction process of the battery, making it difficult to continuously detect the law of battery performance degradation during the aging process, and cannot directly and intuitively observe the changes inside the battery. Only through the analysis and combination of test data, Speculate on the internal changes and reaction mechanism of the battery, and it is impossible to monitor the battery performance on-line while the battery is in use or without destroying the battery

[0004] Therefore, under the premise of not destroying the battery, non-destructive testing of the battery is very important for efficient and intuitive monitoring of the real-time internal state of the battery and accurately reflecting the reaction mechanism of battery failure. Detection methods and systems

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