A lithium ion power battery with thermal runaway control function

Abstract

The invention discloses a lithium ion power battery with heat runaway control function, comprising a hollow battery case (3), wherein a battery core pack (4) is arranged in the battery case (3); A left end and a right end of that top of the battery core pack (4) are respectively provided with a positive terminal (1) and a negative terminal (6); The outer surface of the battery core pack (4) is provided with a thermal runaway blocking device (2). The thermal runaway blocking device (2) is respectively connected with a positive terminal (1) and a negative terminal (6); Said thermal runaway blocking means (2) being in contact with the battery case (3) for transferring heat on the battery case (3) and causing a short circuit of the battery to occur outside the battery pack (4) when the temperature thereon rises to a preset temperature value. The invention is safe and reliable, can effectively avoid internal short circuit of the lithium ion power battery, prevents the safety accident of thelithium ion power battery due to the internal short circuit, and guarantees the safety performance of the battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion power battery with thermal runaway control function. Background technique [0002] At present, lithium-ion batteries have the advantages of high specific energy and long cycle life. They are not only widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, but also widely used in electric vehicles, electric bicycles and electric tools. In terms of medium-sized electric equipment, the safety performance requirements of lithium-ion batteries are getting higher and higher. [0003] As an energy-saving and environment-friendly means of transportation, new energy vehicles have gradually become a strategic planning industry for governments of various countries. The safety issues in the promotion and application of new energy vehicles not only involve the safety of people's lives and property, but also affect the sustainabl...

AI Technical Summary

Problems solved by technology

[0004] The heat transfer in the process of thermal runaway is mainly heat conduction. At present, due to the thick wall of the plastic case power lithium-ion battery, the thermal conductivity is poor, and the heat cannot be dissipated well, which leads to the temperature rise of the battery, the melting of the diaphragm, and the direct contact between the positive and negative electrodes, causing Large-scale internal short circuit, final combustion, or even explosion, the safety performance of the battery cannot be guaranteed

[0005] For the existing technology, most of them are provided with a heat insulation layer between adjacent batteries, which can temporarily delay the triggering of thermal runaway, but it cannot prevent the heat transfer. When the temperature inside the battery rises to a certain level, it will still cause a large Large-scale internal short circuit eventually leads to battery burning and even battery explosion safety accidents, failing to fundamentally solve the problem of battery thermal runaway

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