Lithium battery safety detection method

Abstract

The invention discloses a lithium battery safety detection method, comprising steps of transmitting a non-destructive detection ultrasonic signal by a lithium battery, wherein the detection ultrasonic signal penetrates and is reflected in the lithium battery, performing charge-discharge determination on the lithium battery, establishing a lithium battery charge conservation model, a quality conservation model and a electrochemical reaction dynamics model, establishing a thermal model in the working process of the lithium battery according to the electric performance and the electrochemical reaction of the model simulation lithium battery, performing 3D simulation on the thermal production process of the lithium battery to obtain a temperature changing simulation curve, performing charging and over-charging on the lithium battery, measuring the practical temperature changing curve and the voltage changing curve of the lithium battery in the processes of charging and over-charging, and detecting the safety performance of the over-charging of the lithium battery. The lithium battery safety detection method disclosed by the invention realizes a fast screening method for the lithium battery over-charging safety performance through the ultrasonic signal, charging-discharging detection and combining with the lithium battery charging safety performance detection.

Description

technical field [0001] The invention relates to the technical field of lithium battery detection, in particular to a detection method for lithium battery safety. Background technique [0002] The wide application of lithium batteries has greatly benefited people's daily life, and its safety performance has attracted more and more attention. Most of the currently commercialized lithium batteries use flammable organic electrolytes, which are potentially dangerous, such as: flammability, flammability, and explosiveness. In design or manufacturing, if there are some potential structural defects, it may cause serious safety accidents. Even a small mobile phone battery may cause fire or even explode. For electric vehicles that use lithium batteries as power sources, safety issues are more urgent. Pay attention to. However, in recent years, the relevant inspection methods for the safety performance of lithium batteries have remained almost unchanged, and the problem of "undetecta...

AI Technical Summary

Problems solved by technology

In design or manufacturing, if there are some potential structural defects, it may cause serious safety accidents. Even a small mobile phone battery may cause fire or even explode. For electric vehicles that use lithium batteries as power sources, safety issues are more urgent. Pay attention to

However, in recent years, the test methods related to the safety performance of lithium batteries have remained almost unchanged, and the problem of "undetectable, inaccurate, and fast" is particularly prominent in the field of lithium battery safety performance testing.