Pyroelectric detection method and device for over-charged safety performance of lithium ion battery

Abstract

The invention discloses a pyroelectric detection method for the over-charged safety performance of a lithium ion battery. The method comprises the steps of building a charge conversation model, a mass conservation model and an electrochemical reaction model of the lithium ion battery; simulating the electrical property and electrochemical performance of the electrochemical performance; acquiring a temperature variation simulation curve by simulating the heat production process of the lithium ion battery; charging and over-charging the lithium ion battery, and measuring a practical temperature change curve and a voltage change curve of the lithium ion battery; setting temperature and voltage threshold values, comparing the temperature change curve with the temperature threshold and a temperature change simulation curve, comparing the voltage change curve with the voltage threshold, and detecting the over-charge safety performance of the lithium ion battery. According to the pyroelectric detection method, by contacting the heating effect with electrochemical performance of the lithium ion battery, the rapid pyroelectric detection method for the over-charged safety performance of the lithium ion battery can be provided. The invention further discloses a pyroelectric detection device for the over-charged safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to performance detection of lithium-ion batteries, in particular to a pyroelectric detection method and device for the overcharge safety performance of lithium-ion batteries. Background technique [0002] The wide application of lithium-ion batteries has greatly benefited people's daily life, and its safety performance has attracted more and more attention. Most of the currently commercialized lithium-ion batteries use flammable organic electrolytes, which have potential hazards, such as: flammability, flammability, and explosiveness. In the design or manufacture, 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-ion batteries as power sources, safety issues are even more serious. need attention. However, in recent years, the relevant testing methods for the safety performance of lithium-i...

AI Technical Summary

Problems solved by technology

Since the temperature difference between different positions of the battery can reach more than 20K during the test, the single-point temperature measurement using a thermocouple may cause deviations in the results due to the difference in the location of the points, which is not conducive to the detection of potentially dangerous lithium-ion batteries.

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