Battery thermal runaway explosion hazard assessment method

Abstract

The embodiment of the invention relates to a battery thermal runaway explosion hazard assessment method. According to the embodiment of the invention, the battery monomers are placed in the closed container; thermal runaway triggering is conducted on the battery monomers; after the thermal runaway of the battery monomeris finished, the type and component proportion of the combustible gas in the closed container are tested; combustible mixed gas with equal types and equal component proportions is prepared according to the types and the component proportions of the combustible gas; the combustible mixed gas is filled into the battery system to be tested until the specific percentage of the opening pressure of the explosion-proof valve of the battery system to be tested is reached; the combustible mixed gas in the battery system is ignited; and the explosion shock wave pressure of the combustible mixed gas is tested. According to the embodiment of the invention, an explosion scene under an open fire ignition condition after a large amount of combustible gas is gathered due to thermal runaway of the battery in the battery system can be quickly and accurately simulated, and manual accurate control of the explosion moment can be realized, so that safe and controllable testing of the explosion intensity and secondary disasters of the battery system is realized.

Description

technical field [0001] The invention relates to the technical field of power batteries, and in particular, the invention relates to a method for evaluating the explosion hazard of a battery thermal runaway. Background technique [0002] With the intensification of the global shortage of non-renewable energy, environmental pollution, and greenhouse effect, the development of new energy vehicles has received more and more attention, and it has officially entered the stage of large-scale popularization and application from the promotion and application stage. In 2019 and 2020, the sales of new energy vehicles in my country will reach 1.206 million and 1.3 million respectively, ranking first in the world for five consecutive years. [0003] Lithium-ion batteries are currently the most important power source for electric vehicles due to their high energy density, long cycle life, and low self-discharge rate. However, with the increase in the number of electric vehicles, there ha...

AI Technical Summary

Problems solved by technology

At the same time, the market demand for long driving range of electric vehicles has put forward higher requirements for the performance of the power batteries used in them, especially the increasing demand for battery energy density, which has led to the current liquid electrolyte power Batteries are increasingly at risk

[0004] For electric vehicles, the safety accidents of power battery systems usually smoke, catch fire and explode, especially when an explosion occurs, it will cause huge damage to the surrounding environment and cause serious personal injury

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