Vehicle-mounted lithium ion battery pack grading type fire extinguishing system and control strategy thereof

Abstract

The invention provides a vehicle-mounted lithium ion battery pack grading type fire extinguishing system and a control strategy thereof. The vehicle-mounted lithium ion battery pack grading type fireextinguishing system is composed of a fire parameter monitoring module, a fire extinguishing agent storage module and a fire extinguishing agent spraying module. A detection module monitors various parameters of power batteries during thermal runaway and fire through a plurality of sensors, and analyzes and evaluates the firing degree of the batteries by the BMS. According to a preset extinguishing agent spraying strategy, aiming at the fire characteristics of the batteries, the fire position can be quickly identified, and different extinguishing agent combination modes and spraying modes areselected for the power battery modules with different fire degrees so that the limited vehicle-mounted fire extinguishing agent can play a fire extinguishing role to the largest extent, the fire extinguishing effect is improved, and great guarantee is provided for personal property safety in the use process of an electric automobile.

Description

technical field [0001] The present invention carries out the related design of the fire extinguishing system aiming at the fire phenomenon of the power lithium-ion battery, specifically a vehicle-mounted lithium-ion battery pack graded fire extinguishing system and its control strategy. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, long cycle life, low environmental pollution, and no memory. They have shown broad application prospects in electric vehicles, aerospace, submarines and other power fields. However, the frequent occurrence of electric vehicle fires and explosion accidents not only threatens people's lives and properties, but also limits the development and promotion of electric vehicles. [0003] The fire of the power battery is mainly caused by the defects of its own design and materials used, the local individual electric heat abuse and mechanical abuse during the working process, such as: in...

AI Technical Summary

Problems solved by technology

If the battery that caught fire cannot be controlled and dealt with in time, the flame will spread to the entire battery pack very quickly, causing the entire vehicle to catch fire, and the fire at this time will not be controlled

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