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Due to the rapid development of new energy vehicles, the power lithium-ion battery industry has also received much attention. Power lithium-ion batteries refer to batteries that provide power to electric vehicles, electric trains, electric bicycles, and golf carts.

The first National Lithium ion Battery Safety Technology Seminar hosted by Tsinghua University was held in Beijing. This meeting revolves around the issue of thermal runaway of power lithium-ion batteries (mainly at high temperatures), discussing various factors that affect battery safety, as well as how to further improve the technical means and measures of lithium-ion battery safety. Professor Ouyang Minggao from Tsinghua University analyzed three causes of thermal runaway in power lithium-ion batteries at the meeting and proposed some solutions and suggestions for this.

Heat induced factor

Generally speaking, the so-called thermal inducement is the external high-temperature environment, including external fires, poor battery heat dissipation, etc. Under external high temperatures, due to the structural characteristics of lithium-ion batteries, SEI membranes, electrolytes, etc. will undergo analytical reactions. The analytes of the electrolyte will also react with the positive and negative electrodes, and the cell membrane will melt for analysis. Multiple reactions will result in the occurrence of a large amount of heat. The melting of the diaphragm leads to an internal short circuit, and the release of electrical energy increases the processing of heat. The cumulative and mutually reinforcing destructive effects result in the rupture of the explosion-proof film of the battery cell, the ejection of electrolyte, and the occurrence of combustion and fire.

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