Thermal runaway simulation method based on needle-punched internal short-circuit lithium ion battery

Abstract

The invention discloses a thermal runaway simulation method based on a needle-punched internal short-circuit lithium ion battery. Based on an electrochemical reaction mechanism and a heat production characteristic principle of a battery, the thermal runaway simulation method carries out thermoelectric characteristic test and modeling simulation calculation on the lithium ion battery, researches the battery temperature change characteristics under the charging condition, analyzes the short-circuit internal resistance under the condition of needling short circuit so as to establish a thermal runaway acupuncture short-circuit model according to the temperature change characteristics of the battery under the charging condition, so that the problems that an existing acupuncture lithium ion battery overcharge thermal runaway simulation research method lacks comprehensive analysis on an electrochemical reaction mechanism and heat production characteristics, and the specificity of different battery monomers is not considered and the like are solved. Compared with the existing needle-punched lithium ion battery overcharge thermal runaway simulation research method, the thermal runaway simulation method based on a needle-punched internal short-circuit lithium ion battery can more effectively analyze and predict the thermal behavior of the battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a thermal runaway simulation method based on needling internal short-circuit lithium-ion batteries. Background technique [0002] With the development of electronic technology, more and more electronic products use lithium batteries as sustainable energy storage devices. At the same time, lithium battery safety accidents frequently occur due to improper operation, especially overcharging. While lithium-ion batteries have high performance advantages and high growth, they are also prone to thermal safety accidents due to their high energy density. More and more thermal safety accidents of electric vehicles are caused by the internal damage of the battery, which leads to fire and explosion caused by leakage. Usually, the battery is produced in a series of processes such as production and assembly due to lax operation or limited technology. Defective leaking batteries, these unqualified bat...

AI Technical Summary

Problems solved by technology

While lithium-ion batteries have high performance advantages and high growth, they are also prone to thermal safety accidents due to their high energy density

More and more thermal safety accidents of electric vehicles are caused by the internal damage of the battery, which leads to fire and explosion caused by leakage. Usually, the battery is produced in a series of processes such as production and assembly due to lax operation or limited technology. Defective leaking batteries, these unqualified batteries have defects between the positive and negative electrodes inside, or there is no insulation treatment between the positive and negative current collectors

In special cases, the battery is subjected to external forces such as impact, penetration, extrusion, and impact, causing an internal short circuit in the battery, causing thermal runaway of the battery, and causing a safety accident.

[0003] The internal short circuit of the battery is one of the main reasons for the thermal runaway of lithium batteries. The existing simulation research methods are not comprehensive enough, and there are many defects, especially the lack of comprehensive analysis of the electrochemical reaction mechanism and heat generation characteristics, and The specificity of different battery cells is not considered

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