High specific energy battery pack internal flame-retardant cooling method

Abstract

The present invention relates to the technical field of secondary battery pack manufacturing, and provides a high specific energy battery pack internal flame-retardant cooling method. According to the method, a flame retardant agent is subjected to a microencapsulation treatment and the treated flame retardant agent is filled inside the battery pack, such that the problem that the sharp temperature change caused by the electrical core short circuit and other failures causes firing burning even explosion can be solved. According to the present invention, the method has the following effects that after the temperature in the battery pack is increased to a certain value, the shell of the microcapsule filled with the flame retardant agent is rapidly dissolved or broken to release the flame retardant agent, and oxygen is consumed or diluted through the physical pathway of the isolation film forming on the local high-temperature area and the surrounding in the battery pack and the chemical pathway of the free radical terminating so as to achieve the functions of flame retardant effect and cooling, terminate the spreading of the high temperature area, eliminate and reduce the firing risk, and improve the safety performance of the battery pack; and the method has advantages of high safety and high reliability, and with the microcapsule flame retardant agent, the installation of the larger fire extinguishing device is avoided, and the advantages of lightweight and environmental protection are provided.

Description

technical field [0001] The invention relates to a method for flame retardant cooling and fire extinguishing inside a battery pack, which belongs to the technical field of manufacturing lithium ion secondary battery packs. Background technique [0002] With the development of my country's strategic emerging industries and the decision-making and deployment of energy-saving and emission-reduction work, the government attaches great importance to the cultivation and development of energy-saving and new energy vehicle industries. As a green and environmentally friendly vehicle, electric vehicles will become a future development trend. Compared with traditional lead-acid, nickel-cadmium, and nickel-hydrogen secondary batteries, polymer lithium-ion secondary batteries are environmentally friendly, have high operating voltage, long cycle life, and small self-discharge, and are environmentally friendly. The concept of automotive energy has received great attention and is being incre...

AI Technical Summary

Problems solved by technology

During the use of existing battery packs for electric vehicles, there is a large temperature difference between the inside and outside, and there is a certain temperature gradient, which will have different effects on the performance of the battery

Although the existing battery packs for electric vehicles are equipped with a battery management system to manage the temperature, for the "thermal runaway" of the battery pack in extreme cases, the power supply is only passively cut off, and the "thermal runaway" caused by "thermal runaway" cannot be actively controlled. "caused combustion and explosion

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